/* ==========================================================================
   CONVERTMASTER PRO — MASTER STYLESHEET (style.css)
   Production-Ready SaaS UI Engine
   Apple + Google Material 3 + Stripe + Notion + Linear + Glassmorphism
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Reset & Base Defaults
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: auto;
  text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

html.cm-ready {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}

img, svg, picture, video {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
  user-select: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* Accessible focus outline */
:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-surface-subtle);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary-300);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-surface-subtle);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-500);
}

/* --------------------------------------------------------------------------
   2. Layout Primitives & Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.section-spacing {
  padding-top: clamp(0.75rem, 1.6vw, 1.25rem);
  padding-bottom: clamp(0.75rem, 1.6vw, 1.25rem);
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto clamp(0.75rem, 1.5vw, 1.25rem);
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  border: 1px solid var(--color-primary-200);
  margin-bottom: 1rem;
  transition: all var(--transition-normal);
}

[data-theme="dark"] .section-badge {
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-primary-300);
  border-color: rgba(59, 130, 246, 0.25);
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.6;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-secondary-500) 50%, var(--color-accent-500) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Button Component System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.45);
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--glass-bg-hover);
  border-color: var(--card-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent-500) 0%, #ea580c 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(245, 158, 11, 0.45);
}

.btn-icon-only {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--text-base);
}

/* Glass Card Primitive (Rounded 24px) */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-24);
  box-shadow: var(--shadow-24card);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-normal);
}

/* Scroll Progress Bar */
.scroll-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 1100;
  background: transparent;
}

.scroll-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-secondary-500), var(--color-accent-500));
  transition: width 80ms ease-out;
}

/* --------------------------------------------------------------------------
   3. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), backdrop-filter var(--transition-normal), box-shadow var(--transition-normal);
}

.site-header.is-scrolled {
  background: var(--header-bg);
  border-bottom-color: var(--header-border);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: clamp(0.5rem, 1.2vw, 1.5rem);
  overflow: visible !important;
}

/* Logo */
.brand-logo {
  display: inline-flex !important;
  align-items: center !important;
  gap: 0.75rem !important;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  flex-shrink: 0 !important;
  white-space: nowrap !important;
}

.logo-icon-wrap {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-secondary-500) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.brand-pro-tag {
  font-size: 0.625rem;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  background: linear-gradient(135deg, #f59e0b, #ea580c);
  color: #ffffff;
  font-weight: 700;
  text-transform: uppercase;
  margin-left: 0.25rem;
  vertical-align: middle;
}

/* Desktop Navigation */
.desktop-nav {
  display: flex !important;
  align-items: center !important;
  gap: clamp(0.4rem, 0.8vw, 1rem) !important;
  flex-shrink: 1 !important;
  min-width: 0 !important;
  margin-left: 1rem !important;
  margin-right: auto !important;
}

.nav-link {
  font-size: clamp(0.75rem, 0.84vw, 0.875rem);
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 0.5rem 0.15rem;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-link:hover, .nav-link.is-active {
  color: var(--color-primary-600);
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link.is-active {
  color: var(--color-primary-400);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--color-primary-500);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.nav-link:hover::after, .nav-link.is-active::after {
  width: 100%;
}

/* Desktop Mega Menu Dropdown */
.mega-menu-trigger {
  position: relative;
}

.mega-menu-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  width: min(920px, 92vw);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-24);
  box-shadow: var(--shadow-xl);
  padding: 2rem;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  z-index: 1050;
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
}

.mega-menu-trigger:hover .mega-menu-dropdown,
.mega-menu-dropdown:hover {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
  transform: translateX(-50%) translateY(8px);
}

.mega-menu-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.mega-column-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-600);
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color-subtle);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

[data-theme="dark"] .mega-column-title {
  color: var(--color-primary-400);
}

.mega-column-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mega-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.45rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.mega-item:hover {
  background: var(--bg-surface-subtle);
  color: var(--color-primary-600);
  transform: translateX(4px);
}

[data-theme="dark"] .mega-item:hover {
  color: var(--color-primary-400);
}

.mega-item-icon {
  width: 18px;
  height: 18px;
  opacity: 0.75;
}

/* Header Action Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: clamp(0.4rem, 0.75vw, 0.75rem);
  flex-shrink: 0 !important;
  margin-left: auto;
}

.search-trigger-pill {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: var(--text-sm);
  transition: all var(--transition-normal);
  flex-shrink: 0;
}

.search-trigger-pill:hover {
  border-color: var(--color-primary-400);
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.kbd-shortcut {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.action-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
  position: relative;
  flex-shrink: 0;
}

.action-btn:hover {
  color: var(--color-primary-600);
  border-color: var(--color-primary-400);
  background: var(--bg-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .action-btn:hover {
  color: var(--color-primary-400);
}

.favorites-counter-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: var(--color-danger-500);
  color: #ffffff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.4);
}

/* Language Selector Dropdown */
.lang-dropdown-wrap {
  position: relative;
  flex-shrink: 0 !important;
  z-index: 1050;
}

.action-btn.lang-dropdown-trigger {
  width: auto !important;
  min-width: 58px;
  padding: 0 10px !important;
  gap: 4px;
  cursor: pointer;
  flex-shrink: 0 !important;
}

.lang-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  min-width: 185px;
  max-height: 380px;
  overflow-y: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.18), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 1100;
}

.lang-dropdown-menu.is-open {
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
  transform: translateY(0) !important;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.lang-option:hover,
.lang-option:focus-visible,
.lang-option.is-active {
  background: var(--bg-surface-subtle);
  color: var(--color-primary-600);
  font-weight: 600;
  outline: none;
}

/* Mobile Hamburger Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.mobile-menu-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1380px) {
  .desktop-nav .nav-link-secondary {
    display: none !important;
  }
  .search-trigger-pill .kbd-shortcut {
    display: none !important;
  }
}

@media (max-width: 1220px) {
  .desktop-nav {
    display: none !important;
  }

  .mobile-menu-toggle {
    display: flex !important;
  }
}

@media (max-width: 768px) {
  .search-trigger-pill {
    width: 38px !important;
    height: 38px !important;
    padding: 0 !important;
    justify-content: center !important;
  }

  .search-trigger-pill span,
  .search-trigger-pill .kbd-shortcut {
    display: none !important;
  }

  .header-actions {
    gap: 0.4rem !important;
  }

  .brand-logo {
    font-size: 1.15rem !important;
  }

  .logo-icon-wrap {
    width: 34px !important;
    height: 34px !important;
  }
}

@media (max-width: 420px) {
  .header-actions a[href="#favoritesSection"] {
    display: none !important;
  }
}

/* --------------------------------------------------------------------------
   4. Mobile Slide-in Drawer
   -------------------------------------------------------------------------- */
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1200;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
}

.mobile-drawer-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(380px, 86vw);
  height: 100%;
  background: var(--drawer-bg);
  border-left: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  z-index: 1250;
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  overflow-y: auto;
}

.mobile-drawer.is-open {
  transform: translateX(0);
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color-subtle);
  margin-bottom: 1.5rem;
}

.mobile-drawer-close {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.mobile-drawer-search {
  margin-bottom: 1.5rem;
}

.drawer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.drawer-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-surface-subtle);
  transition: background var(--transition-fast);
}

.drawer-nav-item:hover,
.drawer-nav-item.is-active {
  background: var(--color-primary-50);
  color: var(--color-primary-600);
}

[data-theme="dark"] .drawer-nav-item:hover,
[data-theme="dark"] .drawer-nav-item.is-active {
  background: rgba(59, 130, 246, 0.2);
  color: var(--color-primary-300);
  border-left: 3px solid var(--color-primary-500);
}

.drawer-footer-actions {
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color-subtle);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* --------------------------------------------------------------------------
   5. Hero Section & Live Unit Converter
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  padding-top: calc(var(--header-height) + 1.25rem);
  padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
  overflow: hidden;
}

/* Background floating mesh orbs */
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  pointer-events: none;
  z-index: -1;
  opacity: 0.85;
}

.hero-orb-1 {
  width: clamp(280px, 40vw, 550px);
  height: clamp(280px, 40vw, 550px);
  top: -80px;
  right: -50px;
  background: radial-gradient(circle, var(--color-primary-500) 0%, transparent 70%);
}

.hero-orb-2 {
  width: clamp(250px, 35vw, 480px);
  height: clamp(250px, 35vw, 480px);
  bottom: 50px;
  left: -80px;
  background: radial-gradient(circle, var(--color-secondary-400) 0%, transparent 70%);
}

.hero-orb-3 {
  width: clamp(180px, 25vw, 360px);
  height: clamp(180px, 25vw, 360px);
  top: 40%;
  right: 25%;
  background: radial-gradient(circle, var(--color-accent-400) 0%, transparent 70%);
  opacity: 0.5;
}

/* Compact Hero Header (Immediate visual clarity) */
.hero-header-compact {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 1.25rem;
  padding-top: 0.25rem;
}

.hero-headline-compact {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.35rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.hero-subheadline-compact {
  font-size: clamp(0.85rem, 1.8vw, 1.02rem);
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 600px;
  margin: 0 auto;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto clamp(2rem, 4vw, 3.5rem);
}

.hero-headline {
  font-family: var(--font-heading);
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.hero-subheadline {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 720px;
  margin: 0 auto 2rem;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

/* 2-Column Split Hero Layout (Converter Left, Ad Right) */
.hero-split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 1.5rem;
  align-items: start;
  max-width: 1240px;
  margin: 0 auto;
}

.hero-split-left {
  min-width: 0;
}

.hero-split-left .live-converter-card {
  max-width: 100%;
  margin: 0;
  padding: clamp(1.25rem, 3vw, 1.75rem);
}

.hero-split-right {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
}

.hero-ad-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-20);
  padding: 1.25rem 1rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}

.hero-ad-card .hero-ad-box {
  width: 100%;
  max-width: 300px;
  min-height: 250px;
  margin: 0 auto;
}

.hero-sidebar-trust-box {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

.trust-box-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
  color: var(--color-primary-600);
  margin-bottom: 0.25rem;
}

[data-theme="dark"] .trust-box-header {
  color: var(--color-primary-400);
}

.hero-sidebar-trust-box p {
  margin: 0;
  line-height: 1.4;
  color: var(--text-muted);
}

@media (max-width: 991px) {
  .hero-split-grid {
    grid-template-columns: 1fr;
  }

  .hero-split-right {
    position: static;
    max-width: 340px;
    margin: 1.5rem auto 0;
  }
}

/* Master Live Converter Card (Rounded 24px) */
.live-converter-card {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  position: relative;
  border-radius: var(--radius-24);
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  box-shadow: var(--shadow-24card);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* Category Tabs inside Live Converter */
.converter-category-tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.85rem;
  margin-bottom: 1.25rem;
  scrollbar-width: thin;
  scroll-behavior: smooth;
}

.converter-category-tabs::-webkit-scrollbar {
  height: 5px;
}
.converter-category-tabs::-webkit-scrollbar-track {
  background: #e2e8f0;
  border-radius: var(--radius-full);
}
.converter-category-tabs::-webkit-scrollbar-thumb {
  background: #94a3b8;
  border-radius: var(--radius-full);
}

[data-theme="dark"] .converter-category-tabs::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.06);
}
[data-theme="dark"] .converter-category-tabs::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
}

.category-tab-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
  padding: 0.5rem 1.05rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  color: #334155;
  background: #f1f5f9;
  border: 1.5px solid #cbd5e1;
  white-space: nowrap;
  transition: all var(--transition-fast);
  cursor: pointer;
}

[data-theme="dark"] .category-tab-btn {
  color: var(--text-secondary);
  background: rgba(30, 41, 59, 0.7);
  border-color: rgba(255, 255, 255, 0.12);
}

.category-tab-btn:hover {
  color: var(--color-primary-600);
  border-color: var(--color-primary-400);
  background: #ffffff;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.08);
}

[data-theme="dark"] .category-tab-btn:hover {
  background: rgba(30, 41, 59, 0.95);
  border-color: var(--color-primary-400);
}

.category-tab-btn.is-active {
  background: var(--color-primary-600) !important;
  color: #ffffff !important;
  border-color: var(--color-primary-600) !important;
  box-shadow: 0 4px 14px var(--color-primary-glow);
}

/* Dynamic Active Category Header Bar */
.converter-active-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0.85rem;
  margin-bottom: 1.35rem;
  background: var(--color-primary-50);
  border: 1px solid rgba(79, 70, 229, 0.18);
  border-radius: var(--radius-lg);
}

[data-theme="dark"] .converter-active-header {
  background: rgba(79, 70, 229, 0.12);
  border-color: rgba(79, 70, 229, 0.3);
}

.converter-active-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: var(--text-sm);
  color: var(--color-primary-700);
  letter-spacing: -0.01em;
}

[data-theme="dark"] .converter-active-badge {
  color: #c7d2fe;
}

.active-cat-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.converter-mode-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.converter-mode-tag .live-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 12px #10b981; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* Live Converter Interactive Grid */
.converter-body-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

.unit-input-box {
  background: #f8fafc;
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
}

.unit-input-box.unit-output-box {
  background: #f8faff;
  border-color: #c7d2fe;
}

[data-theme="dark"] .unit-input-box {
  background: rgba(30, 41, 59, 0.65);
  border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .unit-input-box.unit-output-box {
  background: rgba(30, 41, 59, 0.8);
  border-color: rgba(79, 70, 229, 0.35);
}

.unit-input-box:focus-within {
  background: #ffffff;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 4px var(--color-primary-glow), 0 8px 20px -4px rgba(15, 23, 42, 0.08);
}

[data-theme="dark"] .unit-input-box:focus-within {
  background: rgba(30, 41, 59, 0.95);
  border-color: var(--color-primary-400);
}

.unit-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.unit-box-label {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #475569;
}

[data-theme="dark"] .unit-box-label {
  color: var(--text-muted);
}

.unit-select-custom {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-md);
  background-color: #ffffff;
  border: 1.5px solid #cbd5e1;
  font-weight: 700;
  font-size: var(--text-sm);
  color: #0f172a;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23475569' viewBox='0 0 24 24'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2.5rem;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
  transition: all var(--transition-fast);
}

[data-theme="dark"] .unit-select-custom {
  background-color: #1e293b;
  border-color: rgba(255, 255, 255, 0.15);
  color: #f1f5f9;
}

.unit-select-custom:hover {
  border-color: var(--color-primary-400);
}

.unit-select-custom:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.unit-value-input {
  font-family: var(--font-mono);
  font-size: clamp(1.65rem, 3.2vw, 2.35rem);
  font-weight: 800;
  color: #0f172a;
  width: 100%;
  padding: 0.45rem 0.75rem;
  background: #ffffff;
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04);
  transition: all var(--transition-fast);
}

[data-theme="dark"] .unit-value-input {
  background: #0f172a;
  border-color: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.unit-value-input:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
  outline: none;
}

.unit-value-output {
  font-family: var(--font-mono);
  font-size: clamp(1.65rem, 3.2vw, 2.35rem);
  font-weight: 800;
  color: var(--color-primary-600);
  word-break: break-all;
  min-height: 52px;
  display: flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  background: #ffffff;
  border: 1.5px solid #c7d2fe;
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 2px rgba(79, 70, 229, 0.05);
}

[data-theme="dark"] .unit-value-output {
  color: var(--color-primary-400);
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(79, 70, 229, 0.35);
}

/* Swap Button */
.converter-swap-btn {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: #ffffff;
  border: 2px solid #cbd5e1;
  color: var(--color-primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
  transition: all var(--transition-normal);
  z-index: 2;
}

[data-theme="dark"] .converter-swap-btn {
  background: #1e293b;
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--color-primary-400);
}

.converter-swap-btn:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary-500);
  transform: scale(1.12) rotate(180deg);
  box-shadow: 0 6px 18px var(--color-primary-glow);
}

[data-theme="dark"] .converter-swap-btn:hover {
  background: rgba(79, 70, 229, 0.2);
}

/* Converter Footer Toolbar */
.converter-footer-toolbar {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1.5px solid var(--border-color-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.conversion-formula-pill {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: #312e81;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  background: #eef2ff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: 1.5px solid #c7d2fe;
}

.conversion-formula-pill svg {
  color: var(--color-primary-600);
  flex-shrink: 0;
}

[data-theme="dark"] .conversion-formula-pill {
  background: rgba(79, 70, 229, 0.15);
  border-color: rgba(79, 70, 229, 0.35);
  color: #c7d2fe;
}

.converter-action-btns {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.converter-action-btns .action-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: #ffffff;
  border: 1.5px solid #cbd5e1;
  color: #334155;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
}

[data-theme="dark"] .converter-action-btns .action-btn {
  background: #1e293b;
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-secondary);
}

.converter-action-btns .action-btn:hover {
  border-color: var(--color-primary-500);
  color: var(--color-primary-600);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(15, 23, 42, 0.1);
}

@media (max-width: 768px) {
  .hero-split-left .live-converter-card,
  .live-converter-card {
    padding: 1.15rem 0.85rem !important;
    border-radius: var(--radius-16) !important;
  }

  .converter-active-header {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 0.5rem !important;
    margin-bottom: 1rem !important;
    padding-bottom: 0.75rem !important;
  }

  .converter-body-grid {
    grid-template-columns: 1fr !important;
    gap: 0.65rem !important;
  }

  .unit-input-box {
    width: 100% !important;
    min-width: 0 !important;
    padding: 1rem 0.85rem !important;
    border-radius: var(--radius-lg) !important;
    gap: 0.65rem !important;
  }

  .unit-value-input,
  .unit-value-output {
    font-size: clamp(1.4rem, 5vw, 1.85rem) !important;
    width: 100% !important;
    min-width: 0 !important;
    min-height: 48px !important;
    word-break: break-all !important;
  }

  .converter-swap-btn {
    margin: 0.25rem auto !important;
    width: 44px !important;
    height: 44px !important;
    transform: rotate(90deg) !important;
  }

  .converter-swap-btn:hover {
    transform: scale(1.1) rotate(270deg) !important;
  }

  .converter-footer-toolbar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.75rem !important;
    margin-top: 1.15rem !important;
    padding-top: 1rem !important;
  }

  .conversion-formula-pill {
    width: 100% !important;
    justify-content: center !important;
    font-size: 0.75rem !important;
    text-align: center !important;
    white-space: normal !important;
    word-break: break-word !important;
    padding: 0.45rem 0.75rem !important;
  }

  .converter-action-btns {
    width: 100% !important;
    justify-content: space-between !important;
  }

  .converter-action-btns #copyResultBtn {
    flex: 1 !important;
    justify-content: center !important;
  }
}

/* Popular Conversion Chips */
.hero-popular-chips {
  margin-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.popular-chips-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-right: 0.25rem;
}

.chip-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--chip-bg);
  border: 1px solid var(--border-color);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--chip-text);
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary-400);
  color: var(--color-primary-600);
  transform: translateY(-2px);
}

[data-theme="dark"] .chip-btn:hover {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-300);
}

/* --------------------------------------------------------------------------
   6. Google AdSense Ready Layout Containers
   -------------------------------------------------------------------------- */
.adsense-slot-container {
  width: 100%;
  margin: 1.15rem auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  text-align: center;
}

.adsense-box {
  width: 100%;
  background: var(--ad-bg);
  border: 1.5px dashed var(--ad-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  min-height: 100px;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.adsense-box::before {
  content: 'ADVERTISEMENT';
  position: absolute;
  top: 6px;
  right: 12px;
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--ad-label);
}

.ad-spec-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--ad-label);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.ad-leaderboard {
  max-width: 970px;
  min-height: 90px;
}

.ad-banner {
  max-width: 728px;
  min-height: 90px;
}

.ad-rectangle {
  max-width: 336px;
  min-height: 280px;
}

.ad-responsive {
  max-width: 100%;
  min-height: 120px;
}

/* --------------------------------------------------------------------------
   7. Trending Conversions Strip (Continuous Horizontal Marquee Runner)
   -------------------------------------------------------------------------- */
.trending-strip-section {
  padding: 0.85rem 0;
  border-top: 1px solid var(--border-color-subtle);
  border-bottom: 1px solid var(--border-color-subtle);
  background: var(--bg-surface-subtle);
  overflow: hidden;
  position: relative;
}

.trending-strip-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  max-width: 100%;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.trending-badge-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary-600);
  white-space: nowrap;
  flex-shrink: 0;
  background: var(--bg-surface);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  z-index: 2;
}

[data-theme="dark"] .trending-badge-label {
  color: var(--color-primary-400);
  background: var(--bg-surface-elevated);
}

.trending-shuffle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  margin-left: 2px;
  transition: all var(--transition-fast);
}

.trending-shuffle-btn:hover {
  color: var(--color-primary-600);
  border-color: var(--color-primary-400);
  background: var(--bg-surface);
  transform: rotate(180deg);
}

[data-theme="dark"] .trending-shuffle-btn:hover {
  color: var(--color-primary-400);
}

.trending-marquee-wrapper {
  flex: 1;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent, black 35px, black calc(100% - 35px), transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 35px, black calc(100% - 35px), transparent);
}

.trending-chips-track {
  display: flex;
  align-items: center;
  width: max-content;
  animation: trendingMarqueeRun 35s linear infinite;
  will-change: transform;
}

.trending-marquee-wrapper:hover .trending-chips-track,
.trending-marquee-wrapper:focus-within .trending-chips-track {
  animation-play-state: paused;
}

.trending-chips-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-right: 0.85rem;
  flex-shrink: 0;
}

@keyframes trendingMarqueeRun {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.trending-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.trending-chip:hover {
  border-color: var(--color-primary-400);
  color: var(--color-primary-600);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .trending-chip:hover {
  color: var(--color-primary-300);
  border-color: var(--color-primary-500);
}

/* --------------------------------------------------------------------------
   8. Search Experience Modal & Autocomplete
   -------------------------------------------------------------------------- */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1300;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(1rem, 5vw, 4rem) 1rem 1rem;
}

.search-modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.search-modal-container {
  width: 100%;
  max-width: 680px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-24);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: translateY(-20px) scale(0.96);
  transition: transform var(--transition-normal);
}

.search-modal-backdrop.is-open .search-modal-container {
  transform: translateY(0) scale(1);
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.search-input-field {
  flex: 1;
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-primary);
}

.search-input-field::placeholder {
  color: var(--text-muted);
}

.voice-search-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.voice-search-btn:hover, .voice-search-btn.is-listening {
  color: var(--color-danger-500);
  border-color: var(--color-danger-500);
  background: rgba(239, 68, 68, 0.1);
}

.voice-search-btn.is-listening {
  animation: pulseGlow 1.5s infinite;
}

.search-results-list {
  max-height: 400px;
  overflow-y: auto;
  padding: 0.75rem;
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.search-result-item:hover, .search-result-item.is-selected {
  background: var(--bg-surface-subtle);
  color: var(--color-primary-600);
}

.search-result-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.search-result-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="dark"] .search-result-icon {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-400);
}

.search-result-title {
  font-weight: 600;
}

.search-result-category {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.search-empty-state {
  padding: 3rem 1.5rem;
  text-align: center;
}

.search-empty-illustration {
  width: 72px;
  height: 72px;
  margin: 0 auto 1rem;
  opacity: 0.5;
}

.search-modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1.5rem;
  background: var(--bg-surface-subtle);
  border-top: 1px solid var(--border-color);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.search-footer-shortcuts {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* --------------------------------------------------------------------------
   9. Category Grid (80 Categories Filterable)
   -------------------------------------------------------------------------- */
.category-filter-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.category-filter-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.category-filter-btn:hover {
  border-color: var(--color-primary-400);
  color: var(--color-primary-600);
  transform: translateY(-2px);
}

.category-filter-btn.is-active {
  background: var(--color-primary-600);
  color: #ffffff;
  border-color: var(--color-primary-600);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.category-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0.75rem;
}

@media (max-width: 580px) {
  .category-filter-nav {
    gap: 0.35rem;
    margin-bottom: 1.5rem;
  }

  .category-filter-btn {
    padding: 0.35rem 0.85rem;
    font-size: 0.78rem;
  }

  .category-cards-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.5rem !important;
  }

  .category-card {
    padding: 0.75rem 0.65rem !important;
    min-height: 118px !important;
  }

  .category-card-title {
    font-size: 0.88rem !important;
  }

  .category-card-desc {
    font-size: 0.72rem !important;
    line-height: 1.35 !important;
    display: -webkit-box !important;
    -webkit-line-clamp: 2 !important;
    -webkit-box-orient: vertical !important;
    overflow: hidden !important;
  }
}

.category-card {
  padding: 0.85rem;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-xs);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 130px;
  position: relative;
  transition: all var(--transition-fast);
}

.category-card:hover {
  transform: translateY(-3px);
  border-color: var(--card-border-hover);
  box-shadow: var(--shadow-sm);
}

.category-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.45rem;
}

.category-icon-box {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-secondary-50) 100%);
  color: var(--color-primary-600);
  border: 1px solid var(--color-primary-200);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-bounce);
}

.category-icon-box svg {
  width: 16px;
  height: 16px;
}

[data-theme="dark"] .category-icon-box {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(20, 184, 166, 0.15) 100%);
  color: var(--color-primary-400);
  border-color: rgba(59, 130, 246, 0.3);
}

.category-card:hover .category-icon-box {
  transform: scale(1.1) rotate(5deg);
}

.category-tool-count-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-color-subtle);
}

.category-card-title {
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.category-card-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.35;
  margin-bottom: 0.45rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.category-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.45rem;
  border-top: 1px solid var(--border-color-subtle);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-primary-600);
}

[data-theme="dark"] .category-card-footer {
  color: var(--color-primary-400);
}

.category-arrow-icon {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.category-card:hover .category-arrow-icon {
  transform: translateX(3px);
}

/* Category Expand Toggle Wrapper */
.category-expand-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 1.25rem;
}

/* --------------------------------------------------------------------------
   10. Featured Electrical Section (Cyber Dark Aesthetic)
   -------------------------------------------------------------------------- */
.electrical-section {
  background: var(--electrical-bg);
  color: var(--electrical-text);
  border-top: 1px solid var(--electrical-border);
  border-bottom: 1px solid var(--electrical-border);
  position: relative;
  overflow: hidden;
  transition: background var(--transition-normal), color var(--transition-normal);
}

/* Cyber ambient grid */
.electrical-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(56, 189, 248, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.electrical-header-lightning {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.lightning-bolt-svg {
  width: 32px;
  height: 32px;
  color: var(--electrical-badge-color, var(--color-electric-cyan));
}

.electrical-badge {
  background: var(--electrical-badge-bg);
  color: var(--electrical-badge-color);
  border: 1px solid var(--electrical-badge-border);
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.15);
}

.electrical-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

@media (max-width: 1200px) {
  .electrical-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .electrical-cards-grid {
    grid-template-columns: 1fr;
  }
}

.electrical-card {
  background: var(--electrical-card-bg);
  border: 1px solid var(--electrical-border);
  border-radius: var(--radius-24);
  padding: 1.75rem;
  box-shadow: var(--electrical-card-shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.electrical-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary-500);
  box-shadow: 0 15px 35px rgba(79, 70, 229, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .electrical-card:hover {
  border-color: var(--color-electric-cyan);
  box-shadow: 0 15px 35px rgba(0, 242, 254, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.electrical-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.electrical-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--electrical-badge-bg);
  border: 1px solid var(--electrical-badge-border);
  color: var(--electrical-badge-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.electrical-formula-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--electrical-badge-color);
  background: var(--electrical-badge-bg);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--electrical-badge-border);
}

.electrical-card-title {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--electrical-card-title);
  margin-bottom: 0.5rem;
  line-height: 1.35;
}

.electrical-card-desc {
  font-size: var(--text-sm);
  color: var(--electrical-card-desc);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

/* Interactive Mini Preview inside electrical cards */
.electrical-mini-calc {
  background: var(--electrical-mini-bg);
  border: 1px solid var(--electrical-mini-border);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  margin-bottom: 1.25rem;
}

.mini-calc-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--electrical-mini-text);
  margin-bottom: 0.35rem;
}

.mini-calc-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--electrical-mini-val);
}

/* --------------------------------------------------------------------------
   11. Popular Converters Section
   -------------------------------------------------------------------------- */
.popular-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 1200px) {
  .popular-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .popular-cards-grid {
    grid-template-columns: 1fr;
  }
}

.popular-card {
  padding: 1rem 1.15rem;
  border-radius: var(--radius-16);
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
}

.popular-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--card-border-hover);
}

.popular-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.popular-category-pill {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  letter-spacing: 0.03em;
}

[data-theme="dark"] .popular-category-pill {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-300);
}

.favorite-heart-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color-subtle);
  transition: all var(--transition-fast);
}

.favorite-heart-btn:hover, .favorite-heart-btn.is-active {
  color: var(--color-danger-500);
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  transform: scale(1.08);
}

.popular-card-title {
  font-family: var(--font-heading);
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.popular-card-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.35;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.popular-card-btn {
  width: 100%;
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
  height: auto;
}

/* --------------------------------------------------------------------------
   12. Recently Used & Favorites Sections
   -------------------------------------------------------------------------- */
.recent-favorites-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.history-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.history-section-title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.clear-history-btn {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-danger-500);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(239, 68, 68, 0.08);
  transition: all var(--transition-fast);
}

.clear-history-btn:hover {
  background: rgba(239, 68, 68, 0.18);
}

.history-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.history-card {
  padding: 1.25rem;
  border-radius: var(--radius-xl);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xs);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.history-card:hover {
  border-color: var(--color-primary-400);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.history-card-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.history-card-title {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.history-card-meta {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.empty-history-box {
  padding: 2.5rem;
  text-align: center;
  background: var(--bg-surface-subtle);
  border: 1.5px dashed var(--border-color);
  border-radius: var(--radius-24);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   13. Smart Features Strip (Infinite Marquee)
   -------------------------------------------------------------------------- */
.smart-features-strip {
  padding: 1.75rem 0;
  background: linear-gradient(90deg, var(--color-primary-600) 0%, var(--color-secondary-600) 100%);
  color: #ffffff;
  overflow: hidden;
  position: relative;
}

.marquee-content {
  display: flex;
  align-items: center;
  gap: 3.5rem;
  width: max-content;
  animation: marqueeScroll 28s linear infinite;
}

.marquee-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--text-base);
  font-weight: 700;
  white-space: nowrap;
}

.marquee-icon {
  width: 22px;
  height: 22px;
}

/* --------------------------------------------------------------------------
   14. Why Choose Us Section
   -------------------------------------------------------------------------- */
.why-us-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

.why-card {
  padding: 2.25rem;
  border-radius: var(--radius-24);
  background: var(--glass-bg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  text-align: left;
  transition: all var(--transition-smooth);
}

.why-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary-400);
  box-shadow: var(--shadow-hover);
}

.why-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-secondary-500) 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.why-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.why-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   15. Blog & Conversion Guides Preview
   -------------------------------------------------------------------------- */
.blog-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 1024px) {
  .blog-cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

@media (max-width: 640px) {
  .blog-cards-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.blog-card {
  border-radius: var(--radius-24);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--card-border-hover);
}

.blog-card-img-wrap {
  position: relative;
  width: 100%;
  height: 200px;
  background: var(--bg-surface-subtle);
  overflow: hidden;
}

.blog-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

.blog-card:hover .blog-card-img {
  transform: scale(1.05);
}

.blog-category-tag {
  position: absolute;
  top: 1rem;
  left: 1rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #ffffff;
  font-size: var(--text-xs);
  font-weight: 700;
}

.blog-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.blog-card-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.blog-card-excerpt {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex: 1;
}

.blog-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary-600);
  transition: gap var(--transition-fast);
}

[data-theme="dark"] .blog-read-btn {
  color: var(--color-primary-400);
}

.blog-read-btn:hover {
  gap: 0.75rem;
}

/* --------------------------------------------------------------------------
   16. FAQ Section (Accordion)
   -------------------------------------------------------------------------- */
.faq-accordion-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item.is-active {
  border-color: var(--color-primary-400);
  box-shadow: var(--shadow-sm);
}

.faq-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  transition: color var(--transition-fast);
}

.faq-trigger:hover {
  color: var(--color-primary-600);
}

[data-theme="dark"] .faq-trigger:hover {
  color: var(--color-primary-400);
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
}

.faq-item.is-active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--color-primary-600);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-smooth);
}

.faq-content-inner {
  padding: 0 1.5rem 1.25rem;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   17. Newsletter Section
   -------------------------------------------------------------------------- */
.newsletter-card {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem);
  border-radius: var(--radius-24);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(20, 184, 166, 0.08) 100%), var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.newsletter-form {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 520px;
  margin: 1.75rem auto 0;
}

@media (max-width: 540px) {
  .newsletter-card {
    padding: 1.5rem 1rem !important;
  }

  .newsletter-form {
    flex-direction: column !important;
    width: 100% !important;
    gap: 0.65rem !important;
  }

  .newsletter-input-field,
  .newsletter-form .btn {
    width: 100% !important;
  }
}

.newsletter-input-field {
  flex: 1;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.newsletter-input-field:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.newsletter-success-msg {
  display: none;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-success-500);
  margin-top: 1rem;
}

/* --------------------------------------------------------------------------
   18. Multi-Column Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding-top: clamp(3.5rem, 6vw, 5.5rem);
  padding-bottom: 2rem;
  margin-top: auto;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr repeat(5, 1fr);
  gap: 2.5rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

@media (max-width: 991px) {
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 2rem !important;
  }

  .footer-brand-col {
    grid-column: span 2;
  }
}

@media (max-width: 580px) {
  .footer-top-grid {
    grid-template-columns: 1fr !important;
    gap: 1.75rem !important;
  }

  .footer-brand-col {
    grid-column: span 1;
  }

  .footer-bottom-bar {
    flex-direction: column !important;
    align-items: center !important;
    text-align: center !important;
    gap: 1rem !important;
  }
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-brand-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
}

.footer-social-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.social-icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-icon-btn:hover {
  color: var(--color-primary-600);
  border-color: var(--color-primary-400);
  background: var(--bg-surface);
  transform: translateY(-2px);
}

[data-theme="dark"] .social-icon-btn:hover {
  color: var(--color-primary-400);
}

.footer-col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}

.footer-link:hover {
  color: var(--color-primary-600);
  transform: translateX(3px);
}

[data-theme="dark"] .footer-link:hover {
  color: var(--color-primary-400);
}

.footer-bottom-bar {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-selects-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-select {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   19. Floating Action Buttons (FABs) & Toast Notification
   -------------------------------------------------------------------------- */
.floating-actions-wrap {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  z-index: 990;
}

.fab-btn {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: all var(--transition-normal);
}

.fab-btn:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary-400);
  color: var(--color-primary-600);
}

#scrollToTopFab {
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
}

#scrollToTopFab.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Global Toast Container */
.toast-container {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 2000;
  pointer-events: none;
}

.toast-item {
  padding: 0.75rem 1.25rem;
  background: rgba(15, 23, 42, 0.9);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: fadeUp 250ms ease-out forwards;
}

/* --------------------------------------------------------------------------
   20. Standalone Legal, Editorial & Contact Pages Layout
   -------------------------------------------------------------------------- */
.page-top-spacing {
  padding-top: calc(var(--header-height) + 1.5rem) !important;
}

.legal-page-container {
  padding-top: calc(var(--header-height) + 1.5rem);
  padding-bottom: 3.5rem;
}

.page-hero {
  padding: calc(var(--header-height) + 1.5rem) 0 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero .section-badge {
  margin-bottom: 1rem;
}

.page-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: 1rem;
}

.page-hero-subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.page-hero-meta {
  display: inline-flex;
  align-items: center;
  gap: 1.25rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-surface-subtle);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.page-layout-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  align-items: flex-start;
  margin-bottom: 4rem;
}

@media (max-width: 1024px) {
  .page-layout-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.legal-sidebar {
  position: sticky;
  top: 100px;
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-24);
  padding: 1.5rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
}

.legal-toc-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.legal-toc-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.legal-toc-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: block;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-md);
}

.legal-toc-link:hover, .legal-toc-link.is-active {
  color: var(--color-primary-600);
  background: var(--bg-surface-subtle);
  transform: translateX(4px);
}

[data-theme="dark"] .legal-toc-link:hover, [data-theme="dark"] .legal-toc-link.is-active {
  color: var(--color-primary-400);
}

.legal-content-card {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-24);
  padding: clamp(1.75rem, 5vw, 3.5rem);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  color: var(--text-secondary);
  line-height: 1.75;
}

.legal-article h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color-subtle);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.legal-article h2:first-of-type {
  margin-top: 0;
}

.legal-article h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.legal-article p {
  margin-bottom: 1.25rem;
}

.legal-article ul, .legal-article ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.legal-article li {
  margin-bottom: 0.5rem;
}

.callout-box {
  background: var(--bg-surface-subtle);
  border-left: 4px solid var(--color-primary-500);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  color: var(--text-primary);
  font-size: var(--text-sm);
}

.callout-box.warning-callout {
  border-left-color: #f59e0b;
  background: rgba(245, 158, 11, 0.08);
}

.callout-box.success-callout {
  border-left-color: #10b981;
  background: rgba(16, 185, 129, 0.08);
}

.legal-table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.legal-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  text-align: left;
}

.legal-table th {
  background: var(--bg-surface-subtle);
  padding: 0.75rem 1rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

.legal-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color-subtle);
}

/* Contact Page Grid */
.contact-container-grid {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 2.5rem;
  align-items: flex-start;
  margin-bottom: 4rem;
}

@media (max-width: 900px) {
  .contact-container-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.contact-info-card {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-24);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
}

.contact-item-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.contact-item-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

[data-theme="dark"] .contact-item-icon {
  color: var(--color-primary-400);
  background: rgba(59, 130, 246, 0.15);
}

.contact-form-card {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-24);
  padding: clamp(1.75rem, 5vw, 3rem);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
}

.contact-form-group {
  margin-bottom: 1.25rem;
}

.contact-form-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.contact-form-input, .contact-form-select, .contact-form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-form-input:focus, .contact-form-select:focus, .contact-form-textarea:focus {
  outline: none;
  border-color: var(--color-primary-600);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.contact-form-textarea {
  min-height: 140px;
  resize: vertical;
}

/* --------------------------------------------------------------------------
   Case Converter Tool (#textToolsSection)
   -------------------------------------------------------------------------- */
.case-converter-card {
  max-width: 1100px;
  margin: 0 auto;
}

.case-converter-grid {
  display: grid;
  grid-template-columns: 1fr 180px 1fr;
  gap: 1.25rem;
  align-items: stretch;
}

.case-input-pane, .case-output-pane {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem;
}

.case-pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.case-pane-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.case-textarea {
  flex: 1;
  width: 100%;
  min-height: 220px;
  padding: 0.85rem;
  font-family: var(--font-mono, 'JetBrains Mono', 'SF Mono', Consolas, monospace);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  resize: vertical;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.case-textarea:focus {
  outline: none;
  border-color: var(--color-primary-600);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.case-textarea-readonly {
  background: var(--bg-surface-subtle);
  cursor: default;
}

.case-meta-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 0.65rem;
  padding: 0.25rem 0.25rem 0;
}

.meta-dot {
  opacity: 0.5;
}

.case-actions-pane {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.5rem 0;
}

.case-action-btn {
  width: 100%;
  padding: 0.65rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 600;
  white-space: nowrap;
  justify-content: center;
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.case-action-btn:hover {
  border-color: var(--color-primary-500);
  transform: translateY(-1px);
}

.case-action-btn.is-active {
  background: var(--color-primary-600);
  color: #fff;
  border-color: var(--color-primary-600);
}

.case-footer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (max-width: 991px) {
  .case-converter-grid {
    grid-template-columns: 1fr;
  }
  
  .case-actions-pane {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .case-action-btn {
    flex: 1 1 calc(50% - 0.5rem);
  }
}




/* =============================================================================
   SCIENTIFIC CALCULATOR COMPONENT & MODAL STYLES
   ============================================================================= */

/* 0. Hero Top-Bar Scientific Calculator Launcher (Udatama Gamu) */
.hero-calc-bar {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 0.5rem 1.25rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 auto 1.5rem;
  max-width: 820px;
  cursor: pointer;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  user-select: none;
}

.hero-calc-bar:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary-400);
  box-shadow: 0 8px 24px -4px rgba(59, 130, 246, 0.2);
}

.hero-calc-bar-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.calc-bar-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.calc-bar-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.calc-bar-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hero-calc-bar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

@media (max-width: 768px) {
  .hero-calc-bar {
    flex-direction: column;
    border-radius: var(--radius-16);
    padding: 0.75rem 1rem;
    gap: 0.65rem;
    text-align: center;
  }
  .hero-calc-bar-left {
    flex-direction: column;
    gap: 0.35rem;
  }
  .calc-bar-title-wrap {
    flex-direction: column;
    gap: 0.15rem;
  }
}

/* 1. Hero Split-Right Scientific Calculator Launcher Card */
.hero-calc-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-20);
  padding: 1.15rem 1rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  cursor: pointer;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  margin-bottom: 1rem;
  text-decoration: none;
  user-select: none;
}

.hero-calc-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary-400);
  box-shadow: 0 8px 24px -4px rgba(59, 130, 246, 0.2);
}

.calc-card-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.calc-card-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-primary-600);
  border-radius: var(--radius-full);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

[data-theme="dark"] .calc-card-pill {
  background: rgba(59, 130, 246, 0.2);
  color: var(--color-primary-400);
}

.calc-key-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.calc-key-hint kbd {
  padding: 0.1rem 0.35rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.65rem;
  font-family: inherit;
  font-weight: 600;
}

.calc-card-content {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.calc-logo-badge {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-14);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.18), rgba(99, 102, 241, 0.24));
  border: 1px solid rgba(59, 130, 246, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-500);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.hero-calc-card:hover .calc-logo-badge {
  transform: scale(1.08) rotate(3deg);
  color: var(--color-primary-600);
}

[data-theme="dark"] .calc-logo-badge {
  color: var(--color-primary-400);
}

.calc-card-texts {
  flex: 1;
  min-width: 0;
}

.calc-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.2rem 0;
  line-height: 1.25;
}

.calc-card-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.calc-launch-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-10);
}

/* Card Mode Switcher Tabs */
.calc-card-mode-toggle {
  display: inline-flex;
  align-items: center;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 2px;
  gap: 2px;
}

.calc-card-mode-tab {
  border: none;
  background: transparent;
  padding: 0.15rem 0.55rem;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.calc-card-mode-tab:hover {
  color: var(--text-primary);
}

.calc-card-mode-tab.is-active {
  background: var(--color-primary-500);
  color: #ffffff;
  box-shadow: 0 1px 4px rgba(59, 130, 246, 0.3);
}

[data-theme="dark"] .calc-card-mode-tab.is-active {
  background: var(--color-primary-600);
  color: #ffffff;
}

/* Modal standard normal keypad */
.calc-modal-keypad-normal {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.45rem;
  max-width: 360px;
  margin: 0 auto;
}

/* 2. Scientific Calculator Modal Dialog */
.calc-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1050;
  background: rgba(10, 15, 29, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.calc-modal-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

.calc-modal-dialog {
  width: 100%;
  max-width: 520px;
  max-height: 92vh;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-24);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  transform: scale(0.96) translateY(8px);
  transition: transform var(--transition-normal);
}

.calc-modal-backdrop.is-active .calc-modal-dialog {
  transform: scale(1) translateY(0);
}

/* Modal Header */
.calc-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.calc-modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.calc-modal-logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-10);
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-primary-500);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.calc-modal-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
}

.calc-modal-subtitle {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.3;
}

.calc-modal-header-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.calc-mode-pill-btn {
  padding: 0.25rem 0.6rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-primary-600);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.calc-mode-pill-btn:hover {
  background: var(--color-primary-500);
  color: #ffffff;
  border-color: var(--color-primary-500);
}

.calc-action-icon-btn,
.calc-close-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.calc-action-icon-btn:hover,
.calc-close-btn:hover {
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  border-color: var(--color-primary-400);
}

/* Calculator Screen / LCD Display */
.calc-display-screen {
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-16);
  padding: 0.85rem 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 85px;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

.calc-display-top-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 20px;
}

.calc-badge-indicator {
  padding: 0.1rem 0.35rem;
  background: rgba(59, 130, 246, 0.25);
  color: #60a5fa;
  border-radius: 4px;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  font-family: ui-monospace, monospace;
}

.calc-badge-indicator.memory-ind {
  background: rgba(245, 158, 11, 0.25);
  color: #fbbf24;
}

.calc-expression-line {
  flex: 1;
  text-align: right;
  font-size: 0.82rem;
  color: #94a3b8;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}

.calc-expression-line::-webkit-scrollbar {
  display: none;
}

.calc-result-line {
  font-size: 1.85rem;
  font-weight: 700;
  color: #f8fafc;
  text-align: right;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  letter-spacing: -0.02em;
  line-height: 1.2;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}

.calc-result-line::-webkit-scrollbar {
  display: none;
}

/* 3. Calculator Keypad Grid */
.calc-keypad-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.35rem;
}

.calc-key {
  height: 40px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.08s ease, background-color var(--transition-fast), border-color var(--transition-fast);
  user-select: none;
  font-family: inherit;
}

.calc-key:active {
  transform: scale(0.95);
}

/* Number Keys */
.calc-key.key-num {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-color);
  font-size: 0.95rem;
}

.calc-key.key-num:hover {
  background: var(--bg-surface-subtle);
  border-color: var(--color-primary-400);
}

/* Scientific & Function Keys */
.calc-key.key-sci,
.calc-key.key-func {
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  border-color: var(--border-color);
  font-size: 0.78rem;
}

.calc-key.key-sci:hover,
.calc-key.key-func:hover {
  color: var(--text-primary);
  border-color: var(--color-primary-400);
}

/* Operators (+, -, ×, ÷, ^) */
.calc-key.key-op {
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-primary-600);
  border-color: rgba(59, 130, 246, 0.25);
  font-size: 1.05rem;
}

[data-theme="dark"] .calc-key.key-op {
  background: rgba(59, 130, 246, 0.18);
  color: #60a5fa;
  border-color: rgba(59, 130, 246, 0.35);
}

.calc-key.key-op:hover {
  background: var(--color-primary-500);
  color: #ffffff;
}

/* Clear & Delete Keys */
.calc-key.key-clear {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.25);
  font-size: 0.8rem;
  font-weight: 700;
}

.calc-key.key-clear:hover {
  background: #ef4444;
  color: #ffffff;
}

/* Equals Button (=) */
.calc-key.key-equals {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.calc-key.key-equals:hover {
  filter: brightness(1.1);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.45);
}

/* 4. History Tape Drawer */
.calc-history-drawer {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  max-height: 110px;
  overflow-y: auto;
}

.calc-history-title {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.calc-history-empty {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-style: italic;
}

.calc-history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.25rem 0.35rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: ui-monospace, monospace;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.calc-history-item:hover {
  background: var(--bg-surface-elevated);
}

.calc-hist-expr {
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-hist-res {
  color: var(--color-primary-500);
  font-weight: 700;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .calc-modal-dialog {
    padding: 1rem 0.75rem;
    gap: 0.75rem;
  }

  .calc-key {
    height: 36px;
    font-size: 0.8rem;
  }

  .calc-result-line {
    font-size: 1.5rem;
  }
}


/* =============================================================================
   CASE CONVERTER INTRODUCTORY BANNER (TOP SPOTLIGHT)
   ============================================================================= */

.case-converter-intro-banner,
.spotlight-banner {
  border-radius: var(--radius-20);
  padding: 1.15rem 1.35rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.top-spotlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1rem;
  margin: 1.25rem auto 1.75rem;
  max-width: 1240px;
}

.case-converter-intro-banner,
.spotlight-banner.banner-text {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(59, 130, 246, 0.08));
  border: 1px solid rgba(168, 85, 247, 0.25);
  box-shadow: 0 8px 24px -6px rgba(168, 85, 247, 0.12);
}

.case-converter-intro-banner:hover,
.spotlight-banner.banner-text:hover {
  transform: translateY(-2px);
  border-color: rgba(168, 85, 247, 0.45);
  box-shadow: 0 12px 32px -4px rgba(168, 85, 247, 0.18);
}

.spotlight-banner.banner-health {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(59, 130, 246, 0.08));
  border: 1px solid rgba(16, 185, 129, 0.3);
  box-shadow: 0 8px 24px -6px rgba(16, 185, 129, 0.12);
}

.spotlight-banner.banner-health:hover {
  transform: translateY(-2px);
  border-color: rgba(16, 185, 129, 0.5);
  box-shadow: 0 12px 32px -4px rgba(16, 185, 129, 0.2);
}

.intro-banner-left {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  flex: 1;
  min-width: 0;
}

.intro-banner-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  width: fit-content;
}

.badge-text, .intro-banner-badge:not(.badge-health) {
  background: rgba(168, 85, 247, 0.15);
  color: #a855f7;
}

[data-theme="dark"] .badge-text,
[data-theme="dark"] .intro-banner-badge:not(.badge-health) {
  background: rgba(168, 85, 247, 0.25);
  color: #c084fc;
}

.badge-health {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
}

[data-theme="dark"] .badge-health {
  background: rgba(16, 185, 129, 0.25);
  color: #34d399;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  animation: pulse 1.8s infinite;
}

.dot-text, .pulse-dot:not(.dot-health) {
  background: #a855f7;
  box-shadow: 0 0 8px #a855f7;
}

.dot-health {
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.intro-banner-content {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.intro-banner-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-12);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.icon-text, .intro-banner-icon:not(.icon-health) {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(99, 102, 241, 0.2));
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: #a855f7;
}

[data-theme="dark"] .icon-text,
[data-theme="dark"] .intro-banner-icon:not(.icon-health) {
  color: #c084fc;
}

.icon-health {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.2));
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #059669;
}

[data-theme="dark"] .icon-health {
  color: #34d399;
}

.intro-banner-details {
  flex: 1;
}

.intro-banner-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.25rem 0;
  line-height: 1.3;
}

.intro-banner-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.45;
}

.intro-banner-desc strong {
  color: var(--text-primary);
}

.intro-banner-right {
  flex-shrink: 0;
}

.intro-banner-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.15rem;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: var(--radius-full);
  color: #ffffff;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-text, .intro-banner-btn:not(.btn-health) {
  background: linear-gradient(135deg, #8b5cf6, var(--color-primary-600));
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.35);
}

.btn-text:hover, .intro-banner-btn:not(.btn-health):hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.45);
  filter: brightness(1.08);
}

.btn-health {
  background: linear-gradient(135deg, #10b981, #0284c7) !important;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35) !important;
}

.btn-health:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45) !important;
  filter: brightness(1.08);
}

/* Nav Badge Pill for New Tools */
.nav-badge-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.12rem 0.45rem;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #ec4899, #8b5cf6);
  color: #ffffff;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-left: 0.35rem;
  vertical-align: middle;
  line-height: 1;
}

.nav-link-highlight:hover .nav-badge-pill {
  filter: brightness(1.15);
}

@media (max-width: 900px) {
  .top-spotlights-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .spotlight-banner,
  .case-converter-intro-banner {
    flex-direction: column !important;
    align-items: stretch !important;
    padding: 1.15rem 1rem !important;
    gap: 1rem !important;
  }

  .spotlight-banner .intro-banner-btn,
  .case-converter-intro-banner .intro-banner-btn {
    width: 100% !important;
    justify-content: center !important;
  }
}

/* =============================================================================
   HERO TOP FLANKED LAYOUT (Age & BMI Left | Title Center | Case Converter Right)
   ============================================================================= */
.hero-top-flanked-layout {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto minmax(260px, 1fr);
  align-items: stretch;
  gap: 1.25rem;
  margin: 0.5rem auto 1.5rem;
  max-width: 1360px;
}

.hero-header-compact.center-flank {
  margin: 0 auto;
  padding: 0 0.5rem;
  text-align: center;
  flex-shrink: 0;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.spotlight-flank-card {
  border-radius: var(--radius-16);
  padding: 1rem 1.2rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), 
              border-color 0.3s ease, 
              box-shadow 0.35s ease;
  will-change: transform, box-shadow;
}

/* Ambient Floating & Breathing Glow Keyframes */
@keyframes flank-float-health {
  0%, 100% {
    transform: translateY(0);
    box-shadow: 0 8px 24px -6px rgba(16, 185, 129, 0.14);
  }
  50% {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px -6px rgba(16, 185, 129, 0.28);
  }
}

@keyframes flank-float-text {
  0%, 100% {
    transform: translateY(0);
    box-shadow: 0 8px 24px -6px rgba(168, 85, 247, 0.14);
  }
  50% {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px -6px rgba(168, 85, 247, 0.28);
  }
}

/* Subtle Shimmer Sweeping Light Effect */
.spotlight-flank-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -150%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.18), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
  animation: flank-shimmer 6s infinite ease-in-out;
}

[data-theme="dark"] .spotlight-flank-card::before {
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
}

@keyframes flank-shimmer {
  0% { left: -150%; }
  25% { left: 150%; }
  100% { left: 150%; }
}

.spotlight-flank-card.banner-health {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08), rgba(6, 182, 212, 0.08));
  border: 1px solid rgba(16, 185, 129, 0.3);
  animation: flank-float-health 5s ease-in-out infinite;
}

.spotlight-flank-card.banner-health:hover {
  transform: translateY(-6px) scale(1.015);
  border-color: rgba(16, 185, 129, 0.6);
  box-shadow: 0 20px 38px -8px rgba(16, 185, 129, 0.35);
  animation-play-state: paused;
}

.spotlight-flank-card.banner-text {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(59, 130, 246, 0.08));
  border: 1px solid rgba(168, 85, 247, 0.3);
  animation: flank-float-text 5s ease-in-out infinite;
  animation-delay: 2.5s;
}

.spotlight-flank-card.banner-text:hover {
  transform: translateY(-6px) scale(1.015);
  border-color: rgba(168, 85, 247, 0.6);
  box-shadow: 0 20px 38px -8px rgba(168, 85, 247, 0.35);
  animation-play-state: paused;
}

/* Science Flank Card (Exact matching size of left health card) */
@keyframes flank-float-science {
  0%, 100% {
    transform: translateY(0);
    box-shadow: 0 8px 24px -6px rgba(59, 130, 246, 0.16);
  }
  50% {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px -6px rgba(59, 130, 246, 0.32);
  }
}

.spotlight-flank-card.banner-science {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(99, 102, 241, 0.08));
  border: 1px solid rgba(59, 130, 246, 0.3);
  animation: flank-float-science 5s ease-in-out infinite;
  animation-delay: 1.5s;
  cursor: pointer;
}

.spotlight-flank-card.banner-science:hover {
  transform: translateY(-6px) scale(1.015);
  border-color: rgba(59, 130, 246, 0.6);
  box-shadow: 0 20px 38px -8px rgba(59, 130, 246, 0.35);
  animation-play-state: paused;
}

/* Touch tactile feedback for mobile devices */
.spotlight-flank-card:active {
  transform: scale(0.985);
  transition-duration: 0.1s;
}

/* Flank Card Header & Badges */
.flank-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  width: fit-content;
}

.flank-content {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

/* Icon Micro-Animations */
@keyframes icon-heartbeat {
  0%, 100% { transform: scale(1); }
  12% { transform: scale(1.18); }
  24% { transform: scale(1); }
  36% { transform: scale(1.12); }
  60% { transform: scale(1); }
}

@keyframes icon-text-wiggle {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.08) rotate(-4deg); }
}

.spotlight-flank-card.banner-health .intro-banner-icon svg {
  animation: icon-heartbeat 3s ease-in-out infinite;
  transform-origin: center;
}

.spotlight-flank-card.banner-text .intro-banner-icon svg {
  animation: icon-text-wiggle 4s ease-in-out infinite;
  transform-origin: center;
}

@keyframes icon-calc-turn {
  0%, 100% { transform: rotate(0deg) scale(1); }
  25% { transform: rotate(-8deg) scale(1.1); }
  75% { transform: rotate(8deg) scale(1.1); }
}

.spotlight-flank-card.banner-science .intro-banner-icon svg {
  animation: icon-calc-turn 4s ease-in-out infinite;
  transform-origin: center;
}

.flank-title {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.3;
  transition: color var(--transition-fast);
}

.spotlight-flank-card.banner-health:hover .flank-title {
  color: #059669;
}

[data-theme="dark"] .spotlight-flank-card.banner-health:hover .flank-title {
  color: #34d399;
}

.spotlight-flank-card.banner-text:hover .flank-title {
  color: #7c3aed;
}

[data-theme="dark"] .spotlight-flank-card.banner-text:hover .flank-title {
  color: #a78bfa;
}

.spotlight-flank-card.banner-science:hover .flank-title {
  color: var(--color-primary-600);
}

[data-theme="dark"] .spotlight-flank-card.banner-science:hover .flank-title {
  color: var(--color-primary-400);
}

.flank-badge.badge-science {
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-primary-600);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

[data-theme="dark"] .flank-badge.badge-science {
  background: rgba(59, 130, 246, 0.2);
  color: var(--color-primary-400);
  border-color: rgba(59, 130, 246, 0.4);
}

.pulse-dot.dot-science {
  background: #3b82f6;
  box-shadow: 0 0 8px #3b82f6;
}

.flank-btn.btn-science {
  background: linear-gradient(135deg, var(--color-primary-600), #4f46e5) !important;
  color: #fff !important;
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
}

.flank-btn.btn-science:hover {
  background: linear-gradient(135deg, var(--color-primary-500), #6366f1) !important;
  box-shadow: 0 6px 18px rgba(59, 130, 246, 0.4) !important;
}

.flank-desc {
  font-size: 0.76rem;
  color: var(--text-secondary);
  margin: 0.2rem 0 0;
  line-height: 1.4;
}

.flank-btn {
  align-self: flex-start;
  font-size: 0.8rem !important;
  padding: 0.45rem 1rem !important;
  transition: all 0.25s ease;
}

.flank-btn svg {
  transition: transform 0.25s ease;
}

.spotlight-flank-card:hover .flank-btn svg,
.flank-btn:hover svg {
  transform: translateX(4px);
}

/* Enlarged Animated Headline & Center Flank Styling */
.hero-header-compact.center-flank {
  margin: 0 auto;
  padding: 0 0.75rem;
  text-align: center;
  flex-shrink: 0;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.hero-header-compact.center-flank .hero-headline-compact {
  font-size: clamp(2.3rem, 4.4vw, 3.4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.035em;
  margin-bottom: 0.65rem;
  animation: hero-headline-pop 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero-header-compact.center-flank .hero-subheadline-compact {
  font-size: clamp(0.95rem, 1.4vw, 1.12rem);
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 520px;
}

@keyframes hero-headline-pop {
  0% {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* =============================================================================
   SITE-WIDE RICH ANIMATIONS & INTERACTIVE MOTION ENGINE
   ============================================================================= */

/* 1. Category Cards Hover Dynamics */
.category-card {
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), 
              border-color 0.25s ease, 
              box-shadow 0.3s ease !important;
}

.category-card:hover {
  transform: translateY(-5px) scale(1.018);
  box-shadow: 0 14px 28px -6px rgba(37, 99, 235, 0.18), 0 6px 14px -4px rgba(0, 0, 0, 0.08);
  border-color: var(--color-primary-400);
}

.category-card:hover .category-icon-wrap {
  transform: scale(1.15) rotate(4deg);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 2. Quick Conversion Chips Interactive Bounce */
.chip-btn {
  transition: transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1), 
              background-color 0.2s ease, 
              border-color 0.2s ease, 
              box-shadow 0.22s ease !important;
}

.chip-btn:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.25);
  border-color: var(--color-primary-400);
}

.chip-btn:active {
  transform: translateY(0) scale(0.98);
}

/* 3. Specialized Suites & Quick Tool Cards */
.quick-tool-card {
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), 
              border-color 0.3s ease, 
              box-shadow 0.35s ease !important;
}

.quick-tool-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 38px -10px rgba(37, 99, 235, 0.22);
}

.quick-tool-card:hover .quick-tool-icon {
  transform: scale(1.12) rotate(6deg);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 4. Live Gradient Text Flow Animation */
.gradient-text {
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-secondary-500) 40%, var(--color-accent-500) 70%, var(--color-primary-500) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-glow-flow 7s ease infinite;
}

@keyframes gradient-glow-flow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* 5. Animated Badge Pulse Enhancement */
.animate-badge-pulse {
  animation: badge-glow-pulse 2.8s ease-in-out infinite;
}

@keyframes badge-glow-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.3);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 14px 2px rgba(59, 130, 246, 0.35);
    transform: scale(1.02);
  }
}

/* 6. Live Unit Converter Card Polish */
.live-converter-card {
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.live-converter-card:focus-within {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 16px 36px -6px rgba(59, 130, 246, 0.25);
}

/* 7. Swap Button Spin on Click */
.converter-swap-btn {
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s ease;
}

.converter-swap-btn:hover {
  transform: rotate(180deg) scale(1.08);
}

.converter-swap-btn:active {
  transform: rotate(360deg) scale(0.95);
}

/* =============================================================================
   MOBILE USER FRIENDLY & TABLET RESPONSIVE ADAPTATIONS
   ============================================================================= */
@media (max-width: 1160px) {
  .hero-top-flanked-layout {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }

  .hero-header-compact.center-flank {
    grid-column: 1 / -1;
    order: -1;
    max-width: 100%;
    margin-bottom: 0.5rem;
  }
}

@media (max-width: 768px) {
  .hero-top-flanked-layout {
    grid-template-columns: 1fr;
    gap: 0.85rem;
    margin: 0.25rem auto 1.25rem;
  }

  .spotlight-flank-card {
    padding: 0.85rem 1rem;
    animation: none; /* Disable continuous float on small screens to save battery & prevent jarring */
  }

  .spotlight-flank-card .flank-content {
    align-items: center;
  }

  .spotlight-flank-card .flank-desc {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .flank-btn {
    width: 100% !important;
    min-height: 42px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
  }
}

@media (max-width: 480px) {
  .hero-headline-compact {
    font-size: clamp(1.4rem, 6vw, 1.85rem) !important;
  }

  .spotlight-flank-card {
    border-radius: var(--radius-12);
  }

  .flank-title {
    font-size: 0.9rem;
  }

  .flank-desc {
    font-size: 0.72rem;
  }
}


/* =============================================================================
   ADMIN PANEL & THEME CUSTOMIZER STYLES (Raycast / Linear Tier)
   ============================================================================= */

/* 1. Global Announcement Bar */
.admin-announcement-bar {
  width: 100%;
  padding: 0.55rem 1rem;
  background: linear-gradient(90deg, #1e1b4b, #312e81, #1e1b4b);
  border-bottom: 1px solid rgba(129, 140, 248, 0.35);
  color: #f8fafc;
  font-size: 0.82rem;
  z-index: 1001;
  position: relative;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.admin-announcement-bar.style-success {
  background: linear-gradient(90deg, #064e3b, #047857, #064e3b);
  border-color: rgba(52, 211, 153, 0.4);
}

.admin-announcement-bar.style-warning {
  background: linear-gradient(90deg, #78350f, #b45309, #78350f);
  border-color: rgba(251, 191, 36, 0.4);
}

.announcement-inner {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  position: relative;
}

.announcement-badge {
  padding: 0.15rem 0.5rem;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.announcement-action {
  color: #67e8f9;
  font-weight: 700;
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.announcement-action:hover {
  color: #ffffff;
}

.announcement-dismiss-btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  line-height: 1;
}

.announcement-dismiss-btn:hover {
  color: #ffffff;
}

/* 2. Admin Auth Password Modal */
.admin-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1060;
  background: rgba(11, 15, 25, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.admin-modal-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

.admin-auth-dialog {
  width: 100%;
  max-width: 420px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-20);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.admin-modal-backdrop.is-active .admin-auth-dialog {
  transform: scale(1);
}

.admin-auth-header {
  text-align: center;
}

.admin-auth-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-14);
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-500);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 0.75rem;
}

.admin-auth-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.admin-auth-header p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.admin-auth-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.admin-input-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.admin-input-field {
  width: 100%;
  padding: 0.7rem 0.95rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.admin-input-field:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.admin-auth-error-msg {
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
  font-size: 0.78rem;
  font-weight: 600;
}

.admin-auth-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* 3. Full Enterprise Admin Dashboard Modal */
.admin-dashboard-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1070;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.admin-dashboard-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

.admin-dashboard-container {
  width: 100%;
  max-width: 1040px;
  height: 85vh;
  max-height: 750px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-24);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.5);
  display: grid;
  grid-template-columns: 240px 1fr;
  overflow: hidden;
  transform: scale(0.97);
  transition: transform var(--transition-normal);
}

.admin-dashboard-backdrop.is-active .admin-dashboard-container {
  transform: scale(1);
}

/* Sidebar */
.admin-dashboard-sidebar {
  background: var(--bg-surface-subtle);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 1.25rem 0.85rem;
}

.admin-sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0 0.5rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
}

.admin-badge-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-secondary-500));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.admin-sidebar-brand h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
}

.admin-sidebar-brand span {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.admin-sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  overflow-y: auto;
}

.admin-nav-tab {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid transparent;
  background: none;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
  width: 100%;
}

.admin-nav-tab:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
}

.admin-nav-tab.is-active {
  background: var(--bg-surface-elevated);
  color: var(--color-primary-600);
  border-color: var(--border-color);
  box-shadow: var(--shadow-xs);
}

[data-theme="dark"] .admin-nav-tab.is-active {
  color: var(--color-primary-400);
}

.admin-sidebar-footer {
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.admin-btn-logout {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 600;
  color: #ef4444;
  border: 1px solid transparent;
  background: rgba(239, 68, 68, 0.08);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-btn-logout:hover {
  background: #ef4444;
  color: #ffffff;
}

/* Main Area */
.admin-dashboard-main {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background: var(--bg-surface);
}

.admin-main-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.admin-main-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.2rem;
}

.admin-main-header p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
}

.admin-close-circle {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  line-height: 1;
  transition: all var(--transition-fast);
}

.admin-close-circle:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
}

.admin-tab-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.admin-tab-content {
  display: none;
  flex-direction: column;
  gap: 1.25rem;
}

.admin-tab-content.is-active {
  display: flex;
}

/* Cards inside admin */
.admin-section-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-16);
  padding: 1.25rem;
  box-shadow: var(--shadow-xs);
}

.admin-section-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.admin-subtext {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin-bottom: 1rem;
}

.admin-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

/* Color Presets */
.admin-color-presets {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.color-preset-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  border: 2px solid #ffffff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.color-preset-btn:hover {
  transform: scale(1.15);
}

.color-preset-btn.is-active {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 3px;
  transform: scale(1.18);
  box-shadow: 0 0 12px var(--color-primary-glow);
}

.custom-color-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.custom-color-wrap input[type="color"] {
  width: 26px;
  height: 26px;
  border: none;
  padding: 0;
  background: none;
  cursor: pointer;
}

.custom-color-wrap input[type="text"] {
  width: 75px;
  font-size: 0.8rem;
  font-family: ui-monospace, monospace;
  font-weight: 700;
  color: var(--text-primary);
}

/* Radio Group */
.admin-radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.admin-radio-label {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.82rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-radio-label:hover {
  border-color: var(--color-primary-400);
}

.admin-radio-label input[type="radio"]:checked + span {
  font-weight: 700;
  color: var(--color-primary-600);
}

[data-theme="dark"] .admin-radio-label input[type="radio"]:checked + span {
  color: var(--color-primary-400);
}

/* Checkbox & Switch */
.admin-checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.admin-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.admin-checkbox-label input {
  margin-top: 0.2rem;
}

.admin-checkbox-label div strong {
  display: block;
  font-size: 0.82rem;
  color: var(--text-primary);
}

.admin-checkbox-label div span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.admin-textarea {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--text-primary);
  resize: vertical;
}

.admin-actions-bar {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* Analytics Table */
.admin-analytics-table-wrap {
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.admin-table th {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.admin-table td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-color-subtle);
  color: var(--text-primary);
}

.admin-badge-count {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-600);
  font-weight: 700;
  font-size: 0.75rem;
}

.admin-status-pill {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
}

.admin-status-pill.status-ok {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.admin-status-pill.status-empty {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
}

/* Category Toggles */
.admin-category-toggles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.admin-cat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.admin-mini-toggle {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
}

.admin-mini-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: #cbd5e1;
  border-radius: 20px;
  transition: 0.2s;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: 0.2s;
}

input:checked + .toggle-slider {
  background-color: var(--color-primary-500);
}

input:checked + .toggle-slider:before {
  transform: translateX(16px);
}

/* Density Utility Classes */
html.density-ultra .section-spacing {
  padding-top: 1.25rem !important;
  padding-bottom: 1.25rem !important;
}

html.density-ultra .category-card {
  padding: 0.75rem !important;
  min-height: 110px !important;
}

html.density-relaxed .section-spacing {
  padding-top: 3.5rem !important;
  padding-bottom: 3.5rem !important;
}

/* Mobile Admin Dashboard Responsiveness */
@media (max-width: 768px) {
  .admin-dashboard-container {
    grid-template-columns: 1fr;
    height: 92vh;
  }

  .admin-dashboard-sidebar {
    display: none; /* Can be toggled or compact */
  }

  .admin-grid-2 {
    grid-template-columns: 1fr;
  }

  .admin-category-toggles {
    grid-template-columns: 1fr;
  }
}



/* =============================================================================
   ADMIN LOGO TAP MICRO-ANIMATIONS & FLOATING INDICATOR PILL
   ============================================================================= */

.logo-icon-wrap {
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease;
}

.logo-icon-wrap.admin-tap-pulse-1 {
  animation: adminPulse1 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.logo-icon-wrap.admin-tap-pulse-2 {
  animation: adminPulse2 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.logo-icon-wrap.admin-tap-pulse-3 {
  animation: adminPulse3 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes adminPulse1 {
  0% { transform: scale(1); }
  50% { transform: scale(1.22); box-shadow: 0 0 18px var(--color-primary-glow); filter: brightness(1.2); }
  100% { transform: scale(1); }
}

@keyframes adminPulse2 {
  0% { transform: scale(1); }
  40% { transform: scale(1.3) rotate(-8deg); box-shadow: 0 0 26px var(--color-primary-glow); filter: brightness(1.3); }
  100% { transform: scale(1); }
}

@keyframes adminPulse3 {
  0% { transform: scale(1); }
  30% { transform: scale(1.42) rotate(10deg); box-shadow: 0 0 35px rgba(16, 185, 129, 0.6); filter: brightness(1.4); }
  60% { transform: scale(0.92); }
  100% { transform: scale(1); }
}

/* Floating Tap Indicator Pill */
.admin-tap-indicator-pill {
  position: fixed;
  top: calc(var(--header-height) + 12px);
  left: clamp(1rem, 3vw, 2.5rem);
  z-index: 1090;
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  box-shadow: 0 12px 32px -4px rgba(0, 0, 0, 0.45), 0 0 20px var(--color-primary-glow);
  color: #f8fafc;
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  opacity: 0;
  transform: translateY(-10px) scale(0.94);
  pointer-events: none;
  transition: opacity 0.22s cubic-bezier(0.16, 1, 0.3, 1), transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.admin-tap-indicator-pill.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.admin-tap-indicator-pill.is-unlocked {
  background: linear-gradient(135deg, #064e3b, #059669);
  border-color: rgba(52, 211, 153, 0.5);
  box-shadow: 0 12px 35px -4px rgba(16, 185, 129, 0.45), 0 0 25px rgba(16, 185, 129, 0.5);
}

.pill-dots-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.pill-dots-row .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.pill-dots-row .dot.active {
  background: #60a5fa;
  box-shadow: 0 0 10px #60a5fa;
  transform: scale(1.25);
}

.pill-dots-row .dot.active.full {
  background: #34d399;
  box-shadow: 0 0 12px #34d399;
}

.pill-text-content {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* =============================================================================
   KNOWLEDGE BASE ARTICLE READER MODAL (Authoritative Guides Viewer)
   ============================================================================= */
.article-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.article-modal-backdrop.is-active {
  opacity: 1;
  visibility: visible;
}

.article-modal-container {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-24);
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
  width: 100%;
  max-width: 860px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.96);
  transition: transform var(--transition-normal);
}

.article-modal-backdrop.is-active .article-modal-container {
  transform: scale(1);
}

.article-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface-subtle);
}

.article-modal-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 600;
}

.article-category-badge {
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  border: 1px solid rgba(79, 70, 229, 0.2);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.7rem;
}

[data-theme="dark"] .article-category-badge {
  background: rgba(79, 70, 229, 0.2);
  color: #c7d2fe;
}

.article-close-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 1.4rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.article-close-circle:hover {
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  border-color: var(--color-primary-400);
  transform: scale(1.08);
}

.article-modal-body {
  padding: 1.75rem clamp(1.25rem, 4vw, 2.5rem);
  overflow-y: auto;
  scrollbar-width: thin;
}

.reader-title {
  font-size: clamp(1.4rem, 2.5vw, 1.85rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.reader-author-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color-subtle);
}

.reader-prose {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.reader-prose h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.5rem 0 0.65rem;
}

.reader-prose p {
  margin-bottom: 1rem;
}

.reader-prose ul, .reader-prose ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
}

.reader-prose li {
  margin-bottom: 0.4rem;
}

.article-callout-box {
  background: #f8faff;
  border: 1.5px solid #c7d2fe;
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  color: #1e1b4b;
}

[data-theme="dark"] .article-callout-box {
  background: rgba(79, 70, 229, 0.1);
  border-color: rgba(79, 70, 229, 0.3);
  color: #e0e7ff;
}

.article-data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.85rem;
}

.article-data-table th, .article-data-table td {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-data-table th {
  background: var(--bg-surface-subtle);
  font-weight: 700;
  color: var(--text-primary);
}

.reader-footer-actions {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Universal Mobile & Touch Friendliness */
@media (max-width: 768px) {
  /* Prevent iOS auto-zoom by enforcing 16px minimum font size on form controls */
  input[type="text"],
  input[type="number"],
  input[type="search"],
  select,
  textarea {
    font-size: 16px !important;
  }

  /* Adequate touch target sizing for buttons and interactive controls */
  .btn,
  .action-btn,
  .category-tab-btn,
  .favorite-heart-btn,
  .blog-read-btn {
    min-height: 42px;
    touch-action: manipulation;
  }

  /* Smooth scroll containers without overflow */
  .category-filter-nav,
  .trending-chips-wrap,
  .converter-category-tabs {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
  }
}

/* --------------------------------------------------------------------------
   Cookie Consent Banner (GDPR, CCPA & AdSense Compliance)
   -------------------------------------------------------------------------- */
.cookie-banner {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  width: min(92%, 840px);
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-16, 16px);
  box-shadow: 0 12px 32px -4px rgba(0, 0, 0, 0.18), 0 4px 12px rgba(0, 0, 0, 0.08);
  padding: 1rem 1.25rem;
  z-index: 9999;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.35s ease;
  opacity: 0;
}

[data-theme="dark"] .cookie-banner {
  background: rgba(15, 23, 42, 0.94);
  border-color: rgba(255, 255, 255, 0.12);
}

.cookie-banner.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.cookie-banner-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.cookie-banner-text {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.84rem;
  color: var(--text-secondary, #64748b);
  line-height: 1.45;
  flex: 1;
  min-width: 260px;
}

.cookie-banner-text svg {
  flex-shrink: 0;
  color: var(--color-primary-500, #3b82f6);
}

.cookie-link {
  color: var(--color-primary-500, #3b82f6);
  text-decoration: underline;
  font-weight: 500;
}

.cookie-banner-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .cookie-banner {
    bottom: 0.75rem;
    width: 95%;
    padding: 0.85rem 1rem;
  }
  .cookie-banner-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

/* Modern AdSense Adaptive Slot (Hides dashed placeholder when live ad is served) */
.adsense-box:has(ins.adsbygoogle),
.adsense-box:has(iframe),
.adsense-box.ad-loaded {
  border: none !important;
  background: transparent !important;
  padding: 0 !important;
  min-height: auto !important;
}

.adsense-box:has(ins.adsbygoogle) .ad-spec-label,
.adsense-box:has(iframe) .ad-spec-label,
.adsense-box.ad-loaded .ad-spec-label,
.adsense-box:has(ins.adsbygoogle)::before,
.adsense-box:has(iframe)::before,
.adsense-box.ad-loaded::before {
  display: none !important;
}


/* Seamless collapse when ads are disabled via Admin or ad blocker */
.hero-split-grid.no-hero-ad,
.hero-split-grid:has(.hero-ad-card[style*="display: none"]),
.hero-split-grid:has(.hero-ad-card[style*="display:none"]) {
  grid-template-columns: 1fr !important;
  max-width: 920px !important;
  margin: 0 auto !important;
}

.adsense-slot-container:empty,
.adsense-slot-container[style*="display: none"],
.adsense-slot-container[style*="display:none"] {
  display: none !important;
  margin: 0 !important;
  padding: 0 !important;
}



/* =========================================================================
   Scientific Metrology & Standards Hub Styling
   ========================================================================= */
.standards-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-24);
  padding: clamp(1rem, 2vw, 1.5rem);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.standards-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.15rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.standards-block-title {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.standards-tag {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--color-primary-50);
  color: var(--color-primary-600);
  border: 1px solid var(--color-primary-200);
}

[data-theme="dark"] .standards-tag {
  background: rgba(37, 99, 235, 0.15);
  color: var(--color-primary-400);
  border-color: rgba(37, 99, 235, 0.3);
}

.si-units-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.si-unit-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.si-unit-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary-500);
}

.si-symbol-badge {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-800));
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.si-unit-info h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.si-desc {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0.65rem;
}

.si-constant {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.si-constant code {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-primary-600);
}

[data-theme="dark"] .si-constant code {
  color: var(--color-primary-400);
}

.pitfalls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.pitfall-card {
  padding: 1.35rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  border-left: 4px solid #f59e0b;
}

.pitfall-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #d97706;
  margin-bottom: 0.4rem;
}

[data-theme="dark"] .pitfall-badge {
  color: #fbbf24;
}

.pitfall-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.pitfall-card p {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0;
}

.proofs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.proof-card {
  padding: 1.35rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.proof-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.proof-definition {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0.85rem;
}

.proof-steps {
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--text-secondary);
}

.proof-calc {
  background: var(--bg-surface-secondary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-top: 0.65rem;
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-primary);
}

@media (max-width: 640px) {
  .si-units-grid,
  .pitfalls-grid,
  .proofs-grid {
    grid-template-columns: 1fr !important;
    gap: 1rem !important;
  }

  .standards-block {
    padding: 1.15rem 0.85rem !important;
    border-radius: var(--radius-16) !important;
    margin-bottom: 1.5rem !important;
  }

  .standards-block-header {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 0.5rem !important;
    margin-bottom: 1.25rem !important;
    padding-bottom: 0.75rem !important;
  }

  .standards-tab-nav {
    overflow-x: auto !important;
    width: 100% !important;
    flex-wrap: nowrap !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: thin !important;
    padding-bottom: 0.5rem !important;
  }

  .standards-tab-btn {
    white-space: nowrap !important;
    flex-shrink: 0 !important;
    padding: 0.45rem 0.85rem !important;
    font-size: 0.78rem !important;
  }
}

/* Global Mobile Overflow & Text Clamping Protection */
html, body {
  overflow-x: hidden !important;
  width: 100% !important;
  max-width: 100vw !important;
}

.site-main, .container {
  max-width: 100% !important;
  box-sizing: border-box !important;
}

@media (max-width: 640px) {
  .floating-actions-wrap {
    bottom: 1rem !important;
    right: 1rem !important;
    gap: 0.5rem !important;
  }

  .fab-btn {
    width: 42px !important;
    height: 42px !important;
  }

  .section-title {
    font-size: clamp(1.6rem, 6.5vw, 2.1rem) !important;
  }

  .section-subtitle {
    font-size: 0.92rem !important;
    line-height: 1.55 !important;
  }

  .section-spacing {
    padding-top: 1.5rem !important;
    padding-bottom: 1.5rem !important;
  }
}

/* ==========================================================================
   Everyday Precision Tools: Side-by-Side Dual Column Architecture
   ========================================================================== */
.everyday-duo-grid,
.precision-tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  align-items: start;
  margin-top: 0.75rem;
}

.everyday-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (max-width: 768px) {
  .everyday-duo-grid,
  .precision-tools-grid {
    grid-template-columns: 1fr !important;
    gap: 1.25rem !important;
  }
}

.quick-tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.quick-tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary-500);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .quick-tool-card:hover {
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
}

.quick-tool-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
}

.quick-tool-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-lg);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.quick-tool-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.quick-tool-desc {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

.quick-tool-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tool-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.tool-form-row {
  display: flex;
  gap: 0.75rem;
}

.tool-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.tool-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-surface-secondary);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-sizing: border-box;
}

.tool-input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.tool-btn-row {
  display: flex;
  gap: 0.65rem;
  align-items: center;
}

.tool-action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
  font-weight: 600;
}

.tool-result-box {
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.tool-primary-metric {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
}

.tool-result-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-600);
  font-family: var(--font-mono);
}

[data-theme="dark"] .tool-result-num {
  color: var(--color-primary-400);
}

.tool-unit-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.tool-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
}

.tool-stat-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.stat-chip-lbl {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.stat-chip-val {
  font-size: 0.92rem;
  color: var(--text-primary);
  font-weight: 700;
}

.tool-copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background: transparent;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.85rem;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  align-self: flex-start;
}

.tool-copy-btn:hover {
  background: var(--bg-card);
  border-color: var(--color-primary-500);
  color: var(--color-primary-600);
}

/* BMI Unit Toggle */
.bmi-unit-toggle {
  display: flex;
  background: var(--bg-surface-secondary);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  gap: 0.25rem;
}

.bmi-toggle-btn {
  flex: 1;
  padding: 0.45rem 0.75rem;
  border: none;
  background: transparent;
  border-radius: calc(var(--radius-md) - 2px);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.bmi-toggle-btn.active {
  background: var(--bg-card);
  color: var(--color-primary-600);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .bmi-toggle-btn.active {
  color: var(--color-primary-400);
}

.bmi-result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.bmi-status-badge {
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-under {
  background: rgba(56, 189, 248, 0.15);
  color: #0284c7;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.badge-normal {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-over {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-obese {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.bmi-meter-wrapper {
  margin: 0.5rem 0;
}

.bmi-meter-bar {
  position: relative;
  height: 12px;
  border-radius: 6px;
  display: flex;
  overflow: visible;
  background: #cbd5e1;
}

.bmi-meter-segment {
  height: 100%;
}

.seg-under { width: 14%; background: #38bdf8; border-top-left-radius: 6px; border-bottom-left-radius: 6px; }
.seg-normal { width: 26%; background: #10b981; }
.seg-over { width: 20%; background: #f59e0b; }
.seg-obese { width: 40%; background: #ef4444; border-top-right-radius: 6px; border-bottom-right-radius: 6px; }

.bmi-needle {
  position: absolute;
  top: -5px;
  width: 4px;
  height: 22px;
  background: var(--text-primary);
  border-radius: 2px;
  transform: translateX(-50%);
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.5);
  transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.bmi-meter-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 0.35rem;
}

.bmi-range-info {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  line-height: 1.5;
  background: var(--bg-card);
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.bmi-range-info strong {
  color: var(--color-primary-600);
  margin-left: 0.25rem;
}

[data-theme="dark"] .bmi-range-info strong {
  color: var(--color-primary-400);
}

@media (max-width: 640px) {
  .precision-tools-grid {
    grid-template-columns: 1fr !important;
    gap: 1.25rem !important;
  }
  .tool-stats-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.5rem !important;
  }
}

/* --------------------------------------------------------------------------
   Breadcrumbs Navigation (SEO & Accessibility)
   -------------------------------------------------------------------------- */
.breadcrumb-trail {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
}

.breadcrumb-trail ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumb-trail li {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb-trail a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-trail a:hover {
  color: var(--color-primary-600);
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--text-muted);
  opacity: 0.6;
  user-select: none;
}

.breadcrumb-trail [aria-current="page"] {
  color: var(--color-primary-600);
  font-weight: 600;
}

[data-theme="dark"] .breadcrumb-trail [aria-current="page"] {
  color: var(--color-primary-400);
}

.section-breadcrumb {
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: flex-start;
}

.section-breadcrumb-center {
  justify-content: center;
}

/* =========================================================================
   TOOL CONTENT GUIDE, WORKED EXAMPLES & RELATED CALCULATORS
   ========================================================================= */
.tool-guide-section {
  margin-top: 1rem;
}

.tool-guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1rem;
  margin-top: 0.75rem;
}

.tool-guide-card {
  background: var(--bg-surface, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-16, 16px);
  padding: 1.15rem;
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.05));
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.tool-guide-card:hover {
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.08));
  border-color: var(--color-primary-300, #93c5fd);
}

.tool-guide-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full, 9999px);
  background: var(--color-primary-50, #eff6ff);
  color: var(--color-primary-600, #2563eb);
  margin-bottom: 0.75rem;
}

[data-theme="dark"] .tool-guide-badge {
  background: rgba(37, 99, 235, 0.15);
  color: #60a5fa;
}

.tool-guide-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
  margin-bottom: 0.5rem;
  line-height: 1.35;
}

.tool-guide-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary, #475569);
  margin-bottom: 0.75rem;
}

.formula-callout {
  background: var(--bg-secondary, #f8fafc);
  border-left: 3px solid var(--color-primary-600, #2563eb);
  padding: 0.65rem 0.95rem;
  border-radius: 0 var(--radius-md, 8px) var(--radius-md, 8px) 0;
  margin: 0.65rem 0;
  font-family: 'Space Grotesk', monospace, sans-serif;
  font-size: 0.85rem;
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .formula-callout {
  background: rgba(255, 255, 255, 0.04);
}

.example-calc-box {
  background: var(--bg-secondary, #f8fafc);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-md, 8px);
  padding: 0.75rem 1rem;
  margin: 0.65rem 0;
}

[data-theme="dark"] .example-calc-box {
  background: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.08);
}

.example-calc-header {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary-600, #2563eb);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.example-calc-body {
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--text-secondary, #475569);
}

.common-mistakes-box {
  background: rgba(239, 68, 68, 0.05);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md, 8px);
  padding: 0.75rem 1rem;
  margin: 0.65rem 0;
}

.common-mistakes-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: #dc2626;
  margin-bottom: 0.45rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

[data-theme="dark"] .common-mistakes-title {
  color: #f87171;
}

.common-mistakes-list {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--text-secondary, #475569);
}

.common-mistakes-list li {
  margin-bottom: 0.35rem;
}

.related-tools-container {
  margin-top: 0.85rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-color, #e2e8f0);
}

.related-tools-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted, #94a3b8);
  margin-bottom: 0.75rem;
}

.related-tools-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.related-tool-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full, 9999px);
  background: var(--bg-secondary, #f8fafc);
  border: 1px solid var(--border-color, #e2e8f0);
  color: var(--text-secondary, #475569);
  text-decoration: none;
  transition: all 0.15s ease;
}

.related-tool-pill:hover {
  background: var(--color-primary-50, #eff6ff);
  border-color: var(--color-primary-400, #60a5fa);
  color: var(--color-primary-600, #2563eb);
  transform: translateY(-1px);
}

[data-theme="dark"] .related-tool-pill {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
}

[data-theme="dark"] .related-tool-pill:hover {
  background: rgba(37, 99, 235, 0.2);
  border-color: #3b82f6;
  color: #93c5fd;
}

.tool-meta-trust {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.74rem;
  color: var(--text-muted, #94a3b8);
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color, #e2e8f0);
}

/* --------------------------------------------------------------------------
   Live Dual-Mode Embedded Calculator (Normal & Science Mode)
   -------------------------------------------------------------------------- */
.hero-live-calculator-card {
  background: var(--glass-bg, rgba(255, 255, 255, 0.85));
  border: 1px solid var(--glass-border, rgba(255, 255, 255, 0.6));
  border-radius: var(--radius-20, 20px);
  padding: 0.95rem;
  backdrop-filter: var(--glass-blur, blur(16px));
  -webkit-backdrop-filter: var(--glass-blur, blur(16px));
  box-shadow: 0 10px 30px -8px rgba(37, 99, 235, 0.15), var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .hero-live-calculator-card {
  background: rgba(15, 23, 42, 0.88);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 12px 32px -8px rgba(0, 0, 0, 0.45);
}

.hero-live-calculator-card:hover {
  border-color: var(--color-primary-400, #60a5fa);
  box-shadow: 0 14px 36px -6px rgba(37, 99, 235, 0.22);
}

/* Calculator Top Bar */
.calc-card-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

/* Animated Mode Switcher Glider */
.calc-mode-switcher {
  position: relative;
  display: inline-flex;
  background: var(--bg-surface-subtle, #f1f5f9);
  padding: 3px;
  border-radius: var(--radius-full, 9999px);
  border: 1px solid var(--border-color, #e2e8f0);
}

[data-theme="dark"] .calc-mode-switcher {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
}

.calc-mode-btn {
  position: relative;
  z-index: 2;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary, #64748b);
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-full, 9999px);
  transition: color 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  user-select: none;
}

.calc-mode-btn.is-active {
  color: #ffffff;
}

.calc-mode-glider {
  position: absolute;
  top: 3px;
  left: 3px;
  height: calc(100% - 6px);
  width: calc(50% - 3px);
  background: linear-gradient(135deg, var(--color-primary-600, #2563eb), var(--color-primary-700, #1d4ed8));
  border-radius: var(--radius-full, 9999px);
  transition: transform 0.28s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.4);
  z-index: 1;
}

.calc-mode-switcher[data-mode="science"] .calc-mode-glider,
.hero-live-calculator-card.mode-science .calc-mode-glider {
  transform: translateX(100%);
}

.calc-top-tools {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.inline-calc-angle-btn {
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.18rem 0.5rem;
  border-radius: var(--radius-xs, 4px);
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-primary-600, #2563eb);
  border: 1px solid rgba(59, 130, 246, 0.25);
  cursor: pointer;
  transition: all 0.15s ease;
  display: none;
}

.hero-live-calculator-card.mode-science .inline-calc-angle-btn {
  display: inline-block;
}

[data-theme="dark"] .inline-calc-angle-btn {
  background: rgba(59, 130, 246, 0.22);
  color: #93c5fd;
}

.inline-calc-angle-btn:hover {
  background: var(--color-primary-500, #3b82f6);
  color: #ffffff;
}

.calc-tool-btn {
  width: auto;
  height: auto;
  padding: 8px;
  border-radius: var(--radius-lg, 12px);
  background: var(--bg-surface-subtle, #f1f5f9);
  border: 1px solid var(--border-color, #e2e8f0);
  color: var(--text-secondary, #64748b);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.calc-tool-btn:hover {
  color: var(--color-primary-600, #2563eb);
  border-color: var(--color-primary-400, #60a5fa);
  background: var(--bg-surface, #ffffff);
  transform: scale(1.08);
}

/* Inline Screen */
.inline-calc-screen {
  background: var(--bg-surface-elevated, #f8fafc);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: var(--radius-12, 12px);
  padding: 0.5rem 0.75rem;
  text-align: right;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 62px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.04);
  transition: all 0.2s ease;
}

[data-theme="dark"] .inline-calc-screen {
  background: rgba(0, 0, 0, 0.35);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.3);
}

.inline-calc-screen .calc-expression-line {
  font-size: 0.72rem;
  color: var(--text-muted, #94a3b8);
  min-height: 16px;
  line-height: 1.2;
  font-family: var(--font-mono, monospace);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inline-calc-screen .calc-result-line {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary, #0f172a);
  line-height: 1.15;
  font-family: var(--font-mono, monospace);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: -0.02em;
}

/* Keypad Grids */
.inline-calc-keypad {
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
}

/* Scientific Section (Animated Accordion Reveal) */
.inline-calc-sci-block {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.3rem;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transform: translateY(-6px);
  transition: max-height 0.32s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.24s ease, transform 0.24s ease, margin 0.32s ease;
  pointer-events: none;
  margin-bottom: 0;
}

.hero-live-calculator-card.mode-science .inline-calc-sci-block {
  max-height: 180px;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  margin-bottom: 0.32rem;
}

/* Standard Keypad Grid (Always active) */
.inline-calc-standard-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.3rem;
}

.inline-calc-keypad .calc-key {
  height: 36px;
  font-size: 0.86rem;
  border-radius: var(--radius-md, 8px);
  position: relative;
  overflow: hidden;
}

.inline-calc-sci-block .calc-key {
  height: 30px;
  font-size: 0.74rem;
  font-weight: 600;
}

.inline-calc-keypad .calc-key:active {
  transform: scale(0.92);
}





/* ==========================================================================
   CONVERTMASTER PRO — HIDE-ON-SCROLL NAVBAR + THEME TOGGLE ENHANCEMENTS
   ========================================================================== */

/* Header hide-on-scroll animation */
.site-header {
  transition:
    transform 300ms cubic-bezier(0.4, 0, 0.2, 1),
    background 200ms cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 200ms cubic-bezier(0.4, 0, 0.2, 1),
    border-color 200ms cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.site-header.is-hidden {
  transform: translateY(-100%);
}

/* Re-show header when mobile drawer is open (drawer button is in header) */
.site-header.is-hidden:has(+ * .mobile-drawer.is-open) {
  transform: translateY(0);
}

/* Theme toggle icon — smooth rotation on toggle */
.theme-toggle-btn .icon-sun,
.theme-toggle-btn .icon-moon {
  transition: opacity 200ms ease, transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.theme-toggle-btn:active .icon-sun,
.theme-toggle-btn:active .icon-moon {
  transform: rotate(30deg) scale(0.9);
}

/* Theme toggle button — scale feedback on click */
.theme-toggle-btn:active {
  transform: scale(0.9);
}

/* Body transition for theme switching (suppressed during page load by transitions.css) */
body {
  transition:
    background-color 280ms cubic-bezier(0.4, 0, 0.2, 1),
    color 280ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   VERTICAL STACKING FOR CATEGORY TABS/PILLS, QUICK TOOL BUTTONS, & ICON BUTTONS
   ========================================================================== */
.category-tab-btn,
.category-pill,
.category-pills,
.popular-category-pill,
.quick-tool-btn,
.quick-tool-card,
.quick-tool-header,
.icon-btn,
.tool-btn,
.tool-action-btn,
.calc-tool-btn {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  text-align: center !important;
  gap: 6px !important;
}

.category-tab-btn svg,
.category-tab-btn img,
.category-pill svg,
.category-pill img,
.quick-tool-btn svg,
.quick-tool-btn img,
.icon-btn svg,
.icon-btn img,
.tool-btn svg,
.tool-btn img,
.tool-action-btn svg,
.tool-action-btn img,
.quick-tool-header svg,
.quick-tool-header img,
.quick-tool-icon {
  order: -1;
}