/* ============================================
   동신소재 (Dong Shin Materials) - 2026 Design System
   ============================================ */

/* ============================================
   1. CSS Variables & Design Tokens
   ============================================ */
:root {
  /* ============================================
     1. CSS Variables & Design Tokens
     ============================================ */

  /* Colors - Light Theme (Default) */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-bg-card: #ffffff;
  --color-bg-glass: rgba(0, 0, 0, 0.03);
  /* Subtle dark tint for glass on light */

  /* Accent Colors */
  --color-accent: #0080ff;
  /* Slightly darker for better visibility on white */
  --color-accent-hover: #0066cc;
  --color-accent-glow: rgba(0, 128, 255, 0.2);

  /* Text Colors */
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #495057;
  --color-text-muted: #868e96;
  --color-text-dark: #0a0a0a;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #ffffff 0%, #f0f7ff 50%, #ffffff 100%);
  --gradient-accent: linear-gradient(135deg, #0080ff 0%, #0056b3 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.4) 100%);
  --gradient-text: linear-gradient(90deg, #0080ff 0%, #00a0ff 50%, #0080ff 100%);

  /* Typography */
  --font-family-ko: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-family-en: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  --font-size-7xl: 4.5rem;
  --font-size-8xl: 6rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.1;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  --spacing-5xl: 8rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 20px var(--color-accent-glow);

  /* Component Specific */
  --color-navbar-scrolled: rgba(255, 255, 255, 0.9);
  --color-border-light: rgba(0, 0, 0, 0.1);
  --color-btn-outline: rgba(0, 0, 0, 0.3);
  --overlay-hero: linear-gradient(to bottom, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0.8) 100%);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-slower: 700ms ease;

  /* Z-Index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;

  /* Container */
  --container-max: 1400px;
  --container-padding: 1.5rem;
}

/* Colors - Dark Theme (Override) */
[data-theme="dark"] {
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-card: rgba(255, 255, 255, 0.03);
  --color-bg-glass: rgba(255, 255, 255, 0.05);

  /* Accent Colors */
  --color-accent: #00a8ff;
  --color-accent-hover: #33bbff;
  --color-accent-glow: rgba(0, 168, 255, 0.3);

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-muted: rgba(255, 255, 255, 0.5);
  --color-text-dark: #0a0a0a;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #0a0a0a 100%);
  --gradient-accent: linear-gradient(135deg, #00a8ff 0%, #0066cc 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
  --gradient-text: linear-gradient(90deg, #00a8ff 0%, #00d4ff 50%, #00a8ff 100%);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--color-accent-glow);

  /* Component Specific */
  --color-navbar-scrolled: rgba(10, 10, 10, 0.9);
  --color-border-light: rgba(255, 255, 255, 0.1);
  --color-btn-outline: rgba(255, 255, 255, 0.3);
  --overlay-hero: linear-gradient(to bottom, rgba(10, 10, 10, 0.3) 0%, rgba(10, 10, 10, 0.8) 100%);
}

/* ============================================
   2. Reset & Base Styles
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-ko);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

body.lang-en {
  font-family: var(--font-family-en);
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

/* ============================================
   2.5 Utility Classes
   ============================================ */
.mt-xs {
  margin-top: var(--spacing-xs);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mt-2xl {
  margin-top: var(--spacing-2xl);
}

.mt-3xl {
  margin-top: var(--spacing-3xl);
}

.mb-xs {
  margin-bottom: var(--spacing-xs);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.mb-2xl {
  margin-bottom: var(--spacing-2xl);
}

.mb-3xl {
  margin-bottom: var(--spacing-3xl);
}

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-text-muted);
}

/* ============================================
   3. Typography
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

.text-gradient {
  background: var(--gradient-text);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {

  0%,
  100% {
    background-position: 0% center;
  }

  50% {
    background-position: 100% center;
  }
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   4. Layout
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--spacing-5xl) 0;
  position: relative;
  overflow: hidden;
}

.section-dark {
  background-color: var(--color-bg-primary);
}

.section-darker {
  background-color: var(--color-bg-secondary);
}

.section-light {
  background-color: #ffffff;
  color: var(--color-text-dark);
}

/* ============================================
   5. Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  padding: var(--spacing-md) 0;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
}

/* Replace .navbar.scrolled */
/* Navbar Scrolled State */
.navbar.scrolled {
  background-color: var(--color-navbar-scrolled);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
}

/* Navbar Logo Behavior */
/* 1. Default (Transparent on Hero): White Logo */
.navbar:not(.scrolled) .navbar-logo img {
  filter: brightness(0) invert(1);
}

/* 2. Scrolled (Light Mode): Original Colors */
.navbar.scrolled .navbar-logo img {
  filter: none;
}

/* 3. Scrolled (Dark Mode): Gray/White Logo for visibility */
[data-theme="dark"] .navbar.scrolled .navbar-logo img {
  filter: brightness(0) invert(0.9);
}

/* Navbar Scrolled Text Colors (Theme Dependent) */
.navbar.scrolled .navbar-link {
  color: var(--color-text-secondary);
}

.navbar.scrolled .navbar-link:hover,
.navbar.scrolled .navbar-link.active,
.navbar.scrolled .navbar-logo span,
.navbar.scrolled .theme-toggle-btn {
  color: var(--color-text-primary);
}

.navbar.scrolled .lang-toggle,
.navbar.scrolled .theme-toggle-btn {
  border-color: var(--color-border-light);
  background: var(--color-bg-glass);
}

/* Navbar Top State (Transparent) - Always White Text for Video Background */
.navbar:not(.scrolled) .navbar-logo span,
.navbar:not(.scrolled) .theme-toggle-btn {
  color: #ffffff;
}

.navbar:not(.scrolled) .navbar-link {
  color: rgba(255, 255, 255, 0.8);
}

.navbar:not(.scrolled) .navbar-link:hover,
.navbar:not(.scrolled) .navbar-link.active {
  color: #ffffff;
}

.navbar:not(.scrolled) .navbar-link.active::after {
  background: #ffffff;
  /* White underline at top */
}

.navbar:not(.scrolled) .lang-toggle,
.navbar:not(.scrolled) .theme-toggle-btn {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(0, 0, 0, 0.2);
  /* Subtle backing for buttons */
}

.navbar:not(.scrolled) .lang-btn {
  color: rgba(255, 255, 255, 0.7);
}

.navbar:not(.scrolled) .lang-btn.active,
.navbar:not(.scrolled) .lang-btn:hover {
  color: #ffffff;
}

[data-theme="light"] .navbar:not(.scrolled) .theme-toggle-btn {
  border-color: rgba(255, 255, 255, 0.3);
  /* Ensure visibility in light mode too */
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-logo img {
  height: 40px;
  width: auto;
}

.navbar-logo span {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.navbar-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--color-text-primary);
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-glass);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-light);
}

.lang-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background: var(--color-accent);
  color: var(--color-text-primary);
}

.lang-btn:hover:not(.active) {
  color: var(--color-text-primary);
}

/* Theme Toggle */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 50%;
  background: var(--color-bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
  margin-left: var(--spacing-sm);
}

[data-theme="light"] .theme-toggle-btn {
  border-color: rgba(0, 0, 0, 0.1);
}

.theme-toggle-btn:hover {
  background: var(--color-accent);
  color: white;
  transform: rotate(15deg);
}

.theme-toggle-btn i {
  font-size: 1.1rem;
}

/* Mobile Menu */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-sm);
}

/* Mobile Toggle Button at Top */
.navbar-toggle {
  z-index: var(--z-tooltip);
  /* Ensure above menu */
}

.navbar-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  border-radius: 2px;
  transition: all 0.3s;
  transform-origin: 1px 1px;
  /* Pivot from left */
}

.navbar-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(3px, -2px);
}

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

.navbar-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(3px, 0px);
}

.navbar-toggle.active span {
  background: var(--color-text-primary) !important;
  /* Always visible on menu bg */
}

.navbar:not(.scrolled) .navbar-toggle span {
  background: #ffffff;
}

/* Mobile Toggle Button Scrolled */
.navbar.scrolled .navbar-toggle span {
  background: var(--color-text-primary);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 400px;
  height: 100vh;
  background: var(--color-bg-secondary);
  z-index: var(--z-modal);
  padding: var(--spacing-4xl) var(--spacing-xl);
  transition: right var(--transition-base);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-menu-overlay.active {
  opacity: 1;
}

/* ============================================
   6. Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-bg img,
.hero-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--overlay-hero);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: 0 var(--spacing-xl);
}

.hero-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: rgba(0, 168, 255, 0.1);
  border: 1px solid rgba(0, 168, 255, 0.3);
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: var(--font-size-7xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: #ffffff;
  margin-bottom: var(--spacing-2xl);
  line-height: var(--line-height-relaxed);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-muted);
  animation: bounce 2s infinite;
}

.scroll-indicator-icon {
  width: 24px;
  height: 40px;
  border: 2px solid currentColor;
  border-radius: var(--radius-full);
  position: relative;
}

.scroll-indicator-icon::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: currentColor;
  border-radius: var(--radius-full);
  animation: scroll-dot 2s infinite;
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  40% {
    transform: translateX(-50%) translateY(-10px);
  }

  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

@keyframes scroll-dot {
  0% {
    opacity: 1;
    top: 8px;
  }

  100% {
    opacity: 0;
    top: 20px;
  }
}


/* ============================================
   Specific Overrides for Problem Section
   ============================================ */
#problem .section-title,
#problem h3,
#problem .section-subtitle {
  color: #ffffff;
}

/* ============================================
   7. Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px var(--color-accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-btn-outline);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   8. Cards
   ============================================ */
.card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .card {
  border-color: rgba(0, 0, 0, 0.08);
  /* Lighter border for light mode */
}

.card:hover {
  background: var(--color-bg-glass);
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-glass {
  background: var(--gradient-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.card-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 168, 255, 0.1);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  color: var(--color-accent);
  font-size: var(--font-size-2xl);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* ============================================
   9. Stats / Benefits Grid
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-xl);
}

.stat-value {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ============================================
   10. Timeline
   ============================================ */
.timeline {
  position: relative;
  padding-left: var(--spacing-3xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-2xl);
  opacity: 0;
  transform: translateX(-20px);
  transition: all var(--transition-slow);
}

.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--spacing-3xl) - 5px);
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: var(--shadow-glow);
}

.timeline-year {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.timeline-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

.timeline-content p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.timeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* ============================================
   10.5 Dual History Grid
   ============================================ */
.dual-history-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
}

.history-scroll-area {
  position: relative;
  /* Default for mobile: no scroll or auto height */
}

/* Scrollbar Styling for Webkit */
.history-scroll-area::-webkit-scrollbar {
  width: 6px;
}

.history-scroll-area::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.history-scroll-area::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: 4px;
}

@media (min-width: 992px) {
  .dual-history-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: var(--spacing-3xl);
  }

  .history-scroll-area {
    max-height: 600px;
    /* Adjust height as needed */
    overflow-y: auto;
    padding-right: var(--spacing-md);
    /* Space for scrollbar */
    padding-left: var(--spacing-sm);
  }

  .sticky-header {
    position: sticky;
    top: 0;
    z-index: 10;
    padding-bottom: var(--spacing-md);
    /* Ensure header contrasts if content scrolls behind it */
    background: linear-gradient(to bottom, var(--color-bg-primary) 80%, transparent);
  }

  [data-theme="dark"] .sticky-header {
    background: linear-gradient(to bottom, var(--color-bg-primary) 80%, transparent);
  }
}

.timeline-list li {
  position: relative;
  padding-left: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.timeline-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ============================================
   11. Gallery / Carousel
   ============================================ */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

/* Applications Grid - More compact for multiple images */
.gallery-grid.applications-grid {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.gallery-item {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 50%);
  display: flex;
  align-items: flex-end;
  padding: var(--spacing-lg);
  opacity: 0;
  transition: opacity var(--transition-base);
  color: #ffffff;
}

.gallery-item:hover .gallery-item-overlay {
  opacity: 1;
}

/* Scroll Carousel */
.scroll-carousel {
  position: relative;
  width: 100%;
  overflow: hidden;
  overflow-y: auto;
  /* Allow vertical scroll if needed */
}

.scroll-carousel-track {
  display: grid;
  grid-template-areas: "stack";
  width: 100%;
  height: 100%;
}

.scroll-carousel-slide {
  grid-area: stack;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity var(--transition-slow);
  z-index: 1;
}

.scroll-carousel-slide.active {
  opacity: 1;
  z-index: 2;
}

.carousel-indicators {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 3;
}

.indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(2px);
  transition: all var(--transition-fast);
}

.indicator.active {
  background: #fff;
  transform: scale(1.2);
}

/* Background Fade Effect */
.bg-fade-container {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.bg-fade-image {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--transition-slower);
}

.bg-fade-image.active {
  opacity: 1;
}

.bg-fade-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================
   11.5. YouTube Video Container
   ============================================ */
.youtube-video-container {
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-xl);
}

.youtube-video-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  /* 16:9 aspect ratio */
  background: var(--color-bg-secondary);
}

.youtube-video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.hero .youtube-video-container {
  max-width: 700px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* Video Background Mode */
.video-bg-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.video-bg-container::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(10, 10, 10, 0.4) 0%, rgba(10, 10, 10, 0.7) 100%);
  z-index: 1;
}

.video-bg-container iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100vw;
  height: 56.25vw;
  /* 16:9 aspect ratio */
  min-height: 100%;
  min-width: 177.78vh;
  /* 16:9 aspect ratio */
  transform: translate(-50%, -50%);
  border: none;
  pointer-events: none;
}

/* Ensure section content is above background video */
.section .container {
  position: relative;
  z-index: 2;
}

/* ============================================
   12. Partners Logo Grid
   ============================================ */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-2xl);
  align-items: center;
}

.partner-logo {
  height: 60px;
  /* Slightly larger for better visibility */
  filter: none;
  opacity: 1;
  transition: all var(--transition-base);
}

.partner-logo:hover {
  transform: scale(1.1);
}

/* Auto-scroll Logo Carousel */
.logo-carousel {
  overflow: hidden;
  position: relative;
  padding: var(--spacing-xl) 0;
}

.logo-carousel-track {
  display: flex;
  gap: var(--spacing-3xl);
  animation: logo-scroll 30s linear infinite;
}

.logo-carousel-track:hover {
  animation-play-state: paused;
}

@keyframes logo-scroll {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(-50%);
  }
}

/* ============================================
   13. Project Cards
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project-card-image {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}

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

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

.project-card-content {
  padding: var(--spacing-xl);
}

.project-card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.project-card-location {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

.project-card-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

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

/* ============================================
   14. Contact Section
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 168, 255, 0.1);
  border-radius: var(--radius-lg);
  color: var(--color-accent);
  flex-shrink: 0;
}

.contact-item-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.contact-item-value {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
}

/* Maps Grid */
.maps-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.map-container {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.map-container iframe {
  width: 100%;
  height: 300px;
  border: none;
}

.map-label {
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

.form-input,
.form-textarea {
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* ============================================
   15. Footer
   ============================================ */
.footer {
  background: var(--color-bg-secondary);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.footer-logo img {
  height: 40px;
}

.footer-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.footer-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.email-disclaimer {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-md);
}

/* ============================================
   16. Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-50px);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(50px);
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* ============================================
   17. Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-accent {
  color: var(--color-accent);
}

.text-muted {
  color: var(--color-text-muted);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.mb-2xl {
  margin-bottom: var(--spacing-2xl);
}

.mb-3xl {
  margin-bottom: var(--spacing-3xl);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

/* ============================================
   17.5 Button Sizes
   ============================================ */
.btn-sm {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-base);
}

/* ============================================
   17.6 Nano Page Styles
   ============================================ */
.page-hero {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--gradient-hero);
  overflow: hidden;
  padding-top: 100px;
}

.page-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.page-hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(10, 10, 10, 0.5) 0%, rgba(10, 10, 10, 0.9) 100%);
}

.page-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: 0 var(--spacing-xl);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
  transition: color var(--transition-fast);
}

.back-link:hover {
  color: var(--color-accent);
}

.back-link i {
  transition: transform var(--transition-fast);
}

.back-link:hover i {
  transform: translateX(-4px);
}

/* Content Grid */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.content-grid.reverse {
  direction: rtl;
}

.content-grid.reverse>* {
  direction: ltr;
}

.content-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.section-text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.content-image {
  aspect-ratio: 4/3;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.image-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: var(--spacing-xl);
  color: var(--color-text-muted);
  text-align: center;
}

.image-placeholder i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

/* Feature List */
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.feature-list li {
  position: relative;
  padding-left: var(--spacing-xl);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* Benefits Grid */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.benefit-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
}

.benefit-card:hover {
  background: var(--color-bg-glass);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-4px);
}

.benefit-icon {
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 168, 255, 0.1);
  border-radius: var(--radius-lg);
  margin: 0 auto var(--spacing-lg);
  color: var(--color-accent);
  font-size: var(--font-size-2xl);
}

.benefit-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.benefit-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

/* CTA Box */
.cta-box {
  background: var(--gradient-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-3xl);
  text-align: center;
}

.cta-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.cta-text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   17.7 Nano Page Specific Styles
   ============================================ */
#nanoApplication .section-title {
  color: #ffffff;
}

.section-subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  text-align: center;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-description {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Nano Stats Grid */
.nano-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.nano-stat-card {
  background: var(--gradient-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
}

.nano-stat-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.nano-stat-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 168, 255, 0.15);
  border-radius: var(--radius-lg);
  margin: 0 auto var(--spacing-lg);
  color: var(--color-accent);
  font-size: var(--font-size-2xl);
}

.nano-stat-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: #000000;
}

.nano-stat-list {
  list-style: none;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.nano-stat-list li {
  position: relative;
  padding-left: var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: #000000;
  line-height: var(--line-height-relaxed);
}

.nano-stat-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.nano-stat-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.nano-stat-desc {
  font-size: var(--font-size-sm);
  color: #000000;
}

/* Application Grid */
.application-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-lg);
}

.application-card {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.application-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.application-image {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--color-bg-secondary);
}

.application-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.application-card:hover .application-image img {
  transform: scale(1.1);
}

.application-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(0, 168, 255, 0.1) 0%, rgba(10, 10, 10, 0.5) 100%);
  color: var(--color-accent);
  font-size: var(--font-size-3xl);
}

.application-content {
  padding: var(--spacing-md);
  text-align: center;
}

.application-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
}

/* ============================================
   18. Responsive Design
   ============================================ */
@media (max-width: 1199px) {
  :root {
    --font-size-7xl: 3.5rem;
    --font-size-6xl: 3rem;
    --font-size-5xl: 2.5rem;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nano-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .application-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
  }
}

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

  .maps-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 767px) {
  :root {
    --font-size-7xl: 2.5rem;
    --font-size-6xl: 2rem;
    --font-size-5xl: 1.75rem;
    --font-size-4xl: 1.5rem;
    --container-padding: 1rem;
  }

  .navbar-menu {
    display: none;
  }

  .navbar-toggle {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  .mobile-menu-overlay {
    display: block;
  }

  .hero-title {
    font-size: var(--font-size-5xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .benefits-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .content-grid.reverse {
    direction: ltr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .nano-stats-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .application-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .section {
    padding: var(--spacing-3xl) 0;
  }

  /* Faster logo scroll on mobile (4x speed) */
  .logo-carousel-track {
    animation-duration: 7.5s;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-7xl: 2rem;
    --font-size-6xl: 1.75rem;
  }

  .btn {
    width: 100%;
  }
}

/* ============================================
   19. Print Styles
   ============================================ */
@media print {

  .navbar,
  .scroll-indicator,
  .footer {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .section {
    page-break-inside: avoid;
  }
}

/* Background Video Container */
.video-bg-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.video-bg-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  pointer-events: none;
  transform: scale(1.5);
  transform-origin: center center;
}

.video-bg-container::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  /* Simple dark overlay */
  z-index: 1;
}

#solutionGallery {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 1024px) {
  #solutionGallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  #solutionGallery {
    grid-template-columns: 1fr;
  }
}

#solutionGallery .gallery-item {
  max-height: 500px !important;
  aspect-ratio: auto;
}

#solutionGallery .gallery-item img {
  object-fit: contain;
  background: #000;
}

/* ============================================
   20. Technology Table Styles
   ============================================ */
.table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--color-bg-card);
}

.tech-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 800px;
  /* Ensure table doesn't squish too much on mobile */
  font-size: var(--font-size-sm);
}

.tech-table th,
.tech-table td {
  padding: 1rem;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.1);
  vertical-align: middle;
}

.tech-table th {
  background: rgba(0, 168, 255, 0.1);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-bold);
  white-space: nowrap;
}

/* Green Highlight for Dongshin Column Header */
.tech-table th.highlight-header {
  background: #008000;
  color: white;
}

.tech-table td {
  color: var(--color-text-secondary);
}

/* Highlighted cells (Dongshin column body) */
.tech-table td.highlight-cell {
  background: rgba(0, 128, 0, 0.1);
  color: var(--color-text-primary);
  font-weight: bold;
}

/* Text highlights (blue text in image) */
.tech-table td.highlight-text {
  color: #4da6ff;
  font-weight: bold;
}



.tech-table th,
.tech-table td {
  padding: 0.75rem;
  font-size: var(--font-size-xs);
}

/* ============================================
   21. Technology Background Cards
   ============================================ */
.card-bg-image {
  background-size: cover !important;
  background-position: center !important;
  position: relative;
  overflow: hidden;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.card-bg-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  /* Dark overlay for readability */
  z-index: 1;
  transition: background var(--transition-base);
}

.card-bg-image:hover::before {
  background: rgba(0, 0, 0, 0.3);
  /* Lighter overlay on hover */
}

/* Disable lift/zoom effect on hover for these specific cards if desired, 
   or just ensure no scaling */
.card-bg-image:hover {
  transform: none !important;
  background-size: cover !important;
  background-position: center !important;
}

.card-bg-image>* {
  position: relative;
  z-index: 2;
}

.card-bg-image .card-text {
  color: rgba(255, 255, 255, 0.8);
}

.card-bg-image .card-icon {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-accent);
}

/* ============================================
   22. Technology Test Report Gallery
   ============================================ */
#technologyGallery {
  grid-template-columns: repeat(6, 1fr);
  gap: var(--spacing-sm);
}

#technologyGallery .gallery-item {
  aspect-ratio: 9/16;
  max-height: none;
  /* Override any previous constraints */
}

#technologyGallery .gallery-item img {
  object-fit: cover;
  width: 100%;
  height: 100%;
}

@media (max-width: 1024px) {
  #technologyGallery {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 767px) {
  #technologyGallery {
    grid-template-columns: repeat(2, 1fr);
  }

  .tech-table th,
  .tech-table td {
    white-space: nowrap;
  }
}

/* ============================================
   23. Specific Button Overrides
   ============================================ */
#nanoDetailBtn {
  color: #ffffff !important;
  border-color: #ffffff !important;
}

#nanoDetailBtn:hover {
  background: rgba(255, 255, 255, 0.2) !important;
  color: #ffffff !important;
}