/**
 * ============================================================================
 * AI GEOPOLITICS - ADDITIONAL SHARED STYLES
 * ============================================================================
 * Additional styles beyond the design system for specific project needs.
 * 
 * Contents:
 * - Scroll behavior enhancements
 * - Selection colors
 * - Focus states
 * - Print styles
 * - Project-specific utility classes
 * - Section-specific patterns
 * ============================================================================
 */

/* ==========================================================================
   SCROLL BEHAVIOR
   ========================================================================== */

/* Smooth scroll with fallback */
html {
  scroll-behavior: smooth;
}

/* Fallback tokens for module-level effects that still use legacy names */
:root {
  --color-tech-cyan: #06b6d4;
  --color-power-purple: #8b5cf6;
  --color-accent-primary: var(--color-secondary-500, #ea580c);
  --font-display: var(--font-heading, "Playfair Display", Georgia, serif);
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
  --shadow-glow-cyan: 0 0 0 1px rgba(6, 182, 212, 0.35), 0 10px 30px rgba(6, 182, 212, 0.22);
}

/* Hide scrollbar but keep functionality (optional) */
.hide-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.hide-scrollbar::-webkit-scrollbar {
  display: none;
}

/* Custom scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* ==========================================================================
   SELECTION COLORS
   ========================================================================== */

::selection {
  background: rgba(6, 182, 212, 0.3);
  color: var(--color-text-primary);
}

::-moz-selection {
  background: rgba(6, 182, 212, 0.3);
  color: var(--color-text-primary);
}

/* ==========================================================================
   FOCUS STATES
   ========================================================================== */

/* Enhanced focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-tech-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Skip link styling */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  padding: var(--space-3) var(--space-6);
  background: var(--color-text-primary);
  color: var(--color-bg-primary);
  font-weight: 500;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: var(--space-4);
}

/* ==========================================================================
   PRINT STYLES
   ========================================================================== */

@media print {
  /* Hide interactive elements */
  nav,
  #main-nav,
  #mobile-menu,
  #back-to-top,
  .no-print,
  button,
  .btn {
    display: none !important;
  }

  /* Reset backgrounds and colors for printing */
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  /* Ensure text is readable */
  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  /* Page breaks */
  h1, h2, h3 {
    page-break-after: avoid;
  }

  p, li {
    page-break-inside: avoid;
  }

  /* Show URLs for links */
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  /* Don't show URLs for internal anchors */
  a[href^="#"]::after {
    content: "";
  }

  /* Ensure images don't break across pages */
  img {
    page-break-inside: avoid;
    max-width: 100% !important;
  }

  /* Add page margins */
  @page {
    margin: 2cm;
  }
}

/* ==========================================================================
   PROJECT-SPECIFIC UTILITY CLASSES
   ========================================================================== */

/* Glass morphism effect */
.glass {
  background: rgba(18, 18, 26, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.glass-light {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Glow effects */
.glow-cyan {
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.3);
}

.glow-purple {
  box-shadow: 0 0 30px rgba(139, 92, 246, 0.3);
}

.glow-red {
  box-shadow: 0 0 30px rgba(220, 38, 38, 0.3);
}

.glow-blue {
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

/* Text glow */
.text-glow-cyan {
  text-shadow: 0 0 20px rgba(6, 182, 212, 0.5);
}

.text-glow-purple {
  text-shadow: 0 0 20px rgba(139, 92, 246, 0.5);
}

/* Border gradients */
.border-gradient {
  position: relative;
}

.border-gradient::before {
  content: '';
  position: absolute;
  inset: 0;
  padding: 1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--color-tech-cyan), var(--color-power-purple));
  -webkit-mask: 
    linear-gradient(#fff 0 0) content-box, 
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* Gradient backgrounds */
.bg-gradient-radial {
  background: radial-gradient(ellipse at center, var(--color-bg-secondary) 0%, var(--color-bg-primary) 70%);
}

.bg-gradient-mesh {
  background: 
    radial-gradient(at 40% 20%, rgba(6, 182, 212, 0.1) 0px, transparent 50%),
    radial-gradient(at 80% 0%, rgba(139, 92, 246, 0.1) 0px, transparent 50%),
    radial-gradient(at 0% 50%, rgba(59, 130, 246, 0.05) 0px, transparent 50%),
    var(--color-bg-primary);
}

/* Noise texture overlay */
.noise-overlay {
  position: relative;
}

.noise-overlay::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
  mix-blend-mode: overlay;
}

/* Line decorations */
.line-decoration {
  position: relative;
}

.line-decoration::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-tech-cyan), var(--color-power-purple));
  border-radius: var(--radius-full);
}

/* ==========================================================================
   SECTION-SPECIFIC PATTERNS
   ========================================================================== */

/* Hero section specific */
.hero-gradient {
  background: linear-gradient(
    180deg,
    var(--color-bg-primary) 0%,
    rgba(18, 18, 26, 0.8) 50%,
    var(--color-bg-primary) 100%
  );
}

.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 120%;
  background-image: url('../images/hero-background.jpg');
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(15,23,42,0.7) 0%, rgba(15,23,42,0.85) 50%, rgba(15,23,42,0.95) 100%);
  z-index: 1;
}

.hero-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(59,130,246,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: 1400px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #60a5fa;
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
}

.hero-badge i {
  width: 14px;
  height: 14px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.1;
  color: #f8fafc;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-title-line {
  display: block;
  opacity: 0;
  transform: translateY(40px);
  clip-path: inset(100% 0 0 0);
}

.hero-title-accent {
  background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 50%, #22d3ee 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 400;
  font-style: italic;
  color: #94a3b8;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(30px);
}

.hero-statement {
  max-width: 800px;
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.8;
  color: #94a3b8;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(30px);
}

.hero-statement strong {
  color: #f8fafc;
  font-weight: 600;
}

.core-question-box {
  position: relative;
  max-width: 900px;
  padding: 2rem 3rem;
  margin-bottom: 3rem;
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 1rem;
  backdrop-filter: blur(10px);
  opacity: 0;
  transform: translateY(30px) scale(0.95);
}

.core-question-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #3b82f6, transparent);
  border-radius: 1rem 1rem 0 0;
}

.core-question-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #3b82f6;
  margin-bottom: 1rem;
}

.core-question-text {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 500;
  line-height: 1.5;
  color: #f8fafc;
}

.hero-instructors {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(20px);
}

.instructor-avatars {
  display: flex;
}

.instructor-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
  border: 2px solid #0f172a;
  margin-left: -8px;
}

.instructor-avatar:first-child {
  margin-left: 0;
}

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

.instructor-label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #64748b;
}

.instructor-names {
  font-size: 0.9rem;
  font-weight: 500;
  color: #94a3b8;
}

.course-preview {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(20px);
}

.course-unit {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 0.5rem;
  font-size: 0.85rem;
  color: #94a3b8;
  transition: all 0.3s ease;
}

.course-unit:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
}

.course-unit-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: rgba(59, 130, 246, 0.2);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  color: #60a5fa;
}

.key-themes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(20px);
}

.theme-tag {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 500;
  color: #a78bfa;
  transition: all 0.3s ease;
}

.theme-tag:hover {
  background: rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.5);
}

.theme-tag i {
  width: 14px;
  height: 14px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  border: none;
  border-radius: 9999px;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
  opacity: 0;
  transform: translateY(20px);
  text-decoration: none;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.5);
}

.hero-cta i {
  width: 18px;
  height: 18px;
  transition: transform 0.3s ease;
}

.hero-cta:hover i {
  transform: translateX(4px);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 10;
  opacity: 0;
}

.scroll-indicator-text {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #64748b;
}

.scroll-indicator-icon {
  width: 24px;
  height: 40px;
  border: 2px solid rgba(148, 163, 184, 0.3);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.scroll-indicator-dot {
  width: 4px;
  height: 8px;
  background: #3b82f6;
  border-radius: 2px;
  animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(8px); opacity: 0.5; }
}

@media (max-width: 768px) {
  .hero-content {
    padding: 1.5rem;
  }

  .core-question-box {
    padding: 1.5rem;
  }

  .course-preview {
    flex-direction: column;
    align-items: stretch;
  }

  .course-unit {
    justify-content: flex-start;
  }

  .scroll-indicator {
    bottom: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .core-question-box {
    padding: 1.25rem;
  }

  .hero-cta {
    padding: 0.875rem 2rem;
    font-size: 0.9rem;
  }
}

/* ==========================================================================
   CHAPTER RAIL
   ========================================================================== */
.chapter-rail {
  position: relative;
  width: 100%;
  height: 18px;
  z-index: 20;
  --chapter-rail-dot-span: 100%;
}

.chapter-rail__track {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  width: 100%;
  background: rgba(148, 163, 184, 0.2);
  border-radius: 999px;
  overflow: hidden;
  pointer-events: none;
}

.chapter-rail__progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #22d3ee 0%, #8b5cf6 100%);
  transition: width 60ms linear;
  pointer-events: none;
}

.chapter-rail__list {
  list-style: none;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  width: var(--chapter-rail-dot-span);
  margin: 0;
  margin-right: auto;
  padding: 0;
  position: relative;
  z-index: 1;
}

.chapter-rail__link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 9999px;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.chapter-rail__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(148, 163, 184, 0.5);
  box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.75);
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  pointer-events: none;
}

.chapter-rail__label {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #94a3b8;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.2);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.chapter-rail__link:hover .chapter-rail__dot,
.chapter-rail__link.is-active .chapter-rail__dot {
  background: #22d3ee;
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.2);
  transform: scale(1.28);
}

.chapter-rail__link:hover {
  transform: translateY(-1px);
}

.chapter-rail__link:focus-visible {
  outline: 2px solid rgba(34, 211, 238, 0.8);
  outline-offset: 2px;
}

.chapter-rail__link:hover .chapter-rail__label,
.chapter-rail__link.is-active .chapter-rail__label {
  color: #e2e8f0;
  border-color: rgba(34, 211, 238, 0.4);
  background: rgba(15, 23, 42, 0.85);
}

.chapter-rail--header {
  max-width: 520px;
  margin: 0 1.25rem;
}

.chapter-rail--header .chapter-rail__label {
  display: none;
}

@media (max-width: 1024px) {
  .chapter-rail--header {
    display: none;
  }
}

#main-content {
  padding-top: 64px;
}

/* ==========================================================================
   CONTRAST FIXES FOR DARK SURFACES
   ========================================================================== */
:where(.text-white) {
  color: #f8fafc !important;
}

:where(.text-slate-100) { color: #f1f5f9 !important; }
:where(.text-slate-200) { color: #e2e8f0 !important; }
:where(.text-slate-300) { color: #cbd5e1 !important; }
:where(.text-slate-400) { color: #94a3b8 !important; }
:where(.text-slate-500) { color: #64748b !important; }

:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) {
  color: #e2e8f0;
}

:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .heading-1,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .heading-2,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .heading-3,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .heading-4,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .heading-5,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .heading-6 {
  color: #f8fafc !important;
}

:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .text-slate-600,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .text-slate-700,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .text-slate-800,
:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .text-slate-900 {
  color: #e2e8f0 !important;
}

:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .text-slate-300 {
  color: #e2e8f0 !important;
}

:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .text-slate-400 {
  color: #cbd5e1 !important;
}

:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .text-slate-500 {
  color: #94a3b8 !important;
}

:where(
  [class*="bg-slate-8"],
  [class*="bg-slate-9"],
  [class*="from-slate-8"],
  [class*="from-slate-9"],
  [class*="via-slate-8"],
  [class*="via-slate-9"],
  [class*="to-slate-8"],
  [class*="to-slate-9"]
) .source-number {
  color: var(--color-secondary-300) !important;
}

/* Ensure heading color utilities win over design-system defaults */
.heading-1.text-white,
.heading-2.text-white,
.heading-3.text-white,
.heading-4.text-white,
.heading-5.text-white,
.heading-6.text-white {
  color: #f8fafc !important;
}

/* Week section headers */
.week-header {
  position: relative;
  padding: var(--space-8) 0;
}

.week-number {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-tech-cyan);
}

.week-title {
  font-size: var(--text-4xl);
  margin-top: var(--space-4);
  margin-bottom: var(--space-6);
}

/* Part/Chapter styling */
.part-marker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.part-marker::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-accent-primary);
  border-radius: 50%;
}

/* Timeline styling */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(
    180deg,
    #f97316 0%,
    #14b8a6 55%,
    #6366f1 100%
  );
  border-radius: 9999px;
  opacity: 0.95;
}

.timeline .timeline-item {
  position: relative;
  padding-bottom: var(--space-8);
}

.timeline .timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) + 2px);
  top: var(--space-2);
  width: 10px;
  height: 10px;
  background: var(--color-bg-primary);
  border: 2px solid #f97316;
  border-radius: 50%;
}

.timeline-year {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-tech-cyan);
  margin-bottom: var(--space-2);
}

/* Data visualization cards */
.data-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.data-card:hover {
  border-color: var(--color-tech-cyan);
  box-shadow: var(--shadow-glow-cyan);
}

.data-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--color-text-primary);
}

.data-label {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

/* ==========================================================================
   INTERACTIVE ELEMENTS
   ========================================================================== */

/* Hover lift effect */
.hover-lift {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* Magnetic button effect base */
.magnetic-btn {
  transition: transform 0.1s ease-out;
}

/* Link underline animation */
.link-underline {
  position: relative;
  text-decoration: none;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width var(--transition-base);
}

.link-underline:hover::after {
  width: 100%;
}

/* Image hover zoom */
.img-zoom {
  overflow: hidden;
}

.img-zoom img {
  transition: transform var(--transition-slow);
}

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

/* ==========================================================================
   LOADING STATES
   ========================================================================== */

/* Skeleton loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 25%,
    var(--color-bg-elevated) 50%,
    var(--color-bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-bg-tertiary);
  border-top-color: var(--color-tech-cyan);
  border-radius: 50%;
  animation: spinner-rotate 1s linear infinite;
}

@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}

/* ==========================================================================
   ACCESSIBILITY ENHANCEMENTS
   ========================================================================== */

/* Screen reader only (visually hidden but accessible) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* High contrast mode adjustments */
@media (prefers-contrast: high) {
  .glass,
  .glass-light {
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-text-primary);
  }
  
  .border-gradient::before {
    display: none;
  }
  
  .border-gradient {
    border: 2px solid var(--color-tech-cyan);
  }
}

/* ==========================================================================
   RESPONSIVE UTILITIES
   ========================================================================== */

/* Container queries support (for modern browsers) */
@supports (container-type: inline-size) {
  .container-query {
    container-type: inline-size;
  }
  
  @container (min-width: 400px) {
    .cq-card {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: var(--space-4);
    }
  }
}

/* Aspect ratio utilities */
.aspect-video {
  aspect-ratio: 16 / 9;
}

.aspect-square {
  aspect-ratio: 1 / 1;
}

.aspect-portrait {
  aspect-ratio: 3 / 4;
}

/* Object fit utilities */
.object-cover {
  object-fit: cover;
}

.object-contain {
  object-fit: contain;
}

/* ==========================================================================
   DARK MODE (System Preference)
   ========================================================================== */

/* Our design is already dark-first, but we can add light mode support */
@media (prefers-color-scheme: light) {
  /* Uncomment to enable light mode
  :root {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-bg-tertiary: #e8e8ed;
    --color-bg-elevated: #ffffff;
    
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-text-tertiary: #6b6b6b;
    --color-text-muted: #999999;
    
    --border-color: rgba(0, 0, 0, 0.1);
  }
  */
}

/* ==========================================================================
   DEBUG UTILITIES (Development Only)
   ========================================================================== */

/* Visual grid overlay for alignment debugging */
.debug-grid {
  position: relative;
}

.debug-grid::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 0, 0, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 0, 0, 0.1) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
  z-index: 9999;
}

/* Outline all elements for debugging */
.debug-outline * {
  outline: 1px solid rgba(255, 0, 0, 0.3);
}