/* Dark theme (default) */
:root {
  --primary: #1a1a2e;
  --primary-light: #16213e;
  --accent-1: #7f5af0;
  --accent-2: #2cb67d;
  --accent-3: #00b4d8;
  --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-2: linear-gradient(135deg, #7f5af0 0%, #2cb67d 100%);
  --bg: #0d0d1a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-nav: rgba(26, 26, 46, 0.95);
  --text: #e0e0e0;
  --text-muted: #a0a0a0;
  --text-heading: white;
  --border: rgba(255, 255, 255, 0.08);
  --glow: rgba(127, 90, 240, 0.3);
  --code-bg: rgba(127, 90, 240, 0.15);
  --bg-gradient-1: rgba(127, 90, 240, 0.08);
  --bg-gradient-2: rgba(44, 182, 125, 0.06);
  --bg-gradient-3: rgba(0, 180, 216, 0.04);
}

/* Light theme */
[data-theme="light"] {
  --primary: #f0f4f8;
  --primary-light: #e2e8f0;
  --bg: #ffffff;
  --bg-card: rgba(99, 102, 241, 0.04);
  --bg-card-hover: rgba(99, 102, 241, 0.08);
  --bg-nav: rgba(255, 255, 255, 0.95);
  --text: #334155;
  --text-muted: #64748b;
  --text-heading: #1e293b;
  --border: rgba(99, 102, 241, 0.15);
  --code-bg: rgba(127, 90, 240, 0.1);
  --bg-gradient-1: rgba(127, 90, 240, 0.06);
  --bg-gradient-2: rgba(44, 182, 125, 0.05);
  --bg-gradient-3: rgba(0, 180, 216, 0.04);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

/* Animated background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 20%, var(--bg-gradient-1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, var(--bg-gradient-2) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, var(--bg-gradient-3) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
  transition: background 0.3s ease;
}

/* Navigation */
nav {
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

nav::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-2);
  opacity: 0.5;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative;
}

nav a:hover {
  color: var(--text-heading);
  background: var(--bg-card-hover);
}

nav a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-2);
  transition: all 0.3s ease;
  transform: translateX(-50%);
  border-radius: 2px;
}

nav a:hover::before {
  width: 80%;
}

/* Logo */
.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 1rem 0.4rem 0.4rem !important;
  margin-right: 1.5rem;
  border-radius: 16px !important;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(127, 90, 240, 0.05) 100%);
  border: 1px solid var(--border);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.logo-link::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(127, 90, 240, 0.1) 50%, rgba(44, 182, 125, 0.1) 100%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.logo-link:hover {
  background: linear-gradient(135deg, var(--bg-card-hover) 0%, rgba(127, 90, 240, 0.1) 100%);
  border-color: var(--accent-1);
  transform: translateY(-2px);
  box-shadow:
    0 8px 30px rgba(127, 90, 240, 0.2),
    0 4px 12px rgba(0, 0, 0, 0.1);
}

.logo-link:hover::after {
  opacity: 1;
}

.logo-link::before {
  display: none !important;
}

.logo-container {
  position: relative;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.logo {
  width: 48px;
  height: 48px;
}

.logo-text-container {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1.2;
}

.logo-text-main {
  font-weight: 800;
  font-size: 1.15rem;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.logo-text-sub {
  font-weight: 500;
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ===== Logo Animations ===== */

/* Background glow pulse */
.logo .bg-glow {
  animation: bgGlowPulse 4s ease-in-out infinite;
  transform-origin: center;
}

/* Cube rotation */
.logo .cube {
  animation: cubeFloat 6s ease-in-out infinite;
  transform-origin: center;
}

/* Camera rays scanning */
.logo .rays {
  animation: raysScan 3s ease-in-out infinite;
}

.logo .ray {
  stroke-dashoffset: 0;
  animation: rayDash 2s linear infinite;
}

.logo .r1 { animation-delay: 0s; }
.logo .r2 { animation-delay: 0.3s; }
.logo .r3 { animation-delay: 0.6s; }

/* Gaussian splats breathing */
.logo .splat {
  animation: splatBreathe 3s ease-in-out infinite;
  transform-origin: center;
}

.logo .s1 { animation-delay: 0s; }
.logo .s2 { animation-delay: 0.5s; }
.logo .s3 { animation-delay: 1s; }
.logo .s4 { animation-delay: 1.5s; }

/* Diffusion particles */
.logo .dp {
  animation: diffusionFloat 4s ease-in-out infinite;
}

.logo .dp1 { animation-delay: 0s; }
.logo .dp2 { animation-delay: 0.3s; }
.logo .dp3 { animation-delay: 0.6s; }
.logo .dp4 { animation-delay: 0.9s; }
.logo .dp5 { animation-delay: 1.2s; }
.logo .dp6 { animation-delay: 1.5s; }
.logo .dp7 { animation-delay: 1.8s; }
.logo .dp8 { animation-delay: 2.1s; }
.logo .dp9 { animation-delay: 2.4s; }

/* Core pulsing */
.logo .core-outer {
  animation: corePulse 2s ease-in-out infinite;
  transform-origin: center;
}

.logo .core-inner {
  animation: coreInnerPulse 2s ease-in-out infinite 0.3s;
  transform-origin: center;
}

/* Neural links */
.logo .neural-links {
  animation: neuralFade 3s ease-in-out infinite;
}

/* Orbit ring */
.logo .orbit {
  animation: orbitRotate 8s linear infinite;
  transform-origin: center;
  transform-box: fill-box;
}

/* Keyframes */
@keyframes bgGlowPulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.1); }
}

@keyframes cubeFloat {
  0%, 100% { transform: translateY(0) rotateY(0deg); opacity: 0.6; }
  50% { transform: translateY(-1px) rotateY(3deg); opacity: 0.8; }
}

@keyframes raysScan {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

@keyframes rayDash {
  from { stroke-dashoffset: 8; }
  to { stroke-dashoffset: 0; }
}

@keyframes splatBreathe {
  0%, 100% {
    transform: scale(1);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.15);
    opacity: 1;
  }
}

@keyframes diffusionFloat {
  0%, 100% {
    transform: translateY(0) scale(1);
    opacity: 0.6;
  }
  25% {
    transform: translateY(-3px) scale(1.2);
    opacity: 1;
  }
  75% {
    transform: translateY(2px) scale(0.8);
    opacity: 0.4;
  }
}

@keyframes corePulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.1); opacity: 1; }
}

@keyframes coreInnerPulse {
  0%, 100% { transform: scale(1); opacity: 0.9; }
  50% { transform: scale(1.2); opacity: 1; }
}

@keyframes neuralFade {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}

@keyframes orbitRotate {
  from { transform: rotate(-20deg); }
  to { transform: rotate(340deg); }
}

/* Hover effects - intensify animations */
.logo-link:hover .logo .bg-glow {
  animation: bgGlowPulseHover 1.5s ease-in-out infinite;
}

.logo-link:hover .logo .splat {
  animation: splatBreatheHover 1.5s ease-in-out infinite;
}

.logo-link:hover .logo .core-outer {
  animation: corePulseHover 1s ease-in-out infinite;
}

.logo-link:hover .logo .dp {
  animation: diffusionFloatHover 2s ease-in-out infinite;
}

@keyframes bgGlowPulseHover {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.15); }
}

@keyframes splatBreatheHover {
  0%, 100% { transform: scale(1); opacity: 0.9; }
  50% { transform: scale(1.25); opacity: 1; }
}

@keyframes corePulseHover {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 1; }
}

@keyframes diffusionFloatHover {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.8; }
  50% { transform: translateY(-5px) scale(1.3); opacity: 1; }
}

/* Theme toggle button */
.theme-toggle {
  margin-left: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  color: var(--text-muted);
  font-size: 1.2rem;
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-1);
  color: var(--accent-1);
  transform: rotate(15deg);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Dark mode: show sun icon */
.theme-toggle .icon-sun {
  display: block;
}
.theme-toggle .icon-moon {
  display: none;
}

/* Light mode: show moon icon */
[data-theme="light"] .theme-toggle .icon-sun {
  display: none;
}
[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

/* Main content */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 2rem;
  min-height: calc(100vh - 140px);
}

/* Hero title */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  position: relative;
}

h1::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 3px;
  background: var(--gradient-2);
  border-radius: 3px;
}

/* Section headers */
h2 {
  color: var(--text-heading);
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border-radius: 12px;
  border-left: 4px solid var(--accent-1);
  backdrop-filter: blur(10px);
  transition: background 0.3s ease, color 0.3s ease;
}

h2:nth-of-type(2) {
  border-left-color: var(--accent-2);
}

h2:nth-of-type(3) {
  border-left-color: var(--accent-3);
}

h2:nth-of-type(4) {
  border-left-color: #f97316;
}

/* Topic cards */
h3 {
  color: var(--accent-3);
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

[data-theme="light"] h3 {
  color: #0891b2;
}

/* Content paragraphs as cards */
h3 + p {
  background: var(--bg-card);
  padding: 1rem 1.25rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  transition: all 0.3s ease;
}

h3 + p:hover {
  background: var(--bg-card-hover);
  border-color: rgba(127, 90, 240, 0.2);
  transform: translateX(4px);
}

/* Course info box */
main > p:first-of-type,
main > p:nth-of-type(2) {
  display: inline-block;
}

/* Links */
a {
  color: var(--accent-1);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-2);
}

/* Strong/bold text */
strong {
  color: var(--text-heading);
  font-weight: 600;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

th, td {
  padding: 1rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--gradient-1);
  color: white;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: var(--bg-card-hover);
}

/* Horizontal rules */
hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 3rem 0;
}

/* Code blocks */
code {
  background: var(--code-bg);
  color: var(--accent-1);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9em;
}

pre {
  background: var(--primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  overflow-x: auto;
  transition: background 0.3s ease, border-color 0.3s ease;
}

pre code {
  background: none;
  padding: 0;
  color: var(--text);
}

/* Lists */
ul, ol {
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

li::marker {
  color: var(--accent-1);
}

/* Footer */
footer {
  background: var(--primary);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  text-align: center;
  padding: 2rem;
  margin-top: 2rem;
  transition: background 0.3s ease, border-color 0.3s ease;
}

footer p {
  margin: 0;
  font-size: 0.9rem;
}

/* Blockquotes */
blockquote {
  border-left: 3px solid var(--accent-2);
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border-radius: 0 10px 10px 0;
  font-style: italic;
  color: var(--text-muted);
  transition: background 0.3s ease;
}

/* Selection */
::selection {
  background: rgba(127, 90, 240, 0.3);
  color: white;
}

[data-theme="light"] ::selection {
  color: #1e293b;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-1);
}

/* Responsive */
@media (max-width: 768px) {
  main {
    padding: 2rem 1rem;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.25rem;
    padding: 0.75rem 1rem;
  }

  nav {
    padding: 0.75rem 1rem;
  }

  nav a {
    font-size: 0.85rem;
    padding: 0.4rem 0.6rem;
  }

  .theme-toggle {
    width: 36px;
    height: 36px;
  }

  .logo-link {
    padding: 0.3rem 0.6rem 0.3rem 0.3rem !important;
    margin-right: 0.75rem;
    gap: 0.5rem;
    border-radius: 12px !important;
  }

  .logo-container {
    width: 36px;
    height: 36px;
  }

  .logo {
    width: 36px;
    height: 36px;
  }

  .logo-text-main {
    font-size: 0.95rem;
  }

  .logo-text-sub {
    font-size: 0.55rem;
  }
}

@media (max-width: 480px) {
  .logo-text-sub {
    display: none;
  }

  .logo-link {
    padding: 0.25rem !important;
    margin-right: 0.5rem;
  }

  .logo-text-main {
    font-size: 0.9rem;
  }
}

/* Subtle animation for cards */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main > * {
  animation: fadeIn 0.5s ease forwards;
}

/* Disabled / coming-soon links */
.disabled-link {
  color: var(--text-muted);
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

/* Emphasis styling */
em {
  color: var(--accent-2);
  font-style: normal;
  font-weight: 500;
}

[data-theme="light"] em {
  color: #059669;
}

/* ===== Site Header (Index page) ===== */
.site-header {
  text-align: center;
  margin-bottom: 2rem;
}

.site-title {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0 0 0.5rem 0;
  padding: 0;
  line-height: 1.3;
}

.site-title::after {
  display: none;
}

.site-affiliation {
  font-size: 1rem;
  color: var(--text-muted);
  margin: 0;
  font-weight: 500;
  letter-spacing: 0.5px;
}

@media (max-width: 768px) {
  .site-title {
    font-size: 1.5rem;
  }

  .site-affiliation {
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .site-title {
    font-size: 1.25rem;
  }

  .site-affiliation {
    font-size: 0.8rem;
  }
}

/* ===== Hero Section ===== */
.hero-section {
  position: relative;
  width: 100%;
  margin-bottom: 2rem;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(127, 90, 240, 0.05) 50%, rgba(44, 182, 125, 0.03) 100%);
  border: 1px solid var(--border);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.1),
    0 0 80px rgba(127, 90, 240, 0.05) inset;
}

.hero-illustration {
  width: 100%;
  height: auto;
  min-height: 200px;
  max-height: 320px;
  display: block;
}

.hero-title-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2rem;
  background: linear-gradient(to top, var(--bg) 0%, transparent 100%);
  text-align: center;
  pointer-events: none;
}

.hero-title {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0 0 0.5rem 0;
  padding: 0;
  border: none;
  text-shadow: none;
  line-height: 1.3;
}

.hero-title::after {
  display: none;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  margin: 0;
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* Hero section labels */
.hero-section-label {
  font-family: 'Inter', sans-serif;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* Hero animations */
.hero-illustration .noise {
  animation: heroNoiseDrift 4s ease-in-out infinite;
}

.hero-illustration .noise:nth-child(odd) {
  animation-direction: reverse;
}

.hero-illustration .noise.n1 { animation-delay: 0s; }
.hero-illustration .noise.n2 { animation-delay: 0.2s; }
.hero-illustration .noise.n3 { animation-delay: 0.4s; }
.hero-illustration .noise.n4 { animation-delay: 0.6s; }
.hero-illustration .noise.n5 { animation-delay: 0.8s; }
.hero-illustration .noise.n6 { animation-delay: 1s; }
.hero-illustration .noise.n7 { animation-delay: 1.2s; }
.hero-illustration .noise.n8 { animation-delay: 1.4s; }
.hero-illustration .noise.n9 { animation-delay: 1.6s; }
.hero-illustration .noise.n10 { animation-delay: 1.8s; }

@keyframes heroNoiseDrift {
  0%, 100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.3;
  }
  25% {
    transform: translate(5px, -8px) scale(1.2);
    opacity: 0.6;
  }
  50% {
    transform: translate(-3px, 5px) scale(0.8);
    opacity: 0.2;
  }
  75% {
    transform: translate(8px, 3px) scale(1.1);
    opacity: 0.5;
  }
}

/* Forming shapes animation */
.hero-illustration .forming-shape {
  animation: heroFormPulse 3s ease-in-out infinite;
}

.hero-illustration .fs1 { animation-delay: 0s; }
.hero-illustration .fs2 { animation-delay: 0.3s; }
.hero-illustration .fs3 { animation-delay: 0.6s; }
.hero-illustration .fs4 { animation-delay: 0.9s; }
.hero-illustration .fs5 { animation-delay: 1.2s; }

@keyframes heroFormPulse {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.05); opacity: 1; }
}

/* Neural network animations */
.hero-illustration .nn-node {
  animation: heroNodePulse 2s ease-in-out infinite;
}

.hero-illustration .input-layer .nn-node { animation-delay: 0s; }
.hero-illustration .hidden-layer-1 .nn-node { animation-delay: 0.3s; }
.hero-illustration .hidden-layer-2 .nn-node { animation-delay: 0.6s; }
.hero-illustration .output-layer .nn-node { animation-delay: 0.9s; }

@keyframes heroNodePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

.hero-illustration .nn-conn {
  animation: heroConnPulse 3s ease-in-out infinite;
}

@keyframes heroConnPulse {
  0%, 100% { opacity: 0.3; stroke-width: 0.5; }
  50% { opacity: 0.7; stroke-width: 1; }
}

/* Camera rays animation */
.hero-illustration .ray {
  stroke-dashoffset: 0;
  animation: heroRayDash 1.5s linear infinite;
}

@keyframes heroRayDash {
  from { stroke-dashoffset: 14; }
  to { stroke-dashoffset: 0; }
}

/* 3D splats animation */
.hero-illustration .splat-3d {
  animation: heroSplatBreathe 4s ease-in-out infinite;
}

.hero-illustration .s1 { animation-delay: 0s; }
.hero-illustration .s2 { animation-delay: 0.4s; }
.hero-illustration .s3 { animation-delay: 0.8s; }
.hero-illustration .s4 { animation-delay: 1.2s; }
.hero-illustration .s5 { animation-delay: 1.6s; }
.hero-illustration .s6 { animation-delay: 2s; }
.hero-illustration .s7 { animation-delay: 2.4s; }
.hero-illustration .s8 { animation-delay: 2.8s; }

@keyframes heroSplatBreathe {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.1); opacity: 1; }
}

/* Multi-view cards animation */
.hero-illustration .view {
  animation: heroViewFloat 5s ease-in-out infinite;
}

.hero-illustration .v1 { animation-delay: 0s; }
.hero-illustration .v2 { animation-delay: 0.5s; }
.hero-illustration .v3 { animation-delay: 1s; }
.hero-illustration .v4 { animation-delay: 1.5s; }

@keyframes heroViewFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

/* Flow lines animation */
.hero-illustration .flow-line {
  stroke-dasharray: 10 5;
  animation: heroFlowMove 8s linear infinite;
}

.hero-illustration .fl1 { animation-delay: 0s; }
.hero-illustration .fl2 { animation-delay: 2s; animation-direction: reverse; }
.hero-illustration .fl3 { animation-delay: 4s; }

@keyframes heroFlowMove {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: 100; }
}

/* Prompt text lines animation */
.hero-illustration .text-line {
  animation: heroTextReveal 3s ease-in-out infinite;
}

.hero-illustration .tl1 { animation-delay: 0s; }
.hero-illustration .tl2 { animation-delay: 0.2s; }
.hero-illustration .tl3 { animation-delay: 0.4s; }
.hero-illustration .tl4 { animation-delay: 0.6s; }

@keyframes heroTextReveal {
  0%, 100% { opacity: 0.4; transform: scaleX(1); }
  50% { opacity: 0.7; transform: scaleX(1.02); }
}

/* Cursor blink animation */
.hero-illustration .cursor-blink {
  animation: heroCursorBlink 1s step-end infinite;
}

@keyframes heroCursorBlink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Sketch content subtle animation */
.hero-illustration .sketch-content {
  animation: heroSketchPulse 4s ease-in-out infinite;
}

@keyframes heroSketchPulse {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.02); }
}

/* Generated image - static, no animations */
.hero-illustration .gen-content-static {
  /* Static image - no animations */
}

/* Hidden layer 3 animation */
.hero-illustration .hidden-layer-3 .nn-node {
  animation-delay: 0.75s;
}

/* Flow arrows pulse */
.hero-illustration .flow-arrow {
  animation: heroArrowPulse 2s ease-in-out infinite;
}

@keyframes heroArrowPulse {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

/* Orbit ring rotation */
.hero-illustration .orbit-ring {
  animation: heroOrbitRing 6s linear infinite;
  transform-origin: center;
}

.hero-illustration .orbit-dot {
  animation: heroOrbitDot 6s linear infinite;
  transform-origin: -25px 0;
}

@keyframes heroOrbitRing {
  from { transform: rotateX(60deg) rotateZ(0deg); }
  to { transform: rotateX(60deg) rotateZ(360deg); }
}

@keyframes heroOrbitDot {
  from { transform: rotate(0deg) translateX(25px); }
  to { transform: rotate(360deg) translateX(25px); }
}

/* Reconstruction rays */
.hero-illustration .reconstruction-rays .ray {
  animation: heroReconRay 2s linear infinite;
}

@keyframes heroReconRay {
  from { stroke-dashoffset: 10; }
  to { stroke-dashoffset: 0; }
}

/* Prompt box glow on hover */
.hero-illustration .prompt-box:hover rect,
.hero-illustration .sketch-input:hover rect {
  filter: drop-shadow(0 0 8px rgba(127, 90, 240, 0.4));
}

/* Generated image - static subtle glow */
.hero-illustration .generated-image > rect {
  filter: drop-shadow(0 0 8px rgba(127, 90, 240, 0.25));
}

/* 3D model frame - animated glow */
.hero-illustration .reconstructed-3d > rect {
  animation: hero3dGlowFrame 4s ease-in-out infinite;
}

@keyframes hero3dGlowFrame {
  0%, 100% { filter: drop-shadow(0 0 5px rgba(0, 180, 216, 0.2)); }
  50% { filter: drop-shadow(0 0 15px rgba(0, 180, 216, 0.4)); }
}


/* Bidirectional connector animations */
.hero-illustration .inverse-arrow {
  animation: heroInverseArrowPulse 2s ease-in-out infinite;
}

.hero-illustration .forward-arrow {
  animation: heroForwardArrowPulse 2s ease-in-out infinite 1s;
}

@keyframes heroInverseArrowPulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

@keyframes heroForwardArrowPulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

/* Inverse rays animation */
.hero-illustration .inv-ray {
  animation: heroInvRayDash 1.5s linear infinite;
}

@keyframes heroInvRayDash {
  from { stroke-dashoffset: 6; }
  to { stroke-dashoffset: 0; }
}

/* Wireframe hints animation */
.hero-illustration .wireframe-hints {
  animation: heroWireframePulse 3s ease-in-out infinite;
}

@keyframes heroWireframePulse {
  0%, 100% { opacity: 0.15; }
  50% { opacity: 0.35; }
}

/* 3D rotation indicator */
.hero-illustration .rotation-indicator-3d .orbit-ring {
  animation: hero3dOrbitRing 5s linear infinite;
  transform-origin: center;
}

.hero-illustration .rotation-indicator-3d .orbit-dot {
  animation: hero3dOrbitDot 5s linear infinite;
}

@keyframes hero3dOrbitRing {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.7; }
}

@keyframes hero3dOrbitDot {
  from { transform: rotate(0deg) translateX(30px); }
  to { transform: rotate(360deg) translateX(30px); }
}

/* Responsive hero */
@media (max-width: 768px) {
  .hero-section {
    margin-bottom: 1.5rem;
    border-radius: 12px;
  }

  .hero-illustration {
    min-height: 150px;
    max-height: 220px;
  }

  .hero-title-overlay {
    padding: 1rem;
  }

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

  .hero-subtitle {
    font-size: 0.75rem;
  }

  .hero-labels {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-illustration {
    min-height: 120px;
    max-height: 180px;
  }

  .hero-title {
    font-size: 0.95rem;
  }

  .hero-subtitle {
    font-size: 0.7rem;
  }
}