/**
 * Lenia Documentation - Stylesheet
 * A professional dark theme matching ImGui aesthetics
 * 
 * Color Palette:
 * - Background: #0d0d0f (deep black)
 * - Surface: #1a1a1e (elevated surfaces)
 * - Surface Light: #242428 (cards, inputs)
 * - Border: #2d2d32 (subtle borders)
 * - Text Primary: #e8e8eb (high contrast)
 * - Text Secondary: #9d9da3 (muted)
 * - Accent: #4296FA (blue highlight)
 * - Accent Hover: #5ba3fb
 */

/* 
   CSS Custom Properties (Design Tokens)
    */
:root {
  /* Colors */
  --color-bg-primary: #0d0d0f;
  --color-bg-secondary: #1a1a1e;
  --color-bg-tertiary: #242428;
  --color-bg-elevated: #2a2a2f;
  --color-border: #2d2d32;
  --color-border-light: #3d3d44;

  --color-text-primary: #e8e8eb;
  --color-text-secondary: #9d9da3;
  --color-text-muted: #6d6d73;

  --color-accent: #4296fa;
  --color-accent-hover: #5ba3fb;
  --color-accent-dim: rgba(66, 150, 250, 0.15);
  --color-accent-glow: rgba(66, 150, 250, 0.4);

  --color-success: #4ade80;
  --color-warning: #fbbf24;
  --color-error: #f87171;

  /* Typography */
  --font-family-base:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;

  --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-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

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

  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;

  /* Borders */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --header-height: 64px;
  --content-max-width: 1200px;
  --sidebar-width: 280px;
}

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

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

/* Custom Scrollbars - Minimal & Elegant */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-light);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

/* Subtle Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

body {
  font-family: var(--font-family-base);
  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);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Selection styling */
::selection {
  background-color: var(--color-accent);
  color: white;
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 
   Typography
    */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}
h5 {
  font-size: var(--font-size-lg);
}
h6 {
  font-size: var(--font-size-base);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-4);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

strong {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

code {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  background-color: var(--color-bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--color-accent);
}

kbd {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  background: linear-gradient(
    180deg,
    var(--color-bg-elevated) 0%,
    var(--color-bg-tertiary) 100%
  );
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 0.2em 0.5em;
  box-shadow: 0 2px 0 var(--color-border);
  color: var(--color-text-primary);
}

/* 
   Header & Navigation
    */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(13, 13, 15, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.header-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--color-accent);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%,
  100% {
    text-shadow: 0 0 8px var(--color-accent-glow);
    opacity: 1;
  }
  50% {
    text-shadow: 0 0 16px var(--color-accent-glow);
    opacity: 0.85;
  }
}

.version-badge {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  background-color: var(--color-accent-dim);
  color: var(--color-accent);
  padding: 0.2em 0.6em;
  border-radius: var(--radius-full);
  margin-left: var(--spacing-2);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-1);
}

.nav-link {
  display: block;
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-tertiary);
}

.nav-link.active {
  color: var(--color-accent);
  background-color: var(--color-accent-dim);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-2);
  cursor: pointer;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  position: relative;
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-fast);
}

.hamburger::before {
  top: -7px;
}
.hamburger::after {
  bottom: -7px;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: var(--spacing-3);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  padding: 2px;
  border: 1px solid var(--color-border);
}

.lang-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-family-base);
  letter-spacing: 0.03em;
}

.lang-btn:hover {
  color: var(--color-text-primary);
}

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

/* GitHub link */
.github-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.github-link:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-tertiary);
}

/* 
   Main Content Area
    */
.main-content {
  flex: 1;
  margin-top: var(--header-height);
}

.tab-content {
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition:
    opacity var(--transition-normal),
    transform var(--transition-normal);
}

.tab-content.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
  animation: fadeIn 0.4s ease-out;
}

.content-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--spacing-12) var(--spacing-6);
}

.page-title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-8);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-6);
  text-align: center;
}

.subsection-title {
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
  margin-top: var(--spacing-10);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.subsection-title:first-of-type {
  margin-top: 0;
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-accent-dim);
  border-radius: var(--radius-md);
  color: var(--color-accent);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

/* 
   Home / Hero Section
    */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-12);
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--spacing-12) var(--spacing-6);
  min-height: calc(100vh - var(--header-height) - 200px);
  align-items: center;
}

/* Simulation Viewport */
.simulation-viewport {
  display: flex;
  justify-content: center;
}

.viewport-frame {
  width: 100%;
  max-width: 500px;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.viewport-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-4);
  background-color: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
}

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

.viewport-controls {
  display: flex;
  gap: var(--spacing-2);
}

.control-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.control-dot.red {
  background-color: #ff5f56;
}
.control-dot.yellow {
  background-color: #ffbd2e;
}
.control-dot.green {
  background-color: #27ca40;
}

.viewport-canvas {
  position: relative;
  aspect-ratio: 1;
  background: linear-gradient(135deg, #0a0a0c 0%, #151518 50%, #0a0a0c 100%);
}

#lenia-placeholder {
  width: 100%;
  height: 100%;
  display: block;
}

.viewport-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(
    circle at center,
    transparent 0%,
    rgba(0, 0, 0, 0.5) 100%
  );
}

.lenia-logo-large {
  font-size: 5rem;
  color: var(--color-accent);
  text-shadow: 0 0 40px var(--color-accent-glow);
  animation: logo-pulse 4s ease-in-out infinite;
}

@keyframes logo-pulse {
  0%,
  100% {
    transform: scale(1);
    text-shadow: 0 0 40px var(--color-accent-glow);
  }
  50% {
    transform: scale(1.05);
    text-shadow:
      0 0 60px var(--color-accent-glow),
      0 0 80px var(--color-accent-dim);
  }
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-top: var(--spacing-4);
  letter-spacing: 0.05em;
}

.hero-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-top: var(--spacing-2);
}

.viewport-stats {
  position: absolute;
  bottom: var(--spacing-3);
  left: var(--spacing-3);
  right: var(--spacing-3);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.stat {
  background-color: rgba(0, 0, 0, 0.5);
  padding: 0.25em 0.5em;
  border-radius: var(--radius-sm);
}

/* Hero Content */
.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.tagline-box {
  max-width: 500px;
}

.tagline {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-4);
}

.hero-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-6);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-6);
}

.badge {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 0.35em 0.75em;
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-3);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-accent);
  color: white;
}

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

.btn-secondary {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-bg-elevated);
  border-color: var(--color-border-light);
  color: var(--color-text-primary);
}

/* Features Preview Grid */
.features-preview {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--spacing-12) var(--spacing-6);
  border-top: 1px solid var(--color-border);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-6);
}

.preview-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.6s ease-out backwards;
}

.preview-card:nth-child(1) {
  animation-delay: 0.1s;
}
.preview-card:nth-child(2) {
  animation-delay: 0.2s;
}
.preview-card:nth-child(3) {
  animation-delay: 0.3s;
}
.preview-card:nth-child(4) {
  animation-delay: 0.4s;
}

.preview-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.preview-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(66, 150, 250, 0.15);
}

.preview-card:hover::before {
  opacity: 1;
}

.card-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: linear-gradient(
    135deg,
    var(--color-accent-dim) 0%,
    rgba(66, 150, 250, 0.05) 100%
  );
  border: 1px solid rgba(66, 150, 250, 0.2);
  border-radius: var(--radius-lg);
  color: var(--color-accent);
  margin-bottom: var(--spacing-5);
  transition: all var(--transition-normal);
}

.preview-card:hover .card-icon-wrapper {
  background: linear-gradient(135deg, var(--color-accent) 0%, #3a7bd5 100%);
  border-color: transparent;
  color: white;
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(66, 150, 250, 0.3);
}

.card-icon-wrapper svg {
  width: 28px;
  height: 28px;
  transition: transform var(--transition-normal);
}

.preview-card:hover .card-icon-wrapper svg {
  transform: scale(1.1);
}

.preview-card h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-3);
  color: var(--color-text-primary);
}

.preview-card p {
  font-size: var(--font-size-sm);
  margin-bottom: 0;
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

/* Architecture / Rendering Pipeline */
.architecture-overview {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--spacing-10) var(--spacing-6);
  border-top: 1px solid var(--color-border);
}

.architecture-overview .section-title {
  margin-bottom: var(--spacing-8);
}

.pipeline-visual {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-4);
  position: relative;
}

.pipeline-visual::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-accent-dim) 10%,
    var(--color-accent) 50%,
    var(--color-accent-dim) 90%,
    transparent 100%
  );
  z-index: 0;
  transform: translateY(-50%);
}

.pipeline-stage {
  position: relative;
  z-index: 1;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
}

.pipeline-stage:nth-child(1) {
  animation-delay: 0.1s;
}
.pipeline-stage:nth-child(3) {
  animation-delay: 0.2s;
}
.pipeline-stage:nth-child(5) {
  animation-delay: 0.3s;
}
.pipeline-stage:nth-child(7) {
  animation-delay: 0.4s;
}

.pipeline-stage:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(66, 150, 250, 0.15);
}

.stage-header {
  background: linear-gradient(
    135deg,
    var(--color-accent-dim) 0%,
    var(--color-bg-tertiary) 100%
  );
  padding: var(--spacing-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.stage-header::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent-glow);
}

.stage-body {
  padding: var(--spacing-4);
}

.stage-body p {
  font-size: var(--font-size-xs);
  margin-bottom: var(--spacing-3);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  font-size: var(--font-size-xs);
  font-family: var(--font-family-mono);
  color: var(--color-text-muted);
  background-color: var(--color-bg-tertiary);
  padding: 0.3em 0.6em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.source-link:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-dim);
  border-color: var(--color-accent);
}

.source-link::before {
  content: "< >";
  font-size: 0.7em;
  opacity: 0.7;
}

.pipeline-connector {
  display: none;
}

/* 
   Theory Section
    */
.theory-intro {
  margin-bottom: var(--spacing-8);
}

.intro-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
}

.theory-section {
  margin-bottom: var(--spacing-10);
}

.theory-section > p {
  text-align: justify;
  text-justify: inter-word;
}

/* Concept Grid */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-6);
}

.concept-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
}

.concept-card:nth-child(1) {
  animation-delay: 0.1s;
}
.concept-card:nth-child(2) {
  animation-delay: 0.2s;
}
.concept-card:nth-child(3) {
  animation-delay: 0.3s;
}

.concept-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(66, 150, 250, 0.1);
}

.concept-card h4 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-3);
}

.concept-card p {
  font-size: var(--font-size-sm);
}

/* Formula boxes */
.formula-box {
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--spacing-5);
  margin-top: var(--spacing-4);
  border: 1px solid var(--color-border);
}

.formula-box.compact {
  padding: var(--spacing-4);
  margin-top: var(--spacing-3);
}

.formula-box.large {
  padding: var(--spacing-8);
  text-align: center;
  background: linear-gradient(
    135deg,
    var(--color-bg-tertiary) 0%,
    var(--color-bg-secondary) 100%
  );
}

.formula-label {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.math-block {
  display: block;
  text-align: center;
  font-size: 1.2rem;
  overflow-x: auto;
  padding: var(--spacing-2) 0;
}

.formula-box.large .math-block {
  font-size: 1.4rem;
}

.formula-box.compact .math-block {
  font-size: 1.1rem;
}

.math-inline {
  font-family: var(--font-family-mono);
  color: var(--color-text-primary);
}

.math-cell {
  font-family: var(--font-family-mono);
  color: var(--color-accent);
}

.formula-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--spacing-4);
}

/* Pipeline diagram */
.pipeline-diagram {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

.pipeline-step {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  position: relative;
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
}

.pipeline-step:nth-child(1) {
  animation-delay: 0.1s;
}
.pipeline-step:nth-child(3) {
  animation-delay: 0.15s;
}
.pipeline-step:nth-child(5) {
  animation-delay: 0.2s;
}
.pipeline-step:nth-child(7) {
  animation-delay: 0.25s;
}

.pipeline-step:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(66, 150, 250, 0.1);
}

.pipeline-arrow {
  display: none;
}

.step-number {
  position: absolute;
  top: var(--spacing-4);
  right: var(--spacing-4);
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #3a7bd5 100%);
  color: white;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(66, 150, 250, 0.3);
}

.step-content h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
  padding-right: var(--spacing-10);
}

.step-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-3);
}

.step-content .formula-box {
  margin-top: var(--spacing-3);
}

.step-content .formula-box.compact {
  padding: var(--spacing-3);
  background-color: var(--color-bg-tertiary);
}

.step-content .math-block {
  font-size: 0.95rem;
  white-space: nowrap;
  overflow-x: auto;
  padding: var(--spacing-1) 0;
}

/* Parameters table */
.params-table-container {
  overflow-x: auto;
  margin-top: var(--spacing-4);
}

.params-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.params-table th,
.params-table td {
  padding: var(--spacing-3) var(--spacing-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.params-table th {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
}

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

.params-table tbody tr:hover {
  background-color: var(--color-bg-secondary);
}

/* Growth functions grid */
.growth-functions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

.growth-func {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
}

.growth-func:nth-child(1) {
  animation-delay: 0.05s;
}
.growth-func:nth-child(2) {
  animation-delay: 0.1s;
}
.growth-func:nth-child(3) {
  animation-delay: 0.15s;
}
.growth-func:nth-child(4) {
  animation-delay: 0.2s;
}
.growth-func:nth-child(5) {
  animation-delay: 0.25s;
}
.growth-func:nth-child(6) {
  animation-delay: 0.3s;
}
.growth-func:nth-child(7) {
  animation-delay: 0.35s;
}
.growth-func:nth-child(8) {
  animation-delay: 0.4s;
}

.growth-func:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(66, 150, 250, 0.1);
}

.func-name {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-3);
}

.func-formula {
  font-size: 1rem;
  color: var(--color-text-primary);
  margin-top: auto;
  padding: var(--spacing-3);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  text-align: center;
  overflow-x: auto;
}

/* Kernel types grid */
.kernel-types-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-4);
}

.kernel-type {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
}

.kernel-type:nth-child(1) {
  animation-delay: 0.1s;
}
.kernel-type:nth-child(2) {
  animation-delay: 0.15s;
}
.kernel-type:nth-child(3) {
  animation-delay: 0.2s;
}
.kernel-type:nth-child(4) {
  animation-delay: 0.25s;
}

.kernel-type:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(66, 150, 250, 0.1);
}

.kernel-type h5 {
  font-size: var(--font-size-base);
  color: var(--color-accent);
  margin-bottom: var(--spacing-2);
}

.kernel-type p {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-3);
}

.kernel-type .formula-box {
  margin-top: 0;
}

/* Multichannel explanation */
.multichannel-explanation {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-5);
  margin-top: var(--spacing-6);
}

.multichannel-explanation h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-3);
}

.multichannel-explanation > p {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-4);
}

.interaction-examples {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-3);
}

.interaction-example {
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.interaction-example strong {
  display: block;
  color: var(--color-accent);
  margin-bottom: var(--spacing-1);
}

/* Simulation Variants Detailed Grid */
.variants-detailed-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

.variant-detailed {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
}

.variant-detailed:nth-child(1) {
  animation-delay: 0.05s;
}
.variant-detailed:nth-child(2) {
  animation-delay: 0.1s;
}
.variant-detailed:nth-child(3) {
  animation-delay: 0.15s;
}
.variant-detailed:nth-child(4) {
  animation-delay: 0.2s;
}
.variant-detailed:nth-child(5) {
  animation-delay: 0.25s;
}
.variant-detailed:nth-child(6) {
  animation-delay: 0.3s;
}

.variant-detailed:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.variant-detailed h4 {
  font-size: var(--font-size-base);
  color: var(--color-accent);
  margin-bottom: var(--spacing-2);
}

.variant-detailed p {
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-3);
}

.variant-params {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.param-tag {
  font-size: var(--font-size-xs);
  padding: 0.2em 0.6em;
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}

/* Pattern Taxonomy Grid */
.taxonomy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

.taxon-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.taxon-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.taxon-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(66, 150, 250, 0.12);
}

.taxon-card:hover::before {
  opacity: 1;
}

.taxon-image {
  width: 100%;
  height: 100px;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-3);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

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

.taxon-image-placeholder {
  font-size: 2rem;
  color: var(--color-accent);
  opacity: 0.4;
  transition: all var(--transition-normal);
}

.taxon-card:hover .taxon-image-placeholder {
  opacity: 0.7;
  transform: scale(1.1);
}

.taxon-card h5 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-2);
  font-style: italic;
}

.taxon-card p {
  font-size: var(--font-size-xs);
  margin-bottom: 0;
}

/* Boundary Conditions List */
.boundary-list {
  list-style: none;
  margin-top: var(--spacing-4);
}

.boundary-list li {
  padding: var(--spacing-4);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-3);
  font-size: var(--font-size-sm);
  transition: all var(--transition-normal);
}

.boundary-list li:hover {
  border-color: var(--color-accent);
}

.boundary-list li strong {
  color: var(--color-accent);
}

/* Reference box */
.reference-box {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--spacing-5);
  margin-top: var(--spacing-8);
}

.reference-box h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-3);
}

.reference-list {
  list-style: none;
}

.reference-list li {
  margin-bottom: var(--spacing-2);
}

.reference-list a {
  font-size: var(--font-size-sm);
}

/* 
   Features Section
    */
.features-section {
  margin-bottom: var(--spacing-10);
  padding-bottom: var(--spacing-10);
  border-bottom: 1px solid var(--color-border);
}

.features-section:last-child {
  border-bottom: none;
}

.feature-content {
  padding-left: var(--spacing-6);
}

.feature-content h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-top: var(--spacing-6);
  margin-bottom: var(--spacing-3);
}

.feature-content h4:first-child {
  margin-top: 0;
}

.feature-highlights {
  display: flex;
  gap: var(--spacing-6);
  margin: var(--spacing-6) 0;
}

.highlight {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4) var(--spacing-6);
}

.highlight-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
}

.highlight-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.architecture-diagram {
  margin-top: var(--spacing-6);
}

.pipeline-code {
  display: block;
  background-color: var(--color-bg-tertiary);
  padding: var(--spacing-4);
  border-radius: var(--radius-md);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  overflow-x: auto;
  white-space: nowrap;
}

/* Variants grid */
.variants-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-4);
}

.variant-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  transition: border-color var(--transition-fast);
}

.variant-card:hover {
  border-color: var(--color-accent-dim);
}

.variant-card h4 {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  margin-bottom: var(--spacing-2);
}

.variant-card p {
  font-size: var(--font-size-xs);
  margin-bottom: 0;
}

/* Colormap list */
.colormap-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin: var(--spacing-4) 0;
}

.colormap {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 0.4em 0.8em;
  border-radius: var(--radius-full);
  color: white;
  min-width: 85px;
  text-align: center;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.colormap.viridis {
  background: linear-gradient(90deg, #440154, #21918c, #fde725);
}
.colormap.magma {
  background: linear-gradient(90deg, #000004, #b73779, #fcfdbf);
}
.colormap.inferno {
  background: linear-gradient(90deg, #000004, #bb3754, #fcffa4);
}
.colormap.plasma {
  background: linear-gradient(90deg, #0d0887, #cc4778, #f0f921);
}
.colormap.jet {
  background: linear-gradient(90deg, #00007f, #00ffff, #ffff00, #ff0000);
}
.colormap.lenia {
  background: linear-gradient(90deg, #000000, #4296fa, #ffffff);
}
.colormap.rainbow {
  background: linear-gradient(
    90deg,
    #ff0000,
    #ffff00,
    #00ff00,
    #00ffff,
    #0000ff,
    #ff00ff
  );
}
.colormap.grayscale {
  background: linear-gradient(90deg, #000000, #ffffff);
  color: #666;
}
.colormap.cabry {
  background: linear-gradient(
    90deg,
    #000000 0%,
    #030008 15%,
    #2a105a 35%,
    #6040a0 55%,
    #a080b0 75%,
    #cce5e5 100%
  );
}
.colormap.doly {
  background: linear-gradient(
    90deg,
    #000000 0%,
    #141216 15%,
    #3a2860 35%,
    #6050a0 55%,
    #9080a0 75%,
    #bbc7c7 100%
  );
}
.colormap.dolydark {
  background: linear-gradient(
    90deg,
    #000000 0%,
    #100d15 15%,
    #302560 35%,
    #5a4890 55%,
    #8070a0 75%,
    #a8b0b0 100%
  );
}
.colormap.dolymiddle {
  background: linear-gradient(
    90deg,
    #000000 0%,
    #120e18 15%,
    #382870 35%,
    #6850a0 55%,
    #9080b0 75%,
    #b5c0b5 100%
  );
}
.colormap.gaga {
  background: linear-gradient(
    90deg,
    #000000 0%,
    #200c00 15%,
    #804020 35%,
    #c06080 55%,
    #ffc0ff 75%,
    #fcfcfc 100%
  );
}

/* Feature list */
.feature-list {
  list-style: none;
  margin: var(--spacing-3) 0;
}

.feature-list li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding: var(--spacing-2) 0;
  padding-left: var(--spacing-4);
  position: relative;
}

.feature-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* UI features grid */
.ui-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-4);
}

.ui-feature {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
}

.ui-feature h5 {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.ui-feature p {
  font-size: var(--font-size-xs);
  margin-bottom: 0;
}

/* Analysis features */
.analysis-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-4);
}

.analysis-item {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
}

.analysis-item h5 {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  margin-bottom: var(--spacing-3);
}

.analysis-item ul {
  list-style: none;
}

.analysis-item li {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  padding: var(--spacing-1) 0;
}

/* Accessibility grid */
.accessibility-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-3);
}

.access-feature {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding: var(--spacing-3);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
}

.access-feature strong {
  color: var(--color-text-primary);
}

/* 
   Installation Section
    */
.requirements-section {
  margin-bottom: var(--spacing-10);
}

.requirements-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-6);
}

.requirement-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
}

.requirement-card h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
}

.requirement-card ul {
  list-style: none;
}

.requirement-card li {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding: var(--spacing-2) 0;
}

/* Build sections */
.install-section,
.usage-section,
.controls-section,
.getting-started-section,
.grid-sizes-section {
  margin-bottom: var(--spacing-10);
}

.build-method {
  margin-bottom: var(--spacing-6);
}

.build-method h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-3);
}

.build-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--spacing-3);
}

/* Code blocks */
.code-block {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-2) var(--spacing-4);
  background-color: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
}

.code-lang {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.copy-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--spacing-1);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-elevated);
}

.code-block pre {
  margin: 0;
  padding: var(--spacing-4);
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background: none;
  padding: 0;
}

/* Controls table */
.controls-table-container {
  overflow-x: auto;
}

.controls-table {
  width: 100%;
  border-collapse: collapse;
}

.controls-table th,
.controls-table td {
  padding: var(--spacing-3) var(--spacing-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.controls-table th {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
}

.controls-table td {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.controls-table tbody tr:hover {
  background-color: var(--color-bg-secondary);
}

/* Steps list */
.steps-list {
  list-style: none;
}

.steps-list li {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  padding: var(--spacing-4);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-3);
}

.steps-list .step-number {
  position: static;
  flex-shrink: 0;
}

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

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

/* Grid info */
.grid-info {
  display: flex;
  gap: var(--spacing-6);
}

.grid-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4) var(--spacing-6);
  flex: 1;
}

.grid-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.grid-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-top: var(--spacing-1);
}

.grid-note {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-1);
}

/* 
   About Section
    */
.about-section {
  margin-bottom: var(--spacing-10);
}

/* Credit card */
.credit-card {
  display: flex;
  gap: var(--spacing-5);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
}

.credit-card.primary {
  border-left: 3px solid var(--color-accent);
}

.credit-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background-color: var(--color-accent-dim);
  border-radius: var(--radius-lg);
  color: var(--color-accent);
  flex-shrink: 0;
}

.credit-icon svg {
  width: 32px;
  height: 32px;
}

.credit-content h4 {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.credit-content p {
  font-size: var(--font-size-sm);
}

.credit-link {
  font-size: var(--font-size-sm);
}

.inspiration-content > p {
  text-align: justify;
  text-justify: inter-word;
}

.inspiration-quote {
  margin-top: var(--spacing-6);
  padding-left: var(--spacing-6);
  border-left: 3px solid var(--color-accent);
}

.inspiration-quote blockquote {
  font-size: var(--font-size-lg);
  font-style: italic;
  color: var(--color-text-secondary);
}

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

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-8);
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--spacing-8) + 2px);
  top: 0;
  width: 12px;
  height: 12px;
  background-color: var(--color-bg-tertiary);
  border: 2px solid var(--color-border);
  border-radius: 50%;
}

.timeline-item.current .timeline-marker {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent-glow);
}

.timeline-date {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-2);
}

.timeline-content {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
}

.timeline-content h4 {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.timeline-content p {
  font-size: var(--font-size-sm);
}

.timeline-link {
  display: inline-block;
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-2);
}

/* Author card */
.author-card {
  display: flex;
  gap: var(--spacing-6);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
}

.author-avatar {
  flex-shrink: 0;
}

.avatar-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background: linear-gradient(
    135deg,
    var(--color-accent) 0%,
    var(--color-accent-hover) 100%
  );
  border-radius: 50%;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: white;
}

.author-info h4 {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: 0;
}

.author-handle {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  margin-bottom: var(--spacing-3) !important;
}

.author-bio {
  font-size: var(--font-size-sm);
}

.author-links {
  display: flex;
  gap: var(--spacing-4);
  margin-top: var(--spacing-4);
}

.author-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

/* Libraries grid */
.libraries-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-4);
}

.library-card {
  display: block;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
  text-align: center;
  transition: all var(--transition-fast);
}

.library-card:hover {
  border-color: var(--color-accent-dim);
  transform: translateY(-2px);
}

.library-card h5 {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-1);
}

.library-card p {
  font-size: var(--font-size-xs);
  margin-bottom: 0;
}

/* License box */
.license-box {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
}

.license-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-top: var(--spacing-4);
}

.license-link {
  display: inline-block;
  margin-top: var(--spacing-4);
  font-size: var(--font-size-sm);
}

/* 
   Footer
    */
.main-footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-6) 0;
  margin-top: auto;
}

.footer-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.footer-logo {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.footer-version {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.footer-center p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.footer-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.footer-right a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

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

.footer-sep {
  color: var(--color-border);
}

/* 
   Responsive Styles
    */

/* Tablet and below */
@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
    text-align: center;
  }

  .hero-content {
    order: -1;
  }

  .tagline-box {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

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

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

  .pipeline-visual::before {
    display: none;
  }

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

  .pipeline-diagram {
    grid-template-columns: 1fr;
  }

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

  .kernel-types-grid {
    grid-template-columns: 1fr;
  }

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

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

  .interaction-examples {
    grid-template-columns: 1fr;
  }

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

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

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .header-container {
    padding: 0 var(--spacing-4);
  }

  .logo-text {
    display: none;
  }

  .version-badge {
    display: none;
  }

  .mobile-menu-toggle {
    display: block;
    order: 2;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-4);
    z-index: 999;
  }

  .nav-list.open {
    display: flex;
  }

  .nav-link {
    padding: var(--spacing-3) var(--spacing-4);
  }

  .github-link {
    order: 1;
  }

  .content-container {
    padding: var(--spacing-8) var(--spacing-4);
  }

  .page-title {
    font-size: var(--font-size-2xl);
  }

  .subsection-title {
    font-size: var(--font-size-lg);
    flex-wrap: wrap;
  }

  .hero-section {
    padding: var(--spacing-8) var(--spacing-4);
    min-height: auto;
  }

  .viewport-frame {
    max-width: 100%;
  }

  .viewport-stats {
    flex-wrap: wrap;
    gap: var(--spacing-2);
    justify-content: center;
  }

  .tagline {
    font-size: var(--font-size-xl);
  }

  .hero-badges {
    justify-content: center;
  }

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

  .preview-card {
    padding: var(--spacing-4);
  }

  .features-preview {
    padding: var(--spacing-8) var(--spacing-4);
  }

  .architecture-overview {
    padding: var(--spacing-8) var(--spacing-4);
  }

  .feature-content {
    padding-left: 0;
  }

  .feature-highlights {
    flex-direction: column;
  }

  .feature-showcase {
    grid-template-columns: 1fr;
  }

  .feature-stat-row {
    flex-direction: column;
    gap: var(--spacing-3);
    align-items: center;
  }

  .growth-functions-grid {
    grid-template-columns: 1fr;
  }

  .kernel-types-grid {
    grid-template-columns: 1fr;
  }

  .interaction-examples {
    grid-template-columns: 1fr;
  }

  .ui-features-grid {
    grid-template-columns: 1fr;
  }

  .analysis-features {
    grid-template-columns: 1fr;
  }

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

  .variants-detailed-grid {
    grid-template-columns: 1fr;
  }

  .variant-detailed.expanded {
    grid-column: span 1;
  }

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

  .pipeline-visual {
    grid-template-columns: 1fr;
  }

  .pipeline-diagram {
    grid-template-columns: 1fr;
  }

  .grid-info {
    flex-direction: column;
  }

  .author-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .author-links {
    justify-content: center;
  }

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

  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  .credit-card {
    flex-direction: column;
  }

  .timeline {
    padding-left: var(--spacing-6);
  }

  .timeline-marker {
    left: calc(-1 * var(--spacing-6) + 2px);
  }

  .controls-table {
    font-size: var(--font-size-xs);
  }

  .controls-table th,
  .controls-table td {
    padding: var(--spacing-2) var(--spacing-3);
  }

  .params-table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .params-table {
    min-width: 500px;
  }

  .history-era-header {
    flex-wrap: wrap;
    gap: var(--spacing-2);
  }

  .history-era-year {
    font-size: var(--font-size-xs);
  }

  .history-era-title {
    font-size: var(--font-size-sm);
  }

  .history-era-person {
    width: 100%;
    font-size: var(--font-size-xs);
  }

  .formula-box {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .math-block {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 1rem;
  }

  .formula-box.large {
    padding: var(--spacing-4);
  }

  .formula-box.large .math-block {
    font-size: 1.1rem;
  }

  .func-formula {
    font-size: 0.85rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .colormap-showcase {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

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

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

  .discovery-methods-grid {
    grid-template-columns: 1fr;
  }

  .ml-methods-grid {
    grid-template-columns: 1fr;
  }

  .discovery-section {
    padding: var(--spacing-4);
  }

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

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

  .steps-list li {
    flex-wrap: wrap;
  }

  .intro-text {
    font-size: var(--font-size-base);
  }

  .back-to-top {
    right: var(--spacing-4);
    width: 40px;
    height: 40px;
  }

  .back-to-top svg {
    width: 18px;
    height: 18px;
  }
}

/* 
   Interactive Elements & Tooltips
    */

/* Tooltip System */
.tooltip-trigger {
  position: relative;
  cursor: help;
  border-bottom: 1px dashed var(--color-accent);
}

.tooltip-content {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  white-space: nowrap;
  max-width: 280px;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.tooltip-content::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--color-border);
}

.tooltip-trigger:hover .tooltip-content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-4px);
}

/* Interactive variant cards with expand */
.variant-detailed {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  transition: all var(--transition-normal);
  animation: fadeInUp 0.5s ease-out backwards;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.variant-detailed::after {
  content: "Click to learn more";
  position: absolute;
  bottom: var(--spacing-3);
  right: var(--spacing-4);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.variant-detailed:hover::after {
  opacity: 0.7;
}

.variant-detailed.expanded {
  grid-column: span 3;
}

.variant-detailed.expanded .variant-extra-info {
  display: block;
}

.variant-extra-info {
  display: none;
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
}

/* Enhanced History Section */
.history-timeline-enhanced {
  position: relative;
  margin-top: var(--spacing-6);
}

.history-era {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  margin-bottom: var(--spacing-4);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.history-era::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.history-era:hover {
  border-color: var(--color-accent);
  transform: translateX(4px);
}

.history-era:hover::before {
  opacity: 1;
}

.history-era-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-3);
}

.history-era-year {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  background-color: var(--color-accent-dim);
  padding: 0.2em 0.6em;
  border-radius: var(--radius-sm);
}

.history-era-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.history-era-person {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

.history-era-content {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: justify;
}

.history-era-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  margin-top: var(--spacing-3);
  font-size: var(--font-size-xs);
  color: var(--color-accent);
}

.history-era-link:hover {
  text-decoration: underline;
}

/* Species Discovery Section */
.discovery-section {
  background: linear-gradient(
    135deg,
    var(--color-bg-secondary) 0%,
    var(--color-bg-tertiary) 100%
  );
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  margin-top: var(--spacing-6);
}

.discovery-methods-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-5);
}

.discovery-method {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
  text-align: center;
  transition: all var(--transition-normal);
}

.discovery-method:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.discovery-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-3);
  background-color: var(--color-accent-dim);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1.5rem;
  transition: all var(--transition-normal);
}

.discovery-method:hover .discovery-icon {
  color: white;
  transform: scale(1.1);
}

.discovery-method h5 {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.discovery-method p {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Enhanced Features Section Cards */
.feature-showcase {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-6);
  margin-top: var(--spacing-6);
}

.feature-showcase-card {
  background: linear-gradient(
    135deg,
    var(--color-bg-secondary) 0%,
    var(--color-bg-tertiary) 100%
  );
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-showcase-card::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle,
    var(--color-accent-dim) 0%,
    transparent 70%
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-showcase-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(66, 150, 250, 0.15);
}

.feature-showcase-card:hover::before {
  opacity: 1;
}

.feature-stat-row {
  display: flex;
  justify-content: space-around;
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
}

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

.feature-stat-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  display: block;
}

.feature-stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Colormap Preview Enhancement */
.colormap-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--spacing-3);
  margin: var(--spacing-5) 0;
}

.colormap-preview {
  height: 24px;
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.colormap-preview:hover {
  transform: scaleY(1.5);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.colormap-preview-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.colormap-preview:hover .colormap-preview-label {
  opacity: 1;
}

/* Concept Details (expanded card content) */
.concept-details {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px dashed var(--color-border);
}

.concept-details p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-3);
}

.concept-details p:last-child {
  margin-bottom: 0;
}

.concept-details strong {
  color: var(--color-accent);
}

/* Theory Deep Dive Sections */
.theory-deep-dive {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--spacing-5);
  margin: var(--spacing-5) 0;
}

.theory-deep-dive h4 {
  color: var(--color-accent);
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-3);
}

.theory-deep-dive p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-3);
}

.theory-deep-dive p:last-child {
  margin-bottom: 0;
}

.theory-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-3) 0;
}

.theory-list li {
  position: relative;
  padding-left: var(--spacing-6);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.theory-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.theory-list li strong {
  color: var(--color-text-primary);
}

/* Growth Functions Detailed Cards */
.growth-functions-detailed {
  margin-top: var(--spacing-6);
}

.growth-functions-detailed h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
}

.growth-func-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-4);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.growth-func-card:hover {
  border-color: var(--color-accent);
}

.growth-func-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-4);
  background-color: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
  gap: var(--spacing-3);
}

.growth-func-header .func-name {
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
}

.growth-func-header .func-formula {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

.growth-func-details {
  padding: var(--spacing-4);
}

.growth-func-details p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-3);
}

.growth-func-details p:last-child {
  margin-bottom: 0;
}

.growth-use-case {
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-3);
  margin-top: var(--spacing-3);
}

.growth-use-case strong {
  color: var(--color-accent);
}

/* ML Methods Grid for Discovery Section */
.discovery-advanced {
  margin-top: var(--spacing-6);
}

.discovery-advanced h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-lg);
}

.ml-methods-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-4);
}

.ml-method {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-5);
  transition: all var(--transition-normal);
}

.ml-method:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.ml-method-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-3);
}

.ml-method-header svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

.ml-method-header h6 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.ml-method p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* Discovery Methods Grid SVG icons */
.discovery-methods-grid .discovery-method svg {
  flex-shrink: 0;
  color: var(--color-accent);
}

/* Skip to content link */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
  padding: var(--spacing-3) var(--spacing-5);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-to-content:focus {
  top: var(--spacing-4);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  width: 44px;
  height: 44px;
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-3px);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* Grid Sizes Section in Features */
.grid-sizes-feature {
  margin-top: var(--spacing-6);
}

.grid-sizes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-4);
  margin-top: var(--spacing-4);
}

.grid-size-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-4);
  text-align: center;
  transition: all var(--transition-normal);
}

.grid-size-card:hover {
  border-color: var(--color-accent);
}

.grid-size-card.default {
  border-color: var(--color-accent);
  background-color: rgba(66, 150, 250, 0.1);
}

.grid-size-card .grid-size-value {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-1);
  font-family: var(--font-family-mono);
}

.grid-size-card .grid-size-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.grid-size-card .grid-size-desc {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-2);
}

.grid-info-note {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-top: var(--spacing-4);
  padding: var(--spacing-3);
  background-color: rgba(66, 150, 250, 0.1);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.grid-info-note svg {
  flex-shrink: 0;
  color: var(--color-accent);
}

/* Keyboard Controls in Features */
.keyboard-controls-feature {
  margin-top: var(--spacing-6);
}

.keyboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-3);
  margin-top: var(--spacing-4);
}

.key-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-3);
  transition: all var(--transition-fast);
}

.key-item:hover {
  border-color: var(--color-accent);
}

.key-combo {
  display: flex;
  gap: var(--spacing-1);
  flex-shrink: 0;
}

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

/* Small mobile */
@media (max-width: 480px) {
  .lenia-logo-large {
    font-size: 3.5rem;
  }

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-actions {
    flex-direction: column;
  }

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

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

  .colormap-showcase {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }

  .grid-size-card .grid-size-value {
    font-size: var(--font-size-base);
  }

  .feature-stat-value {
    font-size: var(--font-size-xl);
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --color-text-primary: #ffffff;
    --color-text-secondary: #e0e0e0;
    --color-border: #555555;
    --color-accent: #6cb3ff;
  }
}

/* Print styles */
@media print {
  .main-header,
  .main-footer,
  .hero-actions,
  .copy-btn {
    display: none !important;
  }

  .main-content {
    margin-top: 0;
  }

  .tab-content {
    display: block !important;
    opacity: 1 !important;
    page-break-after: always;
  }

  body {
    background: white;
    color: black;
  }
}