/* Indicatrix - Official Project Website Stylesheet
 * Free & Open Source Physically-Based Gemstone Path Tracer & Faceting Studio
 * License: MIT | GitHub: https://github.com/suitable-name/indicatrix
 */

:root {
  /* Color Palette - Deep Obsidian & Optical Gemstone Accents */
  --bg-primary: #0a0c10;
  --bg-secondary: #0f131a;
  --bg-tertiary: #161b26;
  --bg-card: rgba(22, 27, 38, 0.75);
  --bg-card-hover: rgba(28, 35, 51, 0.9);
  --bg-glass: rgba(15, 19, 26, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(56, 189, 248, 0.25);
  --border-active: rgba(0, 240, 255, 0.6);

  /* Gemstone Accents (Dispersion Rainbow) */
  --accent-cyan: #00f0ff;
  --accent-blue: #38bdf8;
  --accent-sapphire: #2563eb;
  --accent-emerald: #10b981;
  --accent-ruby: #f43f5e;
  --accent-amethyst: #a855f7;
  --accent-amber: #f59e0b;
  --accent-diamond: #f8fafc;

  /* Text & Readability */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-code: #38bdf8;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spacing & Layout */
  --max-width: 1240px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  /* Shadows & Glows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --glow-cyan: 0 0 25px rgba(0, 240, 255, 0.2);
  --glow-ruby: 0 0 25px rgba(244, 63, 94, 0.2);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(56, 189, 248, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

a:hover {
  color: #7dd3fc;
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.4);
}

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

code, pre {
  font-family: var(--font-mono);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffffff 40%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.5));
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
  padding: 0.25rem 0;
}

.nav-link:hover, .nav-link.active {
  color: #fff;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-amethyst));
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.925rem;
  font-weight: 600;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0ea5e9, #2563eb);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #38bdf8, #3b82f6);
  color: #fff;
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-outline:hover {
  background: rgba(0, 240, 255, 0.1);
  color: #fff;
  box-shadow: var(--glow-cyan);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.825rem;
}

.btn-github {
  background: #1f242e;
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-github:hover {
  background: #2a313f;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}

/* Hero Section */
.hero {
  padding: 5rem 0 4rem 0;
  position: relative;
  text-align: center;
}

.hero-badge-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--accent-blue);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #00f0ff 0%, #38bdf8 30%, #a855f7 70%, #f43f5e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 2.5rem auto;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 880px;
  margin: 0 auto 3.5rem auto;
  padding: 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

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

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  font-family: var(--font-mono);
}

.stat-value.cyan { color: var(--accent-cyan); }
.stat-value.ruby { color: var(--accent-ruby); }
.stat-value.emerald { color: var(--accent-emerald); }
.stat-value.amethyst { color: var(--accent-amethyst); }

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Application Showcase Frame (Hero Asset) */
.hero-media {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
}

.app-window-frame {
  background: #141822;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 40px rgba(56, 189, 248, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.app-window-frame:hover {
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.8), 0 0 50px rgba(56, 189, 248, 0.18);
}

.window-titlebar {
  background: #0f131c;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.window-dots {
  display: flex;
  gap: 6px;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.window-dot.red { background: #ef4444; }
.window-dot.yellow { background: #eab308; }
.window-dot.green { background: #22c55e; }

.window-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.app-screenshot {
  width: 100%;
  display: block;
  object-fit: cover;
}

/* Physics Comparison Cards */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.comparison-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.comparison-card.conventional {
  border-top: 3px solid #ef4444;
}

.comparison-card.indicatrix {
  border-top: 3px solid var(--accent-cyan);
  background: linear-gradient(180deg, rgba(22, 27, 38, 0.9) 0%, rgba(15, 23, 42, 0.7) 100%);
  box-shadow: var(--glow-cyan);
}

.comparison-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.comparison-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
}

.badge-fail {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-pass {
  background: rgba(0, 240, 255, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.comparison-title {
  font-size: 1.35rem;
  font-weight: 700;
}

.comparison-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.comparison-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.comparison-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.comparison-item strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
  font-size: 0.975rem;
}

.comparison-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: var(--shadow-md), 0 0 20px rgba(56, 189, 248, 0.1);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.5rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
}

.feature-icon-box.cyan { color: var(--accent-cyan); background: rgba(0, 240, 255, 0.08); border-color: rgba(0, 240, 255, 0.2); }
.feature-icon-box.ruby { color: var(--accent-ruby); background: rgba(244, 63, 94, 0.08); border-color: rgba(244, 63, 94, 0.2); }
.feature-icon-box.emerald { color: var(--accent-emerald); background: rgba(16, 185, 129, 0.08); border-color: rgba(16, 185, 129, 0.2); }
.feature-icon-box.amethyst { color: var(--accent-amethyst); background: rgba(168, 85, 247, 0.08); border-color: rgba(168, 85, 247, 0.2); }
.feature-icon-box.amber { color: var(--accent-amber); background: rgba(245, 158, 11, 0.08); border-color: rgba(245, 158, 11, 0.2); }
.feature-icon-box.blue { color: var(--accent-blue); background: rgba(56, 189, 248, 0.08); border-color: rgba(56, 189, 248, 0.2); }

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.feature-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
}

.feature-tag-list {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.feature-pill {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
}

/* Interactive Material Explorer Widget */
.material-widget-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  margin-top: 2rem;
}

.material-selector-bar {
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
  scrollbar-width: thin;
}

.material-chip {
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.material-chip:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
}

.material-chip.active {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), rgba(56, 189, 248, 0.2));
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
}

.material-display-grid {
  display: grid;
  grid-template-columns: 1.2fr 1.8fr;
  gap: 2.5rem;
  align-items: center;
}

.material-info-panel h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.material-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.material-meta-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}

.material-meta-table tr {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.material-meta-table td {
  padding: 0.6rem 0;
  font-size: 0.9rem;
}

.material-meta-table td:first-child {
  color: var(--text-muted);
  font-weight: 500;
  width: 45%;
}

.material-meta-table td:last-child {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-weight: 600;
}

.canvas-container {
  background: #0d1017;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  position: relative;
}

.canvas-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.dispersion-canvas {
  width: 100%;
  height: 220px;
  display: block;
}

/* Architecture / Workspace Map Grid */
.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.ecosystem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.ecosystem-card:hover {
  transform: translateY(-3px);
  border-color: rgba(56, 189, 248, 0.35);
}

.crate-type {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  margin-bottom: 0.4rem;
}

.crate-name {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: #fff;
  margin-bottom: 0.65rem;
}

.crate-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Gallery & Media Section */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.gallery-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.gallery-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: var(--shadow-lg);
}

.gallery-img-wrapper {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: #0d111a;
  cursor: pointer;
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.gallery-card:hover .gallery-img {
  transform: scale(1.02);
}

.gallery-info {
  padding: 1.5rem;
}

.gallery-tag {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 0.35rem;
  display: block;
}

.gallery-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.gallery-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* User Image Addition Instruction Box */
.image-guide-box {
  background: rgba(30, 41, 59, 0.5);
  border: 1px dashed rgba(56, 189, 248, 0.4);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin-top: 3rem;
}

.image-guide-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.image-guide-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.image-guide-steps {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.image-guide-steps code {
  background: #0d111a;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--accent-cyan);
}

/* Quickstart / Code Snippet Section */
.code-block-container {
  background: #0d111a;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 1.5rem;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: #131824;
  border-bottom: 1px solid var(--border-subtle);
}

.code-title {
  font-size: 0.825rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.copy-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.code-content {
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.6;
  color: #e2e8f0;
}

.code-content .comment { color: #64748b; }
.code-content .keyword { color: #f43f5e; font-weight: 600; }
.code-content .string { color: #10b981; }
.code-content .func { color: #38bdf8; }

/* Lightbox Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 7, 10, 0.92);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  max-width: 90vw;
  max-height: 90vh;
  position: relative;
}

.modal-img {
  max-width: 100%;
  max-height: 85vh;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-subtle);
}

.modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
}

.modal-caption {
  text-align: center;
  margin-top: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background: #080a0e;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem 0;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #fff;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* Documentation Content Styling (Used on physics, editor, materials, distributed pages) */
.doc-header {
  padding: 3.5rem 0 2.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.4) 0%, transparent 100%);
}

.doc-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3.5rem;
  padding: 3rem 0;
}

.doc-sidebar {
  position: sticky;
  top: 6rem;
  height: fit-content;
  max-height: calc(100vh - 8rem);
  overflow-y: auto;
  padding-right: 1rem;
}

.doc-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.doc-nav-item a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: block;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

.doc-nav-item a:hover, .doc-nav-item a.active {
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.05);
  border-left-color: var(--accent-cyan);
}

.doc-content {
  max-width: 840px;
}

.doc-content h2 {
  font-size: 1.85rem;
  font-weight: 800;
  margin: 2.5rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  color: #fff;
}

.doc-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem 0;
  color: var(--accent-blue);
}

.doc-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.doc-content ul, .doc-content ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: var(--text-secondary);
}

.doc-content li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.9rem;
}

.doc-content th {
  background: #141822;
  color: #fff;
  text-align: left;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-subtle);
  font-weight: 600;
}

.doc-content td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.doc-content tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

.doc-callout {
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 1.75rem 0;
  border-left: 4px solid;
  background: rgba(15, 23, 42, 0.6);
}

.doc-callout.note {
  border-color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.05);
}

.doc-callout.tip {
  border-color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.05);
}

.doc-callout.important {
  border-color: var(--accent-ruby);
  background: rgba(244, 63, 94, 0.05);
}

.doc-callout-title {
  font-weight: 700;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.doc-callout.note .doc-callout-title { color: var(--accent-cyan); }
.doc-callout.tip .doc-callout-title { color: var(--accent-emerald); }
.doc-callout.important .doc-callout-title { color: var(--accent-ruby); }

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.75rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .ecosystem-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .material-display-grid { grid-template-columns: 1fr; }
  .doc-layout { grid-template-columns: 1fr; }
  .doc-sidebar { display: none; }
}

@media (max-width: 768px) {
  .hero-title { font-size: 2.25rem; }
  .hero-subtitle { font-size: 1.05rem; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 4.5rem;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
  }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: block; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .comparison-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
}