/* ============================================================
   Wiki — Computing × Art
   Aesthetic matched to angelina007.com (Space Mono, dark/light)
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Dark mode (default) */
  --bg: #0f0f14;
  --bg-secondary: #1a1b27;
  --bg-tertiary: #22243a;
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --text-dim: #71717a;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --sky: #38bdf8;
  --border: rgba(228, 228, 231, 0.1);
  --border-strong: rgba(228, 228, 231, 0.2);
  --shadow: rgba(0, 0, 0, 0.4);
  --code-bg: #1e1e2e;
  --hover-bg: rgba(99, 102, 241, 0.08);
  --glass-bg: rgba(15, 15, 20, 0.85);
  --glass-border: rgba(255, 255, 255, 0.08);
  --graph-bg: #0f0f14;
}

html.light {
  --bg: #ffffff;
  --bg-secondary: #f4f4f5;
  --bg-tertiary: #e4e4e7;
  --text: #18181b;
  --text-muted: #52525b;
  --text-dim: #a1a1aa;
  --accent: #b45309;
  --accent-light: #d97706;
  --sky: #d97706;
  --border: rgba(24, 24, 27, 0.08);
  --border-strong: rgba(24, 24, 27, 0.15);
  --shadow: rgba(0, 0, 0, 0.08);
  --code-bg: #f8f8f8;
  --hover-bg: rgba(180, 83, 9, 0.06);
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(0, 0, 0, 0.06);
  --graph-bg: #fafafa;
}

/* Category colors */
:root {
  --cat-graphics: #8b5cf6;
  --cat-unity: #10b981;
  --cat-unreal: #3b82f6;
  --cat-blender: #f59e0b;
  --cat-photography: #ec4899;
  --cat-editing: #f97316;
  --cat-digital-twin: #06b6d4;
  --cat-algorithms: #6366f1;
  --cat-frontier: #ef4444;
  --cat-concepts: #8b5cf6;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Space Mono', monospace;
  background: var(--bg);
  color: var(--text);
  letter-spacing: 0.02em;
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

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

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

::selection {
  background: rgba(99, 102, 241, 0.2);
  color: var(--text);
}

html.light ::selection {
  background: rgba(180, 83, 9, 0.2);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--text-dim); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ---------- Navbar ---------- */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 56px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: transform 0.3s ease;
}

.nav-inner {
  max-width: 1600px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  gap: 1.5rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
}

.brand-accent {
  color: var(--accent-light);
  font-weight: 300;
  font-size: 1.3rem;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  background: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

/* Search */
.search-container {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

#search-input {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  padding: 0.4rem 0.6rem 0.4rem 2rem;
  width: 220px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  outline: none;
  transition: all 0.2s;
}

#search-input:focus {
  border-color: var(--accent);
  width: 300px;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

html.light #search-input:focus {
  box-shadow: 0 0 0 3px rgba(180, 83, 9, 0.1);
}

.search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  min-width: 360px;
  max-height: 400px;
  overflow-y: auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  box-shadow: 0 8px 24px var(--shadow);
  z-index: 200;
}

.search-results.hidden { display: none; }

.search-result-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
}

.search-result-item:hover {
  background: var(--hover-bg);
}

.search-result-item:last-child { border-bottom: none; }

.search-result-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.search-result-cat {
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 2px;
}

.search-result-snippet {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
  line-height: 1.4;
}

/* Theme Toggle */
#theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

#theme-toggle:hover {
  color: var(--accent-light);
  border-color: var(--accent);
}

.mobile-only { display: none; }

/* ---------- Layout ---------- */
#app-layout {
  display: flex;
  margin-top: 56px;
  min-height: calc(100vh - 56px);
}

/* ---------- Sidebar ---------- */
#sidebar {
  width: 260px;
  min-width: 260px;
  height: calc(100vh - 56px);
  position: sticky;
  top: 56px;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--bg);
  padding: 1.25rem 0;
  transition: background 0.3s;
}

.sidebar-header {
  padding: 0 1.25rem 0.75rem;
}

.sidebar-header h3 {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  font-weight: 700;
}

.sidebar-category {
  margin-bottom: 0.25rem;
}

.sidebar-cat-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1.25rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.sidebar-cat-header:hover {
  color: var(--text);
  background: var(--hover-bg);
}

.sidebar-cat-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sidebar-cat-arrow {
  margin-left: auto;
  font-size: 0.6rem;
  transition: transform 0.2s;
  color: var(--text-dim);
}

.sidebar-cat-header.open .sidebar-cat-arrow {
  transform: rotate(90deg);
}

.sidebar-cat-items {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
}

.sidebar-cat-items.open {
  max-height: 2000px;
}

.sidebar-item {
  display: block;
  padding: 0.35rem 1.25rem 0.35rem 2.5rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.15s;
  cursor: pointer;
  border-left: 2px solid transparent;
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: 0;
}

.sidebar-item:hover {
  color: var(--text);
  background: var(--hover-bg);
}

.sidebar-item.active {
  color: var(--accent-light);
  border-left-color: var(--accent-light);
  background: var(--hover-bg);
}

/* ---------- Content ---------- */
#content {
  flex: 1;
  min-width: 0;
  padding: 2rem 3rem;
  max-width: 1200px;
}

/* Full-width for interactive articles */
#article-iframe {
  display: block;
  width: 100%;
  border: none;
  border-radius: 8px;
  min-height: 600px;
  background: var(--bg-secondary);
}

.view { display: block; }
.view.hidden { display: none; }

/* ---------- Home View ---------- */
.hero-section {
  margin-bottom: 2.5rem;
}

.hero-section h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

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

.hero-subtitle {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 700px;
  font-weight: 300;
  letter-spacing: 0;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 1.25rem;
}

.stat-item {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.stat-number {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-light);
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.category-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem;
  cursor: pointer;
  transition: all 0.2s;
}

.category-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.category-card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.category-card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.category-card-title {
  font-size: 0.9rem;
  font-weight: 600;
}

.category-card-count {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-left: auto;
}

.category-card-items {
  margin-top: 0.5rem;
}

.category-card-item {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 0.2rem 0;
  letter-spacing: 0;
  cursor: pointer;
  transition: color 0.15s;
}

.category-card-item:hover {
  color: var(--accent-light);
}

/* ---------- Article View ---------- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 3rem;
  position: relative;
}

.article-meta {
  grid-column: 1 / -1;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.article-meta h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.tag {
  display: inline-block;
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  font-weight: 500;
}

.tag.cat-tag {
  background: var(--accent);
  color: white;
  opacity: 0.9;
}

/* Article body typography */
.article-body {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text);
  letter-spacing: 0;
  font-weight: 300;
  min-width: 0;
}

.article-body h1 { font-family: 'Space Mono', monospace; font-size: 1.6rem; font-weight: 700; margin: 2.5rem 0 1rem; letter-spacing: 0.02em; }
.article-body h2 { font-family: 'Space Mono', monospace; font-size: 1.3rem; font-weight: 700; margin: 2rem 0 0.75rem; letter-spacing: 0.02em; color: var(--accent-light); }
.article-body h3 { font-family: 'Space Mono', monospace; font-size: 1.05rem; font-weight: 700; margin: 1.5rem 0 0.5rem; letter-spacing: 0.02em; }
.article-body h4 { font-family: 'Space Mono', monospace; font-size: 0.95rem; font-weight: 700; margin: 1.25rem 0 0.5rem; }

.article-body p { margin-bottom: 1rem; }

.article-body ul, .article-body ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.3rem;
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--bg-secondary);
  border-radius: 0 4px 4px 0;
  color: var(--text-muted);
  font-style: italic;
}

.article-body code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  color: var(--accent-light);
}

.article-body pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 0.82rem;
  line-height: 1.6;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.85rem;
}

.article-body th, .article-body td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.article-body th {
  background: var(--bg-secondary);
  font-family: 'Space Mono', monospace;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.article-body img {
  max-width: 100%;
  border-radius: 6px;
  margin: 1rem 0;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.article-body strong {
  font-weight: 600;
  color: var(--text);
}

.article-body a {
  color: var(--accent-light);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgba(99, 102, 241, 0.3);
}

html.light .article-body a {
  text-decoration-color: rgba(180, 83, 9, 0.3);
}

/* TOC Sidebar */
.toc-sidebar {
  position: sticky;
  top: 80px;
  height: fit-content;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.toc-header {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

#toc-nav a {
  display: block;
  font-size: 0.72rem;
  color: var(--text-dim);
  padding: 0.25rem 0;
  text-decoration: none;
  transition: color 0.15s;
  font-family: 'Space Grotesk', sans-serif;
  letter-spacing: 0;
  border-left: 2px solid transparent;
  padding-left: 0.75rem;
}

#toc-nav a.toc-h3 {
  padding-left: 1.5rem;
  font-size: 0.68rem;
}

#toc-nav a:hover, #toc-nav a.active {
  color: var(--accent-light);
  border-left-color: var(--accent-light);
}

/* Article footer (related) */
.article-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.related-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.related-link {
  font-size: 0.78rem;
  padding: 0.4rem 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  font-family: 'Space Grotesk', sans-serif;
}

.related-link:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

/* ---------- Graph View ---------- */
.graph-header {
  margin-bottom: 1rem;
}

.graph-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.graph-header p {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 300;
  letter-spacing: 0;
}

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

#graph-container {
  width: 100%;
  height: calc(100vh - 240px);
  min-height: 500px;
  background: var(--graph-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

#graph-container svg {
  width: 100%;
  height: 100%;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr;
  }
  .toc-sidebar {
    display: none;
  }
  #content {
    padding: 1.5rem 2rem;
  }
}

@media (max-width: 768px) {
  .mobile-only { display: flex; }
  .nav-links { display: none; }

  #sidebar {
    position: fixed;
    left: -280px;
    top: 56px;
    z-index: 90;
    width: 280px;
    transition: left 0.3s ease;
    box-shadow: 4px 0 12px var(--shadow);
  }

  #sidebar.open { left: 0; }

  #sidebar-overlay {
    position: fixed;
    inset: 0;
    top: 56px;
    background: rgba(0, 0, 0, 0.5);
    z-index: 80;
  }

  #sidebar-overlay.hidden { display: none; }

  #content {
    padding: 1.25rem;
  }

  .hero-section h1 { font-size: 1.5rem; }

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

  #search-input { width: 160px; }
  #search-input:focus { width: 200px; }

  .search-results { min-width: 280px; right: -40px; left: auto; }
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease forwards;
}

/* ---------- Utility ---------- */
.hidden { display: none !important; }