/* ==========================================================================
   DataForge Design System & Theme Styles
   ========================================================================== */

/* Theme Variables Definition */
:root {
  /* Common variables */
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', sfmono-regular, Consolas, monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-height: 72px;
}

/* 1. Dark Theme (Default) */
body.dark-theme {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-glass: rgba(17, 24, 39, 0.7);
  --bg-code: #090d16;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-active: rgba(255, 255, 255, 0.2);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --accent-color: #00f2fe;
  --accent-secondary: #4facfe;
  --accent-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --accent-glow: rgba(0, 242, 254, 0.15);
  
  --banner-tip-bg: rgba(16, 185, 129, 0.1);
  --banner-tip-border: rgba(16, 185, 129, 0.2);
  --banner-tip-text: #34d399;
  
  --banner-note-bg: rgba(59, 130, 246, 0.1);
  --banner-note-border: rgba(59, 130, 246, 0.2);
  --banner-note-text: #60a5fa;

  --tag-feat-bg: rgba(0, 242, 254, 0.1);
  --tag-feat-text: #00f2fe;
  --tag-fix-bg: rgba(239, 68, 68, 0.1);
  --tag-fix-text: #f87171;
  --tag-imp-bg: rgba(245, 158, 11, 0.1);
  --tag-imp-text: #fbbf24;
  
  --grid-pattern: rgba(255, 255, 255, 0.03);
}

/* 2. Light Theme */
body.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.8);
  --bg-code: #f1f5f9;
  --border-color: rgba(15, 23, 42, 0.08);
  --border-active: rgba(15, 23, 42, 0.2);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --accent-color: #2563eb;
  --accent-secondary: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  --accent-glow: rgba(37, 99, 235, 0.12);
  
  --banner-tip-bg: rgba(16, 185, 129, 0.06);
  --banner-tip-border: rgba(16, 185, 129, 0.3);
  --banner-tip-text: #059669;
  
  --banner-note-bg: rgba(59, 130, 246, 0.06);
  --banner-note-border: rgba(59, 130, 246, 0.3);
  --banner-note-text: #2563eb;

  --tag-feat-bg: rgba(37, 99, 235, 0.08);
  --tag-feat-text: #2563eb;
  --tag-fix-bg: rgba(220, 38, 38, 0.08);
  --tag-fix-text: #dc2626;
  --tag-imp-bg: rgba(217, 119, 6, 0.08);
  --tag-imp-text: #d97706;
  
  --grid-pattern: rgba(15, 23, 42, 0.02);
}

/* 3. Nordic Frost Theme */
body.nordic-theme {
  --bg-primary: #2e3440;
  --bg-secondary: #3b4252;
  --bg-tertiary: #434c5e;
  --bg-glass: rgba(59, 66, 82, 0.85);
  --bg-code: #242933;
  --border-color: rgba(236, 239, 244, 0.1);
  --border-active: rgba(236, 239, 244, 0.25);
  --text-primary: #eceff4;
  --text-secondary: #d8dee9;
  --text-muted: #9fabbc;
  
  --accent-color: #88c0d0;
  --accent-secondary: #81a1c1;
  --accent-gradient: linear-gradient(135deg, #88c0d0 0%, #81a1c1 100%);
  --accent-glow: rgba(136, 192, 208, 0.2);
  
  --banner-tip-bg: rgba(163, 190, 140, 0.1);
  --banner-tip-border: rgba(163, 190, 140, 0.3);
  --banner-tip-text: #a3be8c;
  
  --banner-note-bg: rgba(129, 161, 193, 0.1);
  --banner-note-border: rgba(129, 161, 193, 0.3);
  --banner-note-text: #81a1c1;

  --tag-feat-bg: rgba(136, 192, 208, 0.15);
  --tag-feat-text: #88c0d0;
  --tag-fix-bg: rgba(191, 97, 106, 0.15);
  --tag-fix-text: #bf616a;
  --tag-imp-bg: rgba(208, 135, 112, 0.15);
  --tag-imp-text: #d08770;
  
  --grid-pattern: rgba(236, 239, 244, 0.02);
}

/* 4. Cyberpunk Neon Theme */
body.cyberpunk-theme {
  --bg-primary: #0d0015;
  --bg-secondary: #1a0029;
  --bg-tertiary: #2e0047;
  --bg-glass: rgba(26, 0, 41, 0.8);
  --bg-code: #06000a;
  --border-color: rgba(255, 0, 127, 0.2);
  --border-active: rgba(0, 255, 204, 0.6);
  --text-primary: #ffffff;
  --text-secondary: #d8bcf5;
  --text-muted: #8862ab;
  
  --accent-color: #00ffcc;
  --accent-secondary: #ff007f;
  --accent-gradient: linear-gradient(135deg, #00ffcc 0%, #ff007f 100%);
  --accent-glow: rgba(0, 255, 204, 0.25);
  
  --banner-tip-bg: rgba(0, 255, 204, 0.08);
  --banner-tip-border: rgba(0, 255, 204, 0.3);
  --banner-tip-text: #00ffcc;
  
  --banner-note-bg: rgba(255, 0, 127, 0.08);
  --banner-note-border: rgba(255, 0, 127, 0.3);
  --banner-note-text: #ff007f;

  --tag-feat-bg: rgba(0, 255, 204, 0.15);
  --tag-feat-text: #00ffcc;
  --tag-fix-bg: rgba(255, 59, 59, 0.15);
  --tag-fix-text: #ff5757;
  --tag-imp-bg: rgba(255, 240, 0, 0.15);
  --tag-imp-text: #ffff00;
  
  --grid-pattern: rgba(255, 0, 127, 0.05);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* Grid Background */
.grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background-image: 
    linear-gradient(to right, var(--grid-pattern) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-pattern) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse at top, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at top, black 40%, transparent 80%);
  z-index: 1;
}

/* Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Custom Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  transition: background-color var(--transition-normal), border-bottom var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  z-index: 102;
}

.logo span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-icon {
  color: var(--accent-color);
  width: 28px;
  height: 28px;
}

/* Desktop Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.03);
}

body.light-theme .nav-link:hover {
  background-color: rgba(15, 23, 42, 0.03);
}

.nav-link.active {
  color: var(--accent-color);
  font-weight: 600;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-active);
  background-color: rgba(255, 255, 255, 0.05);
}

body.light-theme .icon-btn:hover {
  background-color: rgba(0, 0, 0, 0.03);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

/* Theme Toggle Details */
body.dark-theme .moon-icon,
body.light-theme .sun-icon,
body.nordic-theme .sun-icon,
body.cyberpunk-theme .sun-icon {
  display: none;
}

/* GitHub Button */
.github-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  transition: all var(--transition-fast);
}

.github-btn:hover {
  border-color: var(--border-active);
  transform: translateY(-1px);
}

/* Mobile Menu Trigger */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  z-index: 102;
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

/* Mobile Menu Drawer */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  z-index: 101;
  padding: 96px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu.open {
  right: 0;
}

.mobile-link {
  font-size: 1.1rem;
  font-weight: 500;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.mobile-link:hover, .mobile-link.active {
  color: var(--accent-color);
  background-color: rgba(255, 255, 255, 0.03);
}

.mobile-actions {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

/* Tab panes switching */
.tab-pane {
  display: none;
  animation: fadeIn 0.4s ease forwards;
}

.tab-pane.active {
  display: block;
}

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

/* Main Content Wrapper */
.main-content {
  padding-top: var(--header-height);
  min-height: calc(100vh - var(--header-height) - 150px);
  position: relative;
  z-index: 2;
}

/* Common Section Typography */
.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
}

/* Buttons System */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #000;
  box-shadow: 0 4px 20px var(--accent-glow);
}

body.light-theme .btn-primary {
  color: #fff;
}

body.cyberpunk-theme .btn-primary {
  color: #000;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  border: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-primary);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--border-active);
  background-color: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

/* ==========================================================================
   PAGE: OVERVIEW
   ========================================================================== */

/* Hero Section */
.hero-section {
  padding: 80px 0;
  position: relative;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-text {
  max-width: 620px;
}

.badge-new {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 9999px;
  background-color: rgba(0, 242, 254, 0.08);
  color: var(--accent-color);
  border: 1px solid rgba(0, 242, 254, 0.15);
  margin-bottom: 24px;
}

.hero-text h1 {
  font-size: 3.4rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero Image */
.hero-visual {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image {
  max-width: 100%;
  height: auto;
  /* Image has baked-in perspective/shadow, no frame needed */
  display: block;
}


/* Features Section */
.features-section {
  padding: 60px 0 100px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--accent-color);
  box-shadow: 0 10px 30px var(--accent-glow);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color);
  margin-bottom: 24px;
  transition: all var(--transition-fast);
}

.feature-card:hover .feature-icon {
  background: var(--accent-gradient);
  color: #000;
}

body.light-theme .feature-card:hover .feature-icon {
  color: #fff;
}

body.cyberpunk-theme .feature-card:hover .feature-icon {
  color: #000;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   PAGE: DOCUMENTATION
   ========================================================================== */

.docs-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  padding-top: 40px;
  padding-bottom: 80px;
}

/* Docs Sidebar */
.docs-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 20px);
  height: calc(100vh - var(--header-height) - 60px);
  overflow-y: auto;
  padding-right: 12px;
}

/* Search Box */
.search-box {
  position: relative;
  margin-bottom: 24px;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

#docs-search {
  width: 100%;
  padding: 12px 16px 12px 42px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

#docs-search:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

/* Docs menu list */
.docs-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.docs-link {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.docs-link:hover {
  color: var(--text-primary);
  background-color: rgba(255,255,255,0.02);
}

body.light-theme .docs-link:hover {
  background-color: rgba(15, 23, 42, 0.02);
}

.docs-link.active {
  color: var(--accent-color);
  background-color: rgba(0, 242, 254, 0.05);
  font-weight: 600;
}

body.light-theme .docs-link.active {
  background-color: rgba(37, 99, 235, 0.06);
}

body.cyberpunk-theme .docs-link.active {
  background-color: rgba(0, 255, 204, 0.08);
}

/* Docs Content */
.docs-content {
  max-width: 820px;
}

.doc-section {
  display: none;
  animation: fadeIn 0.3s ease forwards;
}

.doc-section.active {
  display: block;
}

.doc-section h2 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.doc-section h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 16px;
}

.doc-section p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.doc-section ul, .doc-section ol {
  margin-bottom: 24px;
  padding-left: 20px;
}

.doc-section ul {
  list-style: disc;
}

.doc-section ol {
  list-style: decimal;
}

.doc-section li {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.doc-section code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background-color: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-color);
}

.doc-section pre {
  background-color: var(--bg-code);
  border: 1px solid var(--border-color);
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 24px 0;
}

.doc-section pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.85rem;
}

.doc-section pre .comment {
  color: var(--text-muted);
  font-style: italic;
}

/* Tables in Docs */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

th, td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

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

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

/* Callout Banners */
.note-box, .tip-box, .warning-box {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border-left: 4px solid;
  margin: 24px 0;
  font-size: 0.95rem;
}

.note-box {
  background-color: var(--banner-note-bg);
  border-color: var(--banner-note-border);
  color: var(--banner-note-text);
}

.note-box strong, .tip-box strong, .warning-box strong {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
}

.tip-box {
  background-color: var(--banner-tip-bg);
  border-color: var(--banner-tip-border);
  color: var(--banner-tip-text);
}

.warning-box {
  background-color: var(--tag-fix-bg);
  border-color: var(--tag-fix-text);
  color: var(--tag-fix-text);
}

/* Documentation Images */
.doc-image {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 32px 0;
}

.doc-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.doc-image figcaption {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
}

/* ==========================================================================
   PAGE: RELEASES
   ========================================================================== */

.releases-container {
  padding-top: 40px;
  padding-bottom: 80px;
  max-width: 800px;
}

.releases-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
  position: relative;
  padding-left: 20px;
}

.releases-list::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--border-color);
}

.release-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
}

.release-card::before {
  content: '';
  position: absolute;
  left: -25px;
  top: 32px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent-color);
  box-shadow: 0 0 0 4px var(--bg-primary), 0 0 10px var(--accent-color);
}

.release-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.release-ver {
  font-size: 1.5rem;
  font-weight: 700;
  display: block;
}

.release-date {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.release-badge {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 9999px;
  background: var(--accent-gradient);
  color: #000;
}

body.light-theme .release-badge {
  color: #fff;
}

body.cyberpunk-theme .release-badge {
  color: #000;
}

.release-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.release-body ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 32px;
}

.release-body li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  flex-shrink: 0;
  margin-top: 3px;
}

.badge-feat {
  background-color: var(--tag-feat-bg);
  color: var(--tag-feat-text);
}

.badge-fix {
  background-color: var(--tag-fix-bg);
  color: var(--tag-fix-text);
}

.badge-imp {
  background-color: var(--tag-imp-bg);
  color: var(--tag-imp-text);
}

/* Downloads Section */
.downloads-section {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

.downloads-section h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.download-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-download {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-tertiary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.btn-download:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  background-color: rgba(0, 242, 254, 0.02);
  transform: translateX(4px);
}

.btn-download svg {
  flex-shrink: 0;
}

/* ==========================================================================
   PAGE: THEMES & EXTENSIONS
   ========================================================================== */

.themes-ext-container {
  padding-top: 40px;
  padding-bottom: 80px;
}

.sub-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
}

.sub-tab-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  padding: 8px 24px;
  cursor: pointer;
  position: relative;
  transition: color var(--transition-fast);
}

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

.sub-tab-btn.active {
  color: var(--accent-color);
}

.sub-tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -17px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent-color);
}

.subtab-pane {
  display: none;
  animation: fadeIn 0.3s ease forwards;
}

.subtab-pane.active {
  display: block;
}

/* Themes Layout */
.themes-grid-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.theme-card-item {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.theme-card-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
  border-color: var(--border-active);
}

.theme-preview {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border-color);
}

.theme-bubble-row {
  display: flex;
  gap: 8px;
}

.color-bubble {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.theme-info {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.theme-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.theme-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  flex: 1;
}

.btn-theme-apply {
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 10px;
  width: 100%;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-theme-apply:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.info-banner {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.info-banner h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.info-banner p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Extensions Developer Guide */
.extensions-dev-guide {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 48px;
}

.extensions-dev-guide h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.extensions-dev-guide h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.extensions-dev-guide p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.extensions-dev-guide pre {
  background-color: var(--bg-code);
  border: 1px solid var(--border-color);
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 0.85rem;
}

.extensions-dev-guide code {
  font-family: var(--font-mono);
}

.extensions-dev-guide .comment {
  color: var(--text-muted);
  font-style: italic;
}

/* Extensions Card List */
.ext-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  transition: all var(--transition-normal);
}

.ext-card:hover {
  border-color: var(--border-active);
  transform: translateY(-2px);
}

.ext-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.ext-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.ext-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.ext-tags {
  display: flex;
  gap: 8px;
}

.ext-tag-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background-color: var(--bg-tertiary);
  color: var(--accent-color);
  padding: 4px 10px;
  border-radius: 4px;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
  border-top: 1px solid var(--border-color);
  padding: 48px 0;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  margin-top: 80px;
  transition: background-color var(--transition-normal);
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 20px;
  font-size: 0.9rem;
}

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

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */

/* <= 960px (Tablets / Small screens) */
@media (max-width: 960px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .hero-text {
    max-width: 100%;
    margin: 0 auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-visual {
    max-width: 540px;
    margin: 0 auto;
  }

  .docs-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .docs-sidebar {
    position: static;
    height: auto;
    overflow-y: visible;
    padding-right: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
  }
  
  .docs-menu {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  
  .docs-link {
    padding: 6px 12px;
    font-size: 0.85rem;
  }
}

/* <= 768px (Mobile navigation switch) */
@media (max-width: 768px) {
  .nav {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .header-actions {
    margin-right: 12px;
  }
}

/* <= 576px (Small mobile screens) */
@media (max-width: 576px) {
  .hero-text h1 {
    font-size: 2.3rem;
  }
  
  .hero-lead {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .section-subtitle {
    font-size: 0.95rem;
    margin-bottom: 32px;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

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

  .feature-card {
    padding: 24px;
  }
  
  .docs-menu {
    flex-direction: column;
    width: 100%;
  }
  
  .docs-link {
    width: 100%;
  }

  .release-card {
    padding: 20px;
  }
  
  .release-card::before {
    display: none;
  }
  
  .releases-list {
    padding-left: 0;
  }
  
  .releases-list::before {
    display: none;
  }
}

/* Language Switcher Button Styles */
.lang-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 38px;
}
.lang-btn:hover {
  background-color: var(--bg-item-hover);
  border-color: var(--accent-color);
  color: var(--accent-color);
}
body.light-theme .lang-btn:hover {
  background-color: rgba(0, 0, 0, 0.03);
}

/* Multi-language Visibility Rules */
[lang="en"] {
  display: none !important;
}
body.lang-en [lang="ru"] {
  display: none !important;
}
body.lang-en [lang="en"] {
  display: revert !important;
}

/* Ko-fi Support Button Styling */
.kofi-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 94, 91, 0.25);
  background-color: rgba(255, 94, 91, 0.1);
  color: #ff5e5b;
  transition: all var(--transition-fast);
}

.kofi-btn:hover {
  background-color: rgba(255, 94, 91, 0.2);
  border-color: #ff5e5b;
  transform: translateY(-1px);
}

body.light-theme .kofi-btn {
  background-color: rgba(255, 94, 91, 0.05);
}

/* Responsive collapse for header action text on mobile */
@media (max-width: 600px) {
  .github-btn span, .kofi-btn span {
    display: none !important;
  }
  .github-btn, .kofi-btn {
    padding: 8px !important;
    width: 40px;
    height: 40px;
    justify-content: center;
  }
}

/* Documentation Chapters collapsible styling */
.docs-chapter {
  display: flex;
  flex-direction: column;
}

.docs-chapter-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  padding: 14px 16px 6px 16px;
  margin-top: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  cursor: pointer;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color var(--transition-fast);
}

.docs-chapter-title:hover {
  color: var(--text-primary);
}

.docs-chapter-title::after {
  content: "▾";
  font-size: 0.8rem;
  opacity: 0.5;
  transition: transform 0.2s ease-out;
}

.docs-chapter.collapsed .docs-chapter-title::after {
  transform: rotate(-90deg);
}

body.light-theme .docs-chapter-title {
  color: #64748b;
  border-bottom: 1px solid rgba(15,23,42,0.08);
}

.docs-chapter-items {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 500px; /* Allow smooth height slide */
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
}

.docs-chapter.collapsed .docs-chapter-items {
  max-height: 0;
}

/* Documentation Next/Prev Navigation Footers */
.doc-section-nav {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

body.light-theme .doc-section-nav {
  border-top: 1px solid rgba(15, 23, 42, 0.08);
}

.doc-nav-btn {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  max-width: 48%;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-secondary) !important;
  transition: all var(--transition-fast) ease-out;
  text-decoration: none !important;
  cursor: pointer;
}

body.light-theme .doc-nav-btn {
  background: rgba(15, 23, 42, 0.01);
  border: 1px solid rgba(15, 23, 42, 0.05);
}

.doc-nav-btn:hover {
  background: rgba(0, 242, 254, 0.04);
  border-color: var(--accent-color);
  color: var(--text-primary) !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 242, 254, 0.05);
}

body.light-theme .doc-nav-btn:hover {
  background: rgba(37, 99, 235, 0.04);
  border-color: var(--accent-color);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.05);
}

.doc-nav-prev {
  text-align: left;
}

.doc-nav-next {
  text-align: right;
  justify-content: flex-end;
}

.nav-btn-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.doc-nav-btn .arrow {
  font-size: 1.2rem;
  transition: transform var(--transition-fast);
}

.doc-nav-prev:hover .arrow {
  transform: translateX(-4px);
}

.doc-nav-next:hover .arrow {
  transform: translateX(4px);
}