/* =========================================
   DEVTOR.DEV — Global Stylesheet (RPG Fantasy ⚔️✨)
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;600;700;900&family=Crimson+Text:ital,wght@0,400;0,600;1,400&family=Space+Grotesk:wght@400;500;600;700;800&display=swap');

:root {
  /* ── Dark (Dungeon) ── */
  --bg:          #0e0b07;
  --bg-rgb:      14, 11, 7;
  --bg-card:     #1a1208;
  --bg-card-2:   #261b0d;
  --accent:      #d4a017;
  --accent-rgb:  212, 160, 23;
  --accent2:     #8b2635;
  --accent2-rgb: 139, 38, 53;
  --accent3:     #2e7d52;
  --accent3-rgb: 46, 125, 82;
  --text:        #f0e6cc;
  --text-muted:  #9c8a6a;
  --border:      #3d2e14;
  --border-2:    #261b0d;
  --gold:        #d4a017;
  --gold-bright: #f5c842;
  --gold-dim:    #8a6810;
  --crimson:     #8b2635;
  --emerald:     #2e7d52;
  --rune-glow:   rgba(212, 160, 23, 0.35);
  --success:     #2e7d52;
  --success-rgb: 46, 125, 82;
  --error:       #8b2635;
  --error-rgb:   139, 38, 53;
  --warn:        #d4a017;
  --warn-rgb:    212, 160, 23;
  --font-mono:   'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-rpg:    'Cinzel', Georgia, serif;
  --font-body:   'Crimson Text', Georgia, serif;
  --radius:      2px;
  --radius-sm:   2px;

  --bg-nav:           rgba(14, 11, 7, 0.94);
  --btn-primary-bg:   #8b2635;
  --btn-primary-text: #f0e6cc;
  --comic-shadow:     none;
  --comic-shadow-hover: none;
  --rune-border:      1px solid rgba(212,160,23,0.25);
  --rule:             var(--border);
}

/* Light theme (Parchment) */
@media (prefers-color-scheme: light) {
  :root {
    --bg:          #f2e8d0;
    --bg-rgb:      242, 232, 208;
    --bg-card:     #fdf6e3;
    --bg-card-2:   #ede0c0;
    --accent:      #8a5c0a;
    --accent-rgb:  138, 92, 10;
    --accent2:     #6b1a2a;
    --accent2-rgb: 107, 26, 42;
    --accent3:     #1f5c38;
    --accent3-rgb: 31, 92, 56;
    --text:        #2a1a08;
    --text-muted:  #6b5030;
    --border:      #2a1a08;
    --border-2:    #c4a87a;
    --gold:        #8a5c0a;
    --gold-bright: #c08010;
    --gold-dim:    #d4b87a;
    --crimson:     #6b1a2a;
    --emerald:     #1f5c38;
    --rune-glow:   rgba(138, 92, 10, 0.2);
    --success:     #1f5c38;
    --success-rgb: 31, 92, 56;
    --error:       #6b1a2a;
    --error-rgb:   107, 26, 42;
    --warn:        #8a5c0a;
    --warn-rgb:    138, 92, 10;

    --bg-nav:           rgba(242, 232, 208, 0.94);
    --btn-primary-bg:   #6b1a2a;
    --btn-primary-text: #fdf6e3;
    --comic-shadow:     none;
    --comic-shadow-hover: none;
    --rune-border:      1px solid rgba(138,92,10,0.25);
  }
}

/* Explicit data-theme overrides */
[data-theme="dark"] {
  --bg:          #0e0b07;
  --bg-rgb:      14, 11, 7;
  --bg-card:     #1a1208;
  --bg-card-2:   #261b0d;
  --accent:      #d4a017;
  --accent-rgb:  212, 160, 23;
  --accent2:     #8b2635;
  --accent2-rgb: 139, 38, 53;
  --accent3:     #2e7d52;
  --accent3-rgb: 46, 125, 82;
  --text:        #f0e6cc;
  --text-muted:  #9c8a6a;
  --border:      #3d2e14;
  --border-2:    #261b0d;
  --gold:        #d4a017;
  --gold-bright: #f5c842;
  --gold-dim:    #8a6810;
  --crimson:     #8b2635;
  --emerald:     #2e7d52;
  --rune-glow:   rgba(212, 160, 23, 0.35);
  --success:     #2e7d52;
  --success-rgb: 46, 125, 82;
  --error:       #8b2635;
  --error-rgb:   139, 38, 53;
  --warn:        #d4a017;
  --warn-rgb:    212, 160, 23;

  --bg-nav:           rgba(14, 11, 7, 0.94);
  --btn-primary-bg:   #8b2635;
  --btn-primary-text: #f0e6cc;
  --comic-shadow:     none;
  --comic-shadow-hover: none;
  --rune-border:      1px solid rgba(212,160,23,0.25);
}

[data-theme="light"] {
  --bg:          #f2e8d0;
  --bg-rgb:      242, 232, 208;
  --bg-card:     #fdf6e3;
  --bg-card-2:   #ede0c0;
  --accent:      #8a5c0a;
  --accent-rgb:  138, 92, 10;
  --accent2:     #6b1a2a;
  --accent2-rgb: 107, 26, 42;
  --accent3:     #1f5c38;
  --accent3-rgb: 31, 92, 56;
  --text:        #2a1a08;
  --text-muted:  #6b5030;
  --border:      #2a1a08;
  --border-2:    #c4a87a;
  --gold:        #8a5c0a;
  --gold-bright: #c08010;
  --gold-dim:    #d4b87a;
  --crimson:     #6b1a2a;
  --emerald:     #1f5c38;
  --rune-glow:   rgba(138, 92, 10, 0.2);
  --success:     #1f5c38;
  --success-rgb: 31, 92, 56;
  --error:       #6b1a2a;
  --error-rgb:   107, 26, 42;
  --warn:        #8a5c0a;
  --warn-rgb:    138, 92, 10;

  --bg-nav:           rgba(242, 232, 208, 0.94);
  --btn-primary-bg:   #6b1a2a;
  --btn-primary-text: #fdf6e3;
  --comic-shadow:     none;
  --comic-shadow-hover: none;
  --rune-border:      1px solid rgba(138,92,10,0.25);
}

/* Smooth theme transitions */
body, .navbar, .card, .btn, textarea, input, select,
.cs-sidebar, .cs-item, pre, .tabs, .tab, .btn-back, .theme-toggle-btn {
  transition: background 0.25s ease, background-color 0.25s ease,
              border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease, transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(212,160,23,0.07) 0%, transparent 70%),
    repeating-linear-gradient(0deg, transparent, transparent 47px, rgba(var(--accent-rgb),0.03) 47px, rgba(var(--accent-rgb),0.03) 48px),
    repeating-linear-gradient(90deg, transparent, transparent 47px, rgba(var(--accent-rgb),0.03) 47px, rgba(var(--accent-rgb),0.03) 48px);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

h1, h2, h3, .logo-text, .hero-badge, .stat-num, .cs-section-title {
  font-family: var(--font-rpg);
  letter-spacing: 0.06em;
}

/* ── Canvas background ── */
#bg-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ── Page wrapper ── */
.page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

/* ── Nav bar ── */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2.5px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
}

.navbar .logo-icon {
  width: 32px; height: 32px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  border: 1.5px solid var(--border);
}

.navbar .logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.08);
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 700;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  font-family: inherit;
}
.btn-back:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 5rem 2rem 3rem;
  position: relative;
  overflow: hidden;
}

/* Rune glow texture */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(212,160,23,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 80%, rgba(139,38,53,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 80% 80%, rgba(46,125,82,0.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}
.hero > * { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 0.25rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
}

.hero h1 .gradient {
  color: var(--accent);
}

.hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 480px;
  margin: 0 auto 1.5rem;
}

/* Decorative deco pills */
.hero-deco {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.deco-pill {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.7rem;
  border-radius: 12px;
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  color: var(--text-muted);
  background: rgba(var(--accent-rgb), 0.04);
}

/* ── Section title ── */
.section-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-rpg);
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(var(--accent-rgb), 0.5), transparent);
}

/* ── Card grid — lattice: container carries the top/left rule, cells carry
   right/bottom, so the whole block reads as one ruled table, not stacked boxes ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0;
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

/* Ledger entry — a cell in the lattice grid, not a floating tile.
   Border lives on right/bottom only; the grid container supplies the
   top/left edge, so adjoining cells share a single rule (no doubled lines). */
.card {
  background: var(--bg-card);
  border: 0;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 1.1rem 1.2rem;
  text-decoration: none;
  color: var(--text);
  transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  cursor: pointer;
  box-shadow: inset 3px 0 0 transparent;
}

.card:hover,
.card.sheet-card:hover {
  background: rgba(var(--accent-rgb), 0.05);
  box-shadow: inset 3px 0 0 var(--accent);
}

.card-icon {
  font-size: 1.6rem; line-height: 1;
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.card-icon svg {
  width: 30px; height: 30px;
  display: block;
  transition: filter 0.2s ease;
}
.card:hover .card-icon svg {
  filter: drop-shadow(0 0 6px rgba(212,160,23,0.4));
}
.card-title { font-weight: 700; font-size: 0.92rem; }
.card-desc  { font-size: 0.78rem; color: var(--text-muted); line-height: 1.4; }

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-top: auto;
  width: fit-content;
  border: 1px solid currentColor;
  background: transparent;
}

.card-tag.tools  { color: var(--accent); }
.card-tag.sheet  { color: var(--accent2); }
.card-tag.po     { color: var(--accent3); }
.card-tag.fun    { color: var(--accent); }
.card-tag.dart   { color: var(--accent3); }
.card-tag.swift  { color: #b5651d; }
.card-tag.kotlin { color: var(--accent2); }
.card-tag.flutter{ color: #4a9cc2; }

/* ── Tool page layout ── */
.tool-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.tool-header { margin-bottom: 2rem; }

.tool-header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.3rem;
  letter-spacing: -0.02em;
}

.tool-header p { color: var(--text-muted); font-size: 0.9rem; }

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 0.3rem;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.3rem;
  margin-bottom: 1.5rem;
  width: fit-content;
}

.tab {
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-muted);
  transition: all 0.2s;
  font-family: inherit;
}

.tab.active {
  background: var(--accent);
  color: #0e0b07;
  font-family: var(--font-rpg);
  letter-spacing: 0.04em;
}
.tab:hover:not(.active) { color: var(--text); background: var(--bg-card-2); }

/* ── Panels ── */
.panel { display: none; }
.panel.active { display: block; }

/* ── Inputs / Textareas ── */
textarea, input[type="text"], input[type="number"], select {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  outline: none;
  resize: vertical;
}

textarea:focus, input[type="text"]:focus, input[type="number"]:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.15);
}

textarea { min-height: 200px; }
select { cursor: pointer; }
select option { background: var(--bg-card); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  border: 1.5px solid var(--border);
  transition: border-color 0.15s ease, background 0.15s ease, filter 0.15s ease;
  font-family: inherit;
  letter-spacing: 0.01em;
}
.btn:hover { filter: brightness(1.12); }

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

.btn-secondary {
  background: var(--bg-card-2);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); }

.btn-danger { background: var(--error); color: #ffffff; border: 1.5px solid var(--error); }

.btn-sm   { padding: 0.35rem 0.8rem; font-size: 0.8rem; }
.btn-icon { width: 36px; height: 36px; padding: 0; justify-content: center; }

/* ── Code blocks ── */
.code-block {
  position: relative;
  background: #06010e;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.code-block pre {
  padding: 1.2rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #fce4ff;
  white-space: pre;
  tab-size: 2;
}

.code-block .code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: rgba(255,255,255,0.02);
  border-bottom: 2px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.copy-btn {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  font-weight: 700;
}
.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.copy-btn.copied { color: var(--success); border-color: var(--success); }

/* ── Two-column layout ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
@media (max-width: 768px) { .two-col { grid-template-columns: 1fr; } }

.col-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.4rem;
}

/* ── Toolbar row ── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

/* ── Status message ── */
.status-msg {
  font-size: 0.8rem;
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
  display: none;
}
.status-msg.show { display: inline-block; }
.status-msg.ok  { background: rgba(0,229,200,0.1); color: var(--success); }
.status-msg.err { background: rgba(255,77,109,0.1); color: var(--error); }

/* ── Cheat sheet layout ── */
.cs-layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 900px) {
  .cs-layout { grid-template-columns: 1fr; }
  .cs-sidebar { display: none; }
}

.cs-sidebar {
  position: sticky;
  top: 80px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.cs-sidebar h3 {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.cs-sidebar a {
  display: block;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.15s;
}
.cs-sidebar a:hover { color: var(--accent); background: rgba(var(--accent-rgb), 0.06); }
.cs-sidebar a.active {
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  font-weight: 700;
}

/* ── Cheat sheet content ── */
.cs-search-wrap {
  position: relative;
  margin-bottom: 1.5rem;
}
.cs-search {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.8rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  font-family: inherit;
}
.cs-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.15);
}
.cs-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.cs-section { margin-bottom: 2.5rem; }

.cs-section-title {
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2.5px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cs-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 2px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: border-color 0.15s ease;
}
.cs-item:hover {
  border-left-color: var(--accent);
}

.cs-item-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  gap: 1rem;
}

.cs-item-info { flex: 1; }

.cs-item-title {
  font-weight: 700;
  font-size: 0.88rem;
  margin-bottom: 0.15rem;
}

.cs-item-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.cs-item pre {
  background: #06010e;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: #fce4ff;
  overflow-x: auto;
  border-top: 1px solid var(--border);
  tab-size: 2;
}

.cs-item.hidden { display: none; }

/* Syntax highlight classes */
.kw  { color: #ff79c6; }              /* keywords */
.st  { color: #f1fa8c; }              /* strings */
.cm  { color: #7a4f94; font-style: italic; } /* comments */
.fn  { color: #00e5c8; }              /* functions — teal */
.nu  { color: #bd93f9; }              /* numbers */
.ty  { color: #8be9fd; }              /* types */
.op  { color: #ff79c6; }              /* operators */
.co  { color: #ffb86c; }              /* constants/special */

/* ── Mermaid viewer ── */
.mermaid-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  cursor: grab;
}
.mermaid-container.grabbing { cursor: grabbing; }
.mermaid-inner { transform-origin: center center; transition: none; user-select: none; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(var(--accent-rgb), 0.5); }

/* ── Animations ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ── Stat bar ── */
.stat-bar {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}
.stat { text-align: center; }
.stat-num {
  font-size: 2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent);
}
.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Site footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-logo {
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--accent);
}
.footer-sep { color: var(--border-2); }

/* ── Misc utilities ── */
.divider { height: 1px; background: var(--border); margin: 2rem 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }
.flex-wrap { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.accent { color: var(--accent); }
.muted  { color: var(--text-muted); }
.mono   { font-family: var(--font-mono); }

/* ── Image preview ── */
.img-preview {
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  padding: 2rem;
}
.img-preview:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.img-preview img { max-width: 100%; max-height: 300px; border-radius: 8px; object-fit: contain; }

/* ── Tag chips ── */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.chip-blue   { background: rgba(var(--accent-rgb), 0.1);  color: var(--accent); }
.chip-purple { background: rgba(var(--accent2-rgb), 0.1); color: var(--accent2); }
.chip-green  { background: rgba(var(--success-rgb), 0.1); color: var(--success); }
.chip-orange { background: rgba(var(--warn-rgb), 0.1);    color: var(--warn); }

/* ── Theme Toggle Button ── */
.nav-right-group {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.theme-toggle-btn {
  background: var(--bg-card-2);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
}

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

.theme-toggle-btn svg {
  position: absolute;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s ease;
}

/* Dark: Moon visible */
.theme-toggle-btn .sun-icon  { opacity: 0; transform: rotate(90deg) scale(0.5); }
.theme-toggle-btn .moon-icon { opacity: 1; transform: rotate(0) scale(1); }

/* Light: Sun visible */
[data-theme="light"] .theme-toggle-btn .sun-icon  { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle-btn .moon-icon { opacity: 0; transform: rotate(-90deg) scale(0.5); }

/* ── Language toggle button ─────────────────────────────────── */
.lang-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--text);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 5px 12px;
  border-radius: 20px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
  font-family: inherit;
  line-height: 1;
  flex-shrink: 0;
}
.lang-btn:hover {
  background: rgba(255, 255, 255, 0.13);
  border-color: rgba(255, 255, 255, 0.28);
  transform: scale(1.05);
}
[data-theme="light"] .lang-btn,
@media (prefers-color-scheme: light) {
  .lang-btn {
    background: rgba(0, 0, 0, 0.06);
    border-color: rgba(0, 0, 0, 0.14);
  }
  .lang-btn:hover {
    background: rgba(0, 0, 0, 0.12);
    border-color: rgba(0, 0, 0, 0.24);
  }
}