/* ============================================================
   CocoKits Token Architecture — Documentation Website
   main.css — Complete stylesheet
   ============================================================ */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Custom Properties ─────────────────────────────────────── */
:root[data-theme="dark"],
:root {
  --bg-page:     #0D1220;
  --bg-surface:  #141C2E;
  --bg-elevated: #1C263D;
  --bg-highest:  #243050;
  --bg-card:     #1A243A;

  --accent:       #6183F7;
  --accent-hover: #7B98FF;
  --accent-2:     #9B72FA;
  --teal:         #34D5C2;
  --amber:        #F5C245;
  --green:        #3DDA8A;
  --red:          #F95C5C;
  --orange:       #FB8C42;

  --text:     #E8EAF2;
  --text-mid: #C7CDD9;
  --text-dim: #8EA0C2;
  --text-faint: #5A6E90;

  --border:        #2E3D5A;
  --border-subtle: #1E2D46;

  --code-bg:   #080F1C;
  --code-text: #B8CFF0;

  --sidebar-bg:    #0B1221;
  --sidebar-width: 264px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.4);
  --shadow-md:  0 4px 16px rgba(0,0,0,.5);
  --shadow-lg:  0 8px 32px rgba(0,0,0,.6);
  --shadow-glow: 0 0 24px rgba(97,131,247,.2);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --tier1: #34D5C2;
  --tier2: #6183F7;
  --tier3: #F5C245;

  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg-page:     #F4F6FF;
  --bg-surface:  #FFFFFF;
  --bg-elevated: #EEF2FF;
  --bg-highest:  #E3EAFF;
  --bg-card:     #FAFBFF;

  --accent:       #4A69F4;
  --accent-hover: #3A5AE0;
  --accent-2:     #7B55E0;
  --teal:         #0BA898;
  --amber:        #D97706;
  --green:        #059669;
  --red:          #DC2626;
  --orange:       #EA7215;

  --text:     #0F172A;
  --text-mid: #334155;
  --text-dim: #64748B;
  --text-faint: #94A3B8;

  --border:        #CBD5E1;
  --border-subtle: #E2E8F0;

  --code-bg:   #F1F5F9;
  --code-text: #334155;

  --sidebar-bg: #FFFFFF;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
  --shadow-md:  0 4px 16px rgba(0,0,0,.1);
  --shadow-lg:  0 8px 32px rgba(0,0,0,.12);
  --shadow-glow: 0 0 24px rgba(74,105,244,.15);

  color-scheme: light;
}

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

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-page);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Scroll Progress Bar ───────────────────────────────────── */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--teal));
  z-index: 9999;
  transition: width .1s linear;
  border-radius: 0 2px 2px 0;
}

/* ── Layout ────────────────────────────────────────────────── */
.site-wrapper {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ───────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-subtle);
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform .3s ease;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* Sidebar Logo */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border-subtle);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 1;
}

.logo-mark svg {
  display: block;
}

.logo-text {
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
  line-height: 1.2;
}

.logo-text span {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-dim);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.logo-version {
  margin-left: auto;
  font-size: 10px;
  background: var(--bg-elevated);
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2px 8px;
  font-weight: 600;
  letter-spacing: .04em;
  flex-shrink: 0;
}

/* Sidebar Nav */
.sidebar-nav {
  padding: 12px 0;
  flex: 1;
}

.nav-home {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  color: var(--text-mid);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 500;
  border-radius: 0;
  transition: color .15s, background .15s;
  margin: 0 8px 4px;
  border-radius: var(--radius-sm);
}

.nav-home:hover { color: var(--text); background: var(--bg-elevated); }
.nav-home.active { color: var(--accent); background: rgba(97,131,247,.12); }

.nav-icon { font-size: 15px; width: 18px; text-align: center; }

.nav-group {
  margin: 8px 0;
}

.nav-group-label {
  display: block;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 8px 20px 4px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 7px 20px;
  margin: 0 8px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
  transition: color .15s, background .15s;
  position: relative;
}

.nav-link .nav-num {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-faint);
  min-width: 26px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: .02em;
}

.nav-link .nav-label { flex: 1; }

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

.nav-link.active {
  color: var(--accent);
  background: rgba(97,131,247,.12);
  font-weight: 500;
}

.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px; bottom: 4px;
  width: 3px;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
  margin-left: -8px;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-mid);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  font-weight: 500;
  transition: all .2s;
}

.theme-toggle:hover {
  background: var(--bg-highest);
  color: var(--text);
  border-color: var(--accent);
}

.theme-toggle .toggle-icon { font-size: 16px; }
.theme-toggle .toggle-label { flex: 1; text-align: left; }
.theme-toggle .toggle-indicator {
  width: 32px; height: 18px;
  background: var(--bg-highest);
  border-radius: 9px;
  border: 1px solid var(--border);
  position: relative;
  transition: background .2s;
}

.theme-toggle .toggle-indicator::after {
  content: '';
  position: absolute;
  width: 12px; height: 12px;
  background: var(--text-dim);
  border-radius: 50%;
  top: 2px; left: 2px;
  transition: left .2s, background .2s;
}

:root[data-theme="light"] .theme-toggle .toggle-indicator {
  background: var(--accent);
  border-color: var(--accent);
}

:root[data-theme="light"] .theme-toggle .toggle-indicator::after {
  left: 16px;
  background: white;
}

/* Mobile toggle button */
.sidebar-toggle {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  z-index: 200;
  box-shadow: var(--shadow-md);
}

/* ── Main Content ──────────────────────────────────────────── */
.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Page Hero ─────────────────────────────────────────────── */
.page-hero {
  position: relative;
  padding: 48px 56px 40px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(97,131,247,.07) 0%,
    transparent 60%);
  pointer-events: none;
}

.page-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    var(--accent), var(--accent-2), transparent);
}

.hero-number {
  font-size: 80px;
  font-weight: 800;
  line-height: 1;
  color: var(--bg-elevated);
  letter-spacing: -.03em;
  user-select: none;
  flex-shrink: 0;
  margin-top: 4px;
  font-family: 'Inter', sans-serif;
}

:root[data-theme="light"] .hero-number {
  color: var(--border-subtle);
}

.hero-content {
  flex: 1;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(97,131,247,.12);
  border: 1px solid rgba(97,131,247,.25);
  border-radius: 20px;
  padding: 3px 10px;
  margin-bottom: 12px;
}

.hero-content h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -.02em;
}

.hero-desc {
  font-size: 15px;
  color: var(--text-dim);
  max-width: 600px;
  line-height: 1.7;
}

.hero-meta {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-faint);
}

.hero-meta-item strong { color: var(--text-dim); }

/* ── Content Area ──────────────────────────────────────────── */
.content {
  max-width: 860px;
  padding: 44px 56px 80px;
  flex: 1;
}

/* Home page variant */
.content.content--wide {
  max-width: none;
  padding: 44px 56px 80px;
}

/* ── Typography ────────────────────────────────────────────── */
.content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin: 40px 0 16px;
  letter-spacing: -.02em;
  display: flex;
  align-items: center;
  gap: 12px;
}

.content h2::before {
  content: '';
  display: block;
  width: 4px;
  height: 22px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-radius: 2px;
  flex-shrink: 0;
}

.content h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin: 28px 0 12px;
  letter-spacing: -.01em;
}

.content h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-mid);
  margin: 20px 0 8px;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.content p {
  margin-bottom: 16px;
  color: var(--text-mid);
  font-size: 14.5px;
}

.content ul, .content ol {
  margin: 12px 0 20px 0;
  padding-left: 24px;
}

.content li {
  margin-bottom: 6px;
  color: var(--text-mid);
  font-size: 14.5px;
}

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

.content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(97,131,247,.3);
  transition: border-color .15s;
}

.content a:hover { border-bottom-color: var(--accent); }

hr.section-divider {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: 40px 0;
}

/* ── Tables ────────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

thead tr {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

thead th {
  padding: 11px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-dim);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border-subtle);
  transition: background .1s;
}

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

tbody tr:hover {
  background: var(--bg-elevated);
}

tbody tr:nth-child(even) {
  background: rgba(255,255,255,.015);
}

tbody tr:nth-child(even):hover {
  background: var(--bg-elevated);
}

:root[data-theme="light"] tbody tr:nth-child(even) {
  background: rgba(0,0,0,.018);
}

td {
  padding: 10px 16px;
  color: var(--text-mid);
  vertical-align: top;
}

td:first-child { color: var(--text); }

/* ── Code ──────────────────────────────────────────────────── */
code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 12.5px;
  background: var(--bg-elevated);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  white-space: nowrap;
}

.code-block {
  position: relative;
  margin: 20px 0;
  border-radius: var(--radius-lg);
  background: var(--code-bg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.code-lang {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-dim);
}

.code-dots {
  display: flex;
  gap: 5px;
  margin-right: auto;
}

.code-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.code-dots .dot-red   { background: #F95C5C; }
.code-dots .dot-amber { background: #F5C245; }
.code-dots .dot-green { background: #3DDA8A; }

.copy-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-faint);
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 3px 8px;
  cursor: pointer;
  font-family: inherit;
  transition: all .15s;
}

.copy-btn:hover {
  color: var(--text-mid);
  border-color: var(--border);
  background: var(--bg-highest);
}

.copy-btn.copied {
  color: var(--green);
  border-color: var(--green);
}

.code-block pre {
  padding: 20px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.code-block code {
  background: none;
  border: none;
  padding: 0;
  color: var(--code-text);
  font-size: 13px;
  line-height: 1.7;
  white-space: pre;
}

/* Syntax colors */
.s-comment { color: #5A6E90; font-style: italic; }
.s-keyword { color: #C792EA; }
.s-string  { color: #C3E88D; }
.s-number  { color: #F78C6C; }
.s-prop    { color: #82AAFF; }
.s-value   { color: #F5C245; }
.s-class   { color: #FFCB6B; }
.s-punct   { color: #89DDFF; }
.s-tier1   { color: var(--teal); }
.s-tier2   { color: var(--accent); }
.s-tier3   { color: var(--amber); }

/* ── Callouts ──────────────────────────────────────────────── */
.callout {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.65;
}

.callout-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }
.callout-body { flex: 1; }
.callout-body strong { display: block; margin-bottom: 4px; }

.callout--info {
  background: rgba(97,131,247,.1);
  border: 1px solid rgba(97,131,247,.25);
  color: var(--text-mid);
}
.callout--info .callout-icon { color: var(--accent); }
.callout--info strong { color: var(--accent); }

.callout--tip {
  background: rgba(61,218,138,.08);
  border: 1px solid rgba(61,218,138,.2);
  color: var(--text-mid);
}
.callout--tip .callout-icon { color: var(--green); }
.callout--tip strong { color: var(--green); }

.callout--rule {
  background: rgba(245,194,69,.08);
  border: 1px solid rgba(245,194,69,.2);
  color: var(--text-mid);
}
.callout--rule .callout-icon { color: var(--amber); }
.callout--rule strong { color: var(--amber); }

.callout--warning {
  background: rgba(249,92,92,.08);
  border: 1px solid rgba(249,92,92,.2);
  color: var(--text-mid);
}
.callout--warning .callout-icon { color: var(--red); }
.callout--warning strong { color: var(--red); }

.callout--key {
  background: rgba(155,114,250,.1);
  border: 1px solid rgba(155,114,250,.25);
  color: var(--text-mid);
}
.callout--key .callout-icon { color: var(--accent-2); }
.callout--key strong { color: var(--accent-2); }

/* ── Tier Badges ───────────────────────────────────────────── */
.tier-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .05em;
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

.tier-badge--1 {
  background: rgba(52,213,194,.12);
  color: var(--teal);
  border: 1px solid rgba(52,213,194,.25);
}

.tier-badge--2 {
  background: rgba(97,131,247,.12);
  color: var(--accent);
  border: 1px solid rgba(97,131,247,.25);
}

.tier-badge--3 {
  background: rgba(245,194,69,.12);
  color: var(--amber);
  border: 1px solid rgba(245,194,69,.25);
}

/* ── Token Chain ───────────────────────────────────────────── */
.chain {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 24px 0;
}

.chain-tier {
  display: flex;
  align-items: stretch;
  gap: 0;
  position: relative;
}

.chain-tier-label {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 8px 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  color: var(--text-faint);
  min-width: 24px;
}

.chain-tier--t1 .chain-tier-label { color: var(--teal); background: rgba(52,213,194,.08); border-color: rgba(52,213,194,.2); }
.chain-tier--t2 .chain-tier-label { color: var(--accent); background: rgba(97,131,247,.08); border-color: rgba(97,131,247,.2); }
.chain-tier--t3 .chain-tier-label { color: var(--amber); background: rgba(245,194,69,.08); border-color: rgba(245,194,69,.2); }
.chain-tier--css .chain-tier-label { color: var(--accent-2); background: rgba(155,114,250,.08); border-color: rgba(155,114,250,.2); }

.chain-content {
  flex: 1;
  padding: 14px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.chain-arrow {
  text-align: center;
  color: var(--text-faint);
  font-size: 18px;
  padding: 4px 0 4px 18px;
  line-height: 1;
}

.token-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
  font-size: 13px;
}

.token-row:last-child { margin-bottom: 0; }

.token-name {
  font-family: 'JetBrains Mono', monospace;
  color: var(--code-text);
  min-width: 180px;
}

.token-sep { color: var(--text-faint); }

.token-ref {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  background: rgba(97,131,247,.1);
  border: 1px solid rgba(97,131,247,.2);
  padding: 1px 8px;
  border-radius: var(--radius-sm);
}

.token-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--green);
}

.token-comment {
  font-size: 12px;
  color: var(--text-faint);
  font-style: italic;
}

/* ── Color Swatch ──────────────────────────────────────────── */
.swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.swatch-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-surface);
}

.swatch-color {
  height: 56px;
}

.swatch-info {
  padding: 10px 12px;
}

.swatch-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.swatch-value {
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-dim);
}

/* ── Role Cards ────────────────────────────────────────────── */
.role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.role-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  transition: border-color .2s, box-shadow .2s;
}

.role-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

.role-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.role-chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--code-text);
}

.role-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.role-card-desc {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ── Arch Diagram ──────────────────────────────────────────── */
.arch-diagram {
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.arch-tier {
  display: flex;
  align-items: stretch;
  gap: 12px;
  position: relative;
}

.arch-tier + .arch-tier {
  margin-top: 0;
}

.arch-connector {
  text-align: center;
  padding: 6px 0;
  color: var(--text-faint);
  font-size: 20px;
  position: relative;
}

.arch-connector::before {
  content: '';
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--border), transparent);
  transform: translateX(-50%);
  z-index: -1;
}

.arch-tier-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}

.arch-tier--t1 .arch-tier-num { background: rgba(52,213,194,.15); color: var(--teal); border: 1px solid rgba(52,213,194,.3); }
.arch-tier--t2 .arch-tier-num { background: rgba(97,131,247,.15); color: var(--accent); border: 1px solid rgba(97,131,247,.3); }
.arch-tier--t3 .arch-tier-num { background: rgba(245,194,69,.15); color: var(--amber); border: 1px solid rgba(245,194,69,.3); }

.arch-tier-body {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
  padding: 12px 0;
}

.arch-box {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-size: 12.5px;
}

.arch-box-name {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 3px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
}

.arch-box-modes {
  font-size: 11px;
  color: var(--text-faint);
}

.arch-tier--t1 .arch-box { border-color: rgba(52,213,194,.2); }
.arch-tier--t2 .arch-box { border-color: rgba(97,131,247,.2); }
.arch-tier--t3 .arch-box { border-color: rgba(245,194,69,.2); }

/* ── Stat Cards (Home) ─────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin: 28px 0;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 20px 22px;
  transition: transform .2s, box-shadow .2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 6px;
  letter-spacing: -.02em;
}

.stat-label {
  font-size: 12.5px;
  color: var(--text-dim);
  font-weight: 500;
}

/* ── Nav Cards (Home) ──────────────────────────────────────── */
.nav-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.nav-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 22px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color .2s, transform .2s, box-shadow .2s;
}

.nav-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  text-decoration: none;
}

.nav-card-icon {
  font-size: 24px;
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.nav-card-num {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-faint);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: .06em;
}

.nav-card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.nav-card-desc {
  font-size: 12.5px;
  color: var(--text-dim);
  line-height: 1.55;
}

/* ── Prev/Next Nav ─────────────────────────────────────────── */
.page-nav {
  display: flex;
  gap: 16px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

.page-nav-link {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 18px 22px;
  text-decoration: none;
  transition: border-color .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-nav-link:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
  text-decoration: none;
}

.page-nav-link--prev { text-align: left; }
.page-nav-link--next { text-align: right; }

.page-nav-direction {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 5px;
}

.page-nav-link--next .page-nav-direction { justify-content: flex-end; }

.page-nav-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

/* ── Section Intro ─────────────────────────────────────────── */
.section-intro {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 24px 28px;
  margin: 0 0 36px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.section-intro-icon {
  font-size: 28px;
  flex-shrink: 0;
}

/* ── Token Table special ───────────────────────────────────── */
.token-pill {
  display: inline-flex;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  background: rgba(97,131,247,.1);
  border: 1px solid rgba(97,131,247,.2);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.color-dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  margin-right: 6px;
  border: 1px solid rgba(255,255,255,.2);
  vertical-align: middle;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .main {
    margin-left: 0;
  }

  .sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .page-hero {
    padding: 28px 24px;
    gap: 16px;
  }

  .hero-number { font-size: 52px; }
  .hero-content h1 { font-size: 24px; }

  .content {
    padding: 28px 24px 60px;
  }

  .arch-tier-body {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero-number { display: none; }
  .page-nav { flex-direction: column; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .nav-cards { grid-template-columns: 1fr; }
}

/* ── Landing Hero ──────────────────────────────────────────── */
.landing-hero {
  padding: 72px 56px 60px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.landing-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 80% 50%, rgba(97,131,247,.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 30%, rgba(155,114,250,.06) 0%, transparent 70%);
  pointer-events: none;
}

.landing-hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.landing-hero-label::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.landing-hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.03em;
  margin-bottom: 20px;
  position: relative;
}

.landing-hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.landing-hero-desc {
  font-size: 16px;
  color: var(--text-dim);
  max-width: 560px;
  line-height: 1.75;
  margin-bottom: 32px;
}

.landing-hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── Hero Resource Links ───────────────────────────────────── */
.hero-resources {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 32px;
  max-width: 600px;
}

.hero-resource-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  text-decoration: none;
  transition: all .2s;
  position: relative;
  overflow: hidden;
}

.hero-resource-link::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity .2s;
}

.hero-resource-link:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hero-resource-link:hover::before { opacity: 1; }

/* Figma link */
.hero-resource-link--figma {
  background: rgba(97,131,247,.07);
  border-color: rgba(97,131,247,.3);
}

.hero-resource-link--figma::before {
  background: rgba(97,131,247,.06);
}

.hero-resource-link--figma:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(97,131,247,.25);
}

.hero-resource-link--figma .hero-resource-icon { color: var(--accent); }
.hero-resource-link--figma .hero-resource-title { color: var(--accent); }
.hero-resource-link--figma .hero-resource-arrow { color: var(--accent); }

/* Download link */
.hero-resource-link--download {
  background: rgba(52,213,194,.07);
  border-color: rgba(52,213,194,.3);
}

.hero-resource-link--download::before {
  background: rgba(52,213,194,.06);
}

.hero-resource-link--download:hover {
  border-color: var(--teal);
  box-shadow: 0 8px 32px rgba(52,213,194,.2);
}

.hero-resource-link--download .hero-resource-icon { color: var(--teal); }
.hero-resource-link--download .hero-resource-title { color: var(--teal); }
.hero-resource-link--download .hero-resource-arrow { color: var(--teal); }

.hero-resource-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.08);
}

.hero-resource-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.hero-resource-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.hero-resource-sub {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.4;
}

.hero-resource-arrow {
  flex-shrink: 0;
  font-size: 22px;
  font-weight: 300;
  opacity: .7;
  transition: transform .2s;
}

.hero-resource-link:hover .hero-resource-arrow {
  transform: translateX(3px) translateY(-3px);
}

.hero-resource-link--download:hover .hero-resource-arrow {
  transform: translateY(3px);
}

/* Light mode adjustments */
:root[data-theme="light"] .hero-resource-link--figma {
  background: rgba(97,131,247,.05);
}

:root[data-theme="light"] .hero-resource-link--download {
  background: rgba(52,213,194,.05);
}

:root[data-theme="light"] .hero-resource-icon {
  background: rgba(0,0,0,.04);
  border-color: rgba(0,0,0,.08);
}

:root[data-theme="light"] .hero-resource-sub {
  color: var(--text-dim);
}

@media (max-width: 600px) {
  .hero-resources { max-width: 100%; }
  .hero-resource-title { font-size: 14px; }
  .hero-resource-sub { display: none; }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  font-family: inherit;
  cursor: pointer;
  transition: all .2s;
  border: none;
}

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

.btn--primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 16px rgba(97,131,247,.4);
  transform: translateY(-1px);
  text-decoration: none;
  color: white;
}

.btn--outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(97,131,247,.08);
  text-decoration: none;
}

/* ── Section group titles ──────────────────────────────────── */
.group-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-faint);
  margin: 36px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.group-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-subtle);
}

/* ── Sidebar overlay for mobile ────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  z-index: 99;
}

.sidebar-overlay.open { display: block; }

/* ── Annotations  ──────────────────────────────────────────── */
.annotation {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text-faint);
  font-style: italic;
}

/* ── Figma link badge ──────────────────────────────────────── */
.figma-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--accent-2);
  background: rgba(155,114,250,.1);
  border: 1px solid rgba(155,114,250,.2);
  padding: 4px 12px;
  border-radius: 20px;
  text-decoration: none;
  font-weight: 500;
  transition: all .15s;
  margin: 8px 0;
}

.figma-link:hover {
  background: rgba(155,114,250,.2);
  border-color: var(--accent-2);
  text-decoration: none;
}

/* ── Chain Steps (10-token-chains.html) ────────────────────── */
.chain-step {
  display: flex;
  align-items: stretch;
  gap: 0;
}

.chain-step .chain-tier {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 8px 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  color: var(--text-faint);
  min-width: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: horizontal-tb;
  transform: none;
  font-size: 10px;
}

.chain-step .chain-tier--1 { color: var(--teal); background: rgba(52,213,194,.08); border-color: rgba(52,213,194,.25); }
.chain-step .chain-tier--2 { color: var(--accent); background: rgba(97,131,247,.08); border-color: rgba(97,131,247,.25); }
.chain-step .chain-tier--3 { color: var(--amber); background: rgba(245,194,69,.08); border-color: rgba(245,194,69,.25); }
.chain-step .chain-tier--css { color: var(--accent-2); background: rgba(155,114,250,.08); border-color: rgba(155,114,250,.25); }

.chain-body {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.chain-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.chain-token {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--code-text);
  margin-bottom: 4px;
}

.chain-note {
  font-size: 12px;
  color: var(--text-faint);
  font-style: italic;
}

.chain-arrow {
  text-align: center;
  color: var(--text-faint);
  font-size: 18px;
  padding: 4px 0 4px 20px;
  line-height: 1;
}

/* ── Steps List (12-designers, 13-developers) ───────────────── */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 20px 0;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color .15s;
}

.step-item:hover { border-color: rgba(97,131,247,.3); }

.step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(97,131,247,.15);
  border: 1px solid rgba(97,131,247,.3);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-body {
  flex: 1;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-mid);
}

.step-body strong {
  color: var(--text);
  display: block;
  margin-bottom: 4px;
}

/* ── FAQ List (14-faq.html) ────────────────────────────────── */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 8px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

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

.faq-q {
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  background: var(--bg-surface);
  position: relative;
}

.faq-q::before {
  content: 'Q';
  position: absolute;
  left: 24px;
  top: 19px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .05em;
  color: var(--accent);
  background: rgba(97,131,247,.12);
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 2px;
  text-align: center;
}

.faq-q {
  padding-left: 56px;
}

.faq-a {
  padding: 14px 24px 18px 56px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-mid);
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  position: relative;
}

.faq-a::before {
  content: 'A';
  position: absolute;
  left: 24px;
  top: 16px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .05em;
  color: var(--teal);
  background: rgba(52,213,194,.12);
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 2px;
  text-align: center;
}

:root[data-theme="light"] .faq-q { background: var(--bg-surface); }
:root[data-theme="light"] .faq-a { background: var(--bg-elevated); }

/* ── Site Footer ───────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 64px;
  padding: 40px 48px 48px;
  background: var(--bg-surface);
}

.footer-inner {
  max-width: 900px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-logo-mark {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  line-height: 1;
}

.footer-logo-mark svg {
  display: block;
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.footer-brand-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
}

.footer-tagline {
  font-size: 12px;
  color: var(--text-dim);
}

.footer-version {
  padding: 3px 9px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  background: rgba(97,131,247,.12);
  border: 1px solid rgba(97,131,247,.25);
  color: var(--accent);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  text-decoration: none;
  transition: all .2s;
  background: var(--bg-elevated);
  line-height: 1;
}

.footer-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(97,131,247,.08);
  text-decoration: none;
  transform: translateY(-1px);
}

.footer-link-icon {
  flex-shrink: 0;
  opacity: .6;
  transition: opacity .2s;
}

.footer-link:hover .footer-link-icon {
  opacity: 1;
}

.footer-copy {
  font-size: 12px;
  color: var(--text-faint);
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  margin: 0;
}

@media (max-width: 768px) {
  .site-footer {
    padding: 32px 20px 40px;
  }

  .footer-link span:not(.footer-link-icon) {
    display: inline;
  }
}