/* ─── DS TOOLBAR (below standard nav, uses --ds-nav-h set by JS) ─── */
  :root { --ds-nav-h: 80px; --ds-toolbar-h: 44px; --ds-offset: calc(var(--ds-nav-h) + var(--ds-toolbar-h)); }

  .ds-toolbar {
    position: fixed; top: var(--ds-nav-h); left: 0; right: 0; z-index: 150;
    display: flex; align-items: center; justify-content: flex-end;
    padding: 0 48px; height: var(--ds-toolbar-h); gap: 16px;
    background: rgba(245,245,245,0.96);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-rule);
  }
  [data-theme="dark"] .ds-toolbar { background: rgba(24,24,24,0.96); }

  .nav-customize {
    font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.1em; text-transform: lowercase;
    background: var(--color-ink); color: var(--color-bg);
    border: none; cursor: pointer; padding: 8px 20px;
    transition: background var(--dur-fast);
  }
  .nav-customize:hover { background: var(--color-accent); }

  /* ─── LAYOUT ───────────────────────────────────────────────────────── */
  .ds-layout { display: flex; padding-top: var(--ds-toolbar-h); min-height: 100vh; }

  /* ─── SIDEBAR ──────────────────────────────────────────────────────── */
  .ds-sidebar {
    position: fixed; top: var(--ds-offset); left: 0;
    width: 220px; height: calc(100vh - var(--ds-offset));
    overflow-y: auto; overflow-x: hidden;
    border-right: 1px solid var(--color-rule);
    background: var(--color-bg);
    padding: 32px 0 48px;
    z-index: 100;
  }
  .ds-sidebar::-webkit-scrollbar { width: 0; }
  .sb-group { margin-bottom: 28px; }
  .sb-group-label {
    font-family: var(--font-mono); font-size: var(--text-xs); font-weight: var(--fw-bold);
    letter-spacing: 0.14em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3);
    padding: 0 24px; margin-bottom: 8px;
  }
  .sb-link {
    display: block; padding: 6px 24px;
    font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.06em;
    color: var(--color-ink-3); text-transform: lowercase;
    transition: color var(--dur-fast);
    border-left: 2px solid transparent;
  }
  .sb-link:hover { color: var(--color-ink); }
  .sb-link.active { color: var(--color-accent); border-left-color: var(--color-accent); }

  /* ─── MAIN CONTENT ─────────────────────────────────────────────────── */
  .ds-main { margin-left: 220px; flex: 1; min-width: 0; }

  /* ─── SECTIONS ─────────────────────────────────────────────────────── */
  .ds-section { border-bottom: 1px solid var(--color-rule); padding: 64px 64px 64px 64px; }
  .ds-section:last-child { border-bottom: none; }
  .ds-section-label {
    font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.16em;
    text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); margin-bottom: 12px;
  }
  .ds-section-title {
    font-size: clamp(22px, 3vw, 36px); font-weight: var(--fw-bold); line-height: var(--lh-tight);
    letter-spacing: -0.02em; margin-bottom: 16px;
  }
  .ds-section-desc { font-size: var(--text-base); line-height: var(--lh-loose); color: var(--color-ink-2); max-width: 600px; margin-bottom: 48px; }

  /* ─── INTRO STATS ──────────────────────────────────────────────────── */
  .ds-stats { display: flex; gap: 48px; margin-top: 48px; }
  .ds-stat-value { font-size: clamp(32px, 4vw, 56px); font-weight: var(--fw-bold); line-height: 1; letter-spacing: -0.03em; }
  .ds-stat-label { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); margin-top: 6px; }

  /* ─── FOUNDATION: COLOR ────────────────────────────────────────────── */
  .token-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1px; background: var(--color-rule-solid); border: 1px solid var(--color-rule-solid); margin-bottom: 40px; }
  .token-swatch { background: var(--color-bg); padding: 16px; }
  .token-swatch-color { height: 48px; border-radius: var(--radius-sm); margin-bottom: 12px; }
  .token-swatch-name { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink); letter-spacing: 0.04em; margin-bottom: 4px; }
  .token-swatch-value { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.04em; margin-bottom: 4px; }
  .token-swatch-desc { font-size: var(--text-sm); color: var(--color-ink-3); line-height: 1.5; }
  .token-group-title { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: var(--fw-bold); letter-spacing: 0.14em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); margin: 32px 0 16px; }
  .token-group-title:first-child { margin-top: 0; }

  /* ─── FOUNDATION: TYPOGRAPHY ───────────────────────────────────────── */
  .type-scale { display: flex; flex-direction: column; gap: 1px; background: var(--color-rule-solid); border: 1px solid var(--color-rule-solid); margin-bottom: 40px; }
  .type-row { background: var(--color-bg); padding: 20px 24px; display: flex; align-items: baseline; gap: 32px; }
  .type-meta { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.08em; min-width: 160px; flex-shrink: 0; }
  .type-sample { color: var(--color-ink); }
  .font-families { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--color-rule-solid); border: 1px solid var(--color-rule-solid); margin-bottom: 40px; }
  .font-family-card { background: var(--color-bg); padding: 32px 24px; }
  .font-family-specimen { font-size: 48px; font-weight: var(--fw-bold); line-height: 1; margin-bottom: 16px; color: var(--color-ink); }
  .font-family-name { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); margin-bottom: 4px; }
  .font-family-stack { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); line-height: var(--lh-body); }
  .weights-row { display: flex; gap: 32px; flex-wrap: wrap; margin-bottom: 40px; }
  .weight-item { }
  .weight-sample { font-size: 24px; line-height: 1.2; color: var(--color-ink); margin-bottom: 6px; }
  .weight-label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.08em; }

  /* ─── FOUNDATION: SPACING ──────────────────────────────────────────── */
  .spacing-scale { display: flex; flex-direction: column; gap: 12px; margin-bottom: 40px; }
  .spacing-row { display: flex; align-items: center; gap: 20px; }
  .spacing-bar { height: 20px; background: var(--color-accent); opacity: 0.7; border-radius: 2px; flex-shrink: 0; }
  .spacing-meta { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); }

  /* ─── FOUNDATION: BORDER ───────────────────────────────────────────── */
  .radius-grid { display: flex; gap: 24px; flex-wrap: wrap; margin-bottom: 40px; }
  .radius-item { text-align: center; }
  .radius-box { width: 80px; height: 80px; background: var(--color-surface); border: 1px solid var(--color-rule-solid); margin-bottom: 10px; }
  .radius-label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.06em; }

  /* ─── FOUNDATION: SHADOW ───────────────────────────────────────────── */
  .shadow-grid { display: flex; gap: 32px; flex-wrap: wrap; margin-bottom: 40px; }
  .shadow-item { }
  .shadow-box { width: 120px; height: 80px; background: var(--color-surface); margin-bottom: 12px; border-radius: var(--radius-sm); }
  .shadow-label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.06em; }

  /* ─── FOUNDATION: MOTION ───────────────────────────────────────────── */
  .motion-table { width: 100%; border-collapse: collapse; margin-bottom: 40px; }
  .motion-table th, .motion-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--color-rule); font-size: var(--text-sm); }
  .motion-table th { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); font-weight: 400; }
  .motion-table code { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-accent); }
  .motion-demo { display: inline-block; width: 32px; height: 32px; background: var(--color-accent); border-radius: 50%; cursor: pointer; transition: transform var(--dur-base); }
  .motion-demo:hover { transform: scale(1.4); }

  /* ─── COMPONENT DOC ────────────────────────────────────────────────── */
  .comp-section { border-bottom: 1px solid var(--color-rule); padding: 56px 64px; }
  .comp-header { display: flex; align-items: baseline; gap: 16px; margin-bottom: 10px; }
  .comp-title { font-size: 24px; font-weight: var(--fw-bold); letter-spacing: -0.01em; }
  .comp-tag { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-3); background: rgba(0,0,0,0.05); padding: 2px 10px; border-radius: var(--radius-sm); }
  .comp-tier { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-accent); margin-bottom: 12px; }
  .comp-desc { font-size: var(--text-base); line-height: 1.8; color: var(--color-ink-2); max-width: 620px; margin-bottom: 32px; }

  /* Preview area */
  .comp-preview {
    border: 1px solid var(--color-rule-solid);
    background: var(--color-surface);
    padding: 32px;
    margin-bottom: 24px;
    min-height: 80px;
    display: flex; flex-wrap: wrap; align-items: flex-start; gap: 16px;
  }
  .comp-preview.col { flex-direction: column; align-items: flex-start; }
  .comp-preview.dark { background: #1a1a1a; }

  /* Attributes table */
  .doc-table { width: 100%; border-collapse: collapse; margin-bottom: 24px; font-size: var(--text-sm); }
  .doc-table th { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); font-weight: 400; padding: 8px 16px; text-align: left; border-bottom: 1px solid var(--color-rule-solid); }
  .doc-table td { padding: 10px 16px; border-bottom: 1px solid var(--color-rule); color: var(--color-ink-2); vertical-align: top; }
  .doc-table td:first-child { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-accent); }
  .doc-table td code { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-ink-3); }
  .doc-table tr:last-child td { border-bottom: none; }

  /* Token controls */
  .token-controls { background: rgba(0,0,0,0.025); border: 1px solid var(--color-rule); padding: 20px 24px; margin-bottom: 24px; }
  .tc-title { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); margin-bottom: 16px; }
  .tc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
  .tc-item label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.06em; display: block; margin-bottom: 6px; }
  .tc-item input[type="color"] { width: 36px; height: 28px; border: 1px solid var(--color-rule-solid); background: none; cursor: pointer; padding: 2px; }
  .tc-item input[type="range"] { width: 100%; accent-color: var(--color-accent); }
  .tc-item select { font-family: var(--font-mono); font-size: var(--text-xs); border: 1px solid var(--color-rule-solid); background: var(--color-bg); padding: 4px 8px; color: var(--color-ink); width: 100%; }
  .tc-value { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); display: inline-block; min-width: 40px; margin-left: 8px; }

  /* Code snippet */
  .doc-code { position: relative; background: #1a1a1a; border-radius: var(--radius-sm); overflow: hidden; margin-bottom: 24px; }
  .doc-code pre { padding: 20px 24px; overflow-x: auto; font-family: var(--font-mono); font-size: 12px; line-height: 1.7; color: #e0e0e0; }
  .doc-code-copy {
    position: absolute; top: 12px; right: 12px;
    font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.1em;
    background: rgba(255,255,255,0.1); color: #aaa; border: 1px solid rgba(255,255,255,0.15);
    padding: 4px 10px; cursor: pointer; text-transform: lowercase;
    transition: background var(--dur-fast);
  }
  .doc-code-copy:hover { background: rgba(255,255,255,0.2); color: #fff; }
  .doc-code-copy.copied { color: #4ade80; border-color: #4ade80; }

  /* ─── TOKEN EDITOR PANEL ───────────────────────────────────────────── */
  .te-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.25);
    z-index: 150; opacity: 0; pointer-events: none;
    transition: opacity var(--dur-base);
  }
  .te-overlay.open { opacity: 1; pointer-events: all; }
  .te-panel {
    position: fixed; top: var(--ds-offset); right: 0; bottom: 0;
    width: 340px; background: var(--color-bg);
    border-left: 1px solid var(--color-rule-solid);
    z-index: 160; overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--dur-base) var(--ease-out);
  }
  .te-panel.open { transform: translateX(0); }
  .te-panel::-webkit-scrollbar { width: 4px; }
  .te-panel::-webkit-scrollbar-thumb { background: var(--color-rule-solid); }
  .te-header { padding: 24px 24px 16px; border-bottom: 1px solid var(--color-rule); display: flex; align-items: center; justify-content: space-between; }
  .te-header-title { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.1em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink); }
  .te-close { background: none; border: none; cursor: pointer; color: var(--color-ink-3); font-size: 18px; line-height: 1; padding: 4px; }
  .te-close:hover { color: var(--color-ink); }
  .te-body { padding: 24px; }
  .te-group { margin-bottom: 32px; }
  .te-group-title { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: var(--fw-bold); letter-spacing: 0.14em; text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--color-rule); }
  .te-control { margin-bottom: 14px; }
  .te-control label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-3); letter-spacing: 0.06em; display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
  .te-control label span { color: var(--color-ink); }
  .te-control input[type="color"] { width: 44px; height: 32px; border: 1px solid var(--color-rule-solid); background: none; cursor: pointer; padding: 2px 4px; flex-shrink: 0; }
  .color-pair { display: flex; gap: 8px; align-items: center; }
  .hex-input { flex: 1; font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.06em; border: 1px solid var(--color-rule-solid); background: var(--color-bg); padding: 0 10px; height: 32px; color: var(--color-ink); width: 100%; transition: border-color var(--dur-fast); }
  .hex-input:focus { outline: none; border-color: var(--color-ink); }
  .hex-input.invalid { border-color: var(--color-danger); color: var(--color-danger); }
  .te-control input[type="range"] { width: 100%; accent-color: var(--color-accent); }
  .te-control select { font-family: var(--font-mono); font-size: var(--text-xs); border: 1px solid var(--color-rule-solid); background: var(--color-bg); padding: 6px 10px; color: var(--color-ink); width: 100%; }
  .te-footer { padding: 16px 24px; border-top: 1px solid var(--color-rule); display: flex; gap: 12px; }
  .te-btn {
    flex: 1; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em;
    text-transform: lowercase; border: 1px solid var(--color-rule-solid);
    background: transparent; color: var(--color-ink-2); padding: 10px;
    cursor: pointer; transition: all var(--dur-fast);
  }
  .te-btn:hover { border-color: var(--color-ink); color: var(--color-ink); }
  .te-btn.primary { background: var(--color-ink); color: var(--color-bg); border-color: var(--color-ink); }
  .te-btn.primary:hover { background: var(--color-accent); border-color: var(--color-accent); }

  /* ─── DARK MODE (tokens come from tokens.css, only DS-specific overrides here) ── */
  [data-theme="dark"] nav { background: rgba(24,24,24,0.96); }
  [data-theme="dark"] .ds-sidebar { background: var(--color-bg); }
  [data-theme="dark"] .comp-preview { background: #1e1e1e; }
  [data-theme="dark"] .doc-code { background: #0e0e0e; }
  [data-theme="dark"] .doc-table th { border-bottom-color: #505050; }
  [data-theme="dark"] .te-panel,
  [data-theme="dark"] .nav-profile-dropdown { background: #242424; border-color: #505050; }

  /* ─── DARK TOGGLE ───────────────────────────────────────────────────── */
  .nav-dark-toggle {
    width: 32px; height: 32px; border: 1px solid var(--color-rule-solid);
    background: transparent; cursor: pointer; display: flex; align-items: center;
    justify-content: center; transition: all var(--dur-fast); flex-shrink: 0;
    color: var(--color-ink-3);
  }
  .nav-dark-toggle:hover { border-color: var(--color-ink); color: var(--color-ink); }
  .nav-dark-toggle svg { width: 14px; height: 14px; fill: currentColor; }

  /* ─── PROFILE SWITCHER ──────────────────────────────────────────────── */
  .nav-profile { position: relative; }
  .nav-profile-btn {
    font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.08em;
    color: var(--color-ink-2); background: transparent; border: 1px solid var(--color-rule-solid);
    padding: 6px 12px; cursor: pointer; display: flex; align-items: center; gap: 6px;
    transition: all var(--dur-fast); white-space: nowrap;
  }
  .nav-profile-btn:hover { border-color: var(--color-ink); color: var(--color-ink); }
  .nav-profile-btn .chevron { font-size: 8px; transition: transform var(--dur-fast); }
  .nav-profile.open .nav-profile-btn .chevron { transform: rotate(180deg); }
  .nav-profile-dropdown {
    position: absolute; top: calc(100% + 6px); right: 0;
    min-width: 220px; background: var(--color-surface);
    border: 1px solid var(--color-rule-solid);
    box-shadow: var(--shadow-md); z-index: 200;
    display: none; flex-direction: column;
  }
  .nav-profile.open .nav-profile-dropdown { display: flex; }
  .nav-profile-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 14px; cursor: pointer;
    font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.06em;
    color: var(--color-ink-2); transition: all var(--dur-fast); gap: 8px;
    border-bottom: 1px solid var(--color-rule);
  }
  .nav-profile-item:last-child { border-bottom: none; }
  .nav-profile-item:hover { background: var(--color-bg); color: var(--color-ink); }
  .nav-profile-item.active { color: var(--color-accent); }
  .nav-profile-item .profile-name { flex: 1; }
  .nav-profile-delete {
    background: none; border: none; cursor: pointer; color: var(--color-ink-3);
    font-size: var(--text-base); line-height: 1; padding: 0 0 0 4px;
    transition: color var(--dur-fast);
  }
  .nav-profile-delete:hover { color: var(--color-danger); }
  .nav-profile-sep { height: 1px; background: var(--color-rule-solid); margin: 4px 0; }
  .nav-profile-action {
    padding: 10px 14px; cursor: pointer;
    font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.08em;
    color: var(--color-ink-3); text-transform: lowercase;
    transition: color var(--dur-fast); display: flex; align-items: center; gap: 8px;
    border-bottom: 1px solid var(--color-rule);
  }
  .nav-profile-action:last-child { border-bottom: none; }
  .nav-profile-action:hover { color: var(--color-accent); }

  /* ─── UTILITY ──────────────────────────────────────────────────────── */
  .divider-row { height: 1px; background: var(--color-rule-solid); margin: 40px 0; }
  .mono { font-family: var(--font-mono); }
  .accent { color: var(--color-accent); }
  .ink-3 { color: var(--color-ink-3); }

  /* Section header row for component groups */
  .comp-group-header {
    padding: 24px 64px 16px;
    border-bottom: 1px solid var(--color-rule);
    background: rgba(0,0,0,0.015);
  }
  .comp-group-label {
    font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.16em;
    text-transform: var(--text-xs-transform, uppercase); color: var(--color-ink-3);
    display: flex; align-items: center; gap: 12px;
  }
  .comp-group-label::before { content: ''; display: block; width: 20px; height: 1px; background: var(--color-accent); }