/* ============================================================
       ROOVIX DESIGN SYSTEM — TOKENS & COMPONENTS
       ============================================================ */

    /* ---------- Design Tokens (CSS Variables) ---------- */
    :root {
      /* Canvas */
      --color-canvas-default: #000000;
      --color-canvas-inset: #050505;
      --color-canvas-subtle: #0a0a0a;
      --color-canvas-overlay: #111111;
      --color-canvas-elevated: #161616;

      /* Foreground */
      --color-fg-default: #ffffff;
      --color-fg-muted: #a1a1aa;
      --color-fg-subtle: #6b6b76;
      --color-fg-on-emphasis: #ffffff;

      /* Semantic */
      --color-accent-fg: #3b82f6;
      --color-accent-emphasis: #2563eb;
      --color-accent-muted: rgba(59, 130, 246, 0.20);
      --color-accent-subtle: rgba(59, 130, 246, 0.08);
      --color-accent-hover: #60a5fa;

      --color-success-fg: #22c55e;
      --color-success-emphasis: #16a34a;
      --color-success-muted: rgba(34, 197, 94, 0.20);
      --color-success-subtle: rgba(34, 197, 94, 0.08);
      --color-success-hover: #4ade80;

      --color-warning-fg: #eab308;
      --color-warning-emphasis: #ca8a04;
      --color-warning-muted: rgba(234, 179, 8, 0.20);
      --color-warning-subtle: rgba(234, 179, 8, 0.08);
      --color-warning-hover: #facc15;

      --color-danger-fg: #ef4444;
      --color-danger-emphasis: #dc2626;
      --color-danger-muted: rgba(239, 68, 68, 0.20);
      --color-danger-subtle: rgba(239, 68, 68, 0.08);
      --color-danger-hover: #f87171;

      --color-info-fg: #8b5cf6;
      --color-info-emphasis: #7c3aed;
      --color-info-muted: rgba(139, 92, 246, 0.20);
      --color-info-subtle: rgba(139, 92, 246, 0.08);
      --color-info-hover: #a78bfa;

      --color-done-fg: #a1a1aa;
      --color-done-emphasis: #71717a;
      --color-done-muted: rgba(161, 161, 170, 0.20);
      --color-done-subtle: rgba(161, 161, 170, 0.08);
      --color-done-hover: #d4d4d8;

      /* Borders */
      --color-border-subtle: rgba(255, 255, 255, 0.05);
      --color-border-subtle-hover: rgba(255, 255, 255, 0.09);
      --color-border-muted: rgba(255, 255, 255, 0.10);
      --color-border-default: rgba(255, 255, 255, 0.15);
      --color-border-default-hover: rgba(255, 255, 255, 0.22);
      --color-border-hard: rgba(255, 255, 255, 0.30);
      --color-border-hard-hover: rgba(255, 255, 255, 0.45);

      --color-border-accent: var(--color-accent-fg);
      --color-border-accent-muted: var(--color-accent-muted);
      --color-border-success: var(--color-success-fg);
      --color-border-success-muted: var(--color-success-muted);
      --color-border-danger: var(--color-danger-fg);
      --color-border-danger-muted: var(--color-danger-muted);
      --color-border-warning: var(--color-warning-fg);
      --color-border-warning-muted: var(--color-warning-muted);

      /* Shadows */
      --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.60);
      --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.70);
      --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.80);
      --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.85);
      --shadow-xl: 0 16px 56px rgba(0, 0, 0, 0.92);

      /* Radius */
      --radius-1: 4px;
      --radius-2: 8px;
      --radius-3: 12px;
      --radius-4: 16px;
      --radius-full: 9999px;

      /* Typography */
      --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", Helvetica, Arial, sans-serif;
      --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

      /* Motion */
      --transition-fast: 0.10s ease;
      --transition-base: 0.18s ease;
      --transition-slow: 0.30s ease;
      --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

      /* Spacing */
      --space-1: 4px;
      --space-2: 8px;
      --space-3: 12px;
      --space-4: 16px;
      --space-5: 24px;
      --space-6: 32px;
      --space-7: 48px;
      --space-8: 64px;
      --space-9: 96px;

      /* Layout */
      --sidebar-width: 260px;
      --header-height: 60px;
    }

    /* ---------- Light Theme ---------- */
    [data-theme="light"] {
      --color-canvas-default: #ffffff;
      --color-canvas-inset: #f8f8fa;
      --color-canvas-subtle: #f1f1f3;
      --color-canvas-overlay: #f8f8fa;
      --color-canvas-elevated: #ffffff;

      --color-fg-default: #0b0b0e;
      --color-fg-muted: #52525b;
      --color-fg-subtle: #71717a;
      --color-fg-on-emphasis: #ffffff;

      --color-accent-fg: #2563eb;
      --color-accent-emphasis: #1d4ed8;
      --color-accent-muted: rgba(37, 99, 235, 0.14);
      --color-accent-subtle: rgba(37, 99, 235, 0.05);
      --color-accent-hover: #3b82f6;

      --color-success-fg: #16a34a;
      --color-success-emphasis: #15803d;
      --color-success-muted: rgba(22, 163, 74, 0.14);
      --color-success-subtle: rgba(22, 163, 74, 0.05);
      --color-success-hover: #22c55e;

      --color-warning-fg: #ca8a04;
      --color-warning-emphasis: #a16207;
      --color-warning-muted: rgba(202, 138, 4, 0.14);
      --color-warning-subtle: rgba(202, 138, 4, 0.05);
      --color-warning-hover: #eab308;

      --color-danger-fg: #dc2626;
      --color-danger-emphasis: #b91c1c;
      --color-danger-muted: rgba(220, 38, 38, 0.14);
      --color-danger-subtle: rgba(220, 38, 38, 0.05);
      --color-danger-hover: #ef4444;

      --color-info-fg: #7c3aed;
      --color-info-emphasis: #6d28d9;
      --color-info-muted: rgba(124, 58, 237, 0.14);
      --color-info-subtle: rgba(124, 58, 237, 0.05);
      --color-info-hover: #8b5cf6;

      --color-done-fg: #52525b;
      --color-done-emphasis: #3f3f46;
      --color-done-muted: rgba(82, 82, 91, 0.14);
      --color-done-subtle: rgba(82, 82, 91, 0.05);
      --color-done-hover: #71717a;

      --color-border-subtle: rgba(0, 0, 0, 0.05);
      --color-border-subtle-hover: rgba(0, 0, 0, 0.09);
      --color-border-muted: rgba(0, 0, 0, 0.10);
      --color-border-default: rgba(0, 0, 0, 0.15);
      --color-border-default-hover: rgba(0, 0, 0, 0.22);
      --color-border-hard: rgba(0, 0, 0, 0.30);
      --color-border-hard-hover: rgba(0, 0, 0, 0.45);

      --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
      --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
      --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.10);
      --shadow-xl: 0 16px 56px rgba(0, 0, 0, 0.12);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background: var(--color-canvas-default);
      color: var(--color-fg-default);
      font-family: var(--font-sans);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      min-height: 100vh;
      transition: background var(--transition-base), color var(--transition-base);
      display: flex;
      flex-direction: column;
    }

    /* ---------- Scrollbar ---------- */
    ::-webkit-scrollbar {
      width: 5px;
      height: 5px;
    }
    ::-webkit-scrollbar-track {
      background: transparent;
    }
    ::-webkit-scrollbar-thumb {
      background: var(--color-border-muted);
      border-radius: 9999px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: var(--color-border-default);
    }

    /* ---------- Focus ---------- */
    :focus-visible {
      outline: 2px solid var(--color-accent-fg);
      outline-offset: 2px;
    }

    /* ---------- Reduced Motion ---------- */
    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
      html {
        scroll-behavior: auto;
      }
    }

    /* ---------- Utility Classes ---------- */
    .bg-canvas-default {
      background: var(--color-canvas-default);
    }
    .bg-canvas-inset {
      background: var(--color-canvas-inset);
    }
    .bg-canvas-subtle {
      background: var(--color-canvas-subtle);
    }
    .bg-canvas-overlay {
      background: var(--color-canvas-overlay);
    }
    .bg-canvas-elevated {
      background: var(--color-canvas-elevated);
    }

    .text-fg-default {
      color: var(--color-fg-default);
    }
    .text-fg-muted {
      color: var(--color-fg-muted);
    }
    .text-fg-subtle {
      color: var(--color-fg-subtle);
    }
    .text-fg-on-emphasis {
      color: var(--color-fg-on-emphasis);
    }

    .text-accent {
      color: var(--color-accent-fg);
    }
    .text-success {
      color: var(--color-success-fg);
    }
    .text-warning {
      color: var(--color-warning-fg);
    }
    .text-danger {
      color: var(--color-danger-fg);
    }
    .text-info {
      color: var(--color-info-fg);
    }
    .text-done {
      color: var(--color-done-fg);
    }

    .border-subtle {
      border-color: var(--color-border-subtle);
    }
    .border-muted {
      border-color: var(--color-border-muted);
    }
    .border-default {
      border-color: var(--color-border-default);
    }
    .border-hard {
      border-color: var(--color-border-hard);
    }
    .border-accent {
      border-color: var(--color-border-accent);
    }
    .border-success {
      border-color: var(--color-border-success);
    }
    .border-danger {
      border-color: var(--color-border-danger);
    }
    .border-warning {
      border-color: var(--color-border-warning);
    }

    .shadow-xs {
      box-shadow: var(--shadow-xs);
    }
    .shadow-sm {
      box-shadow: var(--shadow-sm);
    }
    .shadow-md {
      box-shadow: var(--shadow-md);
    }
    .shadow-lg {
      box-shadow: var(--shadow-lg);
    }
    .shadow-xl {
      box-shadow: var(--shadow-xl);
    }

    /* ---------- Layout ---------- */
    .app {
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    /* ---------- Header ---------- */
    .app-header {
      position: sticky;
      top: 0;
      z-index: 100;
      height: var(--header-height);
      background: var(--color-canvas-default);
      border-bottom: 1px solid var(--color-border-subtle);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      display: flex;
      align-items: center;
      padding: 0 var(--space-4) 0 var(--space-5);
      gap: var(--space-4);
      flex-shrink: 0;
    }

    .app-header .brand {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      font-weight: 600;
      font-size: 1.05rem;
      letter-spacing: -0.02em;
      white-space: nowrap;
      text-decoration: none;
      color: var(--color-fg-default);
      flex-shrink: 0;
    }

    .app-header .brand svg {
      flex-shrink: 0;
    }

    .app-header .brand .badge {
      font-size: 0.6rem;
      font-weight: 500;
      background: var(--color-accent-subtle);
      color: var(--color-accent-fg);
      padding: 0.1rem 0.45rem;
      border-radius: var(--radius-full);
      border: 1px solid var(--color-accent-muted);
      letter-spacing: 0.02em;
    }

    .app-header .search-wrap {
      flex: 1;
      max-width: 420px;
      margin: 0 var(--space-4);
      position: relative;
    }

    .app-header .search-wrap input {
      width: 100%;
      padding: 0.4rem 0.75rem 0.4rem 2.2rem;
      background: var(--color-canvas-inset);
      border: 1px solid var(--color-border-muted);
      border-radius: var(--radius-2);
      color: var(--color-fg-default);
      font-size: 0.825rem;
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    }

    .app-header .search-wrap input:focus {
      outline: none;
      border-color: var(--color-fg-muted);
      box-shadow: 0 0 0 3px var(--color-accent-subtle);
    }

    .app-header .search-wrap input::placeholder {
      color: var(--color-fg-subtle);
    }

    .app-header .search-wrap .search-icon {
      position: absolute;
      left: 0.7rem;
      top: 50%;
      transform: translateY(-50%);
      color: var(--color-fg-subtle);
      pointer-events: none;
    }

    .app-header .search-wrap .search-results {
      position: absolute;
      top: calc(100% + 4px);
      left: 0;
      right: 0;
      background: var(--color-canvas-elevated);
      border: 1px solid var(--color-border-default);
      border-radius: var(--radius-2);
      box-shadow: var(--shadow-lg);
      max-height: 300px;
      overflow-y: auto;
      display: none;
      z-index: 200;
      padding: var(--space-1) 0;
    }

    .app-header .search-wrap .search-results.active {
      display: block;
    }

    .app-header .search-wrap .search-results .result-item {
      padding: 0.4rem 0.8rem;
      font-size: 0.85rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: var(--space-2);
      transition: background var(--transition-fast);
      color: var(--color-fg-default);
      text-decoration: none;
      border: none;
      background: none;
      width: 100%;
      text-align: left;
      font-family: var(--font-sans);
    }

    .app-header .search-wrap .search-results .result-item:hover,
    .app-header .search-wrap .search-results .result-item.highlighted {
      background: var(--color-canvas-subtle);
    }

    .app-header .search-wrap .search-results .result-item .category {
      font-size: 0.6rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--color-fg-subtle);
      background: var(--color-canvas-inset);
      padding: 0.05rem 0.4rem;
      border-radius: var(--radius-full);
      border: 1px solid var(--color-border-subtle);
    }

    .app-header .search-wrap .search-results .no-results {
      padding: 0.8rem;
      text-align: center;
      color: var(--color-fg-muted);
      font-size: 0.85rem;
    }

    .app-header .actions {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      flex-shrink: 0;
    }

    .theme-toggle {
      width: 36px;
      height: 36px;
      position: absolute;
      right: var(--space-4);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-2);
      border: 1px solid var(--color-border-muted);
      background: var(--color-canvas-elevated);
      color: var(--color-fg-muted);
      cursor: pointer;
      transition: all var(--transition-fast);
      flex-shrink: 0;
    }

    .theme-toggle:hover {
      color: var(--color-fg-default);
      border-color: var(--color-border-default);
    }

    .menu-toggle {
      display: none;
      width: 36px;
      height: 36px;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-2);
      border: 1px solid var(--color-border-muted);
      background: transparent;
      color: var(--color-fg-muted);
      cursor: pointer;
      transition: all var(--transition-fast);
      flex-shrink: 0;
    }

    .menu-toggle:hover {
      color: var(--color-fg-default);
      border-color: var(--color-border-default);
    }

    /* ---------- Sidebar ---------- */
    .app-body {
      display: flex;
      flex: 1;
      overflow: hidden;
      position: relative;
    }

    .sidebar-backdrop {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.5);
      z-index: 40;
      backdrop-filter: blur(4px);
      transition: opacity var(--transition-base);
    }

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

    .sidebar {
      width: var(--sidebar-width);
      flex-shrink: 0;
      background: var(--color-canvas-inset);
      border-right: 1px solid var(--color-border-subtle);
      overflow-y: auto;
      padding: var(--space-4) var(--space-3) var(--space-8);
      height: calc(100vh - var(--header-height));
      position: fixed;
      top: var(--header-height);
      transition: transform var(--transition-slow) var(--ease-out-expo);
      z-index: 50;
    }

    .sidebar .nav-section {
      margin-bottom: var(--space-5);
    }

    .sidebar .nav-section-title {
      font-size: 0.65rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--color-fg-subtle);
      padding: 0 var(--space-2);
      margin-bottom: var(--space-2);
    }

    .sidebar .nav-item {
      display: block;
      padding: 0.3rem 0.75rem;
      border-radius: var(--radius-1);
      font-size: 0.825rem;
      color: var(--color-fg-muted);
      text-decoration: none;
      transition: all var(--transition-slow);
      cursor: pointer;
      border: none;
      background: none;
      width: 100%;
      text-align: left;
      font-family: var(--font-sans);
    }

    .sidebar .nav-item:hover {
      color: var(--color-fg-default);
      background: var(--color-canvas-subtle);
    }

    .sidebar .nav-item.active {
      color: var(--color-fg-default);
      background: var(--color-accent-subtle);
      border-left: 2px solid var(--color-accent-fg);
      padding-left: calc(0.75rem - 2px);
    }

    .sidebar .nav-item .count {
      float: right;
      font-size: 0.6rem;
      color: var(--color-fg-subtle);
      background: var(--color-canvas-subtle);
      padding: 0.05rem 0.45rem;
      border-radius: var(--radius-full);
    }

    /* ---------- Main Content ---------- */
    .main-content {
      flex: 1;
      min-width: 0;
      padding: var(--space-6) var(--space-6) var(--space-9);
      overflow-y: auto;
      max-width: 100%;
      margin-left: var(--sidebar-width);
    }

    .main-content .page-title {
      font-size: 1.75rem;
      font-weight: 700;
      letter-spacing: -0.03em;
      margin-bottom: var(--space-1);
    }

    .main-content .page-desc {
      color: var(--color-fg-muted);
      font-size: 1rem;
      margin-bottom: var(--space-6);
      max-width: 600px;
    }

    /* ---------- Component Demo Blocks ---------- */
    .demo-block {
      border: 1px solid var(--color-border-subtle);
      border-radius: var(--radius-3);
      overflow: visible;
      margin-bottom: var(--space-6);
      background: var(--color-canvas-default);
    }
    .demo-block .demo-body {
      overflow: visible;
      position: relative;
      z-index: 1;
    }
    .demo-block .demo-code {
      overflow: hidden;
      position: relative;
      z-index: 0;
    }

    .demo-block .demo-head {
      padding: var(--space-3) var(--space-4);
      background: var(--color-canvas-subtle);
      border-bottom: 1px solid var(--color-border-subtle);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: var(--space-2);
    }

    .demo-block .demo-head .label {
      font-weight: 500;
      font-size: 0.85rem;
      display: flex;
      align-items: center;
      gap: var(--space-2);
    }

    .demo-block .demo-head .label .tag {
      font-size: 0.6rem;
      font-weight: 400;
      color: var(--color-fg-subtle);
      background: var(--color-canvas-inset);
      padding: 0.05rem 0.5rem;
      border-radius: var(--radius-full);
      border: 1px solid var(--color-border-muted);
    }

    .demo-block .demo-body {
      padding: var(--space-5);
      background: var(--color-canvas-default);
      display: flex;
      flex-wrap: wrap;
      gap: var(--space-4);
      align-items: flex-start;
    }

    .demo-block .demo-body.column {
      flex-direction: column;
    }

    .demo-block .demo-body.centered {
      justify-content: center;
      align-items: center;
    }

    .demo-block .demo-body .demo-row {
      display: flex;
      flex-wrap: wrap;
      gap: var(--space-3);
      align-items: center;
      width: 100%;
    }

    .demo-block .demo-code {
      border-top: 1px solid var(--color-border-subtle);
      background: var(--color-canvas-inset);
      position: relative;
    }

    .demo-block .demo-code pre {
      margin: 0;
      padding: var(--space-4) var(--space-5);
      overflow-x: auto;
      font-size: 0.8rem;
      line-height: 1.6;
    }

    .demo-block .demo-code .copy-btn {
      position: absolute;
      top: var(--space-2);
      right: var(--space-2);
      background: var(--color-canvas-elevated);
      border: 1px solid var(--color-border-muted);
      color: var(--color-fg-muted);
      font-size: 0.7rem;
      padding: 0.2rem 0.65rem;
      border-radius: var(--radius-1);
      cursor: pointer;
      transition: all var(--transition-fast);
      font-family: var(--font-sans);
      z-index: 5;
    }

    .demo-block .demo-code .copy-btn:hover {
      color: var(--color-fg-default);
      border-color: var(--color-border-default);
    }

    .demo-block .demo-code .copy-btn.copied {
      color: var(--color-success-fg);
      border-color: var(--color-success-fg);
    }

    /* ---------- Component Primitives ---------- */

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.4rem;
      padding: 0.5rem 1.2rem;
      font-size: 0.85rem;
      font-weight: 500;
      border-radius: var(--radius-2);
      transition: all var(--transition-fast);
      cursor: pointer;
      border: 1px solid transparent;
      font-family: var(--font-sans);
      line-height: 1.4;
      text-decoration: none;
      white-space: nowrap;
      user-select: none;
      transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    }

    .btn:disabled {
      opacity: 0.4;
      pointer-events: none;
    }

    .btn-primary {
      background: var(--color-fg-default);
      color: var(--color-fg-subtle);
    }
    .btn-primary:hover {
      background: var(--color-fg-muted);
    }

    .btn-secondary {
      background: var(--color-canvas-elevated);
      color: var(--color-fg-default);
      border-color: var(--color-border-default);
    }
    .btn-secondary:hover {
      background: var(--color-canvas-overlay);
      border-color: var(--color-border-default-hover);
    }

    .btn-ghost {
      background: transparent;
      color: var(--color-fg-muted);
    }
    .btn-ghost:hover {
      background: var(--color-canvas-subtle);
      color: var(--color-fg-default);
    }

    .btn-outline {
      background: transparent;
      color: var(--color-accent-fg);
      border-color: var(--color-border-accent);
    }
    .btn-outline:hover {
      background: var(--color-accent-subtle);
    }

    .btn-success {
      background: var(--color-success-emphasis);
      color: var(--color-fg-on-emphasis);
    }
    .btn-success:hover {
      background: var(--color-success-hover);
    }

    .btn-danger {
      background: var(--color-danger-emphasis);
      color: var(--color-fg-on-emphasis);
    }
    .btn-danger:hover {
      background: var(--color-danger-hover);
    }

    .btn-warning {
      background: var(--color-warning-emphasis);
      color: var(--color-fg-on-emphasis);
    }
    .btn-warning:hover {
      background: var(--color-warning-hover);
    }

    .btn-sm {
      padding: 0.3rem 0.7rem;
      font-size: 0.75rem;
    }
    .btn-lg {
      padding: 0.7rem 1.5rem;
      font-size: 1rem;
    }
    .btn-icon {
      width: 36px;
      height: 36px;
      padding: 0;
      border-radius: var(--radius-2);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-icon.btn-sm {
      width: 28px;
      height: 28px;
    }
    .btn-icon.btn-lg {
      width: 44px;
      height: 44px;
    }

    .btn-group {
      display: inline-flex;
      gap: 0;
      border-radius: var(--radius-2);
      overflow: hidden;
      border: 1px solid var(--color-border-default);
    }
    .btn-group .btn {
      min-width: 90px;
      border-radius: 0;
      border: none;
      border-right: 1px solid var(--color-border-subtle);
    }
    .btn-group .btn:last-child {
      border-right: none;
    }
    .btn-group .btn:not(:first-child) {
      border-left: 1px solid var(--color-border-subtle);
    }

    /* Badges */
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
      padding: 0.15rem 0.6rem;
      font-size: 0.7rem;
      font-weight: 500;
      border-radius: var(--radius-full);
      border: 1px solid transparent;
      line-height: 1.4;
    }
    .badge-accent {
      background: var(--color-accent-subtle);
      color: var(--color-accent-fg);
      border-color: var(--color-accent-muted);
    }
    .badge-success {
      background: var(--color-success-subtle);
      color: var(--color-success-fg);
      border-color: var(--color-success-muted);
    }
    .badge-warning {
      background: var(--color-warning-subtle);
      color: var(--color-warning-fg);
      border-color: var(--color-warning-muted);
    }
    .badge-danger {
      background: var(--color-danger-subtle);
      color: var(--color-danger-fg);
      border-color: var(--color-danger-muted);
    }
    .badge-info {
      background: var(--color-info-subtle);
      color: var(--color-info-fg);
      border-color: var(--color-info-muted);
    }
    .badge-done {
      background: var(--color-done-subtle);
      color: var(--color-done-fg);
      border-color: var(--color-done-muted);
    }

    /* Cards */
    .card {
      background: var(--color-canvas-subtle);
      border: 1px solid var(--color-border-muted);
      border-radius: var(--radius-3);
      padding: var(--space-4);
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    }
    .card:hover {
      border-color: var(--color-border-subtle);
      box-shadow: var(--shadow-md);
    }

    .card-stat {
      display: flex;
      flex-direction: column;
      gap: var(--space-1);
      min-width: 120px;
      flex: 1;
    }
    .card-stat .stat-value {
      font-size: 1.75rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    .card-stat .stat-label {
      font-size: 0.8rem;
      color: var(--color-fg-muted);
    }
    .card-stat .stat-change {
      font-size: 0.75rem;
      font-weight: 500;
    }
    .card-stat .stat-change.positive {
      color: var(--color-success-fg);
    }
    .card-stat .stat-change.negative {
      color: var(--color-danger-fg);
    }

    /* Inputs */
    .input {
      width: 100%;
      padding: 0.5rem 0.8rem;
      background: var(--color-canvas-inset);
      border: 1px solid var(--color-border-muted);
      border-radius: var(--radius-2);
      color: var(--color-fg-default);
      font-size: 0.85rem;
      font-family: var(--font-sans);
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    }
    .input:focus {
      outline: none;
      border-color: var(--color-fg-muted);
      box-shadow: 0 0 0 3px var(--color-accent-subtle);
    }
    .input::placeholder {
      color: var(--color-fg-subtle);
    }
    .input:disabled {
      opacity: 0.5;
      pointer-events: none;
    }
    .input.error {
      border-color: var(--color-danger-fg);
    }
    .input.error:focus {
      box-shadow: 0 0 0 3px var(--color-danger-subtle);
    }
    .input.success {
      border-color: var(--color-success-fg);
    }
    .input.success:focus {
      box-shadow: 0 0 0 3px var(--color-success-subtle);
    }

    .input-group {
      display: flex;
      align-items: stretch;
      gap: 0;
      border-radius: var(--radius-2);
      overflow: hidden;
      border: 1px solid var(--color-border-muted);
      background: var(--color-canvas-inset);
    }
    .input-group .input {
      border: none;
      border-radius: 0;
      flex: 1;
      background: transparent;
    }
    .input-group .input:focus {
      box-shadow: none;
    }
    .input-group .input-group-addon {
      display: flex;
      align-items: center;
      padding: 0 0.8rem;
      font-size: 0.8rem;
      color: var(--color-fg-muted);
      background: var(--color-canvas-subtle);
      border-right: 1px solid var(--color-border-muted);
      white-space: nowrap;
    }
    .input-group .input-group-addon:last-child {
      border-right: none;
      border-left: 1px solid var(--color-border-muted);
    }
    .textarea {
      min-height: 80px;
    }

    /* Checkbox / Radio / Switch */
    .control {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      cursor: pointer;
      font-size: 0.85rem;
      user-select: none;
    }
    .control input[type="checkbox"],
    .control input[type="radio"] {
      width: 16px;
      height: 16px;
      accent-color: var(--color-accent-fg);
      cursor: pointer;
      flex-shrink: 0;
    }

    .switch {
      position: relative;
      width: 40px;
      height: 22px;
      flex-shrink: 0;
      cursor: pointer;
    }
    .switch input {
      opacity: 0;
      width: 0;
      height: 0;
      position: absolute;
    }
    .switch .slider {
      position: absolute;
      inset: 0;
      background: var(--color-border-muted);
      border-radius: var(--radius-full);
      transition: background var(--transition-fast);
    }
    .switch .slider::before {
      content: "";
      position: absolute;
      width: 16px;
      height: 16px;
      left: 3px;
      bottom: 3px;
      background: var(--color-fg-subtle);
      border-radius: 50%;
      transition: transform var(--transition-fast);
    }
    .switch input:checked+.slider {
      background: var(--color-fg-default);
    }
    .switch input:checked+.slider::before {
      transform: translateX(18px);
    }
    .switch input:focus-visible+.slider {
      outline: 2px solid var(--color-fg-muted);
      outline-offset: 2px;
    }

    /* Range */
    .range {
      width: 100%;
      height: 4px;
      -webkit-appearance: none;
      appearance: none;
      background: var(--color-border-muted);
      border-radius: var(--radius-full);
      outline: none;
      transition: background var(--transition-fast);
    }
    .range::-webkit-slider-thumb {
      -webkit-appearance: none;
      appearance: none;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--color-accent-emphasis);
      cursor: pointer;
      border: 2px solid var(--color-canvas-default);
      transition: transform var(--transition-fast);
    }
    .range::-webkit-slider-thumb:hover {
      transform: scale(1.15);
    }
    .range::-moz-range-thumb {
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--color-accent-emphasis);
      cursor: pointer;
      border: 2px solid var(--color-canvas-default);
    }


    /* ========================================
      CUSTOM SELECT
      ======================================== */
    .custom-select {
      position: relative;
      width: 100%;
      font-family: var(--font-sans);
    }

    /* Trigger */
    .select-trigger {
      width: 100%;
      min-height: 38px;

      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;

      padding: 0.5rem 0.8rem;

      background: var(--color-canvas-inset);
      color: var(--color-fg-default);

      border: 1px solid var(--color-border-default);
      border-radius: 8px;

      font: inherit;
      font-size: 0.85rem;
      font-weight: 500;
      text-align: left;

      cursor: pointer;

      transition:
        background-color 120ms ease,
        border-color 120ms ease,
        box-shadow 120ms ease;
    }

    /* Trigger hover */
    .select-trigger:hover {
      background: var(--color-canvas-subtle);
      border-color: var(--color-border-default-hover);
    }

    /* Trigger focus */
    .select-trigger:focus-visible {
      outline: none;

      border-color: var(--color-accent-emphasis);

      box-shadow:
        0 0 0 1px var(--color-accent-emphasis),
        0 0 0 4px var(--color-accent-subtle);
    }

    /* Arrow */
    .select-arrow {
      width: 7px;
      height: 7px;

      flex-shrink: 0;

      border-right: 1.5px solid var(--color-fg-muted);
      border-bottom: 1.5px solid var(--color-fg-muted);

      transform: rotate(45deg) translateY(-2px);

      transition:
        transform 150ms ease,
        border-color 120ms ease;
    }

    .custom-select.open .select-arrow {
      transform: rotate(225deg) translateY(-2px);
    }

    .custom-select:hover .select-arrow {
      border-color: var(--color-fg-default);
    }


    /* ========================================
      DROPDOWN MENU
      ======================================== */

    .select-menu {
      position: absolute;
      z-index: 300;

      top: calc(100% + 6px);
      left: 0;
      right: 0;

      padding: 5px;

      background: var(--color-canvas-subtle);

      border: 1px solid var(--color-border-default);
      border-radius: 9px;

      opacity: 0;
      visibility: hidden;
      transform: translateY(-4px) scale(0.98);

      transform-origin: top;

      transition:
        opacity 120ms ease,
        transform 120ms ease,
        visibility 120ms ease;
    }

    .custom-select.open .select-menu {
      opacity: 1;
      visibility: visible;
      transform: translateY(0) scale(1);
    }


    /* ========================================
      OPTIONS
      ======================================== */

    .select-option {
      padding: 8px 10px;

      border-radius: 6px;

      color: var(--color-fg-subtle);

      font-size: 0.85rem;
      font-weight: 500;

      cursor: pointer;

      transition:
        background-color 100ms ease,
        color 100ms ease;
    }

    /* REAL HOVER */
    .select-option:hover {
      background: var(--color-canvas-elevated);
      color: var(--color-fg-default);
    }

    /* Selected */
    .select-option.selected {
      background: var(--color-canvas-elevated);
      color: var(--color-fg-default);
    }

    /* Selected + hover */
    .select-option.selected:hover {
      background: var(--color-canvas-elevated);
      color: var(--color-fg-default);
    }


    /* ========================================
      DISABLED
      ======================================== */

    .custom-select.disabled {
      opacity: 0.55;
    }

    .select-trigger:disabled {
      cursor: not-allowed;
    }

    .custom-select.disabled .select-trigger:hover {
      background: var(--color-canvas-inset);
      border-color: var(--color-border-default);
    }


    /* ========================================
      OPTIONAL DIVIDER
      ======================================== */

    .select-option + .select-option {
      margin-top: 2px;
    }


    /* Tabs */
    .tabs {
      display: flex;
      gap: 0;
      border-bottom: 1px solid var(--color-border-subtle);
      overflow-x: auto;
      flex-wrap: nowrap;
    }
    .tabs .tab {
      padding: 0.5rem 1rem;
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--color-fg-muted);
      border: none;
      background: none;
      cursor: pointer;
      border-bottom: 2px solid transparent;
      transition: all var(--transition-fast);
      font-family: var(--font-sans);
      white-space: nowrap;
    }
    .tabs .tab:hover {
      color: var(--color-fg-default);
    }
    .tabs .tab.active {
      color: var(--color-fg-default);
      border-bottom-color: var(--color-fg-default);
    }
    .tabs .tab:focus-visible {
      outline-offset: -2px;
    }

    /* Avatar */
    .avatar {
      width: 40px;
      height: 40px;
      border-radius: var(--radius-full);
      background: var(--color-canvas-subtle);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--color-fg-muted);
      flex-shrink: 0;
      border: 1px solid var(--color-border-subtle);
      overflow: hidden;
    }
    .avatar-sm {
      width: 28px;
      height: 28px;
      font-size: 0.65rem;
    }
    .avatar-lg {
      width: 56px;
      height: 56px;
      font-size: 1.2rem;
    }
    .avatar-group {
      display: flex;
    }
    .avatar-group .avatar {
      margin-right: -20px;
      border: 2px solid var(--color-canvas-default);
    }
    .avatar-group .avatar:last-child {
      margin-right: 0;
    }

    /* Tag */
    .tag {
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
      padding: 0.1rem 0.55rem;
      font-size: 0.7rem;
      font-weight: 500;
      border-radius: var(--radius-1);
      background: var(--color-canvas-subtle);
      color: var(--color-fg-muted);
      border: 1px solid var(--color-border-subtle);
      line-height: 1.6;
    }
    .tag-accent {
      background: var(--color-accent-subtle);
      color: var(--color-accent-fg);
      border-color: var(--color-accent-muted);
    }
    .tag-success {
      background: var(--color-success-subtle);
      color: var(--color-success-fg);
      border-color: var(--color-success-muted);
    }
    .tag-danger {
      background: var(--color-danger-subtle);
      color: var(--color-danger-fg);
      border-color: var(--color-danger-muted);
    }

    /* Skeleton */
    .skeleton {
      background: var(--color-canvas-subtle);
      border-radius: var(--radius-1);
      animation: skeleton-pulse 1.6s ease-in-out infinite;
      display: inline-block;
      line-height: 1;
      min-height: 0.8em;
    }
    .skeleton-text {
      height: 0.8em;
      margin-bottom: 0.3em;
    }
    .skeleton-text:last-child {
      margin-bottom: 0;
    }
    .skeleton-card {
      padding: var(--space-4);
      border-radius: var(--radius-3);
      background: var(--color-canvas-subtle);
      border: 1px solid var(--color-border-subtle);
      min-height: 120px;
    }
    .skeleton-avatar {
      width: 40px;
      height: 40px;
      border-radius: var(--radius-full);
      background: var(--color-canvas-subtle);
      animation: skeleton-pulse 1.6s ease-in-out infinite;
      flex-shrink: 0;
    }

    @keyframes skeleton-pulse {
      0%,
      100% {
        opacity: 0.6;
      }
      50% {
        opacity: 1;
      }
    }

    /* Spinner */
    .spinner {
      display: inline-block;
      width: 24px;
      height: 24px;
      border: 2.5px solid var(--color-border-muted);
      border-top-color: var(--color-fg-default);
      border-radius: 50%;
      animation: spin 0.7s linear infinite;
    }
    .spinner-button {
      display: inline-block;
      width: 24px;
      height: 24px;
      margin-left: 5px;
      border: 2.5px solid var(--color-border-muted);
      border-top-color: var(--color-fg-subtle);
      border-radius: 50%;
      animation: spin 0.7s linear infinite;
    }
    .spinner-sm {
      width: 16px;
      height: 16px;
      border-width: 2px;
    }
    .spinner-lg {
      width: 40px;
      height: 40px;
      border-width: 3px;
    }


    @keyframes spin {
      to {
        transform: rotate(360deg);
      }
    }

    .spinner-dots {
      display: inline-flex;
      gap: 4px;
    }
    .spinner-dots span {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--color-fg-default);
      animation: dot-bounce 1.2s ease-in-out infinite;
    }
    .spinner-dots span:nth-child(2) {
      animation-delay: 0.2s;
    }
    .spinner-dots span:nth-child(3) {
      animation-delay: 0.4s;
    }

    @keyframes dot-bounce {
      0%,
      80%,
      100% {
        transform: scale(0.4);
        opacity: 0.4;
      }
      40% {
        transform: scale(1);
        opacity: 1;
      }
    }

    /* Progress */
    .progress {
      width: 100%;
      height: 6px;
      background: var(--color-canvas-subtle);
      border-radius: var(--radius-full);
      overflow: hidden;
      position: relative;
    }
    .progress .bar {
      height: 100%;
      border-radius: var(--radius-full);
      background: var(--color-fg-default);
      transition: width 0.4s ease;
    }
    .progress .bar.success {
      background: var(--color-success-emphasis);
    }
    .progress .bar.danger {
      background: var(--color-danger-emphasis);
    }
    .progress .bar.warning {
      background: var(--color-warning-emphasis);
    }
    .progress.indeterminate .bar {
      width: 40%;
      animation: progress-indeterminate 1.2s ease-in-out infinite;
    }

    @keyframes progress-indeterminate {
      0% {
        transform: translateX(-100%);
      }
      100% {
        transform: translateX(250%);
      }
    }

    /* Toast / Alert */
    .toast {
      padding: var(--space-3) var(--space-4);
      border-radius: var(--radius-3);
      border: 1px solid var(--color-border-subtle);
      background: var(--color-canvas-elevated);
      box-shadow: var(--shadow-lg);
      max-width: 380px;
      display: flex;
      align-items: flex-start;
      gap: var(--space-3);
      animation: toast-in 0.3s ease-out;
    }
    .toast .toast-icon {
      flex-shrink: 0;
      margin-top: 1px;
    }
    .toast .toast-content {
      flex: 1;
    }
    .toast .toast-title {
      font-weight: 600;
      font-size: 0.85rem;
    }
    .toast .toast-desc {
      font-size: 0.8rem;
      color: var(--color-fg-muted);
    }
    .toast-accent {
      border-color: var(--color-accent-muted);
    }
    .toast-success {
      border-color: var(--color-success-muted);
    }
    .toast-danger {
      border-color: var(--color-danger-muted);
    }
    .toast-warning {
      border-color: var(--color-warning-muted);
    }

    @keyframes toast-in {
      from {
        opacity: 0;
        transform: translateY(-12px) scale(0.96);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    /* Alert inline */
    .alert {
      padding: var(--space-3) var(--space-4);
      border-radius: var(--radius-2);
      border: 1px solid var(--color-border-muted);
      background: var(--color-canvas-inset);
      display: flex;
      align-items: flex-start;
      gap: var(--space-3);
      font-size: 0.85rem;
    }
    .alert .alert-icon {
      flex-shrink: 0;
      margin-top: 1px;
    }
    .alert-accent {
      border-color: var(--color-accent-muted);
      background: var(--color-accent-subtle);
    }
    .alert-success {
      border-color: var(--color-success-muted);
      background: var(--color-success-subtle);
    }
    .alert-danger {
      border-color: var(--color-danger-muted);
      background: var(--color-danger-subtle);
    }
    .alert-warning {
      border-color: var(--color-warning-muted);
      background: var(--color-warning-subtle);
    }

    /* File upload zone */
    .drop-zone {
      border: 2px dashed var(--color-border-muted);
      border-radius: var(--radius-3);
      padding: var(--space-6) var(--space-4);
      text-align: center;
      background: var(--color-canvas-inset);
      transition: border-color var(--transition-fast), background var(--transition-fast);
      cursor: pointer;
      width: 100%;
    }
    .drop-zone:hover,
    .drop-zone.dragover {
      border-color: var(--color-accent-fg);
      background: var(--color-accent-subtle);
    }
    .drop-zone .dz-icon {
      font-size: 2rem;
      color: var(--color-fg-subtle);
      margin-bottom: var(--space-2);
    }
    .drop-zone .dz-text {
      font-size: 0.9rem;
      color: var(--color-fg-muted);
    }
    .drop-zone .dz-hint {
      font-size: 0.75rem;
      color: var(--color-fg-subtle);
      margin-top: var(--space-1);
    }

    /* File item — always 100% of parent; name truncates, never expands width */
    .file-item {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: var(--space-2) var(--space-3);
      border-radius: var(--radius-2);
      background: var(--color-canvas-inset);
      border: 1px solid var(--color-border-subtle);
      width: 100%;
      max-width: 100%;
      box-sizing: border-box;
      min-width: 0;
    }
    .file-item .file-icon {
      flex-shrink: 0;
      color: var(--color-fg-subtle);
    }
    .file-item .file-info {
      flex: 1 1 0%;
      min-width: 0;
      overflow: hidden;
    }
    .file-item .file-name {
      font-size: 0.85rem;
      font-weight: 500;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      max-width: 100%;
      display: block;
    }
    .file-item .file-size {
      font-size: 0.7rem;
      color: var(--color-fg-subtle);
    }
    .file-item .file-status {
      font-size: 0.7rem;
      font-weight: 500;
      flex-shrink: 0;
    }
    .file-item .file-status.success {
      color: var(--color-success-fg);
    }
    .file-item .file-status.error {
      color: var(--color-danger-fg);
    }
    .file-item .file-status.uploading {
      color: var(--color-accent-fg);
    }

    /* Table */
    .table-wrap {
      overflow-x: auto;
      width: 100%;
      border-radius: var(--radius-2);
      border: 1px solid var(--color-border-subtle);
    }
    .table-wrap table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.85rem;
    }
    .table-wrap th,
    .table-wrap td {
      padding: 0.6rem 0.8rem;
      text-align: left;
      border-bottom: 1px solid var(--color-border-subtle);
    }
    .table-wrap th {
      font-weight: 600;
      color: var(--color-fg-muted);
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      background: var(--color-canvas-subtle);
    }
    .table-wrap tr:last-child td {
      border-bottom: none;
    }

    /* Breadcrumbs */
    .breadcrumbs {
      display: flex;
      align-items: center;
      gap: var(--space-1);
      font-size: 0.85rem;
      color: var(--color-fg-muted);
      flex-wrap: wrap;
    }
    .breadcrumbs a {
      color: var(--color-fg-muted);
      text-decoration: none;
      transition: color var(--transition-fast);
    }
    .breadcrumbs a:hover {
      color: var(--color-fg-default);
    }
    .breadcrumbs .sep {
      color: var(--color-fg-subtle);
      user-select: none;
    }
    .breadcrumbs .current {
      color: var(--color-fg-default);
      font-weight: 500;
    }

    /* Pagination */
    .pagination {
      display: flex;
      gap: var(--space-1);
      align-items: center;
      flex-wrap: wrap;
    }
    .pagination .page {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 32px;
      height: 32px;
      padding: 0 0.5rem;
      border-radius: var(--radius-1);
      border: 1px solid transparent;
      font-size: 0.85rem;
      color: var(--color-fg-muted);
      background: transparent;
      cursor: pointer;
      transition: all var(--transition-fast);
      font-family: var(--font-sans);
    }
    .pagination .page:hover {
      background: var(--color-canvas-subtle);
      color: var(--color-fg-default);
    }
    .pagination .page.active {
      background: var(--color-accent-subtle);
      color: var(--color-accent-fg);
      border-color: var(--color-accent-muted);
    }
    .pagination .page:disabled {
      opacity: 0.3;
      pointer-events: none;
    }

    /* Modal */
    .modal-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.7);
      backdrop-filter: blur(8px);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 200;
      padding: var(--space-4);
      animation: fade-in 0.2s ease-out;
    }
    .modal {
      background: var(--color-canvas-default);
      border: 1px solid var(--color-border-subtle);
      border-radius: var(--radius-4);
      padding: var(--space-6);
      max-width: 520px;
      width: 100%;
      max-height: 90vh;
      overflow-y: auto;
      box-shadow: var(--shadow-xl);
      animation: slide-up 0.25s ease-out;
    }
    .modal .modal-close {
      float: right;
      background: none;
      border: none;
      color: var(--color-fg-muted);
      font-size: 1.25rem;
      cursor: pointer;
      padding: 0 var(--space-1);
      line-height: 1;
      transition: color var(--transition-fast);
    }
    .modal .modal-close:hover {
      color: var(--color-fg-default);
    }
    .modal .modal-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: var(--space-2);
    }
    .modal .modal-body {
      color: var(--color-fg-muted);
      margin-bottom: var(--space-4);
    }
    .modal .modal-footer {
      display: flex;
      gap: var(--space-2);
      justify-content: flex-end;
      padding-top: var(--space-3);
      border-top: 1px solid var(--color-border-subtle);
    }

    @keyframes fade-in {
      from {
        opacity: 0;
      }
      to {
        opacity: 1;
      }
    }
    @keyframes slide-up {
      from {
        opacity: 0;
        transform: translateY(20px) scale(0.97);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    /* Tooltip */
    .tooltip-trigger {
      position: relative;
      display: inline-block;
    }
    .tooltip-trigger .tooltip {
      position: absolute;
      bottom: calc(100% + 6px);
      left: 50%;
      transform: translateX(-50%);
      background: var(--color-canvas-elevated);
      color: var(--color-fg-default);
      padding: 0.3rem 0.7rem;
      border-radius: var(--radius-1);
      font-size: 0.75rem;
      white-space: nowrap;
      border: 1px solid var(--color-border-muted);
      box-shadow: var(--shadow-sm);
      opacity: 0;
      pointer-events: none;
      transition: opacity var(--transition-fast);
      font-weight: 400;
    }
    .tooltip-trigger:hover .tooltip {
      opacity: 1;
    }

    /* Dropdown */
    .dropdown {
      position: relative;
      display: inline-block;
    }
    .dropdown .dropdown-menu {
      position: absolute;
      top: calc(100% + 4px);
      left: 0;
      min-width: 180px;
      background: var(--color-canvas-elevated);
      border: 1px solid var(--color-border-default);
      border-radius: var(--radius-2);
      box-shadow: var(--shadow-lg);
      padding: var(--space-1) 0;
      display: none;
      z-index: 300;
      opacity: 0;
      transform: translateY(-4px);
      transition: opacity var(--transition-fast), transform var(--transition-fast);
    }
    .dropdown .dropdown-menu.open {
      display: block;
      opacity: 1;
      transform: translateY(0);
    }
    .dropdown .dropdown-menu .dropdown-item {
      display: block;
      padding: 0.3rem 0.8rem;
      font-size: 0.85rem;
      color: var(--color-fg-default);
      text-decoration: none;
      cursor: pointer;
      transition: background var(--transition-fast);
      border: none;
      background: none;
      width: 100%;
      text-align: left;
      font-family: var(--font-sans);
    }
    .dropdown .dropdown-menu .dropdown-item:hover {
      background: var(--color-canvas-subtle);
    }
    .dropdown .dropdown-menu .dropdown-divider {
      height: 1px;
      margin: var(--space-1) 0;
      background: var(--color-border-subtle);
    }
    .dropdown .dropdown-menu .dropdown-header {
      padding: 0.3rem 0.8rem;
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--color-fg-subtle);
      font-weight: 600;
    }

    /* Drawer */
    .drawer-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.5);
      backdrop-filter: blur(4px);
      z-index: 150;
      display: none;
      opacity: 0;
      transition: opacity var(--transition-base);
    }
    .drawer-overlay.open {
      display: block;
      opacity: 1;
    }
    .drawer {
      position: fixed;
      top: 0;
      bottom: 0;
      width: 320px;
      max-width: 80vw;
      background: var(--color-canvas-default);
      border-right: 1px solid var(--color-border-subtle);
      box-shadow: var(--shadow-xl);
      z-index: 160;
      padding: var(--space-5);
      overflow-y: auto;
      transition: transform var(--transition-slow) var(--ease-out-expo);
    }
    .drawer.left {
      left: 0;
      transform: translateX(-100%);
    }
    .drawer.left.open {
      transform: translateX(0);
    }
    .drawer.right {
      right: 0;
      transform: translateX(100%);
    }
    .drawer.right.open {
      transform: translateX(0);
    }
    .drawer .drawer-close {
      float: right;
      background: none;
      border: none;
      color: var(--color-fg-muted);
      font-size: 1.25rem;
      cursor: pointer;
      padding: 0 var(--space-1);
      line-height: 1;
      transition: color var(--transition-fast);
    }
    .drawer .drawer-close:hover {
      color: var(--color-fg-default);
    }
    .drawer .drawer-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: var(--space-3);
    }

    /* TOC */
    .toc {
      display: flex;
      flex-direction: column;
      gap: var(--space-1);
      padding: var(--space-3) var(--space-4);
      border-radius: var(--radius-2);
      background: var(--color-canvas-inset);
      border: 1px solid var(--color-border-subtle);
      margin-bottom: var(--space-5);
    }
    .toc .toc-title {
      font-weight: 600;
      font-size: 0.8rem;
      color: var(--color-fg-muted);
      margin-bottom: var(--space-1);
    }
    .toc a {
      font-size: 0.85rem;
      color: var(--color-fg-muted);
      text-decoration: none;
      padding: 0.15rem 0;
      transition: color var(--transition-fast);
      display: flex;
      align-items: center;
      gap: var(--space-2);
    }
    .toc a:hover {
      color: var(--color-fg-default);
    }
    .toc a .toc-indent {
      display: inline-block;
      width: 0.8rem;
      flex-shrink: 0;
    }

    /* ---------- Responsive ---------- */
    @media (max-width: 1024px) {
      .app-header .search-wrap {
        max-width: 280px;
      }
    }

    @media (max-width: 820px) {
      .sidebar-backdrop.open {
        display: block;
      }
      .main-content {
        margin-left: 0;
      }

      .sidebar {
        position: fixed;
        top: var(--header-height);
        left: 0;
        bottom: 0;
        transform: translateX(-100%);
        width: 280px;
        z-index: 50;
        border-right: 1px solid var(--color-border-default);
        background: var(--color-canvas-default);
        height: calc(100vh - var(--header-height));
        box-shadow: var(--shadow-xl);
      }
      .sidebar.open {
        transform: translateX(0);
      }
      .menu-toggle {
        display: flex;
      }
      .app-header .search-wrap {
        max-width: 180px;
        margin: 0 var(--space-2);
      }
      .main-content {
        padding: var(--space-4);
      }
      .app-header .search-wrap .search-results {
        position: fixed;
        top: var(--header-height);
        left: var(--space-2);
        right: var(--space-2);
        max-height: 60vh;
        border-radius: var(--radius-3);
      }
    }

    @media (max-width: 640px) {
      .app-header {
        padding: 0 var(--space-3);
        gap: var(--space-2);
      }
      .app-header .brand .badge {
        display: none;
      }
      .app-header .search-wrap {
        max-width: 120px;
      }
      .app-header .search-wrap input {
        padding: 0.3rem 0.5rem 0.3rem 1.8rem;
        font-size: 0.75rem;
      }
      .app-header .search-wrap .search-icon {
        left: 0.5rem;
      }
      .main-content .page-title {
        font-size: 1.4rem;
      }
      .demo-block .demo-body {
        padding: var(--space-3);
      }
      .demo-block .demo-code pre {
        font-size: 0.7rem;
        padding: var(--space-3);
      }
      .card-stat .stat-value {
        font-size: 1.4rem;
      }
      .modal {
        padding: var(--space-4);
        margin: var(--space-2);
      }
      .tabs .tab {
        padding: 0.4rem 0.7rem;
        font-size: 0.78rem;
      }
      .drawer {
        width: 280px;
      }
    }

    @media (max-width: 400px) {
      .app-header .search-wrap {
        max-width: 80px;
      }
      .app-header .search-wrap input {
        font-size: 0.7rem;
        padding: 0.2rem 0.3rem 0.2rem 1.6rem;
      }
      .app-header .search-wrap .search-icon {
        left: 0.3rem;
      }
      .btn {
        font-size: 0.75rem;
        padding: 0.35rem 0.8rem;
      }
      .btn-icon {
        width: 30px;
        height: 30px;
      }
    }

    /* ---------- Prism overrides ---------- */
    .demo-code pre[class*="language-"] {
      background: transparent !important;
      margin: 0 !important;
      padding: var(--space-4) var(--space-5) !important;
    }
    .demo-code code[class*="language-"] {
      font-family: var(--font-mono) !important;
      font-size: 0.8rem !important;
      line-height: 1.6 !important;
    }

    /* ---------- Misc utilities ---------- */
    .flex-center {
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .gap-1 {
      gap: var(--space-1);
    }
    .gap-2 {
      gap: var(--space-2);
    }
    .gap-3 {
      gap: var(--space-3);
    }
    .gap-4 {
      gap: var(--space-4);
    }
    .gap-5 {
      gap: var(--space-5);
    }
    .flex-wrap {
      flex-wrap: wrap;
    }
    .w-full {
      width: 100%;
    }
    .max-w-sm {
      max-width: 320px;
    }
    .max-w-md {
      max-width: 420px;
    }
    .max-w-lg {
      max-width: 520px;
    }
    .mt-1 {
      margin-top: var(--space-1);
    }
    .mt-2 {
      margin-top: var(--space-2);
    }
    .mt-3 {
      margin-top: var(--space-3);
    }
    .mt-4 {
      margin-top: var(--space-4);
    }
    .mt-5 {
      margin-top: var(--space-5);
    }
    .mb-1 {
      margin-bottom: var(--space-1);
    }
    .mb-2 {
      margin-bottom: var(--space-2);
    }
    .mb-3 {
      margin-bottom: var(--space-3);
    }
    .mb-4 {
      margin-bottom: var(--space-4);
    }
    .mb-5 {
      margin-bottom: var(--space-5);
    }
    .text-sm {
      font-size: 0.825rem;
    }
    .text-xs {
      font-size: 0.7rem;
    }
    .text-muted {
      color: var(--color-fg-muted);
    }
    .text-subtle {
      color: var(--color-fg-subtle);
    }
    .font-mono {
      font-family: var(--font-mono);
    }
    .font-semibold {
      font-weight: 600;
    }
    .font-bold {
      font-weight: 700;
    }
    .tracking-tight {
      letter-spacing: -0.02em;
    }
    .tracking-wide {
      letter-spacing: 0.04em;
    }
    .border {
      border: 1px solid var(--color-border-muted);
    }
    .rounded {
      border-radius: var(--radius-2);
    }
    .rounded-lg {
      border-radius: var(--radius-3);
    }
    .overflow-hidden {
      overflow: hidden;
    }
    .relative {
      position: relative;
    }
    .cursor-pointer {
      cursor: pointer;
    }
    .inline-flex {
      display: inline-flex;
    }
    .items-center {
      align-items: center;
    }
    .justify-between {
      justify-content: space-between;
    }
    .flex-1 {
      flex: 1;
    }
    .min-w-0 {
      min-width: 0;
    }