:root {
    --ink: #0a0f14;
    --ink-2: #0f1620;
    --surface: #131c27;
    --surface-2: #1a2532;
    --surface-3: #233040;
    --border: #243345;
    --border-soft: #1b2532;
    --text: #e8edf3;
    --text-soft: #b4c2d0;
    --text-mute: #7e8e9d;
    --flow: #14b8a6;
    --flow-2: #06b6d4;
    --fire: #f59e0b;
    --fire-2: #fb923c;
    --danger: #ef4444;
    --success: #22c55e;
    --violet: #a78bfa;
    --serif: 'Fraunces', Georgia, serif;
    --sans: 'Manrope', system-ui, sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, monospace;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--sans);
    background: var(--ink);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
  }

  .bg-deco {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
      radial-gradient(ellipse 80% 50% at 50% -10%, rgba(20, 184, 166, 0.08), transparent 60%),
      radial-gradient(ellipse 60% 40% at 100% 50%, rgba(245, 158, 11, 0.05), transparent 60%),
      var(--ink);
  }
  .bg-deco::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(rgba(36, 51, 69, 0.25) 1px, transparent 1px),
      linear-gradient(90deg, rgba(36, 51, 69, 0.25) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 30%, transparent 80%);
  }

  .wrap { max-width: 1240px; margin: 0 auto; padding: 0 32px; }

  /* ===== Shared site bar ===== */
  .sitebar { position: sticky; top: 0; z-index: 60; backdrop-filter: blur(14px); background: rgba(10, 15, 20, 0.85); border-bottom: 1px solid var(--border-soft); }
  .sitebar-inner { max-width: 1240px; margin: 0 auto; padding: 12px 32px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
  .site-brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 600; font-style: italic; font-size: 16px; color: var(--text); text-decoration: none; white-space: nowrap; }
  .site-mark { width: 24px; height: 24px; border-radius: 7px; background: linear-gradient(135deg, var(--flow), #6366f1); position: relative; overflow: hidden; flex-shrink: 0; }
  .site-mark::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.5), transparent 60%); }
  .site-links { display: flex; gap: 4px; flex-wrap: wrap; }
  .site-links a { font-family: var(--sans); font-size: 13px; color: var(--text-mute); text-decoration: none; padding: 6px 12px; border-radius: 8px; transition: all 0.18s; white-space: nowrap; }
  .site-links a:hover { color: var(--text); background: rgba(255,255,255,0.04); }
  .site-links a.active { color: var(--flow); background: rgba(20,184,166,0.1); font-weight: 600; }
  @media (max-width: 720px) { .site-links a { padding: 6px 9px; font-size: 12px; } .site-brand span:not(.site-mark) { display: none; } }

  /* Top bar */
  .topbar {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(14px);
    background: rgba(10, 15, 20, 0.78);
    border-bottom: 1px solid var(--border-soft);
  }
  .topbar-inner {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 32px; max-width: 1240px; margin: 0 auto;
    gap: 24px; flex-wrap: wrap;
  }
  .brand {
    display: flex; align-items: center; gap: 12px;
    font-family: var(--serif); font-weight: 600; font-style: italic; font-size: 18px;
  }
  .brand-mark {
    width: 28px; height: 28px; border-radius: 8px;
    background: linear-gradient(135deg, var(--flow), var(--flow-2));
    position: relative; overflow: hidden;
  }
  .brand-mark::after {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.5), transparent 60%);
  }
  .topnav { display: flex; gap: 22px; font-size: 13px; color: var(--text-soft); }
  .topnav a { color: inherit; text-decoration: none; transition: color 0.2s; }
  .topnav a:hover { color: var(--flow); }
  @media (max-width: 980px) { .topnav { display: none; } }

  /* SYNTAX TOGGLE */
  .syntax-toggle {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px; padding-left: 14px;
    background: var(--ink-2);
    border: 1px solid var(--border);
    border-radius: 10px;
  }
  .syntax-toggle .label {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-mute);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-right: 4px;
  }
  .syntax-toggle button {
    background: transparent;
    border: none;
    color: var(--text-mute);
    padding: 6px 12px;
    border-radius: 6px;
    font-family: var(--mono);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
  }
  .syntax-toggle button:hover { color: var(--text); }
  .syntax-toggle button.active {
    background: var(--flow);
    color: var(--ink);
    font-weight: 600;
  }

  /* Show/hide based on body class */
  body.syntax-modern  .syntax-classic { display: none; }
  body.syntax-classic .syntax-modern  { display: none; }

  /* Hero */
  .hero { padding: 100px 0 80px; position: relative; }
  .eyebrow {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 6px 14px; border: 1px solid var(--border); border-radius: 999px;
    font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
    text-transform: uppercase; color: var(--text-soft); margin-bottom: 32px;
  }
  .eyebrow::before {
    content: ''; width: 6px; height: 6px; border-radius: 50%;
    background: var(--flow); box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.15);
  }
  h1.title {
    font-family: var(--serif); font-weight: 500;
    font-size: clamp(48px, 7vw, 96px); line-height: 0.98;
    letter-spacing: -0.04em; margin-bottom: 28px;
  }
  h1.title em { font-style: italic; font-weight: 400; color: var(--flow); }
  .lede {
    font-size: clamp(18px, 1.6vw, 22px); color: var(--text-soft);
    max-width: 680px; line-height: 1.5; margin-bottom: 40px;
  }
  .hero-meta {
    display: flex; gap: 40px; flex-wrap: wrap;
    padding-top: 32px; border-top: 1px solid var(--border-soft);
  }
  .meta-item .label {
    font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em;
    text-transform: uppercase; color: var(--text-mute); margin-bottom: 4px;
  }
  .meta-item .value { font-family: var(--serif); font-size: 18px; color: var(--text); }

  /* Sections */
  section.chapter { padding: 100px 0; position: relative; }
  .chapter-num {
    font-family: var(--mono); font-size: 12px; letter-spacing: 0.15em;
    color: var(--flow); margin-bottom: 16px;
    display: flex; align-items: center; gap: 12px;
  }
  .chapter-num::after {
    content: ''; flex: 1; height: 1px;
    background: linear-gradient(to right, var(--flow), transparent); opacity: 0.4;
  }
  h2.chapter-title {
    font-family: var(--serif); font-weight: 500;
    font-size: clamp(36px, 4.5vw, 56px); line-height: 1.02;
    letter-spacing: -0.03em; margin-bottom: 24px; max-width: 800px;
  }
  h2.chapter-title em { font-style: italic; color: var(--fire); font-weight: 400; }
  .chapter-intro {
    font-size: 18px; color: var(--text-soft); max-width: 720px; margin-bottom: 48px;
  }
  h3 {
    font-family: var(--serif); font-weight: 500; font-size: 28px;
    letter-spacing: -0.02em; margin: 40px 0 16px;
  }
  h4 {
    font-family: var(--sans); font-weight: 600;
    font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--flow); margin: 28px 0 12px;
  }
  p { margin-bottom: 16px; color: var(--text-soft); }
  p strong { color: var(--text); font-weight: 600; }

  /* Code blocks */
  pre.code-block {
    background: var(--ink-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 28px;
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.7;
    overflow-x: auto;
    margin: 16px 0;
    position: relative;
    white-space: pre;
    color: var(--text-soft);
    tab-size: 2;
  }
  pre.code-block::before {
    content: attr(data-lang);
    position: absolute; top: 12px; right: 16px;
    font-size: 10px; color: var(--text-mute);
    letter-spacing: 0.1em; text-transform: uppercase;
    background: var(--ink-2); padding: 2px 4px;
  }
  pre.code-block .kw   { color: #c084fc; }
  pre.code-block .typ  { color: var(--flow); }
  pre.code-block .str  { color: var(--fire-2); }
  pre.code-block .num  { color: #fbbf24; }
  pre.code-block .com  { color: var(--text-mute); font-style: italic; }
  pre.code-block .fn   { color: #60a5fa; }
  pre.code-block .anno { color: var(--success); }
  pre.code-block .dec  { color: var(--violet); font-weight: 500; }

  /* Code badge shown when classic version is active */
  pre.code-block.syntax-classic::after {
    content: 'classic';
    position: absolute; top: 12px; right: 56px;
    font-size: 9px; color: var(--fire);
    letter-spacing: 0.15em; text-transform: uppercase;
    background: rgba(245, 158, 11, 0.1);
    padding: 2px 6px; border-radius: 4px;
    border: 1px solid rgba(245, 158, 11, 0.3);
  }
  pre.code-block.syntax-modern::after {
    content: 'codegen';
    position: absolute; top: 12px; right: 56px;
    font-size: 9px; color: var(--success);
    letter-spacing: 0.15em; text-transform: uppercase;
    background: rgba(34, 197, 94, 0.1);
    padding: 2px 6px; border-radius: 4px;
    border: 1px solid rgba(34, 197, 94, 0.3);
  }

  /* Mental model */
  .mental-model {
    display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin: 32px 0;
  }
  @media (max-width: 760px) { .mental-model { grid-template-columns: 1fr; } }
  .mm-card {
    padding: 32px; background: var(--surface);
    border: 1px solid var(--border); border-radius: 16px; position: relative;
  }
  .mm-card.bad  { border-color: rgba(239, 68, 68, 0.3); }
  .mm-card.good { border-color: rgba(20, 184, 166, 0.3); }
  .mm-tag {
    font-family: var(--mono); font-size: 10px; text-transform: uppercase;
    letter-spacing: 0.1em; color: var(--danger); margin-bottom: 8px;
  }
  .mm-card.good .mm-tag { color: var(--flow); }
  .mm-title { font-family: var(--serif); font-size: 22px; margin-bottom: 12px; }

  /* Data flow */
  .flow-stack {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px; margin: 32px 0;
    position: relative; overflow: hidden;
  }
  .flow-stack h4 { margin-top: 0; }
  .layer-row {
    display: grid; grid-template-columns: 200px 1fr; gap: 24px;
    align-items: center; padding: 18px 20px; margin-bottom: 12px;
    background: var(--ink-2); border: 1px solid var(--border);
    border-radius: 12px;
    transition: border-color 0.3s, background 0.3s, transform 0.3s;
  }
  .layer-row.lit {
    border-color: var(--flow);
    background: rgba(20, 184, 166, 0.08);
    transform: translateX(8px);
  }
  .layer-row.lit-fire {
    border-color: var(--fire);
    background: rgba(245, 158, 11, 0.08);
    transform: translateX(8px);
  }
  .layer-meta { display: flex; flex-direction: column; gap: 4px; }
  .layer-tag {
    font-family: var(--mono); font-size: 10px;
    letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-mute);
  }
  .layer-name {
    font-family: var(--serif); font-size: 20px;
    color: var(--text); letter-spacing: -0.01em;
  }
  .layer-desc { font-size: 13px; color: var(--text-soft); }
  .layer-row.lit .layer-tag { color: var(--flow); }
  .layer-row.lit-fire .layer-tag { color: var(--fire); }
  .flow-controls {
    display: flex; gap: 12px; margin-top: 24px;
    padding-top: 24px; border-top: 1px solid var(--border-soft);
    flex-wrap: wrap;
  }

  /* Folder tree */
  .tree-wrap {
    display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px;
    align-items: start; margin-top: 32px;
  }
  @media (max-width: 900px) { .tree-wrap { grid-template-columns: 1fr; } }
  .tree {
    font-family: var(--mono); font-size: 13px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 16px; padding: 28px; line-height: 1.85;
    overflow-x: auto; white-space: pre;
  }
  .tree .folder { color: var(--flow); cursor: pointer; transition: color 0.2s; }
  .tree .folder:hover { color: var(--fire); }
  .tree .folder.active { color: var(--fire); font-weight: 600; }
  .tree .file { color: var(--text-soft); }
  .tree .comment { color: var(--text-mute); font-style: italic; }
  .tree .arrow { color: var(--text-mute); }
  .tree-explain {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 16px; padding: 28px; min-height: 320px;
    position: sticky; top: 90px;
  }
  .tree-explain .layer-pill {
    display: inline-block; font-family: var(--mono); font-size: 11px;
    padding: 4px 10px; border-radius: 6px;
    background: rgba(20, 184, 166, 0.15); color: var(--flow); margin-bottom: 12px;
  }
  .tree-explain h4 {
    margin: 0 0 12px; color: var(--text); font-family: var(--serif);
    font-size: 22px; text-transform: none; letter-spacing: -0.01em;
  }
  .tree-explain p { font-size: 14px; }

  /* Provider type cards */
  .ptypes {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px; margin: 32px 0;
  }
  .ptype {
    padding: 24px; background: var(--surface);
    border: 1px solid var(--border); border-radius: 14px;
    transition: transform 0.2s, border-color 0.2s;
  }
  .ptype:hover { transform: translateY(-2px); border-color: var(--flow); }
  .ptype-name { font-family: var(--mono); font-size: 13px; color: var(--flow); margin-bottom: 8px; }
  .ptype-purpose { font-family: var(--serif); font-size: 17px; margin-bottom: 12px; line-height: 1.3; }
  .ptype-desc { font-size: 13px; color: var(--text-soft); }

  /* Picker */
  .picker {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 36px; margin: 32px 0;
    position: relative; overflow: hidden;
  }
  .picker-progress { display: flex; gap: 6px; margin-bottom: 24px; }
  .picker-progress .step {
    flex: 1; height: 4px; background: var(--surface-3);
    border-radius: 2px; transition: background 0.3s;
  }
  .picker-progress .step.active { background: var(--flow); }
  .picker-progress .step.done { background: var(--success); }
  .picker-question {
    font-family: var(--serif); font-size: 26px; font-weight: 500;
    letter-spacing: -0.01em; margin-bottom: 8px; line-height: 1.2;
  }
  .picker-hint { color: var(--text-mute); font-size: 14px; margin-bottom: 28px; }
  .picker-options { display: grid; gap: 12px; }
  .picker-option {
    text-align: left;
    background: var(--ink-2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 18px 22px; border-radius: 12px;
    font-family: var(--sans); font-size: 15px;
    cursor: pointer; transition: all 0.2s;
    display: flex; align-items: center; gap: 14px;
  }
  .picker-option::before {
    content: ''; width: 18px; height: 18px;
    border: 1.5px solid var(--text-mute); border-radius: 50%;
    flex-shrink: 0; transition: all 0.2s;
  }
  .picker-option:hover {
    border-color: var(--flow); background: rgba(20, 184, 166, 0.05);
  }
  .picker-option:hover::before { border-color: var(--flow); }
  .picker-result { padding: 8px 0; }
  .picker-result .result-tag {
    display: inline-block;
    font-family: var(--mono); font-size: 11px;
    padding: 4px 10px; border-radius: 6px;
    background: rgba(245, 158, 11, 0.15); color: var(--fire);
    margin-bottom: 16px; letter-spacing: 0.1em; text-transform: uppercase;
  }
  .picker-result h3 {
    font-family: var(--serif); font-size: 32px; margin: 0 0 12px;
    color: var(--text); letter-spacing: -0.02em;
  }
  .picker-result h3 em { color: var(--flow); font-style: italic; }
  .picker-result .result-why {
    font-size: 15px; color: var(--text-soft); margin-bottom: 20px;
  }

  /* Demos */
  .demo {
    margin: 32px 0; border: 1px solid var(--border);
    border-radius: 18px; overflow: hidden; background: var(--surface);
  }
  .demo-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 24px; border-bottom: 1px solid var(--border-soft);
    background: var(--ink-2);
  }
  .demo-head .dot-group { display: flex; gap: 6px; }
  .demo-head .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--surface-3); }
  .demo-head .title-pill {
    font-family: var(--mono); font-size: 11px;
    letter-spacing: 0.1em; color: var(--text-mute); text-transform: uppercase;
  }
  .demo-grid { display: grid; grid-template-columns: 1fr 1fr; }
  @media (max-width: 900px) { .demo-grid { grid-template-columns: 1fr; } }
  .demo-pane { padding: 28px; min-height: 280px; }
  .demo-pane.app {
    background: radial-gradient(ellipse at top, rgba(20, 184, 166, 0.06), transparent 60%), var(--ink-2);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 20px; border-right: 1px solid var(--border-soft); position: relative;
  }
  @media (max-width: 900px) {
    .demo-pane.app { border-right: none; border-bottom: 1px solid var(--border-soft); }
  }
  .demo-pane.code { padding: 0; background: var(--ink-2); }
  .demo-pane.code pre.code-block {
    margin: 0; border: none; border-radius: 0;
    min-height: 100%; background: transparent;
  }

  /* Counter */
  .counter-stage { display: grid; gap: 24px; width: 100%; max-width: 360px; }
  .device-frame {
    border: 1px solid var(--border); border-radius: 24px;
    padding: 28px 24px; background: var(--ink);
    display: flex; flex-direction: column; align-items: center; gap: 16px;
    position: relative; transition: box-shadow 0.4s;
  }
  .device-label {
    font-family: var(--mono); font-size: 10px; color: var(--text-mute);
    text-transform: uppercase; letter-spacing: 0.15em;
  }
  .counter-display {
    font-family: var(--serif); font-size: 64px; font-weight: 500;
    color: var(--text); transition: color 0.3s, transform 0.3s; line-height: 1;
  }
  .counter-display.rebuild {
    color: var(--fire);
    text-shadow: 0 0 24px rgba(245, 158, 11, 0.5);
  }

  /* Widget tree */
  .widget-tree {
    background: var(--ink-2); border: 1px solid var(--border);
    border-radius: 12px; padding: 20px;
    font-family: var(--mono); font-size: 12px; line-height: 1.8;
  }
  .widget-tree .wt-row {
    padding: 6px 10px; border-radius: 6px;
    transition: all 0.3s;
    display: flex; align-items: center; gap: 8px;
  }
  .widget-tree .wt-row.rebuild {
    background: rgba(245, 158, 11, 0.15); color: var(--fire);
  }
  .widget-tree .wt-row .wt-marker {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--surface-3); flex-shrink: 0;
    transition: all 0.3s;
  }
  .widget-tree .wt-row.rebuild .wt-marker {
    background: var(--fire); box-shadow: 0 0 8px var(--fire);
  }
  .widget-tree .wt-indent { color: var(--text-mute); }
  .widget-tree .wt-name { color: var(--flow); }
  .widget-tree .wt-row.rebuild .wt-name { color: var(--fire); }
  .widget-tree .wt-note { color: var(--text-mute); margin-left: auto; font-style: italic; font-size: 10px; }

  /* Flavor demo */
  .flavor-badge {
    font-family: var(--mono); font-size: 11px; font-weight: 600;
    letter-spacing: 0.15em; padding: 4px 12px; border-radius: 6px;
    border: 1px solid transparent; transition: all 0.3s;
  }
  .flavor-badge.dev     { background: rgba(245, 158, 11, 0.15); color: var(--fire);   border-color: rgba(245, 158, 11, 0.35); }
  .flavor-badge.staging { background: rgba(167, 139, 250, 0.15); color: var(--violet); border-color: rgba(167, 139, 250, 0.35); }
  .flavor-badge.prod    { background: rgba(20, 184, 166, 0.15); color: var(--flow);   border-color: rgba(20, 184, 166, 0.35); }
  .flavor-field {
    display: flex; justify-content: space-between; align-items: center;
    width: 100%; gap: 16px; padding: 8px 0;
    border-top: 1px solid var(--border-soft);
  }
  .flavor-field-label {
    font-family: var(--mono); font-size: 10px; text-transform: uppercase;
    letter-spacing: 0.1em; color: var(--text-mute);
  }
  .flavor-field-value {
    font-family: var(--mono); font-size: 12px; color: var(--text-soft);
    text-align: right; word-break: break-all;
  }

  /* Console */
  .console {
    background: #050a10; border: 1px solid var(--border);
    border-radius: 12px; padding: 16px 18px;
    font-family: var(--mono); font-size: 11px; line-height: 1.7;
    height: 140px; overflow-y: auto; color: var(--text-soft);
  }
  .console .log-time { color: var(--text-mute); }
  .console .log-tag { color: var(--flow); }
  .console .log-tag.state { color: var(--fire); }
  .console .log-tag.rebuild { color: var(--violet); }
  .console .log-tag.error { color: var(--danger); }
  .console .log-line {
    opacity: 0; animation: logFadeIn 0.3s forwards;
  }
  @keyframes logFadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* Buttons */
  .btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; background: var(--flow); color: var(--ink);
    border: none; border-radius: 10px; font-family: var(--sans);
    font-weight: 600; font-size: 14px; cursor: pointer; transition: all 0.2s;
  }
  .btn:hover { background: var(--flow-2); transform: translateY(-1px); }
  .btn:active { transform: translateY(0); }
  .btn.ghost {
    background: transparent; color: var(--text-soft);
    border: 1px solid var(--border);
  }
  .btn.ghost:hover { border-color: var(--flow); color: var(--flow); background: rgba(20, 184, 166, 0.05); }
  .btn.danger { background: var(--danger); color: white; }
  .btn.danger:hover { background: #dc2626; }
  .btn.small { padding: 8px 14px; font-size: 12px; }

  /* Async demo */
  .async-stage {
    width: 100%; max-width: 320px; padding: 24px;
    border-radius: 16px; background: var(--ink);
    border: 1px solid var(--border); min-height: 160px;
    display: flex; align-items: center; justify-content: center;
    transition: border-color 0.3s;
  }
  .async-stage.loading { border-color: var(--flow); }
  .async-stage.error { border-color: var(--danger); }
  .async-stage.data { border-color: var(--success); }
  .spinner {
    width: 32px; height: 32px;
    border: 3px solid var(--surface-3); border-top-color: var(--flow);
    border-radius: 50%; animation: spin 0.8s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  .user-card { width: 100%; }
  .user-card .avatar {
    width: 64px; height: 64px; border-radius: 50%;
    background: linear-gradient(135deg, var(--flow), var(--violet));
    display: flex; align-items: center; justify-content: center;
    font-family: var(--serif); font-size: 28px; font-weight: 600;
    color: var(--ink); margin: 0 auto 16px;
  }
  .user-card .name { font-family: var(--serif); font-size: 20px; text-align: center; margin-bottom: 4px; }
  .user-card .email { font-family: var(--mono); font-size: 12px; color: var(--text-mute); text-align: center; }
  .async-error { text-align: center; }
  .async-error .icon { font-family: var(--serif); font-size: 32px; color: var(--danger); margin-bottom: 8px; }
  .async-error .msg { font-family: var(--mono); font-size: 12px; color: var(--danger); }
  .control-row { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }

  /* State machine */
  .state-machine {
    display: flex; justify-content: space-around; align-items: center;
    width: 100%; max-width: 320px; padding: 16px; gap: 8px;
  }
  .sm-node {
    flex: 1; padding: 12px 8px;
    border: 1.5px solid var(--surface-3); border-radius: 10px;
    text-align: center; font-family: var(--mono); font-size: 10px;
    text-transform: uppercase; letter-spacing: 0.1em;
    color: var(--text-mute); transition: all 0.3s; background: var(--ink-2);
  }
  .sm-node.active.loading {
    border-color: var(--flow); color: var(--flow);
    box-shadow: 0 0 16px rgba(20, 184, 166, 0.3);
  }
  .sm-node.active.data {
    border-color: var(--success); color: var(--success);
    box-shadow: 0 0 16px rgba(34, 197, 94, 0.3);
  }
  .sm-node.active.error {
    border-color: var(--danger); color: var(--danger);
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.3);
  }
  .sm-arrow { color: var(--text-mute); font-family: var(--mono); font-size: 14px; }

  /* Stream */
  .ticker {
    width: 100%; max-width: 320px; padding: 24px;
    border-radius: 16px; background: var(--ink);
    border: 1px solid var(--border);
  }
  .ticker .symbol {
    font-family: var(--mono); font-size: 11px;
    letter-spacing: 0.15em; color: var(--text-mute); margin-bottom: 8px;
  }
  .ticker .price {
    font-family: var(--serif); font-size: 42px; font-weight: 500;
    transition: color 0.4s;
  }
  .ticker .price.up { color: var(--success); }
  .ticker .price.down { color: var(--danger); }
  .ticker .delta {
    font-family: var(--mono); font-size: 13px; margin-top: 4px;
    color: var(--text-mute);
  }
  .ticker .delta.up { color: var(--success); }
  .ticker .delta.down { color: var(--danger); }
  .sparkline {
    margin-top: 16px; height: 60px; width: 100%;
    display: flex; align-items: flex-end; gap: 2px;
  }
  .sparkline .bar {
    flex: 1; background: var(--flow); border-radius: 2px 2px 0 0;
    opacity: 0.5; transition: height 0.3s, opacity 0.3s;
  }
  .sparkline .bar:last-child { opacity: 1; }

  /* Ref table */
  .ref-table {
    width: 100%; border-collapse: separate; border-spacing: 0;
    margin: 24px 0; font-size: 14px;
  }
  .ref-table th, .ref-table td {
    text-align: left; padding: 16px 20px;
    border-bottom: 1px solid var(--border-soft); vertical-align: top;
  }
  .ref-table th {
    font-family: var(--mono); font-size: 11px;
    color: var(--text-mute); text-transform: uppercase;
    letter-spacing: 0.1em; font-weight: 500;
    border-bottom: 1px solid var(--border);
  }
  .ref-table td:first-child {
    font-family: var(--mono); font-size: 13px; color: var(--flow); width: 25%;
  }
  .ref-table td { color: var(--text-soft); }

  /* Modifiers */
  .mod-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 32px 0;
  }
  @media (max-width: 760px) { .mod-grid { grid-template-columns: 1fr; } }

  /* Pitfalls */
  .pitfall {
    padding: 24px 28px; border-left: 3px solid var(--fire);
    background: rgba(245, 158, 11, 0.04);
    border-radius: 0 12px 12px 0; margin: 16px 0;
  }
  .pitfall .tag {
    font-family: var(--mono); font-size: 10px; text-transform: uppercase;
    letter-spacing: 0.15em; color: var(--fire); margin-bottom: 6px;
  }
  .pitfall h4 {
    color: var(--text); font-family: var(--serif);
    text-transform: none; letter-spacing: -0.01em;
    font-size: 18px; margin: 0 0 8px;
  }
  .pitfall p { font-size: 14px; margin: 0; }

  /* Footer */
  footer {
    padding: 80px 0 60px; border-top: 1px solid var(--border-soft);
    margin-top: 60px; text-align: center;
  }
  footer .closer {
    font-family: var(--serif); font-style: italic; font-size: 28px;
    color: var(--text); max-width: 560px; margin: 0 auto 24px; line-height: 1.3;
  }
  footer .signoff {
    font-family: var(--mono); font-size: 11px; color: var(--text-mute);
    letter-spacing: 0.1em; text-transform: uppercase;
  }

  .inline-code {
    font-family: var(--mono); font-size: 0.9em;
    background: var(--surface-2); padding: 2px 6px;
    border-radius: 4px; color: var(--flow);
  }

  ul.bullet { list-style: none; margin: 16px 0; }
  ul.bullet li {
    padding-left: 24px; position: relative;
    margin-bottom: 10px; color: var(--text-soft); font-size: 15px;
  }
  ul.bullet li::before {
    content: ''; position: absolute; left: 0; top: 10px;
    width: 8px; height: 8px; border: 1px solid var(--flow);
    transform: rotate(45deg);
  }

  .divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border), transparent);
    margin: 60px 0;
  }

  /* Banner explaining the toggle on first visit */
  .toggle-banner {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.08), rgba(245, 158, 11, 0.04));
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 20px 24px;
    margin: 32px 0;
    display: flex; align-items: center; gap: 16px;
    font-size: 14px;
  }
  .toggle-banner .icon {
    width: 40px; height: 40px; flex-shrink: 0;
    border-radius: 10px;
    background: rgba(20, 184, 166, 0.15);
    display: flex; align-items: center; justify-content: center;
    color: var(--flow); font-family: var(--mono); font-size: 18px;
  }
  .toggle-banner p { margin: 0; color: var(--text-soft); }