/* ============================================================
       REFERENCE ARCHITECTURE FOR AI
       Warp Drive Mobile-First theme, G2 colour scheme
       ============================================================ */

    :root {
      --void:         oklch(0.08 0.025 260);
      --void-deep:    oklch(0.06 0.03 260);
      --surface:      oklch(0.12 0.02 260 / 0.75);
      --surface-solid: oklch(0.12 0.025 260);
      --panel:        oklch(0.14 0.025 260 / 0.82);
      --panel-hover:  oklch(0.18 0.03 260 / 0.88);
      --border:       oklch(0.30 0.05 250 / 0.25);
      --border-bright: oklch(0.45 0.08 250 / 0.35);

      --warp-blue:    oklch(0.68 0.18 240);
      --warp-bright:  oklch(0.78 0.16 230);
      --warp-streak:  oklch(0.88 0.10 225);
      --electric:     oklch(0.62 0.20 245);
      --amber:        oklch(0.72 0.16 70);
      --amber-dim:    oklch(0.58 0.12 70);
      --green:        oklch(0.72 0.18 155);
      --green-dim:    oklch(0.55 0.12 155);
      --red:          oklch(0.60 0.22 25);

      --text-bright:  oklch(0.90 0.02 250);
      --text:         oklch(0.72 0.03 250);
      --text-dim:     oklch(0.48 0.03 250);
      --text-muted:   oklch(0.30 0.02 250);

      --radius: 4px;
      --radius-lg: 8px;
      --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
      --transition: 0.2s var(--ease-out);
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }

    body {
      font-family: 'Onest', system-ui, -apple-system, sans-serif;
      background: var(--void);
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    /* ---- Warp tunnel canvas ---- */
    .warp-canvas {
      position: fixed;
      inset: 0;
      z-index: 0;
      pointer-events: none;
    }

    .star-field-fallback {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 0;
      pointer-events: none;
      background:
        radial-gradient(1px 1px at 10% 15%, var(--warp-streak) 0%, transparent 100%),
        radial-gradient(1px 1px at 25% 45%, oklch(0.70 0.08 225) 0%, transparent 100%),
        radial-gradient(1px 1px at 40% 20%, var(--warp-streak) 0%, transparent 100%),
        radial-gradient(1px 1px at 55% 75%, oklch(0.65 0.10 240) 0%, transparent 100%),
        radial-gradient(1px 1px at 70% 35%, var(--warp-streak) 0%, transparent 100%),
        radial-gradient(1px 1px at 85% 60%, oklch(0.60 0.06 230) 0%, transparent 100%);
    }

    body::after {
      content: '';
      position: fixed;
      inset: 0;
      background: radial-gradient(ellipse at 50% 50%, transparent 40%, oklch(0.04 0.02 260 / 0.6) 100%);
      pointer-events: none;
      z-index: 1;
    }

    .skip-link {
      position: absolute;
      top: -100%;
      left: 1rem;
      z-index: 1000;
      padding: 0.5rem 1rem;
      background: var(--warp-blue);
      color: var(--void-deep);
      font-weight: 600;
      text-decoration: none;
      border-radius: var(--radius);
    }
    .skip-link:focus { top: 1rem; }

    main { position: relative; z-index: 10; }

    /* ---- RIBBON (desktop) ---- */
    .ribbon {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      display: none;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.5rem;
      height: 36px;
      background: oklch(0.06 0.02 260 / 0.92);
      border-bottom: 1px solid var(--border);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.6rem;
    }
    @media (min-width: 768px) { .ribbon { display: flex; } }

    .ribbon-brand {
      font-family: 'Space Grotesk', sans-serif;
      font-weight: 700;
      font-size: 0.75rem;
      color: var(--text-bright);
      letter-spacing: 0.08em;
    }

    .ribbon-resources {
      display: flex;
      gap: 1.5rem;
      align-items: center;
    }

    .ribbon-resource {
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }
    .ribbon-resource i { font-size: 0.45rem; }
    .ribbon-resource .r-label { color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; }
    .ribbon-resource .r-value { color: var(--text-bright); font-weight: 500; }
    .ribbon-resource.s-green i { color: var(--green); }
    .ribbon-resource.s-blue i { color: var(--warp-blue); }
    .ribbon-resource.s-amber i { color: var(--amber); }

    /* ---- HERO ---- */
    .hero {
      min-height: 100svh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 2rem 1.25rem 3rem;
    }

    .hero-overline {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.65rem;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--amber);
      margin-bottom: 1.25rem;
      opacity: 0;
      animation: fadeUp 0.5s var(--ease-out) 0.2s forwards;
    }
    .hero-overline i { margin-right: 0.4rem; }

    .hero-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: clamp(2rem, 8vw, 4.5rem);
      font-weight: 700;
      line-height: 1.08;
      color: var(--text-bright);
      margin-bottom: 1.25rem;
      opacity: 0;
      animation: fadeUp 0.5s var(--ease-out) 0.35s forwards;
    }

    .hero-title .accent {
      background: linear-gradient(135deg, var(--warp-blue), var(--warp-bright));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-subtitle {
      font-size: 0.95rem;
      line-height: 1.65;
      color: var(--text);
      max-width: 580px;
      margin: 0 auto 2rem;
      opacity: 0;
      animation: fadeUp 0.5s var(--ease-out) 0.5s forwards;
    }

    .hero-actions {
      display: flex;
      gap: 0.75rem;
      justify-content: center;
      flex-wrap: wrap;
      opacity: 0;
      animation: fadeUp 0.5s var(--ease-out) 0.65s forwards;
    }

    @keyframes fadeUp {
      to { opacity: 1; transform: translateY(0); }
    }

    .hero-overline,
    .hero-title,
    .hero-subtitle,
    .hero-actions { transform: translateY(12px); }

    .scroll-hint {
      margin-top: auto;
      padding-top: 2rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.4rem;
      opacity: 0;
      animation: fadeUp 0.5s var(--ease-out) 1s forwards;
      transform: translateY(0);
    }

    .scroll-hint span {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.55rem;
      text-transform: uppercase;
      letter-spacing: 0.15em;
      color: var(--text-dim);
    }

    .scroll-chevrons {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1px;
    }

    .scroll-chevrons i {
      color: var(--warp-blue);
      font-size: 0.5rem;
      opacity: 0.3;
      animation: pulse 2s ease infinite;
    }
    .scroll-chevrons i:nth-child(2) { animation-delay: 0.15s; }
    .scroll-chevrons i:nth-child(3) { animation-delay: 0.3s; }

    @keyframes pulse {
      0%, 100% { opacity: 0.2; }
      50% { opacity: 0.8; }
    }

    /* ---- Buttons ---- */
    .btn {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.7rem 1.4rem;
      font-family: 'Space Grotesk', sans-serif;
      font-size: 0.8rem;
      font-weight: 600;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      text-decoration: none;
      border: none;
      border-radius: var(--radius);
      cursor: pointer;
      transition: transform 0.15s var(--ease-out), box-shadow 0.15s var(--ease-out);
    }
    .btn:active { transform: scale(0.97); }

    .btn-primary {
      background: linear-gradient(135deg, var(--warp-blue), var(--electric));
      color: var(--void-deep);
      box-shadow: 0 0 20px oklch(0.68 0.18 240 / 0.3);
    }
    .btn-primary:hover { box-shadow: 0 0 30px oklch(0.68 0.18 240 / 0.5); }

    .btn-ghost {
      background: transparent;
      color: var(--text-bright);
      border: 1px solid var(--border-bright);
    }
    .btn-ghost:hover {
      border-color: var(--warp-blue);
      background: oklch(0.68 0.18 240 / 0.08);
    }

    /* ---- HYPERDRIVE STATS ---- */
    .hyperdrive { padding: 2rem 1.25rem; }

    .hyperdrive-panel {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 1.5rem;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      overflow: hidden;
    }

    .hyperdrive-panel::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--warp-blue), transparent);
    }

    .hyperdrive-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 1.25rem;
    }

    .hyperdrive-header i { font-size: 1.2rem; color: var(--warp-blue); }

    .hyperdrive-header h2 {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-bright);
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .charge-pct {
      margin-left: auto;
      font-family: 'JetBrains Mono', monospace;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--warp-bright);
    }

    .gauge {
      width: 100%;
      height: 24px;
      background: var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      position: relative;
      margin-bottom: 1.5rem;
    }

    .gauge-fill {
      position: absolute;
      top: 0; left: 0;
      height: 100%;
      width: 0%;
      background: linear-gradient(90deg, var(--electric), var(--warp-blue), var(--warp-bright));
      border-radius: var(--radius);
      transition: width 0.3s var(--ease-out);
      box-shadow: 0 0 16px oklch(0.68 0.18 240 / 0.4);
    }

    .gauge-segments {
      position: absolute;
      inset: 0;
      display: flex;
    }

    .gauge-segments span {
      flex: 1;
      border-right: 1px solid oklch(0.20 0.02 260 / 0.3);
    }
    .gauge-segments span:last-child { border-right: none; }

    .stats-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.75rem;
    }

    .stat { display: flex; flex-direction: column; gap: 0.15rem; }

    .stat-label {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.55rem;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-dim);
    }

    .stat-value {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-bright);
    }
    .stat-value.blue { color: var(--warp-bright); }
    .stat-value.amber { color: var(--amber); }
    .stat-value.green { color: var(--green); }

    /* ---- SECTION SHARED ---- */
    .section { padding: 3rem 1.25rem; }

    .section-inner { max-width: 1100px; margin: 0 auto; }

    .section-overline {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.6rem;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--amber);
      margin-bottom: 0.75rem;
    }
    .section-overline i { margin-right: 0.4rem; }

    .section-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: clamp(1.5rem, 5vw, 2.25rem);
      font-weight: 700;
      color: var(--text-bright);
      line-height: 1.15;
      margin-bottom: 0.5rem;
    }

    .section-subtitle {
      font-size: 0.9rem;
      color: var(--text);
      max-width: 540px;
      margin-bottom: 2rem;
    }

    /* ---- ARCHITECTURE DIAGRAM ---- */
    .arch-diagram {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 1.5rem;
      max-width: 900px;
      margin: 0 auto 2rem;
      overflow-x: auto;
    }

    .arch-diagram svg {
      width: 100%;
      height: auto;
      min-width: 600px;
    }

    /* ---- WAYPOINTS / CAPABILITIES ---- */
    .waypoints-grid {
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .waypoint {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 1.25rem;
      transition: border-color var(--transition);
    }
    .waypoint:hover { border-color: var(--border-bright); }

    .waypoint-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 0.75rem;
    }

    .waypoint-number {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.55rem;
      color: var(--text-dim);
      letter-spacing: 0.1em;
    }

    .waypoint-icon {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius);
      background: oklch(0.68 0.18 240 / 0.1);
      border: 1px solid oklch(0.68 0.18 240 / 0.2);
      color: var(--warp-blue);
      font-size: 0.9rem;
      flex-shrink: 0;
    }

    .waypoint-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-bright);
    }

    .waypoint-desc {
      font-size: 0.85rem;
      line-height: 1.55;
      color: var(--text);
    }

    /* ---- FAILURE MODES ---- */
    .failure-grid {
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .failure-card {
      background: var(--panel);
      border: 1px solid oklch(0.60 0.22 25 / 0.2);
      border-radius: var(--radius-lg);
      padding: 1.25rem;
    }

    .failure-card-header {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 0.75rem;
    }

    .failure-icon {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius);
      background: oklch(0.60 0.22 25 / 0.1);
      border: 1px solid oklch(0.60 0.22 25 / 0.2);
      color: var(--red);
      font-size: 0.9rem;
      flex-shrink: 0;
    }

    .failure-name {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-bright);
    }

    .failure-desc {
      font-size: 0.85rem;
      line-height: 1.55;
      color: var(--text);
    }

    .failure-fix {
      margin-top: 0.75rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.7rem;
      color: var(--green);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    /* ---- COMPARISON TABLE ---- */
    .comparison { padding: 3rem 1.25rem; }
    .comparison-inner { max-width: 900px; margin: 0 auto; }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.7rem;
    }

    .comparison-table thead th {
      text-align: left;
      padding: 0.6rem 0.75rem;
      border-bottom: 2px solid var(--border-bright);
      color: var(--text-dim);
      font-size: 0.55rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.1em;
    }
    .comparison-table thead th.col-centre { text-align: center; }

    .comparison-table tbody tr { border-bottom: 1px solid var(--border); }
    .comparison-table tbody tr:nth-child(even) { background: oklch(0.10 0.015 260 / 0.3); }

    .comparison-table tbody td { padding: 0.55rem 0.75rem; vertical-align: middle; }
    .comparison-table tbody td.feature-name { color: var(--text-bright); font-weight: 500; }
    .comparison-table tbody td.cell-centre { text-align: center; min-width: 4.5rem; }

    .comparison-table .fa-check { color: var(--green); }
    .comparison-table .fa-xmark { color: var(--red); }
    .comparison-table .fa-minus { color: var(--text-dim); }

    .comparison-table tfoot td {
      padding: 0.6rem 0.75rem;
      border-top: 2px solid var(--border-bright);
      font-weight: 600;
      color: var(--text-bright);
    }

    .table-legend {
      margin-top: 0.75rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.55rem;
      color: var(--text-dim);
    }

    /* ---- WORKFLOW STEPS ---- */
    .workflow-grid {
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .workflow-step {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 1.25rem;
      display: flex;
      gap: 1rem;
      align-items: flex-start;
    }

    .step-number {
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius);
      background: oklch(0.72 0.16 70 / 0.1);
      border: 1px solid oklch(0.72 0.16 70 / 0.2);
      color: var(--amber);
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.9rem;
      font-weight: 700;
      flex-shrink: 0;
    }

    .step-content { flex: 1; }

    .step-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-bright);
      margin-bottom: 0.35rem;
    }

    .step-desc {
      font-size: 0.8rem;
      line-height: 1.55;
      color: var(--text);
    }

    .step-badge {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.55rem;
      font-weight: 600;
      padding: 0.15rem 0.4rem;
      border-radius: var(--radius);
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-top: 0.5rem;
      display: inline-block;
      color: var(--warp-blue);
      background: oklch(0.68 0.18 240 / 0.1);
      border: 1px solid oklch(0.68 0.18 240 / 0.15);
    }

    /* ---- CTA / RESOURCES ---- */
    .resources-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1rem;
    }
    @media (min-width: 640px) { .resources-grid { grid-template-columns: 1fr 1fr; } }
    @media (min-width: 960px) { .resources-grid { grid-template-columns: 1fr 1fr 1fr; } }

    .resource-card {
      background: var(--panel);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 1.25rem;
      text-decoration: none;
      transition: border-color var(--transition);
    }
    .resource-card:hover { border-color: var(--border-bright); }

    .resource-card-icon {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius);
      background: oklch(0.72 0.18 155 / 0.1);
      border: 1px solid oklch(0.72 0.18 155 / 0.2);
      color: var(--green);
      font-size: 0.9rem;
      margin-bottom: 0.75rem;
    }

    .resource-card-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-bright);
      margin-bottom: 0.35rem;
    }

    .resource-card-desc {
      font-size: 0.8rem;
      line-height: 1.5;
      color: var(--text);
    }

    /* ---- FOOTER ---- */
    .footer {
      padding: 2.5rem 1.25rem;
      text-align: center;
      border-top: 1px solid var(--border);
    }

    .footer-brand {
      font-family: 'Space Grotesk', sans-serif;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-bright);
      letter-spacing: 0.08em;
      margin-bottom: 0.25rem;
    }

    .footer-sub {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.6rem;
      color: var(--text-dim);
      text-transform: uppercase;
      letter-spacing: 0.12em;
      margin-bottom: 1.25rem;
    }

    .footer-links {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 1.25rem;
      margin-bottom: 1.25rem;
    }

    .footer-links a {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.65rem;
      color: var(--text);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      transition: color var(--transition);
    }
    .footer-links a:hover { color: var(--warp-blue); }

    .footer-coord {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.5rem;
      color: var(--text-muted);
      letter-spacing: 0.1em;
    }

    /* ---- Desktop breakpoints ---- */
    @media (min-width: 640px) {
      .stats-row { grid-template-columns: repeat(4, 1fr); }
    }

    @media (min-width: 768px) {
      .waypoints-grid { display: grid; grid-template-columns: 1fr 1fr; }
      .failure-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; }
      .workflow-grid { display: grid; grid-template-columns: 1fr 1fr; }
    }

    @media (min-width: 1024px) {
      .waypoints-grid { grid-template-columns: 1fr 1fr 1fr; }
    }

    /* ---- Reduced motion ---- */
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { animation: none !important; transition: none !important; }
      .star-field-fallback { display: block; }
      .hero-overline, .hero-title, .hero-subtitle, .hero-actions, .scroll-hint {
        opacity: 1 !important; transform: none !important;
      }
    }

    /* ---- Print ---- */
    @media print {
      body { background: #fff; color: #222; }
      body::after { display: none; }
      .warp-canvas, .star-field-fallback { display: none; }
      .ribbon, .scroll-hint, .gauge, .gauge-fill, .gauge-segments { display: none; }
      .btn { border: 1px solid #ccc; color: #222; background: none; box-shadow: none; }
      .waypoint, .failure-card, .workflow-step, .resource-card, .hyperdrive-panel, .arch-diagram {
        background: #f9f9f9; border: 1px solid #ddd;
      }
    }

    /* ============================================================
       CONTENT LAYER
       Navigation, long-form articles, listings and archive. None of
       this existed in the landing-page design; it is what lets the
       site's own writing live inside the Warp Drive language.
       ============================================================ */

    /* ---- SVG DIAGRAM TOKENS ----
       The diagrams in /diagrams/ carry their own <style> deriving their
       palette from --bg, --fg and --surface, with Tokyo Night fallbacks.
       Note they are referenced as <img>, and CSS custom properties do NOT
       cross that boundary -- so in practice each diagram paints itself in
       its Tokyo Night fallbacks, which read correctly against --void.
       The definitions below only take effect if a diagram is ever inlined
       into the page; they are kept so that inlining Just Works. --surface
       already means a translucent panel here, so an inlined diagram gets
       the solid variant instead. */
    :root {
      --bg: var(--void);
      --fg: var(--text-bright);
    }
    .prose svg { --surface: var(--surface-solid); max-width: 100%; height: auto; }

    /* ---- NAVIGATION ---- */
    .ribbon-brand {
      color: var(--text-bright);
      text-decoration: none;
      transition: color var(--transition);
    }
    .ribbon-brand:hover { color: var(--warp-bright); }

    .ribbon-nav {
      display: flex;
      align-items: center;
      gap: 1.15rem;
      font-size: 0.7rem;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      font-family: 'JetBrains Mono', monospace;
    }
    .ribbon-nav a {
      color: var(--text-dim);
      text-decoration: none;
      transition: color var(--transition);
    }
    .ribbon-nav a:hover { color: var(--warp-bright); }

    .topbar {
      position: sticky;
      top: 0;
      z-index: 90;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      padding: 0.6rem 1.25rem;
      background: oklch(0.08 0.025 260 / 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    @media (min-width: 768px) { .topbar { display: none; } }

    .topbar-brand {
      font-family: 'Space Grotesk', sans-serif;
      font-weight: 700;
      font-size: 0.95rem;
      letter-spacing: 0.02em;
      color: var(--text-bright);
      text-decoration: none;
    }
    .topbar-brand .accent { color: var(--warp-bright); }

    .topbar-nav { display: flex; gap: 1rem; }
    .topbar-nav a {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.68rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--text-dim);
      text-decoration: none;
    }
    .topbar-nav a:hover { color: var(--warp-bright); }

    body:not(.is-home) { padding-top: 0; }
    @media (min-width: 768px) { body:not(.is-home) main { padding-top: 36px; } }

    .star-field-fallback.is-visible { display: block; opacity: 0.5; }

    /* ---- ARTICLE ---- */
    .article {
      max-width: 46rem;          /* ~68ch at this size: a comfortable measure */
      margin: 0 auto;
      padding: 2.5rem 1.25rem 4rem;
    }

    .article-head { margin-bottom: 2rem; }

    .article-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.65rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--text-dim);
      margin-bottom: 0.9rem;
    }
    .article-meta i { margin-right: 0.35rem; color: var(--amber); }

    .article-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: clamp(1.75rem, 6vw, 2.75rem);
      font-weight: 700;
      line-height: 1.1;
      color: var(--text-bright);
      margin-bottom: 0.85rem;
    }

    .article-lede {
      font-size: 1.05rem;
      color: var(--text);
      line-height: 1.65;
    }

    .article-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.25rem; }

    .tag-chip {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.25rem 0.6rem;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--surface);
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.62rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--text-dim);
      text-decoration: none;
      transition: all var(--transition);
    }
    .tag-chip:hover {
      color: var(--warp-bright);
      border-color: var(--border-bright);
      background: var(--panel-hover);
    }
    .tag-count { color: var(--text-muted); }

    .tag-cloud { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }

    /* ---- ARCHIVE NOTICE ---- */
    .archive-note {
      display: flex;
      gap: 0.85rem;
      align-items: flex-start;
      padding: 0.9rem 1.1rem;
      margin-bottom: 2rem;
      border: 1px solid oklch(0.58 0.12 70 / 0.35);
      border-left: 2px solid var(--amber);
      border-radius: var(--radius);
      background: oklch(0.58 0.12 70 / 0.07);
      font-size: 0.85rem;
      color: var(--text);
    }
    .archive-note i { color: var(--amber); margin-top: 0.2rem; }
    .archive-note strong { color: var(--amber); }
    .archive-note a { color: var(--warp-bright); }

    /* ---- PROSE ---- */
    .prose { font-size: 1rem; line-height: 1.75; color: var(--text); }
    .prose > * + * { margin-top: 1.15rem; }

    .prose h1, .prose h2, .prose h3, .prose h4 {
      font-family: 'Space Grotesk', sans-serif;
      color: var(--text-bright);
      line-height: 1.25;
      margin-top: 2.5rem;
      margin-bottom: 0.65rem;
    }
    .prose h1 { font-size: 1.75rem; }
    .prose h2 {
      font-size: 1.4rem;
      padding-bottom: 0.4rem;
      border-bottom: 1px solid var(--border);
    }
    .prose h3 { font-size: 1.12rem; }
    .prose h4 { font-size: 1rem; color: var(--text); }

    .prose a { color: var(--warp-bright); text-decoration: underline; text-underline-offset: 0.2em; }
    .prose a:hover { color: var(--warp-streak); }

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

    .prose ul, .prose ol { padding-left: 1.4rem; }
    .prose li + li { margin-top: 0.4rem; }
    .prose li::marker { color: var(--warp-blue); }

    .prose blockquote {
      padding: 0.25rem 0 0.25rem 1.1rem;
      border-left: 2px solid var(--warp-blue);
      color: var(--text-dim);
      font-style: italic;
    }

    .prose img, .prose video {
      max-width: 100%;
      height: auto;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--void-deep);
    }

    .prose code {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.85em;
      padding: 0.12em 0.36em;
      border-radius: 3px;
      background: var(--surface-solid);
      border: 1px solid var(--border);
      color: var(--warp-streak);
    }

    .prose pre {
      overflow-x: auto;
      padding: 1rem 1.1rem;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--void-deep) !important;
      font-size: 0.82rem;
      line-height: 1.6;
    }
    .prose pre code {
      padding: 0;
      border: 0;
      background: none;
      color: inherit;
      font-size: inherit;
    }

    .prose table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.88rem;
    }
    .table-scroll, .prose > table { display: block; overflow-x: auto; }
    .prose th, .prose td {
      padding: 0.55rem 0.75rem;
      border: 1px solid var(--border);
      text-align: left;
    }
    .prose th {
      background: var(--surface-solid);
      color: var(--text-bright);
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.68rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .prose hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }

    .prose sup a { text-decoration: none; }
    .prose .footnote-definition { font-size: 0.85rem; color: var(--text-dim); }

    .mermaid-wrap { overflow-x: auto; padding: 0.5rem 0; }
    .mermaid-wrap pre.mermaid { background: none; border: 0; padding: 0; }

    .video-embed {
      position: relative;
      padding-bottom: 56.25%;
      height: 0;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .video-embed iframe {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      border: 0;
    }

    .article-foot { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }

    .comments { margin-top: 3rem; }
    .comments-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 1.15rem;
      color: var(--text-bright);
      margin-bottom: 1rem;
    }

    /* ---- LISTINGS ---- */
    .section-prose { max-width: 46rem; margin-bottom: 2rem; }

    .entry-list { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; gap: 0.85rem; }

    .entry-link {
      display: block;
      padding: 1.15rem 1.25rem;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--panel);
      text-decoration: none;
      transition: all var(--transition);
    }
    .entry-link:hover {
      border-color: var(--border-bright);
      background: var(--panel-hover);
      transform: translateY(-2px);
    }

    .entry-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 0.9rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.62rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--text-dim);
      margin-bottom: 0.5rem;
    }

    .entry-flag { color: var(--amber); }

    .entry-title {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 1.15rem;
      font-weight: 600;
      color: var(--text-bright);
      line-height: 1.3;
      margin-bottom: 0.4rem;
    }

    .entry-desc { font-size: 0.88rem; color: var(--text); line-height: 1.6; }

    .entry-more {
      display: inline-block;
      margin-top: 0.7rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.62rem;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--warp-bright);
    }
    .entry-more i { transition: transform var(--transition); }
    .entry-link:hover .entry-more i { transform: translateX(3px); }

    .archive-block { margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--border); }

    .archive-heading {
      font-family: 'Space Grotesk', sans-serif;
      font-size: 1.1rem;
      color: var(--text-dim);
      margin-bottom: 0.4rem;
    }
    .archive-heading i { color: var(--amber); margin-right: 0.4rem; }

    .archive-intro { font-size: 0.85rem; color: var(--text-dim); max-width: 46rem; }

    .entry-list.is-archive .entry-link { background: transparent; padding: 0.85rem 1rem; }
    .entry-list.is-archive .entry-title { font-size: 1rem; color: var(--text); }

    @media (min-width: 768px) {
      .entry-list { grid-template-columns: 1fr 1fr; }
      .entry-list.is-archive { grid-template-columns: 1fr 1fr 1fr; }
    }

    /* ---- CLICKABLE ARCHITECTURE NODES ----
       Each node in the homepage diagram links to the section that explains
       it. Without a visible affordance a link inside an SVG is invisible,
       so the box lifts and brightens on hover and focus. */
    .arch-node { cursor: pointer; }

    .arch-node rect,
    .arch-node text {
      transition: opacity 0.18s var(--ease-out), filter 0.18s var(--ease-out);
    }

    .arch-node:hover rect,
    .arch-node:focus-visible rect {
      filter: brightness(1.5);
    }
    .arch-node:hover text,
    .arch-node:focus-visible text {
      filter: brightness(1.25);
    }

    /* Keyboard focus must be obvious; the default outline is clipped by the
       SVG viewport on edge nodes, so draw it inside the shape instead. */
    .arch-node:focus { outline: none; }
    .arch-node:focus-visible rect {
      stroke: var(--warp-streak);
      stroke-width: 2.5;
    }

    @media (prefers-reduced-motion: reduce) {
      .arch-node rect, .arch-node text { transition: none; }
    }

    /* Touch targets: the whole group is already the hit area, but make sure
       the transparent interior counts, not just the stroke. */
    .arch-node rect { pointer-events: all; }

    /* Mermaid diagrams are wider than the reading measure. Let them use the
       full column and scroll rather than shrink their labels to illegibility. */
    .mermaid-wrap {
      overflow-x: auto;
      overflow-y: hidden;
      padding: 0.75rem 0;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--void-deep);
    }
    .mermaid-wrap pre.mermaid {
      background: none;
      border: 0;
      padding: 0 0.75rem;
      margin: 0;
      min-width: min-content;
    }
    .mermaid-wrap svg { display: block; margin: 0 auto; }

    /* Diagrams and wide media may exceed the 46rem measure on roomy screens. */
    @media (min-width: 1100px) {
      .prose .mermaid-wrap,
      .prose > p > img { width: min(64rem, calc(100vw - 4rem)); margin-left: calc((46rem - min(64rem, 100vw - 4rem)) / 2); }
    }

    /* ============================================================
       SEARCH
       Pagefind-backed. The modal is inert until opened, and nothing
       is fetched until the first keystroke.
       ============================================================ */

    .nav-search {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.15rem 0.45rem;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--surface);
      color: var(--text-dim);
      font: inherit;
      font-size: 0.7rem;
      cursor: pointer;
      transition: all var(--transition);
    }
    .nav-search:hover,
    .nav-search:focus-visible {
      color: var(--warp-bright);
      border-color: var(--border-bright);
      background: var(--panel-hover);
    }
    .nav-search-key {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.6rem;
      color: var(--text-muted);
    }
    .topbar .nav-search { padding: 0.2rem 0.5rem; }

    /* A class selector beats the UA's `[hidden] { display: none }`, so the
       modal would otherwise sit open on every page load. */
    .search-modal[hidden] { display: none; }

    .search-modal {
      position: fixed;
      inset: 0;
      z-index: 200;
      display: flex;
      justify-content: center;
      align-items: flex-start;
      padding: 4rem 1rem 2rem;
      background: oklch(0.04 0.02 260 / 0.82);
      backdrop-filter: blur(6px);
      overscroll-behavior: contain;
    }

    .search-panel {
      width: min(46rem, 100%);
      max-height: 100%;
      display: flex;
      flex-direction: column;
      border: 1px solid var(--border-bright);
      border-radius: var(--radius-lg);
      background: var(--surface-solid);
      box-shadow: 0 24px 80px oklch(0.02 0.02 260 / 0.7);
      overflow: hidden;
    }

    .search-field {
      display: flex;
      align-items: center;
      gap: 0.7rem;
      padding: 0.85rem 1rem;
      border-bottom: 1px solid var(--border);
    }
    .search-field > i { color: var(--warp-bright); }

    #search-input {
      flex: 1;
      min-width: 0;
      border: 0;
      background: none;
      color: var(--text-bright);
      font-family: 'Onest', system-ui, sans-serif;
      font-size: 1rem;
    }
    #search-input:focus { outline: none; }
    #search-input::placeholder { color: var(--text-muted); }
    #search-input::-webkit-search-cancel-button { filter: invert(0.6); }

    .search-close {
      padding: 0.2rem 0.45rem;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: none;
      color: var(--text-dim);
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.62rem;
      letter-spacing: 0.08em;
      cursor: pointer;
    }
    .search-close:hover { color: var(--warp-bright); border-color: var(--border-bright); }

    .search-status {
      padding: 0.55rem 1rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.62rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--text-dim);
      border-bottom: 1px solid var(--border);
    }

    .search-results {
      list-style: none;
      margin: 0;
      padding: 0.35rem;
      overflow-y: auto;
    }

    .search-result-link {
      display: block;
      padding: 0.7rem 0.75rem;
      border-radius: var(--radius);
      color: inherit;
      text-decoration: none;
    }
    .search-result-link:hover,
    .search-result-link:focus-visible {
      background: var(--panel-hover);
      outline: none;
    }

    .search-result-title {
      display: block;
      font-family: 'Space Grotesk', sans-serif;
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-bright);
      margin-bottom: 0.2rem;
    }

    .search-result-excerpt {
      font-size: 0.82rem;
      line-height: 1.55;
      color: var(--text);
      margin-bottom: 0.25rem;
    }
    /* Pagefind wraps matched terms in <mark>. */
    .search-result-excerpt mark {
      background: oklch(0.72 0.16 70 / 0.22);
      color: var(--amber);
      border-radius: 2px;
      padding: 0 0.15em;
    }

    .search-result-url {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.6rem;
      letter-spacing: 0.06em;
      color: var(--text-muted);
    }

    @media (max-width: 640px) {
      .search-modal { padding: 1rem 0.75rem; }
      .nav-search-key { display: none; }
    }