@font-face {
    font-family: 'Geist';
    src: url('fonts/GeistVF.woff2') format('woff2');
    font-weight: 100 900;
    font-display: swap;
  }
  @font-face {
    font-family: 'Geist Mono';
    src: url('fonts/GeistMonoVF.woff2') format('woff2');
    font-weight: 100 900;
    font-display: swap;
  }
  @font-face {
    font-family: 'GeistPixel';
    src: url('fonts/GeistPixel-Square.woff2') format('woff2');
    font-weight: 400;
    font-display: swap;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    font-family: 'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #0c0c1a;
    color: #a1a1aa;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  .serif {
    font-family: 'Fraunces', Georgia, serif;
    font-optical-sizing: auto;
  }

  .page { max-width: 880px; margin: 0 auto; padding: 0 28px; }

  /* ── Mark ── */
  .mark {
    padding: 28px 0;
    font-family: 'GeistPixel', monospace;
    font-size: 16px;
    font-weight: 400;
    color: #4a6faf;
    letter-spacing: 1px;
  }

  /* ── Hero ── */
  .hero {
    padding: 120px 0 100px;
    border-bottom: 1px solid #1a1a2e;
  }
  .hero h1 {
    font-family: 'Fraunces', Georgia, serif;
    font-optical-sizing: auto;
    font-size: clamp(38px, 6.5vw, 68px);
    font-weight: 300;
    line-height: 1.08;
    letter-spacing: -2px;
    color: #fafafa;
  }
  .hero h1 em {
    font-style: italic;
    font-weight: 300;
  }
  .hero-bottom {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: 48px;
    gap: 32px;
  }
  .hero-sub {
    font-size: 15px;
    color: #52525b;
    line-height: 1.6;
    max-width: 380px;
  }
  .btn {
    display: inline-block;
    padding: 12px 28px;
    background: #fafafa;
    color: #0c0c1a;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    border-radius: 100px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: opacity 0.15s;
    white-space: nowrap;
    letter-spacing: 0.2px;
    flex-shrink: 0;
  }
  .btn:hover { opacity: 0.8; }

  /* ── Section ── */
  .section {
    padding: 80px 0;
    border-bottom: 1px solid #1a1a2e;
  }
  .section-label {
    font-family: 'Geist Mono', monospace;
    font-size: 11px;
    font-weight: 500;
    color: #3f3f46;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 32px;
  }
  .section h2 {
    font-family: 'Fraunces', Georgia, serif;
    font-optical-sizing: auto;
    font-size: clamp(24px, 3.5vw, 34px);
    font-weight: 400;
    letter-spacing: -0.75px;
    line-height: 1.2;
    color: #fafafa;
    margin-bottom: 40px;
    max-width: 560px;
  }
  .section p {
    font-size: 15px;
    color: #71717a;
    line-height: 1.75;
    margin-bottom: 20px;
  }
  .section p strong { color: #d4d4d8; font-weight: 600; }

  /* ── Problem grid ── */
  .prob-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
  }
  .prob h4 {
    font-size: 14px;
    font-weight: 600;
    color: #d4d4d8;
    margin-bottom: 8px;
  }
  .prob p {
    font-size: 13.5px;
    color: #52525b;
    line-height: 1.65;
    margin: 0;
  }

  /* ── Diagram ── */
  .diagram {
    margin-top: 40px;
    border: 1px solid #1a1a2e;
    border-radius: 12px;
    overflow: hidden;
  }
  .d-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    border-bottom: 1px solid #1a1a2e;
  }
  .d-row:last-child { border-bottom: none; }
  .d-label {
    padding: 20px 24px;
    border-right: 1px solid #1a1a2e;
    display: flex;
    align-items: center;
  }
  .d-label span {
    font-family: 'Fraunces', Georgia, serif;
    font-size: 15px;
    font-weight: 400;
    color: #fafafa;
  }
  .d-content {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }
  .d-what {
    font-size: 13.5px;
    color: #71717a;
    line-height: 1.55;
  }
  .d-attrs {
    font-family: 'Geist Mono', monospace;
    font-size: 11px;
    color: #3f3f46;
    white-space: nowrap;
  }
  .d-bridge {
    font-family: 'Geist Mono', monospace;
    padding: 8px 24px;
    background: #10101e;
    border-bottom: 1px solid #1a1a2e;
    font-size: 11px;
    color: #3f3f46;
    letter-spacing: 0.5px;
    text-align: center;
  }

  /* ── Timeline ── */
  .timeline {
    margin-top: 36px;
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 0 16px;
  }
  .tl-line {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .tl-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1.5px solid #24243a;
    background: #0c0c1a;
    flex-shrink: 0;
    margin-top: 5px;
  }
  .tl-dot.on { background: #fafafa; border-color: #fafafa; }
  .tl-wire { width: 1px; flex: 1; background: #1a1a2e; }
  .tl-content { padding-bottom: 24px; }
  .tl-actor {
    font-family: 'Geist Mono', monospace;
    font-size: 11px;
    font-weight: 500;
    color: #3f3f46;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 4px;
  }
  .tl-text {
    font-size: 14px;
    color: #71717a;
    line-height: 1.6;
  }
  .tl-text.spoken {
    font-family: 'Fraunces', Georgia, serif;
    font-style: italic;
    font-weight: 300;
    font-size: 16px;
    color: #d4d4d8;
    line-height: 1.5;
  }

  /* ── Founder ── */
  .founder-text {
    font-size: 15px;
    color: #71717a;
    line-height: 1.75;
    max-width: 640px;
  }
  .founder-text strong { color: #d4d4d8; font-weight: 600; }

  /* ── CTA ── */
  .final-cta {
    padding: 80px 0 120px;
  }
  .final-cta h2 { margin-bottom: 12px; }
  .final-cta .sub {
    font-size: 14px;
    color: #3f3f46;
    margin-bottom: 32px;
  }
  .cta-link {
    font-size: 14px;
    color: #fafafa;
    text-decoration: none;
    border-bottom: 1px solid #3f3f46;
    padding-bottom: 2px;
    transition: border-color 0.15s;
  }
  .cta-link:hover { border-color: #fafafa; }

  footer {
    font-family: 'Geist Mono', monospace;
    padding: 24px 0;
    font-size: 11px;
    color: #24243a;
    border-top: 1px solid #1a1a2e;
    display: flex;
    justify-content: space-between;
  }
  .footer-brand {
    font-family: 'GeistPixel', monospace;
    font-size: 12px;
    letter-spacing: 0.8px;
  }

  /* ── Mobile ── */
  @media (max-width: 700px) {
    .hero { padding: 80px 0 64px; }
    .hero-bottom { flex-direction: column; align-items: flex-start; }
    .section { padding: 56px 0; }
    .prob-grid { grid-template-columns: 1fr; gap: 24px; }
    .d-row { grid-template-columns: 1fr; }
    .d-label { border-right: none; border-bottom: 1px solid #1a1a2e; padding: 14px 24px; }
    .d-content { flex-direction: column; align-items: flex-start; }
    .final-cta { padding: 56px 0 80px; }
  }