:root {
    --navy: #12203c;
    --navy-deep: #0c1729;
    --panel: #182b4d;
    --panel-line: rgba(255,255,255,0.09);
    --paper: #f4f1e8;
    --orange: #ff6a3d;
    --orange-dim: #d9542c;
    --teal: #5fd8cc;
    --teal-dim: #3ba89d;
    --ink: #eef1f6;
    --ink-dim: #aab6cc;
    --royal-blue: #2952E3;
    --indigo: #4b0082;
    --indigo-dark: #2e004f;
    --mono: 'IBM Plex Mono', monospace;
    --display: 'Space Grotesk', sans-serif;
    --body: 'Inter', sans-serif;
  }

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

  html { scroll-behavior: smooth; }

  body {
    background: var(--indigo);
    color: var(--ink);
    font-family: var(--body);
    line-height: 1.55;
    background-image:
      repeating-linear-gradient(0deg, var(--panel-line) 0, var(--panel-line) 1px, transparent 1px, transparent 48px),
      repeating-linear-gradient(90deg, var(--panel-line) 0, var(--panel-line) 1px, transparent 1px, transparent 48px);
  }

  .wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 28px;
  }

  /* ---------- Top bar ---------- */
  header.top {
    padding: 24px 0 0;
  }
  .top .wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .brand {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.12em;
    color: var(--teal);
    text-transform: uppercase;
  }
  .brand span { color: var(--ink-dim); }
  .back-link {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink-dim);
    text-decoration: none;
    border-bottom: 1px dashed var(--ink-dim);
    padding-bottom: 2px;
    transition: color 0.2s, border-color 0.2s;
  }
  .back-link:hover { color: var(--orange); border-color: var(--orange); }

  /* ---------- Hero ---------- */
  .hero {
    padding: 72px 0 90px;
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 40px;
    align-items: center;
    max-width: 1200px;
    margin: auto;
  }
  .eyebrow {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--orange);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 22px;
  }
  .eyebrow::before {
    content: "";
    width: 22px;
    height: 1px;
    background: var(--orange);
    display: inline-block;
  }
  h1 {
    font-family: var(--display);
    font-weight: 700;
    font-size: clamp(38px, 5.2vw, 62px);
    line-height: 1.06;
    letter-spacing: -0.01em;
    color: var(--paper);
  }
  h1 em {
    font-style: normal;
    color: var(--teal);
    text-decoration: underline;
    text-decoration-color: var(--orange-dim);
    text-decoration-thickness: 3px;
    text-underline-offset: 6px;
  }
  .hero p.lede {
    margin-top: 22px;
    font-size: 18px;
    color: var(--ink-dim);
    max-width: 46ch;
  }
  .cta-row {
    margin-top: 34px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: center;
  }
  .btn {
    font-family: var(--body);
    font-weight: 600;
    font-size: 15px;
    padding: 14px 26px;
    border-radius: 3px;
    text-decoration: none;
    display: inline-block;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
  }
  .btn:focus-visible, a:focus-visible, button:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 3px;
  }
  .btn-primary {
    background: var(--orange);
    color: var(--navy-deep);
    box-shadow: 0 0 0 1px var(--orange-dim);
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 0 0 var(--orange-dim); }
  .btn-ghost {
    color: var(--ink);
    border: 1px solid var(--panel-line);
    background: transparent;
  }
  .btn-ghost:hover { border-color: var(--teal); color: var(--teal); }

  /* ---------- Exploded diagram (signature element) ---------- */
  .diagram-frame {
    position: relative;
    border: 1px solid var(--panel-line);
    background: var(--indigo-dark);
    border-radius: 4px;
    padding: 18px;
  }
  .diagram-frame::before {
    content: "FIG. 1 — SCLPAK, DISASSEMBLED";
    position: absolute;
    top: -11px;
    left: 16px;
    background: black; /* var(--navy); */
    padding: 0 8px;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--ink-dim);
  }
  .diagram-frame svg { width: 100%; height: auto; display: block; }

  /* ---------- How it works ---------- */
  section.how {
    padding: 40px 0 90px;
    border-top: 1px solid var(--panel-line);
  }
  .section-head {
    margin-bottom: 44px;
    max-width: 60ch;
  }
  h2 {
    font-family: var(--display);
    font-weight: 600;
    font-size: clamp(26px, 3.2vw, 34px);
    color: var(--paper);
    margin-top: 10px;
  }
  .steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    position: relative;
  }
  .step {
    padding: 0 26px 0 0;
    position: relative;
  }
  .step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 10px;
    right: 0;
    bottom: 10px;
    width: 0;
    border-right: 1px dashed var(--panel-line);
  }
  .step-tag {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--teal);
    border: 1px solid var(--teal-dim);
    display: inline-block;
    padding: 3px 9px;
    border-radius: 2px;
    margin-bottom: 16px;
  }
  .step h3 {
    font-family: var(--display);
    font-size: 20px;
    font-weight: 600;
    color: var(--paper);
    margin-bottom: 10px;
  }
  .step p {
    color: var(--ink-dim);
    font-size: 15px;
    max-width: 32ch;
  }

  /* ---------- Demo band ---------- */
  section.demo {
    padding: 60px 0;
  }
  .demo-panel {
    border: 1px solid var(--panel-line);
    background: var(--indigo-dark);
    border-radius: 4px;
    padding: 44px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
  }
  .demo-panel h3 {
    font-family: var(--display);
    font-size: 24px;
    color: var(--paper);
    margin-bottom: 8px;
  }
  .demo-panel p { color: var(--ink-dim); max-width: 42ch; }

  /* ---------- Why remix ---------- */
  section.why {
    padding: 20px 0 90px;
    border-top: 1px solid var(--panel-line);
  }
  .why-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .why-card {
    background: var(--indigo-dark);
    border: 1px solid var(--panel-line);
    border-radius: 4px;
    padding: 26px 28px;
  }
  .why-card .mark {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--orange);
    letter-spacing: 0.1em;
  }
  .why-card h3 {
    font-family: var(--display);
    font-size: 18px;
    font-weight: 600;
    color: var(--paper);
    margin: 10px 0 8px;
  }
  .why-card p {
    color: var(--ink-dim);
    font-size: 15px;
  }

  /* ---------- Closing CTA ---------- */
  section.closing {
    padding: 60px 0 100px;
    text-align: center;
  }
  section.closing h2 { margin: 0 auto 14px; }
  section.closing p.lede {
    color: var(--ink-dim);
    max-width: 50ch;
    margin: 0 auto 30px;
  }
  section.closing .cta-row { justify-content: center; }

  footer {
    border-top: 1px solid var(--panel-line);
    padding: 26px 0 40px;
  }
  footer .wrap {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink-dim);
    display: flex;
    justify-content: space-between;
  }

  @media (max-width: 760px) {
    .hero { grid-template-columns: 1fr; padding-top: 44px; }
    .steps { grid-template-columns: 1fr; gap: 34px; }
    .step:not(:last-child)::after { display: none; }
    .why-grid { grid-template-columns: 1fr; }
    .demo-panel { flex-direction: column; align-items: flex-start; text-align: left; }
  }

  @media (prefers-reduced-motion: reduce) {
    * { transition: none !important; }
  }