:root {
  --bg: #0e1116;
  --panel: #161b22;
  --line: #262d38;
  --ink: #e8edf4;
  --dim: #97a3b6;
  --accent: #4cc2ff;
  --ok: #4ade80;
  --radius: 12px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fb;
    --panel: #ffffff;
    --line: #e2e8f0;
    --ink: #131920;
    --dim: #5b6678;
    --accent: #0b7fc4;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1.1rem, 4vw, 2rem) 3rem;
}

/* ---------- header ---------- */

.mark {
  width: 46px;
  height: 46px;
  margin-bottom: 1.4rem;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #7c5cff);
  box-shadow: 0 6px 22px -8px var(--accent);
}

.eyebrow {
  margin: 0 0 .5rem;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .11em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0 0 .7rem;
  font-size: clamp(1.9rem, 5.5vw, 2.9rem);
  line-height: 1.15;
  letter-spacing: -.02em;
}

.lede {
  margin: 0;
  max-width: 54ch;
  font-size: clamp(1rem, 2.4vw, 1.1rem);
  color: var(--dim);
}

.lede strong { color: var(--ink); }

/* ---------- chain ---------- */

.panel {
  margin: clamp(2rem, 5vw, 3rem) 0;
  padding: clamp(1.2rem, 3.5vw, 1.8rem);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.panel h2 {
  margin: 0 0 1.1rem;
  font-size: .95rem;
  font-weight: 600;
  color: var(--dim);
}

.chain {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.chain li {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .75rem;
  align-items: baseline;
  padding: .7rem 0 .7rem 2.1rem;
  border-top: 1px solid var(--line);
  position: relative;
  counter-increment: step;
}

.chain li:first-child { border-top: 0; }

.chain li::before {
  content: "";
  position: absolute;
  left: .35rem;
  top: 1.15rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent);
}

.chain span { flex: 1 1 auto; }

.chain code,
.card code,
.foot code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .84em;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: .12em .45em;
  border-radius: 5px;
  overflow-wrap: anywhere;
}

/* ---------- cards ---------- */

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  padding: 1.2rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.card h3 {
  margin: 0 0 .45rem;
  font-size: 1rem;
}

.card p {
  margin: 0;
  font-size: .92rem;
  color: var(--dim);
}

/* ---------- footer ---------- */

.foot {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  font-size: .85rem;
  color: var(--dim);
}

.foot p { margin: .2rem 0; }

.muted { opacity: .72; }

@media (prefers-reduced-motion: no-preference) {
  .wrap > * {
    animation: rise .5s cubic-bezier(.2, .7, .3, 1) backwards;
  }
  .panel  { animation-delay: .06s; }
  .grid   { animation-delay: .12s; }
  .foot   { animation-delay: .18s; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: none; }
  }
}