:root {
  --bg: #0c0e13;
  --bg-soft: #11141c;
  --card: #161a24;
  --line: #232838;
  --ink: #e8ebf2;
  --muted: #99a2b3;
  --accent: #74b0ff;
  --accent-2: #6ee7c7;
  --accent-ink: #06101f;
  --code-bg: #0a0c11;
  --radius: 14px;
  --wrap: 920px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.7 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 6px;
  color: #cfd8e6;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
}
pre code { background: none; border: 0; padding: 0; color: #cfd8e6; }

/* Install substeps (a, b, c, …) */
.substep { margin: 26px 0 8px; padding-left: 14px; border-left: 2px solid var(--line); }
.substep strong { color: var(--accent-2); }

/* Example command output */
.out-label { color: var(--muted); font-size: 13px; margin: 12px 0 4px; }
pre.out { border-left: 3px solid var(--accent-2); }
pre.out code { color: var(--muted); }

.dot {
  display: inline-block;
  width: 9px; height: 9px;
  margin-right: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  vertical-align: middle;
}

/* Header / nav */
.site-head {
  position: sticky; top: 0; z-index: 10;
  background: rgba(12, 14, 19, 0.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { color: var(--ink); font-weight: 700; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.nav-links a { color: var(--muted); margin-left: 22px; font-size: 14.5px; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }

/* Hero */
.hero {
  padding: 13vh 0 9vh;
  background:
    radial-gradient(900px 420px at 70% -8%, rgba(116, 176, 255, 0.16), transparent 60%),
    radial-gradient(700px 360px at 8% 4%, rgba(110, 231, 199, 0.10), transparent 55%);
  border-bottom: 1px solid var(--line);
}
h1 {
  font-size: clamp(38px, 7vw, 66px);
  line-height: 1.03;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
}
.lede { font-size: clamp(17px, 2.3vw, 21px); color: var(--muted); max-width: 640px; margin: 0 0 26px; }
.lede em { color: var(--ink); font-style: normal; }
.tree { display: inline-block; max-width: 100%; }
.tree .g { color: var(--accent-2); }
.cta { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), #8ec0ff);
  color: var(--accent-ink);
  font-weight: 650;
  padding: 12px 22px;
  border-radius: 10px;
}
.btn:hover { filter: brightness(1.06); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }

/* Pillars */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  padding-top: 7vh;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* Sections */
.section { padding-top: 9vh; }
.section + .section { padding-top: 8vh; }
h2 { font-size: clamp(26px, 4vw, 34px); letter-spacing: -0.02em; margin: 0 0 6px; }
.section-lede { color: var(--muted); max-width: 640px; margin: 0 0 30px; font-size: 17px; }
h3.sub { margin: 34px 0 10px; font-size: 16px; color: var(--accent); letter-spacing: 0.01em; }

.muted { color: var(--muted); font-size: 14.5px; }

.callout {
  margin-top: 12px;
  background: linear-gradient(180deg, rgba(116,176,255,0.07), rgba(116,176,255,0.02));
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  padding: 16px 18px;
  color: var(--muted);
  font-size: 15px;
}
.callout strong { color: var(--ink); }

/* Protocol flow */
.flow { display: flex; flex-direction: column; gap: 14px; margin-top: 8px; }
.flow-step {
  display: flex; gap: 16px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}
.flow-step .n {
  flex: 0 0 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--card);
  border: 1px solid var(--line);
  color: var(--accent);
  font-weight: 700; font-size: 14px;
}
.flow-step strong { display: block; margin-bottom: 4px; }
.flow-step div { color: var(--muted); font-size: 15px; }
.call {
  display: inline-block;
  margin: 6px 0;
  color: var(--accent-2);
  background: var(--code-bg);
}

.bullets { padding-left: 20px; color: var(--muted); }
.bullets li { margin: 10px 0; }
.bullets strong { color: var(--ink); }

/* API table */
.api { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 15px; }
.api th, .api td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); }
.api th { color: var(--muted); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; }
.api td:first-child { white-space: nowrap; }
.api td { color: var(--muted); }

/* Footer */
.site-foot { border-top: 1px solid var(--line); margin-top: 10vh; padding: 5vh 0; }
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; justify-content: space-between; }
.site-foot span { font-size: 14px; }

@media (max-width: 560px) {
  .nav-links a { margin-left: 14px; }
}