:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --ink: #0f1c2e;
  --ink-soft: #4a5668;
  --line: #e2e6ec;
  --accent: #0e7c66;
  --accent-ink: #ffffff;
  --accent-soft: #e3f3ef;
  --code: #eef1f5;
  --radius: 14px;
  --max: 1120px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111a2b;
    --ink: #e8edf5;
    --ink-soft: #a3aec0;
    --line: #223049;
    --accent: #34c7a4;
    --accent-ink: #06231c;
    --accent-soft: #12332d;
    --code: #16223a;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img, svg { max-width: 100%; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: var(--surface); padding: 8px 12px; z-index: 10; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em; }
.brand svg { width: 32px; height: 32px; flex: none; }
.brand small { font-weight: 500; color: var(--ink-soft); }
.nav { display: flex; gap: 4px 18px; flex-wrap: wrap; font-size: 15px; }
.nav a { color: var(--ink-soft); text-decoration: none; padding: 6px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 10px;
  font-weight: 600; font-size: 16px; text-decoration: none;
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn-ghost:hover { border-color: var(--ink-soft); }

/* Hero */
.hero { padding: 88px 0 72px; }
.eyebrow { display: inline-block; font: 600 13px/1 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.hero h1 { font-size: clamp(34px, 5.4vw, 58px); line-height: 1.08; letter-spacing: -0.03em; margin: 0 0 20px; max-width: 16ch; }
.hero p.lead { font-size: clamp(18px, 2vw, 21px); color: var(--ink-soft); max-width: 60ch; margin: 0 0 32px; }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* Sections */
section { padding: 72px 0; }
section + section { border-top: 1px solid var(--line); }
.section-head { max-width: 680px; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 36px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 12px; }
.section-head p { color: var(--ink-soft); margin: 0; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.card h3 { margin: 14px 0 8px; font-size: 19px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--ink-soft); font-size: 16px; }
.icon { width: 42px; height: 42px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; }
.icon svg { width: 22px; height: 22px; }

.steps { counter-reset: step; display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); padding: 0; margin: 0; list-style: none; }
.steps li { counter-increment: step; border-top: 2px solid var(--accent); padding-top: 18px; }
.steps li::before { content: "0" counter(step); font: 600 14px var(--mono); color: var(--accent); }
.steps h3 { margin: 6px 0 6px; font-size: 18px; }
.steps p { margin: 0; color: var(--ink-soft); font-size: 16px; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.tags li { font: 500 14px var(--mono); background: var(--code); border: 1px solid var(--line); padding: 6px 12px; border-radius: 999px; }

.cta { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: clamp(28px, 5vw, 56px); display: flex; gap: 24px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.cta h2 { margin: 0 0 8px; font-size: clamp(24px, 3vw, 32px); letter-spacing: -0.02em; }
.cta p { margin: 0; color: var(--ink-soft); }

/* Legal / document pages */
.doc { padding: 56px 0 80px; }
.doc .wrap { max-width: 800px; }
.doc h1 { font-size: clamp(30px, 4.4vw, 42px); letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 8px; }
.doc .meta { color: var(--ink-soft); font-size: 15px; margin: 0 0 32px; }
.doc h2 { font-size: 22px; margin: 40px 0 10px; letter-spacing: -0.01em; }
.doc h3 { font-size: 18px; margin: 24px 0 6px; }
.doc p, .doc li { color: var(--ink); }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 4px 0; }
.doc .toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 24px; font-size: 15px; }
.doc .toc ol { margin: 8px 0 0; columns: 2 260px; }
.note { background: var(--accent-soft); border-left: 3px solid var(--accent); padding: 14px 18px; border-radius: 8px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { font-weight: 600; background: var(--code); }
code { font-family: var(--mono); font-size: 0.92em; background: var(--code); padding: 1px 6px; border-radius: 5px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0 48px; font-size: 15px; color: var(--ink-soft); }
.site-footer .wrap { display: flex; gap: 24px 48px; justify-content: space-between; flex-wrap: wrap; }
.site-footer nav { display: flex; gap: 8px 20px; flex-wrap: wrap; }
.site-footer a { color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero { padding: 56px 0 48px; }
  section { padding: 56px 0; }
  .brand small { display: none; }
}