:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #171a21;
  --muted: #5b6372;
  --line: #e2e5ee;
  --accent: #4f46e5;
  --accent-ink: #ffffff;
  --accent-soft: #eceafd;
  --code: #eef0f6;
  --callout: #fff6dc;
  --callout-line: #f0d98a;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 8px 24px rgba(20, 24, 40, .06);
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1116;
    --surface: #181b23;
    --text: #eceef4;
    --muted: #a0a8b8;
    --line: #2a2f3b;
    --accent: #8b85ff;
    --accent-ink: #0d0e18;
    --accent-soft: #23223f;
    --code: #232734;
    --callout: #2c2711;
    --callout-line: #5a4d1c;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 22px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; z-index: 20; }
.skip:focus { left: 8px; }

/* header */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; text-decoration: none; letter-spacing: -.01em; }
.brand svg { color: var(--accent); }
.top nav { display: flex; gap: 4px; }
.top nav a { color: var(--muted); text-decoration: none; padding: 8px 12px; border-radius: 8px; font-size: 15px; }
.top nav a:hover { color: var(--text); background: var(--accent-soft); }

/* hero */
.hero { padding: 72px 0 40px; background: radial-gradient(900px 340px at 50% -80px, var(--accent-soft), transparent 70%); }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-weight: 650; font-size: 14px; letter-spacing: .06em; text-transform: uppercase; }
.hero h1 { margin: 0 0 16px; font-size: clamp(34px, 6vw, 58px); line-height: 1.08; letter-spacing: -.03em; max-width: 14ch; }
.lead { margin: 0 0 28px; font-size: clamp(17px, 2.2vw, 20px); color: var(--muted); max-width: 60ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 0; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 12px 20px; border-radius: 11px; border: 1px solid var(--line);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.btn:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.ghost { background: transparent; }
.btn.wide { width: 100%; }

/* sections */
.section { padding: 48px 22px; }
.section h2 { margin: 0 0 6px; font-size: 30px; letter-spacing: -.02em; }
.sub { margin: 0 0 26px; color: var(--muted); }

/* download cards */
.cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.card { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.card.highlight { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow); }
.card h3 { margin: 4px 0 4px; font-size: 21px; letter-spacing: -.01em; }
.card p { margin: 0 0 12px; }
.card .meta { color: var(--muted); font-size: 14px; }
.card .btn { margin-top: auto; }
.fine { margin: 12px 0 0 !important; font-size: 13.5px; color: var(--muted); }
.badge { align-self: flex-start; background: var(--accent); color: var(--accent-ink); font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; margin-bottom: 8px; }
.badge.quiet { background: var(--code); color: var(--muted); }
.notice { background: var(--accent-soft); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin-bottom: 18px; }
.status { margin: 16px 0 0; padding: 12px 16px; border-radius: 12px; background: var(--accent-soft); font-weight: 600; }

/* steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.steps > li { display: grid; grid-template-columns: 44px 1fr; gap: 18px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.num { width: 44px; height: 44px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-weight: 800; font-size: 19px; display: grid; place-items: center; }
.steps h3 { margin: 6px 0 8px; font-size: 20px; letter-spacing: -.01em; }
.steps p { margin: 0 0 12px; }
.body { min-width: 0; }
.callout { background: var(--callout); border: 1px solid var(--callout-line); border-radius: 12px; padding: 14px 18px; margin-top: 6px; }
.callout ol { margin: 8px 0; padding-left: 22px; }
code, kbd { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .9em; background: var(--code); border-radius: 6px; padding: 2px 6px; }
kbd { border: 1px solid var(--line); border-bottom-width: 2px; }

/* settings mock-up */
.mock { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin: 4px 0 18px; max-width: 520px; box-shadow: var(--shadow); }
.mock-title { font-weight: 700; margin-bottom: 4px; }
.mock-note { color: var(--muted); font-size: 13px; margin-bottom: 12px; }
.mock-field { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; margin-bottom: 8px; font-size: 14px; overflow-wrap: anywhere; }
.mock-field.dots { letter-spacing: 2px; color: var(--muted); }
.mock-buttons { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; font-size: 13px; }
.mock-buttons span { border: 1px solid var(--line); border-radius: 7px; padding: 4px 16px; }
.mock-buttons .ok { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }

.fields { margin: 0 0 14px; }
.fields dt { font-weight: 700; margin-top: 12px; }
.fields dd { margin: 2px 0 0; }
.copyrow { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 6px 0; }
.copyrow code { font-size: 15px; padding: 6px 10px; overflow-wrap: anywhere; }
.copy { font: inherit; font-size: 14px; font-weight: 600; padding: 6px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--text); cursor: pointer; }
.copy:hover { border-color: var(--accent); }

/* good to know */
.know { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.know > div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.know h3 { margin: 0 0 8px; font-size: 17px; }
.know p { margin: 0; color: var(--muted); }

/* faq */
.faq { display: grid; gap: 10px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 0 18px; }
.faq summary { cursor: pointer; padding: 15px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 22px; line-height: 1; color: var(--accent); }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin: 0 0 16px; color: var(--muted); }

.own { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; }
.own ol { margin: 0 0 12px; padding-left: 22px; }
.own li { margin: 6px 0; }

.foot { border-top: 1px solid var(--line); padding: 28px 0 44px; color: var(--muted); font-size: 14px; }
.foot p { margin: 0 0 8px; max-width: 80ch; }

@media (max-width: 640px) {
  .top nav a:not(:first-child) { display: none; }
  .hero { padding-top: 44px; }
  .steps > li { grid-template-columns: 1fr; gap: 10px; padding: 18px; }
  .num { width: 36px; height: 36px; font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}