:root {
  --ink: #11141b;
  --muted: #5d6573;
  --line: #dce1e9;
  --line-strong: #c8cfda;
  --surface: #ffffff;
  --surface-alt: #f6f8fb;
  --blue: #075cf6;
  --blue-dark: #0348c9;
  --blue-soft: #edf3ff;
  --coral: #f04438;
  --code: #151c29;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--surface); font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.72; letter-spacing: 0; }
a { color: inherit; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.skip-link { position: fixed; top: -60px; left: 12px; z-index: 100; padding: 9px 13px; color: #111; background: #fff; border-radius: 4px; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 30; height: 64px; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); }
.header-inner { width: min(calc(100% - 36px), 1260px); height: 100%; display: flex; align-items: center; gap: 28px; margin: 0 auto; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; text-decoration: none; white-space: nowrap; }
.brand img { width: 29px; height: 29px; border-radius: 5px; }
.site-header nav { display: flex; gap: 28px; margin-left: auto; }
.site-header nav a { color: #3f4652; font-size: 14px; text-decoration: none; }
.site-header nav a:hover { color: var(--blue); }
.header-cta { min-height: 39px; display: inline-flex; align-items: center; gap: 8px; padding: 7px 15px; color: #fff; background: var(--blue); border-radius: 5px; font-size: 14px; font-weight: 750; text-decoration: none; }
.header-cta:hover { background: var(--blue-dark); }
.hero { padding: 72px max(20px, calc((100% - var(--max)) / 2)) 66px; background: #fbfcfe; border-bottom: 1px solid var(--line); }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 24px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { color: var(--blue); text-decoration: none; }
.eyebrow { margin: 0 0 10px; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.hero h1 { max-width: 880px; margin: 0; font-size: clamp(38px, 5vw, 58px); line-height: 1.16; letter-spacing: 0; }
.hero-lead { max-width: 790px; margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 28px; }
.button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 9px 18px; border: 1px solid transparent; border-radius: 6px; font-weight: 750; text-decoration: none; }
.button.primary { color: #fff; background: var(--blue); }
.button.primary:hover { background: var(--blue-dark); }
.button.secondary { color: #303744; background: #fff; border-color: var(--line-strong); }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 900px; margin: 42px 0 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.hero-facts div { padding: 19px 22px; border-right: 1px solid var(--line); }
.hero-facts div:last-child { border-right: 0; }
.hero-facts strong { display: block; font-size: 17px; }
.hero-facts span { color: var(--muted); font-size: 13px; }
.section { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; padding: 76px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-heading { max-width: 740px; margin-bottom: 34px; }
.section-heading h2 { margin: 0; font-size: clamp(28px, 4vw, 40px); line-height: 1.25; letter-spacing: 0; }
.section-heading p { margin: 12px 0 0; color: var(--muted); }
.step-list { border-top: 1px solid var(--line); }
.step { display: grid; grid-template-columns: 64px 1fr; gap: 22px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.step-number { color: var(--coral); font: 700 14px ui-monospace, monospace; }
.step h3 { margin: 0 0 6px; font-size: 20px; }
.step p { margin: 0; color: var(--muted); }
.code-block { overflow: hidden; color: #dfe8f2; background: var(--code); border-radius: 7px; }
.code-label { display: flex; justify-content: space-between; padding: 13px 18px; color: #9facba; border-bottom: 1px solid rgba(255,255,255,.1); font-size: 12px; }
.code-block pre { margin: 0; padding: 24px; overflow-x: auto; font-size: 13px; line-height: 1.75; }
.parameter-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.parameter-table th, .parameter-table td { padding: 15px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.parameter-table th { color: #343b47; background: var(--surface-alt); }
.parameter-table td { color: var(--muted); }
.parameter-table code { color: var(--blue); }
.check-grid { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.check-item { min-height: 150px; padding: 25px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.check-item i { color: var(--blue); font-size: 20px; }
.check-item h3 { margin: 16px 0 6px; font-size: 17px; }
.check-item p { margin: 0; color: var(--muted); font-size: 14px; }
.related { background: var(--surface-alt); }
.related-inner { width: min(calc(100% - 40px), var(--max)); display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 0 auto; padding: 66px 0; border-top: 1px solid var(--line); }
.related a { display: block; padding: 26px; background: #fff; border: 1px solid var(--line); text-decoration: none; }
.related a + a { border-left: 0; }
.related small { color: var(--coral); font-weight: 750; }
.related strong { display: block; margin-top: 8px; font-size: 20px; }
.related span { display: block; margin-top: 6px; color: var(--muted); font-size: 14px; }
.final-cta { padding: 62px max(20px, calc((100% - var(--max)) / 2)); color: #fff; background: #10224a; }
.final-cta h2 { max-width: 760px; margin: 0; font-size: clamp(29px, 4vw, 42px); line-height: 1.25; letter-spacing: 0; }
.final-cta p { color: rgba(255,255,255,.72); }
.final-cta .button { margin-top: 10px; color: var(--blue-dark); background: #fff; }
footer { width: min(calc(100% - 40px), var(--max)); display: flex; justify-content: space-between; gap: 30px; margin: 0 auto; padding: 38px 0; color: var(--muted); font-size: 13px; }
footer a { color: var(--blue); text-decoration: none; }

@media (max-width: 760px) {
  .site-header nav { display: none; }
  .header-cta { margin-left: auto; font-size: 12px; }
  .hero { padding-top: 48px; }
  .hero-lead { font-size: 16px; }
  .hero-facts { grid-template-columns: 1fr; }
  .hero-facts div { border-right: 0; border-bottom: 1px solid var(--line); }
  .hero-facts div:last-child { border-bottom: 0; }
  .section { padding: 60px 0; }
  .step { grid-template-columns: 42px 1fr; gap: 14px; }
  .check-grid, .related-inner { grid-template-columns: 1fr; }
  .related a + a { border-top: 0; border-left: 1px solid var(--line); }
  .parameter-table { display: block; overflow-x: auto; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}