:root {
  --blue: #1677ff; --blue2: #0958d9; --ink: #1f2329; --mute: #646a73; --line: #e5e6eb; --bg: #f7f8fa;
  --safe: env(safe-area-inset-bottom, 0px);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: "PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif; color: var(--ink); background: #fff; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.nav { position: sticky; top: 0; z-index: 20; background: #fff; border-bottom: 1px solid var(--line); }
.nav-in { height: 64px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; }
.logo { width: 32px; height: 32px; border-radius: 8px; overflow: hidden; }
.logo img { width: 100%; height: 100%; object-fit: cover; }
.links { display: flex; gap: 24px; color: var(--mute); font-size: 14px; }
.links a:hover { color: var(--blue); }
.btn { display: inline-flex; align-items: center; justify-content: center; height: 40px; padding: 0 18px; border-radius: 8px; font-size: 14px; font-weight: 600; border: 1px solid transparent; }
.btn.primary { background: var(--blue); color: #fff; }
.btn.line { background: #fff; border-color: var(--line); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
section { padding: 56px 0; }
.kicker { color: var(--blue); font-size: 13px; font-weight: 700; }
h1 { margin: 14px 0 12px; font-size: clamp(32px, 4.5vw, 42px); line-height: 1.25; }
h2 { margin: 28px 0 10px; font-size: 24px; }
.prose { color: var(--mute); font-size: 15px; line-height: 1.9; max-width: 820px; }
.prose + .prose { margin-top: 12px; }
.prose a, .list a { color: var(--blue); }
.list { margin: 12px 0 0 18px; color: var(--mute); font-size: 15px; line-height: 1.9; }
.crumbs { color: var(--mute); font-size: 13px; margin-bottom: 10px; }
.crumbs a { color: var(--blue); }
footer { padding: 8px 0 48px; color: #86909c; font-size: 13px; line-height: 1.8; }
footer a { color: #4e5969; margin-right: 14px; }
@media (max-width: 900px) { .links { display: none; } }