:root {
  --primary: #2F6BFF;
  --primary-dark: #1E4FD6;
  --primary-soft: #EAF1FF;
  --ink: #1A2233;
  --ink-soft: #5B667A;
  --ink-faint: #8A94A6;
  --bg: #F6F8FC;
  --surface: #FFFFFF;
  --line: rgba(26, 34, 51, 0.08);
  --radius: 20px;
  --shadow: 0 18px 50px rgba(31, 79, 214, 0.12);
  --shadow-sm: 0 8px 24px rgba(26, 34, 51, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(880px, 90vw); margin: 0 auto; }

/* Header */
header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  background: rgba(246, 248, 252, 0.82);
  border-bottom: 1px solid var(--line);
}
.nav {
  width: min(1120px, 90vw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; height: 66px;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 18px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: grid; place-items: center; color: #fff; font-size: 19px;
  box-shadow: 0 6px 16px rgba(47, 107, 255, 0.35);
}
.nav-back { font-size: 14px; color: var(--ink-soft); font-weight: 600; }
.nav-back:hover { color: var(--primary); text-decoration: none; }

/* Hero band */
.doc-hero {
  background:
    radial-gradient(700px 300px at 85% -20%, rgba(47, 107, 255, 0.14), transparent 60%),
    radial-gradient(600px 320px at 0% 0%, rgba(102, 187, 106, 0.08), transparent 55%);
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--line);
}
.doc-hero .kicker {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary-soft); color: var(--primary-dark);
  padding: 7px 14px; border-radius: 999px; font-size: 13px; font-weight: 700; margin-bottom: 18px;
}
.doc-hero h1 { font-size: 38px; letter-spacing: -0.5px; margin-bottom: 12px; }
.doc-hero p.sub { color: var(--ink-soft); font-size: 16px; max-width: 640px; }
.doc-meta { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 10px; }
.doc-meta span {
  font-size: 13px; color: var(--ink-faint); background: var(--surface);
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px;
}

/* Content card */
.doc-body { padding: 48px 0 30px; }
.doc-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
  padding: 44px 48px;
}
.notice {
  background: linear-gradient(160deg, #FFF8EC, #FFF3DC);
  border: 1px solid rgba(245, 158, 11, 0.28); border-radius: 14px;
  padding: 18px 20px; margin-bottom: 34px; font-size: 14.5px; color: #7A5A12;
}
.notice b { color: #6B4E0A; }

.doc-card h2 {
  font-size: 21px; margin: 36px 0 14px; padding-left: 14px;
  border-left: 4px solid var(--primary); letter-spacing: -0.2px;
}
.doc-card h2:first-of-type { margin-top: 0; }
.doc-card h3 { font-size: 16.5px; margin: 22px 0 8px; color: var(--ink); }
.doc-card p { color: var(--ink-soft); font-size: 15px; margin-bottom: 14px; }
.doc-card ul, .doc-card ol { color: var(--ink-soft); font-size: 15px; margin: 0 0 16px 22px; }
.doc-card li { margin-bottom: 9px; }
.doc-card strong { color: var(--ink); }
.doc-card .em {
  background: var(--primary-soft); color: var(--primary-dark);
  padding: 2px 7px; border-radius: 6px; font-weight: 600;
}

.callout {
  background: #F3F7FF; border: 1px solid var(--line); border-radius: 14px;
  padding: 18px 20px; margin: 18px 0 22px;
}
.callout p { margin-bottom: 0; }

.contact-box {
  margin-top: 36px; padding: 24px; border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff;
}
.contact-box h3 { color: #fff; margin: 0 0 8px; font-size: 17px; }
.contact-box p { color: rgba(255,255,255,0.9); margin: 0; font-size: 14.5px; }
.contact-box a { color: #fff; font-weight: 700; text-decoration: underline; }

/* Footer */
footer { background: #0E1626; color: #B9C2D4; padding: 48px 0 28px; margin-top: 60px; }
.foot-inner { width: min(1120px, 90vw); margin: 0 auto; }
.foot-links { display: flex; flex-wrap: wrap; gap: 22px; margin-bottom: 22px; }
.foot-links a { font-size: 14px; color: #9BA6BA; }
.foot-links a:hover { color: #fff; text-decoration: none; }
.foot-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: 22px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; color: #79839A;
}

@media (max-width: 760px) {
  .doc-hero h1 { font-size: 30px; }
  .doc-card { padding: 30px 22px; }
}