:root {
  --ink: #10213f;
  --muted: #65748c;
  --line: #e4eaf1;
  --mint: #20b886;
  --mint-soft: #e7fbf4;
  --paper: #ffffff;
  --canvas: #f5f8fb;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.85;
}

a { color: inherit; text-decoration: none; }

.wrap { width: min(1180px, calc(100% - 56px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .9);
  border-bottom: 1px solid rgba(228, 234, 241, .9);
  backdrop-filter: blur(16px);
}

.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: 21px; font-weight: 760; letter-spacing: -.04em; }

.brand-mark {
  width: 38px;
  height: 38px;
  display: inline-block;
  position: relative;
  border-radius: 12px;
  background: var(--ink);
}

.brand-mark::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 12px;
  left: 8px;
  top: 9px;
  border: 4px solid #32d4a0;
  border-top: 0;
  border-radius: 0 0 20px 20px;
  transform: rotate(-5deg);
}

.brand-domain { margin-left: 2px; font-size: 13px; font-weight: 680; letter-spacing: 0; }
.domain-xuedao { color: #415676; }
.domain-space { color: var(--mint); }
.back-home { color: #51637e; font-size: 14px; font-weight: 650; }
.back-home:hover { color: var(--mint); }

.policy-hero { padding: 68px 0 45px; text-align: center; }
.eyebrow { margin: 0 0 12px; color: #188c69; font-size: 13px; font-weight: 750; letter-spacing: .12em; }
.policy-hero h1 { margin: 0; font-size: clamp(32px, 4vw, 48px); letter-spacing: -.055em; line-height: 1.25; }
.policy-hero p:last-child { max-width: 580px; margin: 15px auto 0; color: var(--muted); font-size: 15px; }

.policy-layout { display: grid; grid-template-columns: 215px minmax(0, 1fr); gap: 28px; align-items: start; padding-bottom: 76px; }

.policy-index { position: sticky; top: 100px; padding: 16px 0; }
.policy-index-label { display: block; margin: 0 0 10px 14px; color: #8190a5; font-size: 12px; font-weight: 750; letter-spacing: .08em; }
.policy-index a { display: block; padding: 8px 14px; border-radius: 9px; color: #64738b; font-size: 13px; line-height: 1.45; }
.policy-index a:hover { color: #087c5b; background: var(--mint-soft); }

.policy-paper { padding: 54px clamp(28px, 6vw, 76px); border: 1px solid var(--line); border-radius: 22px; background: var(--paper); box-shadow: 0 16px 45px rgba(32, 61, 101, .06); }
.policy-meta { margin: 0 0 32px; padding: 14px 16px; color: #6c7b90; background: #f8fafc; border-radius: 10px; font-size: 14px; white-space: pre-line; }
.policy-paper h2 { margin: 48px 0 17px; padding-top: 5px; color: var(--ink); font-size: clamp(21px, 2.4vw, 26px); line-height: 1.38; letter-spacing: -.035em; scroll-margin-top: 105px; }
.policy-paper h2:first-of-type { margin-top: 0; }
.policy-paper h3 { margin: 28px 0 10px; color: #243754; font-size: 16px; line-height: 1.55; scroll-margin-top: 105px; }
.policy-paper p { margin: 0 0 17px; color: #4d5d73; font-size: 15px; white-space: pre-line; }
.policy-paper .closing { margin-bottom: 0; }

.site-footer { padding: 25px 0 32px; border-top: 1px solid var(--line); background: #fff; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; color: #6b798e; font-size: 13px; }
.footer-company { font-weight: 650; }
.footer-links { display: flex; gap: 22px; }
.footer-links a:hover { color: var(--mint); }

@media (max-width: 760px) {
  .wrap { width: min(100% - 36px, 1180px); }
  .header-inner { min-height: 66px; }
  .brand { font-size: 19px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 11px; }
  .brand-mark::after { width: 20px; height: 11px; left: 7px; top: 8px; }
  .brand-domain { display: none; }
  .policy-hero { padding: 46px 0 31px; }
  .policy-layout { display: block; padding-bottom: 48px; }
  .policy-index { position: static; display: flex; overflow-x: auto; gap: 6px; margin: 0 0 14px; padding: 0 0 2px; }
  .policy-index-label { display: none; }
  .policy-index a { flex: 0 0 auto; padding: 7px 11px; border: 1px solid var(--line); background: #fff; font-size: 12px; }
  .policy-paper { padding: 31px 22px; border-radius: 16px; }
  .policy-paper h2 { margin-top: 38px; }
  .policy-paper p { font-size: 14px; }
  .footer-inner { align-items: flex-start; flex-direction: column; gap: 10px; }
}