:root {
  font-family: "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
  color: #202124;
  font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: #f7f8fa; }
a { color: inherit; text-decoration: none; }

.site-header {
  height: 68px;
  padding: 0 max(24px, calc((100vw - 1080px)/2));
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid #e3e6ea;
  background: rgba(255,255,255,.94);
}
.site-name { color: #202124; font-size: 17px; font-weight: 700; }
.site-header > span { padding-left: 12px; border-left: 1px solid #dfe3e8; color: #8a919a; font-size: 13px; }
.page-main { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
.page-intro { padding: 48px 0 36px; }
.page-intro h1 { margin: 0 0 10px; font-size: 30px; line-height: 1.3; }
.page-intro p { margin: 0; color: #747b86; font-size: 15px; line-height: 1.7; }
.section-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.section-heading h2 { margin: 0; font-size: 18px; }
.section-heading span { color: #8a919a; font-size: 13px; }
.resource-grid { display: grid; grid-template-columns: 1fr; max-width: 760px; gap: 16px; }
.resource-card {
  display: flex;
  flex-direction: column;
  min-height: 270px;
  padding: 22px;
  border: 1px solid #e0e4e8;
  border-radius: 12px;
  background: #fff;
  transition: border-color .18s, box-shadow .18s;
}
.resource-card:hover { border-color: #cbd2db; box-shadow: 0 8px 24px rgba(27,39,51,.07); }
.resource-number { color: #a1a7b0; font-size: 13px; font-variant-numeric: tabular-nums; }
.resource-card h3 { margin: 18px 0 10px; font-size: 19px; line-height: 1.4; }
.resource-card > p { flex: 1; margin: 0 0 22px; color: #6f7782; font-size: 14px; line-height: 1.75; }
.download-links { display: flex; flex-wrap: wrap; gap: 8px; }
.download-link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 36px;
  padding: 0 11px;
  border: 1px solid #dde1e6;
  border-radius: 7px;
  background: #fafbfc;
  color: #4c5561;
  font-size: 13px;
  font-weight: 600;
}
.download-link span { color: #9ba1aa; }
.download-link:hover { border-color: #aeb7c3; background: #fff; color: #202124; }
.uc:hover { border-color: #ffb44d; color: #c76600; }
.quark:hover { border-color: #ff8798; color: #d63d58; }
.xunlei:hover { border-color: #76bde8; color: #1672ae; }
.site-footer { padding: 42px 20px 28px; color: #9aa0a8; text-align: center; font-size: 12px; }

@media (max-width: 660px) {
  .site-header { height: 62px; padding-inline: 14px; }
  .page-main { width: min(100% - 24px, 1080px); }
  .page-intro { padding: 34px 0 28px; }
  .page-intro h1 { font-size: 25px; }
  .resource-grid { grid-template-columns: 1fr; }
  .resource-card { min-height: 0; padding: 18px; }
  .download-links { display: grid; grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}