:root {
  --brand: #0e8fa8;
  --ink: #1a1f2e;
  --muted: #5b6472;
  --line: #e6eaef;
  --bg-soft: #f6f8fa;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-weight: 800;
  font-size: 20px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.5px;
}
.logo em { font-style: normal; color: var(--brand); }
.back {
  color: var(--brand);
  text-decoration: none;
  font-size: 14px;
}
.back:hover { text-decoration: underline; }
main { max-width: 860px; margin: 0 auto; padding: 48px 24px 72px; }
.doc-meta {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 8px;
}
.lang-nav {
  display: flex;
  gap: 4px;
  margin: 0 0 24px;
  font-size: 13px;
}
.lang-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.lang-nav a:hover { color: var(--brand); border-color: var(--brand); }
.lang-nav a.active {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}
h1 {
  font-size: 30px;
  line-height: 1.4;
  margin: 0 0 12px;
  letter-spacing: 1px;
}
.intro {
  background: var(--bg-soft);
  border-left: 3px solid var(--brand);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  font-size: 15px;
  color: var(--muted);
  margin: 24px 0 40px;
}
h2 {
  font-size: 20px;
  margin: 48px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
h2:first-of-type { margin-top: 8px; }
h2 .no { color: var(--brand); margin-right: 8px; font-size: 15px; font-weight: 700; }
h3 {
  font-size: 16px;
  margin: 24px 0 10px;
  color: var(--ink);
}
p { margin: 10px 0; font-size: 15px; }
ul, ol { margin: 10px 0; padding-left: 22px; }
li { margin: 8px 0; font-size: 15px; }
.clause { color: var(--brand); font-weight: 700; margin-right: 4px; }
.doc-footer {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
@media (max-width: 520px) {
  h1 { font-size: 24px; }
  main { padding: 32px 18px 56px; }
}