/* CrossChat 官网/法律页静态样式（无外部字体、无 CDN、无统计脚本） */
:root {
  --blue: #1f6feb;
  --blue-d: #1858c0;
  --ink: #1f2328;
  --muted: #57606a;
  --line: #d8dee4;
  --bg: #f6f8fa;
  --green: #116329;
  --green-bg: #dafbe1;
  --red: #82071e;
  --red-bg: #ffebe9;
  --amber-bg: #fff8c5;
  --amber-ink: #7d4e00;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
  font-size: 15px;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }
.container { max-width: 920px; margin: 0 auto; padding: 0 20px; }

/* 语言切换 */
.langbar { background: var(--bg); border-bottom: 1px solid var(--line); font-size: 13px; }
.langbar .container { display: flex; justify-content: flex-end; gap: 4px; padding-top: 6px; padding-bottom: 6px; }
.langbar button {
  border: 1px solid var(--line); background: #fff; border-radius: 6px; padding: 3px 12px;
  font: inherit; font-size: 13px; cursor: pointer; color: var(--muted);
}
.langbar button.on { background: var(--blue); border-color: var(--blue); color: #fff; }
body[data-lang="zh"] .en { display: none; }
body[data-lang="en"] .zh { display: none; }

/* 导航 */
.nav { border-bottom: 1px solid var(--line); background: #fff; position: sticky; top: 0; z-index: 10; }
.nav .container { display: flex; align-items: center; gap: 18px; height: 56px; }
.nav .brand { font-weight: 700; font-size: 16px; color: var(--ink); }
.nav .links { margin-left: auto; display: flex; gap: 16px; font-size: 14px; }
.nav .links a { color: var(--muted); }

/* hero */
.hero { background: linear-gradient(180deg, #f6f8fa 0%, #fff 100%); padding: 72px 0 56px; text-align: center; }
.hero h1 { font-size: 38px; margin: 0 0 14px; letter-spacing: .5px; }
.hero p.sub { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0 auto 28px; }
.badge-draft { display: inline-block; background: var(--green-bg); color: var(--green); border-radius: 20px; padding: 4px 14px; font-size: 13px; font-weight: 600; margin-bottom: 18px; }
.btn {
  display: inline-block; background: var(--blue); color: #fff; border-radius: 8px; padding: 11px 26px;
  font-size: 15px; font-weight: 600; border: none; cursor: pointer;
}
.btn:hover { background: var(--blue-d); text-decoration: none; }
.btn.ghost { background: #fff; color: var(--blue); border: 1px solid var(--blue); }
.hero .meta { margin-top: 16px; font-size: 13px; color: var(--muted); }

/* 特性/步骤 */
section.block { padding: 48px 0; border-top: 1px solid #eaeef2; }
h2 { font-size: 26px; margin: 0 0 8px; }
.lead { color: var(--muted); margin: 0 0 28px; }
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.card3 { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; }
.card3 h3 { margin: 0 0 6px; font-size: 16px; }
.card3 p { margin: 0; color: var(--muted); font-size: 14px; }
ol.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; }
ol.steps > li {
  counter-increment: s; position: relative; padding: 14px 0 14px 52px; border-bottom: 1px solid #eaeef2;
}
ol.steps > li:last-child { border-bottom: none; }
ol.steps > li::before {
  content: counter(s); position: absolute; left: 0; top: 14px; width: 30px; height: 30px;
  background: var(--blue); color: #fff; border-radius: 50%; text-align: center; line-height: 30px; font-weight: 700;
}

/* 截图 */
.shots { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.shots img { width: 100%; border: 1px solid var(--line); border-radius: 10px; display: block; }
.shots img:first-child { grid-column: 1 / -1; }

/* 提示框 */
.note { border-radius: 10px; padding: 14px 18px; margin: 18px 0; font-size: 14px; }
.note.ok { background: var(--green-bg); color: var(--green); }
.note.warn { background: var(--amber-bg); color: var(--amber-ink); }
.note.info { background: #ddf4ff; color: #0969da; }

/* 法律页 */
.legal { max-width: 820px; margin: 0 auto; padding: 40px 20px 80px; }
.legal h1 { font-size: 30px; margin-bottom: 4px; }
.legal h2 { font-size: 20px; margin: 32px 0 8px; }
.legal h3 { font-size: 16px; margin: 20px 0 6px; }
.legal p, .legal li { font-size: 14.5px; }
.legal table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 13.5px; }
.legal th, .legal td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.legal th { background: var(--bg); }
.toc { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 12px 18px; margin: 20px 0; font-size: 14px; }
.toc a { margin-right: 14px; white-space: nowrap; }
.fill { background: #ffebe9; color: var(--red); border-radius: 4px; padding: 0 4px; font-weight: 600; }

/* FAQ */
details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 18px; margin-bottom: 10px; background: #fff; }
details summary { font-weight: 600; cursor: pointer; }
details p { margin: 10px 0 2px; color: var(--muted); font-size: 14px; }

/* footer */
footer { border-top: 1px solid var(--line); background: var(--bg); padding: 28px 0; font-size: 13px; color: var(--muted); }
footer .container { display: flex; flex-wrap: wrap; gap: 16px; }
footer .right { margin-left: auto; }

@media (max-width: 720px) {
  .grid, .shots { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
}