/* ==========================================================================
   独立公开文档页（/doc 与 /doc/{slug}）· 零构建，纯手写
   --------------------------------------------------------------------------
   服务端渲染：访客可能没登录、可能来自搜索引擎，所以不引任何前端框架，
   首屏就是完整 HTML。正文排版复用 doc-static/markdown.css（与后台预览同源）。
   ========================================================================== */
:root {
  /* 与 market / dev-ui / admin 共用同一套色板（docs/ui-redesign.md A.2），改主色只改 --brand */
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --border: #e5e6eb;
  --border-weak: #f2f3f5;
  --text: #1d2129;
  --text-sub: #4e5969;
  --muted: #86909c;
  --brand: #0064c8;
  --brand-dark: #0057ad;
  --brand-soft: #eaf3ff;
  --nav-w: 268px;
  --top-h: 56px;
  --radius: 4px;
  --radius-lg: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }

/* ---------- 顶栏 ---------- */
.doc-top {
  height: var(--top-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 30;
}
.doc-top .brand { font-size: 15px; font-weight: 600; color: var(--text); white-space: nowrap; }
.doc-top .tagline {
  font-size: 12px;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}
.doc-top .spacer { flex: 1; }
.doc-top .top-link { font-size: 13px; color: var(--text-sub); white-space: nowrap; }
.doc-top .top-link:hover { color: var(--brand); }
.doc-top .menu-btn {
  display: none;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  font-size: 15px;
  line-height: 1;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text-sub);
}

/* ---------- 布局 ---------- */
.doc-layout { display: flex; align-items: flex-start; }

.doc-nav {
  width: var(--nav-w);
  flex: 0 0 var(--nav-w);
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
  position: sticky;
  top: var(--top-h);
  height: calc(100vh - var(--top-h));
  overflow-y: auto;
  padding: 18px 12px 40px;
}
.nav-title {
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: .5px;
  padding: 0 12px 10px;
}
.nav-group {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-sub);
  padding: 14px 12px 5px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-group .ico { opacity: .8; }
.nav-item {
  display: block;
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 1px;
}
.nav-item:hover { background: #eef1f6; color: var(--text); }
.nav-item.on { background: var(--brand); color: #fff; font-weight: 500; }
.nav-item.depth-0 { padding-left: 12px; }
.nav-item.depth-1 { padding-left: 24px; }
.nav-item.depth-2 { padding-left: 36px; }
.nav-item.depth-3 { padding-left: 48px; }
.nav-empty { padding: 20px 12px; font-size: 12.5px; color: var(--muted); }

.doc-main { flex: 1; min-width: 0; padding: 30px 44px 80px; }
.doc-inner { max-width: 860px; }

/* ---------- 文档头 ---------- */
.doc-head { margin-bottom: 22px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.doc-head h1 { font-size: 25px; margin: 0 0 8px; line-height: 1.35; font-weight: 650; }
.doc-head .meta { font-size: 12.5px; color: var(--muted); display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 上/下一篇 ---------- */
.doc-foot-nav { display: flex; gap: 12px; margin-top: 42px; padding-top: 20px; border-top: 1px solid var(--border); }
.doc-foot-nav .pn {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  transition: border-color .15s;
}
.doc-foot-nav .pn:hover { border-color: var(--brand); }
.doc-foot-nav .pn.next { text-align: right; }
.doc-foot-nav .pn .k { font-size: 11.5px; color: var(--muted); display: block; margin-bottom: 3px; }
.doc-foot-nav .pn .t {
  font-size: 13.5px; color: var(--text); font-weight: 500;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: block;
}
.doc-foot-nav .pn.placeholder { border-color: transparent; }

/* ---------- 首页概览 ---------- */
.hero { margin-bottom: 30px; }
.hero h1 { font-size: 27px; margin: 0 0 10px; font-weight: 650; }
.hero p { color: var(--text-sub); font-size: 14.5px; margin: 0; max-width: 620px; }

.group-block { margin-bottom: 30px; }
.group-block h2 { font-size: 15px; margin: 0 0 14px; display: flex; align-items: center; gap: 8px; }
.group-block h2 .ico { opacity: .75; }
.group-block h2 .n { font-size: 12px; color: var(--muted); font-weight: 400; }

.doc-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(258px, 1fr)); gap: 12px; }
.doc-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 15px 17px;
  background: #fff;
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
.doc-card:hover {
  border-color: var(--brand);
  box-shadow: 0 4px 18px rgba(43, 127, 212, .1);
  transform: translateY(-1px);
}
.doc-card .t { font-size: 14.5px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
.doc-card .s { font-size: 12.8px; color: var(--muted); line-height: 1.65; }

/* ---------- 空态 / 404 ---------- */
.notice {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 54px 24px;
  text-align: center;
  background: var(--bg-soft);
}
.notice h1 { font-size: 19px; margin: 0 0 8px; }
.notice p { color: var(--muted); margin: 0 0 18px; font-size: 13.5px; }

/* ---------- 页脚 ---------- */
.doc-pagefoot {
  padding: 20px 44px 40px;
  font-size: 12.5px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  text-align: center;
}

/* ---------- 移动端：侧栏变抽屉 ---------- */
.nav-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .42);
  z-index: 38;
}

@media (max-width: 900px) {
  .doc-top .menu-btn { display: inline-flex; }
  .doc-nav {
    position: fixed;
    top: var(--top-h);
    left: 0;
    bottom: 0;
    height: auto;
    width: 282px;
    z-index: 40;
    transform: translateX(-102%);
    transition: transform .22s ease;
    box-shadow: 6px 0 24px rgba(16, 24, 40, .1);
  }
  body.nav-open .doc-nav { transform: none; }
  body.nav-open .nav-mask { display: block; }
  .doc-main { padding: 20px 18px 60px; }
  .doc-head h1 { font-size: 21px; }
  .hero h1 { font-size: 22px; }
  .doc-foot-nav { flex-direction: column; }
  .doc-cards { grid-template-columns: 1fr; }
  .doc-pagefoot { padding: 18px 18px 32px; }
}