/* em-docs · 文档主题(左导航 / 中正文 / 右本页目录)
 * 可覆盖一等 token:--fg / --accent / --bg / --card + body font-family
 */
:root {
  --fg: #1f2328;
  --accent: #2563eb;
  --bg: #ffffff;
  --card: #ffffff;
  --muted: #57606a;
  --line: #e5e7eb;
  --surface: #f6f8fa;
  --code-bg: #1e293b;
  --maxw: 80rem;
  --side-w: 16rem;
  --toc-w: 15rem;
  --radius: 8px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root { --fg:#e6edf3; --muted:#9198a1; --line:#30363d; --surface:#161b22; --bg:#0d1117; --card:#161b22; --accent:#4493f8; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin:0; font-family:var(--font-sans); color:var(--fg); background:var(--bg); line-height:1.65; font-size:15.5px; -webkit-font-smoothing:antiali-serif; }
img,video { max-width:100%; height:auto; }
a { color: var(--accent); text-decoration:none; }
a:hover { text-decoration:underline; }
.skip-link { position:absolute; left:-9999px; top:0; background:var(--accent); color:#fff; padding:.5rem 1rem; z-index:100; }
.skip-link:focus { left:1rem; top:1rem; }

/* topbar */
.topbar { position:sticky; top:0; z-index:30; background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(8px); border-bottom:1px solid var(--line); }
.topbar-inner { display:flex; align-items:center; gap:.75rem; padding:.6rem 1rem; max-width:var(--maxw); margin:0 auto; }
.sidebar-toggle { display:none; width:2.2rem; height:2.2rem; border:1px solid var(--line); background:var(--card); border-radius:var(--radius); cursor:pointer; font-size:1rem; color:var(--fg); }
.brand { display:inline-flex; align-items:center; gap:.5rem; font-weight:700; color:var(--fg); margin-right:auto; }
.brand:hover { text-decoration:none; }
.brand-logo { height:1.5rem; }
.brand-suffix { font-weight:400; color:var(--muted); font-size:.85em; }
.search { display:flex; align-items:center; gap:.25rem; }
.search input { width:11rem; max-width:38vw; padding:.4rem .6rem; border:1px solid var(--line); border-radius:var(--radius); background:var(--card); color:var(--fg); font-size:.9rem; }
.search input:focus { outline:2px solid var(--accent); border-color:var(--accent); }
.search button { border:1px solid var(--line); background:var(--surface); border-radius:var(--radius); padding:.35rem .5rem; cursor:pointer; }
.ems-account { display:inline-flex; }

/* layout */
.layout { display:grid; grid-template-columns: var(--side-w) minmax(0,1fr) var(--toc-w); gap:0; max-width:var(--maxw); margin:0 auto; align-items:start; }
.sidebar { position:sticky; top:3.05rem; align-self:start; padding:1.5rem 1rem 2rem; border-right:1px solid var(--line); max-height:calc(100vh - 3.05rem); overflow:auto; }
.toc-rail { display:none; } /* 默认隐藏,仅 has-toc 时显示 */

.content { padding:1.5rem 2rem 4rem; min-width:0; }
.crumb { font-size:.82rem; color:var(--muted); margin-bottom:1rem; }
.crumb span { margin:0 .25rem; }

/* hero / section cards */
.doc-hero { margin-bottom:2rem; }
.doc-hero h1 { font-size:2rem; margin:0 0 .5rem; }
.doc-cards { display:grid; grid-template-columns:repeat(auto-fill,minmax(15rem,1fr)); gap:1rem; }
.doc-card { display:block; padding:1.1rem 1.25rem; border:1px solid var(--line); border-radius:var(--radius); background:var(--card); transition:border-color .15s, box-shadow .15s; }
.doc-card:hover { text-decoration:none; border-color: color-mix(in srgb,var(--accent) 50%, var(--line)); box-shadow:0 4px 12px rgba(0,0,0,.06); }
.doc-card h3 { margin:0 0 .35rem; font-size:1.05rem; color:var(--fg); }
.doc-card p { margin:0 0 .6rem; font-size:.9rem; color:var(--muted); }
.doc-card-go { font-size:.85rem; color:var(--accent); font-weight:600; }

/* doc head */
.doc-head { margin-bottom:1.5rem; padding-bottom:1rem; border-bottom:1px solid var(--line); }
.doc-head h1 { font-size:1.9rem; margin:0 0 .35rem; line-height:1.2; }
.doc-desc { font-size:1.1rem; color:var(--muted); margin:.4rem 0 0; }
.doc-meta { display:flex; flex-wrap:wrap; gap:1rem; font-size:.82rem; color:var(--muted); margin:.6rem 0 0; }

.doc-list { list-style:none; padding:0; margin:1.5rem 0; }
.doc-list li { padding:.55rem 0; border-bottom:1px solid var(--line); }
.doc-list-d { color:var(--muted); font-size:.92rem; }

/* prose (docs) */
.prose { font-size:1.02rem; }
.prose h2 { font-size:1.45rem; margin:2rem 0 .7rem; padding-top:.5rem; }
.prose h3 { font-size:1.18rem; margin:1.5rem 0 .5rem; }
.prose h4 { font-size:1rem; margin:1.2rem 0 .4rem; }
.prose p { margin:0 0 1rem; }
.prose ul, .prose ol { padding-left:1.4rem; margin:0 0 1rem; }
.prose li { margin:.25rem 0; }
.prose blockquote { margin:1.1rem 0; padding:.5rem 1rem; border-left:3px solid var(--accent); background:var(--surface); color:var(--muted); border-radius:0 var(--radius) var(--radius) 0; }
.prose pre { background:var(--code-bg); color:#e6edf3; border-radius:var(--radius); padding:1rem; overflow-x:auto; font-family:var(--font-mono); font-size:.86rem; line-height:1.5; }
.prose pre code { background:none; padding:0; color:inherit; }
.prose code { font-family:var(--font-mono); }
.prose :not(pre)>code { background:var(--surface); padding:.12rem .35rem; border-radius:4px; font-size:.86em; color: var(--fg); }
.prose table { width:100%; border-collapse:collapse; margin:1rem 0; display:block; overflow-x:auto; }
.prose th, .prose td { border:1px solid var(--line); padding:.5rem .7rem; text-align:left; }
.prose th { background:var(--surface); }
.prose img { border-radius:var(--radius); border:1px solid var(--line); }
.prose hr { border:0; border-top:1px solid var(--line); margin:2rem 0; }

/* toc rail */
body.has-toc .toc-rail { display:block; position:sticky; top:3.05rem; align-self:start; padding:1.5rem 1rem 2rem; border-left:1px solid var(--line); max-height:calc(100vh - 3.05rem); overflow:auto; }
.toc-title { font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; color:var(--muted); margin:0 0 .6rem; font-weight:600; }
.toc-list { list-style:none; margin:0; padding:0; }
.toc-item { margin:.15rem 0; line-height:1.35; }
.toc-item a { color:var(--muted); font-size:.82rem; display:block; padding:.1rem 0; border-left:2px solid transparent; padding-left:.5rem; }
.toc-item a:hover { color:var(--accent); text-decoration:none; }
.toc-list .toc-list { padding-left:.75rem; }
.toc-l4 a, .toc-l5 a, .toc-l6 a { font-size:.78rem; }

/* prev/next pager */
.doc-pager { display:flex; justify-content:space-between; gap:1rem; margin-top:3rem; padding-top:1.5rem; border-top:1px solid var(--line); }
.pager-cell { display:flex; flex-direction:column; max-width:48%; }
.pager-cell--right { text-align:right; }
.pager-label { font-size:.76rem; color:var(--muted); }
.pager-link { font-weight:600; margin-top:.15rem; }

/* btn */
.btn { display:inline-block; padding:.55rem 1.1rem; border-radius:var(--radius); font-weight:600; border:1px solid var(--line); background:var(--card); color:var(--fg); }
.btn-primary { background:var(--accent); border-color:var(--accent); color:#fff; }
.btn-primary:hover { text-decoration:none; filter:brightness(1.07); }

/* 404 */
.not-found { text-align:center; padding:3rem 0; }

/* footer */
.site-footer { border-top:1px solid var(--line); background:var(--surface); }
.footer-inner { max-width:var(--maxw); margin:0 auto; padding:1rem 1.25rem; display:flex; gap:1rem; font-size:.82rem; color:var(--muted); flex-wrap:wrap; }

/* responsive */
@media (max-width: 1024px) {
  .layout { grid-template-columns: var(--side-w) minmax(0,1fr); }
  body.has-toc .toc-rail { display:none; }
}
@media (max-width: 860px) {
  .sidebar-toggle { display:inline-flex; align-items:center; justify-content:center; }
  .layout { grid-template-columns: minmax(0,1fr); }
  .sidebar { display:none; position:fixed; top:3.05rem; left:0; right:0; bottom:0; z-index:25; background:var(--card); padding:1rem; overflow:auto; box-shadow:0 8px 24px rgba(0,0,0,.15); }
  .sidebar.is-open { display:block; }
  .content { padding:1.25rem 1.1rem 3rem; }
}