:root{
    --bg:#0b0f18; --panel:#161c2b; --panel2:#1d2536; --line:#2a3450;
    --txt:#e6ebf5; --muted:#93a1be; --accent:#4f8cff; --accent2:#22c55e;
    --amber:#f59e0b; --red:#ef4444; --blue:#38bdf8; --purple:#a78bfa;
    --toc-w:240px;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth;scrollbar-gutter:stable}
  body{
    margin:0;font-family:"Microsoft YaHei","Segoe UI",Arial,sans-serif;
    background:linear-gradient(160deg,#080c14,#0f1420 45%,#0b101a);
    color:var(--txt);line-height:1.65;font-size:15px;
  }
  a{color:var(--accent);text-decoration:none}
  a:hover{text-decoration:underline}
  code,kbd{
    font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12.5px;
    background:var(--panel2);border:1px solid var(--line);border-radius:6px;
    padding:1px 6px;color:#cfe0ff;
  }
  kbd{padding:2px 7px}

  /* —— 顶栏 —— */
  .doc-header{
    position:sticky;top:0;z-index:50;
    display:flex;align-items:center;gap:14px;flex-wrap:wrap;
    padding:12px 22px;border-bottom:1px solid var(--line);
    background:rgba(11,15,24,.92);backdrop-filter:blur(10px);
  }
  .logo{
    width:34px;height:34px;border-radius:9px;flex-shrink:0;
    background:linear-gradient(135deg,var(--accent),#7c3aed);
    display:grid;place-items:center;font-weight:800;color:#fff;
  }
  .doc-header h1{margin:0;font-size:16px;font-weight:700}
  .doc-header .sub{color:var(--muted);font-size:12px;margin-top:1px}
  .doc-header .meta{
    margin-left:auto;display:flex;gap:8px;flex-wrap:wrap;align-items:center;
  }
  .pill{
    font-size:11px;padding:3px 10px;border-radius:999px;
    border:1px solid var(--line);color:var(--muted);background:var(--panel);
  }
  .pill.accent{border-color:#34507e;color:#cfe0ff;background:#1b2740}

  /* —— 布局 —— */
  .layout{display:flex;align-items:flex-start;max-width:1280px;margin:0 auto}
  .toc{
    position:sticky;top:62px;width:var(--toc-w);flex:0 0 var(--toc-w);
    max-height:calc(100vh - 72px);overflow:auto;padding:18px 12px 40px 18px;
    border-right:1px solid var(--line);
  }
  .toc h2{font-size:11px;letter-spacing:.08em;color:var(--muted);margin:0 0 10px;text-transform:uppercase}
  .toc a{
    display:block;color:var(--muted);font-size:13px;padding:5px 8px;border-radius:8px;
    text-decoration:none;line-height:1.35;
  }
  .toc a:hover,.toc a:focus{background:var(--panel2);color:var(--txt);text-decoration:none}
  .toc .l2{padding-left:16px;font-size:12px}
  .content{flex:1;min-width:0;padding:28px 32px 80px}
  @media (max-width:900px){
    .toc{display:none}
    .content{padding:20px 16px 60px}
  }

  /* —— 排版 —— */
  h2{
    margin:40px 0 14px;font-size:22px;font-weight:700;
    padding-bottom:8px;border-bottom:1px solid var(--line);
  }
  h2:first-child{margin-top:0}
  h3{margin:28px 0 10px;font-size:17px;color:#dbe7ff}
  h4{margin:18px 0 8px;font-size:14.5px;color:#c5d4f0}
  p{margin:10px 0;color:#d5dceb}
  .lead{font-size:16px;color:var(--muted);max-width:68ch}
  ul,ol{margin:8px 0 12px;padding-left:1.35em;color:#d5dceb}
  li{margin:4px 0}
  .note{
    margin:14px 0;padding:12px 14px;border-radius:12px;
    border:1px solid #34507e;background:#152033;color:#cfe0ff;font-size:13.5px;
  }
  .warn{
    margin:14px 0;padding:12px 14px;border-radius:12px;
    border:1px solid #7a5a1a;background:#2a220e;color:#ffe6a8;font-size:13.5px;
  }
  .tip{
    margin:14px 0;padding:12px 14px;border-radius:12px;
    border:1px solid #1f4a32;background:#102418;color:#b6f0c8;font-size:13.5px;
  }

  table{
    width:100%;border-collapse:collapse;margin:12px 0 18px;font-size:13.5px;
    background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  }
  th,td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
  th{background:var(--panel2);color:#cfe0ff;font-weight:600;white-space:nowrap}
  tr:last-child td{border-bottom:none}
  tr:hover td{background:rgba(79,140,255,.04)}

  /* —— UI 示意组件 —— */
  .ui-mock{
    margin:16px 0 22px;border:1px solid var(--line);border-radius:14px;
    background:var(--panel);overflow:hidden;box-shadow:0 12px 40px #0005;
  }
  .ui-mock .bar{
    display:flex;align-items:center;gap:8px;flex-wrap:wrap;
    padding:10px 14px;border-bottom:1px solid var(--line);background:#121826;
  }
  .ui-mock .body{padding:14px}
  .navchip{
    padding:6px 12px;border-radius:8px;font-size:12.5px;font-weight:600;
    border:1px solid transparent;color:var(--muted);background:transparent;
  }
  .navchip.on{background:#1b2740;color:#fff;border-color:#34507e}
  .btn{
    display:inline-block;border:none;border-radius:8px;padding:6px 12px;
    font-size:12.5px;font-weight:600;background:var(--accent);color:#fff;
  }
  .btn.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
  .btn.sm{padding:4px 10px;font-size:12px}
  .btn.danger{background:#5a1d1d;color:#ffb4b4;border:1px solid #7a2b2b}
  .tag{
    display:inline-block;font-size:11px;padding:1px 7px;border-radius:20px;margin-left:4px;
    font-weight:700;vertical-align:middle;
  }
  .tag.s3{background:#13351f;color:#5fe08a}
  .tag.s2{background:#0e2a40;color:#7fd3f5}
  .tag.warn{background:#3a2a08;color:#ffcf6b}
  .tag.alert{background:#5a1d1d;color:#ffb4b4}
  .tag.unknown{background:#4c1d95;color:#e9d5ff}
  .tag.supplement{background:#7f1d1d;color:#fecaca}
  .tag.confirm{background:#1e3a8a;color:#93c5fd}
  .drop-demo{
    border:2px dashed var(--line);border-radius:12px;padding:18px;text-align:center;
    background:var(--panel2);color:var(--muted);font-size:13px;
  }
  .drop-demo b{color:var(--accent)}
  .mini-table{width:100%;font-size:12px;border-collapse:collapse}
  .mini-table th,.mini-table td{padding:7px 8px;border-bottom:1px solid var(--line)}
  .mini-table th{color:var(--muted);font-weight:600}
  .row-mark-r td:first-child{box-shadow:inset 3px 0 0 #f87171}
  .row-mark-p td:first-child{box-shadow:inset 3px 0 0 #a78bfa}
  .row-mark-b td:first-child{box-shadow:inset 3px 0 0 #38bdf8}
  .flow{
    display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:14px 0 8px;
  }
  .flow .step{
    background:var(--panel2);border:1px solid var(--line);border-radius:10px;
    padding:8px 12px;font-size:13px;font-weight:600;
  }
  .flow .arrow{color:var(--muted);font-size:14px}
  .grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
  @media (max-width:700px){.grid2{grid-template-columns:1fr}}
  .card-lite{
    background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;
  }
  .card-lite h4{margin-top:0}
  .muted{color:var(--muted)}
  .shot{
    margin:14px 0 20px;border:1px solid var(--line);border-radius:14px;
    overflow:hidden;background:#0a0e16;box-shadow:0 12px 40px #0005;
  }
  .shot img{
    display:block;width:100%;height:auto;vertical-align:top;
  }
  .shot figcaption{
    padding:9px 12px;font-size:12.5px;color:var(--muted);
    border-top:1px solid var(--line);background:#121826;line-height:1.45;
  }
  .foot{
    margin-top:48px;padding-top:16px;border-top:1px solid var(--line);
    color:var(--muted);font-size:12.5px;
  }
  .toc-toggle{
    display:none;margin-left:auto;background:var(--panel2);color:var(--txt);
    border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:12px;
  }
  @media (max-width:900px){
    .toc-toggle{display:inline-block}
    .toc.open{
      display:block;position:fixed;left:0;top:56px;bottom:0;z-index:40;
      background:rgba(11,15,24,.98);width:min(280px,85vw);box-shadow:8px 0 30px #0008;
    }
  }