.page {
    max-width: 80%;
    margin: 0 auto;
    padding: 30px 24px 24px;
}
  /* ---------- 标题区 ---------- */
  .doc-head{margin-bottom:34px}
  .tag{
    display:inline-block;
    font-size:12px;font-weight:600;letter-spacing:.1em;
    color:var(--brand);background:var(--brand-soft);
    padding:5px 13px;border-radius:999px;margin-bottom:18px;
  }
  .doc-head h1{
    font-size:40px;line-height:1.22;margin:0 0 16px;
    letter-spacing:-.5px;font-weight:800;
  }
  .lead{
    margin:0 0 24px;
    font-size:15.5px;color:var(--muted);line-height:1.85;
  }
  .meta{
    display:flex;flex-direction:column;gap:8px;
    padding:16px 20px;
    background:var(--card);
    border:1px solid var(--border);
    border-radius:12px;
    box-shadow:var(--shadow);
  }
  .meta p{margin:0;font-size:13.5px;color:var(--body);line-height:1.7}
  .meta-k{
    display:inline-block;
    min-width:76px;
    margin-right:10px;
    font-weight:600;
    color:var(--muted);
    font-size:12.5px;
    letter-spacing:.04em;
  }

  /* ---------- 正文卡片 ---------- */
  .doc-section{
    background:var(--card);
    border:1px solid var(--border);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
    padding:36px 40px;
    margin-bottom:22px;
    scroll-margin-top:24px;
  }
  .doc-section h2{
    display:flex;align-items:center;gap:12px;
    font-size:21px;font-weight:700;
    margin:0 0 22px;letter-spacing:-.2px;
  }
  .doc-section h2::before{
    content:"";flex:none;
    width:4px;height:20px;border-radius:2px;background:var(--brand);
  }
  .doc-section h3{
    font-size:15.5px;font-weight:600;color:var(--text);
    margin:28px 0 10px;
  }
  .doc-section h3:first-of-type{margin-top:6px}
  .doc-section p{margin:0 0 14px;color:var(--body)}
  .doc-section ul,
  .doc-section ol{margin:0 0 16px;padding-left:22px;color:var(--body)}
  .doc-section li{margin-bottom:9px}
  .doc-section li::marker{color:var(--brand);font-weight:600}
  .doc-section strong{color:var(--text);font-weight:600}

  /* 重点文字：深黑底色 */
  .hl{
    background:var(--ink);
    color:#fff;
    padding:2px 7px;
    border-radius:6px;
    font-weight:600;
    -webkit-box-decoration-break:clone;
    box-decoration-break:clone;
  }

  .callout{
    background:var(--brand-soft);
    border:1px solid var(--brand-line);
    border-radius:12px;
    padding:15px 18px;
    font-size:14px;
    color:#2b4485;
    margin:0 0 18px;
  }
  .callout strong{color:#1f3a80}

  .divider{height:1px;background:var(--border);border:0;margin:30px 0}

  .doc-foot{
    text-align:center;
    padding:8px 0 0;
    font-size:13.5px;
    color:var(--muted);
  }
  .doc-foot .mark{color:var(--brand);font-weight:600}

  /* ---------- 响应式 ---------- */
  @media (max-width:640px){
    .page{padding:34px 16px 64px}
    .doc-head h1{font-size:28px}
    .lead{font-size:14.5px}
    .meta{padding:14px 16px}
    .meta-k{display:block;min-width:0;margin:0 0 2px}
    .doc-section{padding:22px 18px;border-radius:14px}
    .doc-section h2{font-size:18.5px;margin-bottom:18px}
  }