:root {
    --bg: #eef2f9;
    --card: #ffffff;
    --text: #0f172a;
    --text2: #475569;
    --text3: #94a3b8;
    --accent: #2563eb;
    --accent2: #0891b2;
    --border: #e2e8f0;
    --up: #ef4444;
    --down: #16a34a;
    --warn: #f59e0b;
    --tag: #eef2ff;
    --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    background-image:
      radial-gradient(circle at 12% 8%, rgba(37,99,235,0.10), transparent 42%),
      radial-gradient(circle at 88% 4%, rgba(8,145,178,0.10), transparent 40%),
      radial-gradient(rgba(15,23,42,0.045) 1px, transparent 1px);
    background-size: auto, auto, 22px 22px;
    color: var(--text);
    line-height: 1.7;
    padding-bottom: 2rem;
  }
  /* ---------- 头部 ---------- */
  .header {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #070b18 0%, #0f2350 45%, #0e7490 100%);
    color: #fff;
    padding: 1.9rem 1rem 1.6rem;
    text-align: center;
  }
  .header::before {
    content: "";
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(56,189,248,0.10) 1px, transparent 1px),
      linear-gradient(90deg, rgba(56,189,248,0.10) 1px, transparent 1px);
    background-size: 34px 34px;
    mask-image: radial-gradient(circle at 50% 30%, #000 35%, transparent 78%);
    -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 35%, transparent 78%);
  }
  .header > * { position: relative; }
  .kicker {
    display: inline-block;
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.22em;
    color: #7dd3fc;
    border: 1px solid rgba(125,211,252,0.35);
    border-radius: 1rem;
    padding: 0.2rem 0.7rem;
    margin-bottom: 0.6rem;
  }
  .header h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    background: linear-gradient(92deg, #ffffff 10%, #7dd3fc 60%, #a5b4fc 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.5rem;
  }
  .chips { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.35rem; }
  .chip {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    border-radius: 0.4rem;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.16);
    color: #e2e8f0;
    font-family: var(--mono);
  }
  .chip b { color: #7dd3fc; font-weight: 600; }
  /* ---------- 阅读进度 ---------- */
  .bar { position: fixed; top: 0; left: 0; height: 2px; width: 0;
    background: linear-gradient(90deg, #22d3ee, #2563eb); z-index: 200; }
  /* ---------- 导航 ---------- */
  .nav {
    position: sticky; top: 0;
    background: rgba(255,255,255,0.86);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    overflow-x: auto; white-space: nowrap;
    padding: 0.5rem 0.5rem; z-index: 100;
    -webkit-overflow-scrolling: touch;
  }
  .nav a {
    display: inline-block; padding: 0.3rem 0.7rem; margin: 0 0.16rem;
    font-size: 0.76rem; color: var(--text2); text-decoration: none;
    border-radius: 0.55rem; background: #f1f5f9;
  }
  .nav a:active, .nav a:focus { background: var(--accent); color: #fff; outline: none; }
  .nav a.cta {
    background: linear-gradient(135deg, #0f766e 0%, #2563eb 100%);
    color: #fff; font-weight: 600;
  }
  /* ---------- 加群横幅 ---------- */
  .join-banner { max-width: 760px; margin: 0.9rem auto 0; padding: 0 1rem; }
  .join-banner a {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.65rem 0.9rem; border-radius: 12px;
    background: linear-gradient(135deg, #0f766e 0%, #2563eb 100%);
    color: #fff; text-decoration: none;
    box-shadow: 0 4px 14px rgba(37,99,235,0.22);
  }
  .join-banner .txt { flex: 1; }
  .join-banner .txt b { display: block; font-size: 0.86rem; }
  .join-banner .txt span { font-size: 0.72rem; opacity: 0.9; }
  .join-banner .arrow { font-size: 1.1rem; }
  /* ---------- 容器与卡片 ---------- */
  .container { max-width: 760px; margin: 0 auto; padding: 0.9rem 1rem; }
  .card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1.15rem 1.1rem;
    margin-bottom: 0.9rem;
    box-shadow: 0 1px 2px rgba(15,23,42,0.04), 0 8px 24px -18px rgba(15,23,42,0.25);
    position: relative;
    overflow: hidden;
  }
  .card::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, #22d3ee, #2563eb, #7c3aed);
    opacity: 0.85;
  }
  .card h2 {
    display: flex; align-items: flex-start; gap: 0.5rem;
    font-size: 1.02rem; line-height: 1.5; color: var(--text);
    margin-bottom: 0.75rem; padding-bottom: 0.6rem;
    border-bottom: 1px dashed var(--border);
    scroll-margin-top: 3.6rem;
  }
  .card h2 .num {
    flex: none;
    font-family: var(--mono); font-size: 0.72rem; font-weight: 700;
    color: #fff; background: linear-gradient(135deg, #0891b2, #2563eb);
    border-radius: 0.35rem; padding: 0.1rem 0.4rem; margin-top: 0.16rem;
  }
  .card h2 .h2t { flex: 1; }
  .card h3 { font-size: 0.95rem; margin: 0.95rem 0 0.45rem; color: var(--text); }
  .card h3::before {
    content: ""; display: inline-block; width: 4px; height: 0.85em;
    background: linear-gradient(180deg, #22d3ee, #2563eb);
    border-radius: 2px; margin-right: 0.4rem; vertical-align: -0.1em;
  }
  .card h4 { font-size: 0.88rem; margin: 0.75rem 0 0.35rem; color: var(--text2); }
  .card p { font-size: 0.88rem; color: var(--text2); margin-bottom: 0.6rem; }
  .card ul, .card ol { margin-left: 1.15rem; margin-bottom: 0.6rem; font-size: 0.88rem; color: var(--text2); }
  .card li { margin-bottom: 0.32rem; }
  .card strong { color: var(--text); }
  .card a { color: var(--accent); }
  hr { border: none; border-top: 1px dashed var(--border); margin: 0.9rem 0; }
  blockquote {
    border-left: 3px solid var(--accent2); padding-left: 0.8rem;
    color: var(--text2); font-size: 0.85rem; margin-bottom: 0.6rem;
    background: #f8fafc; border-radius: 0 8px 8px 0; padding: 0.5rem 0.8rem;
  }
  /* ---------- 目录 ---------- */
  .toc { padding-top: 1rem; }
  .toc-h { border: none; padding-bottom: 0.4rem; margin-bottom: 0.5rem; }
  .toc-row {
    display: flex; align-items: center; gap: 0.55rem;
    padding: 0.5rem 0.55rem; border-radius: 0.5rem;
    text-decoration: none; color: var(--text2); font-size: 0.85rem;
  }
  .toc-row:nth-child(odd) { background: #f8fafc; }
  .toc-row:active { background: var(--tag); }
  .toc-n { font-family: var(--mono); font-size: 0.72rem; font-weight: 700;
    color: var(--accent); background: var(--tag); border-radius: 0.3rem;
    padding: 0.05rem 0.35rem; flex: none; }
  .toc-t { flex: 1; }
  .toc-a { color: var(--text3); }
  /* ---------- 了解更多 ---------- */
  .more { margin-top: 0.85rem; padding-top: 0.7rem; border-top: 1px dashed var(--border); }
  .more-h {
    font-size: 0.7rem; font-family: var(--mono); letter-spacing: 0.08em;
    color: var(--text3); margin-bottom: 0.45rem;
  }
  .more-links { display: flex; flex-direction: column; gap: 0.35rem; }
  .src {
    display: flex; align-items: center; gap: 0.4rem;
    padding: 0.45rem 0.6rem; border-radius: 0.5rem;
    background: linear-gradient(90deg, #f8fafc, #f1f5f9);
    border: 1px solid var(--border);
    text-decoration: none; font-size: 0.8rem; color: #1e293b;
  }
  .src:active { background: var(--tag); border-color: #c7d2fe; }
  .src-t { flex: 1; }
  .src-i { color: var(--accent); font-weight: 700; }
  /* ---------- 表格 ---------- */
  /* .table-wrap 必须由生成端包在 <table> 外层：table 有 min-width，
     手机视口下必然超宽，而父级 .card 是 overflow:hidden —— 少了这层容器，
     超出的列会被直接裁掉（看不到也滑不动）。小屏另有堆叠布局，见文件末尾。 */
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0.6rem 0; }
  table { width: 100%; border-collapse: collapse; font-size: 0.78rem; margin: 0; min-width: 500px; }
  th, td { padding: 0.5rem 0.45rem; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; overflow-wrap: anywhere; }
  th { background: #f8fafc; font-weight: 600; color: var(--text2); }
  tr:hover { background: #f8fafc; }
  .up { color: var(--up); font-weight: 600; }
  .down { color: var(--down); font-weight: 600; }
  .warn { color: var(--warn); font-weight: 600; }
  .source { font-size: 0.75rem; color: #94a3b8; margin-top: 0.5rem; }
  /* ---------- 页脚 ---------- */
  .join-card {
    background: linear-gradient(135deg, #ecfdf5 0%, #eff6ff 100%);
    border: 1px solid var(--border); border-radius: 14px;
    padding: 1.1rem; margin-bottom: 1rem; text-align: center;
  }
  .join-card h3 { font-size: 0.98rem; color: var(--text); margin-bottom: 0.3rem; }
  .join-card p { font-size: 0.82rem; color: var(--text2); margin-bottom: 0.7rem; }
  .join-card .btn {
    display: inline-block; padding: 0.5rem 1.3rem; border-radius: 2rem;
    background: linear-gradient(135deg, #0f766e 0%, #2563eb 100%);
    color: #fff; font-size: 0.85rem; text-decoration: none;
  }
  .footer { text-align: center; font-size: 0.74rem; color: var(--text3); margin-top: 1.6rem; padding: 1rem; }
  @media (max-width: 480px) {
    .header h1 { font-size: 1.45rem; }
    .card { padding: 1rem 0.9rem; }
    .card h2 { font-size: 0.98rem; }
  }
  /* ---------- 小屏表格：三列横滑体验差，改为「堆叠卡片」竖排 ----------
     每行变成一张小卡，字段名由生成端写入的 data-label 提供，
     信息完整可见、无需左右滑动。>640px 仍保留表格 + 横向滚动。 */
  @media (max-width: 640px) {
    .table-wrap { overflow-x: visible; }
    .table-wrap table { min-width: 0; width: 100%; font-size: 0.82rem; }
    .table-wrap thead { display: none; }
    .table-wrap tbody,
    .table-wrap tr,
    .table-wrap td { display: block; width: 100%; }
    .table-wrap tr {
      border: 1px solid var(--border); border-radius: 10px;
      padding: 0.62rem 0.72rem 0.42rem; margin-bottom: 0.5rem; background: #fbfcfe;
    }
    .table-wrap tr:last-child { margin-bottom: 0; }
    .table-wrap tr:hover { background: #fbfcfe; }
    .table-wrap td { border: none; padding: 0.22rem 0; }
    .table-wrap td::before {
      content: attr(data-label); display: block;
      font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em;
      color: var(--text3); margin-bottom: 0.06rem;
    }
    .table-wrap td:first-child {
      font-weight: 700; color: var(--text); font-size: 0.86rem;
      padding-bottom: 0.32rem; margin-bottom: 0.28rem;
      border-bottom: 1px dashed var(--border);
    }
  }