:root {
    --bg: #f7f8fa; --surface: #ffffff; --ink: #1a1d21; --ink-secondary: #5c6370;
    --ink-muted: #8a919e; --border: #e3e6ea; --accent: #2563eb;
    --danger: #b91c1c; --danger-bg: #fef2f2; --row-hover: #f0f3f7;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --bg: #15181c; --surface: #1e2228; --ink: #e8eaed; --ink-secondary: #9aa2ad;
      --ink-muted: #6b7280; --border: #2e343c; --accent: #60a5fa;
      --danger: #f87171; --danger-bg: #2c1a1a; --row-hover: #262b33;
    }
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
      "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg); color: var(--ink); padding: 32px 16px;
  }
  .wrap { max-width: 860px; margin: 0 auto; }
  header { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
  h1 { font-size: 18px; font-weight: 600; }
  .sub { font-size: 13px; color: var(--ink-secondary); margin-top: 4px; }
  .controls { display: flex; gap: 8px; }
  button {
    font: inherit; font-size: 14px; font-weight: 500;
    color: var(--accent); background: var(--surface);
    border: 1px solid var(--border); border-radius: 8px;
    padding: 8px 16px; cursor: pointer;
  }
  button:hover { background: var(--row-hover); }
  button:disabled { color: var(--ink-muted); cursor: default; background: var(--surface); }
  .quiet { color: var(--ink-secondary); }

  .hero {
    background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
    padding: 24px 28px; margin: 20px 0;
  }
  .hero .label { font-size: 13px; color: var(--ink-secondary); }
  .hero .value { font-size: 52px; font-weight: 600; line-height: 1.15; margin-top: 6px; letter-spacing: -0.5px; }
  .hero .value .unit { font-size: 22px; font-weight: 500; color: var(--ink-secondary); margin-left: 8px; }
  .hero .meta { font-size: 13px; color: var(--ink-muted); margin-top: 8px; }
  .hero .meta .warn { color: var(--danger); }

  .card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; overflow-x: auto; }
  table { width: 100%; border-collapse: collapse; font-size: 14px; }
  th, td { padding: 10px 16px; text-align: left; white-space: nowrap; }
  th { font-size: 12px; font-weight: 500; color: var(--ink-secondary); border-bottom: 1px solid var(--border); }
  td { border-bottom: 1px solid var(--border); }
  tr:last-child td { border-bottom: none; }
  tbody tr:hover { background: var(--row-hover); }
  th.num, td.num { text-align: right; }
  td.num { font-variant-numeric: tabular-nums; }
  .addr { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }
  .addr a { color: var(--ink-secondary); text-decoration: none; }
  .addr a:hover { color: var(--accent); text-decoration: underline; }
  .zero, .pending { color: var(--ink-muted); }
  .err { color: var(--danger); background: var(--danger-bg); border-radius: 6px; padding: 2px 8px; font-size: 12px; }
  footer { font-size: 12px; color: var(--ink-muted); margin-top: 16px; line-height: 1.6; }

/* 底部 tab 栏 */
body { padding-bottom: 84px; }
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  display: flex; justify-content: space-around; align-items: stretch;
  background: var(--surface); border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar a {
  flex: 1; text-align: center; padding: 10px 4px 12px;
  font-size: 12px; color: var(--ink-secondary); text-decoration: none; line-height: 1.5;
}
.tabbar a .ico { display: block; font-size: 20px; }
.tabbar a.active { color: var(--accent); font-weight: 600; }
.tabbar a:hover { background: var(--row-hover); }