:root {
  --bg: #f4f6fa;
  --card: #ffffff;
  --text: #16202e;
  --muted: #6b7789;
  --line: #e4e9f0;
  --accent: #2f6df6;
  --ok: #17b26a;
  --warn: #e8912a;
  --bad: #e5484d;
  --shadow: 0 1px 2px rgba(16,24,40,.05), 0 8px 24px rgba(16,24,40,.06);
}
body[data-theme="dark"] {
  --bg: #0f141c;
  --card: #171e28;
  --text: #e6edf6;
  --muted: #8b98ab;
  --line: #263041;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
h1, h2, h3 { margin: 0; font-weight: 650; }
a { color: inherit; text-decoration: none; }

/* 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 12px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 9px; min-width: 0; }
.brand h1 { font-size: 17px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dot {
  width: 9px; height: 9px; border-radius: 50%; background: var(--muted); flex: none;
}
.dot.live { background: var(--ok); box-shadow: 0 0 0 4px rgba(23,178,106,.15); animation: pulse 2s infinite; }
.dot.stale { background: var(--warn); }
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .45 } }
.meta { display: flex; align-items: center; gap: 8px; }
.upd { color: var(--muted); font-size: 12.5px; }

.btn {
  border: 1px solid var(--line); background: var(--card); color: var(--text);
  border-radius: 9px; padding: 6px 11px; font-size: 13px; cursor: pointer;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); padding: 10px 14px; font-size: 15px; }
.btn.full { width: 100%; }
.btn.ghost { background: transparent; }

main { max-width: 1180px; margin: 0 auto; padding: 16px 14px 40px; }
section { margin-bottom: 22px; }
.sec-title { font-size: 15px; margin-bottom: 10px; color: var(--text); }
.sec-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.seg { display: inline-flex; background: var(--card); border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.seg button {
  border: 0; background: transparent; color: var(--muted);
  padding: 6px 12px; font-size: 13px; cursor: pointer;
}
.seg button.on { background: var(--accent); color: #fff; }
.chk { font-size: 12.5px; color: var(--muted); display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }

/* 总览卡 */
.cards {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
}
.scard {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 14px 15px; box-shadow: var(--shadow);
}
.scard .k { font-size: 12.5px; color: var(--muted); }
.scard .v { font-size: 25px; font-weight: 700; margin-top: 5px; letter-spacing: -.5px; }
.scard .v small { font-size: 13px; font-weight: 500; color: var(--muted); margin-left: 3px; }
.scard .sub { font-size: 12px; color: var(--muted); margin-top: 3px; }

/* 机柜卡 */
.rack-grid { display: grid; gap: 13px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.rack {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 15px; box-shadow: var(--shadow); border-top: 3px solid var(--rc, var(--accent));
}
.rack-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.rack-name { font-size: 15px; font-weight: 650; }
.rack-name span { color: var(--muted); font-weight: 500; font-size: 12.5px; margin-left: 6px; }
.rack-w { font-size: 27px; font-weight: 700; letter-spacing: -.5px; color: var(--rc, var(--accent)); }
.rack-w small { font-size: 13px; color: var(--muted); font-weight: 500; margin-left: 3px; }
.rack-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }
.rack-stats div { background: var(--bg); border-radius: 9px; padding: 7px 9px; }
.rack-stats .k { font-size: 11.5px; color: var(--muted); }
.rack-stats .v { font-size: 15px; font-weight: 650; }

.dev-toggle {
  margin-top: 12px; font-size: 12.5px; color: var(--muted); cursor: pointer;
  border-top: 1px dashed var(--line); padding-top: 9px; display: flex; justify-content: space-between;
}
.dev-list { margin-top: 6px; display: none; }
.dev-list.open { display: block; }
.dev {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 5px 0; font-size: 13px; border-bottom: 1px solid var(--line);
}
.dev:last-child { border-bottom: 0; }
.dev .nm { display: flex; align-items: center; gap: 6px; min-width: 0; }
.dev .nm b { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dev .w { font-variant-numeric: tabular-nums; color: var(--muted); white-space: nowrap; }
.tag { font-size: 10.5px; padding: 1px 5px; border-radius: 5px; background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
.tag.rated { color: var(--warn); border-color: var(--warn); }
.tag.off { color: var(--bad); border-color: var(--bad); }

/* 图表 */
.chart-box {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 10px 8px; box-shadow: var(--shadow);
}
.chart { width: 100%; height: 340px; }
.legend { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 9px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 20px; padding: 4px 11px;
  font-size: 12.5px; background: var(--card);
}
.chip i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.chip.off { opacity: .38; }

.foot { color: var(--muted); font-size: 12px; text-align: center; margin-top: 26px; }

/* 登录页 */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 30px 26px; width: min(90vw, 340px); box-shadow: var(--shadow); text-align: center;
}
.login-card h1 { font-size: 19px; }
.login-card .sub { color: var(--muted); font-size: 13px; margin: 6px 0 18px; }
.login-card input {
  width: 100%; padding: 11px 12px; font-size: 15px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg); color: var(--text); margin-bottom: 12px;
}
.err { color: var(--bad); font-size: 13px; min-height: 18px; }

@media (max-width: 640px) {
  .chart { height: 260px; }
  .scard .v { font-size: 22px; }
  .rack-w { font-size: 24px; }
  main { padding: 12px 10px 30px; }
  .upd { display: none; }
}