:root {
  --bg: #f4f7fa;
  --card: #ffffff;
  --text: #14202b;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #1d7fd6;
  --accent-soft: #cfe5f8;
  --warn: #b45309;
  --err: #b91c1c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d141b;
    --card: #16202a;
    --text: #e6edf3;
    --muted: #8b9bb0;
    --line: #253241;
    --accent: #4aa8f0;
    --accent-soft: #1f3a52;
    --warn: #f0b35a;
    --err: #f87171;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 960px; margin: 0 auto; padding: 20px 16px 40px; }
header { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
h1 { font-size: 24px; margin: 0; }
h2 { font-size: 16px; margin: 0; }
.status { color: var(--muted); font-size: 13px; }
.tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 12px; }
@media (max-width: 720px) { .tiles { grid-template-columns: repeat(2, 1fr); } }
.tile, .card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.label { color: var(--muted); font-size: 13px; }
.value { font-size: 26px; font-weight: 650; font-variant-numeric: tabular-nums; margin-top: 2px; }
.value small { font-size: 15px; font-weight: 500; color: var(--muted); margin-left: 3px; }
.sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.tabs { display: flex; gap: 4px; background: var(--bg); border-radius: 8px; padding: 3px; }
.tabs button {
  border: 0; background: transparent; color: var(--muted); font: inherit; font-size: 13px;
  padding: 5px 10px; border-radius: 6px; cursor: pointer;
}
.tabs button.active { background: var(--card); color: var(--text); box-shadow: 0 1px 2px rgba(0,0,0,.12); }
.chart { position: relative; width: 100%; height: 260px; }
.chart svg { display: block; width: 100%; height: 100%; overflow: visible; }
.chart .bar { fill: var(--accent); }
.chart .bar:hover { fill: var(--text); }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .axis { fill: var(--muted); font-size: 11px; }
.chart .empty { fill: var(--muted); font-size: 14px; }
.tip {
  position: absolute; pointer-events: none; background: var(--text); color: var(--card);
  padding: 4px 8px; border-radius: 6px; font-size: 12px; white-space: nowrap; transform: translate(-50%, -110%);
}
.chart-foot { color: var(--muted); font-size: 12px; margin-top: 8px; }
.note { color: var(--muted); font-size: 13px; }
.note.warn { color: var(--warn); }
.error { color: var(--err); font-size: 13px; }
.login { min-height: 100vh; display: grid; place-items: center; }
.login form { width: 100%; max-width: 320px; display: grid; gap: 10px; padding: 24px; }
.login h1 { margin-bottom: 6px; }
.login label { color: var(--muted); font-size: 13px; }
.login input, .login button { font: inherit; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); }
.login input { background: var(--bg); color: var(--text); }
.login button { background: var(--accent); color: #fff; border: 0; cursor: pointer; font-weight: 600; }
.logout { background: none; border: 0; color: var(--muted); font: inherit; font-size: 13px; cursor: pointer; text-decoration: underline; padding: 0; margin-left: 8px; }