:root {
  --bg: #f4f5f7; --panel: #fff; --text: #1d2330; --muted: #667085; --line: #e3e6eb;
  --accent: #2563eb; --err: #b42318; --errbg: #fee4e2;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #12151c; --panel: #1b2029; --text: #e6e9ef; --muted: #98a2b3; --line: #2b3240;
          --accent: #5b8cff; --err: #fda29b; --errbg: #3b1d1b; }
}
* { 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; }
header { display: flex; align-items: center; gap: 16px; padding: 10px 20px; flex-wrap: wrap;
         background: var(--panel); border-bottom: 1px solid var(--line); }
header h1 { font-size: 18px; margin: 0; margin-right: auto; }
nav { display: flex; gap: 4px; }
button, .btn { font: inherit; border: 1px solid var(--line); background: var(--panel); color: var(--text);
               padding: 6px 12px; border-radius: 8px; cursor: pointer; text-decoration: none; display: inline-block; }
button:hover, .btn:hover { border-color: var(--accent); }
nav button.active, #apply, .btn { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.alt { background: var(--panel); color: var(--text); border-color: var(--line); }
button.ghost { background: transparent; }
#rangebar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; padding: 10px 20px;
            background: var(--panel); border-bottom: 1px solid var(--line); }
#rangebar[hidden], [hidden] { display: none !important; }
.presets { display: flex; gap: 4px; flex-wrap: wrap; }
input, select { font: inherit; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line);
                background: var(--panel); color: var(--text); }
main { max-width: 1200px; margin: 0 auto; padding: 16px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 16px; }
.panel h2 { font-size: 14px; color: var(--muted); font-weight: 600; margin: 0 0 10px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; margin-bottom: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.card .k { color: var(--muted); font-size: 13px; }
.card .v { font-size: 26px; font-weight: 650; }
.card .s { color: var(--muted); font-size: 12px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .grid2 { grid-template-columns: 1fr; } }
.chartbox { position: relative; height: 280px; }
.chartbox.tall { height: 420px; }
.controls { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 12px; }
.controls label { display: flex; gap: 6px; align-items: center; color: var(--muted); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; }
.note { color: var(--muted); font-size: 13px; margin: 8px 0 0; }
.err { background: var(--errbg); color: var(--err); padding: 10px 20px; }
body.login { display: grid; place-items: center; min-height: 100vh; }
.loginbox { width: 320px; display: grid; gap: 10px; }
.loginbox h1 { font-size: 20px; margin: 0 0 4px; }
.loginbox .err { border-radius: 8px; padding: 8px 10px; margin: 0; }
.loginbox button { background: var(--accent); border-color: var(--accent); color: #fff; }
.who { color: var(--muted); font-size: 13px; }
td .actions, #users-table td:last-child { white-space: nowrap; text-align: right; }
#users-table button { padding: 3px 8px; font-size: 13px; }
.controls input { min-width: 200px; }
.scroll { max-height: 360px; overflow: auto; }
.muted { color: var(--muted); font-size: 12px; }
th { position: sticky; top: 0; background: var(--panel); }