:root {
  --bg: #0f1419;
  --panel: #1a212b;
  --panel-border: #2a3441;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #4cc2ff;
  --accent-press: #2aa3e0;
  --warn: #d29922;
  --bad: #f85149;
  --good: #3fb950;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header, main, footer { max-width: 1160px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 32px; }

h1 { margin: 0 0 8px; font-size: 1.9rem; }
.subtitle { color: var(--muted); max-width: 84ch; }
.subtitle a { color: var(--accent); }

.repo-link { margin: 6px 0 0; font-size: 0.85rem; }
.repo-link a { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); text-decoration: none; }
.repo-link a:hover { color: var(--accent); }
.repo-link svg { display: block; }

.status {
  display: inline-block; margin-top: 8px; padding: 6px 12px;
  border-radius: 999px; font-size: 0.85rem; font-weight: 600;
}
.status--loading { background: #3a2f12; color: var(--warn); }
.status--ready   { background: #12331c; color: var(--good); }
.status--busy    { background: #12283a; color: var(--accent); }
.status--error   { background: #3a1414; color: var(--bad); }

main { display: grid; grid-template-columns: 300px 1fr; gap: 20px; margin-top: 24px; }
@media (max-width: 880px) { main { grid-template-columns: 1fr; } }

.panel {
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: 12px; padding: 20px;
}
.panel h2 { margin-top: 0; font-size: 1.1rem; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.muted { color: var(--muted); font-weight: 400; }
.small { font-size: 0.8rem; margin: 4px 0 0; }

input[type="number"], select, input[type="range"] { width: 100%; }
input[type="number"], select {
  background: #0f1620; border: 1px solid var(--panel-border); color: var(--text);
  border-radius: 8px; padding: 8px 10px; font-size: 0.95rem;
}
input[type="range"] { accent-color: var(--accent); }
#spread-out, #weekend-out { font-variant-numeric: tabular-nums; color: var(--muted); }

.btn {
  font: inherit; font-weight: 600; border-radius: 8px; padding: 9px 16px;
  cursor: pointer; border: 1px solid transparent; transition: background .15s, opacity .15s;
}
.btn--primary { background: var(--accent); color: #04121c; width: 100%; }
.btn--primary:hover:not(:disabled) { background: var(--accent-press); }
.btn--primary:disabled { opacity: .5; cursor: not-allowed; }

.hint { color: var(--muted); font-style: italic; }

.chart-wrap { width: 100%; overflow-x: auto; }
#chart { width: 100%; height: auto; border-radius: 8px; background: #fff; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 16px 0 0; }
.stat { background: #0f1620; border: 1px solid var(--panel-border); border-radius: 10px; padding: 12px 14px; }
.stat .v { font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .l { color: var(--muted); font-size: 0.78rem; margin-top: 2px; }
.stat--avg .v { color: var(--accent); }
.stat--p85 .v { color: var(--warn); }
.stat--peak .v { color: var(--bad); }

.takeaway {
  margin-top: 16px; padding: 12px 14px; background: #0f1620;
  border-left: 3px solid var(--accent); border-radius: 6px; font-size: 0.95rem;
}

footer { padding: 24px 20px 40px; color: var(--muted); font-size: 0.85rem; }
footer code { color: var(--accent); }