:root {
  --bg: #070b16;
  --panel: #0f1526;
  --line: #222b44;
  --text: #e6ebf5;
  --muted: #94a0bb;
  --glow: #33ff99;
  --level: #33ff33;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(120% 60% at 50% -10%, rgba(51, 255, 153, 0.12), transparent 60%),
    var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
}

main { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }

h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; }
h2 { margin: 0 0 4px; font-size: 1.05rem; }
.lede { margin: 4px 0 24px; color: var(--muted); }
.note { margin: 0 0 16px; color: var(--muted); font-size: 0.9rem; }
.meta { margin: 8px 0 0; color: var(--muted); font-size: 0.8rem; }
a { color: var(--glow); }

.status {
  border: 2px solid var(--level);
  border-radius: 14px;
  padding: 20px;
  background: color-mix(in srgb, var(--level) 10%, var(--panel));
  margin-bottom: 20px;
}
.status-level { display: flex; align-items: center; gap: 12px; font-size: 1.5rem; font-weight: 700; }
.dot {
  width: 20px; height: 20px; border-radius: 50%; flex: none;
  background: var(--level);
  box-shadow: 0 0 16px var(--level);
}
.status-meaning { margin: 10px 0 0; font-size: 1.05rem; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 20px;
}

.bands { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.bands li { display: grid; grid-template-columns: minmax(0, 11rem) 1fr 3rem; align-items: center; gap: 10px; font-size: 0.9rem; }
.bands .place { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bands .track { height: 12px; border-radius: 6px; background: #1a2238; overflow: hidden; }
.bands .fill { height: 100%; border-radius: 6px; background: linear-gradient(90deg, #1fae74, var(--glow)); box-shadow: 0 0 10px rgba(51, 255, 153, 0.5); }
.bands .pct { text-align: right; font-variant-numeric: tabular-nums; color: var(--muted); }

.chart svg { display: block; width: 100%; height: auto; }
.chart text { fill: var(--muted); font-size: 11px; }
.chart .grid { stroke: var(--line); }
.chart .threshold { stroke-dasharray: 4 4; stroke-width: 1; }

.legend { margin: 8px 0 0; font-size: 0.8rem; color: var(--muted); }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin: 0 4px 0 12px; vertical-align: -1px; }
.sw:first-child { margin-left: 0; }
.sw.observed { background: #7aa2ff; }
.sw.predicted { background: #7aa2ff55; outline: 1px dashed #7aa2ff; }

.tips ul { margin: 8px 0 0; padding-left: 1.2em; }
.tips li { margin-bottom: 4px; }

footer { color: var(--muted); font-size: 0.8rem; margin-top: 32px; }
footer p { margin: 0 0 6px; }

@media (max-width: 480px) {
  .bands li { grid-template-columns: 7.5rem 1fr 2.5rem; }
  .status-level { font-size: 1.25rem; }
}