:root {
  --bg: #0b1220;
  --panel: #121b2e;
  --border: #1f2a40;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --hold: #fbbf24;
  --clear: #4ade80;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header, main, footer {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 16px;
}

header { padding-top: 32px; }

h1 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
h1 span { color: var(--accent); display: block; }

h2 { font-size: 1.35rem; margin: 0 0 12px; }
h3 { font-size: 1.05rem; margin: 28px 0 8px; color: var(--accent); }

.lede { color: var(--muted); margin: 0 0 24px; }

section { margin: 0 0 48px; }
section p, section li, section dd { max-width: 72ch; }

.sim {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  margin-bottom: 12px;
}
.controls label { display: flex; gap: 8px; align-items: center; color: var(--muted); font-size: 0.9rem; }
.controls .speed { flex: 1 1 180px; }
.controls .speed input { flex: 1; accent-color: var(--accent); }

select, button {
  font: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: #1b2539;
  border: 1px solid #2c3a55;
  border-radius: 8px;
  padding: 6px 12px;
}
button { cursor: pointer; min-width: 92px; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #04121f; border-color: var(--accent); font-weight: 600; }

canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 960 / 540;
  background: linear-gradient(#0d1729, #0a1120);
  border-radius: 8px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 8px;
  margin: 12px 0;
}
.stats div { background: #0e1626; border-radius: 8px; padding: 8px 12px; }
.stats dt { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stats dd { margin: 0; font: 600 1.2rem var(--mono); font-variant-numeric: tabular-nums; }

.atc h2 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 6px; }
#atc-log {
  list-style: none;
  margin: 0;
  padding: 8px 12px;
  background: #070d18;
  border-radius: 8px;
  font: 0.82rem/1.55 var(--mono);
  min-height: 9.5em;
  color: var(--muted);
}
#atc-log li { max-width: none; }
#atc-log li:first-child { color: var(--text); }
#atc-log .hold { color: var(--hold); }
#atc-log .clear { color: var(--clear); }

pre {
  background: #0e1626;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  overflow-x: auto;
  font: 0.88rem/1.5 var(--mono);
}
code { font-family: var(--mono); font-size: 0.92em; }
p code, li code, dd code { background: #16203a; padding: 1px 5px; border-radius: 4px; }

.howto { border-top: 1px solid var(--border); padding-top: 32px; }
.roles dt { font-weight: 600; margin-top: 12px; }
.roles dd { margin: 2px 0 0 0; color: #cbd5e1; }

a, a:visited { color: var(--accent); }
a:hover { color: var(--text); }

footer { color: var(--muted); font-size: 0.85rem; padding-bottom: 32px; }