:root {
  color-scheme: dark;
  --bg: #10182c;
  --panel: rgba(7, 14, 27, 0.88);
  --text: #f4f8ff;
  --muted: #acbfd8;
  --accent: #ffd15e;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; font-family: "Segoe UI", sans-serif; background: linear-gradient(180deg, #1a2845 0%, #0e1628 100%); color: var(--text); }
body { padding: 24px; }
.shell { max-width: 1400px; margin: 0 auto; }
.hero { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.eyebrow { margin: 0 0 10px; color: var(--accent); text-transform: uppercase; letter-spacing: .22em; font-size: .74rem; font-weight: 700; }
h1 { margin: 0 0 14px; font-size: clamp(2.2rem, 4vw, 4rem); }
.lede, .hud-card p:last-child, .controls { color: var(--muted); line-height: 1.7; }
.controls { display: grid; gap: 8px; text-align: right; }
.layout { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(260px, .55fr); gap: 22px; }
.road-frame, .hud-card { border: 1px solid rgba(255,255,255,.08); background: var(--panel); border-radius: 26px; box-shadow: 0 24px 50px rgba(0,0,0,.24); }
.road-frame { padding: 16px; }
#roadCanvas { width: 100%; height: auto; display: block; border-radius: 18px; background: #0f182c; }
.hud { display: grid; gap: 18px; }
.hud-card { padding: 20px; }
.site-footer { padding: 24px 4px 8px; color: var(--muted); font-size: .92rem; }
.metric { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-top: 1px solid rgba(255,255,255,.08); }
.metric:first-of-type { border-top: 0; }
.metric span { color: var(--muted); text-transform: uppercase; letter-spacing: .12em; font-size: .76rem; }
.metric strong { font-size: 1.2rem; }
@media (max-width: 980px) { body { padding: 16px; } .hero, .layout { display: grid; grid-template-columns: 1fr; } .controls { text-align: left; } }