:root {
  --bg: #070a0e;
  --panel: #0f141b;
  --line: #1c2430;
  --ink: #e7ecf2;
  --muted: #8794a6;
  --accent: #2f7cf6;
  --amber: #f59e0b;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 "Inter", "Segoe UI", system-ui, sans-serif; }
h1, h2, h3 { margin: 0; letter-spacing: -0.01em; }
a { color: var(--ink); }

.top { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; padding: 22px 28px 16px; border-bottom: 1px solid var(--line); }
.top h1 { font-size: 22px; }
.top p { margin: 4px 0 0; color: var(--muted); }
.by { color: var(--muted); text-decoration: none; font-size: 13px; }

.layout { display: grid; grid-template-columns: minmax(0, 800px) 360px; gap: 24px; padding: 24px 28px; justify-content: center; }
.stage { position: relative; }
#task { display: block; border-radius: 14px; border: 1px solid var(--line); cursor: none; touch-action: none; }
.overlay { position: absolute; left: 16px; right: 16px; bottom: 20px; max-width: 560px; padding: 12px 14px; background: rgba(15, 20, 27, 0.88); border: 1px solid var(--line); border-radius: 10px; color: var(--muted); font-size: 14px; pointer-events: none; }
.overlay b { color: var(--ink); }

.panel { display: flex; flex-direction: column; gap: 16px; }
.buttons { display: flex; gap: 10px; }
button { flex: 1; padding: 11px 14px; border-radius: 10px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); font: 600 14px inherit; font-family: inherit; cursor: pointer; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button:disabled { opacity: 0.4; cursor: default; }

.metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 0; }
.metrics div { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; }
.metrics .wide { grid-column: 1 / -1; }
.metrics dt { color: var(--muted); font-size: 12px; }
.metrics dd { margin: 2px 0 0; font-variant-numeric: tabular-nums; font-weight: 600; }
.metrics dd.big { font-size: 22px; color: var(--accent); }

.controls { display: grid; gap: 10px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
.controls label { display: grid; grid-template-columns: 1fr auto; gap: 4px 8px; font-size: 13px; color: var(--muted); }
.controls output { color: var(--ink); font-variant-numeric: tabular-nums; }
.controls input[type="range"] { grid-column: 1 / -1; width: 100%; accent-color: var(--accent); }
.controls select { grid-column: 1 / -1; width: 100%; padding: 6px 8px; border-radius: 6px; border: 1px solid var(--line); background: var(--bg, #0b0f14); color: var(--ink); font: inherit; }
.controls .check { display: flex; align-items: center; gap: 8px; }
.controls .check input { accent-color: var(--accent); }

figure { margin: 0; }
figcaption { color: var(--muted); font-size: 12px; margin-bottom: 6px; }
figcaption .x { color: var(--accent); }
figcaption .y { color: var(--amber); }
.raster, .trace { display: block; width: 100%; border-radius: 10px; border: 1px solid var(--line); background: #0b0f14; }
.raster { height: 160px; }
.trace { height: 120px; }

.about { max-width: 1184px; margin: 0 auto; padding: 8px 28px 48px; }
.about h2 { font-size: 18px; margin-bottom: 14px; }
.about .cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.about h3 { font-size: 14px; margin-bottom: 6px; }
.about p { margin: 0; color: var(--muted); font-size: 14px; }

@media (max-width: 1220px) {
  .layout { grid-template-columns: 1fr; }
  .about .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .about .cols { grid-template-columns: 1fr; }
  .top, .layout, .about { padding-left: 14px; padding-right: 14px; }
}