* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, Arial, sans-serif; background: #0f1115; color: #eee; }
header { padding: 12px 16px; border-bottom: 1px solid #222; }
h1 { margin: 0; font-size: 24px; }
.sub { margin: 4px 0 0; color: #aaa; font-size: 14px; }

.controls { padding: 12px 16px; border-bottom: 1px solid #222; }
.controls .row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; flex-wrap: wrap; }
.controls input { background: #1a1f29; border: 1px solid #333; color: #eee; padding: 8px; border-radius: 8px; }
.controls button { background: #2d6cdf; border: none; color: white; padding: 8px 12px; border-radius: 10px; cursor: pointer; }
.controls button:hover { filter: brightness(1.1); }
.controls .tiny { font-size: 12px; color: #bbb; }

.board-wrap {
  display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 12px; padding: 12px;
}
#board { width: 100%; aspect-ratio: 1 / 1; }
.sidebar { display: flex; flex-direction: column; gap: 12px; }
.who, .how { background: #121621; border: 1px solid #1f2430; border-radius: 12px; padding: 10px; color: #cbd5e1; }
ol { margin: 6px 0 0 18px; }

@media (max-width: 900px) {
  .board-wrap { grid-template-columns: 1fr; }
}