:root {
  --bg: #f4f7ff;
  --surface: #ffffff;
  --text: #1f2a44;
  --muted: #4a5b84;
  --board: #1d4ed8;
  --p1: #ef4444;
  --p2: #fbbf24;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top, #dbeafe 0%, var(--bg) 55%, #eef2ff 100%);
  color: var(--text);
  min-height: 100vh;
}
.container { max-width: 720px; margin: 0 auto; padding: 20px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.topbar a { color: #ea580c; text-decoration: none; font-weight: 700; }
.topbar h1 { margin: 0; font-size: 2rem; }
.hud {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  background: var(--surface);
  border: 1px solid #c9d6f2;
  border-radius: 10px;
  padding: 10px;
  margin-bottom: 12px;
}
.hud p { margin: 0; color: var(--muted); }
button {
  border: none;
  border-radius: 8px;
  background: #ea580c;
  color: #fff;
  font-weight: 700;
  padding: 8px 12px;
  cursor: pointer;
}
.controls {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}
.drop-btn {
  background: #2563eb;
  padding: 10px 0;
}
.drop-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.board {
  background: var(--board);
  border-radius: 12px;
  padding: 10px;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  border: 1px solid #1e40af;
}
.cell {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: #dbeafe;
}
.cell.p1 { background: var(--p1); }
.cell.p2 { background: var(--p2); }
.status { margin-top: 10px; color: var(--muted); }