:root {
  --bg-0: #0a0a1a;
  --bg-1: #12122a;
  --bg-2: #1b1b38;
  --fg: #e9e9ff;
  --muted: #9a9ac4;
  --accent: #7c5cff;
  --accent-2: #22d3ee;
  --danger: #ff5577;
  --grid: rgba(255, 255, 255, 0.05);
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(124, 92, 255, 0.25), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(34, 211, 238, 0.18), transparent 60%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.header {
  text-align: center;
}

.title {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 900;
  letter-spacing: 0.2em;
  margin: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 40px rgba(124, 92, 255, 0.35);
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.game {
  display: grid;
  grid-template-columns: 220px auto 220px;
  gap: 18px;
  align-items: start;
  justify-content: center;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 14px;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--muted);
  text-transform: uppercase;
}

.card canvas {
  width: 100%;
  height: auto;
  display: block;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 10px;
}

.card .hint {
  margin: 8px 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 14px;
}

.stats h2 { grid-column: 1 / -1; }

.stat {
  display: flex;
  flex-direction: column;
  padding: 10px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--card-border);
}

.stat-label {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

.stat-value {
  font-size: 22px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  margin-top: 4px;
}

.controls ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.controls li { display: flex; align-items: center; gap: 8px; }

kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--fg);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.4);
}

.board-wrap {
  position: relative;
  width: min(92vw, 360px);
  margin: 0 auto;
  aspect-ratio: 1 / 2;
  border-radius: 16px;
  padding: 8px;
  background:
    linear-gradient(180deg, rgba(124, 92, 255, 0.25), rgba(34, 211, 238, 0.12)) border-box;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow), 0 0 60px rgba(124, 92, 255, 0.18);
}

#board {
  width: 100%;
  height: 100%;
  display: block;
  background: #07071a;
  border-radius: 10px;
}

.overlay {
  position: absolute;
  inset: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(7, 7, 26, 0.78);
  backdrop-filter: blur(6px);
  border-radius: 10px;
  transition: opacity 0.2s ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.overlay-inner {
  text-align: center;
  padding: 20px 24px;
}

.overlay-inner h2 {
  margin: 0 0 8px;
  font-size: 26px;
  letter-spacing: 0.08em;
}

.overlay-inner p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 14px;
}

.btn {
  appearance: none;
  border: none;
  cursor: pointer;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 13px;
  color: white;
  transition: transform 0.08s ease, filter 0.2s ease;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 30px rgba(124, 92, 255, 0.35);
}

.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(1px); }

.mobile-controls {
  display: none;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-top: 6px;
}

.mbtn {
  appearance: none;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--fg);
  border-radius: 12px;
  padding: 14px 0;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.mbtn.wide { grid-column: span 2; }
.mbtn:active { background: rgba(255, 255, 255, 0.08); }

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.footer a {
  color: var(--accent-2);
  text-decoration: none;
}

.footer a:hover { text-decoration: underline; }

@media (max-width: 860px) {
  .game {
    grid-template-columns: 1fr;
  }
  .panel.left, .panel.right {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }
  .panel .card { flex: 1 1 160px; min-width: 160px; }
  .mobile-controls { display: grid; }
}

@media (max-width: 420px) {
  .panel .card { min-width: 140px; }
  .stats { grid-template-columns: 1fr 1fr; }
}