/* Minimal, modern, responsive UI */
:root {
  --bg0: #0b1020;
  --bg1: #0f1730;
  --card: rgba(255, 255, 255, 0.06);
  --card2: rgba(255, 255, 255, 0.09);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.66);
  --muted2: rgba(255, 255, 255, 0.52);
  --stroke: rgba(255, 255, 255, 0.12);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --accent: #7c5cff;
  --accent2: #22d3ee;
  --danger: #ff4d6d;
  --radius: 18px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg0: #f6f7ff;
    --bg1: #eef1ff;
    --card: rgba(0, 0, 0, 0.04);
    --card2: rgba(0, 0, 0, 0.06);
    --text: rgba(18, 22, 44, 0.92);
    --muted: rgba(18, 22, 44, 0.68);
    --muted2: rgba(18, 22, 44, 0.52);
    --stroke: rgba(18, 22, 44, 0.12);
    --shadow: 0 24px 80px rgba(25, 35, 75, 0.18);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 650px at 20% 10%, rgba(124, 92, 255, 0.25), transparent 55%),
    radial-gradient(800px 600px at 90% 20%, rgba(34, 211, 238, 0.18), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}

.app {
  max-width: 1120px;
  padding: 18px;
  margin: 0 auto;
  min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 14px;
}

.topbar {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card), transparent);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.logo {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  background:
    radial-gradient(12px 12px at 28% 30%, rgba(255, 255, 255, 0.9), transparent 65%),
    radial-gradient(16px 16px at 70% 65%, rgba(255, 255, 255, 0.28), transparent 70%),
    linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 10px 30px rgba(124, 92, 255, 0.22);
}

.title .name {
  font-weight: 800;
  letter-spacing: 0.2px;
}

.title .sub {
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.stats {
  display: flex;
  gap: 10px;
}

.stat {
  min-width: 86px;
  padding: 8px 10px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: var(--card);
}

.statLabel {
  font-size: 11px;
  color: var(--muted2);
}

.statValue {
  margin-top: 2px;
  font-weight: 700;
}

.main {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 14px;
  align-items: start;
}

.boardCard {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, var(--card), transparent);
  box-shadow: var(--shadow);
  overflow: hidden;
}

canvas#board {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1 / 1;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(10, 14, 28, 0.62);
  backdrop-filter: blur(10px);
}

@media (prefers-color-scheme: light) {
  .overlay {
    background: rgba(238, 241, 255, 0.72);
  }
}

.overlay.hidden {
  display: none;
}

.overlayCard {
  width: min(520px, 100%);
  border-radius: 20px;
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, var(--card2), var(--card));
  padding: 16px;
  box-shadow: var(--shadow);
}

.overlayTitle {
  font-weight: 900;
  font-size: 22px;
}

.overlayDesc {
  margin-top: 6px;
  color: var(--muted);
}

.overlayActions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tips {
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
  display: grid;
  gap: 8px;
}

.tipRow {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid var(--stroke);
  background: var(--card);
  font-size: 12px;
  color: var(--text);
}

.side {
  display: grid;
  gap: 14px;
}

.panel {
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, var(--card), transparent);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panelTitle {
  padding: 12px 14px;
  font-weight: 800;
  border-bottom: 1px solid var(--stroke);
  color: var(--text);
}

.panelBody {
  padding: 14px;
  color: var(--muted);
}

.controls {
  display: grid;
  justify-content: center;
  gap: 10px;
}

.ctl {
  width: 64px;
  height: 52px;
  border-radius: 16px;
  border: 1px solid var(--stroke);
  background: radial-gradient(70px 60px at 30% 30%, rgba(255, 255, 255, 0.18), transparent 60%),
    linear-gradient(180deg, var(--card2), var(--card));
  color: var(--text);
  font-weight: 800;
  font-size: 18px;
  cursor: pointer;
  user-select: none;
}

.ctl:active {
  transform: translateY(1px);
}

.ctlRow {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.toggles {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: var(--card);
  color: var(--text);
}

.toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.actions {
  margin-top: 12px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, var(--card2), var(--card));
  color: var(--text);
  border-radius: 14px;
  padding: 10px 12px;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
}

.btn.primary {
  border-color: rgba(124, 92, 255, 0.55);
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.35), rgba(34, 211, 238, 0.22));
}

.btn.danger {
  border-color: rgba(255, 77, 109, 0.6);
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.22), rgba(255, 77, 109, 0.1));
}

.btn:active {
  transform: translateY(1px);
}

.rules {
  display: grid;
  gap: 10px;
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, var(--card), transparent);
  color: var(--muted);
  box-shadow: var(--shadow);
}

.footerLeft,
.footerRight {
  font-size: 12px;
}

@media (max-width: 980px) {
  .main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .stats {
    gap: 8px;
  }
  .stat {
    min-width: 74px;
  }
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .actions {
    flex-direction: column;
  }
}