:root {
  --panel-color: rgba(15, 23, 42, 0.82);
  --border-color: rgba(99, 102, 241, 0.25);
  --accent-color: #38bdf8;
  --accent-strong: #f97316;
  --text-color: #f8fafc;
  --muted-color: #94a3b8;
  --glow-color: rgba(59, 130, 246, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #020617 0%, #0f172a 100%);
  color: var(--text-color);
  font-family: 'Inter', 'Press Start 2P', ui-sans-serif, system-ui;
  line-height: 1.5;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 20px 48px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.top {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.title {
  margin: 0;
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: linear-gradient(120deg, var(--accent-color), var(--accent-strong));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 24px var(--glow-color);
}

.subtitle {
  margin: 0;
  color: var(--muted-color);
  font-size: 1rem;
}

.main {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 300px;
  gap: 24px;
}

.left {
  position: relative;
  padding: 18px;
  border-radius: 20px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.2);
  box-shadow: 0 22px 40px rgba(2, 6, 23, 0.55);
  display: flex;
  justify-content: center;
  align-items: center;
}

#board {
  width: 100%;
  max-width: 360px;
  height: auto;
  border-radius: 16px;
  border: 2px solid var(--border-color);
  background: transparent;
  image-rendering: pixelated;
}

.right {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel {
  background: var(--panel-color);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 18px 32px rgba(2, 6, 23, 0.45);
  backdrop-filter: blur(16px);
}

.panel .label {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-color);
  margin-bottom: 12px;
}

.panel.stats .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.panel.stats .row:last-child {
  border-bottom: none;
}

.panel.stats span {
  font-size: 0.85rem;
  color: var(--muted-color);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.panel.stats b {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-color);
}

.hint {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--muted-color);
  text-align: center;
}

canvas#nextA,
canvas#nextB,
canvas#hold {
  display: block;
  width: 100%;
  height: auto;
  margin: 8px auto;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(15, 23, 42, 0.78);
  image-rendering: pixelated;
}

.switch {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: var(--muted-color);
}

.switch input[type="checkbox"] {
  appearance: none;
  width: 52px;
  height: 26px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(148, 163, 184, 0.25);
  position: relative;
  cursor: pointer;
  transition: background 0.2s ease;
}

.switch input[type="checkbox"]::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 4px 10px rgba(15, 23, 42, 0.35);
  transition: transform 0.2s ease;
}

.switch input[type="checkbox"]:checked {
  background: linear-gradient(120deg, var(--accent-color), var(--accent-strong));
}

.switch input[type="checkbox"]:checked::before {
  transform: translateX(26px);
}

.controls {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.controls button,
.row.gap button {
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 10px;
  padding: 8px 0;
  background: rgba(15, 23, 42, 0.6);
  color: var(--text-color);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.controls button:hover,
.row.gap button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(2, 6, 23, 0.45);
}

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

button.primary {
  flex: 1;
  background: linear-gradient(120deg, var(--accent-color), var(--accent-strong));
  color: #0f172a;
  font-weight: 700;
  border: none;
}

button.secondary {
  flex: 1;
  background: rgba(15, 23, 42, 0.68);
}

.bottom {
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted-color);
}

.theme-panel {
  gap: 16px;
  display: flex;
  flex-direction: column;
}

.theme-swatches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
}

.theme-swatch {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(15, 23, 42, 0.55);
  color: var(--text-color);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.theme-swatch:hover {
  transform: translateY(-2px);
  border-color: var(--accent-color);
  box-shadow: 0 12px 20px rgba(2, 6, 23, 0.35);
}

.theme-swatch.active {
  border-color: var(--accent-strong);
  box-shadow: 0 12px 26px rgba(249, 115, 22, 0.35);
}

.theme-swatch .swatch-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.5);
}

.theme-swatch .swatch-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ghost-btn {
  border: 1px dashed rgba(148, 163, 184, 0.4);
  border-radius: 12px;
  padding: 10px 14px;
  background: transparent;
  color: var(--muted-color);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.ghost-btn.active {
  border-color: var(--accent-color);
  color: var(--text-color);
}

@media (max-width: 960px) {
  .main {
    grid-template-columns: 1fr;
  }

  .left {
    order: 0;
  }

  .right {
    order: 1;
  }
}

@media (max-width: 600px) {
  .wrap {
    padding: 24px 16px 48px;
  }

  .controls {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .row.gap {
    flex-direction: column;
  }
}

/* Game Over Modal */
.game-over-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

.game-over-modal .modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
}

.game-over-modal .modal-content {
  position: relative;
  background: var(--panel-color);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 32px;
  max-width: 480px;
  width: 90%;
  box-shadow: 0 32px 64px rgba(2, 6, 23, 0.7);
  backdrop-filter: blur(20px);
  text-align: center;
}

.game-over-modal h2 {
  margin: 0 0 24px 0;
  font-size: 2rem;
  background: linear-gradient(120deg, var(--accent-color), var(--accent-strong));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-item {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--muted-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-color);
}

.line-breakdown {
  margin: 20px 0;
  padding: 16px;
  background: rgba(15, 23, 42, 0.4);
  border-radius: 12px;
  color: var(--muted-color);
  font-size: 0.9rem;
}

.line-breakdown div {
  margin: 4px 0;
}

.modal-btn {
  padding: 14px 28px;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.modal-btn.primary {
  background: linear-gradient(120deg, var(--accent-color), var(--accent-strong));
  color: #0f172a;
}

.modal-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}