*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2332;
  --bg-card-hover: #1f2b3d;
  --border-color: #2a3a50;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #22d3ee;
  --accent-glow: rgba(34, 211, 238, 0.3);
  --accent-alt: #a78bfa;
  --danger: #f43f5e;
  --success: #10b981;
  --warning: #f59e0b;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.container {
  width: 100%;
  max-width: 960px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  background: linear-gradient(135deg, var(--accent), var(--accent-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
}

.game-layout {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  width: 100%;
  justify-content: center;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 140px;
  flex-shrink: 0;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 0.75rem;
  text-align: center;
  transition: border-color 0.2s;
}

.info-card:hover {
  border-color: var(--accent);
}

.info-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.375rem;
}

.info-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.progress-bar {
  height: 8px;
  background: var(--bg-primary);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.25rem;
}

.progress-fill {
  height: 100%;
  width: 10%;
  background: linear-gradient(90deg, var(--accent), var(--accent-alt));
  border-radius: 4px;
  transition: width 0.3s ease;
}

.preview-box {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 0.25rem;
}

#previewCanvas {
  border-radius: 8px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
}

.controls-card {
  font-size: 0.8rem;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin: 0.5rem 0;
}

.key {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 4px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.controls-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Game area */
.game-area {
  position: relative;
  flex-shrink: 0;
}

#gameCanvas {
  display: block;
  border-radius: var(--radius);
  border: 2px solid var(--border-color);
  background: var(--bg-secondary);
  box-shadow: var(--shadow), 0 0 40px rgba(34, 211, 238, 0.05);
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(6px);
  border-radius: var(--radius);
  z-index: 10;
  opacity: 1;
  transition: opacity 0.3s;
}

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

.overlay-content {
  text-align: center;
  padding: 2rem;
}

.overlay-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.overlay-content h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.overlay-content p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}

.btn-start {
  background: linear-gradient(135deg, var(--accent), var(--accent-alt));
  color: var(--bg-primary);
  border: none;
  padding: 0.75rem 2rem;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-start:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px var(--accent-glow);
}

.btn-start:active {
  transform: scale(0.97);
}

/* Mobile D-Pad */
.mobile-controls {
  display: none;
  justify-content: center;
  margin-top: 0.5rem;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 56px);
  grid-template-rows: repeat(3, 56px);
  gap: 4px;
}

.dpad-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.dpad-btn:active {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

.dpad-up { grid-column: 2; grid-row: 1; }
.dpad-left { grid-column: 1; grid-row: 2; }
.dpad-center { grid-column: 2; grid-row: 2; font-size: 1rem; }
.dpad-right { grid-column: 3; grid-row: 2; }
.dpad-down { grid-column: 2; grid-row: 3; }

.footer {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-align: center;
  padding: 0.5rem 0;
}

/* Animations */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.score-pop {
  animation: scorePop 0.3s ease-out;
}

@keyframes scorePop {
  0% { transform: scale(1); }
  50% { transform: scale(1.3); color: var(--warning); }
  100% { transform: scale(1); }
}

/* Responsive */
@media (max-width: 820px) {
  .sidebar {
    display: none;
  }

  .game-layout {
    flex-direction: column;
    align-items: center;
  }

  .game-layout::before {
    content: '';
    display: flex;
    width: 100%;
    justify-content: center;
  }

  .container {
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .mobile-controls {
    display: flex;
  }

  .header h1 {
    font-size: 1.25rem;
  }
}

/* Mobile info bar shown when sidebars hidden */
.mobile-info-bar {
  display: none;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
}

.mobile-info-bar .mobile-stat {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.375rem 0.75rem;
  text-align: center;
  font-size: 0.8rem;
}

.mobile-info-bar .mobile-stat .stat-label {
  color: var(--text-secondary);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mobile-info-bar .mobile-stat .stat-value {
  color: var(--accent);
  font-weight: 700;
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 820px) {
  .mobile-info-bar {
    display: flex;
  }
}