:root {
  --bg-dark: #0b0f19;
  --bg-panel: #111827;
  --bg-canvas: #0f172a;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.4);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --success: #10b981;
  --danger: #ef4444;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

body {
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-main);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.game-wrapper {
  width: 100%;
  max-width: 840px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ui-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: var(--bg-panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.score-board {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.score-board .label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.score-board .value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent-glow);
}

.canvas-container {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 2px solid rgba(255, 255, 255, 0.08);
  background: var(--bg-canvas);
  aspect-ratio: 4 / 3;
  width: 100%;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(6px);
  text-align: center;
  padding: 20px;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.overlay h1, .overlay h2 {
  font-size: 2.5rem;
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}

.overlay p {
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-size: 1rem;
}

.overlay .hint {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 24px;
}

button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px var(--accent-glow);
}

button:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
}

button:active {
  transform: translateY(0);
}

.controls-hint {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 8px;
}

@media (max-width: 768px) {
  .overlay h1, .overlay h2 { font-size: 1.8rem; }
  .controls-hint { gap: 12px; font-size: 0.75rem; }
}