:root {
  --bg-deep: #0a0a12;
  --bg-panel: rgba(255, 255, 255, 0.04);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --text-primary: #f0f0f5;
  --text-muted: #8888a0;
  --accent-cyan: #00e5ff;
  --font: 'Outfit', system-ui, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow: hidden;
}

.game-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.game-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--accent-cyan);
}

.game-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.game-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 1rem;
}

.canvas-wrapper {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  box-shadow:
    0 0 60px rgba(0, 229, 255, 0.06),
    0 20px 60px rgba(0, 0, 0, 0.5);
}

#game-canvas {
  display: block;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 18, 0.75);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.overlay--hidden {
  display: none;
}

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

.overlay-content h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.overlay-content p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.btn-start {
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 100px;
  background: linear-gradient(135deg, #00e5ff, #0099cc);
  color: #0a0a12;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-start:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.4);
}

.hud {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 140px;
}

.hud-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
}

.hud-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.hud-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.hud-panel--next canvas {
  display: block;
  margin: 0.5rem auto 0;
}

.controls-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1rem;
}

.controls-panel ul {
  list-style: none;
  margin-top: 0.5rem;
}

.controls-panel li {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.3rem 0;
}

kbd {
  display: inline-block;
  font-family: var(--font);
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  margin-right: 0.2rem;
}

@media (max-width: 900px) {
  .game-container {
    flex-direction: column;
    gap: 1rem;
  }

  .hud--left {
    flex-direction: row;
    min-width: unset;
  }

  .hud--right {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }

  .controls-panel {
    display: none;
  }
}