:root {
  --bg: radial-gradient(circle at 10% 10%, rgba(20, 184, 166, 0.35), transparent 55%),
        radial-gradient(circle at 80% 0%, rgba(244, 114, 182, 0.32), transparent 58%),
        linear-gradient(180deg, #020617 0%, #0f172a 100%);
  --surface: rgba(15, 23, 42, 0.72);
  --surface-solid: #0f172a;
  --card: rgba(30, 41, 59, 0.78);
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #f97316;
  --border: rgba(148, 163, 184, 0.25);
  --radius: 18px;
  --shadow: 0 18px 45px rgba(2, 6, 23, 0.55);
}

[data-theme="light"] {
  --bg: radial-gradient(circle at 10% 10%, rgba(56, 189, 248, 0.35), transparent 55%),
        radial-gradient(circle at 80% 0%, rgba(251, 191, 36, 0.32), transparent 58%),
        linear-gradient(180deg, #f1f5f9 0%, #dbeafe 100%);
  --surface: rgba(255, 255, 255, 0.92);
  --surface-solid: #ffffff;
  --card: rgba(241, 245, 249, 0.94);
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --accent-2: #f97316;
  --border: rgba(15, 23, 42, 0.12);
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.15);
}

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

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Press Start 2P', ui-sans-serif, system-ui;
  line-height: 1.6;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px;
  position: relative;
}

.game-header {
  text-align: center;
  margin-bottom: 36px;
}

.game-title {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(120deg, #38bdf8 0%, #f97316 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 24px rgba(56, 189, 248, 0.32);
}

.game-subtitle {
  color: var(--muted);
  font-size: 1.05rem;
}

.game-layout {
  display: grid;
  grid-template-columns: 280px 1fr 280px;
  gap: 28px;
  align-items: start;
}

.left-panel,
.right-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.info-card h3 {
  margin: 0 0 18px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
  color: var(--muted);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px;
}

.stat-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.stat-value {
  font-size: 1.3rem;
  font-weight: 700;
}

.power-ups {
  display: grid;
  gap: 10px;
}

.power-up-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.power-up-indicator.active {
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.25);
}

.power-up-indicator .icon {
  width: 16px;
  height: 16px;
  border-radius: 4px;
}

.game-canvas-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

#gameCanvas {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: var(--shadow);
  background: transparent;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.control-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-transform: uppercase;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.control-btn.primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  border-color: transparent;
  color: #0f172a;
  font-weight: 700;
}

.control-btn.secondary {
  background: var(--surface);
}

.control-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(56, 189, 248, 0.2);
}

.control-btn.hidden {
  display: none;
}

.mobile-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 6px;
}

.mobile-control-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 12px;
  border-radius: 12px;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.2s ease;
}

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

.element-grid {
  display: grid;
  gap: 12px;
}

.element-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--muted);
}

.element-swatch {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.swatch-food { background: #fca5a5; }
.swatch-golden { background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%); }
.swatch-power { background: #06b6d4; }
.swatch-obstacle { background: #7f1d1d; }

.instructions {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.instructions h2 {
  margin-bottom: 16px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 1rem;
}

.instructions ol {
  margin-left: 18px;
  margin-bottom: 18px;
  color: var(--muted);
}

.instructions li { margin-bottom: 6px; }

.theme-toggle {
  position: fixed;
  right: 18px;
  bottom: 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 10px 12px;
  box-shadow: var(--shadow);
  cursor: pointer;
}

@media (max-width: 1024px) {
  .game-layout {
    grid-template-columns: 1fr;
  }

  .left-panel,
  .right-panel {
    order: 1;
  }

  .game-canvas-container {
    order: 0;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 20px;
  }

  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }
}