*{box-sizing:border-box}:root{--bg-body: #0a0a0f;--bg-card: #13131a;--bg-arena: #1a1a2e;--bg-input: #0d0d14;--border: #2a2a3e;--text: #e0e0e8;--text-dim: #8888a0;--player-blue: #4a9eff;--enemy-red: #ff4444;--gold: #ffd700;--heal-green: #44ff88;--boss-purple: #cc44ff;--font-pixel: "Press Start 2P", monospace;--sprite-player: 72px;--sprite-enemy: 64px;--sprite-boss: 88px;--sprite-chest-w: 56px;--sprite-chest-h: 42px;--sprite-shop-w: 56px;--sprite-shop-h: 52px}body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;font-family:monospace;background:var(--bg-body);color:var(--text)}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:4px;padding:1.5rem;width:100%;max-width:420px;box-shadow:0 0 30px #00000080}.card-in-run{min-height:420px}.card h1{margin:0 0 1.5rem;font-family:var(--font-pixel);font-size:1rem;color:var(--player-blue);text-shadow:0 0 10px 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