*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:radial-gradient(circle at top,#1b1f3b,#0c0f1f 70%);color:#f8fafc;min-height:100vh;display:flex;justify-content:center;align-items:center;padding:20px}.game-container{width:100%;max-width:1100px}.game-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.back-link{color:#cbd5f5;text-decoration:none;background:#ffffff14;padding:10px 18px;border-radius:10px}h1{font-size:2.4rem}.hud{display:flex;align-items:center;gap:20px;margin-bottom:20px}.toggle{display:inline-flex;align-items:center;gap:10px;background:#ffffff14;padding:8px 14px;border-radius:999px;font-weight:600;cursor:pointer}.toggle input{display:none}.slider{width:42px;height:22px;border-radius:999px;background:#94a3b866;position:relative;transition:background .2s ease}.slider:after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#f8fafc;transition:transform .2s ease}.toggle input:checked+.slider{background:#6366f1cc}.toggle input:checked+.slider:after{transform:translate(20px)}.toggle-label{font-size:.9rem;color:#e2e8f0}.hud-item{background:#ffffff14;padding:12px 20px;border-radius:12px;font-weight:600}.btn{border:none;border-radius:10px;padding:12px 20px;font-weight:600;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;cursor:pointer}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:linear-gradient(135deg,#0ea5e9,#38bdf8)}.btn-small{padding:8px 12px;font-size:.9rem;width:100%}.btn-danger{background:linear-gradient(135deg,#ef4444,#f97316)}.game-layout{display:grid;grid-template-columns:1fr 240px;gap:20px}.game-area{position:relative;background:#ffffff0d;border-radius:16px;overflow:hidden}#game-canvas{width:100%;height:600px;display:block;background:#0f172a}.sidebar{display:flex;flex-direction:column;gap:16px}.panel{background:#ffffff14;border-radius:12px;padding:16px}.panel h3{margin-bottom:12px;font-size:1rem;text-transform:uppercase;letter-spacing:1px}.tower-btn{width:100%;padding:10px 12px;margin-bottom:10px;border-radius:10px;border:1px solid transparent;background:#ffffff14;color:#e2e8f0;cursor:pointer}.tower-btn.active{border-color:#a5b4fc;background:#6366f14d}.tower-list{display:flex;flex-direction:column;gap:10px}.tower-btn.locked{opacity:.5;cursor:not-allowed}.selected-actions{display:flex;flex-direction:column;gap:10px;margin-top:12px}.upgrade-list{display:flex;flex-direction:column;gap:12px;margin:20px 0}.upgrade-card{background:#ffffff14;border-radius:12px;padding:12px;text-align:left}.upgrade-card h4{margin-bottom:8px}.upgrade-card p{font-size:.9rem;color:#cbd5f5;margin-bottom:10px}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0f172ad9;display:flex;align-items:center;justify-content:center;text-align:center}#upgrade-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20}.overlay.hidden{display:none}.hidden{display:none!important}.overlay-content{max-width:360px}.orientation-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#020617eb;z-index:9999;display:flex;align-items:center;justify-content:center;text-align:center;padding:20px}.orientation-card{background:#0f172af2;border:1px solid rgba(148,163,184,.4);border-radius:16px;padding:24px;max-width:320px;box-shadow:0 20px 40px #00000059}.orientation-card h2{margin-bottom:8px;font-size:1.4rem}.orientation-card p{color:#cbd5f5;margin-bottom:16px}.btn-rotate{background:linear-gradient(135deg,#6366f1,#8b5cf6);border:none;color:#fff;padding:10px 16px;border-radius:10px;font-weight:600;cursor:pointer}.overlay-content.overlay-wide{max-width:900px;max-height:80vh;overflow-y:auto}.track-selection-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin:20px 0;max-height:500px;overflow-y:auto;padding:10px;background:#0003;border-radius:10px}.track-card{background:linear-gradient(135deg,#6366f11a,#8b5cf61a);border:2px solid rgba(148,163,184,.3);border-radius:10px;padding:12px;cursor:pointer;transition:all .2s ease;text-align:center;position:relative}.track-card svg{width:100%;height:80px;margin-bottom:10px;background:#0000004d;border-radius:6px}.track-card h3{font-size:.95rem;margin-bottom:4px}.track-card .difficulty{font-size:.8rem;margin:4px 0;color:#fbbf24}.track-card .description{font-size:.75rem;color:#cbd5f5;line-height:1.3}.track-card:hover:not(.locked){transform:scale(1.05);border-color:#94a3b899;background:linear-gradient(135deg,#6366f133,#8b5cf633)}.track-card.selected{border-color:#a5b4fc;background:linear-gradient(135deg,#6366f166,#8b5cf666);box-shadow:0 0 20px #6366f14d}.track-card.locked{opacity:.5;cursor:not-allowed}.track-card.locked:after{content:"🔒";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:32px;opacity:.6}.controls{list-style:none;margin:20px 0;text-align:left}.controls li{margin:8px 0}.final-score{margin:20px 0;font-size:1.2rem}@media (max-width: 900px){.game-layout{grid-template-columns:1fr}.hud{flex-wrap:wrap}.track-selection{grid-template-columns:1fr}}