.app-container{width:100%;height:100%;background:linear-gradient(135deg,#0a0a0a,#1a1a1a);display:flex;align-items:center;justify-content:center;padding:20px;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.game-wrapper{display:flex;flex-direction:column;gap:20px;background:#000c;border-radius:16px;padding:20px;box-shadow:0 0 60px #dc143c4d,0 0 40px #00ced133;border:2px solid rgba(220,20,60,.3)}.header{text-align:center}.header h1{font-size:2.5rem;font-weight:900;color:#fff;text-shadow:0 0 20px rgba(220,20,60,.6);margin-bottom:15px;letter-spacing:3px}.score-board{display:flex;justify-content:center;gap:60px}.score{display:flex;flex-direction:column;align-items:center;gap:8px}.score.player-score .label{color:#dc143c;font-weight:700;font-size:1rem}.score.ai-score .label{color:#00ced1;font-weight:700;font-size:1rem}.score-value{font-size:2rem;font-weight:900;color:#fff;background:#0009;padding:8px 20px;border-radius:8px;min-width:60px;text-align:center}.game-canvas{border:3px solid #333;border-radius:12px;background:#0a0a0a;display:block;max-width:100%;height:auto;box-shadow:0 0 20px #00000080}.controls-panel{display:flex;justify-content:center;min-height:120px}.mode-selection{text-align:center;display:flex;flex-direction:column;gap:20px;align-items:center}.mode-selection h2{color:#fff;font-size:1.3rem;margin:0}.difficulty-buttons{display:flex;gap:15px;justify-content:center;flex-wrap:wrap}.btn{padding:12px 24px;font-size:1rem;font-weight:700;border:none;border-radius:8px;cursor:pointer;transition:all .3s ease;text-transform:uppercase;letter-spacing:1px;box-shadow:0 4px 12px #0006}.btn-easy{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff}.btn-easy:hover{transform:translateY(-2px);box-shadow:0 6px 16px #22c55e66}.btn-medium{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff}.btn-medium:hover{transform:translateY(-2px);box-shadow:0 6px 16px #f59e0b66}.btn-hard{background:linear-gradient(135deg,#dc143c,#b91c1c);color:#fff}.btn-hard:hover{transform:translateY(-2px);box-shadow:0 6px 16px #dc143c66}.btn-reset{background:linear-gradient(135deg,#3b82f6,#1d4ed8);color:#fff}.btn-reset:hover{transform:translateY(-2px);box-shadow:0 6px 16px #3b82f666}.btn:active{transform:translateY(0)}.instructions{background:#ffffff0d;padding:15px 25px;border-radius:8px;border-left:4px solid #DC143C;max-width:400px}.instructions h3{color:#fff;font-size:.95rem;margin:0 0 10px;text-transform:uppercase;letter-spacing:1px}.instructions p{color:#ccc;margin:6px 0;font-size:.9rem;line-height:1.5}.instructions strong{color:#00ced1;font-weight:700}.game-controls{display:flex;flex-direction:column;align-items:center;gap:15px}.controls-hint{background:#ffffff0d;padding:12px 20px;border-radius:8px;border:1px solid rgba(0,206,209,.3)}.controls-hint p{color:#00ced1;margin:0;font-size:.95rem;font-weight:500}@media(max-width:1024px){.game-wrapper{padding:15px;gap:15px}.header h1{font-size:2rem}.score-board{gap:40px}.difficulty-buttons{flex-direction:column}.btn{width:100%}}@media(max-width:640px){.app-container{padding:10px}.game-wrapper{padding:10px;gap:10px}.header h1{font-size:1.5rem}.score-board{gap:30px}.score-value{font-size:1.5rem;padding:6px 15px}.instructions{font-size:.85rem}}