*,*:before,*:after{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Outfit,sans-serif;background:linear-gradient(145deg,#1a1a2e,#16213e,#0f3460);color:#e8e8e8;display:flex;align-items:center;justify-content:center;padding:1rem}.wrapper{width:100%;max-width:520px}.level-screen{text-align:center;padding:2rem 1rem}.level-screen h1{font-size:2.5rem;font-weight:700;margin:0 0 .25rem;letter-spacing:.02em;background:linear-gradient(135deg,#e94560,#ff6b6b);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.level-screen p{margin:0 0 2rem;color:#a0a0b0;font-size:1rem}.level-buttons{display:flex;flex-direction:column;gap:.75rem;max-width:220px;margin:0 auto}.level-btn{font-family:inherit;font-size:1.1rem;font-weight:600;padding:.9rem 1.5rem;border:none;border-radius:12px;cursor:pointer;transition:transform .15s,box-shadow .15s;color:#1a1a2e}.level-btn:hover{transform:translateY(-2px);box-shadow:0 8px 20px #00000040}.level-btn[data-level=easy]{background:linear-gradient(135deg,#6bcb77,#4ade80)}.level-btn[data-level=medium]{background:linear-gradient(135deg,#ffd93d,#fbbf24)}.level-btn[data-level=hard]{background:linear-gradient(135deg,#e94560,#ef4444);color:#fff}.game-screen.hidden,.win-overlay.hidden,.level-screen.hidden{display:none!important}.game-screen{padding:.5rem 0 2rem}.header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:1.25rem}.header h1{font-size:1.75rem;font-weight:700;margin:0;background:linear-gradient(135deg,#e94560,#ff6b6b);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.toolbar{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.timer{font-variant-numeric:tabular-nums;font-weight:600;color:#a0a0b0;min-width:3.5rem}.level-badge{font-size:.8rem;font-weight:600;text-transform:capitalize;padding:.25rem .6rem;border-radius:8px;background:#ffffff1a;color:#c0c0d0}.btn{font-family:inherit;font-size:.9rem;font-weight:600;padding:.5rem 1rem;border:none;border-radius:10px;cursor:pointer;background:#e94560;color:#fff;transition:background .2s,transform .1s}.btn:hover{background:#ff6b6b}.btn:active{transform:scale(.98)}.btn-ghost{background:transparent;color:#a0a0b0;border:1px solid rgba(255,255,255,.15)}.btn-ghost:hover{background:#ffffff14;color:#e8e8e8}.btn-large{padding:.75rem 1.5rem;font-size:1rem}.game-container{position:relative}.board-wrapper{background:#ffffff0a;border-radius:16px;padding:12px;margin-bottom:1rem;border:1px solid rgba(255,255,255,.08)}.board{display:grid;aspect-ratio:1;max-width:100%;margin:0 auto;border:2px solid #e94560;border-radius:8px;overflow:hidden;background:#0d0d1a}.board-4{grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr)}.board-6{grid-template-columns:repeat(6,1fr);grid-template-rows:repeat(6,1fr)}.board-9{grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr)}.cell{display:flex;align-items:center;justify-content:center;font-size:clamp(.85rem,4vw,1.25rem);font-weight:600;border:1px solid rgba(255,255,255,.08);cursor:pointer;transition:background .15s;min-height:0}.cell.given{background:#e945601f;color:#ff8a9e;cursor:default}.cell.user{color:#e8e8e8}.cell.selected{background:#e9456059;outline:2px solid #e94560;outline-offset:-2px;z-index:1}.cell.same-number{background:#e9456033}.cell.error{color:#ef4444;background:#ef444426}.cell.cell-edge-r{border-right-width:2px;border-right-color:#fff3}.cell.cell-edge-b{border-bottom-width:2px;border-bottom-color:#fff3}.number-pad{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem}.num-btn{font-family:inherit;font-size:1.1rem;font-weight:600;padding:.65rem;border:none;border-radius:10px;cursor:pointer;background:#ffffff14;color:#e8e8e8;border:1px solid rgba(255,255,255,.1);transition:background .15s,transform .1s}.num-btn:hover{background:#ffffff26}.num-btn:active{transform:scale(.96)}.num-btn-clear{grid-column:span 2;background:#ef444433;color:#f87171;border-color:#ef44444d}.num-btn-clear:hover{background:#ef444459}.win-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bf;display:flex;align-items:center;justify-content:center;z-index:100;padding:1rem}.win-box{background:linear-gradient(145deg,#1a1a2e,#16213e);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:2rem;text-align:center;max-width:320px;width:100%;box-shadow:0 25px 50px #0006}.win-box h2{margin:0 0 .5rem;font-size:1.75rem;color:#e8e8e8}.win-time{margin:0 0 1.5rem;color:#a0a0b0;font-size:1rem}@media(min-width:420px){.board .cell{font-size:1.15rem}}