:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:#0a0a0a;color:#fafafa}.shell{min-height:100vh;display:grid;place-items:center;padding:2rem}.puzzle-container{display:flex;flex-direction:column;align-items:center;gap:1.25rem}.title{margin:0;font-size:2rem;font-weight:700;letter-spacing:-.03em;background:linear-gradient(135deg,#3b82f6,#a855f7,#ec4899);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{margin:0;color:#ffffff80;font-size:.9rem}.stats{display:flex;gap:1.5rem;flex-wrap:wrap;justify-content:center}.stat{display:flex;flex-direction:column;align-items:center;min-width:4rem}.stat-value{font-size:1.35rem;font-weight:700;font-variant-numeric:tabular-nums;color:#fafafa}.stat-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.1em;color:#fff6}.board{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;width:min(85vw,380px);aspect-ratio:1;padding:8px;background:#ffffff0a;border:1px solid rgba(255,255,255,.08);border-radius:1rem}.tile{display:flex;align-items:center;justify-content:center;border:none;border-radius:.6rem;font-size:1.5rem;font-weight:700;cursor:pointer;color:#fff;background:var(--tile-color, transparent);box-shadow:0 2px 8px #0000004d,inset 0 1px #ffffff26;transition:transform .1s ease,box-shadow .1s ease;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;aspect-ratio:1}.tile:not(:disabled):hover{transform:scale(1.04);box-shadow:0 4px 16px #0006,inset 0 1px #fff3}.tile:not(:disabled):active{transform:scale(.96)}.tile-blank{background:#ffffff08;cursor:default;box-shadow:inset 0 2px 4px #0003}.tile-won{animation:celebrate .6s ease forwards}@keyframes celebrate{0%{transform:scale(1)}50%{transform:scale(1.08)}to{transform:scale(1)}}.win-message{text-align:center;font-size:1.1rem;font-weight:600;color:#22c55e;padding:.75rem 1.5rem;background:#22c55e1a;border:1px solid rgba(34,197,94,.25);border-radius:.75rem}.new-game-btn{padding:.6rem 2rem;border:1px solid rgba(255,255,255,.15);border-radius:.5rem;background:#ffffff0f;color:#fafafa;font-size:.9rem;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s}.new-game-btn:hover{background:#ffffff1a;border-color:#ffffff40}