:root{font-family:Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.5;color-scheme:light}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh}body{background:linear-gradient(135deg,#a8edea,#fed6e3,#d4fc79);background-attachment:fixed}.shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1.5rem}.menu{text-align:center;max-width:560px;width:100%}.title{font-size:clamp(2rem,6vw,3rem);font-weight:800;background:linear-gradient(135deg,#ff6b6b,#ffd93d,#6bcb77,#4d96ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.25rem}.subtitle{font-size:1.15rem;color:#555;margin-bottom:2rem}.difficulty-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:1rem}.diff-btn{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:1.25rem 1rem;border:3px solid transparent;border-radius:1.25rem;cursor:pointer;font-family:inherit;transition:all .2s;box-shadow:0 4px 15px #0000001a}.diff-btn:hover{transform:translateY(-4px);box-shadow:0 8px 25px #00000026}.diff-easy{background:linear-gradient(135deg,#d4fc79,#96e6a1);border-color:#7ec883}.diff-medium{background:linear-gradient(135deg,#ffd93d,#ffb347);border-color:#f0a830}.diff-hard{background:linear-gradient(135deg,#ff6b6b,#ee5a24);border-color:#e04a1a;color:#fff}.diff-expert{background:linear-gradient(135deg,#a66cff,#6bcb77);border-color:#9060e0;color:#fff}.diff-icon{font-size:2rem}.diff-label{font-size:1.1rem;font-weight:700}.diff-info{font-size:.8rem;opacity:.75}.diff-best{font-size:.7rem;opacity:.7;margin-top:.15rem}.game-area{width:100%;max-width:640px;display:flex;flex-direction:column;align-items:center}.header{width:100%;display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:1rem;flex-wrap:wrap}.back-btn{background:#ffffffb3;border:2px solid rgba(0,0,0,.08);border-radius:.75rem;padding:.4rem .9rem;font-size:.9rem;font-weight:600;cursor:pointer;font-family:inherit;transition:background .2s}.back-btn:hover{background:#fffffff2}.game-title{font-size:1.4rem;font-weight:800;color:#333;flex:1;text-align:center}.stats{display:flex;gap:.75rem}.stat{background:#ffffffbf;border:2px solid rgba(0,0,0,.06);border-radius:.75rem;padding:.3rem .75rem;text-align:center;min-width:70px}.stat-label{display:block;font-size:.65rem;text-transform:uppercase;letter-spacing:.05em;color:#888;font-weight:600}.stat-value{display:block;font-size:1.1rem;font-weight:800;color:#333;line-height:1.2}.board{display:grid;gap:10px;padding:16px;background:#ffffff59;border-radius:1.25rem;border:3px solid rgba(255,255,255,.5);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);width:fit-content}.card-slot{width:74px;height:90px;perspective:600px;cursor:pointer;background:none;border:none;padding:0;font-family:inherit;-webkit-tap-highlight-color:transparent}.card-slot:disabled{cursor:default}.card-inner{width:100%;height:100%;position:relative;transition:transform .4s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}.card-slot.flipped .card-inner,.card-slot.matched .card-inner{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:.75rem;display:flex;align-items:center;justify-content:center;font-size:2rem;backface-visibility:hidden;-webkit-backface-visibility:hidden}.card-front{background:linear-gradient(135deg,#667eea,#764ba2);border:3px solid #5a6fd6;box-shadow:0 3px 10px #667eea66;color:#fff;font-size:1.6rem}.card-back{background:linear-gradient(135deg,#fff,#f0f4ff);border:3px solid #d0d8f0;transform:rotateY(180deg);box-shadow:0 3px 10px #0000001a}.card-slot.matched .card-back{background:linear-gradient(135deg,#d4fc79,#96e6a1);border-color:#7ec883;box-shadow:0 0 16px #6bcb7780;animation:pop .4s ease}@keyframes pop{0%{transform:rotateY(180deg) scale(1)}50%{transform:rotateY(180deg) scale(1.15)}to{transform:rotateY(180deg) scale(1)}}.stars{font-size:2rem;margin:.5rem 0}.star{color:#ddd;transition:color .3s}.star.filled{color:#ffd93d;text-shadow:0 0 8px rgba(255,217,61,.5)}.win-overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#00000059;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:100;animation:fadeIn .4s ease}.win-card{background:#fff;border-radius:1.5rem;padding:2.5rem 2rem 2rem;text-align:center;box-shadow:0 20px 60px #00000040;animation:slideUp .5s cubic-bezier(.34,1.56,.64,1);max-width:340px;width:90%}.win-emoji{font-size:3.5rem;margin-bottom:.25rem}.win-card h2{font-size:2rem;font-weight:800;background:linear-gradient(135deg,#ff6b6b,#ffd93d,#6bcb77);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.25rem}.win-card p{color:#666;font-size:1rem;margin-bottom:.25rem}.win-buttons{display:flex;gap:.75rem;margin-top:1rem;justify-content:center}.btn{border:none;border-radius:.75rem;padding:.65rem 1.4rem;font-size:1rem;font-weight:700;cursor:pointer;font-family:inherit;transition:all .2s}.btn-primary{background:linear-gradient(135deg,#6bcb77,#4d96ff);color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 14px #4d96ff66}.btn-secondary{background:#f0f0f0;color:#555}.btn-secondary:hover{background:#e4e4e4}.confetti-container{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden;z-index:200}.confetti{position:absolute;top:-10px;animation:confettiFall linear forwards}@keyframes confettiFall{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(40px) scale(.9);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}@media(max-width:480px){.card-slot{width:60px;height:74px}.card-front,.card-back{font-size:1.5rem}.card-front{font-size:1.3rem}.board{gap:7px;padding:12px}.header{justify-content:center}.game-title{font-size:1.1rem}}