: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}.game{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:2rem 1rem}.header{text-align:center;margin-bottom:2rem}.header h1{margin:0 0 .5rem;font-size:1.75rem;font-weight:700;letter-spacing:-.02em}.stats{display:flex;gap:2rem;justify-content:center;margin-bottom:1.5rem;font-size:.9rem;color:#fff9}.stats span strong{color:#fafafa}.board{display:grid;grid-template-columns:repeat(4,1fr);gap:.75rem;max-width:420px;width:100%}.card-btn{aspect-ratio:1;border:2px solid rgba(255,255,255,.12);border-radius:.75rem;background:#ffffff0a;cursor:pointer;font-size:2.5rem;display:flex;align-items:center;justify-content:center;transition:all .25s ease;position:relative;perspective:600px}.card-btn:hover:not(.flipped):not(.matched){background:#ffffff14;border-color:#ffffff40;transform:translateY(-2px)}.card-btn.flipped{background:#ffffff1a;border-color:#ffffff4d}.card-btn.matched{background:#4ade801a;border-color:#4ade8066;cursor:default}.card-back{font-size:1.5rem;color:#ffffff4d}.win-message{text-align:center;margin-top:2rem;animation:fadeIn .5s ease}.win-message h2{font-size:1.5rem;margin:0 0 .75rem;color:#4ade80}.win-message p{color:#ffffffa6;margin:0 0 1.25rem}.btn{padding:.6rem 1.5rem;border-radius:.5rem;border:1px solid rgba(255,255,255,.2);background:#ffffff14;color:#fafafa;font-size:.9rem;cursor:pointer;transition:background .2s}.btn:hover{background:#ffffff26}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}