*{margin:0;padding:0;box-sizing:border-box}:root{font-family:Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100vh;background:linear-gradient(135deg,#1a472a,#2d5a3d,#1a472a)}#root{min-height:100vh}.card{width:120px;height:168px;perspective:1000px;cursor:default}.card-inner{position:relative;width:100%;height:100%;transition:transform .6s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}.card.flipped .card-inner{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:10px;box-shadow:0 4px 8px #0003,0 2px 4px #0000001a}.card-back{background:linear-gradient(135deg,#1e3a5f,#2d5a87,#1e3a5f);border:3px solid #0d2137;display:flex;align-items:center;justify-content:center;overflow:hidden}.card-pattern{width:80%;height:85%;border:2px solid rgba(255,255,255,.3);border-radius:6px;background-image:repeating-linear-gradient(45deg,transparent,transparent 8px,rgba(255,255,255,.05) 8px,rgba(255,255,255,.05) 16px),repeating-linear-gradient(-45deg,transparent,transparent 8px,rgba(255,255,255,.05) 8px,rgba(255,255,255,.05) 16px)}.card-front{background:linear-gradient(145deg,#fff,#f8f9fa);border:1px solid #ddd;transform:rotateY(180deg);display:flex;flex-direction:column;padding:8px;box-sizing:border-box}.card-front.red{color:#c41e3a}.card-front.black{color:#1a1a1a}.card-corner{display:flex;flex-direction:column;align-items:center;line-height:1}.card-corner.top-left{align-self:flex-start}.card-corner.bottom-right{align-self:flex-end;transform:rotate(180deg)}.card-rank{font-size:18px;font-weight:700;font-family:Georgia,serif}.card-suit{font-size:16px;margin-top:-2px}.card-center{flex:1;display:flex;align-items:center;justify-content:center}.card-suit-large{font-size:48px}.game-board{display:flex;flex-direction:column;align-items:center;padding:40px 20px;min-height:100vh;box-sizing:border-box}.game-title{font-size:2.5rem;font-weight:300;color:#fff;margin:0 0 50px;text-shadow:0 2px 4px rgba(0,0,0,.3);letter-spacing:4px;text-transform:uppercase}.cards-container{display:flex;gap:20px;margin-bottom:30px;flex-wrap:wrap;justify-content:center}.question{font-size:1.5rem;color:#fff;margin:0 0 30px;text-shadow:0 2px 4px rgba(0,0,0,.3);font-weight:400;letter-spacing:1px}.controls{display:flex;gap:20px}.btn{padding:14px 40px;font-size:1.1rem;font-weight:600;border:none;border-radius:8px;cursor:pointer;transition:all .2s ease;text-transform:uppercase;letter-spacing:2px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-flip{background:linear-gradient(145deg,#4a90d9,#357abd);color:#fff;box-shadow:0 4px 15px #4a90d966}.btn-flip:hover:not(:disabled){background:linear-gradient(145deg,#5a9fe8,#4589cc);transform:translateY(-2px);box-shadow:0 6px 20px #4a90d980}.btn-flip:active:not(:disabled){transform:translateY(0)}.btn-reset{background:linear-gradient(145deg,#6c757d,#5a6268);color:#fff;box-shadow:0 4px 15px #6c757d66}.btn-reset:hover{background:linear-gradient(145deg,#7c858d,#6a7278);transform:translateY(-2px);box-shadow:0 6px 20px #6c757d80}.btn-reset:active{transform:translateY(0)}@media(max-width:600px){.game-title{font-size:1.8rem;margin-bottom:30px}.cards-container{gap:12px}.controls{flex-direction:column;width:100%;max-width:280px}.btn{width:100%}}