*{margin:0;padding:0;box-sizing:border-box}
.game-container{display:flex;flex-direction:column;align-items:center;width:100%;max-width:500px;margin:0 auto;font-family:'Segoe UI',system-ui,sans-serif;background:#0f0d1a;min-height:100vh;color:#e2e8f0}
.game-header{display:flex;justify-content:space-between;align-items:center;width:100%;padding:12px 16px;background:linear-gradient(135deg,#1a1740,#0f0d2e);border-bottom:1px solid rgba(99,102,241,.2)}
.game-title{font-size:18px;font-weight:700;color:#a5b4fc}
.header-right{display:flex;gap:10px}
.stat-box{text-align:center}
.stat-label{display:block;font-size:9px;color:#94a3b8;text-transform:uppercase;letter-spacing:1px}
.stat-value{font-size:16px;font-weight:700;color:#e2e8f0}
.stat-box.best .stat-value{color:#fbbf24}

.cards-grid{flex:1;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:12px;width:100%;max-width:380px;align-content:center;justify-content:center}

.card{position:relative;aspect-ratio:1;perspective:600px;cursor:pointer;-webkit-tap-highlight-color:transparent}
.card-inner{position:relative;width:100%;height:100%;transition:transform .4s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}
.card.flipped .card-inner{transform:rotateY(180deg)}
.card.matched .card-front{opacity:.6;border-color:#4ade80;background:rgba(74,222,128,.15)}
.card.matched{animation:matchPop .4s ease}
@keyframes matchPop{0%{transform:scale(1)}40%{transform:scale(1.12)}100%{transform:scale(1)}}

/* Error shake animation */
.card.shake .card-inner{animation:shake .5s ease}
@keyframes shake{0%,100%{transform:rotateY(180deg) translateX(0)}20%{transform:rotateY(180deg) translateX(-6px)}40%{transform:rotateY(180deg) translateX(6px)}60%{transform:rotateY(180deg) translateX(-4px)}80%{transform:rotateY(180deg) translateX(4px)}}

.card-face{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;border-radius:10px;backface-visibility:hidden;font-size:32px}
.card-back{background:linear-gradient(135deg,#6366f1,#4f46e5);border:2px solid rgba(99,102,241,.5);transition:box-shadow .3s}
.card:not(.flipped):not(.matched):hover .card-back{box-shadow:0 0 12px rgba(99,102,241,.4)}
.card-back::after{content:'?';font-size:28px;font-weight:700;color:rgba(255,255,255,.3)}
.card-front{transform:rotateY(180deg);background:#1e1b4b;border:2px solid rgba(99,102,241,.3);transition:border-color .3s,background .3s}

.confetti-canvas{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:5}

.game-over-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.75);z-index:10;justify-content:center;align-items:center}
.game-over-overlay.active{display:flex}
.game-over-panel{background:linear-gradient(135deg,#1e1b4b,#0a0737);border:1px solid rgba(99,102,241,.3);border-radius:16px;padding:32px 28px;text-align:center;max-width:320px;width:90%;animation:panelIn .4s ease}
@keyframes panelIn{0%{transform:translateY(30px) scale(.95);opacity:0}100%{transform:translateY(0) scale(1);opacity:1}}
.game-over-panel h2{font-size:28px;color:#4ade80;margin-bottom:12px}
.final-score{font-size:18px;font-weight:700;margin-bottom:6px;color:#a5b4fc}
.best-score{font-size:14px;color:#94a3b8;margin-bottom:20px}
.restart-btn{padding:12px 36px;font-size:16px;font-weight:700;color:#fff;background:#6366f1;border:none;border-radius:10px;cursor:pointer;transition:transform .15s,background .2s}
.restart-btn:hover{background:#4f46e5;transform:scale(1.05)}
.restart-btn:active{transform:scale(.95)}

@media (orientation:landscape){.cards-grid{grid-template-columns:repeat(4,1fr);max-width:300px;gap:6px}.card-face{font-size:24px}}
@media (max-width:380px){.cards-grid{grid-template-columns:repeat(4,1fr);gap:6px}.card-face{font-size:24px}}