.card{perspective:1000px;cursor:pointer;aspect-ratio:1;position:relative}.card-inner{position:relative;width:100%;height:100%;text-align:center;transition:transform .6s var(--ease-elastic);transform-style:preserve-3d}.card.flipped .card-inner,.card.matched .card-inner{transform:rotateY(180deg)}.card-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:12px;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.card-front{background:var(--bg-card);border:1px solid var(--glass-border);color:var(--primary);transform:rotateY(180deg);font-size:2rem}.card-back{background:linear-gradient(135deg,var(--glass-bg),rgba(255,255,255,.05));border:1px solid var(--glass-border);display:flex;align-items:center;justify-content:center}.card-back:after{content:"?";font-size:1.5rem;font-weight:700;opacity:.3;color:var(--text-muted)}.card.matched .card-front{box-shadow:0 0 15px var(--secondary);border-color:var(--secondary);animation:pulse 1s infinite}@keyframes pulse{0%{transform:rotateY(180deg) scale(1)}50%{transform:rotateY(180deg) scale(1.05)}to{transform:rotateY(180deg) scale(1)}}.app-container{max-width:1400px;margin:0 auto;padding:2rem;min-height:100vh;display:flex;flex-direction:column;align-items:center;gap:2rem}.main-layout{display:flex;gap:2rem;width:100%;align-items:flex-start}.game-board-container{flex:1;display:flex;justify-content:center}.header{width:100%;display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;border-radius:1rem;margin-bottom:2rem;min-height:100px}.title{font-size:2.5rem;font-weight:800;letter-spacing:-.05em}.player-stats{display:flex;align-items:center;gap:2rem;padding:1rem 3rem;border-radius:2rem;margin-bottom:2rem}.player-badge{display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:.5rem 1.5rem;border-radius:1rem;opacity:.5;transition:all .3s var(--ease-elastic);border:2px solid transparent}.player-badge.active{opacity:1;background:var(--glass-highlight);border-color:var(--player-color);box-shadow:0 0 20px -5px var(--player-color);transform:scale(1.1);border-width:3px;animation:pulseProfile 2s infinite}@keyframes pulseProfile{0%{box-shadow:0 0 10px -5px var(--player-color)}50%{box-shadow:0 0 25px 5px var(--player-color)}to{box-shadow:0 0 10px -5px var(--player-color)}}.player-label{font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;font-weight:700;color:var(--text-muted)}.player-badge.active .player-label{color:var(--player-color)}.player-score{font-size:2rem;font-weight:800}.vs-divider{font-weight:900;font-style:italic;color:var(--text-muted);opacity:.3}@media(max-width:768px){.app-container{padding:.75rem;padding-bottom:80px}.header{flex-direction:column;gap:.75rem;text-align:center;padding:1rem}.header>div:last-child{flex-wrap:wrap;justify-content:center}.header button{min-width:44px!important;min-height:44px!important;padding:.75rem!important}.header button[style*="borderRadius: '50%'"]{padding:.75rem!important}.title{font-size:2rem!important}.stats{font-size:1rem!important;flex-wrap:wrap;justify-content:center}.player-stats{gap:1rem;padding:1rem;flex-wrap:wrap}}.leaderboard-sidebar{width:100%;max-width:400px;margin:0 auto}.game-board-container{width:100%;max-width:100%}.collapsible-footer{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);border-top:2px solid var(--glass-border);box-shadow:0 -4px 20px #0000004d;z-index:100}.footer-toggle{width:100%;display:flex;align-items:center;justify-content:center;gap:1rem;padding:1rem 2rem;background:transparent;border:none;color:var(--text-main);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease}.footer-toggle:hover{background:var(--glass-bg);color:var(--primary)}.footer-toggle-text{display:flex;align-items:center;gap:.5rem}.footer-content{padding:2rem;max-height:70vh;overflow-y:auto;animation:slideUp .3s ease-out;border-top:1px solid var(--glass-border)}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;margin-bottom:2rem}.footer-section h4{color:var(--primary);margin-bottom:.75rem;font-size:1.1rem;font-weight:700}.footer-section ul,.footer-section ol{margin-left:1.2rem;line-height:1.8;color:var(--text-main)}.footer-section li{margin-bottom:.5rem}.footer-quote{text-align:center;padding:1.5rem;background:var(--glass-bg);border-radius:.75rem;border:1px solid var(--glass-border);font-style:italic;color:var(--text-muted);font-size:1.1rem}.footer-quote strong{color:var(--primary);font-style:normal}[data-theme=light] select,[data-theme=light] select option{color:#000!important;background:#fff;border-color:#ccc}@media(max-width:768px){.footer-grid{grid-template-columns:1fr;gap:1.5rem}.footer-content{padding:1.5rem;max-height:60vh}.footer-toggle{padding:.75rem 1rem;font-size:.9rem}}.sidebar-wrapper{display:flex;flex-direction:column;gap:1.5rem;position:sticky;top:2rem;height:fit-content;align-self:start}@media(max-width:1100px){.main-layout{flex-direction:column;align-items:center}.sidebar-wrapper{position:static;width:100%;align-self:auto;align-items:center}}.sidebar-player-badge{padding:.5rem;border-radius:.5rem;border:1px solid transparent;transition:all .2s ease}.sidebar-player-badge:hover{background:var(--glass-highlight);border-color:var(--glass-border);transform:translateY(-2px)}.help-fab{position:fixed;bottom:20px;right:20px;width:50px;height:50px;border-radius:50%;background:#94a3b8;color:#0f1729;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;cursor:pointer;box-shadow:0 4px 6px #0000004d;z-index:10002;transition:all .3s cubic-bezier(.175,.885,.32,1.275)}.help-fab:hover{transform:scale(1.1);box-shadow:0 0 20px #fffc,0 0 40px #fff6}.help-fab.active{background:#8b5cf6;color:#fff}.help-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#0009;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:1000;opacity:0;visibility:hidden;transition:opacity .3s}.help-overlay.active{opacity:1;pointer-events:auto}body.modal-open{overflow:hidden;padding-right:var(--scrollbar-width, 0)}.help-modal{position:fixed;top:140px;left:50%;transform:translate(-50%);width:700px;max-width:90vw;max-height:85vh;overflow-y:auto;scrollbar-width:none;-ms-overflow-style:none;background:#0f1729e6;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:2px solid rgba(0,212,255,.4);border-radius:1rem;box-shadow:0 25px 50px #00000080;z-index:10001;padding:2.5rem;display:none;opacity:0}.help-modal h3{color:#00d4ff;margin-bottom:15px;font-size:1.8em;font-weight:700}.help-modal h4{color:#00d4ff;margin-top:20px;margin-bottom:10px;font-size:1.1em;font-weight:600}.help-modal p{margin-bottom:20px;line-height:1.7;color:#b8c5d9;font-size:1.05em}.help-modal strong{color:#fff}.help-modal::-webkit-scrollbar{display:none}.help-modal .btn-primary{margin-bottom:3rem}.help-modal .step{margin-bottom:12px;display:flex;gap:12px;align-items:flex-start}.help-modal .step-num{background:linear-gradient(135deg,#00d4ff,#0fc);color:#0d1020;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:.85em;font-weight:700}.help-modal .quote-container{position:relative;width:100%;padding:2rem 2.5rem;background:#1e293b4d;border:1px solid rgba(255,255,255,.1);border-radius:1rem;overflow:hidden;box-shadow:0 10px 30px -10px #00000080;margin:30px 0}.help-modal .quote-container:before,.help-modal .quote-container:after{position:absolute;font-size:8rem;color:#06b6d41f;font-family:serif;filter:blur(2px);z-index:0;-webkit-user-select:none;user-select:none;pointer-events:none;line-height:1}.help-modal .quote-container:before{content:"“";top:-10px;left:10px}.help-modal .quote-container:after{content:"”";bottom:-40px;right:10px}.help-modal .quote-content{position:relative;z-index:10}.help-modal .quote-text{color:#e2e8f0;font-style:italic;font-size:1.15rem;line-height:1.75;text-align:center;margin-bottom:1rem}.help-modal .quote-author{color:#22d3ee;font-weight:600;text-align:right;display:block}.help-modal.open{display:block;animation:modal-slide-in .7s cubic-bezier(.175,.885,.32,1.275) forwards}.help-modal.closing{display:block;animation:modal-slide-out .7s cubic-bezier(.25,1,.5,1) forwards}@keyframes modal-slide-in{0%{transform:translate(calc(50vw - 60px),calc(100vh - 80px)) scale(.1);opacity:0}to{transform:translate(-50%) scale(1);opacity:1}}@keyframes modal-slide-out{0%{transform:translate(-50%) scale(1);opacity:1}to{transform:translate(calc(50vw - 60px),calc(100vh - 80px)) scale(.1);opacity:0}}@media(max-width:768px){.help-fab{bottom:20px;right:20px;width:50px;height:50px;font-size:24px}}.online-banner{display:flex;align-items:center;justify-content:center;gap:.6rem;padding:.75rem 1.25rem;border-radius:.75rem;font-weight:700;margin-bottom:1.25rem;width:100%;max-width:600px;box-shadow:var(--shadow-sm);transition:all .3s ease}.online-banner.my-turn{background:#06b6d426;border:1px solid var(--primary);color:var(--primary)}.online-banner.opponent-turn{background:#d946ef1f;border:1px solid var(--secondary);color:var(--secondary)}.online-badge{display:inline-flex;align-items:center;gap:.4rem;padding:.3rem .75rem;border-radius:1rem;font-size:.75rem;font-weight:700;background:var(--glass-bg);border:1px solid var(--glass-border);color:var(--text-main)}:root{--bg-dark: #0f172a;--bg-card: #1e293b;--primary: #06b6d4;--secondary: #d946ef;--accent: #8b5cf6;--text-main: #f8fafc;--text-muted: #94a3b8;--glass-bg: rgba(30, 41, 59, .7);--glass-border: rgba(255, 255, 255, .1);--glass-highlight: rgba(255, 255, 255, .05);--font-main: "Inter", system-ui, -apple-system, sans-serif;--ease-elastic: cubic-bezier(.68, -.55, .265, 1.55)}:root[data-theme=light]{--bg-dark: #f0f9ff;--bg-card: #ffffff;--primary: #0891b2;--secondary: #c026d3;--accent: #7c3aed;--text-main: #0f172a;--text-muted: #64748b;--glass-bg: rgba(255, 255, 255, .6);--glass-border: rgba(0, 0, 0, .1);--glass-highlight: rgba(255, 255, 255, .5)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background-color:var(--bg-dark);background-image:radial-gradient(circle at 10% 20%,rgba(6,182,212,.1) 0%,transparent 20%),radial-gradient(circle at 90% 80%,rgba(217,70,239,.1) 0%,transparent 20%);color:var(--text-main);min-height:100vh;-webkit-font-smoothing:antialiased;transition:background-color .3s ease,color .3s ease}button{cursor:pointer;font-family:inherit;border:none;outline:none}.glass-panel{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);box-shadow:0 8px 32px #0000004d}.text-gradient{color:var(--primary);font-weight:800;text-shadow:0 0 10px rgba(6,182,212,.3)}