:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;display:flex;justify-content:center;min-width:320px;min-height:100vh}#app{width:100%;max-width:1200px;margin:0 auto;padding:2rem}.app-container{display:flex;flex-direction:column;gap:2rem}header{text-align:center}h1{font-size:3rem;line-height:1.1;margin-bottom:1rem;background:linear-gradient(135deg,#e74c3c,#9b59b6,#27ae60);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header-controls{display:flex;gap:1rem;justify-content:center;align-items:center;flex-wrap:wrap}.btn-stats{padding:.5rem 1rem;font-size:1rem;background-color:#3498db;color:#fff;border:none;border-radius:6px;cursor:pointer;transition:all .3s;font-weight:600}.btn-stats:hover{background-color:#2980b9;transform:scale(1.05)}.score{font-size:1.2rem;color:#888}.mode-selector{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.mode-btn{padding:.75rem 1.5rem;font-size:1rem;background-color:#333;color:#fff;border:2px solid #555;border-radius:8px;cursor:pointer;transition:all .3s}.mode-btn:hover{background-color:#444;border-color:#666}.mode-btn.active{background-color:#9b59b6;border-color:#9b59b6}.difficulty-selector{display:flex;gap:1rem;justify-content:center;align-items:center;flex-wrap:wrap}.difficulty-label{font-size:1.1rem;color:#aaa;font-weight:600}.diff-btn{padding:.5rem 1rem;font-size:.9rem;background-color:#2c2c2c;color:#fff;border:2px solid #444;border-radius:6px;cursor:pointer;transition:all .3s}.diff-btn:hover{background-color:#3a3a3a;border-color:#555}.diff-btn.active{background-color:#3498db;border-color:#3498db;font-weight:600}.mode-container{display:flex;flex-direction:column;gap:1.5rem;align-items:center}.mode-container h2{font-size:2rem;color:#fff}.instructions{font-size:1.1rem;color:#aaa;text-align:center}.timer-container{display:flex;justify-content:center;margin:.5rem 0}.timer-display{font-size:2.5rem;font-weight:700;font-family:Courier New,monospace;padding:.5rem 1.5rem;background:#0000004d;border-radius:12px;min-width:120px;text-align:center;transition:color .3s}.base-cards-section,.options-section{display:flex;flex-direction:column;gap:1rem;align-items:center;width:100%;margin:1rem 0}.options-section{margin-top:2.5rem;padding-top:2rem;border-top:2px solid #444}.section-label{font-size:1.1rem;color:#3498db;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.base-cards,.options,.cards-display{display:flex;gap:1.5rem;justify-content:center;align-items:center;flex-wrap:wrap;width:100%}.set-card{width:180px;height:240px;background:#fff;border:3px solid #ddd;border-radius:12px;padding:1rem;display:flex;align-items:center;justify-content:center;transition:all .3s;box-shadow:0 4px 6px #0000001a}.set-card.clickable{cursor:pointer}.set-card.clickable:hover{transform:translateY(-8px);box-shadow:0 8px 12px #0003;border-color:#9b59b6}.set-card.correct-answer{border-color:#27ae60;border-width:4px;box-shadow:0 0 20px #27ae6080}.shapes-container{display:flex;flex-direction:column;gap:.5rem;align-items:center;justify-content:center}.buttons{display:flex;gap:1.5rem;margin-top:1rem;justify-content:center;width:100%}.btn{padding:1rem 2rem;font-size:1.1rem;border:none;border-radius:8px;cursor:pointer;transition:all .3s;font-weight:600}.btn-yes{background-color:#27ae60;color:#fff}.btn-yes:hover:not(:disabled){background-color:#229954;transform:scale(1.05)}.btn-no{background-color:#e74c3c;color:#fff}.btn-no:hover:not(:disabled){background-color:#c0392b;transform:scale(1.05)}.btn:disabled{opacity:.5;cursor:not-allowed}.feedback{font-size:1.5rem;font-weight:700;min-height:2rem;transition:all .3s}.feedback.correct{color:#27ae60}.feedback.wrong{color:#e74c3c}.feedback.timeout{color:#f39c12}.btn-start{padding:1.5rem 3rem;font-size:1.5rem;background:linear-gradient(135deg,#3498db,#2ecc71);color:#fff;border:none;border-radius:12px;cursor:pointer;transition:all .3s;font-weight:700;box-shadow:0 4px 8px #0003}.btn-start:hover{transform:scale(1.1);box-shadow:0 6px 12px #0000004d}.cards-section{display:flex;flex-direction:column;gap:1.5rem;align-items:center;width:100%}.stats-overlay{position:fixed;inset:0;background:#000000d9;display:flex;justify-content:center;align-items:center;z-index:1000;padding:1rem}.stats-modal{background:#2c2c2c;border-radius:16px;max-width:900px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:0 8px 32px #00000080}.stats-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;border-bottom:2px solid #444}.stats-header h2{margin:0;color:#fff}.btn-close{background:none;border:none;color:#aaa;font-size:2rem;cursor:pointer;padding:0;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .3s}.btn-close:hover{background:#444;color:#fff}.stats-content{padding:2rem}.stats-section{margin-bottom:2rem}.stats-section h3{color:#fff;margin-bottom:1rem;font-size:1.3rem}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem}.stat-card{background:#1a1a1a;padding:1.5rem;border-radius:12px;text-align:center;border:2px solid #333}.stat-card.success{border-color:#27ae60}.stat-card.error{border-color:#e74c3c}.stat-card.warning{border-color:#f39c12}.stat-value{font-size:2rem;font-weight:700;color:#fff;margin-bottom:.5rem}.stat-label{font-size:.9rem;color:#aaa}.stats-table{overflow-x:auto}.stats-table table{width:100%;border-collapse:collapse;background:#1a1a1a;border-radius:8px;overflow:hidden}.stats-table th,.stats-table td{padding:1rem;text-align:left}.stats-table th{background:#333;color:#fff;font-weight:600}.stats-table tr:not(:last-child){border-bottom:1px solid #333}.stats-table td{color:#ddd}.stats-table td.success{color:#27ae60;font-weight:600}.stats-table td.error{color:#e74c3c;font-weight:600}.stats-table td.warning{color:#f39c12;font-weight:600}.stats-actions{margin-top:2rem;text-align:center}.btn-danger{background-color:#e74c3c;color:#fff;padding:.75rem 1.5rem;border:none;border-radius:8px;cursor:pointer;font-size:1rem;transition:all .3s}.btn-danger:hover{background-color:#c0392b;transform:scale(1.05)}footer{text-align:center;color:#666;font-size:.9rem;padding:1rem;border-top:1px solid #444}@media(max-width:768px){h1{font-size:2rem}.set-card{width:140px;height:200px}.mode-container h2{font-size:1.5rem}.buttons{flex-direction:column;width:100%}.btn{width:100%}}