.home{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.home-content{text-align:center;max-width:800px}.home-title{font-size:3rem;color:#fff;margin-bottom:16px;text-shadow:2px 2px 4px rgba(0,0,0,.2)}.home-subtitle{font-size:1.25rem;color:#ffffffe6;margin-bottom:40px}.home-actions{display:flex;gap:16px;justify-content:center;margin-bottom:60px}.home-btn{padding:16px 40px;font-size:18px;text-decoration:none}.home-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px}.feature{background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:12px;padding:24px;color:#fff}.feature-icon{font-size:2.5rem;display:block;margin-bottom:12px}.feature h3{color:#fff;margin-bottom:8px}.feature p{color:#fffc;font-size:14px}.admin-page{min-height:100vh;padding:20px}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.admin-header h1{color:#fff}.quizzes-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}.quiz-card h3{margin-bottom:8px}.quiz-description{color:#666;font-size:14px;margin-bottom:8px}.quiz-meta{color:#888;font-size:12px;margin-bottom:16px}.quiz-actions{display:flex;gap:8px;flex-wrap:wrap}.quiz-actions .btn{padding:8px 16px;font-size:14px}.quiz-form h2{margin-bottom:16px}.option-input{display:flex;align-items:center;gap:12px;margin-bottom:8px}.option-input input[type=radio]{width:20px;height:20px}.questions-list{display:flex;flex-direction:column;gap:12px}.question-item{background:#f8f9fa;padding:12px;border-radius:8px}.question-header{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:8px}.question-options{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}.option-tag{background:#e0e0e0;padding:4px 8px;border-radius:4px;font-size:12px}.option-tag.correct{background:#10b981;color:#fff}.btn-sm{padding:4px 12px;font-size:12px}.form-actions{display:flex;gap:12px}.session-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.session-header h1,.connection-status{color:#fff}.status-connected{color:#10b981}.status-disconnected{color:#ef4444}.session-grid{display:grid;grid-template-columns:1fr 300px;gap:20px}@media (max-width: 768px){.session-grid{grid-template-columns:1fr}}.qr-card{text-align:center}.qr-card h2{font-size:2rem;letter-spacing:4px;margin-bottom:20px}.qr-container{display:flex;justify-content:center;margin-bottom:16px}.join-url{color:#666;font-size:14px;margin-bottom:20px;word-break:break-all}.timer-display{margin-bottom:20px}.timer{font-size:4rem;font-weight:700;color:#667eea}.timer-warning{color:#ef4444;animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.question-text{font-size:1.25rem;margin-bottom:20px}.options-preview{text-align:left;margin-bottom:20px}.option-preview{padding:8px 12px;background:#f0f0f0;border-radius:4px;margin-bottom:8px}.submission-status{color:#666;margin-bottom:20px}.question-controls{display:flex;gap:12px;justify-content:center}.participants-card h2{margin-bottom:16px}.participants-list{max-height:400px;overflow-y:auto}.no-participants{color:#888;text-align:center;padding:20px}.participant-item{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid #eee}.participant-item:last-child{border-bottom:none}.participant-status.online{color:#10b981}.participant-status.offline{color:#888}.student-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.join-container{width:100%;max-width:400px}.join-card{text-align:center}.join-card h1{margin-bottom:8px}.join-subtitle{color:#666;margin-bottom:24px}.code-input{text-align:center;font-size:1.5rem;letter-spacing:4px;text-transform:uppercase}.btn-block{width:100%;margin-top:16px}.error-message{color:#ef4444;font-size:14px;margin-bottom:8px;text-align:center}.quiz-container{width:100%;max-width:600px}.waiting-card{padding:40px}.waiting-icon{font-size:4rem;margin-bottom:16px}.waiting-message{color:#666;margin-top:16px}.connection-indicator{margin-top:24px;font-size:14px}.connected{color:#10b981}.disconnected{color:#f59e0b}.timer-bar{background:#fff;border-radius:12px;padding:16px 24px;display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;box-shadow:0 4px 20px #0000001a}.timer-bar.warning{background:#fef2f2;animation:pulse 1s infinite}.timer-value{font-size:2rem;font-weight:700;color:#667eea}.timer-bar.warning .timer-value{color:#ef4444}.timer-label{color:#666;font-size:14px}.question-card{text-align:center}.question-text{font-size:1.25rem;margin-bottom:24px;line-height:1.5}.options-grid{display:grid;gap:12px;margin-bottom:20px}.option-btn{display:flex;align-items:center;gap:12px;padding:16px 20px;background:#f8f9fa;border:2px solid transparent;border-radius:12px;cursor:pointer;transition:all .2s ease;text-align:left;font-size:16px}.option-btn:hover:not(.disabled){background:#f0f0f0;transform:translateY(-2px)}.option-btn.selected{background:#667eea;color:#fff;border-color:#667eea}.option-btn.disabled{cursor:not-allowed;opacity:.7}.option-letter{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:#fff;border-radius:50%;font-weight:700;color:#667eea;flex-shrink:0}.option-btn.selected .option-letter{background:#fff;color:#667eea}.option-text{flex:1}.submit-btn{margin-top:16px;padding:16px;font-size:18px}.submitted-message{margin-top:20px;padding:16px;background:#ecfdf5;color:#059669;border-radius:8px;font-weight:600}.timeout-message{margin-top:20px;padding:16px;background:#fef2f2;color:#dc2626;border-radius:8px;font-weight:600}.results-card{padding:40px}.my-result{margin:24px 0}.rank-badge{display:inline-block;font-size:2.5rem;font-weight:700;color:#667eea;margin-bottom:8px}.result-score{font-size:1.5rem;font-weight:700;margin-bottom:8px}.result-time{color:#666}@keyframes pulse{0%,to{opacity:1}50%{opacity:.8}}.results-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.results-container{width:100%;max-width:600px;text-align:center}.results-title{font-size:2.5rem;color:#fff;margin-bottom:8px}.quiz-title{color:#ffffffe6;margin-bottom:24px;font-weight:400}.leaderboard{text-align:left}.leaderboard h3{text-align:center;margin-bottom:16px;font-size:1.25rem}.leaderboard-list{display:flex;flex-direction:column;gap:8px}.leaderboard-item{display:flex;align-items:center;padding:12px 16px;background:#f8f9fa;border-radius:8px;gap:16px}.leaderboard-item.top-1{background:linear-gradient(135deg,gold,#ffec8b)}.leaderboard-item.top-2{background:linear-gradient(135deg,silver,#e8e8e8)}.leaderboard-item.top-3{background:linear-gradient(135deg,#cd7f32,#daa06d)}.rank{font-size:1.5rem;min-width:40px;text-align:center}.player-info{flex:1;display:flex;flex-direction:column}.player-name{font-weight:600;font-size:1rem}.player-score{font-size:.875rem;color:#666}.player-time{font-size:.875rem;color:#888}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:#333}.app{min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:20px}.card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 20px #0000001a}.btn{padding:12px 24px;border:none;border-radius:8px;cursor:pointer;font-size:16px;font-weight:600;transition:all .2s ease}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.btn-secondary{background:#f0f0f0;color:#333}.btn-secondary:hover{background:#e0e0e0}.btn-success{background:#10b981;color:#fff}.btn-success:hover{background:#059669}.btn-danger{background:#ef4444;color:#fff}.btn-danger:hover{background:#dc2626}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.input{width:100%;padding:12px 16px;border:2px solid #e0e0e0;border-radius:8px;font-size:16px;transition:border-color .2s ease}.input:focus{outline:none;border-color:#667eea}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:#555}h1,h2,h3{color:#333}.text-center{text-align:center}.mt-4{margin-top:16px}.mb-4{margin-bottom:16px}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-4{gap:16px}