*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#1a1a2e,#16213e 50%,#0f3460);color:#fff}.container,body{min-height:100vh}.container{max-width:800px;margin:0 auto;padding:20px;display:flex;flex-direction:column;align-items:center;justify-content:center}.card{background:hsla(0,0%,100%,.05);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid hsla(0,0%,100%,.1);border-radius:20px;padding:40px;width:100%;box-shadow:0 8px 32px rgba(0,0,0,.3)}.title{font-size:2.5rem;font-weight:700;text-align:center;margin-bottom:10px;background:linear-gradient(90deg,#e94560,#0f3460);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{text-align:center;color:hsla(0,0%,100%,.6);margin-bottom:40px;font-size:1.1rem}.categories-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));grid-gap:16px;gap:16px;margin-bottom:30px}.category-card{background:hsla(0,0%,100%,.08);border:2px solid hsla(0,0%,100%,.1);border-radius:16px;padding:24px 16px;cursor:pointer;transition:all .3s ease;text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px}.category-card:hover{background:rgba(233,69,96,.2);border-color:#e94560;transform:translateY(-4px);box-shadow:0 8px 24px rgba(233,69,96,.3)}.category-card.selected{background:rgba(233,69,96,.3);border-color:#e94560;box-shadow:0 4px 16px rgba(233,69,96,.4)}.category-icon{font-size:2.5rem}.category-name{font-size:1rem;font-weight:600;color:#fff}.category-count{font-size:.8rem;color:hsla(0,0%,100%,.5)}.btn{padding:14px 32px;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;display:inline-flex;align-items:center;gap:8px}.btn-primary{background:linear-gradient(135deg,#e94560,#c23152);color:#fff;box-shadow:0 4px 16px rgba(233,69,96,.4)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(233,69,96,.5)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-secondary{background:hsla(0,0%,100%,.1);color:#fff;border:1px solid hsla(0,0%,100%,.2)}.btn-secondary:hover{background:hsla(0,0%,100%,.2);transform:translateY(-2px)}.btn-center{display:flex;justify-content:center;margin-top:20px}.quiz-header{justify-content:space-between;margin-bottom:30px;gap:12px}.quiz-header,.quiz-info{display:flex;align-items:center;flex-wrap:wrap}.quiz-info{gap:16px}.badge{background:hsla(0,0%,100%,.1);border:1px solid hsla(0,0%,100%,.2);border-radius:8px;font-size:.85rem;font-weight:500}.badge,.timer{padding:6px 14px}.timer{background:rgba(233,69,96,.2);border:1px solid #e94560;border-radius:8px;font-size:.95rem;font-weight:700;color:#e94560;min-width:70px;text-align:center}.timer.warning{background:rgba(255,100,0,.2);border-color:#ff6400;color:#ff6400;animation:pulse 1s infinite}.timer.danger{background:rgba(255,0,0,.2);border-color:red;color:red;animation:pulse .5s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}.progress-bar-container{background:hsla(0,0%,100%,.1);border-radius:8px;height:8px;margin-bottom:30px;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,#e94560,#c23152);border-radius:8px;transition:width .4s ease}.question-number{font-size:.9rem;color:hsla(0,0%,100%,.5);margin-bottom:12px}.question-text{font-size:1.3rem;font-weight:600;line-height:1.6;margin-bottom:30px;color:#fff}.options-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:14px;gap:14px;margin-bottom:20px}@media (max-width:600px){.options-grid{grid-template-columns:1fr}.title{font-size:1.8rem}.card{padding:24px}}.option-btn{background:hsla(0,0%,100%,.07);border:2px solid hsla(0,0%,100%,.1);border-radius:12px;padding:16px;cursor:pointer;transition:all .3s ease;text-align:left;color:#fff;font-size:.95rem;font-weight:500;line-height:1.4;display:flex;align-items:center;gap:10px}.option-btn:hover:not(:disabled){background:hsla(0,0%,100%,.15);border-color:hsla(0,0%,100%,.3);transform:translateY(-2px)}.option-btn:disabled{cursor:default}.option-btn.correct{background:rgba(46,213,115,.25);border-color:#2ed573;color:#2ed573}.option-btn.incorrect,.option-btn.selected-wrong{background:rgba(255,71,87,.25);border-color:#ff4757;color:#ff4757}.option-label{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:hsla(0,0%,100%,.1);font-size:.8rem;font-weight:700;flex-shrink:0}.feedback{text-align:center;padding:12px;border-radius:10px;margin-bottom:16px;font-weight:600;font-size:1rem}.feedback.correct{background:rgba(46,213,115,.2);color:#2ed573;border:1px solid #2ed573}.feedback.incorrect{background:rgba(255,71,87,.2);color:#ff4757;border:1px solid #ff4757}.score-display{text-align:center;margin-bottom:30px}.score-circle{width:160px;height:160px;border-radius:50%;background:linear-gradient(135deg,rgba(233,69,96,.3),rgba(15,52,96,.5));border:4px solid #e94560;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 20px;box-shadow:0 0 40px rgba(233,69,96,.3)}.score-number{font-size:2.8rem;font-weight:800;color:#e94560;line-height:1}.score-total{font-size:1rem;color:hsla(0,0%,100%,.6);margin-top:4px}.score-percentage{font-size:1.5rem;font-weight:700;color:#fff;margin-bottom:8px}.score-message{font-size:1.1rem;color:hsla(0,0%,100%,.7);margin-bottom:24px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:16px;gap:16px;margin-bottom:30px}.stat-item{background:hsla(0,0%,100%,.07);border-radius:12px;padding:16px;text-align:center}.stat-value{font-size:1.5rem;font-weight:700;color:#e94560}.stat-label{font-size:.8rem;color:hsla(0,0%,100%,.5);margin-top:4px}.results-actions{gap:14px}.difficulty-selector,.results-actions{display:flex;justify-content:center;flex-wrap:wrap}.difficulty-selector{gap:10px;margin-bottom:30px}.difficulty-btn{padding:8px 20px;border-radius:20px;border:2px solid hsla(0,0%,100%,.2);background:transparent;color:hsla(0,0%,100%,.6);cursor:pointer;transition:all .3s ease;font-size:.9rem;font-weight:500}.difficulty-btn:hover{border-color:#e94560;color:#e94560}.difficulty-btn.active{background:#e94560;border-color:#e94560;color:#fff}.section-title{font-size:1rem;color:hsla(0,0%,100%,.5);text-align:center;margin-bottom:14px;text-transform:uppercase;letter-spacing:1px;font-size:.8rem}