:root{--quiz-primary:#ff6b6b;--quiz-secondary:#4ecdc4;--quiz-accent:#ffe66d;--quiz-bg:#f7f9fc;--quiz-text:#2d3436;--quiz-correct:#27ae60;--quiz-wrong:#e74c3c;--quiz-card-bg:#fff;--quiz-radius:24px}.quiz-container{background-color:var(--quiz-bg);min-height:100vh;color:var(--quiz-text);flex-direction:column;align-items:center;padding:20px;font-family:Inter,system-ui,-apple-system,sans-serif;display:flex}.quiz-card{background:var(--quiz-card-bg);border-radius:var(--quiz-radius);width:100%;max-width:600px;margin-top:20px;padding:40px;animation:.5s ease-out slideUp;position:relative;overflow:hidden;box-shadow:0 10px 30px #0000000d}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.quiz-header{text-align:center;margin-bottom:30px}.quiz-title{color:var(--quiz-primary);margin-bottom:10px;font-size:2rem;font-weight:800}.progress-container{background:#eee;border-radius:999px;width:100%;height:12px;margin-bottom:20px;overflow:hidden}.progress-bar{background:linear-gradient(90deg, var(--quiz-primary), var(--quiz-secondary));height:100%;transition:width .4s cubic-bezier(.175,.885,.32,1.275)}.question-text{text-align:center;margin-bottom:30px;font-size:1.5rem;font-weight:700;line-height:1.4}.options-grid{flex-direction:column;gap:15px;display:flex}.option-button{cursor:pointer;text-align:left;background:#fff;border:3px solid #f0f0f0;border-radius:20px;align-items:center;gap:15px;padding:20px;font-size:1.2rem;font-weight:600;transition:all .2s;display:flex}.option-button:hover:not(:disabled){border-color:var(--quiz-secondary);background:#f0fff4;transform:translateY(-2px)}.option-button:active:not(:disabled){transform:scale(.98)}.option-button.correct{background:var(--quiz-correct)!important;color:#fff!important;border-color:var(--quiz-correct)!important}.option-button.wrong{background:var(--quiz-wrong)!important;color:#fff!important;border-color:var(--quiz-wrong)!important}.option-button.highlight-correct{border-color:var(--quiz-correct);background:#e8f5e9;box-shadow:0 0 0 4px #27ae6033}.feedback-area{background:#f8f9fa;border-radius:20px;margin-top:30px;padding:20px;animation:.3s ease-in fadeIn}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.explanation{color:#636e72;margin-bottom:20px;font-size:1.1rem;font-weight:500}.next-button{background:var(--quiz-primary);color:#fff;cursor:pointer;border:none;border-radius:20px;width:100%;padding:18px;font-size:1.3rem;font-weight:700;transition:all .2s;box-shadow:0 6px 20px #ff6b6b4d}.next-button:hover{transform:translateY(-3px);box-shadow:0 10px 25px #ff6b6b66}.tts-button{border:2px solid var(--quiz-secondary);color:var(--quiz-secondary);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:8px;margin:0 auto 20px;padding:8px 16px;font-weight:600;transition:all .2s;display:flex}.tts-button:hover{background:var(--quiz-secondary);color:#fff}.level-badge{background:var(--quiz-accent);color:#a38100;border-radius:999px;margin-bottom:15px;padding:4px 12px;font-size:.8rem;font-weight:800;display:inline-block}.result-screen{text-align:center;animation:.5s cubic-bezier(.34,1.56,.64,1) zoomIn}@keyframes zoomIn{0%{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}.score-text{color:var(--quiz-primary);margin:20px 0;font-size:3rem;font-weight:900}.start-screen{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:60vh;display:flex}.quiz-header-fixed{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:100;background:#ffffffe6;border-radius:0 0 20px 20px;justify-content:space-between;align-items:center;width:100%;max-width:600px;margin-bottom:20px;padding:15px 20px;display:flex;position:sticky;top:0;box-shadow:0 4px 15px #0000000d}.questions-list{flex-direction:column;gap:30px;width:100%;max-width:600px;display:flex}.question-item{border:2px solid #0000;margin-top:0;transition:all .3s}.question-item.answered{background-color:#fafafa;border-color:#e0e0e0}.question-header{justify-content:space-between;align-items:center;margin-bottom:15px;display:flex}.q-number{color:var(--quiz-primary);font-size:1.1rem;font-weight:800}.tts-button-small{cursor:pointer;background:#f0f0f0;border:none;border-radius:12px;padding:5px 12px;font-size:.9rem;font-weight:600}.explanation-box{border-left:5px solid var(--quiz-secondary);background:#fff;border-radius:8px;margin-top:20px;padding:15px;font-weight:600;animation:.3s slideIn}@keyframes slideIn{0%{opacity:0;transform:translate(-10px)}to{opacity:1;transform:translate(0)}}.footer-actions{width:100%;max-width:600px;padding:40px 0}.pulse{animation:2s infinite pulse-animation}@keyframes pulse-animation{0%{transform:scale(1)}50%{transform:scale(1.02)}to{transform:scale(1)}}.page-indicator,.score-badge{color:#555;font-size:.9rem;font-weight:700}.confetti-burst{pointer-events:none;z-index:10000;background:0 0;border-radius:50%;width:10px;height:10px;animation:1s ease-out forwards burst;position:fixed;top:50%;left:50%;box-shadow:-100px -100px #ff6b6b,100px -100px #4ecdc4,-100px 100px #ffe66d,100px 100px #ff6b6b,0 -150px #4ecdc4,0 150px #ffe66d,-150px 0 #ff6b6b,150px 0 #4ecdc4}@keyframes burst{0%{opacity:1;transform:scale(0)}to{opacity:0;transform:scale(4)}}