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1rem}.navigation-panel{flex-direction:column}.stats-grid{grid-template-columns:1fr}.score-number{font-size:3rem}.score-total{font-size:2rem}.results-actions{flex-direction:column}.results-actions button{width:100%}}.loading-overlay{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.5rem;padding:3rem}.loading-spinner{width:60px;height:60px;border:5px solid rgba(100,108,255,.2);border-top-color:#646cff;border-radius:50%;animation:spin 1s linear infinite}.loading-overlay p{font-size:1.2rem;color:#646cff;font-weight:600}@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.app-container,.quiz-container,.file-selection,.chapter-selection,.results-container,.review-container{animation:fadeIn .5s ease-out}.question-count{position:relative;padding-bottom:.5rem}.question-count:after{content:"";position:absolute;bottom:0;left:0;height:3px;background:linear-gradient(90deg,#667eea,#764ba2);border-radius:2px;transition:width .3s ease}