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#00000026}.back-button:hover{background:#ffffff4d;border-color:#ffffff80;transform:translateY(-1px)}@media (max-width: 768px){.file-upload-container{padding:15px}.upload-title{font-size:2rem}.upload-content{grid-template-columns:1fr;gap:20px}.format-info,.upload-section{padding:20px}.format-example{padding:15px}.format-example pre{font-size:.8rem}.file-drop-zone{padding:30px 15px}.upload-icon{font-size:3rem}.success-actions{flex-direction:column}.start-quiz-btn,.upload-another-btn,.try-again-btn{width:100%}}@media (max-width: 480px){.upload-title{font-size:1.8rem}.upload-description{font-size:1rem}.format-info,.upload-section{padding:15px}.file-drop-zone{padding:25px 10px}.drop-text{font-size:1rem}.browse-button{padding:10px 20px;font-size:.95rem}}[data-theme=dark] .file-drop-zone{border-color:#404040}[data-theme=dark] .file-drop-zone:hover,[data-theme=dark] .file-drop-zone.drag-active{border-color:#2196f3;background:#2196f326}[data-theme=dark] .format-example{border-left-color:#2196f3}.quiz-app-container{max-width:1200px;margin:0 auto;padding:20px;min-height:100vh;display:flex;align-items:center;justify-content:center}.main-menu{width:100%;text-align:center}.menu-header{margin-bottom:50px}.app-subtitle{font-size:1.2rem;color:#ffffffe6;max-width:600px;margin:0 auto;line-height:1.6}.menu-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(400px,1fr));gap:30px;margin-bottom:50px}.quiz-option{perspective:1000px}.option-card{background:var(--bg-primary);border-radius:20px;padding:40px 30px;box-shadow:0 15px 35px var(--shadow);transition:all .4s cubic-bezier(.4,0,.2,1);border:1px solid var(--border);height:100%;display:flex;flex-direction:column;position:relative;overflow:hidden}.option-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(135deg,#667eea,#764ba2,#f093fb);z-index:1}.option-card:hover{transform:translateY(-10px) rotateX(5deg);box-shadow:0 25px 50px #0003}.default-option:before{background:linear-gradient(135deg,#667eea,#764ba2,#f093fb)}.custom-option:before{background:linear-gradient(135deg,#56ab2f,#a8e6cf,#00b894)}.option-icon{font-size:4rem;margin-bottom:20px;display:block}.option-title{font-size:1.8rem;font-weight:700;color:var(--text-primary);margin-bottom:15px}.option-description{font-size:1rem;color:var(--text-secondary);line-height:1.6;margin-bottom:25px;flex-grow:1}.option-features{list-style:none;padding:0;margin:0 0 30px;text-align:left}.option-features li{color:var(--text-secondary);font-size:.95rem;position:relative;padding:8px 0 8px 25px}.option-features li:before{content:"✓";color:#4caf50;font-weight:700;position:absolute;left:0;top:8px}.option-button{padding:16px 32px;border:none;border-radius:50px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .4s 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scale(.98)}.menu-footer{margin-top:40px}.feature-highlights{display:flex;justify-content:center;gap:40px;flex-wrap:wrap}.feature{display:flex;align-items:center;gap:10px;color:#fffc;font-size:.95rem;font-weight:500}.feature-icon{font-size:1.2rem}.contact-footer{margin-top:30px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1)}.contact-text{color:#ffffffb3;font-size:.9rem;margin:0}.contact-email{color:#667eea;text-decoration:none;font-weight:500;margin-left:8px;transition:color .3s ease}.contact-email:hover{color:#764ba2;text-decoration:underline}[data-theme=dark] .contact-email{color:#81c784}[data-theme=dark] .contact-email:hover{color:#66bb6a}[data-theme=dark] .contact-footer{border-top-color:#ffffff0d}@media (max-width: 768px){.quiz-app-container{padding:15px}.app-subtitle{font-size:1rem}.menu-options{grid-template-columns:1fr;gap:20px}.option-card{padding:30px 20px}.option-card:hover{transform:translateY(-5px)}.option-icon{font-size:3rem}.option-title{font-size:1.5rem}.option-description{font-size:.95rem}.feature-highlights{gap:20px}.feature{font-size:.9rem}}@media (max-width: 480px){.menu-header{margin-bottom:30px}.option-card{padding:25px 15px}.option-icon{font-size:2.5rem}.option-title{font-size:1.3rem}.feature-highlights{flex-direction:column;align-items:center;gap:15px}.feature{font-size:.85rem}}.option-card{animation:fadeInUp .6s ease forwards;opacity:0;transform:translateY(30px)}.quiz-option:nth-child(1) .option-card{animation-delay:.1s}.quiz-option:nth-child(2) .option-card{animation-delay:.2s}@keyframes fadeInUp{to{opacity:1;transform:translateY(0)}}.menu-header{animation:fadeIn .8s ease forwards}.menu-footer{animation:fadeIn 1s ease forwards;animation-delay:.3s;opacity:0}@keyframes fadeIn{to{opacity:1}}@media (prefers-contrast: high){.option-card{border-width:2px}.option-button{border:2px solid currentColor}}@media (prefers-reduced-motion: reduce){.option-card,.menu-header,.menu-footer{animation:none;opacity:1;transform:none}.option-card:hover,.option-button:hover{transform:none}}.logo{width:80px;height:80px;margin:0 auto 20px;display:block;border-radius:50%;box-shadow:0 8px 25px #00000026;transition:all .3s ease;background:#fff;padding:10px;object-fit:contain}[data-theme=dark] .logo{background:#ffffff1a;box-shadow:0 8px 25px #0000004d}.logo:hover{transform:scale(1.05) rotate(5deg);box-shadow:0 12px 35px #0003}.logo{animation:logoFadeIn .8s ease forwards;opacity:0;transform:translateY(-20px) scale(.8)}@keyframes logoFadeIn{to{opacity:1;transform:translateY(0) scale(1)}}@media (max-width: 768px){.logo{width:60px;height:60px;margin-bottom:15px}}@media (max-width: 480px){.logo{width:50px;height:50px;margin-bottom:10px}}@media (prefers-contrast: high){.logo{border:2px solid var(--text-primary)}}@media (prefers-reduced-motion: 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.theme-toggle-thumb{transform:translateY(-50%) translate(36px);background:linear-gradient(135deg,#2d3436,#636e72);border-color:#74b9ff4d;box-shadow:0 4px 12px #74b9ff33,0 2px 6px #0000004d}[data-theme=dark] .theme-toggle-thumb:before{background:linear-gradient(135deg,#74b9ff4d,#74b9ff1a)}@media (max-width: 768px){.theme-toggle{top:15px;right:15px;padding:6px}.theme-toggle-track{width:60px;height:30px;border-radius:20px}.theme-toggle-thumb{width:24px;height:24px;font-size:14px}[data-theme=dark] .theme-toggle-thumb{transform:translateY(-50%) translate(30px)}}@media (max-width: 480px){.theme-toggle{top:10px;right:10px;padding:4px}.theme-toggle-track{width:50px;height:26px;border-radius:18px}.theme-toggle-thumb{width:20px;height:20px;font-size:12px}[data-theme=dark] .theme-toggle-thumb{transform:translateY(-50%) translate(24px)}}:root{--bg-primary: rgba(255, 255, 255, .95);--bg-secondary: rgba(248, 249, 250, .9);--text-primary: #2c3e50;--text-secondary: #5a6c7d;--text-muted: 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