@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--bg-light:#f9fafb;--indigo-primary:#4f46e5;--indigo-hover:#4338ca;--text-primary:#111827;--text-secondary:#6b7280;--card-bg:#fff}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-light);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,sans-serif;overflow-x:hidden}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes progressLoad{0%{width:0%}to{width:100%}}.fade-in{animation:.6s ease-out forwards fadeIn}.navbar{justify-content:space-between;align-items:center;padding:1.5rem 2rem;display:flex}.logo-text{color:var(--indigo-primary);letter-spacing:-.5px;font-size:1.5rem;font-weight:700}.nav-icons{gap:1rem;display:flex}.icon-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;padding:.5rem;transition:background-color .2s,color .2s;display:flex}.icon-btn:hover{color:var(--indigo-primary);background-color:#f3f4f6}.card-wrapper{flex:1;justify-content:center;align-items:center;padding:2rem;display:flex}.card{background-color:var(--card-bg);text-align:center;border-radius:20px;width:100%;padding:2.5rem 2rem;box-shadow:0 10px 15px -3px #0000000d,0 4px 6px -2px #00000005}.start-screen-container{flex-direction:column;min-height:100vh;display:flex}.card-title{color:var(--indigo-primary);letter-spacing:-.8px;margin-bottom:.5rem;font-size:2.25rem;font-weight:800}.card-subtitle{color:var(--text-secondary);margin-bottom:2.5rem;font-size:1rem}.brain-image{object-fit:cover;border-radius:50%;width:180px;height:180px;margin-bottom:2rem;animation:4s ease-in-out infinite float;box-shadow:0 10px 25px #4f46e526}@keyframes 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#4f46e559}.loading-screen-container{background-color:var(--bg-light);flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:2rem;display:flex}.loading-content{width:100%;max-width:400px;margin-bottom:5rem}.loading-card{margin-bottom:1.5rem}.loading-image-placeholder{background-color:#f5f3ff;border-radius:20px;justify-content:center;align-items:center;width:80px;height:80px;margin:0 auto 2rem;display:flex}.bulb-icon{color:var(--indigo-primary)}.spinner-container{margin-bottom:1.5rem}.spinner{border:4px solid #e5e7eb;border-top-color:var(--indigo-primary);border-radius:50%;width:40px;height:40px;margin:0 auto;animation:1s linear infinite spin}.loading-title{color:var(--text-primary);margin-bottom:.5rem;font-size:1.5rem;font-weight:700}.loading-subtext{color:var(--text-secondary);margin-bottom:2rem;font-size:.9rem}.loading-progress-container{background-color:#f3f4f6;border-radius:999px;height:6px;overflow:hidden}.loading-progress-bar{background-color:var(--indigo-primary);width:0%;height:100%;animation:1.5s ease-in-out infinite progressLoad}.info-cards-container{flex-direction:column;gap:1rem;display:flex}.info-mini-card{background-color:#fff;border-radius:16px;align-items:center;gap:1rem;padding:1rem;display:flex;box-shadow:0 4px 6px -1px #0000000d}.info-mini-icon{border-radius:12px;justify-content:center;align-items:center;width:40px;height:40px;display:flex}.info-mini-icon.tip{color:#d97706;background-color:#fef3c7}.info-mini-icon.streak{color:#ef4444;background-color:#fef2f2}.info-mini-text{flex-direction:column;display:flex}.info-mini-label{color:var(--text-secondary);font-size:.75rem;font-weight:600}.info-mini-val{color:var(--text-primary);font-size:.9rem;font-weight:700}.bottom-nav{background-color:#fff;border-top:1px solid #f3f4f6;justify-content:space-around;width:100%;padding:1rem;display:flex;position:fixed;bottom:0;left:0;box-shadow:0 -4px 6px -1px #00000005}.nav-item{color:#9ca3af;cursor:pointer;background:0 0;border:none;flex-direction:column;align-items:center;gap:.25rem;display:flex}.nav-item.active{color:var(--indigo-primary)}.nav-item span{font-size:.7rem;font-weight:600}.quiz-card{text-align:left;max-width:550px}.quiz-header{margin-bottom:2rem}.quiz-info-row{justify-content:space-between;align-items:center;margin-bottom:.75rem;display:flex}.question-count{color:var(--indigo-primary);font-size:.9rem;font-weight:700}.timer-display{color:var(--text-primary);background-color:#f3f4f6;border-radius:10px;align-items:center;gap:.4rem;padding:.4rem .8rem;font-size:.95rem;font-weight:800;transition:all .3s;display:flex}.timer-display.critical{color:#ef4444;background-color:#fef2f2;animation:1s infinite pulse}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}.progress-container{background-color:#f3f4f6;border-radius:999px;height:10px;overflow:hidden}.progress-bar{background:linear-gradient(90deg, var(--indigo-primary), #818cf8);height:100%;transition:width .4s 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.option-index{color:#fff;background-color:#10b981;border-color:#10b981}.option-button.wrong{background-color:#fef2f2;border-color:#ef4444}.option-button.wrong .option-index{color:#fff;background-color:#ef4444;border-color:#ef4444}.next-button{background:linear-gradient(135deg, var(--indigo-primary), var(--indigo-hover));color:#fff;cursor:pointer;border:none;border-radius:14px;padding:1rem 2rem;font-weight:700;transition:all .3s;box-shadow:0 4px 15px #4f46e54d}.next-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #4f46e566}.hint-btn{color:#d97706;cursor:pointer;background-color:#fffbeb;border:1px solid #fef3c7;border-radius:10px;align-items:center;gap:.5rem;padding:.6rem 1rem;font-size:.85rem;font-weight:700;transition:all .2s;display:flex}.hint-btn:hover{background-color:#fef3c7;transform:scale(1.05)}.result-card{max-width:450px}.score-circle{border:10px solid #f3f4f6;border-top-color:var(--indigo-primary);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:140px;height:140px;margin:0 auto 2rem;display:flex;box-shadow:inset 0 0 0 1px #f3f4f6}.score-number{color:var(--indigo-primary);font-size:3rem;font-weight:900;line-height:1}.score-total{color:var(--text-secondary);font-size:1rem;font-weight:700}.performance-message{color:var(--text-primary);letter-spacing:-.5px;margin-bottom:.5rem;font-size:2rem;font-weight:800}.result-subtitle{color:var(--text-secondary);margin-bottom:2.5rem;font-size:1rem}.stats-grid{grid-template-columns:1fr 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.5s}.primary-action-btn.restart:hover svg{transform:rotate(180deg)}.secondary-actions{grid-template-columns:1fr 1fr;gap:.75rem;display:grid}.secondary-action-btn{color:var(--text-primary);cursor:pointer;background-color:#f3f4f6;border:none;border-radius:12px;justify-content:center;align-items:center;gap:.5rem;padding:1rem;font-size:.95rem;font-weight:700;transition:all .2s;display:flex}.secondary-action-btn:hover{background-color:#e5e7eb;transform:translateY(-2px)}.home-link-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;margin-top:1rem;font-size:.9rem;font-weight:700;text-decoration:underline}.option-button.selected{border-color:var(--indigo-primary);background-color:#f5f3ff;transform:translate(4px);box-shadow:0 4px 12px #0000000d}.option-button.selected .option-index{background-color:var(--indigo-primary);color:#fff;border-color:var(--indigo-primary)}.review-card{text-align:left!important;max-width:600px!important}.review-title{color:var(--text-primary);margin-bottom:.5rem;font-size:1.75rem;font-weight:800}.review-subtitle{color:var(--text-secondary);margin-bottom:2rem;font-size:.95rem}.review-list{flex-direction:column;gap:1.5rem;max-height:500px;margin-bottom:2.5rem;padding-right:.5rem;display:flex;overflow-y:auto}.review-list::-webkit-scrollbar{width:6px}.review-list::-webkit-scrollbar-thumb{background-color:#e5e7eb;border-radius:10px}.review-item{background-color:#fff;border:1px solid #f3f4f6;border-radius:16px;padding:1.25rem}.review-item.correct{border-left:4px solid #10b981}.review-item.wrong{border-left:4px solid #ef4444}.review-question-header{justify-content:space-between;align-items:center;margin-bottom:.75rem;display:flex}.review-index{color:var(--text-secondary);text-transform:uppercase;font-size:.75rem;font-weight:700}.status-tag{border-radius:6px;align-items:center;gap:.35rem;padding:.25rem .6rem;font-size:.75rem;font-weight:700;display:flex}.status-tag.correct{color:#059669;background-color:#ecfdf5}.status-tag.wrong{color:#dc2626;background-color:#fef2f2}.review-question-text{color:var(--text-primary);margin-bottom:1.25rem;font-size:1.1rem;font-weight:700;line-height:1.4}.review-answers{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.answer-box{flex-direction:column;gap:.25rem;display:flex}.answer-label{color:var(--text-secondary);font-size:.7rem;font-weight:600}.answer-val{font-size:.9rem;font-weight:700}.answer-val.correct{color:#10b981}.answer-val.wrong{color:#ef4444}.answer-val.correct-val{color:#10b981}@media (width<=480px){.review-answers{grid-template-columns:1fr}}.profile-card{max-width:500px}.profile-header{margin-bottom:2.5rem}.avatar-circle{background-color:#f5f3ff;border:4px solid #fff;border-radius:50%;justify-content:center;align-items:center;width:100px;height:100px;margin:0 auto 1.5rem;display:flex;box-shadow:0 4px 10px #4f46e51a}.avatar-icon{color:var(--indigo-primary)}.user-name{color:var(--text-primary);margin-bottom:.25rem;font-size:1.75rem;font-weight:800}.user-tag{color:var(--text-secondary);font-size:.9rem;font-weight:500}.stats-summary-grid{background-color:#f9fafb;border-radius:20px;grid-template-columns:repeat(4,1fr);gap:.5rem;margin-bottom:2.5rem;padding:1.5rem .5rem;display:grid}.summary-stat{flex-direction:column;gap:.25rem;display:flex}.summary-val{color:var(--indigo-primary);font-size:1.15rem;font-weight:800}.summary-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;font-size:.65rem;font-weight:700}.performance-grid{grid-template-columns:1fr;gap:1rem;margin-bottom:2.5rem;display:grid}.perf-card{background-color:#fff;border:1px solid #f3f4f6;border-radius:16px;align-items:center;gap:1rem;padding:1.25rem;transition:transform .2s;display:flex}.perf-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000000d}.perf-icon{border-radius:12px;justify-content:center;align-items:center;width:40px;height:40px;display:flex}.perf-icon.streak{color:#ef4444;background-color:#fef2f2}.perf-icon.points{color:#7c3aed;background-color:#f5f3ff}.perf-icon.accuracy{color:#059669;background-color:#ecfdf5}.perf-info{flex-direction:column;align-items:flex-start;display:flex}.perf-label{color:var(--text-secondary);font-size:.75rem;font-weight:600}.perf-val{color:var(--text-primary);font-size:1rem;font-weight:700}.activity-section{text-align:left;margin-bottom:2.5rem}.section-header{color:var(--text-primary);align-items:center;gap:.5rem;margin-bottom:1.25rem;font-size:.9rem;font-weight:700;display:flex}.activity-list{flex-direction:column;gap:.75rem;display:flex}.activity-item{background-color:#f9fafb;border-radius:12px;justify-content:space-between;align-items:center;padding:1rem;display:flex}.activity-date{color:var(--text-secondary);align-items:center;gap:.5rem;font-size:.8rem;font-weight:500;display:flex}.activity-result{color:var(--text-primary);font-size:.85rem;font-weight:700}.res-val{color:var(--indigo-primary)}.no-activity{text-align:center;color:var(--text-secondary);padding:1rem;font-size:.85rem}.settings-card{text-align:left;max-width:500px}.settings-header{flex-direction:column;align-items:center;margin-bottom:2.5rem;display:flex}.settings-main-icon{color:var(--indigo-primary);margin-bottom:1rem}.settings-title{color:var(--text-primary);font-size:1.75rem;font-weight:800}.settings-sections{flex-direction:column;gap:2rem;display:flex}.section-title{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid #f3f4f6;margin-bottom:1.25rem;padding-bottom:.5rem;font-size:1rem;font-weight:700}.setting-item{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.setting-info{color:var(--text-primary);align-items:center;gap:1rem;font-weight:600;display:flex}.toggle-btn{cursor:pointer;border:none;border-radius:20px;width:44px;height:24px;transition:background-color .3s;position:relative}.toggle-btn.on{background-color:var(--indigo-primary)}.toggle-btn.off{background-color:#d1d5db}.toggle-slider{background-color:#fff;border-radius:50%;width:18px;height:18px;transition:transform .3s;position:absolute;top:3px;left:3px;box-shadow:0 1px 3px #0000001a}.toggle-btn.on .toggle-slider{transform:translate(20px)}.setting-control{margin-bottom:1.5rem}.control-label{color:var(--text-primary);align-items:center;gap:.5rem;margin-bottom:1rem;font-size:.9rem;font-weight:700;display:flex}.option-chips{flex-wrap:wrap;gap:.75rem;display:flex}.chip{color:var(--text-secondary);cursor:pointer;background-color:#fff;border:2px solid #f3f4f6;border-radius:10px;padding:.5rem 1rem;font-size:.85rem;font-weight:700;transition:all .2s}.chip:hover{border-color:#e5e7eb}.chip.active{border-color:var(--indigo-primary);color:var(--indigo-primary);background-color:#f5f3ff}.settings-actions{flex-direction:column;gap:1rem;margin-top:1rem;display:flex}.reset-link-btn{color:#ef4444;cursor:pointer;background:0 0;border:none;font-size:.9rem;font-weight:700;text-decoration:underline}@media (width>=480px){.performance-grid{grid-template-columns:repeat(3,1fr)}}.logout-button{color:#ef4444;cursor:pointer;background:0 0;border:2px solid #ef4444;border-radius:14px;justify-content:center;align-items:center;gap:.5rem;width:100%;margin-top:.75rem;padding:12px 24px;font-size:1rem;font-weight:700;transition:all .3s cubic-bezier(.4,0,.2,1);display:inline-flex}.logout-button:hover{background-color:#fef2f2;transform:translateY(-2px);box-shadow:0 4px 12px #ef44441a}.logout-button:active{transform:translateY(0)}.difficulty-selector{text-align:left;width:100%;margin-bottom:2rem}.section-title{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:1rem;font-size:.9rem;font-weight:700}.difficulty-options{flex-direction:column;gap:.75rem;display:flex}.difficulty-card{cursor:pointer;text-align:left;background-color:#f9fafb;border:2px solid #f3f4f6;border-radius:16px;justify-content:space-between;align-items:center;padding:1rem 1.25rem;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.difficulty-card:hover{border-color:var(--level-color);background-color:#fff;transform:translate(4px)}.difficulty-card.active{border-color:var(--level-color);background-color:#fff;box-shadow:0 4px 12px #0000000d}.difficulty-info{flex-direction:column;display:flex}.difficulty-label{color:var(--text-primary);font-size:1rem;font-weight:700}.difficulty-desc{color:var(--text-secondary);font-size:.75rem}.chevron-icon{color:var(--text-secondary);transition:transform .2s}.difficulty-card.active .chevron-icon{color:var(--level-color);transform:translate(4px)}