:root{--grid-min-card: 240px;--grid-min-card-sm: 180px;--grid-min-stat: 140px;--grid-gap: 1rem;--grid-gap-sm: .5rem;--container-xs: 100%;--container-sm: 540px;--container-md: 720px;--container-lg: 960px;--container-xl: 1140px}.grid-responsive{display:grid;grid-template-columns:repeat(auto-fit,minmax(var(--grid-min-card),1fr));gap:var(--grid-gap)}.grid-responsive-sm{display:grid;grid-template-columns:repeat(auto-fit,minmax(var(--grid-min-card-sm),1fr));gap:var(--grid-gap)}.grid-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(var(--grid-min-stat),1fr));gap:12px}.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:var(--grid-gap)}.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:var(--grid-gap)}.mobile-only{display:none!important}.desktop-only{display:block!important}@media (max-width: 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(min-width: 414px) and (max-width: 479px){:root{--grid-min-card: 180px}}@media (min-width: 480px) and (max-width: 599px){:root{--grid-min-card: 200px}}@media (min-width: 600px) and (max-width: 767px){:root{--grid-min-card: 220px;--grid-min-card-sm: 160px}}@media (min-width: 768px){:root{--grid-min-card: 240px}}@media (min-width: 1024px){:root{--grid-min-card: 260px}}@media (min-width: 1280px){:root{--grid-min-card: 280px}}@media (min-width: 1920px){:root{--grid-min-card: 300px}}.table-responsive{overflow-x:auto;-webkit-overflow-scrolling:touch}@media (pointer: coarse){.touch-target{min-height:44px;min-width:44px}.touch-target-sm{min-height:36px;min-width:36px}}@media (hover: none){.hover-highlight:hover{background:inherit;border-color:inherit}.hover-highlight:active{opacity:.8}}@supports (padding: env(safe-area-inset-bottom)){.safe-area-top{padding-top:env(safe-area-inset-top)}.safe-area-bottom{padding-bottom:env(safe-area-inset-bottom)}.safe-area-left{padding-left:env(safe-area-inset-left)}.safe-area-right{padding-right:env(safe-area-inset-right)}.safe-area-x{padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}.safe-area-y{padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}.safe-area-all{padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}}@media (orientation: landscape) and (max-height: 500px){.landscape-compact{padding:8px!important;margin-bottom:6px!important}}@media 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12px;background:#5cb85c33;color:var(--primary);border-radius:20px;font-size:.8rem;font-weight:500;margin-bottom:16px}.question-text{font-size:1.25rem;line-height:1.6;margin-bottom:24px}.options-list{display:flex;flex-direction:column;gap:12px}.option-btn{display:flex;align-items:center;gap:16px;width:100%;padding:16px;background:var(--bg-input);border:2px solid var(--border);border-radius:12px;cursor:pointer;transition:all .2s;text-align:left;color:var(--text)}.option-btn:hover:not(:disabled){border-color:var(--primary);background:#5cb85c1a}.option-btn.selected{border-color:var(--primary);background:#5cb85c1a}.option-btn.correct{border-color:var(--success);background:#4caf501a}.option-btn.wrong{border-color:var(--error);background:#ef44441a}.option-btn:disabled{cursor:default}.option-letter{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--border);border-radius:50%;font-weight:600;flex-shrink:0}.option-btn.correct .option-letter{background:var(--success);color:#fff}.option-btn.wrong .option-letter{background:var(--error);color:#fff}.option-text{flex:1}.feedback{margin-top:24px;padding:20px;border-radius:12px;animation:slideUp .3s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.feedback.correct{background:#4caf501a;border:1px solid var(--success)}.feedback.wrong{background:#ef44441a;border:1px solid var(--error)}.feedback-title{font-weight:600;font-size:1.1rem;margin-bottom:8px}.feedback.correct .feedback-title{color:var(--success)}.feedback.wrong .feedback-title{color:var(--error)}.feedback-explanation{color:var(--text-muted);margin-bottom:16px;line-height:1.6}.result-container{text-align:center;padding:48px 24px}.result-emoji{font-size:5rem;margin-bottom:16px}.result-title{font-size:2rem;margin-bottom:24px}.result-score{display:flex;align-items:baseline;justify-content:center;gap:4px;margin-bottom:8px}.score-big{font-size:4rem;font-weight:700;color:var(--primary)}.result-percent{font-size:1.25rem;color:var(--text-muted);margin-bottom:32px}.result-actions{display:flex;flex-direction:column;gap:12px;max-width:300px;margin:0 auto}.review-header{display:flex;align-items:center;gap:16px;margin-bottom:24px;flex-wrap:wrap}.review-header h2{flex:1;margin:0}.review-score{color:var(--text-muted);font-size:.95rem}.review-list{display:flex;flex-direction:column;gap:16px}.review-card{background:var(--bg-card);border-radius:12px;padding:20px;border-left:4px solid 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h3{font-size:1.05rem;font-weight:600;color:var(--text);margin-bottom:.5rem}.landing-feature-card p{font-size:.875rem;color:var(--text-muted);line-height:1.5}.landing-topics{padding:3rem 0 2rem}.topic-search{display:flex;align-items:center;gap:10px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:10px 16px;margin-bottom:24px;transition:border-color .2s}.topic-search:focus-within{border-color:var(--primary)}.topic-search-icon{font-size:1.1rem;flex-shrink:0}.topic-search-input{flex:1;background:none;border:none;outline:none;color:var(--text);font-size:1rem;font-family:inherit}.topic-search-input::placeholder{color:var(--text-muted)}.topic-search-clear{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:1rem;padding:2px 6px;border-radius:50%;transition:background .2s}.topic-search-clear:hover{background:var(--bg-hover);color:var(--text)}.hero{text-align:center;padding:48px 24px;margin-bottom:32px}.hero h1{font-size:2.5rem;font-weight:700;margin-bottom:12px;background:linear-gradient(145deg,var(--primary) 0%,var(--secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero p{font-size:1.1rem;color:var(--text-muted)}.section-title{font-size:1.1rem;font-weight:600;color:var(--text-muted);margin-bottom:16px;margin-top:32px}.category-section{margin-top:24px}.category-title{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--text);margin-bottom:16px;padding-bottom:8px;border-bottom:2px solid var(--border)}.category-icon{font-size:1.5rem}.category-card{display:flex;align-items:center;gap:20px;width:100%;padding:24px;background:var(--bg-card);border:2px solid var(--border);border-radius:16px;cursor:pointer;transition:all .25s ease;text-align:left;color:var(--text);font-family:inherit;font-size:inherit}.category-card:hover{border-color:var(--category-color, var(--primary));transform:translateY(-2px);box-shadow:0 8px 24px #00000026}.category-card.expanded{border-color:var(--category-color, var(--primary));border-bottom-left-radius:0;border-bottom-right-radius:0;border-bottom:2px solid var(--category-color, var(--primary));box-shadow:0 4px 12px #0000001a}.category-card-icon{font-size:3rem;flex-shrink:0}.category-card-info{flex:1;min-width:0}.category-card-info h2{font-size:1.35rem;font-weight:700;margin-bottom:4px;color:var(--text)}.category-card-info p{font-size:.9rem;color:var(--text-muted);margin-bottom:6px}.category-card-stats{font-size:.8rem;color:var(--text-muted)}.category-chevron{font-size:.85rem;color:var(--text-muted);transition:transform .3s ease;flex-shrink:0}.category-chevron.rotated{transform:rotate(180deg)}.category-topics{max-height:0;overflow:hidden;transition:max-height .35s ease}.category-topics.open{max-height:1200px}.category-topics-inner{display:flex;flex-direction:column;gap:8px;padding:12px;background:var(--bg-card);border:2px solid var(--category-color, var(--border));border-top:none;border-bottom-left-radius:16px;border-bottom-right-radius:16px}.category-topics-inner .topic-card{border-radius:12px;border-width:1px}.topic-card{display:flex;flex-direction:row;align-items:center;gap:16px;padding:20px;background:var(--bg-card);border:2px solid var(--border);border-radius:16px;cursor:pointer;transition:all .2s;text-align:left;width:100%;color:var(--text);font-family:inherit}.topic-card:hover{border-color:var(--topic-color, var(--primary));transform:translateY(-2px);box-shadow:0 8px 24px #00000026}.topic-info{flex:1}.topic-info h3{font-size:1.1rem;font-weight:600;margin-bottom:4px}.topic-info p{font-size:.875rem;color:var(--text-muted)}.topic-arrow{font-size:1.25rem;color:var(--text-muted);transition:transform .2s}.topic-card:hover .topic-arrow{transform:translate(4px);color:var(--topic-color, var(--primary))}.mixed-card{background:linear-gradient(145deg,#5cb85c1a,#764ba21a);border-color:#5cb85c4d}.mixed-card .topic-info h3,.mixed-card .topic-info p{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mixed-quiz-section{margin-bottom:24px}.mixed-quiz-section .topic-card{width:100%}.quiz-complete{text-align:center;padding:48px 24px}.complete-emoji{font-size:5rem;margin-bottom:16px;animation:bounce .6s ease}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}.quiz-complete h2{font-size:2rem;margin-bottom:24px}.score-display{display:flex;align-items:baseline;justify-content:center;gap:4px;margin-bottom:8px}.score-correct{font-size:4rem;font-weight:700;color:var(--primary)}.score-divider,.score-total{font-size:2rem;color:var(--text-muted)}.score-percent{font-size:1.25rem;color:var(--text-muted);margin-bottom:24px}.quiz-topic-badge{display:inline-block;padding:8px 16px;background:#5cb85c33;color:var(--primary);border-radius:20px;font-size:.9rem;font-weight:500;margin-bottom:32px}.button-group{display:flex;flex-direction:column;gap:12px;max-width:300px;margin:24px auto 0}.btn-back{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:.9rem;padding:8px 0;transition:color .2s}.btn-back:hover{color:var(--primary)}.progress-text{font-size:.875rem;color:var(--text-muted);margin-bottom:8px;display:block}.question-topic{display:inline-block;padding:4px 12px;background:#5cb85c33;color:var(--primary);border-radius:20px;font-size:.8rem;font-weight:500;margin-bottom:16px}.stats-overview{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:32px}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:24px;text-align:center}.stat-value{display:block;font-size:2rem;font-weight:700;color:var(--primary);margin-bottom:4px}.stat-label{font-size:.875rem;color:var(--text-muted)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin-bottom:32px}.topic-stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:20px}.topic-stat-header{display:flex;align-items:center;gap:12px;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border)}.topic-stat-header .topic-icon{font-size:1.5rem}.topic-stat-header .topic-name{font-weight:600}.topic-stat-details{margin-bottom:16px}.stat-row{display:flex;justify-content:space-between;padding:8px 0;font-size:.9rem;color:var(--text-muted)}.stat-row.highlight{font-weight:600;color:var(--text)}.stats-actions{text-align:center;margin-top:32px}.stats-login{text-align:center;padding:48px 24px}.stats-login 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