:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;min-width:320px;min-height:100vh;display:block}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}#root{width:100%;min-height:100vh}.header{position:fixed;top:0;left:0;right:0;z-index:1000;background-color:#fff;box-shadow:var(--shadow-md);height:70px}.header-container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg);height:100%;display:flex;align-items:center;justify-content:space-between}.logo{display:flex;align-items:center;gap:var(--spacing-md);text-decoration:none;color:var(--color-primary);font-weight:700;font-size:1.25rem;transition:transform var(--transition-base)}.logo:hover{transform:scale(1.05)}.logo-icon{font-size:2rem;line-height:1}.logo-text{display:none}.nav{display:flex;align-items:center;gap:var(--spacing-sm)}.nav-link{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);text-decoration:none;color:var(--color-text-secondary);font-weight:500;transition:all var(--transition-base);position:relative}.nav-link span{display:none}.nav-link:hover{background-color:var(--color-background);color:var(--color-primary)}.nav-link:after{content:"";position:absolute;bottom:0;left:50%;transform:translate(-50%);width:0;height:2px;background-color:var(--color-primary);transition:width var(--transition-base)}.nav-link:hover:after{width:80%}.lang-toggle{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-sm) var(--spacing-md);border:2px solid var(--color-primary);border-radius:var(--radius-md);background-color:#fff;color:var(--color-primary);font-weight:600;cursor:pointer;transition:all var(--transition-base)}.lang-toggle:hover{background-color:var(--color-primary);color:#fff}@media(min-width:640px){.logo-text,.nav-link span{display:block}.nav{gap:var(--spacing-md)}}@media(max-width:768px){.header{height:60px}.header-container{padding:0 var(--spacing-md)}.logo{font-size:1rem}.logo-icon{font-size:1.5rem}.nav-link,.lang-toggle{padding:var(--spacing-sm)}}.home{max-width:1200px;margin:0 auto;padding:var(--spacing-2xl) var(--spacing-lg);min-height:calc(100vh - 70px)}.hero{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-2xl);align-items:center;margin-bottom:var(--spacing-2xl)}.hero-content{animation:fadeInUp .6s ease}.hero-cta{display:flex;justify-content:center}.hero-title{font-size:3rem;font-weight:800;line-height:1.2;margin-bottom:var(--spacing-md);background:linear-gradient(135deg,var(--color-blue),var(--color-red));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.5rem;color:var(--color-text-secondary);margin-bottom:var(--spacing-lg)}.hero-description{font-size:1.125rem;color:var(--color-text-secondary);margin-bottom:var(--spacing-xl)}.hero-info{background:#0055a414;border-left:4px solid var(--color-blue);border-radius:var(--radius-md);padding:var(--spacing-md) var(--spacing-lg);margin-bottom:var(--spacing-lg)}.hero-info-title{font-size:1rem;margin-bottom:var(--spacing-xs);color:var(--color-text-primary)}.hero-info-text{color:var(--color-text-secondary);margin:0}.hero-image{display:flex;justify-content:center;align-items:center}.flag-container{perspective:1000px}.flag{width:300px;height:200px;display:flex;box-shadow:var(--shadow-xl);border-radius:var(--radius-lg);overflow:hidden;animation:float 3s ease-in-out infinite}.flag>div{flex:1}.flag-blue{background-color:#0055a4}.flag-white{background-color:#fff}.flag-red{background-color:#ef4135}.features{margin-top:var(--spacing-2xl)}.features-title{font-size:2rem;text-align:center;margin-bottom:var(--spacing-xl);color:var(--color-primary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-xl)}.feature-card{background:#fff;padding:var(--spacing-xl);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);transition:all var(--transition-base);text-align:center}.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-xl)}.feature-icon{display:inline-flex;padding:var(--spacing-lg);background:linear-gradient(135deg,var(--color-blue),var(--color-red));color:#fff;border-radius:50%;margin-bottom:var(--spacing-lg)}.feature-title{font-size:1.25rem;margin-bottom:var(--spacing-md);color:var(--color-text-primary)}.feature-description{color:var(--color-text-secondary)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes float{0%,to{transform:translateY(0) rotateY(0)}50%{transform:translateY(-20px) rotateY(5deg)}}@media(max-width:768px){.hero{grid-template-columns:1fr;gap:var(--spacing-xl)}.hero-title{font-size:2rem}.hero-subtitle{font-size:1.25rem}.hero-description{font-size:1rem}.flag{width:200px;height:133px}.features-grid{grid-template-columns:1fr}}.achievement-notification{position:fixed;top:100px;right:20px;max-width:400px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1.5rem;border-radius:12px;box-shadow:0 8px 24px #0000004d;z-index:1000;transform:translate(450px);opacity:0;transition:all .3s ease-out}.achievement-notification.visible{transform:translate(0);opacity:1}.notification-close{position:absolute;top:10px;right:10px;background:#fff3;border:none;color:#fff;width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background-color .2s}.notification-close:hover{background:#ffffff4d}.notification-header{display:flex;align-items:center;gap:.5rem;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:1px solid rgba(255,255,255,.3)}.notification-trophy{color:gold;animation:bounce .5s ease infinite alternate}@keyframes bounce{0%{transform:translateY(0)}to{transform:translateY(-5px)}}.notification-header h3{margin:0;font-size:1.1rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px}.notification-content{display:flex;gap:1rem;align-items:center}.notification-icon{width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px #0003;animation:scaleIn .5s ease}@keyframes scaleIn{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}.notification-emoji{font-size:2rem;animation:rotate .6s ease}@keyframes rotate{0%{transform:rotate(-180deg)}to{transform:rotate(0)}}.notification-details{flex:1}.notification-title{margin:0 0 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auto}.quiz-progress{margin-bottom:var(--spacing-xl)}.progress-bar{height:12px;background-color:var(--color-border);border-radius:var(--radius-xl);overflow:hidden;margin-bottom:var(--spacing-sm)}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-blue),var(--color-red));transition:width .5s ease}.progress-text{text-align:center;color:var(--color-text-secondary);font-weight:600}.quiz-score{text-align:center;font-size:1.25rem;font-weight:700;color:var(--color-primary);margin-bottom:var(--spacing-lg)}.question-card{background:#fff;padding:var(--spacing-2xl);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);animation:fadeIn .4s ease}.question-category{display:inline-block;padding:var(--spacing-sm) var(--spacing-md);background:linear-gradient(135deg,var(--color-blue),var(--color-red));color:#fff;border-radius:var(--radius-md);font-size:.875rem;font-weight:600;margin-bottom:var(--spacing-lg)}.question-text{font-size:1.5rem;color:var(--color-text-primary);margin-bottom:var(--spacing-xl);line-height:1.4}.options{display:flex;flex-direction:column;gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}.option{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);background:var(--color-background);border:2px solid var(--color-border);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-base);text-align:left;font-size:1rem;color:var(--color-text-primary)}.option:hover:not(:disabled){background-color:#fff;border-color:var(--color-primary);box-shadow:var(--shadow-md);transform:translate(4px)}.option.selected{border-color:var(--color-primary);background-color:#fff;color:var(--color-text-primary)}.option.correct{border-color:var(--color-success);background-color:#f0fdf4;color:var(--color-text-primary)}.option.incorrect{border-color:var(--color-error);background-color:#fef2f2;color:var(--color-text-primary)}.option:disabled{cursor:not-allowed}.option-text{flex:1;font-weight:500}.option-icon{flex-shrink:0}.option.correct .option-icon{color:var(--color-success)}.option.incorrect .option-icon{color:var(--color-error)}.explanation{padding:var(--spacing-lg);border-radius:var(--radius-lg);animation:slideDown .3s ease}.explanation.correct-answer{background-color:#f0fdf4;border:2px solid var(--color-success)}.explanation.wrong-answer{background-color:#fef2f2;border:2px solid var(--color-error)}.explanation h3{font-size:1.125rem;margin-bottom:var(--spacing-md)}.explanation.correct-answer h3{color:var(--color-success)}.explanation.wrong-answer h3{color:var(--color-error)}.explanation p{margin-bottom:var(--spacing-lg);color:var(--color-text-primary)}.btn-next{width:100%}.quiz-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:calc(100vh - 70px);gap:var(--spacing-lg)}@keyframes fadeIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:768px){.question-card{padding:var(--spacing-lg)}.question-text{font-size:1.25rem}.option{padding:var(--spacing-md)}}.results{min-height:calc(100vh - 70px);display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl) var(--spacing-lg)}.results-container{max-width:600px;width:100%;margin:0 auto;background:#fff;padding:var(--spacing-2xl);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);animation:popIn .5s cubic-bezier(.68,-.55,.265,1.55)}.results-header{text-align:center;margin-bottom:var(--spacing-2xl)}.results-header svg{animation:bounce 1s ease-in-out}.results-title{font-size:2rem;margin:var(--spacing-lg) 0;color:var(--color-primary)}.grade{display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);font-size:1.5rem;font-weight:700;margin-top:var(--spacing-md)}.grade-emoji{font-size:2.5rem;animation:rotate 2s ease-in-out}.results-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-md);margin-bottom:var(--spacing-2xl)}.stat-card{background:var(--color-background);padding:var(--spacing-lg);border-radius:var(--radius-lg);text-align:center;transition:all 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rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media(max-width:768px){.results-container{padding:var(--spacing-lg)}.results-title{font-size:1.5rem}.results-stats{grid-template-columns:1fr}.stat-value{font-size:2rem}}.leaderboard{max-width:1000px;margin:0 auto;padding:var(--spacing-2xl) var(--spacing-lg);min-height:calc(100vh - 70px)}.leaderboard-container{background:#fff;padding:var(--spacing-2xl);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);margin:0 auto}.leaderboard-header{text-align:center;margin-bottom:var(--spacing-2xl)}.leaderboard-header svg{animation:glow 2s ease-in-out infinite}.leaderboard-header h1{font-size:2.5rem;color:var(--color-primary);margin-top:var(--spacing-md)}.no-scores{text-align:center;padding:var(--spacing-2xl);color:var(--color-text-secondary)}.no-scores p{font-size:1.125rem;margin-bottom:var(--spacing-md)}.scores-table{width:100%}.table-header{display:grid;grid-template-columns:80px 1fr 150px 120px;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-background);border-radius:var(--radius-md);font-weight:700;color:var(--color-text-secondary);text-transform:uppercase;font-size:.875rem;letter-spacing:.05em;margin-bottom:var(--spacing-md)}.score-row{display:grid;grid-template-columns:80px 1fr 150px 120px;gap:var(--spacing-md);align-items:center;padding:var(--spacing-lg) var(--spacing-md);border-bottom:1px solid var(--color-border);transition:all var(--transition-base)}.score-row:hover{background:var(--color-background);transform:translate(4px)}.score-row.top-three{background:linear-gradient(90deg,rgba(0,85,164,.05),transparent);font-weight:600}.td-rank{display:flex;align-items:center;justify-content:center}.rank-number{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:var(--color-background);border-radius:50%;font-weight:700;color:var(--color-text-secondary)}.td-username{font-weight:600;color:var(--color-text-primary)}.td-score{text-align:center;color:var(--color-text-secondary)}.td-percentage{display:flex;justify-content:center}.percentage-badge{padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);color:#fff;font-weight:700;font-size:.875rem}.leaderboard-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:calc(100vh - 70px);gap:var(--spacing-lg)}@keyframes glow{0%,to{filter:drop-shadow(0 0 8px 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checkmark{0%{opacity:0;transform:scale(0)}to{opacity:1;transform:scale(1)}}@media(max-width:768px){.settings-container{padding:var(--spacing-lg)}.settings-header h1{font-size:1.5rem}}.progress{min-height:100vh;padding:2rem 1rem;background:linear-gradient(135deg,#667eea,#764ba2)}.progress-container{max-width:1200px;margin:0 auto}.progress-header{text-align:center;color:#fff;margin-bottom:3rem;display:flex;flex-direction:column;align-items:center;gap:1rem}.progress-header h1{font-size:2.5rem;font-weight:700;margin:0}.progress-loading{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:1rem;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2)}.no-progress{background:#fff;border-radius:20px;padding:4rem 2rem;text-align:center;box-shadow:0 10px 40px #0000001a}.no-progress h2{margin:1rem 0;color:#333}.no-progress p{color:#666;max-width:400px;margin:0 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2rem;color:#333;font-size:1.5rem}.chart-container{display:flex;align-items:flex-end;justify-content:space-around;gap:.5rem;height:300px;padding:1rem;background:#f8f9fa;border-radius:12px;overflow-x:auto}.chart-bar-wrapper{display:flex;flex-direction:column;align-items:center;min-width:60px;height:100%;justify-content:flex-end}.chart-bar{width:40px;min-height:20px;border-radius:8px 8px 0 0;position:relative;display:flex;align-items:flex-start;justify-content:center;padding-top:.5rem;transition:all .3s ease}.chart-bar:hover{opacity:.8;transform:scaleY(1.02)}.bar-label{color:#fff;font-weight:700;font-size:.875rem;text-shadow:0 1px 2px rgba(0,0,0,.2)}.bar-index{margin-top:.5rem;font-size:.75rem;color:#666;font-weight:600}.attempts-history{background:#fff;border-radius:20px;padding:2rem;box-shadow:0 4px 20px #0000001a}.attempts-history h2{margin:0 0 1.5rem;color:#333;font-size:1.5rem}.attempts-table{width:100%}.table-header{display:grid;grid-template-columns:80px 1fr 120px 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