: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;display:flex;justify-content:flex-start;align-items:flex-start;min-width:320px;min-height:100vh;padding:20px}h1{font-size:1.6em;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}}.app{width:800px;max-width:100%;margin:0;padding:20px;font-family:Arial,sans-serif;display:flex;flex-direction:column;box-sizing:border-box}header h2{color:#555;font-size:22px;margin:10px 0 0;font-weight:400}.quiz-header{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;margin-top:10px;width:100%}.quiz-header h2{margin:0}.quiz-info{display:flex;align-items:center;justify-content:flex-start;flex-wrap:wrap;gap:15px;width:100%}.quiz-time{display:flex;align-items:center;gap:5px;color:#555;font-size:14px;background-color:#f0f0f0;border-radius:20px;padding:5px 10px;margin-left:20px}.time-icon{margin-right:2px}main{flex:1;display:flex;align-items:center;justify-content:center}footer{margin-top:30px;text-align:center;display:flex;flex-direction:column;gap:15px}.progress{background-color:#f8f9fa;padding:10px;border-radius:5px;font-size:16px;color:#555}.footer-actions{display:flex;justify-content:center;margin-top:10px}@media (max-width: 840px){.app{width:100%;padding:15px}}.back-button,.choose-new-button{display:inline-block;margin:5px auto;padding:10px 15px;background-color:#3a86ff;color:#fff;border:none;border-radius:4px;font-size:16px;cursor:pointer}.choose-new-button{background-color:#6c757d;margin:0;font-size:14px;padding:8px 12px}.back-button:hover,.choose-new-button:hover{opacity:.9}@media (max-width: 600px){.app{padding:15px}header h2{font-size:18px}}.logo.react:hover{filter:drop-shadow(0 0 2em #61dafbaa)}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (prefers-reduced-motion: no-preference){a:nth-of-type(2) .logo{animation:logo-spin infinite 20s linear}}.card{padding:2em}.read-the-docs{color:#888}@media (max-width: 600px){.app{padding:15px}.quiz-header{gap:8px}.quiz-header h2{font-size:20px}.quiz-info{gap:10px}.choose-new-button{font-size:14px;padding:8px 12px}}.github-link{margin-top:30px;text-align:center;font-size:14px;padding:10px;border-top:1px solid #eee}.github-link a{color:#3a86ff;text-decoration:none;transition:color .2s}.github-link a:hover{color:#2563eb;text-decoration:underline}@media (max-width: 600px){.github-link{font-size:13px;margin-top:20px;padding:8px}}.quiz-question{padding:20px;background-color:#fff;border-radius:10px;box-shadow:0 4px 10px #0000001a;width:100%;margin:0 auto;position:relative;color:#222;box-sizing:border-box}.streak-counter{position:absolute;top:-15px;right:20px;background-color:#f8f9fa;border:1px solid #ddd;border-radius:20px;padding:5px 12px;font-size:14px;display:flex;align-items:center;box-shadow:0 2px 5px #0000001a}.streak-text{color:#666;margin-right:5px}.streak-count{font-weight:700;color:#3a86ff;font-size:16px}.streak-fire{font-size:18px;margin-left:5px;animation:fire-pulse .8s infinite alternate}@keyframes fire-pulse{0%{transform:scale(1)}to{transform:scale(1.2)}}.quiz-question h2{margin-bottom:20px;color:#333;text-align:left}.options{display:flex;flex-direction:column;gap:10px}.option{padding:15px 20px;color:#333;background-color:#f8f9fa;border:1px solid #ddd;border-radius:5px;font-size:16px;cursor:pointer;transition:all .2s;text-align:left}.option:disabled{opacity:1;cursor:default;color:inherit;background-color:#f8f9fa;pointer-events:none;color:#000}.option:hover:not(:disabled){background-color:#e9ecef}.option.selected{font-weight:700}.option.correct,.option.correct:disabled{background-color:#d4edda;border-color:#c3e6cb;color:#155724}.option.incorrect,.option.incorrect:disabled{background-color:#f8d7da;border-color:#f5c6cb;color:#721c24}.option.show-correct,.option.show-correct:disabled{border:2px solid #28a745;box-shadow:0 0 0 2px #28a74540;position:relative}.correct-answer-indicator{font-size:14px;margin-left:10px;color:#28a745;font-weight:700}.explanation-container{margin-top:20px;padding:15px;background-color:#e9f7fd;border-left:4px solid #3a86ff;border-radius:4px;animation:fadeIn .5s}.explanation-container h3{margin-top:0;color:#3a86ff;font-size:1rem;margin-bottom:8px}.explanation-container p{margin:0;line-height:1.5;color:#444}.continue-button-container{margin-top:20px;display:flex;justify-content:center;animation:fadeIn .5s}.continue-button{padding:10px 25px;background-color:#3a86ff;color:#fff;border:none;border-radius:4px;font-size:16px;font-weight:600;cursor:pointer;transition:background-color .2s;box-shadow:0 2px 4px #0000001a}.continue-button:hover{background-color:#2563eb}.continue-button:active{transform:translateY(1px)}@keyframes fadeIn{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 600px){.quiz-question{padding:15px;border-radius:8px}.quiz-question h2{font-size:18px}.streak-counter{top:-25px}.option{padding:12px 15px;font-size:15px}.explanation-container{padding:12px}.continue-button{padding:8px 20px;font-size:15px}}.quiz-code{background-color:#f5f5f5;border:1px solid #ddd;border-radius:4px;font-family:Courier New,Courier,monospace;padding:1em;margin:1em 0;overflow-x:auto;white-space:pre;font-size:.9em;line-height:1.4}.quiz-code-dark{background-color:#1e1e1e;color:#fff;border:1px solid #333;border-radius:4px;font-family:Courier New,Courier,monospace;padding:1em;margin:1em 0;overflow-x:auto;white-space:pre;font-size:.9em;line-height:1.4}code{background-color:#f5f5f5;border-radius:3px;font-family:Courier New,Courier,monospace;padding:.2em .4em;margin:0 .2em;font-size:.9em}.quiz-inline-code{background-color:#1e1e1e;color:#fff;border-radius:3px;font-family:Courier New,Courier,monospace;padding:.2em .4em;margin:0;font-size:.9em;display:inline-block}h2 .quiz-inline-code{background-color:#e0e0e0;color:#000;border:1px solid #cccccc}pre code.quiz-code-block{background-color:#1e1e1e;color:#fff;display:block;padding:.5em;border-radius:4px;font-family:Courier New,Courier,monospace;font-size:.9em;white-space:pre;overflow-x:auto;line-height:1.4}.option pre{margin:.5em 0;background-color:#1e1e1e;border-radius:4px;padding:0;overflow:hidden}.option .quiz-inline-code{margin:.2em 0}.keyword{color:#00f;font-weight:700}.string{color:#a31515}.comment{color:green;font-style:italic}.function{color:#795e26}.variable{color:#1a1a1a}.operator{color:#000}.quiz-code-dark .keyword{color:#569cd6;font-weight:700}.quiz-code-dark .string{color:#ce9178}.quiz-code-dark .comment{color:#6a9955;font-style:italic}.quiz-code-dark .function{color:#dcdcaa}.quiz-code-dark .variable{color:#9cdcfe}.quiz-code-dark .operator{color:#d4d4d4}.quiz-code-dark .number{color:#b5cea8}.quiz-code-dark .jsx-tag{color:gray}.quiz-code-dark .jsx-attribute{color:#9cdcfe}.quiz-code-dark .jsx-expression{color:#569cd6}.question-example{margin:1rem 0 2rem;padding:.5rem;border-radius:8px;background-color:#f8f9fa;border-left:4px solid #5c7cfa}.explanation-example{margin:1.5rem 0 .5rem;padding:1rem;border-radius:8px;background-color:#f8f9fa;border-left:4px solid #37b24d}.question-example:before{content:"Example:";display:block;font-weight:700;margin-bottom:.5rem;color:#5c7cfa}.explanation-example:before{content:"Solution Example:";display:block;font-weight:700;margin-bottom:.5rem;color:#37b24d}.question-example .quiz-code-dark,.explanation-example .quiz-code-dark{margin:.5rem 0}.quiz-result{padding:30px;background-color:#fff;border-radius:10px;box-shadow:0 4px 15px #0000001a;width:100%;margin:0 auto;text-align:center;box-sizing:border-box}.quiz-result h2{margin-bottom:20px;color:#333}.score-container{margin:30px 0}.score{font-size:48px;font-weight:700;color:#3a86ff}.percentage{font-size:24px;color:#555;margin-top:5px}.feedback{margin:20px 0;padding:15px;background-color:#f8f9fa;border-radius:5px;font-size:18px}.share-container{margin:25px 0 15px;text-align:center}.share-container h3{margin-bottom:12px;font-size:18px;color:#555}.share-buttons{display:flex;justify-content:center;margin-top:10px}.copy-button{background-color:#3a86ff;color:#fff;padding:10px 20px;border-radius:8px;border:none;display:flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;transition:background-color .2s,transform .2s;box-shadow:0 2px 5px #0003;font-size:16px;font-weight:600;position:relative}.copy-button:hover{background-color:#2563eb;transform:translateY(-2px)}.copy-button:active{transform:translateY(0)}.copy-icon{font-size:20px}.copy-text{margin-left:2px}.copied-tooltip{position:absolute;bottom:-30px;left:50%;transform:translate(-50%);background-color:#000000b3;color:#fff;padding:4px 10px;border-radius:4px;font-size:14px;font-weight:400;white-space:nowrap;animation:fadeInOut 2s;z-index:10}@keyframes fadeInOut{0%{opacity:0}20%{opacity:1}80%{opacity:1}to{opacity:0}}.result-buttons{display:flex;justify-content:center;gap:15px;margin-top:25px}.restart-button{background-color:#3a86ff;color:#fff;padding:12px 25px;border:none;border-radius:5px;font-size:16px;cursor:pointer;transition:background-color .2s}.restart-button:hover{background-color:#2b6bde}.new-quiz-button{background-color:#6c757d;color:#fff;padding:12px 25px;border:none;border-radius:5px;font-size:16px;cursor:pointer;transition:background-color .2s}.new-quiz-button:hover{background-color:#5a6268}@media (max-width: 600px){.quiz-result{padding:20px;border-radius:8px}.quiz-result h2{font-size:22px}.score-container{font-size:18px}.share-container h3{font-size:16px}.copy-button{padding:8px 16px;font-size:15px}.copy-icon{font-size:18px}.action-buttons{flex-direction:column;gap:10px}.restart-button,.new-quiz-button{width:100%;padding:10px;font-size:15px}.result-buttons{flex-direction:column;width:100%}.restart-button,.new-quiz-button{width:100%}}.quiz-stats{margin:25px 0;padding:15px;background-color:#f8f9fa;border-radius:8px;text-align:center}.quiz-stats h3{margin-bottom:15px;color:#333;font-size:18px}.stats-grid{display:flex;justify-content:space-around;margin-bottom:20px}.stat-item{padding:10px;width:33%}.stat-value{font-size:24px;font-weight:700;color:#3a86ff}.stat-label{font-size:14px;color:#666;margin-top:5px}.score-distribution{margin-top:15px}.score-distribution h4{margin-bottom:10px;font-size:16px;color:#444}.distribution-bar{height:20px;display:flex;width:100%;margin:0 auto;border-radius:10px;overflow:hidden}.distribution-segment{height:100%;transition:width .5s ease}.distribution-labels{display:flex;justify-content:space-between;margin-top:5px;font-size:12px;color:#777}.quiz-selector{width:100%;max-width:800px;margin:0 auto}.quiz-selector h2{text-align:center;margin-bottom:30px;color:#3a86ff}.quiz-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}.quiz-card{background-color:#fff;border-radius:8px;padding:20px;box-shadow:0 4px 10px #0000001a;cursor:pointer;transition:transform .2s,box-shadow .2s}.quiz-card:hover{transform:translateY(-5px);box-shadow:0 6px 15px #00000026}.quiz-card h3{margin-top:0;color:#333}.quiz-card p{color:#666;margin-bottom:20px}.quiz-info{display:flex;justify-content:space-between;align-items:center;color:#777;font-size:14px;margin-top:10px;flex-wrap:wrap;gap:8px}.quiz-id{background-color:#f0f0f0;padding:2px 8px;border-radius:4px;font-size:12px;color:#666}.quiz-time{display:flex;align-items:center;background-color:#f0f9ff;padding:2px 8px;border-radius:4px;font-size:12px;color:#3a86ff}.no-quizzes{text-align:center;padding:30px;background-color:#f8f9fa;border-radius:5px;color:#666;font-size:18px}.loading{text-align:center;padding:40px;font-size:18px;color:#666}.error{text-align:center;padding:20px;background-color:#f8d7da;color:#721c24;border-radius:5px;margin:20px auto;max-width:600px}.celebration-container{position:fixed;top:0;left:0;width:100%;height:100%;display:flex;justify-content:center;align-items:center;z-index:1000;pointer-events:none}.confetti-container{position:absolute;top:0;left:0;width:100%;height:100%}.confetti{position:absolute;border-radius:50%;animation:confetti-fall linear forwards;opacity:.8}@keyframes confetti-fall{0%{transform:translateY(-10vh) rotate(0);opacity:0}10%{opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}.celebration-message{background-color:#fffffff2;padding:20px 40px;border-radius:15px;box-shadow:0 8px 25px #0003;text-align:center;animation:message-pop .5s ease-out forwards;display:flex;align-items:center;height:300px;z-index:1001;background-size:auto 300px!important;background-repeat:no-repeat!important;background-position:center center!important}@keyframes message-pop{0%{transform:scale(.5);opacity:0}70%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}.celebration-message h3{margin:0 15px;color:#333;font-size:24px}.emoji{font-size:36px;animation:emoji-bounce 1s infinite alternate;display:inline-block}.celebration-container .emoji{transform-origin:center center}.celebration-container .emoji:nth-of-type(1):has(+h3:contains("10 in a row")){font-size:42px;animation:emoji-spin 1.5s infinite alternate}.celebration-container .emoji:nth-of-type(2):has(~h3:contains("10 in a row")){font-size:42px;animation:emoji-spin 1.5s infinite alternate-reverse}.celebration-container .emoji:nth-of-type(1):has(+h3:contains("20 in a row")){font-size:48px;animation:emoji-pulse 1s infinite}.celebration-container .emoji:nth-of-type(2):has(~h3:contains("20 in a row")){font-size:48px;animation:emoji-pulse 1s infinite}@keyframes emoji-spin{0%{transform:rotate(0) translateY(0)}to{transform:rotate(25deg) translateY(-12px)}}@keyframes emoji-pulse{0%{transform:scale(1)}50%{transform:scale(1.3)}to{transform:scale(1)}}@keyframes emoji-bounce{0%{transform:translateY(0)}to{transform:translateY(-10px)}}.modal-overlay{position:fixed;inset:0;background-color:#0009;z-index:1000;display:flex;align-items:center;justify-content:center;animation:fadeIn .3s ease}.modal-content{background-color:#fff;border-radius:8px;max-width:450px;width:90%;padding:25px;box-shadow:0 5px 15px #0003;animation:slideIn .3s ease}.modal-title{color:#3a86ff;margin-top:0;margin-bottom:15px;font-size:1.5rem}.modal-message{margin-bottom:20px;line-height:1.5;color:#333;font-size:1rem}.modal-actions{display:flex;justify-content:flex-end;gap:10px}.modal-button{padding:10px 20px;border-radius:4px;font-weight:700;cursor:pointer;transition:all .2s;border:none;font-size:14px}.modal-cancel{background-color:#f1f1f1;color:#333}.modal-cancel:hover{background-color:#e0e0e0}.modal-confirm{background-color:#3a86ff;color:#fff}.modal-confirm:hover{background-color:#2563eb}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideIn{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}@media (max-width: 600px){.modal-content{padding:20px;width:85%}.modal-title{font-size:1.3rem}.modal-message{font-size:.95rem}.modal-button{padding:8px 16px;font-size:13px}}