: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;place-items:center;min-width:320px;min-height:100vh}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}}body{display:flex;justify-content:center;min-height:100vh;background-color:#f0fdf4}#root{width:100%;max-width:600px;margin:0 auto;padding:20px}body{font-family:Helvetica Neue,Arial,Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;background-color:#f5f7fa;color:#333;margin:0;padding:20px;line-height:1.6}.container{max-width:600px;margin:0 auto;background-color:transparent}.home-screen{text-align:left;padding:30px 10px}.home-title{font-size:28px;font-weight:800;margin-bottom:15px;color:#1a202c}.home-subtitle{color:#718096;margin-bottom:40px;line-height:1.8;font-size:1rem}.menu-buttons{display:flex;flex-direction:column;gap:25px}.menu-card{border:none;border-radius:24px;padding:30px;text-align:left;cursor:pointer;display:flex;justify-content:space-between;align-items:center;box-shadow:0 10px 25px -5px #0000001a,0 8px 10px -6px #0000001a;transition:transform .2s,box-shadow .2s;color:#fff;position:relative;overflow:hidden}.menu-card:active{transform:scale(.98)}.card-content h2{font-size:1.5rem;margin:0 0 10px;font-weight:700}.card-content p{margin:0;font-size:.95rem;opacity:.9}.card-icon{font-size:3.5rem;opacity:.8}.primary-card{background:linear-gradient(135deg,#667eea,#764ba2)}.secondary-card{background:linear-gradient(135deg,#2af598,#009efd)}.error{color:#e53e3e;background:#fff5f5;padding:15px;border-radius:8px;margin-top:20px;text-align:center}.category-screen{text-align:center;padding-top:20px}.category-list{display:grid;grid-template-columns:1fr;gap:12px;margin:30px 0}.category-btn{background:#fff;border:1px solid #e2e8f0;padding:15px 20px;border-radius:12px;font-size:1rem;text-align:left;cursor:pointer;color:#2d3748;font-weight:700;box-shadow:0 2px 4px #0000000d}.category-btn:hover{background:#f7fafc;border-color:#cbd5e0}.back-btn{background:transparent;border:none;color:#718096;margin-top:20px;cursor:pointer;font-size:1rem}.quiz-screen .card{background:#fff;padding:30px;border-radius:20px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a}.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.badge{background:#edf2f7;color:#4a5568;padding:6px 16px;border-radius:20px;font-size:.9rem;font-weight:700}.close-btn{background:#e2e8f0;color:#4a5568;border:none;padding:8px 16px;border-radius:8px;cursor:pointer;font-weight:700}.question-text{font-size:1.4rem;margin-bottom:30px;color:#2d3748}.options{display:flex;flex-direction:column;gap:15px}.option-btn{padding:18px;border:2px solid #e2e8f0;background:#fff;border-radius:12px;font-size:1.1rem;cursor:pointer;text-align:left;transition:all .2s;color:#2d3748}.option-btn:hover:not(:disabled){background-color:#f7fafc;border-color:#cbd5e0}.option-btn.correct{background-color:#c6f6d5;border-color:#48bb78;color:#065f46}.option-btn.incorrect{background-color:#fed7d7;border-color:#f56565;color:#9b2c2c}.result-area{margin-top:30px;padding:25px;border-radius:12px;background:#f7fafc}.result-area.correct{background:#f0fff4}.result-area.incorrect{background:#fff5f5}.explanation{margin:20px 0;white-space:pre-wrap;color:#4a5568}.next-btn{width:100%;padding:18px;background-color:#4299e1;color:#fff;border:none;border-radius:12px;font-size:1.2rem;font-weight:700;cursor:pointer;margin-top:20px;box-shadow:0 4px 6px #4299e166}.next-btn:hover{background-color:#3182ce}.error-overlay{position:fixed;bottom:20px;left:50%;transform:translate(-50%);background:#e53e3e;color:#fff;padding:15px 25px;border-radius:50px;box-shadow:0 10px 15px -3px #0000001a;text-align:center;cursor:pointer;z-index:100}