@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700&display=swap";
:root{--primary:#3b82f6;--primary-hover:#2563eb;--primary-light:#eff6ff;--success:#10b981;--success-light:#ecfdf5;--warning:#f59e0b;--warning-light:#fffbeb;--danger:#ef4444;--danger-light:#fef2f2;--bg-color:#f8fafc;--card-bg:#fff;--text-main:#0f172a;--text-muted:#64748b;--border-color:#e2e8f0;--border-radius:12px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a}@media (prefers-color-scheme:dark){:root{--bg-color:#0f172a;--card-bg:#1e293b;--text-main:#f8fafc;--text-muted:#94a3b8;--border-color:#334155;--primary-light:#1e3a8a}}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-main);-webkit-font-smoothing:antialiased;font-family:Inter,sans-serif;line-height:1.6}h1,h2,h3,h4,h5,h6{font-family:Outfit,sans-serif;font-weight:600;line-height:1.2}a{color:inherit;text-decoration:none}.container{max-width:1200px;margin:0 auto;padding:0 20px}.header{background:var(--card-bg);border-bottom:1px solid var(--border-color);z-index:100;box-shadow:var(--shadow-sm);padding:1rem 0;position:sticky;top:0}.header-content{justify-content:space-between;align-items:center;display:flex}.logo{color:var(--primary);align-items:center;gap:8px;font-family:Outfit,sans-serif;font-size:1.5rem;font-weight:700;display:flex}.main{min-height:calc(100vh - 140px);padding:2rem 0}.card{background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--border-radius);box-shadow:var(--shadow-sm);padding:1.5rem;transition:transform .2s,box-shadow .2s}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.question-item{margin-bottom:1.5rem}.question-header{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.badge{border-radius:999px;padding:.25rem .75rem;font-size:.875rem;font-weight:500;display:inline-block}.badge-primary{background:var(--primary-light);color:var(--primary)}.badge-success{background:var(--success-light);color:var(--success)}.badge-warning{background:var(--warning-light);color:var(--warning)}.badge-danger{background:var(--danger-light);color:var(--danger)}.options-list{flex-direction:column;gap:.75rem;margin-top:1rem;display:flex}.option-item{border:1px solid var(--border-color);cursor:pointer;border-radius:8px;align-items:center;gap:1rem;padding:.75rem 1rem;transition:all .2s;display:flex}.option-item:hover{background:var(--primary-light);border-color:var(--primary)}.option-label{background:var(--bg-color);border:1px solid var(--border-color);border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-weight:600;display:flex}.katex-display{margin:1em 0;overflow:auto hidden}.btn{cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;padding:.5rem 1rem;font-family:inherit;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.math-image{border:1px solid var(--border-color);border-radius:8px;max-width:100%;height:auto;margin-top:.5rem}.quiz-math-img{object-fit:contain;border:1px solid var(--border-color);border-radius:8px;width:auto;max-width:500px;height:auto;max-height:350px;margin:10px auto;display:block}.katex{font-size:1.1em}.katex-display{margin:1.2em 0;padding:.5rem 0;overflow:auto hidden}.katex-display>.katex{text-align:center;margin:0 auto;display:inline-block}.katex-inline{white-space:nowrap;display:inline}.katex-display::-webkit-scrollbar{height:6px}.katex-display::-webkit-scrollbar-track{background:var(--bg-color);border-radius:3px}.katex-display::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.katex-display::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.katex .mord,.katex .mbin,.katex .mrel,.katex .mop{color:var(--text-main)}