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.2s}.module-title:hover{background-color:#0000000d}.module-title.active{color:var(--primary);background-color:#4f46e51a}.topic-list{list-style:none;margin:0;padding:8px 0 8px 24px;background-color:#00000005}.topic-item{padding:10px 24px 10px 16px;font-size:.9rem;color:var(--text-muted);cursor:pointer;transition:all .2s;border-left:2px solid transparent;display:flex;justify-content:space-between;align-items:center}.topic-item:hover{color:var(--text);border-left-color:#0003;background-color:#00000008}.topic-item.active{color:var(--primary);border-left-color:var(--primary);background-color:#4f46e50d;font-weight:500}.topic-title{flex:1;padding-right:12px}.practice-badge{font-size:.65rem;padding:2px 6px;border-radius:4px;background-color:var(--surface);color:var(--text-muted);border:1px solid var(--border);font-weight:600;text-transform:uppercase;letter-spacing:.05em}.badge-theory{background-color:#3b82f626;color:#60a5fa;border-color:#3b82f64d}.badge-quiz{background-color:#8b5cf626;color:#a78bfa;border-color:#8b5cf64d}.badge-practice{background-color:#f59e0b26;color:#fbbf24;border-color:#f59e0b4d}.sidebar-footer{padding:16px 24px;border-top:1px solid var(--border)}.back-btn{width:100%;padding:10px;background-color:transparent;border:1px solid var(--border);color:var(--text);border-radius:6px;cursor:pointer;font-size:.9rem;transition:all .2s}.back-btn:hover{background-color:#0000000d;border-color:#0003}.course-content-area{flex:1;overflow:hidden;position:relative;background-color:var(--surface)}@media (max-width: 768px){.sidebar-header p{display:none}.course-view-container{flex-direction:column}.mobile-course-header{display:block}.course-sidebar{width:100%;max-height:0;overflow:hidden;border-right:none;border-bottom:1px solid var(--border);transition:max-height .3s ease-in-out}.course-sidebar.open{max-height:85vh;overflow-y:auto}}#root{width:100%;margin:0;padding:0;height:100vh;display:flex;flex-direction:column}.app{display:flex;flex-direction:column;height:100%}.app-header{margin-bottom:2rem;text-align:center}.app-header h1{font-size:2.5rem;font-weight:700;background:-webkit-linear-gradient(45deg,#4f46e5,#ec4899);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.app-main{flex:1;display:flex;flex-direction:column;align-items:stretch;overflow:hidden}.generating-view{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;gap:16px}.spinner{width:50px;height:50px;border:5px solid rgba(0,0,0,.1);border-left-color:#4f46e5;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.mobile-app-header{display:none;align-items:center;padding:1rem;background:var(--surface-color);border-bottom:1px solid var(--border-color)}.hamburger-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;margin-right:1rem;color:var(--text-color)}.mobile-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;z-index:999}@media (max-width: 768px){.mobile-app-header{display:flex}}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light;color:#1e293b;background-color:#f8fafc;--surface: #ffffff;--background: #f1f5f9;--border: #e2e8f0;--primary: #4f46e5;--text: #1e293b;--text-muted: #64748b;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;flex-direction:column;min-width:320px;min-height:100vh;background-color:var(--background)}#root{margin:0 auto;padding:0;width:100%;height:100vh;display:flex;flex-direction:column}*{box-sizing:border-box}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}