:root{color-scheme:light;font-family:Manrope,sans-serif;line-height:1.5;font-weight:500;background:radial-gradient(circle at top left,rgba(143,106,255,.14),transparent 28%),radial-gradient(circle at top right,rgba(110,85,255,.1),transparent 30%),linear-gradient(180deg,#faf8ff,#f6f4ff 48%,#fff);color:#241b43;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--bg-card: #ffffff;--bg-card-strong: #ffffff;--border: rgba(0, 0, 0, .18);--border-strong: rgba(0, 0, 0, .24);--accent: #8f6aff;--accent-2: #b8a4ff;--text-soft: #7d729f;--shadow: none}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{min-width:320px}*{scrollbar-width:none}*::-webkit-scrollbar{width:0;height:0}a{color:inherit;text-decoration:none}button{font:inherit}.app-shell{position:relative;min-height:100vh;padding:40px 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minmax(0,1fr);gap:18px;align-items:stretch;background:none;border:0;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none}.app-shell.viewport-locked .course-layout{flex:1;min-height:0;overflow:hidden}.course-sidebar-column,.course-sidebar,.course-content{border:1px solid var(--border);border-radius:28px;background:var(--bg-card)}.course-sidebar-column{display:flex;flex-direction:column;gap:10px;padding:18px;min-height:0;background:#fff}.course-sidebar-overlay,.sidebar-toggle-button,.sidebar-close-button,.sidebar-icon-button:not(.office-hours-mobile-modal-close){display:none}.sidebar-actions{flex-shrink:0;position:relative}.course-back-button{width:100%}.course-sidebar{padding:0;max-height:none;overflow:auto;border:0;border-radius:0;background:transparent;box-shadow:none;flex:1;min-height:0}.sidebar-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.topic-list{display:flex;flex-direction:column;gap:12px}.topic-block{border:1px solid 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.player-stage{flex:1;min-height:0}.lesson-video,.ide-frame{width:100%;border:0}.lesson-video{display:block;height:100%;min-height:min(58vh,620px);background:#000}.lesson-video.loading{opacity:0}.video-placeholder{min-height:min(58vh,620px);padding:32px;display:flex;flex-direction:column;justify-content:center;gap:10px;color:var(--text-soft)}.video-placeholder.loading{align-items:center;text-align:center;justify-content:center;gap:18px}.video-placeholder strong{color:#382565;font-size:1.2rem}.tasks-panel{display:flex;flex-direction:column;gap:16px}.app-shell.viewport-locked .tasks-panel{overflow:auto}.task-tabs{display:flex;flex-wrap:wrap;gap:10px}.task-tab{padding:12px 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