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(min-width:900px){.lesson_sidebar__vvQ18{height:75vh;position:sticky;top:24px}}.lesson_sidebarHeader__LJFMq{padding:16px;background:var(--bg-elevated);border-bottom:1px solid var(--border-subtle)}.lesson_sidebarTitle__mk__i{font-size:.9rem;font-weight:700;color:var(--text-primary)}.lesson_sidebarList__JgaXJ{flex:1 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var(--transition-fast)}.lesson_lessonItemActive__bQjpY{background:var(--color-blue-dim);border-color:var(--color-blue);color:var(--color-blue)}.lesson_lessonItemInactive__vGFsF{background:var(--bg-surface);border-color:var(--border-subtle)}.lesson_lessonItemInactive__vGFsF:hover{background:var(--bg-elevated);border-color:var(--border-dim)}.lesson_lessonItemComingSoon__jmfaZ{cursor:not-allowed;opacity:.72}.lesson_lessonItemComingSoon__jmfaZ:hover{background:var(--bg-surface);border-color:var(--border-subtle)}.lesson_comingSoonBadge__r6aHs{flex-shrink:0;border-radius:var(--radius-full);padding:2px 7px;background:var(--surface-alpha-3);color:var(--text-muted);font-size:.62rem;font-weight:700}.lesson_lockStateIcon__FpgQD{flex-shrink:0;color:var(--color-text-disabled)}.lesson_unlockStateIcon__1qDPC{flex-shrink:0;color:var(--color-success);transition:transform var(--transition-base),filter var(--transition-base)}.lesson_unlockStateIconGlow__n99Bc{animation:lesson_unlockGlow__F_M17 1.2s 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var(--border-dim);border-radius:var(--radius-md);color:var(--text-primary);font-size:15px;font-weight:700;cursor:pointer;box-shadow:var(--shadow-card);transition:transform .15s ease,box-shadow .15s ease,background .15s ease,border-color .15s ease}.login_googleBtn__REJVG:hover{transform:translateY(-1px);box-shadow:var(--shadow-md);background:var(--bg-elevated);border-color:var(--color-primary)}.login_googleBtn__REJVG:active{transform:translateY(0)}.login_googleBtn__REJVG:disabled{opacity:.7;cursor:not-allowed}.login_googleIcon__s_5Kf{flex-shrink:0}.login_footerNote__VH9mY{font-size:11px;color:var(--text-muted);line-height:1.5;margin-top:24px}.login_spinner__01OFs{width:18px;height:18px;border:2px solid var(--text-primary);border-top:2px solid transparent;border-radius:50%;animation:login_spin__7YwG_ .8s linear infinite}@keyframes 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var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden}.VideoPlayer_embedContainer__jXcdO{position:relative;width:100%;aspect-ratio:16/9;background:#000}.VideoPlayer_iframe__JR1Oi{position:absolute;inset:0;width:100%;height:100%;border:none}.VideoPlayer_noEmbed__cgYff{aspect-ratio:16/9;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:var(--bg-elevated);color:var(--text-secondary);font-size:.9rem;text-align:center;padding:24px}.VideoPlayer_noEmbedIcon__QfBaY{font-size:3rem;opacity:.4}.VideoPlayer_noEmbedSub__EEDPY{font-size:.78rem;color:var(--text-muted)}.VideoPlayer_controls__ktcoL{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:12px 16px;border-top:1px solid 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var(--color-orange-dim);background:var(--color-orange-dim);color:var(--color-orange);cursor:pointer;transition:all var(--transition-fast)}.VideoPlayer_tgBtn__aGDWs:hover:not(:disabled){background:rgba(255,122,53,.25);border-color:var(--color-orange)}.VideoPlayer_tgBtn__aGDWs:disabled{opacity:.6;cursor:not-allowed}.VideoPlayer_tgSpinner__pQlEG{display:inline-block;width:14px;height:14px;border:2px solid var(--color-orange);border-top:2px solid transparent;border-radius:50%;animation:VideoPlayer_spin__Glh5m .7s linear infinite}@keyframes VideoPlayer_spin__Glh5m{to{transform:rotate(1turn)}}.VideoPlayer_tgError__XbarS{font-size:.7rem;color:var(--color-danger);text-align:right}.SaveCourseButton_saveBtn__tcO5M{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;background:var(--surface-alpha-1);border:1px solid var(--surface-alpha-3);border-radius:var(--radius-full,9999px);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast,.15s);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.SaveCourseButton_saveBtn__tcO5M:hover{background:var(--surface-alpha-3);border-color:var(--color-sky-tint)}.SaveCourseButton_saveBtn__tcO5M:active{transform:scale(.95)}.SaveCourseButton_saveBtn__tcO5M:disabled{opacity:.6;cursor:not-allowed}.SaveCourseButton_saved__PMOMg{background:var(--color-sky-tint)!important;border-color:var(--color-sky-tint)!important;color:var(--color-sky)!important}.SaveCourseButton_iconAnim__mRkIA{transition:transform .2s cubic-bezier(.175,.885,.32,1.275)}.SaveCourseButton_saveBtn__tcO5M:active .SaveCourseButton_iconAnim__mRkIA{transform:scale(.85)}