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.course-sidebar__back:hover{color:var(--course-rail-ink)}.course-sidebar__collapse-btn{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:1.5rem;height:1.5rem;border-radius:var(--radius-sm);border:none;background:transparent;color:var(--muted-foreground);cursor:pointer;transition:background-color .12s ease,color .12s ease}.course-sidebar__collapse-btn:hover{background:var(--muted);border-color:transparent;color:var(--foreground)}.course-sidebar__scroll{min-height:0;flex:1;overflow-y:auto;overscroll-behavior:contain;padding:.5rem}.course-sidebar__scroll::-webkit-scrollbar{width:6px}.course-sidebar__scroll::-webkit-scrollbar-thumb{border-radius:999px;background:color-mix(in oklch,var(--muted-foreground) 28%,transparent)}.course-sidebar__back{display:inline-flex;align-items:center;gap:.375rem;font-size:.75rem;font-weight:500;color:var(--muted-foreground);text-decoration:none;transition:color .16s 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ease}.course-sidebar-parts__num{position:relative;z-index:1;font-size:.72rem;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:1}.course-sidebar-parts__dot.is-passed{border-color:color-mix(in oklch,var(--parts-accent) 42%,transparent);background:color-mix(in oklch,var(--parts-accent) 16%,var(--background));color:color-mix(in oklch,var(--parts-accent) 78%,var(--foreground));box-shadow:0 0 0 2.5px color-mix(in oklch,var(--parts-accent) 8%,var(--background))}.course-sidebar-parts__dot:hover{color:var(--foreground);border-color:color-mix(in oklch,var(--parts-accent) 55%,var(--border));background:color-mix(in oklch,var(--parts-accent) 14%,var(--background));transform:scale(1.1);box-shadow:0 0 0 2.5px color-mix(in oklch,var(--parts-accent) 12%,var(--background)),0 2px 6px color-mix(in oklch,var(--parts-accent) 18%,transparent)}.course-sidebar-parts__dot.is-active{width:var(--parts-dot-active);height:var(--parts-dot-active);border-color:transparent;background:linear-gradient(180deg,color-mix(in oklch,var(--parts-accent) 88%,black 6%),color-mix(in oklch,var(--parts-accent) 72%,black 14%));color:color-mix(in oklch,white 92%,var(--parts-accent));transform:scale(1.06);box-shadow:0 0 0 3px color-mix(in oklch,var(--parts-accent) 22%,var(--background)),0 2px 7px color-mix(in oklch,var(--parts-accent) 34%,transparent)}.course-sidebar-parts__dot.is-active .course-sidebar-parts__num{font-size:.78rem}.course-sidebar-parts__dot.is-active:hover{color:#fff;border-color:transparent;background:color-mix(in oklch,var(--parts-accent) 90%,black);transform:scale(1.12);box-shadow:0 0 0 3px color-mix(in oklch,var(--parts-accent) 28%,var(--background)),0 3px 10px color-mix(in oklch,var(--parts-accent) 40%,transparent)}.course-sidebar-parts__dot:focus-visible{outline:2px solid color-mix(in oklch,var(--parts-accent) 65%,transparent);outline-offset:3px}@keyframes course-parts-dot-land{0%{opacity:0;transform:translateY(-1.55rem) scale(.28)}42%{opacity:1;transform:translateY(.22rem) scale(1.28)}58%{transform:translateY(-.12rem) scale(.9)}74%{transform:translateY(.06rem) scale(1.12)}to{opacity:1;transform:translateY(0) scale(1.06)}}@keyframes course-parts-dot-ripple{0%,to{transform:scale(1)}28%{transform:scale(1.2)}52%{transform:scale(.9)}74%{transform:scale(1.06)}}@keyframes course-parts-shockwave{0%{opacity:.65;transform:scale(.45)}35%{opacity:.4}to{opacity:0;transform:scale(2.7)}}.course-sidebar-parts.is-intro .course-sidebar-parts__dot.is-active{animation:course-parts-dot-land .88s cubic-bezier(.2,1.2,.32,1) both}.course-sidebar-parts.is-intro .course-sidebar-parts__dot.is-active:after{content:"";position:absolute;inset:-3px;z-index:0;border-radius:0;border:2px solid color-mix(in oklch,var(--parts-accent) 72%,transparent);pointer-events:none;animation:course-parts-shockwave .85s ease-out .38s both}.course-sidebar-parts.is-intro .course-sidebar-parts__item:not(.is-active) .course-sidebar-parts__dot{animation:course-parts-dot-ripple .55s cubic-bezier(.22,1,.36,1) both;animation-delay:calc(.4s + (var(--ripple-delay, 0) * 1ms))}.course-sidebar-parts.is-intro .course-sidebar-parts__dot.is-active:hover,.course-sidebar-parts.is-intro .course-sidebar-parts__dot:hover{transform:none}@media (prefers-reduced-motion:reduce){.course-sidebar-parts.is-intro .course-sidebar-parts__dot.is-active,.course-sidebar-parts.is-intro .course-sidebar-parts__dot.is-active:after,.course-sidebar-parts.is-intro .course-sidebar-parts__item:not(.is-active) 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