.course-container[data-astro-cid-bks3gknv]{display:flex;max-width:1400px;margin:0 auto;min-height:calc(100vh - var(--header-height));position:relative}.course-sidebar[data-astro-cid-bks3gknv]{width:var(--sidebar-width);flex-shrink:0;border-right:1px solid var(--border);background:var(--bg-alt);position:sticky;top:var(--header-height);height:calc(100vh - var(--header-height));overflow-y:auto;padding:var(--space-6) var(--space-4)}.course-sidebar__header[data-astro-cid-bks3gknv]{margin-bottom:var(--space-6);padding-bottom:var(--space-4);border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:var(--space-2)}.course-sidebar__header[data-astro-cid-bks3gknv] h3[data-astro-cid-bks3gknv]{font-size:var(--text-lg);font-weight:var(--weight-bold);color:var(--color-secondary);margin:0}.course-sidebar__nav[data-astro-cid-bks3gknv] ul[data-astro-cid-bks3gknv]{display:flex;flex-direction:column;gap:var(--space-1);list-style:none;padding:0;margin:0}.course-sidebar__item-container[data-astro-cid-bks3gknv]{display:flex;flex-direction:column;list-style:none}.course-sidebar__item-header[data-astro-cid-bks3gknv]{display:flex;align-items:center;justify-content:space-between;width:100%;background:transparent;border:none;padding:var(--space-3) var(--space-4);border-radius:var(--radius);cursor:pointer;text-align:left;transition:all var(--transition-fast);gap:var(--space-2)}.course-sidebar__item-header[data-astro-cid-bks3gknv]:hover,.course-sidebar__item-header[data-astro-cid-bks3gknv].is-active-header{background:var(--color-primary-light);color:var(--color-primary)}.course-sidebar__link[data-astro-cid-bks3gknv]{flex:1;display:flex;align-items:center;gap:var(--space-2);font-size:var(--text-sm);font-family:var(--font-heading);color:inherit;text-decoration:none;line-height:1.4;width:100%}.course-sidebar__link[data-astro-cid-bks3gknv].is-active-link{font-weight:var(--weight-semibold)}.part-title-wrapper[data-astro-cid-bks3gknv]{display:flex;align-items:flex-start;gap:var(--space-2);font-size:var(--text-sm);font-family:var(--font-heading);line-height:1.4;color:inherit}.course-sidebar__item-header[data-astro-cid-bks3gknv]:not(.is-active-header) .part-title-wrapper[data-astro-cid-bks3gknv]{color:var(--text-muted)}.course-sidebar__item-header[data-astro-cid-bks3gknv].is-active-header .part-title-wrapper[data-astro-cid-bks3gknv]{color:var(--color-primary);font-weight:var(--weight-semibold)}.chevron-icon[data-astro-cid-bks3gknv]{flex-shrink:0;color:var(--text-muted);transition:transform .3s cubic-bezier(.4,0,.2,1)}.course-sidebar__item-header[data-astro-cid-bks3gknv]:hover .chevron-icon[data-astro-cid-bks3gknv],.course-sidebar__item-header[data-astro-cid-bks3gknv].is-active-header .chevron-icon[data-astro-cid-bks3gknv]{color:var(--color-primary)}.course-sidebar__item-header[data-astro-cid-bks3gknv][aria-expanded=true] .chevron-icon[data-astro-cid-bks3gknv]{transform:rotate(180deg)}.sidebar-icon[data-astro-cid-bks3gknv]{flex-shrink:0;margin-top:2px;color:var(--text-muted);transition:color var(--transition-fast)}.course-sidebar__item-header[data-astro-cid-bks3gknv]:hover .sidebar-icon[data-astro-cid-bks3gknv],.course-sidebar__item-header[data-astro-cid-bks3gknv].is-active-header .sidebar-icon[data-astro-cid-bks3gknv]{color:var(--color-primary)}.course-sidebar__subnav-container[data-astro-cid-bks3gknv]{display:grid;grid-template-rows:0fr;transition:grid-template-rows .3s cubic-bezier(.4,0,.2,1),margin .3s ease;overflow:hidden}.course-sidebar__subnav-container[data-astro-cid-bks3gknv].is-expanded{grid-template-rows:1fr;margin:var(--space-2) 0}.course-sidebar__subnav[data-astro-cid-bks3gknv]{min-height:0;list-style:none;padding-left:var(--space-4);margin:0;display:flex;flex-direction:column;gap:4px}.course-sidebar__sublink[data-astro-cid-bks3gknv]{display:block;padding:var(--space-2) var(--space-3);font-size:var(--text-xs);color:var(--text-muted);text-decoration:none;border-radius:var(--radius-sm);transition:all var(--transition-fast);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.course-sidebar__sublink[data-astro-cid-bks3gknv]:hover{color:var(--color-primary);background:var(--color-primary-light)}.part-num[data-astro-cid-bks3gknv]{font-weight:var(--weight-bold);color:var(--color-primary);flex-shrink:0;margin-right:4px}.part-name[data-astro-cid-bks3gknv]{word-break:break-word}.course-content[data-astro-cid-bks3gknv]{flex:1;min-width:0;padding:var(--space-8) var(--space-12);display:flex;flex-direction:column}.course-body[data-astro-cid-bks3gknv]{flex:1;max-width:var(--content-width);margin:0 auto;width:100%}.course-footer[data-astro-cid-bks3gknv]{max-width:var(--content-width);margin:var(--space-12) auto 0;width:100%;border-top:1px solid var(--border);padding-top:var(--space-6)}.course-nav-buttons[data-astro-cid-bks3gknv]{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-6)}.course-btn[data-astro-cid-bks3gknv]{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4) var(--space-5);background:var(--bg-alt);border:1px solid var(--border);border-radius:var(--radius-lg);text-decoration:none;color:var(--text);transition:all var(--transition);cursor:pointer}.course-btn[data-astro-cid-bks3gknv]:hover{border-color:var(--color-primary);background:var(--color-primary-light);transform:translateY(-2px)}.course-btn--next[data-astro-cid-bks3gknv]{justify-content:flex-end}.course-btn--disabled[data-astro-cid-bks3gknv]{display:flex;align-items:center;justify-content:flex-end;gap:var(--space-3);padding:var(--space-4) var(--space-5);background:var(--bg-muted);border:1px solid var(--border);border-radius:var(--radius-lg);color:var(--text-light);pointer-events:none}.btn-label-wrap[data-astro-cid-bks3gknv]{display:flex;flex-direction:column;gap:2px}.text-right[data-astro-cid-bks3gknv]{text-align:right}.btn-sub[data-astro-cid-bks3gknv]{font-size:var(--text-xs);color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.btn-title[data-astro-cid-bks3gknv]{font-size:var(--text-sm);font-weight:var(--weight-bold);color:var(--color-secondary)}.course-btn--disabled[data-astro-cid-bks3gknv] .btn-title[data-astro-cid-bks3gknv]{color:var(--text-light)}.mobile-course-nav[data-astro-cid-bks3gknv]{display:none}@media(max-width:1023px){.course-container[data-astro-cid-bks3gknv]{flex-direction:column}.course-sidebar[data-astro-cid-bks3gknv]{display:none}.mobile-course-nav[data-astro-cid-bks3gknv]{display:block;background:var(--bg-alt);border-bottom:1px solid var(--border);width:100%;position:sticky;top:var(--header-height);z-index:10}.mobile-course-nav__summary[data-astro-cid-bks3gknv]{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4) var(--space-6);font-size:var(--text-sm);font-weight:var(--weight-semibold);color:var(--color-secondary);cursor:pointer;list-style:none}.mobile-course-nav__summary[data-astro-cid-bks3gknv]::-webkit-details-marker{display:none}.nav-chevron[data-astro-cid-bks3gknv]{margin-left:auto;transition:transform var(--transition)}.mobile-course-nav[data-astro-cid-bks3gknv][open] .nav-chevron[data-astro-cid-bks3gknv]{transform:rotate(180deg)}.mobile-course-nav__content[data-astro-cid-bks3gknv]{border-top:1px solid var(--border);max-height:50vh;overflow-y:auto;background:var(--bg)}.mobile-course-nav__content[data-astro-cid-bks3gknv] ul[data-astro-cid-bks3gknv]{list-style:none;padding:var(--space-2) 0;margin:0}.mobile-nav-link[data-astro-cid-bks3gknv]{display:block;padding:var(--space-3) var(--space-6);font-size:var(--text-sm);color:var(--text-muted);text-decoration:none;transition:all var(--transition-fast)}.mobile-nav-link[data-astro-cid-bks3gknv]:hover,.mobile-nav-link[data-astro-cid-bks3gknv].is-active{color:var(--color-primary);background:var(--color-primary-light);font-weight:var(--weight-semibold)}.mobile-course-nav__item[data-astro-cid-bks3gknv]{display:flex;flex-direction:column}.mobile-course-nav__subnav[data-astro-cid-bks3gknv]{list-style:none;padding-left:var(--space-8);margin:var(--space-1) 0 var(--space-3);display:flex;flex-direction:column;gap:2px}.mobile-course-nav__sublink[data-astro-cid-bks3gknv]{display:block;padding:var(--space-2) var(--space-4);font-size:var(--text-xs);color:var(--text-muted);text-decoration:none;border-radius:var(--radius-sm);transition:all var(--transition-fast)}.mobile-course-nav__sublink[data-astro-cid-bks3gknv]:hover{color:var(--color-primary);background:var(--color-primary-light)}.course-content[data-astro-cid-bks3gknv]{padding:var(--space-6) var(--space-6) var(--space-12)}}@media(max-width:640px){.course-nav-buttons[data-astro-cid-bks3gknv]{grid-template-columns:1fr;gap:var(--space-3)}}.course-sidebar__sublink[data-astro-cid-bks3gknv].is-active-sublink{color:var(--color-primary);background:var(--color-primary-light);font-weight:var(--weight-semibold);border-left:2px solid var(--color-primary);padding-left:calc(var(--space-3) - 2px)}.course-sidebar__resizer[data-astro-cid-bks3gknv]{width:6px;background:transparent;cursor:col-resize;position:relative;z-index:10;transition:background .2s ease;user-select:none;-webkit-user-select:none;flex-shrink:0}.course-sidebar__resizer[data-astro-cid-bks3gknv]:hover,.course-sidebar__resizer[data-astro-cid-bks3gknv].is-dragging{background:var(--color-primary-light)}.course-sidebar__resizer[data-astro-cid-bks3gknv]:after{content:"";position:absolute;top:0;bottom:0;left:2px;width:1px;background:var(--border);transition:background .2s ease}.course-sidebar__resizer[data-astro-cid-bks3gknv]:hover:after,.course-sidebar__resizer[data-astro-cid-bks3gknv].is-dragging:after{background:var(--color-primary);width:2px;left:2px}.course-container[data-astro-cid-bks3gknv].is-resizing{cursor:col-resize;user-select:none;-webkit-user-select:none}.course-container[data-astro-cid-bks3gknv].is-resizing .course-sidebar[data-astro-cid-bks3gknv]{transition:none!important}@media(max-width:1023px){.course-sidebar__resizer[data-astro-cid-bks3gknv]{display:none}}