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0}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--c-border)}.builder-wrap{display:flex;flex-direction:column;height:calc(100vh - 56px);overflow:hidden}.builder-topbar{display:flex;align-items:center;gap:var(--s-4);padding:var(--s-3) var(--s-5);background:var(--c-surface);border-bottom:1px solid var(--c-border);flex-shrink:0}.builder-title{font-weight:600;font-size:var(--fs-16);flex:1}.builder-body{display:grid;grid-template-columns:300px 1fr;flex:1;overflow:hidden}.builder-left{border-right:1px solid var(--c-border);overflow-y:auto;padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3);background:var(--c-bg)}.builder-right{overflow-y:auto;padding:var(--s-6)}.builder-empty{display:flex;align-items:center;justify-content:center;height:100%;text-align:center}.modules-list{display:flex;flex-direction:column;gap:var(--s-2)}.builder-module{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r-md);overflow:hidden}.module-header{display:flex;align-items:center;gap:var(--s-2);padding:var(--s-3) var(--s-3);cursor:pointer;-webkit-user-select:none;user-select:none;font-weight:500;font-size:var(--fs-14)}.module-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chevron{font-size:10px;color:var(--c-muted)}.drag-handle{cursor:grab;color:var(--c-muted);font-size:16px;flex-shrink:0}.lessons-list{padding:0 var(--s-3) var(--s-2);display:flex;flex-direction:column;gap:2px}.builder-lesson{display:flex;align-items:center;gap:var(--s-2);padding:var(--s-2) var(--s-3);border-radius:var(--r-sm);cursor:pointer;font-size:var(--fs-13)}.builder-lesson:hover{background:var(--c-bg)}.builder-lesson.active{background:var(--c-primary);color:#fff}.builder-lesson.active .drag-handle{color:#fff9}.lesson-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.add-lesson-btn{margin:var(--s-2) var(--s-3) var(--s-3);width:calc(100% - 24px)}.add-module-btn{margin-top:auto}.lesson-form{max-width:640px}.lesson-form h3{margin-bottom:var(--s-5);font-size:var(--fs-18)}.drive-field-row{display:flex;align-items:center;gap:var(--s-3);flex-wrap:wrap;margin-top:var(--s-2)}.file-name{font-size:var(--fs-13);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.attachments-list{display:flex;flex-direction:column;gap:var(--s-2);margin-top:var(--s-2)}.attachment-row{display:flex;align-items:center;gap:var(--s-3);padding:var(--s-2) var(--s-3);background:var(--c-bg);border-radius:var(--r-sm);font-size:var(--fs-13)}.attachment-row span{flex:1}.cdk-drag-preview{background:var(--c-surface);border:1px solid var(--c-primary);border-radius:var(--r-md);padding:var(--s-2) var(--s-3);box-shadow:0 4px 16px #00000026}.cdk-drag-placeholder{opacity:.3}.cdk-drag-animating{transition:transform .25s cubic-bezier(0,0,.2,1)}.viewer-wrap{display:grid;grid-template-columns:1fr 320px;height:calc(100vh - 56px);overflow:hidden}.viewer-main{overflow-y:auto;display:flex;flex-direction:column}.viewer-video-box{background:#000;width:100%;aspect-ratio:16/9;flex-shrink:0}.viewer-iframe{width:100%;height:100%;border:none;display:block}.viewer-no-video{display:flex;align-items:center;justify-content:center;height:100%}.viewer-lesson-info{padding:var(--s-5) var(--s-6)}.viewer-breadcrumb{font-size:var(--fs-13);margin-bottom:var(--s-2)}.viewer-lesson-title{font-size:var(--fs-22);font-weight:700;margin-bottom:var(--s-3)}.viewer-lesson-desc{color:var(--c-muted);font-size:var(--fs-15);margin-bottom:var(--s-5);line-height:1.6}.viewer-attachments{margin-bottom:var(--s-5)}.viewer-attachments h4{font-size:var(--fs-14);font-weight:600;margin-bottom:var(--s-3)}.attachment-link{display:flex;align-items:center;gap:var(--s-3);padding:var(--s-3) var(--s-4);background:var(--c-bg);border:1px solid var(--c-border);border-radius:var(--r-md);font-size:var(--fs-14);text-decoration:none;color:var(--c-text);margin-bottom:var(--s-2);transition:border-color .15s}.attachment-link:hover{border-color:var(--c-primary)}.viewer-actions{display:flex;align-items:center;gap:var(--s-4);padding-top:var(--s-5);border-top:1px solid var(--c-border);flex-wrap:wrap}.viewer-sidebar{border-left:1px solid var(--c-border);display:flex;flex-direction:column;overflow:hidden;background:var(--c-surface)}.sidebar-header{padding:var(--s-4) var(--s-5);border-bottom:1px solid var(--c-border);flex-shrink:0}.sidebar-course-title{font-weight:700;font-size:var(--fs-15);display:block}.sidebar-scroll{overflow-y:auto;flex:1}.sidebar-module{border-bottom:1px solid var(--c-border)}.sidebar-module-title{padding:var(--s-3) var(--s-4);font-size:var(--fs-13);font-weight:700;color:var(--c-muted);text-transform:uppercase;letter-spacing:.04em;background:var(--c-bg)}.sidebar-lesson{display:flex;align-items:flex-start;gap:var(--s-3);padding:var(--s-3) var(--s-4);cursor:pointer;font-size:var(--fs-14);transition:background .1s}.sidebar-lesson:hover{background:var(--c-bg)}.sidebar-lesson.active{background:#1f3a8a14;color:var(--c-primary);font-weight:500}.sidebar-lesson.done .lesson-check{color:var(--c-success)}.lesson-check{flex-shrink:0;font-size:12px;margin-top:2px;color:var(--c-muted)}.lesson-name{line-height:1.4}