.collapse{border:1px solid #e8f0fe;border-radius:8px;margin:8px 0;background:#fff;overflow:hidden;transition:all .3s ease;visibility:visible}.collapse:hover{border-color:#4f8cff;box-shadow:0 2px 8px rgba(79,140,255,.1)}.collapse-header{padding:12px 16px;background:#f8fafc;border-bottom:1px solid #e8f0fe;cursor:pointer;display:flex;justify-content:space-between;align-items:center;-webkit-user-select:none;-moz-user-select:none;user-select:none;transition:background-color .2s ease}.collapse-header:hover{background:#e8f0fe}.collapse-title{font-weight:600;color:#4f8cff;font-size:.98rem}.collapse-arrow{color:#4f8cff;transition:transform .3s ease;font-size:.8rem}.collapse-arrow.open{transform:rotate(180deg)}.collapse-content{max-height:0;overflow:hidden;transition:max-height .3s ease-out}.collapse-content.open{max-height:1000px;transition:max-height .3s ease-in}.collapse-body{padding:16px;color:#555;line-height:1.5;white-space:pre-line}.collapse .timeline{margin:0}.collapse-body h4{margin:0 0 8px;color:#4f8cff;font-size:.95rem;font-weight:600}.collapse-body p{margin:0;line-height:1.5}