.accordion-section{border-bottom:1px solid #ddd}.accordion-section:last-child{border-bottom:none}.accordion-header{background:#f8f9fa;padding:15px 20px;font-weight:600;font-size:16px;color:#333;cursor:pointer;user-select:none;transition:background-color 0.3s;border-left:4px solid #667eea;position:relative}.accordion-header::after{content:'+';position:absolute;right:20px;font-size:20px;transition:transform 0.3s}.accordion-header.active::after{transform:rotate(45deg)}