*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f0f2f5;color:#333}#app-container{display:flex;min-height:100vh}.sidebar{width:240px;background:#1a1a2e;color:#fff;padding:20px 0;display:flex;flex-direction:column;overflow-y:auto}.sidebar .logo{padding:0 20px 20px;border-bottom:1px solid #16213e;margin-bottom:10px}.sidebar h2{font-size:18px}.nav-section{margin-bottom:8px}.nav-section-title{padding:8px 20px 4px;font-size:11px;text-transform:uppercase;color:#6b7280;letter-spacing:.5px}.nav-item{padding:10px 20px;color:#a0aec0;text-decoration:none;font-size:14px;display:block;transition:all .2s;border-left:3px solid transparent}.nav-item:hover,.nav-item.router-link-active{background:#16213e;color:#fff}.nav-item.router-link-active{border-left-color:#4361ee}.main-content{flex:1;padding:24px;overflow-y:auto}