:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh}html,body{height:100%;margin:0;padding:0;overflow:hidden}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f0f2f5;color:#333}#app{height:100%}.app{height:100%;display:flex}.sidebar{width:220px;background:linear-gradient(180deg,#1a1f36,#252b48);display:flex;flex-direction:column;transition:width .3s ease;flex-shrink:0}.sidebar.collapsed{width:60px}.sidebar-header{padding:1rem;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(255,255,255,.1);min-height:60px}.logo{color:#fff;font-size:1.1rem;font-weight:600;white-space:nowrap}.toggle-btn{background:#ffffff1a;border:none;color:#fff;width:28px;height:28px;border-radius:4px;cursor:pointer;font-size:.9rem;display:flex;align-items:center;justify-content:center}.toggle-btn:hover{background:#fff3}.sidebar-nav{flex:1;padding:.5rem 0;overflow-y:auto}.sidebar-footer{padding:.5rem;border-top:1px solid rgba(255,255,255,.1)}.logout-btn{display:flex;align-items:center;width:100%;padding:.85rem 1.25rem;color:#ffffffb3;background:transparent;border:none;cursor:pointer;transition:all .2s ease;margin:.2rem .5rem;border-radius:8px;font-size:1rem}.logout-btn:hover{background:#ffffff1a;color:#fff}.nav-item{display:flex;align-items:center;padding:.85rem 1.25rem;color:#ffffffb3;text-decoration:none;transition:all .2s ease;margin:.2rem .5rem;border-radius:8px}.nav-item:hover{background:#ffffff1a;color:#fff}.nav-item.active{background:#3498db;color:#fff}.nav-icon{font-size:1.1rem;min-width:28px;text-align:center}.nav-label{margin-left:.75rem;white-space:nowrap}.main-content{flex:1;overflow:auto;padding:1.5rem}