.nk-header{position:fixed;top:0;left:0;right:0;height:60px;background-color:var(--header-bg,#1976d2)!important;box-shadow:0 2px 8px rgba(0,0,0,.1)}.nk-header-wrap{display:flex;align-items:center;justify-content:space-between;height:100%;padding:0 20px;gap:16px}.mobile-menu-toggle{display:none;background:transparent;border:none;color:var(--header-text,#fff);font-size:24px;padding:8px;cursor:pointer;flex-shrink:0}.app-brand{display:flex;align-items:center;flex-shrink:0;cursor:pointer}.app-brand-logo{height:40px;width:auto;max-width:200px;object-fit:contain}.nk-header-tools{display:flex;align-items:center;gap:16px;margin-left:auto}.header-action-item{display:flex;align-items:center;justify-content:center;color:var(--header-text,#fff);cursor:pointer;transition:opacity .2s}.header-action-item:hover{opacity:.8}.header-action-icon{font-size:20px}.user-avatar{width:36px;height:36px;border-radius:50%;background-color:hsla(0,0%,100%,.2);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px}.app-sidebar{position:fixed;top:60px;left:0;width:240px;height:calc(100vh - 60px);background-color:var(--sidebar-bg,#1976d2);overflow-y:auto;overflow-x:hidden;transition:all .3s ease;box-shadow:2px 0 8px rgba(0,0,0,.1)}.app-sidebar.collapsed{width:70px}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid hsla(0,0%,100%,.1);min-height:60px}.sidebar-content{flex:1;overflow-y:auto;padding:8px 0}.sidebar-menu{list-style:none;padding:0;margin:0}.sidebar-item{margin:4px 0}.sidebar-link{display:flex;align-items:center;padding:12px 20px;color:hsla(0,0%,100%,.8);text-decoration:none;transition:all .2s;gap:12px}.sidebar-link:hover{background-color:hsla(0,0%,100%,.1);color:#fff}.sidebar-link.active{background-color:hsla(0,0%,100%,.15);color:#fff;border-left:3px solid #fff}.sidebar-icon{width:24px;height:24px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.sidebar-icon i{font-size:18px}.sidebar-text{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.app-sidebar.collapsed .sidebar-text{display:none}.app-sidebar.collapsed .sidebar-link{justify-content:center;padding:12px}.app-sidebar.collapsed .sidebar-header{justify-content:center}.main-content{margin-left:240px;margin-top:60px;padding:20px;min-height:calc(100vh - 60px);transition:margin-left .3s ease}.main-content.sidebar-collapsed{margin-left:70px}@media (max-width:991px){.mobile-menu-toggle{display:flex!important}.app-sidebar{left:-240px}.app-sidebar.mobile-visible{left:0}.main-content,.main-content.sidebar-collapsed{margin-left:0}}@media (max-width:767px){.nk-header-wrap{padding:0 12px;gap:8px}.app-brand-logo{height:35px;max-width:150px}.nk-header-tools{gap:12px}.header-action-icon{font-size:18px}.user-avatar{width:32px;height:32px;font-size:12px}.main-content{padding:16px}}@media (max-width:480px){.nk-header-wrap{padding:0 8px;gap:6px}.app-brand-logo{height:30px;max-width:120px}.nk-header-tools{gap:8px}.header-action-icon{font-size:16px}.user-avatar{width:28px;height:28px}.main-content{padding:12px}}.app-sidebar::-webkit-scrollbar{width:6px}.app-sidebar::-webkit-scrollbar-track{background:hsla(0,0%,100%,.05)}.app-sidebar::-webkit-scrollbar-thumb{background:hsla(0,0%,100%,.2);border-radius:3px}.app-sidebar::-webkit-scrollbar-thumb:hover{background:hsla(0,0%,100%,.3)}*{transition-property:background-color,color,border-color,opacity;transition-duration:.2s;transition-timing-function:ease}.app-sidebar,.main-content,.nk-header{box-sizing:border-box}.nk-header{z-index:1000}.app-sidebar{z-index:999}.sidebar-overlay{z-index:998}.main-content{z-index:1}