:root{--sidebar-width:260px;--header-height:56px;--primary-color:#0052d9;--text-main:#333;--text-secondary:#666;--bg-sidebar:#f7f8fa;--bg-hover:#eef2f8;--border-color:#e3e6eb}body{color:var(--text-main);background-color:#f0f2f5;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.app-container{width:100vw;height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);background-color:var(--bg-sidebar);border-right:1px solid var(--border-color);flex-direction:column;flex-shrink:0;display:flex}.sidebar-header{height:var(--header-height);border-bottom:1px solid var(--border-color);align-items:center;padding:0 20px;display:flex}.logo-image{object-fit:contain;width:24px;height:24px;margin-right:12px}.logo-text{color:var(--text-main);font-size:16px;font-weight:600}.sidebar-nav{flex:1;padding:16px 12px;overflow-y:auto}.nav-group{margin-bottom:8px}.nav-group-header{cursor:pointer;color:var(--text-secondary);border-radius:4px;padding:8px}.nav-group-header:hover{background-color:#ebecef}.nav-group-title{align-items:center;gap:8px;font-size:14px;font-weight:600;display:flex}.nav-group-children{flex-direction:column;gap:4px;margin-top:4px;margin-left:24px;display:flex}.nav-item{cursor:pointer;color:var(--text-main);border-radius:4px;align-items:center;gap:8px;padding:8px 12px;font-size:14px;transition:all .2s;display:flex}.nav-item:hover{background-color:var(--bg-hover)}.nav-item.active{color:var(--primary-color);background-color:#e5f0ff;font-weight:500}.nav-item-icon{color:inherit;align-items:center;display:flex}.main-content{flex-direction:column;flex:1;min-width:0;display:flex}.top-header{height:var(--header-height);border-bottom:1px solid var(--border-color);background-color:#fff;flex-shrink:0;justify-content:space-between;align-items:center;padding:0 24px;display:flex}.breadcrumb-simple{color:var(--text-secondary);font-size:14px}.user-profile{cursor:pointer;align-items:center;gap:8px;font-size:14px;display:flex}.avatar{background-color:var(--primary-color);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;font-weight:700;display:flex}.empty-state{color:var(--text-secondary);flex:1;justify-content:center;align-items:center;display:flex}.iframe-container{background-color:#f0f2f5;flex:1;padding:16px;display:flex;overflow:hidden}.content-iframe{background-color:#fff;border:none;border-radius:8px;flex:1;width:100%;height:100%;box-shadow:0 1px 3px #0000000d}