:root{color-scheme:light;--color-page: #f3f5f7;--color-surface: #ffffff;--color-text: #18212b;--color-muted: #66717f;--color-border: #dfe3e8;--color-classroom: #2468c9;--color-success: #238552;--color-warning: #a86008;--color-danger: #b42318;--radius-panel: 6px}*{box-sizing:border-box}html,body,#app{min-height:100%;margin:0}body{color:var(--color-text);background:var(--color-page);font-family:Segoe UI,Microsoft YaHei,sans-serif;letter-spacing:0}button,input,select,textarea{font:inherit;letter-spacing:0}:root{--sidebar-width: 152px;--sidebar-collapsed-width: 56px;--header-height: 58px}body{overflow-x:hidden}.admin-shell{min-height:100vh;display:grid;grid-template-columns:var(--sidebar-width) minmax(0,1fr)}.admin-shell.is-collapsed{grid-template-columns:var(--sidebar-collapsed-width) minmax(0,1fr)}.admin-sidebar{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;min-width:0;overflow:hidden;color:#e9eef5;background:#263445}.brand-row{height:var(--header-height);display:flex;align-items:center;gap:8px;padding:0 12px;border-bottom:1px solid #3a4656}.brand-mark{width:30px;height:30px;flex:0 0 30px;display:grid;place-items:center;color:#fff;background:var(--color-classroom);border-radius:4px}.brand-name{white-space:nowrap}.domain-nav{display:grid;gap:3px;padding:10px 7px}.domain-link{min-height:40px;display:flex;align-items:center;gap:10px;min-width:0;padding:0 10px;color:#dce3eb;text-decoration:none;border-radius:4px}.domain-link:hover,.domain-link.router-link-active{color:#fff;background:#35475c}.domain-link.router-link-active{box-shadow:inset 3px 0 var(--color-classroom)}.domain-icon{width:18px;height:18px;flex:0 0 18px}.domain-label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.domain-label small{color:#aeb9c6}.sidebar-toggle{width:40px;height:40px;flex:0 0 40px;margin:4px 8px 10px auto;display:grid;place-items:center;color:#dce3eb;border:1px solid #536173;border-radius:4px;background:transparent;cursor:pointer}.sidebar-toggle svg{width:18px}.is-collapsed .brand-name,.is-collapsed .domain-label{display:none}.is-collapsed .domain-link{justify-content:center;padding:0}.is-collapsed .sidebar-toggle{margin-right:8px}.admin-stage{min-width:0}.admin-header{min-height:var(--header-height);display:flex;align-items:center;gap:16px;padding:7px 16px;background:var(--color-surface);border-bottom:1px solid var(--color-border)}.classroom-context{min-width:0;display:flex;align-items:baseline;gap:10px}.classroom-context span,.classroom-context small{color:var(--color-muted);font-size:12px}.classroom-context strong{overflow-wrap:anywhere}.account-actions{margin-left:auto;display:flex;align-items:center;gap:10px;font-size:13px;flex-shrink:0;white-space:nowrap}.account-actions button{padding:6px 9px;color:var(--color-text);border:1px solid var(--color-border);border-radius:4px;background:#fff;cursor:pointer}.admin-content{min-width:0;padding:14px}@media(max-width:899px){:root{--sidebar-width: 56px}.brand-name,.domain-label{display:none}.domain-link{justify-content:center;padding:0}.sidebar-toggle{display:none}.classroom-context{flex-wrap:wrap;gap:3px 8px}.classroom-context span{flex-basis:100%}}