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#e8ecf1;flex-shrink:0;align-items:center;gap:16px;height:60px;padding:0 24px;display:flex;position:sticky;top:0;box-shadow:0 1px 4px #0000000a}.teacher-header .mobile-menu-btn[data-v-633966b1]{color:var(--color-text-secondary);cursor:pointer;background:0 0;border:none;border-radius:8px;align-items:center;padding:6px;display:flex}.teacher-header .mobile-menu-btn[data-v-633966b1]:hover{background:var(--color-bg-gray)}.teacher-header .header-breadcrumb[data-v-633966b1]{flex:1}.teacher-header .header-right[data-v-633966b1]{align-items:center;gap:16px;display:flex}.teacher-header .header-right .platform-name[data-v-633966b1]{color:var(--color-text-secondary);font-size:13px;font-weight:500}.teacher-content[data-v-633966b1]{background:var(--color-bg-gray);flex:1;padding:24px}.mobile-overlay[data-v-633966b1]{z-index:299;background:#00000080;position:fixed;inset:0}@media (width<=768px){.teacher-sidebar[data-v-633966b1]{transition:transform 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