.cos-doc-viewer[data-v-adfde358]{width:100%;height:100%;position:relative;background:#f5f5f5;overflow:hidden;min-height:600px}.cos-doc-viewer.is-fullscreen[data-v-adfde358]{position:fixed;top:0;left:0;right:0;bottom:0;z-index:9999;width:100vw;height:100vh;min-height:100vh}.cos-preview-iframe[data-v-adfde358]{width:100%;height:100%;border:none;display:block;min-height:600px}.video-container[data-v-adfde358]{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#000}.preview-video[data-v-adfde358]{width:100%;height:100%;max-height:100%;-o-object-fit:contain;object-fit:contain}.audio-container[data-v-adfde358]{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#f5f5f5}.preview-audio[data-v-adfde358]{width:80%;max-width:600px;display:block}.image-container[data-v-adfde358]{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#f5f5f5}.preview-image[data-v-adfde358]{max-width:100%;max-height:100%;-o-object-fit:contain;object-fit:contain;display:block}.fullscreen-btn[data-v-adfde358]{position:absolute;top:16px;right:16px;z-index:1000;background:rgba(0,0,0,.7);color:#fff;padding:8px 16px;border-radius:4px;cursor:pointer;display:flex;align-items:center;gap:6px;font-size:14px;transition:all .3s}.fullscreen-btn[data-v-adfde358]:hover{background:rgba(0,0,0,.9);transform:scale(1.05)}.loading-container[data-v-adfde358]{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;min-height:400px;color:#409eff;padding:40px}.loading-container i[data-v-adfde358]{font-size:48px;margin-bottom:16px;animation:rotating-adfde358 2s linear infinite}.hint-text[data-v-adfde358]{margin-top:8px;font-size:12px;color:#909399}.error-container[data-v-adfde358]{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;min-height:400px;color:#f56c6c;padding:40px}.error-container i[data-v-adfde358]{font-size:64px;margin-bottom:16px}.error-message[data-v-adfde358]{margin:8px 0 16px 0;font-size:14px;color:#606266}@keyframes rotating-adfde358{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.materials-panel[data-v-03a79bcc]{padding:24px;background:var(--classroom-bg);min-height:100vh;max-width:1600px;margin:0 auto}.header[data-v-03a79bcc]{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;padding:20px 24px;background:#fff;border-radius:12px;box-shadow:0 2px 8px rgba(74,144,226,.08)}.header h3[data-v-03a79bcc]{font-size:22px;color:var(--classroom-text);margin:0;font-weight:700}.actions[data-v-03a79bcc]{display:flex;gap:10px}.content-layout-split[data-v-03a79bcc]{display:grid;grid-template-columns:400px 1fr;gap:16px;height:calc(100vh - 140px)}.file-list-panel[data-v-03a79bcc]{display:flex;flex-direction:column;background:#fff;border-radius:8px;box-shadow:0 2px 8px rgba(74,144,226,.08);overflow:hidden}.tree-sidebar[data-v-03a79bcc]{padding:12px;border-bottom:1px solid #e4e7ed;background:#f5f7fa;max-height:200px;overflow-y:auto}.tree-header[data-v-03a79bcc]{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;margin-bottom:8px;background:#fff;border-radius:6px}.tree-title[data-v-03a79bcc]{font-size:13px;font-weight:600;color:#303133}.folder-tree[data-v-03a79bcc]{background:#fff;padding:8px;border-radius:6px}.custom-tree-node[data-v-03a79bcc]{flex:1;display:flex;align-items:center;justify-content:space-between;font-size:13px;padding-right:4px}.node-label[data-v-03a79bcc]{flex:1;display:flex;align-items:center;gap:6px;overflow:hidden}.node-label i[data-v-03a79bcc]{font-size:14px;color:#e6a23c}.node-actions[data-v-03a79bcc]{display:flex;gap:2px;padding-left:8px;opacity:0;transition:opacity .2s ease}.custom-tree-node:hover .node-actions[data-v-03a79bcc]{opacity:1}.node-actions .el-button[data-v-03a79bcc]{padding:4px}.node-actions .delete-btn[data-v-03a79bcc]{color:#f56c6c}.node-actions .delete-btn[data-v-03a79bcc]:hover{color:#f56c6c;background-color:#fef0f0}.context-menu-wrapper[data-v-03a79bcc]{position:fixed;z-index:9999}.context-menu[data-v-03a79bcc]{border:1px solid #e0e6ed;box-shadow:0 2px 12px rgba(0,0,0,.15);border-radius:8px;padding:4px 0;min-width:180px;background:#fff}.context-menu .el-menu-item[data-v-03a79bcc]{padding:10px 20px;font-size:14px;color:#2c3e50;line-height:1.5}.context-menu .el-menu-item i[data-v-03a79bcc]{margin-right:10px;font-size:16px}.context-menu .el-menu-item[data-v-03a79bcc]:hover{background-color:#f8f9fa}.context-menu .danger-item[data-v-03a79bcc]{color:#f56c6c}.context-menu .danger-item[data-v-03a79bcc]:hover{background-color:#fef0f0;color:#f56c6c}.files-list[data-v-03a79bcc]{flex:1;display:flex;flex-direction:column;overflow:hidden}.files-list>div[data-v-03a79bcc]{flex:1;overflow-y:auto;padding:12px}.section[data-v-03a79bcc]{margin-bottom:16px}.section[data-v-03a79bcc]:last-child{margin-bottom:0}.file-item[data-v-03a79bcc]{display:flex;align-items:center;gap:8px;padding:10px 12px;background:#f5f7fa;border-radius:6px;cursor:pointer;transition:all .2s;margin-bottom:6px}.file-item[data-v-03a79bcc]:hover{background:#e6f0ff;transform:translateX(2px)}.file-item.active[data-v-03a79bcc]{background:#e6f0ff;border-left:3px solid #409eff}.file-item i[data-v-03a79bcc]{font-size:18px;color:#409eff;flex-shrink:0}.file-item.folder-item i[data-v-03a79bcc]{color:#e6a23c}.file-info[data-v-03a79bcc]{flex:1;min-width:0}.file-name[data-v-03a79bcc]{font-size:13px;color:#303133;font-weight:500;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-size[data-v-03a79bcc]{font-size:11px;color:#909399;margin-top:2px}.file-actions[data-v-03a79bcc]{display:flex;gap:4px;flex-shrink:0}.empty-state[data-v-03a79bcc]{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;color:#909399}.empty-state i[data-v-03a79bcc]{font-size:64px;margin-bottom:16px;color:#c0c4cc}.empty-state p[data-v-03a79bcc]{margin:4px 0;font-size:14px}.empty-state .hint[data-v-03a79bcc]{font-size:12px;color:#c0c4cc}.preview-panel[data-v-03a79bcc]{background:#fff;border-radius:8px;box-shadow:0 2px 8px rgba(74,144,226,.08);display:flex;flex-direction:column;overflow:hidden}.preview-panel.empty[data-v-03a79bcc]{justify-content:center;align-items:center;background:#f5f7fa}.empty-hint[data-v-03a79bcc]{text-align:center;color:#909399}.empty-hint i[data-v-03a79bcc]{font-size:64px;color:#c0c4cc;margin-bottom:16px}.empty-hint p[data-v-03a79bcc]{margin:8px 0;font-size:14px}.hint-text[data-v-03a79bcc]{font-size:12px!important;color:#c0c4cc!important}.office-preview-error[data-v-03a79bcc]{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;color:#909399;padding:40px;text-align:center}.office-preview-error i[data-v-03a79bcc]{font-size:64px;color:#e6a23c;margin-bottom:16px}.office-preview-error p[data-v-03a79bcc]{margin:8px 0;font-size:14px}.preview-header[data-v-03a79bcc]{display:flex;justify-content:space-between;align-items:flex-start;padding:16px 20px;border-bottom:1px solid #e4e7ed;background:#f5f7fa}.preview-info[data-v-03a79bcc]{flex:1;min-width:0}.current-path[data-v-03a79bcc]{font-size:12px;color:#909399;display:flex;align-items:center;gap:4px;margin-bottom:6px}.current-path i[data-v-03a79bcc]{font-size:13px;color:#e6a23c}.current-path span[data-v-03a79bcc]{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-title[data-v-03a79bcc]{font-size:14px;font-weight:600;color:#303133;display:flex;align-items:center;gap:8px;overflow:hidden}.file-title i[data-v-03a79bcc]{font-size:20px;color:#409eff;flex-shrink:0}.preview-actions[data-v-03a79bcc]{display:flex;gap:8px;flex-shrink:0}.preview-content[data-v-03a79bcc]{flex:1;background:#f5f5f5;position:relative;overflow:auto;min-height:600px}.preview-iframe[data-v-03a79bcc]{width:100%;height:100%;border:none;background:#fff;display:block}.pdf-wrapper[data-v-03a79bcc]{position:relative;width:100%;height:100%;display:flex;flex-direction:column;background:#525252}.pdf-toolbar[data-v-03a79bcc]{display:flex;justify-content:space-between;align-items:center;padding:8px 16px;background:#323232;color:#fff;border-bottom:1px solid #444;flex-shrink:0}.pdf-toolbar-left[data-v-03a79bcc],.pdf-toolbar-right[data-v-03a79bcc]{display:flex;align-items:center;gap:8px}.pdf-page-info[data-v-03a79bcc]{padding:0 12px;font-size:13px;color:#fff;min-width:60px;text-align:center}.pdf-canvas-container[data-v-03a79bcc]{flex:1;overflow:auto;display:flex;justify-content:center;padding:20px;background:#525252}.pdf-canvas-container canvas[data-v-03a79bcc]{box-shadow:0 2px 8px rgba(0,0,0,.3);background:#fff;max-width:100%;height:auto}.pdf-toolbar-mask[data-v-03a79bcc]{position:absolute;top:0;left:0;right:0;height:48px;z-index:10;pointer-events:auto;background:transparent;cursor:default}.preview-video[data-v-03a79bcc]{width:100%;max-height:100%;display:block}.preview-audio[data-v-03a79bcc]{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.audio-icon[data-v-03a79bcc]{text-align:center;margin-top:20px}.audio-icon i[data-v-03a79bcc]{font-size:80px;opacity:.8}.audio-icon p[data-v-03a79bcc]{margin-top:16px;font-size:16px}.preview-image[data-v-03a79bcc]{display:flex;justify-content:center;align-items:center;height:100%;background:#f5f5f5}.preview-image img[data-v-03a79bcc]{max-width:100%;max-height:100%;-o-object-fit:contain;object-fit:contain}.preview-unsupported[data-v-03a79bcc]{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;color:#909399}.preview-unsupported i[data-v-03a79bcc]{font-size:64px;color:#c0c4cc;margin-bottom:16px}.preview-unsupported p[data-v-03a79bcc]{margin-bottom:16px;font-size:14px}@media (max-width:1024px){.content-layout-split[data-v-03a79bcc]{grid-template-columns:320px 1fr}}.permission-dialog .permission-header[data-v-03a79bcc]{padding-bottom:16px;border-bottom:1px solid #e4e7ed;margin-bottom:16px}.permission-dialog .material-info[data-v-03a79bcc]{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:500;color:#303133;margin-bottom:12px}.permission-dialog .material-info i[data-v-03a79bcc]{font-size:18px;color:#409eff}.permission-dialog .batch-actions[data-v-03a79bcc]{display:flex;gap:8px;flex-wrap:wrap}.permission-dialog .student-info[data-v-03a79bcc]{display:flex;flex-direction:column}.permission-dialog .student-name[data-v-03a79bcc]{font-size:14px;font-weight:500;color:#303133}.permission-dialog .student-username[data-v-03a79bcc]{font-size:12px;color:#909399;margin-top:2px}@media (max-width:768px){.permission-dialog .batch-actions[data-v-03a79bcc]{flex-direction:column}.permission-dialog .batch-actions .el-button[data-v-03a79bcc]{width:100%}}@media (max-width:768px){.materials-panel[data-v-03a79bcc]{padding:16px}.content-layout-split[data-v-03a79bcc]{grid-template-columns:1fr;grid-template-rows:auto 1fr;height:auto}.file-list-panel[data-v-03a79bcc]{max-height:400px}.preview-panel[data-v-03a79bcc]{min-height:500px}.header[data-v-03a79bcc]{flex-direction:column;gap:16px}.actions[data-v-03a79bcc]{width:100%;flex-direction:column}.actions .el-button[data-v-03a79bcc]{width:100%}}.office-preview-container[data-v-03a79bcc]{width:100%;height:100%;display:flex;flex-direction:column}.office-wrapper[data-v-03a79bcc]{position:relative;width:100%;height:100%;flex:1}.office-viewer-iframe[data-v-03a79bcc]{width:100%;height:100%;border:none}.office-download-mask[data-v-03a79bcc]{position:absolute;bottom:0;right:0;width:60px;height:60px;z-index:9999;pointer-events:auto;background:transparent;cursor:default}.office-loading[data-v-03a79bcc]{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;color:#409eff}.office-loading i[data-v-03a79bcc]{font-size:48px;animation:rotating-03a79bcc 2s linear infinite;margin-bottom:16px}.office-loading p[data-v-03a79bcc]{margin:8px 0;font-size:16px;font-weight:500}@keyframes rotating-03a79bcc{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}