.academy-layout {
            display: flex;
            height: 100vh;
            overflow: hidden;
            width: 100%;
        }
        /* 侧边栏折叠（仅桌面端生效） */
        @media (min-width: 769px) {
            .academy-layout.sidebar-collapsed .sidebar {
                width: 0 !important;
                min-width: 0 !important;
                padding: 0 !important;
                border: none !important;
                overflow: hidden !important;
            }
            .academy-layout.sidebar-collapsed .sidebar * {
                display: none !important;
            }
            .menu-toggle { display: block !important; }
        }
        .academy-main {
            flex: 1;
            overflow-y: auto;
            background: var(--bg-primary);
            display: flex;
            flex-direction: column;
        }
        .academy-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            border-bottom: 1px solid var(--border-color);
            flex-shrink: 0;
            background: var(--bg-secondary);
            flex-wrap: wrap;
            gap: 12px;
        }
        .academy-header-right {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .academy-header-left {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .academy-header-left h1 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0;
        }
        .academy-tabs {
            display: flex;
            gap: 4px;
            background: var(--bg-primary);
            border-radius: 8px;
            padding: 3px;
        }
        .academy-tab {
            padding: 8px 20px;
            border-radius: 6px;
            border: none;
            background: transparent;
            color: var(--text-secondary);
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            font-family: inherit;
            transition: all var(--transition);
        }
        .academy-tab.active {
            background: var(--accent-color);
            color: #fff;
        }
        .academy-tab:hover:not(.active) {
            color: var(--text-primary);
            background: var(--bg-secondary);
        }
        .academy-submit-btn {
            padding: 8px 18px;
            border-radius: 8px;
            border: 1px solid var(--accent-color);
            background: var(--accent-color);
            color: #fff;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            font-family: inherit;
            transition: all var(--transition);
        }
        .academy-submit-btn:hover {
            background: var(--accent-hover);
        }
        .academy-content {
            flex: 1;
            padding: 24px;
        }
        .academy-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 16px;
        }
        .academy-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            cursor: pointer;
            transition: all var(--transition);
            position: relative;
        }
        .academy-card:hover {
            border-color: var(--accent-color);
            box-shadow: 0 4px 16px rgba(0,0,0,0.08);
            transform: translateY(-2px);
        }
        .academy-card-cover {
            width: 100%;
            height: 180px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 48px;
            color: rgba(255,255,255,0.6);
            object-fit: cover;
        }
        .academy-card-body {
            padding: 16px;
        }
        .academy-card-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            line-height: 1.5;
        }
        .academy-card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 10px;
        }
        .academy-card-tag {
            font-size: 11px;
            padding: 2px 8px;
            border-radius: 4px;
            background: var(--bg-hover);
            color: var(--text-secondary);
        }
        .academy-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 12px;
            color: var(--text-tertiary);
        }
        .academy-card-price {
            font-weight: 600;
            color: var(--accent-color);
            font-size: 13px;
        }
        .academy-card-price.free {
            color: #34a853;
        }
        .academy-card-price.unlocked {
            color: #34a853;
        }
        .academy-card-author {
            color: var(--text-tertiary);
        }
        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-tertiary);
            font-size: 14px;
        }
        .empty-state .empty-icon {
            font-size: 48px;
            margin-bottom: 12px;
        }
        .pagination {
            display: flex;
            justify-content: center;
            gap: 8px;
            margin-top: 24px;
        }
        .pagination button {
            padding: 8px 14px;
            border-radius: 6px;
            border: 1px solid var(--border-color);
            background: var(--bg-secondary);
            color: var(--text-primary);
            cursor: pointer;
            font-size: 13px;
            font-family: inherit;
            transition: all var(--transition);
        }
        .pagination button:hover:not(:disabled) {
            border-color: var(--accent-color);
            background: var(--accent-color);
            color: #fff;
        }
        .pagination button:disabled {
            opacity: 0.4;
            cursor: not-allowed;
        }
        .pagination button.active {
            background: var(--accent-color);
            color: #fff;
            border-color: var(--accent-color);
        }

        /* 弹窗 */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
            align-items: center;
            justify-content: center;
        }
        .modal-overlay.show { display: flex; }
        .modal {
            background: var(--bg-secondary);
            border-radius: 16px;
            padding: 32px;
            max-width: 600px;
            width: 90%;
            max-height: 80vh;
            overflow-y: auto;
            box-shadow: 0 20px 60px rgba(0,0,0,0.2);
        }
        .modal h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 0 0 20px 0;
            color: var(--text-primary);
        }
        .modal .form-group {
            margin-bottom: 16px;
        }
        .modal .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 6px;
        }
        .modal .form-group input,
        .modal .form-group textarea,
        .modal .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            font-family: inherit;
            background: var(--bg-primary);
            color: var(--text-primary);
            box-sizing: border-box;
            resize: vertical;
        }
        .modal .form-group textarea {
            min-height: 100px;
        }
        .modal .form-actions {
            display: flex;
            gap: 10px;
            justify-content: flex-end;
            margin-top: 20px;
        }
        .modal .form-actions button {
            padding: 10px 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            background: var(--bg-primary);
            color: var(--text-primary);
            cursor: pointer;
            font-size: 14px;
            font-family: inherit;
        }
        .modal .form-actions .btn-primary {
            background: var(--accent-color);
            color: #fff;
            border-color: var(--accent-color);
        }
        .modal .form-actions .btn-primary:hover {
            background: var(--accent-hover);
        }

        /* 课程详情弹窗 */
        .course-detail-modal {
            max-width: 800px;
        }
        .course-detail-cover {
            width: 100%;
            height: 200px;
            border-radius: 12px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 64px;
            color: rgba(255,255,255,0.5);
            margin-bottom: 20px;
        }
        .course-detail-meta {
            display: flex;
            gap: 16px;
            margin-bottom: 16px;
            font-size: 13px;
            color: var(--text-tertiary);
        }
        .course-detail-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .chapter-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .chapter-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 8px;
            background: var(--bg-primary);
            margin-bottom: 8px;
            transition: all var(--transition);
        }
        .chapter-item .chapter-num {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--accent-color);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 600;
            flex-shrink: 0;
        }
        .chapter-item .chapter-info {
            flex: 1;
        }
        .chapter-item .chapter-title {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-primary);
        }
        .chapter-item .chapter-duration {
            font-size: 12px;
            color: var(--text-tertiary);
        }
        .chapter-item .chapter-lock {
            font-size: 18px;
            color: var(--text-tertiary);
        }
        .unlock-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px;
            background: linear-gradient(135deg, rgba(255,152,0,0.1), rgba(255,87,34,0.1));
            border-radius: 12px;
            margin-bottom: 20px;
        }
        .unlock-bar .unlock-info {
            font-size: 14px;
            color: var(--text-primary);
        }
        .unlock-bar .unlock-price {
            font-size: 18px;
            font-weight: 700;
            color: #ff9800;
        }
        .unlock-bar .unlock-btn {
            padding: 10px 24px;
            border-radius: 8px;
            border: none;
            background: linear-gradient(135deg, #ff9800, #f57c00);
            color: #fff;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            font-family: inherit;
        }
        .unlock-bar .unlock-btn:hover {
            opacity: 0.9;
        }

        /* 章节编辑器 */
        .chapter-editor {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 12px;
            margin-bottom: 10px;
            background: var(--bg-primary);
        }
        .chapter-editor .ch-header {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 8px;
        }
        .chapter-editor .ch-header span {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-secondary);
            flex-shrink: 0;
        }
        .chapter-editor .ch-header input {
            flex: 1;
        }
        .chapter-editor input,
        .chapter-editor textarea {
            width: 100%;
            padding: 8px 12px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 13px;
            font-family: inherit;
            background: var(--bg-secondary);
            color: var(--text-primary);
            box-sizing: border-box;
            margin-bottom: 8px;
        }
        .chapter-editor textarea {
            min-height: 60px;
            resize: vertical;
        }
        .add-chapter-btn {
            padding: 8px 16px;
            border-radius: 6px;
            border: 1px dashed var(--border-color);
            background: transparent;
            color: var(--text-secondary);
            cursor: pointer;
            font-size: 13px;
            font-family: inherit;
            width: 100%;
            margin-top: 8px;
        }
        .add-chapter-btn:hover {
            border-color: var(--accent-color);
            color: var(--accent-color);
        }
        .remove-chapter-btn {
            position: absolute;
            top: 8px;
            right: 8px;
            background: none;
            border: none;
            color: #e74c3c;
            cursor: pointer;
            font-size: 16px;
            padding: 2px 6px;
            border-radius: 4px;
        }
        .remove-chapter-btn:hover {
            background: rgba(231,76,60,0.1);
        }

        /* 工具栏 */
        .academy-toolbar {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 24px;
            flex-wrap: wrap;
        }
        .academy-search {
            position: relative;
            flex: 1;
            min-width: 200px;
            max-width: 400px;
        }
        .academy-search input {
            width: 100%;
            padding: 8px 36px 8px 14px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            font-family: inherit;
            background: var(--bg-secondary);
            color: var(--text-primary);
            box-sizing: border-box;
        }
        .academy-search input:focus {
            border-color: var(--accent-color);
            outline: none;
        }
        .search-clear {
            position: absolute;
            right: 8px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--text-tertiary);
            cursor: pointer;
            font-size: 14px;
            padding: 2px 6px;
        }
        .search-clear:hover { color: var(--text-primary); }
        .academy-sort {
            display: flex;
            gap: 4px;
            flex-shrink: 0;
        }
        .sort-btn {
            padding: 6px 14px;
            border-radius: 6px;
            border: 1px solid var(--border-color);
            background: var(--bg-secondary);
            color: var(--text-secondary);
            cursor: pointer;
            font-size: 13px;
            font-family: inherit;
            transition: all var(--transition);
        }
        .sort-btn:hover { border-color: var(--accent-color); color: var(--accent-color); }
        .sort-btn.active {
            background: var(--accent-color);
            color: #fff;
            border-color: var(--accent-color);
        }
        .academy-active-tag {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 4px 10px;
            border-radius: 6px;
            background: rgba(66,133,244,0.1);
            color: var(--accent-color);
            font-size: 13px;
            flex-shrink: 0;
        }
        .academy-active-tag button {
            background: none;
            border: none;
            color: var(--accent-color);
            cursor: pointer;
            font-size: 14px;
            padding: 0;
            line-height: 1;
        }

        /* 资讯卡片标签可点击 */
        .academy-card-tag {
            cursor: pointer;
            transition: all var(--transition);
        }
        .academy-card-tag:hover {
            background: var(--border-color);
        }

        /* 响应式 */
        @media (max-width: 768px) {
            .academy-grid {
                grid-template-columns: 1fr;
            }
            .academy-header {
                flex-wrap: wrap;
                gap: 12px;
            }
            .academy-tabs {
                order: 3;
                width: 100%;
            }
            .academy-tab {
                flex: 1;
                text-align: center;
            }
            .academy-submit-btn {
                font-size: 13px;
                padding: 6px 14px;
            }
        }