/* 教育管理系统 - 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

/* 容器 */
.container {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 - 统一浅色风格 */
.sidebar {
    position: fixed;
    left: 0;
    top: 70px;
    bottom: 0;
    width: 260px;
    background: white;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    padding: 20px 0;
    overflow-y: auto;
    z-index: 100;
}

.menu-section {
    padding: 0 20px 20px;
}

.menu-title {
    font-size: 12px;
    font-weight: 600;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0 16px 10px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    margin: 4px 0;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    color: #64748b;
    text-decoration: none;
}

.nav-item:hover {
    background: #f1f5f9;
    color: #4f46e5;
}

.nav-item.active {
    background: linear-gradient(135deg, #4f46e5, #4338ca);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.nav-item i {
    width: 24px;
    text-align: center;
    font-size: 18px;
}

/* 主内容区 */
.main-content {
    margin-left: 260px;
    padding: 30px;
    min-height: 100vh;
}

/* 页面头部 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 28px;
    color: #1e293b;
}

.header-actions {
    display: flex;
    gap: 12px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
    background: #e0e0e0;
    color: #666;
}

.btn-secondary:hover {
    background: #d0d0d0;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

/* 卡片 */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 18px;
    color: #1e293b;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header h3 i {
    color: #4f46e5;
}

.card-body {
    padding: 24px;
}

/* 表格 */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}

.data-table th {
    font-weight: 600;
    color: #64748b;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: #f8fafc;
}

.data-table tbody tr:hover {
    background: #f8fafc;
}

/* 状态标签 */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.status-info {
    background: #dbeafe;
    color: #2563eb;
}

.status-warning {
    background: #fef3c7;
    color: #d97706;
}

.status-success {
    background: #d1fae5;
    color: #059669;
}

.status-danger {
    background: #fee2e2;
    color: #dc2626;
}

.status-primary {
    background: #f3e8ff;
    color: #7c3aed;
}

.status-secondary {
    background: #f3f4f6;
    color: #6b7280;
}

/* 搜索栏 */
.search-bar {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.search-input {
    flex: 1;
    display: flex;
    align-items: center;
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 0 16px;
}

.search-input i {
    color: #9ca3af;
    margin-right: 12px;
}

.search-input input {
    flex: 1;
    border: none;
    padding: 12px 0;
    font-size: 14px;
    outline: none;
    background: transparent;
}

.form-select {
    padding: 12px 16px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    background: white;
    min-width: 150px;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

.pagination button {
    padding: 10px 18px;
    border: 1px solid #e0e0e0;
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.pagination button:hover:not(:disabled) {
    background: #4f46e5;
    color: white;
    border-color: #4f46e5;
}

.pagination button.active {
    background: #4f46e5;
    color: white;
    border-color: #4f46e5;
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4f46e5, #7c3aed);
    border-radius: 4px;
    transition: width 0.3s;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 18px;
    color: #1e293b;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    color: #9ca3af;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.3s;
}

.close-btn:hover {
    background: #f3f4f6;
    color: #374151;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid #f0f0f0;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* 表单 */
.form-group {
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: #4b5563;
}

.form-group .required {
    color: #dc2626;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .container {
        flex-direction: column;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .search-bar {
        flex-direction: column;
    }
}