* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --success-color: #4CAF50;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --border-color: #e0e0e0;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.api-status {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.2);
    font-size: 0.9rem;
}

.api-status.connected {
    background: var(--success-color);
}

.api-status.error {
    background: var(--danger-color);
}

.user-info {
    color: white;
    font-size: 0.9rem;
}

/* 导航标签 */
.nav-tabs {
    background: var(--card-bg);
    padding: 0 2rem;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.tab-btn {
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: var(--bg-color);
}

.tab-btn.active {
    border-bottom-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
}

/* 主内容 */
.main-content {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 工具栏 */
.toolbar {
    background: var(--card-bg);
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.toolbar input[type="text"] {
    flex: 1;
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
}

.toolbar select {
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
}

/* 按钮样式 */
.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #45a049;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #1976D2;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #d32f2f;
}

.btn-warning {
    background: var(--warning-color);
    color: white;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

/* 数据网格 */
.data-grid {
    display: grid;
    gap: 1rem;
}

.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.card-subtitle {
    font-size: 0.9rem;
    color: #666;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
}

.card-content {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
}

.card-meta {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: #999;
}

.badge {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-primary {
    background: #e3f2fd;
    color: #1976D2;
}

.badge-success {
    background: #e8f5e9;
    color: #388e3c;
}

.badge-warning {
    background: #fff3e0;
    color: #f57c00;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content h2 {
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.close {
    float: right;
    font-size: 2rem;
    font-weight: bold;
    color: #999;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: var(--danger-color);
}

/* 表单 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-group select[multiple] {
    min-height: 150px;
    padding: 0.5rem;
}

.form-group select[multiple] option {
    padding: 0.5rem;
    margin: 0.2rem 0;
    border-radius: 4px;
    cursor: pointer;
}

.form-group select[multiple] option:hover {
    background-color: #e3f2fd;
}

.form-group select[multiple] option:checked {
    background-color: var(--primary-color);
    color: white;
}

.form-group small {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.85rem;
}

/* Toast 通知 */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--text-color);
    color: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    display: none;
    z-index: 2000;
    animation: slideInUp 0.3s ease;
}

@keyframes slideInUp {
    from {
        transform: translateY(100px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.toast.show {
    display: block;
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

.toast.warning {
    background: var(--warning-color);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 2rem;
}

.pagination button {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pagination button:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

.pagination button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: #999;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 2rem;
}

.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .header-actions {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-tabs {
        padding: 0 1rem;
        overflow-x: auto;
    }

    .main-content {
        padding: 0 1rem;
    }

    .toolbar {
        flex-direction: column;
    }

    .modal-content {
        width: 95%;
        padding: 1.5rem;
    }
}