/* ==================== CSS 变量 ==================== */
:root {
    /* 颜色系统 */
    --color-primary: #6366f1;
    --color-primary-hover: #5558e3;
    --color-primary-light: #eef2ff;
    --color-secondary: #64748b;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    
    /* 中性色 */
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-text-primary: #0f172a;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== 基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 布局 ==================== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==================== 头部 ==================== */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary) 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stats-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
}

.stats-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.stats-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* ==================== 主内容 ==================== */
.main-content {
    flex: 1;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* ==================== 工具栏 ==================== */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.selection-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* ==================== 按钮 ==================== */
.btn-primary,
.btn-secondary,
.btn-text {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, #8b5cf6 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-text {
    background: transparent;
    color: var(--color-primary);
    padding: 0.5rem;
}

.btn-text:hover {
    background: var(--color-primary-light);
}

/* ==================== 表格 ==================== */
.table-container {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

#tableWrapper {
    overflow-x: auto;
}

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

.orders-table thead {
    background: var(--color-bg);
    border-bottom: 2px solid var(--color-border);
}

.orders-table th {
    padding: var(--spacing-lg);
    text-align: left;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.orders-table td {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
}

.orders-table tbody tr {
    transition: background-color var(--transition-fast);
}

.orders-table tbody tr:hover {
    background: var(--color-bg);
}

.orders-table tbody tr.selected {
    background: var(--color-primary-light);
}

/* 复选框单元格 */
.checkbox-cell {
    width: 48px;
    text-align: center;
}

/* 自定义复选框 */
.checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* 订单号 */
.order-number {
    font-weight: 600;
    color: var(--color-primary);
    font-family: 'Courier New', monospace;
}

/* 地址信息 */
.address-info {
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 商品信息 */
.items-info {
    max-width: 300px;
}

.item-name {
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.item-details {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* 金额 */
.amount {
    font-weight: 600;
    color: var(--color-text-primary);
    font-family: 'Courier New', monospace;
}

/* 备注 */
.remark {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--color-text-secondary);
    font-size: 0.8125rem;
}

/* ==================== 状态页面 ==================== */
.loading-state,
.error-state,
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    min-height: 400px;
    text-align: center;
}

.loading-state p,
.error-state p,
.empty-state p {
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
}

.error-state h3,
.empty-state h3 {
    margin-top: var(--spacing-lg);
    font-size: 1.25rem;
    color: var(--color-text-primary);
}

/* 加载动画 */
.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==================== Toast 通知 ==================== */
.toast-container {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    min-width: 320px;
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    animation: slideIn 0.3s ease-out;
    border-left: 4px solid var(--color-primary);
}

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

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

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

.toast-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.toast-message {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.toast-close {
    flex-shrink: 0;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--color-text-primary);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .main-content {
        padding: var(--spacing-md);
    }
    
    .toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }
    
    .toolbar-left,
    .toolbar-right {
        justify-content: space-between;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: var(--spacing-md);
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .stats-badge {
        padding: var(--spacing-xs) var(--spacing-md);
    }
    
    .orders-table th,
    .orders-table td {
        padding: var(--spacing-md);
        font-size: 0.8125rem;
    }
}