/**
 * 采购顾问系统 - 样式表
 * Purchase Advisor System - Stylesheet
 * 风格：专业、简洁、工业化
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Colors */
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;

    /* Alert Colors */
    --color-critical: #dc2626;
    --color-critical-bg: #fef2f2;
    --color-urgent: #ea580c;
    --color-urgent-bg: #fff7ed;
    --color-warning: #f59e0b;
    --color-warning-bg: #fffbeb;
    --color-attention: #3b82f6;
    --color-attention-bg: #eff6ff;
    --color-normal: #22c55e;
    --color-normal-bg: #f0fdf4;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ============================================
   Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 14px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

/* ============================================
   Layout
   ============================================ */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

.logo-icon {
    font-size: 1.5rem;
}

/* Search */
.search-box {
    flex: 1;
    max-width: 400px;
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background: var(--color-bg);
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--color-attention);
    background: var(--color-surface);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

/* Search Results Dropdown */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 200;
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-bottom: 1px solid var(--color-border);
    transition: background 0.15s;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background: var(--color-bg);
}

.search-result-sku {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.875rem;
}

.search-result-name {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sync-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-text);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.sync-btn:hover {
    background: #334155;
}

.sync-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.sync-btn.syncing .sync-icon {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

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

/* ============================================
   Stats Cards
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    transition: all 0.2s;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
}

.stat-card.critical {
    border-left: 4px solid var(--color-critical);
    background: var(--color-critical-bg);
}

.stat-card.urgent {
    border-left: 4px solid var(--color-urgent);
    background: var(--color-urgent-bg);
}

.stat-card.warning {
    border-left: 4px solid var(--color-warning);
    background: var(--color-warning-bg);
}

.stat-card.attention {
    border-left: 4px solid var(--color-attention);
    background: var(--color-attention-bg);
}

.stat-card.normal {
    border-left: 4px solid var(--color-normal);
    background: var(--color-normal-bg);
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.stat-card.critical .stat-value {
    color: var(--color-critical);
}

.stat-card.urgent .stat-value {
    color: var(--color-urgent);
}

.stat-card.warning .stat-value {
    color: var(--color-warning);
}

.stat-card.attention .stat-value {
    color: var(--color-attention);
}

.stat-card.normal .stat-value {
    color: var(--color-normal);
}

/* ============================================
   Data Table
   ============================================ */
.table-container {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.table-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

.table-title {
    font-weight: 600;
    font-size: 1rem;
}

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
    border: 1px solid var(--color-border);
}

.data-table th,
.data-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center !important;
    vertical-align: middle;
    border: 1px solid var(--color-border);
    overflow: hidden;
    text-overflow: ellipsis;
}

.data-table th {
    background: var(--color-bg);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

/* 固定列宽 */
.data-table th:nth-child(1),
.data-table td:nth-child(1) {
    width: 100px;
}

/* SKU */

.data-table th:nth-child(2) {
    width: 22%;
    text-align: left !important;
}

/* 产品名称标题 - 左对齐 */
.data-table td:nth-child(2) {
    width: 22%;
    text-align: left !important;
}

/* 产品名称内容 - 左对齐 */

.data-table th:nth-child(3),
.data-table td:nth-child(3) {
    width: 70px;
}

/* 德国库存 */

.data-table th:nth-child(4),
.data-table td:nth-child(4) {
    width: 60px;
}

/* 在途 */

.data-table th:nth-child(5),
.data-table td:nth-child(5) {
    width: 70px;
}

/* 30天销量 */

.data-table th:nth-child(6),
.data-table td:nth-child(6) {
    width: 60px;
}

/* 日均 */

.data-table th:nth-child(7),
.data-table td:nth-child(7) {
    width: 70px;
}

/* 可售天数 */

.data-table th:nth-child(8),
.data-table td:nth-child(8) {
    width: 90px;
}

/* 状态 */

.data-table th:nth-child(9),
.data-table td:nth-child(9) {
    width: 70px;
}

/* 建议采购 */

.data-table th:nth-child(10),
.data-table td:nth-child(10) {
    width: 80px;
}

/* 运输方式 */

.data-table tbody tr {
    transition: background 0.15s;
    cursor: pointer;
}

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

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Table Cell Styles */
.cell-sku {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.875rem;
}

.cell-name {
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.cell-number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.cell-days {
    font-family: var(--font-mono);
    font-weight: 600;
}

/* Alert Badge */
.alert-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
}

.alert-badge.critical {
    background: var(--color-critical-bg);
    color: var(--color-critical);
}

.alert-badge.urgent {
    background: var(--color-urgent-bg);
    color: var(--color-urgent);
}

.alert-badge.warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.alert-badge.attention {
    background: var(--color-attention-bg);
    color: var(--color-attention);
}

.alert-badge.normal {
    background: var(--color-normal-bg);
    color: var(--color-normal);
}

/* Shipping Badge */
.shipping-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.2s;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all 0.15s;
}

.modal-close:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

/* Detail Sections */
.detail-section {
    margin-bottom: var(--spacing-xl);
}

.detail-section:last-child {
    margin-bottom: 0;
}

.detail-section-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

/* Stock Overview Grid */
.stock-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
}

.stock-item {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.stock-item-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.stock-item-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
}

/* Transit List */
.transit-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.transit-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.transit-icon {
    font-size: 1.5rem;
}

.transit-info {
    flex: 1;
}

.transit-mode {
    font-weight: 600;
    font-size: 0.875rem;
}

.transit-meta {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.transit-quantity {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1rem;
}

.transit-days {
    text-align: right;
}

.transit-days-value {
    font-family: var(--font-mono);
    font-weight: 600;
}

.transit-days-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Shipping Options */
.shipping-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
}

.shipping-option {
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    transition: all 0.2s;
}

.shipping-option.recommended {
    border-color: var(--color-normal);
    background: var(--color-normal-bg);
}

.shipping-option.unavailable {
    opacity: 1;
    border-color: #ddd;
    color: #999;
}

.shipping-option-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.shipping-option-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.shipping-option-days {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.shipping-option-status {
    font-size: 0.75rem;
    margin-top: var(--spacing-sm);
    padding: 2px 8px;
    border-radius: 9999px;
    display: inline-block;
}

.shipping-option.recommended .shipping-option-status {
    background: var(--color-normal);
    color: white;
}

.shipping-option.unavailable .shipping-option-status {
    background: var(--color-critical-bg);
    color: var(--color-critical);
}

/* Purchase Advice Box */
.advice-box {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.advice-item {
    text-align: center;
}

.advice-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.advice-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.advice-value.critical {
    color: var(--color-critical);
}

.advice-value.urgent {
    color: var(--color-urgent);
}

.advice-value.warning {
    color: var(--color-warning);
}

/* ============================================
   Loading & Empty States
   ============================================ */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) * 2;
    color: var(--color-text-muted);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-attention);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: var(--spacing-md);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl) * 2;
    color: var(--color-text-muted);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--color-text);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
}

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

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

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

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .header-content {
        flex-wrap: wrap;
    }

    .search-box {
        order: 3;
        max-width: none;
        width: 100%;
        margin-top: var(--spacing-md);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .modal {
        width: 95%;
        max-height: 95vh;
    }
}

/* ============================================
   Product Detail Page
   ============================================ */
.page-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.back-btn:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

.page-title-section {
    flex: 1;
}

.page-title-section h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.page-title-section p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.detail-container {
    background: #ffffff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
}

.error-container {
    text-align: center;
    padding: 60px 20px;
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.error-message {
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}