/**
 * 主样式文件
 * 企业外贸网站 - 毛线产品销售
 */

/* ==========================================
   CSS Variables
   ========================================== */
:root {
    /* Colors */
    --primary-color: #2c5f2d;
    --primary-dark: #1e4420;
    --primary-light: #3d7a3e;
    --secondary-color: #97bc62;
    --accent-color: #d4a373;
    
    /* Neutrals */
    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #eeeeee;
    --gray-300: #e0e0e0;
    --gray-400: #bdbdbd;
    --gray-500: #9e9e9e;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
    --black: #000000;
    
    /* Text Colors */
    --text-primary: #212121;
    --text-secondary: #666666;
    --text-muted: #999999;
    --text-light: #ffffff;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #1a1a1a;
    
    /* Border */
    --border-color: #e0e0e0;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Typography */
    --font-family: 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 40px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Container - 自适应宽度 */
    --container-max-width: 1920px;
    --container-padding: 20px;
}

/* ==========================================
   Reset & Base Styles
   ========================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ==========================================
   Layout - 自适应容器
   ========================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-2xl) 0;
}

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.view-all {
    color: var(--primary-color);
    font-weight: 500;
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

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

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ==========================================
   Header
   ========================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.site-logo a {
    display: flex;
    align-items: center;
}

.site-logo img,
.site-logo .logo-image {
    height: 40px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 500;
    color: var(--text-primary);
    padding: var(--spacing-sm) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Search Box */
.search-box {
    margin-inline-start: var(--spacing-lg) !important;
    flex: 0 0 auto !important;
    max-width: 300px !important;
    min-width: 150px !important;
}

.search-form {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background-color: var(--gray-100);
    border-radius: var(--border-radius);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: background-color var(--transition-fast);
    width: 100%;
}

.search-form:focus-within {
    background-color: var(--white);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.search-input {
    flex: 1;
    min-width: 0;
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    background: transparent;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    outline: none;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs);
    color: var(--text-muted);
    transition: color var(--transition-fast);
    background: transparent;
    border: none;
    cursor: pointer;
    flex-shrink: 0;
}

.search-button:hover {
    color: var(--primary-color);
}

.search-button svg {
    width: 16px;
    height: 16px;
}

/* Mobile Responsive - Search Box */
@media (max-width: 768px) {
    .search-box {
        margin-inline-start: 8px !important;
        flex: 0 0 auto !important;
        max-width: 90px !important;
        min-width: 70px !important;
    }
    
    .search-form {
        padding: 3px 6px !important;
        background-color: transparent !important;
    }
    
    .search-input {
        font-size: 11px !important;
        padding: 2px 4px !important;
        min-width: 0 !important;
    }
    
    .search-input::placeholder {
        font-size: 9px !important;
    }
    
    .search-button {
        padding: 2px !important;
    }
    
    .search-button svg {
        width: 12px !important;
        height: 12px !important;
    }
}

/* Extra Small Mobile */
@media (max-width: 375px) {
    .search-box {
        margin-inline-start: 4px !important;
        max-width: 70px !important;
        min-width: 60px !important;
    }
    
    .search-form {
        padding: 2px 4px !important;
    }
    
    .search-input {
        padding: 2px 3px !important;
        font-size: 10px !important;
    }
    
    .search-input::placeholder {
        font-size: 8px !important;
    }
    
    .search-button svg {
        width: 10px !important;
        height: 10px !important;
    }
}

/* Language Selector */
.language-selector,
.header-language {
    position: relative;
    margin-inline-start: var(--spacing-xl);
}

.language-current {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--gray-100);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.language-current:hover {
    background-color: var(--gray-200);
}

.lang-flag {
    font-size: 1.2em;
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    max-height: 300px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 9999;
}

[dir="rtl"] .language-dropdown {
    right: auto;
    left: 0;
}

.language-selector:hover .language-dropdown,
.language-selector.open .language-dropdown,
.header-language:hover .language-dropdown,
.header-language.open .language-dropdown,
.mobile-language-selector:hover .language-dropdown,
.mobile-language-selector.open .language-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

.language-option a:hover {
    background-color: var(--gray-50);
}

.language-option.active a {
    color: var(--primary-color);
    font-weight: 500;
}

.language-dropdown::-webkit-scrollbar {
    width: 6px;
}

.language-dropdown::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 3px;
}

.language-dropdown::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 3px;
}

.language-dropdown::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    width: 30px;
    height: 24px;
    position: relative;
}

.hamburger,
.hamburger::before,
.hamburger::after {
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-base);
}

.hamburger {
    top: 50%;
    transform: translateY(-50%);
}

.hamburger::before {
    content: '';
    top: -8px;
}

.hamburger::after {
    content: '';
    top: 8px;
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--white);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav-list a {
    display: block;
    padding: var(--spacing-md);
    font-weight: 500;
}

.mobile-language {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
}

.mobile-language-selector {
    position: relative;
}

.mobile-language-selector .language-dropdown {
    z-index: 9999;
}

[dir="rtl"] .mobile-language-selector .language-dropdown {
    right: auto;
    left: 0;
}

/* ==========================================
   Hero Banner
   ========================================== */
.hero-banner {
    margin-top: 70px;
    min-height: 500px;
    position: relative;
    background-color: var(--primary-color);
}

.banner-slide,
.banner-default {
    height: 500px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    position: relative;
}

.banner-default {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, #1a3a1b 100%);
}

.banner-default::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.banner-slide::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, rgba(0,0,0,0.7), transparent);
}

.banner-content {
    position: relative;
    z-index: 1;
    color: var(--white);
    max-width: 600px;
    padding: var(--spacing-2xl);
}

.banner-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.banner-subtitle {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    opacity: 1;
}

.banner-tagline {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

/* ==========================================
   Products Grid - 自适应列数
   ========================================== */

/* Products Notice */
.products-notice {
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(44, 95, 45, 0.05) 0%, rgba(151, 188, 98, 0.05) 100%);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(44, 95, 45, 0.08);
    transition: all var(--transition-base);
}

.products-notice::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(151, 188, 98, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(50%, -50%);
    pointer-events: none;
}

.products-notice:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(44, 95, 45, 0.12);
}

.notice-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

.notice-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(44, 95, 45, 0.2);
}

.notice-icon svg {
    width: 20px;
    height: 20px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.notice-content span {
    flex: 1;
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.6;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(44, 95, 45, 0.08);
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.contact-link:hover {
    color: var(--white);
    background: var(--primary-color);
    box-shadow: 0 4px 12px rgba(44, 95, 45, 0.25);
    transform: translateY(-1px);
}

.contact-link::after {
    content: '→';
    font-size: var(--font-size-sm);
    transition: transform var(--transition-base);
}

.contact-link:hover::after {
    transform: translateX(4px);
}

/* 移动端适配 */
@media (max-width: 768px) {
    .products-notice {
        padding: var(--spacing-md);
        border-radius: var(--border-radius-md);
        margin-bottom: var(--spacing-lg);
    }
    
    .notice-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
        text-align: left;
    }
    
    .notice-icon {
        width: 36px;
        height: 36px;
        border-radius: 8px;
    }
    
    .notice-icon svg {
        width: 18px;
        height: 18px;
    }
    
    .notice-content span {
        font-size: var(--font-size-sm);
        line-height: 1.5;
    }
    
    .contact-link {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}

@media (max-width: 480px) {
    .products-notice {
        padding: var(--spacing-sm);
    }
    
    .notice-icon {
        width: 32px;
        height: 32px;
    }
    
    .notice-icon svg {
        width: 16px;
        height: 16px;
    }
    
    .notice-content span {
        font-size: var(--font-size-xs);
    }
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.product-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    background-color: var(--gray-100);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-info {
    padding: var(--spacing-md);
}

.product-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.product-name a {
    color: var(--text-primary);
}

.product-name a:hover {
    color: var(--primary-color);
}

.product-summary {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.product-price {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* ==========================================
   Articles Grid - 自适应列数
   ========================================== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.article-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.article-image {
    aspect-ratio: 16/9;
    overflow: hidden;
    background-color: var(--gray-100);
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-info {
    padding: var(--spacing-md);
}

.article-date {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.article-title {
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-xs);
}

.article-title a {
    color: var(--text-primary);
}

.article-title a:hover {
    color: var(--primary-color);
}

.article-summary {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

.read-more {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.article-detail .article-thumbnail {
    margin: var(--spacing-xl) 0;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    background-color: var(--gray-100);
}

.article-detail .article-thumbnail img {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    display: block;
}

.article-detail .article-content {
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--text-primary);
}

.article-detail .article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-md);
    margin: var(--spacing-md) 0;
}

.article-detail .article-content p {
    margin-bottom: var(--spacing-md);
}

.article-detail .article-content h2,
.article-detail .article-content h3,
.article-detail .article-content h4 {
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

/* ==========================================
   Advantages - 自适应列数
   ========================================== */
.advantages {
    background-color: var(--bg-secondary);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.advantage-item {
    text-align: center;
    padding: var(--spacing-xl);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

.advantage-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.advantage-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.advantage-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==========================================
   Contact CTA
   ========================================== */
.contact-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    text-align: center;
}

.cta-title {
    color: var(--white);
}

.cta-desc {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

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

.contact-cta .btn-primary:hover {
    background-color: var(--gray-100);
}

/* ==========================================
   Footer - 自适应列数
   ========================================== */
.site-footer {
    background-color: var(--bg-dark);
    color: var(--white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-grid > :first-child {
    flex: 2;
}

.footer-title {
    font-size: var(--font-size-lg);
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: var(--gray-400);
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--gray-400);
}

.footer-links a:hover {
    color: var(--white);
}

.contact-info li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--gray-400);
    margin-bottom: var(--spacing-sm);
}

.contact-info a {
    color: var(--gray-400);
}

.contact-info a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

/* ==========================================
   Breadcrumb
   ========================================== */
.breadcrumb {
    margin-top: 70px;
    padding: var(--spacing-md) 0;
    background-color: var(--bg-secondary);
}

.breadcrumb ol {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.breadcrumb li {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.breadcrumb li::after {
    content: '/';
    margin-left: var(--spacing-sm);
    color: var(--gray-400);
}

.breadcrumb li:last-child::after {
    display: none;
}

.breadcrumb li.active {
    color: var(--primary-color);
    font-weight: 500;
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb a:hover {
    color: var(--primary-color);
}

/* ==========================================
   Product Detail
   ========================================== */
.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.product-images .main-image {
    aspect-ratio: 1;
    background-color: var(--gray-100);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.product-images .main-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.image-thumbnails {
    display: flex;
    gap: var(--spacing-sm);
}

.thumbnail {
    width: 80px;
    height: 80px;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity var(--transition-fast);
    border: 2px solid transparent;
}

.thumbnail.active,
.thumbnail:hover {
    opacity: 1;
    border-color: var(--primary-color);
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.product-sku {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.product-summary {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
}

.inquiry-form {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
}

.inquiry-form h3 {
    margin-bottom: var(--spacing-md);
}

.product-tabs {
    margin-top: var(--spacing-xl);
}

.tab-nav {
    display: flex;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition-fast);
}

.tab-btn.active,
.tab-btn:hover {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-pane {
    display: none;
}

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

.contact-info-box {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1a3a1b 100%);
    color: #fff;
    padding: 30px;
    border-radius: var(--border-radius-lg);
    margin-top: var(--spacing-lg);
    text-align: center;
}

.contact-info-box h3 {
    color: #fff;
    font-size: 20px;
    margin-bottom: 15px;
}

.contact-info-box p {
    font-size: 15px;
    margin-bottom: 10px;
    opacity: 0.95;
}

.contact-info-box .contact-email {
    font-size: 16px;
    margin-bottom: 20px;
}

.contact-info-box .contact-email a {
    color: #fff;
    font-weight: 500;
}

.contact-info-box .contact-email a:hover {
    text-decoration: underline;
}

.contact-info-box .btn {
    background: #fff;
    color: var(--primary-color);
    border: none;
    font-weight: 600;
}

.contact-info-box .btn:hover {
    background: var(--gray-100);
}

/* ==========================================
   Forms
   ========================================== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

/* ==========================================
   Pagination
   ========================================== */
.pagination {
    margin-top: var(--spacing-xl);
}

.pagination-list {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.pagination-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.pagination-item.ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
}

/* ==========================================
   Back to Top
   ========================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-4px);
}

/* ==========================================
   Alerts
   ========================================== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* ==========================================
   Badges
   ========================================== */
.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: 4px;
}

.badge-featured {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background-color: var(--accent-color);
    color: var(--white);
}

.badge-success {
    background-color: #d4edda;
    color: #155724;
}

.badge-warning {
    background-color: #fff3cd;
    color: #856404;
}

.badge-default {
    background-color: var(--gray-200);
    color: var(--text-secondary);
}

/* ==========================================
   No Data
   ========================================== */
.no-data {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

/* ==========================================
   Responsive Design - 自适应断点
   ========================================== */

/* 平板 */
@media (max-width: 1024px) {
    :root {
        --container-max-width: 960px;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .articles-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        max-width: 100%;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: var(--spacing-lg);
        max-width: 100%;
    }
}

/* 移动端 */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 28px;
        --font-size-2xl: 22px;
        --font-size-xl: 18px;
        --container-max-width: 100%;
        --container-padding: 16px;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .header-language {
        display: block;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: var(--spacing-md);
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
        max-width: 100%;
    }
    
    .advantage-item {
        padding: var(--spacing-md);
        min-height: auto;
    }
    
    .advantage-icon {
        font-size: 40px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .product-detail-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .banner-title {
        font-size: var(--font-size-2xl);
    }
    
    .banner-subtitle {
        font-size: var(--font-size-2xl);
    }
    
    .banner-slide,
    .banner-default {
        height: 400px;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    :root {
        --container-padding: 12px;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .product-image {
        aspect-ratio: 1;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
}

/* 超大屏幕 - 2K及以上 */
@media (min-width: 2560px) {
    :root {
        --font-size-base: 18px;
        --font-size-lg: 20px;
        --font-size-xl: 22px;
        --font-size-2xl: 28px;
        --font-size-3xl: 36px;
        --font-size-4xl: 44px;
        --container-padding: 40px;
    }
    
    /* 导航栏优化 */
    .header-inner {
        height: 90px;
    }
    
    .site-logo img,
    .site-logo .logo-image {
        height: 52px;
        max-width: 280px;
    }
    
    .nav-list {
        gap: 48px;
    }
    
    .nav-link {
        font-size: 18px;
        padding: 10px 0;
    }
    
    .logo-text {
        font-size: 24px;
    }
    
    .language-current {
        padding: 10px 16px;
        font-size: 15px;
    }
    
    /* 英雄横幅调整 */
    .hero-banner {
        margin-top: 90px;
    }
    
    .breadcrumb {
        margin-top: 90px;
    }
    
    .advantages-grid {
        gap: 48px;
    }
    
    .articles-grid {
        grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
        max-width: 1600px;
    }
}

/* 2K屏幕 */
@media (min-width: 1920px) and (max-width: 2559px) {
    :root {
        --font-size-base: 17px;
        --container-padding: 30px;
    }
    
    /* 导航栏优化 */
    .header-inner {
        height: 80px;
    }
    
    .site-logo img,
    .site-logo .logo-image {
        height: 48px;
        max-width: 240px;
    }
    
    .nav-list {
        gap: 40px;
    }
    
    .nav-link {
        font-size: 17px;
        padding: 8px 0;
    }
    
    .logo-text {
        font-size: 22px;
    }
    
    .language-current {
        padding: 8px 14px;
        font-size: 14px;
    }
    
    /* 英雄横幅调整 */
    .hero-banner {
        margin-top: 80px;
    }
    
    .breadcrumb {
        margin-top: 80px;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: 40px;
    }
    
    .articles-grid {
        grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
        max-width: 1500px;
    }
}

/* ==========================================
   Utility Classes
   ========================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* ==========================================
   首页网格限制和查看更多按钮
   ========================================== */

/* 文章网格基础样式 - 固定列数，确保两行显示 */
.articles-grid.limited {
    display: grid;
    gap: var(--spacing-lg);
    /* 默认4列，会在媒体查询中覆盖 */
}

/* 产品网格基础样式 - 固定列数，确保两行显示 */
.products-grid.limited {
    display: grid;
    gap: var(--spacing-lg);
    /* 默认4列，会在媒体查询中覆盖 */
}

/* 1280px - 1919px（包括1080p） */
@media (min-width: 1280px) and (max-width: 1919px) {
    /* 文章网格：3列，显示6篇文章（两行） */
    .articles-grid.limited {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1100px;
        margin: 0 auto;
    }
    
    .articles-grid.limited .article-card:nth-child(n+7) {
        display: none;
    }
    
    /* 产品网格：4列，显示8个产品（两行） */
    .products-grid.limited {
        grid-template-columns: repeat(4, 1fr);
        max-width: 1400px;
        margin: 0 auto;
    }
    
    .products-grid.limited .product-card:nth-child(n+9) {
        display: none;
    }
}

/* 1920px - 2559px（2K） */
@media (min-width: 1920px) and (max-width: 2559px) {
    /* 文章网格：4列，显示8篇文章（两行） */
    .articles-grid.limited {
        grid-template-columns: repeat(4, 1fr);
        max-width: 1500px;
        margin: 0 auto;
    }
    
    .articles-grid.limited .article-card:nth-child(n+9) {
        display: none;
    }
    
    /* 产品网格：6列，显示12个产品（两行） */
    .products-grid.limited {
        grid-template-columns: repeat(6, 1fr);
        max-width: 1800px;
        margin: 0 auto;
    }
    
    .products-grid.limited .product-card:nth-child(n+13) {
        display: none;
    }
}

/* 2560px及以上（4K） */
@media (min-width: 2560px) {
    /* 文章网格：5列，显示10篇文章（两行） */
    .articles-grid.limited {
        grid-template-columns: repeat(5, 1fr);
        max-width: 1800px;
        margin: 0 auto;
    }
    
    .articles-grid.limited .article-card:nth-child(n+11) {
        display: none;
    }
    
    /* 产品网格：7列，显示14个产品（两行） */
    .products-grid.limited {
        grid-template-columns: repeat(7, 1fr);
        max-width: 2000px;
        margin: 0 auto;
    }
    
    .products-grid.limited .product-card:nth-child(n+15) {
        display: none;
    }
}

/* 1024px - 1279px */
@media (min-width: 1024px) and (max-width: 1279px) {
    /* 文章网格：3列，显示6篇文章（两行） */
    .articles-grid.limited {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1000px;
        margin: 0 auto;
    }
    
    .articles-grid.limited .article-card:nth-child(n+7) {
        display: none;
    }
    
    /* 产品网格：3列，显示6个产品（两行） */
    .products-grid.limited {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1100px;
        margin: 0 auto;
    }
    
    .products-grid.limited .product-card:nth-child(n+7) {
        display: none;
    }
}

/* 移动端和平板 - 限制显示数量 */
@media (max-width: 1023px) {
    /* 产品网格 - 限制8个 */
    .products-grid .product-card:nth-child(n+9) {
        display: none;
    }
    
    /* 文章网格 - 限制6个 */
    .articles-grid .article-card:nth-child(n+7) {
        display: none;
    }
}

/* 查看更多按钮容器 */
.view-more-container {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* 查看更多按钮样式 */
.view-more-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--primary-color);
    background-color: transparent;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    cursor: pointer;
}

.view-more-btn:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.view-more-btn .arrow {
    margin-left: var(--spacing-sm);
    transition: transform var(--transition-base);
}

.view-more-btn:hover .arrow {
    transform: translateX(4px);
}

/* ==========================================
   Products Notice Box - 产品提示框
   ========================================== */
.products-notice-box {
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(44, 95, 45, 0.08) 0%, rgba(151, 188, 98, 0.08) 100%);
    border: 2px solid rgba(44, 95, 45, 0.2);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(44, 95, 45, 0.1);
    transition: all var(--transition-base);
}

.products-notice-box::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(151, 188, 98, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.products-notice-box:hover {
    box-shadow: 0 8px 30px rgba(44, 95, 45, 0.15);
    border-color: rgba(44, 95, 45, 0.3);
}

.notice-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
}

.notice-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(44, 95, 45, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 4px 12px rgba(44, 95, 45, 0.3);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 6px 16px rgba(44, 95, 45, 0.4);
    }
}

.notice-text {
    flex: 1;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    font-weight: 500;
    min-width: 200px;
}

.notice-btn {
    flex-shrink: 0;
    padding: var(--spacing-sm) var(--spacing-xl);
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(44, 95, 45, 0.25);
    transition: all var(--transition-base);
}

.notice-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(44, 95, 45, 0.35);
}

/* 平板设备 */
@media (max-width: 992px) {
    .products-notice-box {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .notice-icon {
        width: 45px;
        height: 45px;
        font-size: 22px;
    }

    .notice-text {
        font-size: var(--font-size-sm);
    }

    .notice-btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
}

/* 移动端 */
@media (max-width: 768px) {
    .products-notice-box {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }

    .notice-content {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }

    .notice-icon {
        width: 40px;
        height: 40px;
        font-size: 20px;
        align-self: flex-start;
    }

    .notice-text {
        font-size: var(--font-size-base);
        line-height: 1.6;
        flex: 1;
    }

    .notice-btn {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
        text-align: center;
        font-size: var(--font-size-base);
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    .products-notice-box {
        padding: var(--spacing-sm);
        border-radius: var(--border-radius);
    }

    .notice-icon {
        width: 36px;
        height: 36px;
        font-size: 18px;
        border-radius: 8px;
    }

    .notice-text {
        font-size: var(--font-size-sm);
        line-height: 1.5;
    }

    .notice-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}