/**
 * ========================================
 * 威尔派官网 - 样式表
 * WELLPAI Official Website Stylesheet
 * ========================================
 * 
 * 目录：
 * 1. CSS变量定义
 * 2. 重置样式
 * 3. 通用样式
 * 4. 顶部提示栏
 * 5. 导航栏
 * 6. 主横幅轮播
 * 7. 产品展示区
 * 8. 关于我们（公司介绍）
 * 9. 研发实力/展会风采
 * 10. 合作服务
 * 11. 联系我们
 * 12. 页脚
 * 13. 返回顶部按钮
 * 14. 图片放大模态框
 * 15. 响应式设计
 * 16. 动画效果
 */

/* ========================================
   1. CSS变量定义
   ======================================== */
:root {
    /* 主色调 - 蓝色系（沿用DJI模板） */
    --color-primary: #0070D5;
    --color-primary-dark: #005BB5;
    --color-primary-light: #3399FF;
    
    /* 中性色 */
    --color-dark: #1E1E1E;
    --color-darker: #141414;
    --color-gray-900: #272727;
    --color-gray-700: #4A4A4A;
    --color-gray-500: #6C7073;
    --color-gray-300: #B0B0B0;
    --color-gray-100: #F5F5F5;
    --color-light: #F7F9FA;
    --color-white: #FFFFFF;
    --color-black: #000000;
    
    /* 文字颜色 */
    --color-text: rgba(0, 0, 0, 0.85);
    --color-text-secondary: rgba(0, 0, 0, 0.65);
    --color-text-muted: rgba(0, 0, 0, 0.45);
    --color-text-light: rgba(255, 255, 255, 0.85);
    --color-text-light-secondary: rgba(255, 255, 255, 0.65);
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    
    /* 字号 */
    --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;
    --font-size-5xl: 48px;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 80px;
    
    /* 布局 */
    --container-width: 1200px;
    --navbar-height: 64px;
    --border-radius: 8px;
    --border-radius-lg: 16px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}


/* ========================================
   2. 重置样式
   ======================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

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

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

ul, ol {
    list-style: none;
}

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

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

/* ========================================
   3. 通用样式
   ======================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 区块标题 */
.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.section-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    letter-spacing: 2px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 28px;
    border-radius: 100px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-base);
    cursor: pointer;
    white-space: nowrap;
}

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

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

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

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

.btn-large {
    padding: 16px 40px;
    font-size: var(--font-size-base);
}

/* 图片占位符 */
.image-placeholder,
.product-image-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    z-index: 0;
}

.image-placeholder.dark {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

.image-placeholder.large {
    font-size: var(--font-size-lg);
}

/* 图片加载后隐藏占位符 */
img:not([src=""]):not([src="undefined"]) + .image-placeholder,
img:not([src=""]):not([src="undefined"]) + .product-image-placeholder {
    display: none;
}


/* ========================================
   4. 顶部提示栏
   ======================================== */
.top-banner {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 10px 0;
    font-size: var(--font-size-sm);
    position: relative;
    z-index: 1001;
}

.top-banner .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.top-banner .promo-link {
    text-decoration: underline;
    font-weight: 500;
}

.top-banner .promo-link:hover {
    color: var(--color-white);
    opacity: 0.9;
}

.top-banner .close-btn {
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-white);
    font-size: 24px;
    line-height: 1;
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.top-banner .close-btn:hover {
    opacity: 1;
}

/* ========================================
   5. 导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all var(--transition-base);
}

/* 有顶部提示栏时的偏移 */
.top-banner + .navbar {
    top: 40px;
}

.top-banner.hidden + .navbar {
    top: 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.navbar .logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
}

.navbar .logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 2px;
}

.navbar .logo-subtitle {
    font-size: 10px;
    color: var(--color-text-light-secondary);
    letter-spacing: 1px;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-item {
    color: var(--color-text-light-secondary);
    font-size: 13px;
    font-weight: 400;
    padding: var(--spacing-sm) 0;
    position: relative;
    white-space: nowrap;
}

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

.nav-item:hover {
    color: var(--color-white);
}

.nav-item:hover::after {
    width: 100%;
}

/* 右侧操作区 */
.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.store-btn {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition-base);
}

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

/* 汉堡菜单按钮 */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 5px;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--color-white);
    transition: all var(--transition-base);
}

.hamburger-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端导航菜单 */
.mobile-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    padding: var(--spacing-lg);
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.mobile-nav.active {
    max-height: 500px;
}

.mobile-nav-item {
    color: var(--color-text-light-secondary);
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-nav-item:hover {
    color: var(--color-white);
}

.mobile-nav-item.store {
    color: var(--color-primary);
    font-weight: 500;
    border-bottom: none;
    margin-top: var(--spacing-sm);
}


/* ========================================
   6. 主横幅轮播
   ======================================== */
.hero-banner {
    position: relative;
    height: 100vh;
    min-height: 600px;
    max-height: 900px;
    overflow: hidden;
    margin-top: calc(var(--navbar-height) + 40px); /* 导航栏 + 顶部提示栏 */
}

.top-banner.hidden ~ .hero-banner {
    margin-top: var(--navbar-height);
}

.hero-slider-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slides {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.hero-slide.active {
    opacity: 1;
    visibility: visible;
}

.hero-slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-color: #1a1a2e; /* 占位背景色 */
}

/* 遮罩层已移除，动图直接显示 */

.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--color-white);
    padding: var(--spacing-2xl);
}

.hero-eyebrow {
    font-size: var(--font-size-base);
    color: var(--color-text-light-secondary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 2px;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -1px;
}

.hero-slogan {
    font-size: var(--font-size-xl);
    color: var(--color-text-light-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

/* 轮播指示器 */
.hero-indicators {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 10;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.3);
    border: 2px solid transparent;
    transition: all var(--transition-base);
}

.indicator:hover {
    background-color: rgba(255, 255, 255, 0.5);
}

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

/* 轮播进度条 */
.hero-progress {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.2);
    z-index: 10;
}

.progress-bar {
    height: 100%;
    background-color: var(--color-white);
    width: 0;
    transition: width 5s linear;
}

.progress-bar.active {
    width: 100%;
}


/* ========================================
   7. 产品展示区
   ======================================== */
.products-section {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

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

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    position: relative;
    width: 100%;
    padding-bottom: 100%; /* 1:1 比例 */
    overflow: hidden;
    background-color: var(--color-gray-100);
}

.product-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

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

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

.product-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    border-radius: 100px;
    margin-bottom: var(--spacing-sm);
}

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

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

.product-features {
    margin-bottom: var(--spacing-md);
}

.product-features li {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.product-link {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 500;
}

.product-link:hover {
    text-decoration: underline;
}

.products-cta {
    text-align: center;
}


/* ========================================
   8. 关于我们（公司介绍）
   ======================================== */
.about-section {
    background-color: var(--color-white);
}

/* 公司概况数据 */
.company-stats {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-darker) 100%);
    color: var(--color-white);
}

.company-stats .section-title {
    color: var(--color-white);
}

.company-stats .section-subtitle {
    color: var(--color-text-light-secondary);
}

.stats-grid {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4xl);
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 72px;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-unit {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-primary);
}

.stat-label {
    display: block;
    font-size: var(--font-size-base);
    color: var(--color-text-light-secondary);
    margin-top: var(--spacing-sm);
}

/* 核心优势 */
.core-advantages {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-lg);
}

.advantage-item {
    background-color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.advantage-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.advantage-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.advantage-content h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.advantage-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* 公司简介 */
.company-intro {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-white);
}

.company-intro .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.intro-content .section-title {
    text-align: left;
}

.intro-content .section-subtitle {
    text-align: left;
}

.intro-text p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.intro-text strong {
    color: var(--color-primary);
}

.intro-image {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    height: 400px;
}

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


/* 发展历程 */
.timeline-section {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-light);
}

.timeline {
    display: flex;
    justify-content: space-between;
    position: relative;
    padding-top: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: 2px;
}

.timeline-item {
    flex: 1;
    text-align: center;
    position: relative;
    padding: 0 var(--spacing-md);
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: -28px;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background-color: var(--color-primary);
    border: 4px solid var(--color-white);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.timeline-year {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.timeline-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* 全球制造基地 */
.manufacturing-section {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-white);
}

.manufacturing-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.location-info {
    margin-bottom: var(--spacing-xl);
}

.location-info h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.location-info p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.capacity-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.capacity-item {
    background-color: var(--color-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
}

.capacity-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

.capacity-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.factory-features h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.factory-features ul {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.factory-features li {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) 0;
}

/* 工厂图片画廊 */
.factory-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: 2fr 1fr;
    gap: var(--spacing-md);
    height: 100%;
}

.gallery-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--color-gray-100);
}

.gallery-item.main {
    grid-column: span 2;
}

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


/* ========================================
   9. 研发实力/展会风采（整张图片）
   ======================================== */
.rd-section,
.exhibition-section {
    position: relative;
    padding: var(--spacing-4xl) 0;
}

.rd-section {
    background-color: var(--color-light);
}

.exhibition-section {
    background-color: var(--color-darker);
}

.fullwidth-image-container {
    position: relative;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    overflow: hidden;
}

.fullwidth-image-container.dark-bg {
    background-color: transparent;
}

.fullwidth-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.mobile-zoom-hint {
    display: none;
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 100px;
    font-size: var(--font-size-sm);
}

/* ========================================
   10. 合作服务
   ======================================== */
.services-section {
    padding: var(--spacing-4xl) 0;
    background-color: var(--color-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.service-card {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-primary);
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.service-card > p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.service-features {
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.service-features li {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.service-features li::before {
    content: '•';
    position: absolute;
    left: var(--spacing-sm);
    color: var(--color-primary);
}

.service-link {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 500;
}

.service-link:hover {
    text-decoration: underline;
}


/* ========================================
   11. 联系我们
   ======================================== */
.contact-section {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-darker) 100%);
    color: var(--color-white);
}

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

.contact-section .section-subtitle {
    color: var(--color-text-light-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact-icon {
    font-size: var(--font-size-2xl);
    line-height: 1;
}

.contact-detail h3 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-light-secondary);
}

.contact-detail p {
    font-size: var(--font-size-base);
    color: var(--color-white);
}

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

.contact-detail a:hover {
    color: var(--color-primary-light);
}

.contact-cta {
    display: flex;
    justify-content: center;
}

.cta-card {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    max-width: 400px;
}

.cta-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.cta-card > p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-secondary);
    margin-bottom: var(--spacing-lg);
}

.cta-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-secondary);
    margin-top: var(--spacing-md);
}

.cta-note a {
    color: var(--color-primary-light);
}

/* ========================================
   12. 页脚
   ======================================== */
.footer {
    background-color: var(--color-darker);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 0;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    padding-right: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-md);
}

.footer-logo .logo-text {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: 2px;
}

.footer-logo .logo-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-secondary);
}

.footer-slogan {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-company {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
}

.footer-column h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.footer-column ul {
    margin-bottom: var(--spacing-lg);
}

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-secondary);
}

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

.contact-list li {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-store-btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
}

.footer-bottom a {
    color: var(--color-gray-500);
}

.footer-bottom a:hover {
    color: var(--color-text-light-secondary);
}


/* ========================================
   13. 返回顶部按钮
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

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

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* ========================================
   14. 图片放大模态框
   ======================================== */
.image-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

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

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
    position: relative;
    max-width: 95%;
    max-height: 95%;
    z-index: 1;
}

.modal-content img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    width: 40px;
    height: 40px;
    color: var(--color-white);
    font-size: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-fast);
}

.modal-close:hover {
    opacity: 0.7;
}


/* ========================================
   15. 响应式设计
   ======================================== */

/* 平板端 (768px - 1199px) */
@media (max-width: 1199px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger-btn {
        display: flex;
    }
    
    .mobile-nav {
        display: flex;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .company-intro .container {
        grid-template-columns: 1fr;
    }
    
    .intro-image {
        height: 300px;
    }
    
    .timeline {
        flex-wrap: wrap;
        gap: var(--spacing-lg);
    }
    
    .timeline::before {
        display: none;
    }
    
    .timeline-item {
        flex: 0 0 calc(50% - var(--spacing-md));
        text-align: left;
        padding-left: var(--spacing-2xl);
    }
    
    .timeline-item::before {
        top: 0;
        left: 0;
        transform: none;
    }
    
    .manufacturing-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-main {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 手机端 (<768px) */
@media (max-width: 767px) {
    :root {
        --font-size-3xl: 24px;
        --font-size-4xl: 32px;
        --font-size-5xl: 36px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    /* 顶部提示栏 */
    .top-banner {
        font-size: var(--font-size-xs);
        padding: var(--spacing-sm) 0;
    }
    
    .top-banner .close-btn {
        right: var(--spacing-sm);
    }
    
    /* 导航栏 */
    .navbar {
        height: 56px;
    }
    
    .top-banner + .navbar {
        top: 32px;
    }
    
    .store-btn {
        display: none;
    }
    
    /* 主横幅 */
    .hero-banner {
        min-height: 500px;
        margin-top: calc(56px + 32px);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-slogan {
        font-size: var(--font-size-base);
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        padding: 0 var(--spacing-xl);
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .hero-indicators {
        bottom: 60px;
    }
    
    .hero-progress {
        bottom: 40px;
        width: 150px;
    }
    
    /* 产品展示 */
    .products-section {
        padding: var(--spacing-2xl) 0;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .product-image {
        padding-bottom: 100%; /* 保持1:1比例 */
    }
    
    .product-info {
        padding: var(--spacing-md);
    }
    
    .product-features {
        display: none;
    }
    
    /* 公司概况 */
    .company-stats {
        padding: var(--spacing-2xl) 0;
    }
    
    .stats-grid {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .stat-number {
        font-size: 48px;
    }
    
    /* 核心优势 */
    .core-advantages {
        padding: var(--spacing-2xl) 0;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .advantage-item {
        display: flex;
        align-items: flex-start;
        gap: var(--spacing-md);
        padding: var(--spacing-lg);
    }
    
    .advantage-number {
        font-size: var(--font-size-xl);
        margin-bottom: 0;
    }
    
    /* 公司简介 */
    .company-intro {
        padding: var(--spacing-2xl) 0;
    }
    
    .intro-image {
        height: 250px;
    }
    
    /* 发展历程 */
    .timeline-section {
        padding: var(--spacing-2xl) 0;
    }
    
    .timeline-item {
        flex: 0 0 100%;
    }
    
    /* 全球制造基地 */
    .manufacturing-section {
        padding: var(--spacing-2xl) 0;
    }
    
    .capacity-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .factory-features ul {
        grid-template-columns: 1fr;
    }
    
    .factory-gallery {
        grid-template-rows: 1fr 1fr 1fr;
    }
    
    .gallery-item.main {
        grid-column: span 2;
    }
    
    /* 研发实力/展会风采 - 手机端点击放大 */
    .fullwidth-image-container {
        cursor: pointer;
    }
    
    .mobile-zoom-hint {
        display: block;
    }
    
    /* 合作服务 */
    .services-section {
        padding: var(--spacing-2xl) 0;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    /* 联系我们 */
    .contact-section {
        padding: var(--spacing-2xl) 0;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .cta-card {
        padding: var(--spacing-lg);
    }
    
    /* 页脚 */
    .footer {
        padding: var(--spacing-2xl) 0 0;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-brand {
        padding-right: 0;
        text-align: center;
    }
    
    .footer-column {
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    /* 返回顶部按钮 */
    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 40px;
        height: 40px;
    }
}

/* 超小屏幕 (<480px) */
@media (max-width: 479px) {
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .product-image {
        padding-bottom: 100%; /* 保持1:1比例 */
    }
    
    .product-features {
        display: block;
    }
}


/* ========================================
   16. 动画效果
   ======================================== */

/* 淡入上移动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 淡入动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 缩放动画 */
@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 滚动触发动画的初始状态 */
[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos="fade-right"] {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-right"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}

[data-aos="fade-left"] {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="fade-left"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}

[data-aos="zoom-in"] {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos="zoom-in"].aos-animate {
    opacity: 1;
    transform: scale(1);
}

/* 延迟动画 */
[data-aos-delay="100"] {
    transition-delay: 0.1s;
}

[data-aos-delay="200"] {
    transition-delay: 0.2s;
}

[data-aos-delay="300"] {
    transition-delay: 0.3s;
}

[data-aos-delay="400"] {
    transition-delay: 0.4s;
}

/* 减少动画（用户偏好设置） */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}