/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #E60012;
    --primary-dark: #B8000E;
    --secondary-color: #FF4D4D;
    --accent-color: #FFD700;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
    position: relative; /* 为语言切换器绝对定位做准备 */
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo {
    height: 40px;
    width: auto;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin-left: auto; /* 推到右侧 */
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
}

.nav-link:hover {
    color: var(--secondary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><circle cx="200" cy="200" r="100" fill="rgba(255,255,255,0.1)"/><circle cx="800" cy="400" r="150" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.btn-outline {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid var(--white);
    background: transparent;
    color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--white);
    opacity: 0.8;
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--white);
    border-bottom: 2px solid var(--white);
    transform: rotate(45deg);
    margin: 0 auto;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 4rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-download {
    background: var(--secondary-color);
    color: var(--white);
    width: 100%;
}

.btn-download:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Section 通用样式 */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    margin: 15px auto 0;
    border-radius: 2px;
}

/* 首页特色区域 */
.features-section {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.learn-more {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.learn-more:hover {
    color: var(--primary-color);
}

/* 新闻区域 */
.news-section {
    background: var(--white);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.news-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-badge {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.news-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-size: 1.2rem;
}

.news-date {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.news-card > p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.btn-small {
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* 快速链接 */
.quick-links-section {
    background: var(--bg-light);
}

.quick-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.quick-link-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.3s ease;
}

.quick-link-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.quick-link-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.quick-link-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.quick-link-card p {
    color: var(--text-light);
}

/* 页面标题 */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 120px 0 60px;
    text-align: center;
    position: relative;
}

.page-header-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><circle cx="200" cy="200" r="100" fill="rgba(255,255,255,0.1)"/><circle cx="800" cy="400" r="150" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.3;
}

.page-header .container {
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.breadcrumb {
    font-size: 1rem;
    opacity: 0.9;
}

.breadcrumb a {
    color: var(--white);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* 关于鸿利达页面 */
.about-intro-section {
    background: var(--white);
}

/* 关于页面 - 左右双栏布局优化 */
.about-intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-intro-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    line-height: 1.3;
}

.lead-text {
    font-size: 1.15rem;
    line-height: 1.9;
    color: var(--text-dark);
    margin-bottom: 1.2rem;
    font-weight: 500;
}

.about-intro-text p {
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.company-values {
    margin-top: 2.5rem;
}

.company-values h3 {
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.value-item {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}

.value-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.value-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.value-item h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.value-item p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 视频容器 - PC端sticky定位 */
.about-intro-video {
    position: relative;
}

.about-intro-video .video-wrapper {
    position: sticky;
    top: 100px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 16/9;
}

/* 时间线 */
.timeline-section {
    background: var(--bg-light);
}

.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--primary-color);
}

.timeline-item {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 4px solid var(--white);
    box-shadow: var(--shadow);
    z-index: 1;
}

.timeline-content {
    width: 45%;
    background: var(--white);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: auto;
    margin-left: 0;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
    margin-right: 0;
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-light);
}

/* 团队优势 */
.team-section {
    background: var(--white);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.team-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}

.team-card:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-10px);
}

.team-card:hover h3,
.team-card:hover p {
    color: var(--white);
}

.team-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--secondary-color);
    opacity: 0.5;
    margin-bottom: 1rem;
}

.team-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.team-card p {
    color: var(--text-light);
}

/* ARES介绍页面 */
.ares-detail-section {
    background: var(--white);
}

/* ARES介绍页面 - 左右双栏布局优化 */
.ares-detail-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: start;
}

.ares-detail-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    line-height: 1.3;
}

.ares-advantages {
    margin-top: 2.5rem;
}

.ares-advantages h3 {
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.advantage-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.advantage-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.advantage-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow);
}

.advantage-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.advantage-content h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.advantage-content p {
    color: var(--text-light);
    line-height: 1.6;
}

/* ARES视频容器 - PC端sticky定位 */
.ares-videos-container {
    position: sticky;
    top: 100px;
}

.ares-videos-container h3 {
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.video-card-large {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.video-card-large h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    text-align: center;
    font-size: 1.1rem;
}

.video-card-large .video-wrapper {
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 16/9;
}

/* 功能特性 */
.features-detail-section {
    background: var(--bg-light);
}

.features-detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-detail-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.feature-detail-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-detail-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-detail-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.feature-detail-card p {
    color: var(--text-light);
}

/* 合作页面 */
.cooperation-detail-section {
    background: var(--white);
}

/* 合作页面 - 左右双栏布局优化 */
.cooperation-detail-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

/* 合作视频容器 - PC端sticky定位 */
.cooperation-video-container {
    position: relative;
}

.cooperation-video-container .video-wrapper {
    position: sticky;
    top: 100px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.cooperation-detail-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    line-height: 1.3;
}

.cooperation-highlights {
    margin-top: 2rem;
}

.cooperation-highlights h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.highlight-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 8px;
}

.highlight-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: bold;
}

.highlight-content h4 {
    margin-bottom: 0.3rem;
    color: var(--text-dark);
}

.highlight-content p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 合作意义 */
.cooperation-significance-section {
    background: var(--bg-light);
}

.significance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.significance-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.significance-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.significance-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.3;
    margin-bottom: 1rem;
}

.significance-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.significance-card p {
    color: var(--text-light);
}

/* 模式页面 */
.model-intro-section {
    background: var(--white);
}

/* 模式页面 - 左右双栏布局优化 */
.model-intro-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: start;
}

.model-intro-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    line-height: 1.3;
}

.model-principles {
    margin-top: 2.5rem;
}

.model-principles h3 {
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.principles-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.principle-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.principle-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow);
}

.principle-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.5;
    flex-shrink: 0;
}

.principle-content h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.principle-content p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 模式视频容器 - PC端sticky定位 */
.model-video-container {
    position: relative;
}

.model-video-container .video-wrapper {
    position: sticky;
    top: 100px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 16/9;
}

/* ARES介绍 */
.ares-section {
    background: var(--bg-light);
}

.ares-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.ares-text h3 {
    font-size: 1.5rem;
    margin: 1.5rem 0 1rem;
    color: var(--primary-color);
}

.ares-text p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.ares-features {
    list-style: none;
    margin-top: 1.5rem;
}

.ares-features li {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.ares-features li:hover {
    transform: translateX(5px);
}

.feature-icon {
    font-size: 2rem;
}

.feature-content h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.feature-content p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.ares-videos {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.video-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.video-card h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    text-align: center;
}

.video-card video {
    width: 100%;
    border-radius: 8px;
}

/* 我们的模式 */
.model-section {
    background: var(--white);
}

.model-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.model-text h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.model-text > p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.model-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.model-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.model-item:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateX(10px);
}

.model-item:hover .model-number {
    color: var(--accent-color);
}

.model-item:hover h4,
.model-item:hover p {
    color: var(--white);
}

.model-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--secondary-color);
    opacity: 0.5;
    transition: color 0.3s ease;
}

.model-desc h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

.model-desc p {
    color: var(--text-light);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.model-video video {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 100px;
}

/* 与爱同行 */
.charity-section {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
}

.charity-description {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.charity-video-container {
    max-width: 900px;
    margin: 0 auto 3rem;
}

.charity-video {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
}

.charity-gallery {
    margin-top: 3rem;
}

.charity-gallery h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.gallery-placeholder {
    aspect-ratio: 4/3;
    background: var(--white);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
}

.gallery-placeholder:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.gallery-placeholder p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.gallery-note {
    text-align: center;
    color: var(--text-light);
    font-style: italic;
    margin-top: 1rem;
}

/* 联系我们 */
.contact-section {
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.contact-item:hover {
    transform: translateX(10px);
}

.contact-icon {
    font-size: 2.5rem;
}

.contact-detail h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.contact-detail p {
    color: var(--text-light);
}

.contact-form {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.contact-form h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

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

.form-group textarea {
    resize: vertical;
}

/* 下载中心 */
.download-section {
    background: var(--white);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.download-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.download-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.download-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.download-desc {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-brand {
    text-align: center;
}

.footer-logo {
    height: 60px;
    margin-bottom: 1rem;
}

.footer-brand p {
    opacity: 0.9;
}

.footer-links h4,
.footer-contact h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-contact p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    opacity: 0.8;
}

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

/* 响应式设计 */
/* 响应式设计 - 平板和移动端 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
        gap: 1.5rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    /* 所有双栏布局改为单栏 */
    .about-intro-content,
    .ares-detail-content,
    .cooperation-detail-content,
    .model-intro-content,
    .model-content,
    .ares-intro,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    /* 移动端视频容器取消sticky定位 */
    .about-intro-video .video-wrapper,
    .ares-videos-container,
    .cooperation-video-container .video-wrapper,
    .model-video-container .video-wrapper {
        position: relative !important;
        top: auto !important;
        order: -1; /* 视频在移动端显示在上方 */
    }

    /* 移动端视频尺寸优化 */
    .video-wrapper {
        aspect-ratio: 16/9;
        max-height: 400px;
    }

    /* 移动端标题字号调整 */
    .about-intro-text h2,
    .ares-detail-text h2,
    .cooperation-detail-text h2,
    .model-intro-text h2 {
        font-size: 1.8rem;
    }

    /* 移动端网格布局优化 */
    .values-grid,
    .highlights-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .download-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    /* 移动端时间线优化 */
    .timeline::before {
        left: 20px;
    }

    .timeline-dot {
        left: 20px;
    }

    .timeline-content {
        width: calc(100% - 60px);
        margin-left: 60px !important;
        margin-right: 0 !important;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

    /* 小屏幕标题进一步优化 */
    .about-intro-text h2,
    .ares-detail-text h2,
    .cooperation-detail-text h2,
    .model-intro-text h2 {
        font-size: 1.6rem;
    }

    /* 小屏幕视频高度限制 */
    .video-wrapper {
        max-height: 300px;
    }

    .download-grid {
        grid-template-columns: 1fr;
    }

    /* 小屏幕内边距调整 */
    .container {
        padding: 0 15px;
    }

    .advantage-item,
    .principle-item {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* 语言切换器样式 */
.language-switcher {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-left: 1.5rem; /* 与导航菜单保持间距 */
}

.lang-btn {
    padding: 0.4rem 0.8rem;
    border: 2px solid var(--primary-color);
    background: white;
    color: var(--primary-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.lang-btn:hover {
    background: rgba(230, 0, 18, 0.1);
    transform: translateY(-2px);
}

.lang-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 2px 8px rgba(230, 0, 18, 0.3);
}

/* 移动端语言切换器适配 */
@media (max-width: 768px) {
    .language-switcher {
        position: absolute;
        right: 60px; /* 汉堡菜单左侧 */
        top: 50%;
        transform: translateY(-50%);
        margin-left: 0;
        z-index: 1001; /* 确保在菜单之上 */
    }
    
    .lang-btn {
        font-size: 0.8rem;
        padding: 0.3rem 0.6rem;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* SVG图标样式 */
.icon-svg {
    width: 48px;
    height: 48px;
    fill: var(--primary-color);
    margin-bottom: 1rem;
}

.icon-svg-large {
    width: 64px;
    height: 64px;
    fill: var(--primary-color);
    margin-bottom: 1.5rem;
}

/* 视频容器优化 */
.video-wrapper {
    position: relative;
    width: 100%;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
}

.video-wrapper video {
    width: 100%;
    display: block;
}

.video-poster {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.video-poster:hover {
    opacity: 0.9;
}

.play-button {
    width: 80px;
    height: 80px;
    background: rgba(230, 0, 18, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.play-button:hover {
    transform: scale(1.1);
    background: rgba(230, 0, 18, 1);
}

.play-button svg {
    width: 40px;
    height: 40px;
    fill: white;
    margin-left: 5px;
}

/* 视频播放按钮动画 */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(230, 0, 18, 0.7);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 15px rgba(230, 0, 18, 0);
    }
}

.play-button {
    animation: pulse 2s infinite;
}

.video-poster:hover .play-button {
    animation: none;
}

/* 视频容器阴影增强 */
.video-wrapper {
    transition: all 0.3s ease;
}

.video-wrapper:hover {
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

/* 核心价值观和核心理念图标样式 */
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.value-item {
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-align: center;
}

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

.icon-svg {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
    stroke: currentColor;
    fill: none;
    stroke-width: 1.5;
    transition: all 0.3s ease;
}

.value-item:hover .icon-svg {
    transform: scale(1.1) rotate(5deg);
    color: var(--secondary-color);
}

.value-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.value-item p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

.company-values h3,
.core-concepts h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 1rem;
}

/* ==================== 视频播放器样式 ==================== */
.video-container {
    width: 100%;
    max-width: 900px;
    margin: 3rem auto;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    background: #ffffff;
    position: relative;
    transition: all 0.3s ease;
}

.video-container:hover {
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.25);
    transform: translateY(-4px);
}

.video-container video {
    width: 100%;
    height: auto;
    display: block;
    background: #ffffff;
    outline: none;
}

/* 视频标题区域 */
.video-info {
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, #f9fafb 0%, #ffffff 100%);
    border-top: 3px solid var(--primary-color);
}

.video-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.video-info p {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.6;
}

/* ==================== ARES视频区域专属样式 ==================== */
.ares-videos-section {
    margin-top: 4rem;
    padding: 3rem 0;
}

.ares-videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2.5rem;
    margin-top: 2rem;
}

.video-card-enhanced {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.video-card-enhanced:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(230, 0, 18, 0.15);
    border-color: rgba(230, 0, 18, 0.3);
}

.video-card-enhanced .video-container {
    margin: 0;
    max-width: 100%;
    border-radius: 0;
    box-shadow: none;
}

.video-card-enhanced .video-container:hover {
    transform: none;
    box-shadow: none;
}

.video-card-enhanced .video-info {
    padding: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    border-top: 3px solid var(--primary-color);
}

.video-card-enhanced .video-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.video-card-enhanced .video-info h3::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 2px;
}

.video-card-enhanced .video-info p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-left: 0.9rem;
}

/* 响应式视频 */
@media (max-width: 768px) {
    .video-container {
        margin: 2rem 1rem;
        border-radius: 12px;
    }
    
    .video-info {
        padding: 1rem 1.5rem;
    }
    
    .video-info h3 {
        font-size: 1.25rem;
    }
    
    .video-info p {
        font-size: 0.9rem;
    }
    
    /* ARES视频区域移动端优化 */
    .ares-videos-section {
        margin-top: 2rem;
        padding: 2rem 0;
    }
    
    .ares-videos-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .video-card-enhanced .video-info h3 {
        font-size: 1.1rem;
    }
    
    .video-card-enhanced .video-info p {
        font-size: 0.9rem;
    }
}