@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700;800&display=swap');

:root {
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --primary-color: #1a3d7d;
    --primary-light: #407bc6;
    --primary-dark: #0f2852;
    --secondary-color: #00a0e9;
    --accent-color: #ff6b35;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-light: #7a7a9a;
    --bg-white: #ffffff;
    --bg-light: #f5f7fa;
    --bg-dark: #1a1a2e;
    --border-color: #e4e7ec;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --nav-gap: 40px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* ============ Header ============ */
.site-header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--primary-color);
    flex-shrink: 0;
}

.header-logo img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--nav-gap);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 0;
    position: relative;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all 0.3s ease;
}

/* ============ Hero Section ============ */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--bg-white);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: inherit;
    opacity: 0.9;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-content h1 {
    color: var(--bg-white);
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============ Buttons ============ */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--bg-white);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    background: #ff8555;
    color: var(--bg-white);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--bg-white);
    border: 2px solid rgba(255, 255, 255, 0.8);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--bg-white);
    color: var(--bg-white);
    transform: translateY(-2px);
}

/* ============ Section Title ============ */
.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    color: var(--text-primary);
    font-size: 2.25rem;
    margin-bottom: 16px;
}

.section-title p {
    font-size: 1.1rem;
    color: var(--text-light);
}

/* ============ Features Section ============ */
.features-section,
section {
    padding: 80px 0;
}

.section-alt {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-white);
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    border-radius: var(--radius-md);
    font-size: 2rem;
}

.feature-icon img {
    width: 48px;
    height: 48px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.feature-card h3 {
    font-size: 1.35rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============ Stats Section ============ */
.stats-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--bg-white);
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
}

.stat-item {
    text-align: center;
    color: var(--bg-white);
}

.stat-value {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--bg-white);
    flex-wrap: wrap;
}

.stat-value span {
    display: inline-flex;
    align-items: baseline;
}

.stat-value img,
.stat-value span:first-child {
    font-size: 2rem;
    opacity: 0.9;
}

.stat-value img {
    width: 48px;
    height: 48px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.stat-label {
    font-size: 1.05rem;
    opacity: 0.9;
    color: var(--bg-white);
}

/* ============ Products Grid ============ */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    background: linear-gradient(135deg, var(--bg-light), #e8ecf3);
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--primary-color);
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
}

.product-content {
    padding: 24px;
}

.product-content h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.product-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* ============ Cases Grid ============ */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.case-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    background: linear-gradient(135deg, var(--bg-light), #e8ecf3);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: var(--primary-color);
    overflow: hidden;
}

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

.case-content {
    padding: 24px;
}

.case-content h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.case-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ============ News Grid ============ */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.news-image {
    background: linear-gradient(135deg, var(--bg-light), #e8ecf3);
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary-color);
    overflow: hidden;
}

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

.news-content {
    padding: 24px;
}

.news-meta {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.news-content h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: var(--text-primary);
    line-height: 1.5;
}

.news-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.news-read-more {
    margin-top: 16px;
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 500;
}

.news-card:hover .news-read-more {
    color: var(--primary-dark);
}

/* ============ News Article (Detail Page) ============ */
.news-article {
    max-width: 800px;
    margin: 0 auto;
}

.news-article-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.news-article-header {
    border-bottom: 2px solid var(--bg-light);
    padding-bottom: 24px;
    margin-bottom: 32px;
}

.news-article-header h1 {
    font-size: 2rem;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 16px;
}

.news-article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.article-tag {
    background: var(--primary-color);
    color: var(--bg-white);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.news-article-image {
    margin: 32px 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-light);
}

.news-article-image img {
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: cover;
    display: block;
}

.news-article-video {
    margin: 32px 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-light);
}

.news-article-video iframe,
.news-article-video video {
    width: 100%;
    height: 420px;
    display: block;
    border: none;
}

.news-article-body {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-primary);
}

.news-article-body p {
    margin-bottom: 20px;
    text-align: justify;
}

.news-article-footer {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 2px solid var(--bg-light);
    text-align: center;
}

.breadcrumb {
    font-size: 0.9rem;
    color: var(--bg-white);
    opacity: 0.9;
}

.breadcrumb a {
    color: var(--bg-white);
    text-decoration: none;
    transition: opacity 0.2s;
}

.breadcrumb a:hover {
    opacity: 0.7;
}

.breadcrumb span {
    margin: 0 8px;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .news-article-card {
        padding: 24px;
    }

    .news-article-header h1 {
        font-size: 1.4rem;
    }

    .news-article-video iframe,
    .news-article-video video {
        height: 240px;
    }

    .news-article-body {
        font-size: 1rem;
        line-height: 1.8;
    }
}

/* ============ Page Header (Sub-pages) ============ */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: var(--bg-white);
    padding: 80px 0 60px;
    text-align: center;
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: inherit;
    opacity: 0.9;
    z-index: 0;
}

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

.page-header h1 {
    color: var(--bg-white);
    font-size: 2.5rem;
    margin-bottom: 16px;
    font-weight: 800;
}

.page-header p {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.9);
}

/* ============ Platform Intro Grid ============ */
.platform-intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.platform-intro-text h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.platform-intro-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.platform-intro-image {
    background: linear-gradient(135deg, var(--bg-light), #e8ecf3);
    border-radius: var(--radius-lg);
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.placeholder-img {
    color: var(--primary-color);
    opacity: 0.5;
}

/* ============ Preview & Video & Module Grids ============ */
.previews-grid,
.videos-grid,
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 32px;
}

/* ============ Platform Preview ============ */
.preview-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.preview-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.preview-image {
    background: linear-gradient(135deg, var(--bg-light), #e8ecf3);
    height: 280px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 24px;
    overflow: hidden;
}

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

.preview-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.preview-card p {
    color: var(--text-secondary);
}

/* ============ Video Section ============ */
.video-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.video-embed {
    background: #000;
    height: 260px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--bg-white);
    overflow: hidden;
}

.video-embed iframe,
.video-embed video {
    width: 100%;
    height: 100%;
    border: none;
        object-fit: cover;
}

.video-card h3 {
    padding: 20px 24px 8px;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.video-card p {
    padding: 0 24px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============ About Page - Team & Timeline ============ */
.team-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: row;
    padding: 20px;
    gap: 20px;
}

.team-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.team-image {
    background: linear-gradient(135deg, var(--bg-light), #e8ecf3);
    width: 130px;
    height: 140px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    border: 2px solid var(--border-color);
}

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

.team-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.team-info h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.team-role {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 0.98rem;
    display: inline-block;
    padding: 4px 12px;
    background: rgba(26, 61, 125, 0.1);
    border-radius: var(--radius-sm);
    align-self: flex-start;
}

.team-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin: 0;
}

/* 团队网格布局 */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

/* 响应式调整 */
@media (max-width: 576px) {
    .team-card {
        flex-direction: column;
        text-align: center;
    }
    
    .team-image {
        margin: 0 auto;
        width: 130px;
        height: 140px;
    }
    
    .team-role {
        align-self: center;
    }
}

/* Timeline - Centered */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    width: 100%;
    margin-bottom: 50px;
    padding: 0;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: calc(50% + 40px);
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: calc(50% + 40px);
    text-align: left;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 8px;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--bg-white);
    border-radius: 50%;
    border: 4px solid var(--primary-color);
    box-shadow: 0 0 0 3px var(--bg-white), 0 0 0 5px rgba(26, 61, 125, 0.2);
    z-index: 2;
}

.timeline-content {
    background: var(--bg-white);
    padding: 24px 28px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.timeline-content h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 6px;
    font-weight: 600;
}

.timeline-content h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 500;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.75;
    font-size: 0.95rem;
    margin: 0;
}

/* Timeline - Mobile */
@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }

    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        margin-left: 60px;
        margin-right: 0;
        text-align: left;
    }

    .timeline-dot {
        left: 20px;
    }

    .timeline-content {
        padding: 18px 20px;
    }

    .timeline-content h3 {
        font-size: 1.1rem;
    }

    .timeline-content h4 {
        font-size: 1rem;
    }
}

/* ============ News Page - Pagination ============ */
.news-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 48px;
    flex-wrap: wrap;
}

.pagination-btn {
    padding: 10px 16px;
    background: var(--bg-white);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    font-family: var(--font-family);
}

.pagination-btn:hover:not(:disabled) {
    background: var(--primary-color);
    color: var(--bg-white);
    border-color: var(--primary-color);
}

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

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

/* ============ Contact Page ============ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    background: var(--bg-white);
    padding: 24px;
    border-radius: var(--radius-lg);
    display: flex;
    gap: 20px;
    align-items: flex-start;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-icon img {
    width: 48px;
    height: 48px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.contact-text h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.contact-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.contact-form-section {
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.contact-form-section h2 {
    margin-bottom: 24px;
    font-size: 1.75rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-family);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 61, 125, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.map-container {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    margin-top: 48px;
    border: 1px solid var(--border-color);
}

.map-container iframe {
    width: 100%;
    height: 450px;
    border: none;
    display: block;
}

/* ============ Footer ============ */
.site-footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.9);
    padding: 64px 0 24px;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-col h3 {
    color: var(--bg-white);
    font-size: 1.35rem;
    margin-bottom: 16px;
}

.footer-col h4 {
    color: var(--bg-white);
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.footer-col p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.2s ease;
    font-size: 0.95rem;
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin-bottom: 4px;
}

/* ============ Back to Top ============ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top:hover {
    background: var(--primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

/* ============ Responsive Design ============ */
@media (max-width: 968px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .platform-intro-grid,
    .about-intro-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-intro-image {
        max-width: 100%;
        margin: 0 auto;
    }

    .about-intro-image img {
        max-width: 100%;
        max-height: 250px;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }
    h3 { font-size: 1.3rem; }

    .container {
        padding: 0 16px;
    }

    section,
    .features-section,
    .section-alt {
        padding: 48px 0;
    }

    .hero-section {
        padding: 60px 0;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .section-title h2 {
        font-size: 1.6rem;
    }

    .menu-toggle {
        display: flex;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        padding: 20px 24px;
        box-shadow: var(--shadow-md);
        flex-direction: column;
    }

    .main-nav.open {
        display: flex;
    }

    .nav-menu {
        flex-direction: column;
        gap: 12px;
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-link.active::after {
        display: none;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }

    .page-header {
        padding: 60px 0 40px;
    }

    .page-header h1 {
        font-size: 1.85rem;
    }

    .contact-form-section {
        padding: 24px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    .features-grid,
    .products-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }

    .stat-value {
        font-size: 2rem;
    }
}

/* ============ 增强样式：新功能支持 ============ */

/* 产品特征标签 */
.product-features {
    margin-top: 12px;
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 500;
    padding-top: 10px;
    border-top: 1px dashed var(--border-color);
    line-height: 1.6;
}

/* 案例分类和元信息 */
.case-category {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), #4a7fc7);
    color: white;
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 10px;
    font-weight: 500;
}

.case-meta {
    margin-top: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 4px 0;
}

.case-meta span {
    color: var(--primary-color);
    font-weight: 500;
    margin-right: 6px;
}

/* 新闻元信息 */
.news-meta span {
    margin-right: 16px;
    font-size: 0.85rem;
}

/* 平台和公司图片 - 空src时隐藏 */
.platform-intro-image img[src=""],
.platform-intro-image img:not([src]),
.about-intro-image img[src=""],
.about-intro-image img:not([src]) {
    display: none !important;
}

/* 当图片容器中的图片不存在时，调整高度 */
.platform-intro-image img:not([src]) + *,
.about-intro-image img:not([src]) + * {
    display: none;
}

/* 荣誉资质 - 一排4个大图片 */
.honors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* 荣誉卡片增强 */
.honor-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.honor-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.honor-image {
    background: linear-gradient(135deg, #f8f9ff, #e8ecf3);
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary-color);
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
}

.honor-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 20px;
}

.honor-info {
    padding: 20px;
    text-align: center;
}

.honor-info h3 {
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.honor-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

/* 响应式：小屏幕自动调整为2列或1列 */
@media (max-width: 992px) {
    .honors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .honor-image {
        height: 260px;
    }
}

@media (max-width: 576px) {
    .honors-grid {
        grid-template-columns: 1fr;
    }
    .honor-image {
        height: 240px;
    }
}

/* 团队卡片 - 统一 */
.team-image {
    background: linear-gradient(135deg, #f8f9ff, #e8ecf3);
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: var(--primary-color);
    overflow: hidden;
}

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

/* 关于我们 - 公司介绍图片限制 */
.about-intro-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-intro-text h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-intro-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-intro-image {
    background: linear-gradient(135deg, var(--bg-light), #e8ecf3);
    border-radius: var(--radius-lg);
    max-width: 450px;
    max-height: 300px;
    height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-left: auto;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.about-intro-image img {
    width: 100%;
    max-width: 450px;
    max-height: 300px;
    height: auto;
    object-fit: cover;
    display: block;
}

/* 空src时隐藏图片容器 */
.about-intro-image img[src=""],
.about-intro-image img:not([src]) {
    display: none !important;
}