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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, 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 {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--text-light);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: 0.3s;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 150px 0 100px;
    margin-top: 70px;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s 0.2s backwards;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s 0.4s backwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 0.8s 0.6s backwards;
}

.btn {
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

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

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

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

/* 公司简介 */
.intro {
    padding: 80px 0;
    background: var(--bg-white);
}

.intro-content h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
    text-align: center;
}

.intro-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 1rem;
    text-align: justify;
}

/* 通用区块标题 */
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* 核心优势 */
.advantages {
    padding: 80px 0;
    background: var(--bg-white);
}

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

.advantage-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-white);
}

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

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.advantage-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 产品服务 */
.products {
    padding: 80px 0;
    background: var(--bg-light);
}

.product-categories {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.category-btn {
    padding: 10px 24px;
    border: 2px solid var(--border-color);
    background: var(--bg-white);
    color: var(--text-dark);
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s;
}

.category-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
}

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

.product-card.hidden {
    display: none;
}

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

.product-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.product-category {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.product-desc {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-top: auto;
}

.feature-tag {
    background: var(--bg-light);
    color: var(--text-dark);
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
}

/* 服务领域 */
.services {
    padding: 80px 0;
    background: var(--bg-white);
}

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

.service-item {
    text-align: center;
    padding: 2rem;
    border-radius: 12px;
    transition: all 0.3s;
}

.service-item:hover {
    background: var(--bg-light);
    transform: translateY(-5px);
}

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

.service-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

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

/* 企业业务 */
.business {
    padding: 80px 0;
    background: var(--bg-light);
}

/* 业务概览 */
.business-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

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

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

.overview-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.overview-label {
    color: var(--text-light);
    font-size: 1rem;
}

/* 投资企业卡片 */
.business-companies {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    margin-bottom: 4rem;
}

.company-card {
    background: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s;
}

.company-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.company-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 2.5rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    color: white;
}

.company-logo {
    flex-shrink: 0;
}

.logo-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    backdrop-filter: blur(10px);
}

.company-info h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.company-subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1rem;
}

.company-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.95rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.meta-item i {
    font-style: normal;
}

.company-content {
    padding: 2.5rem;
}

.company-description,
.company-services,
.company-advantages {
    margin-bottom: 2rem;
}

.company-content h4 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.company-description p {
    color: var(--text-light);
    line-height: 1.8;
    text-align: justify;
}

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

.service-tag {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 12px;
    transition: all 0.3s;
}

.service-tag:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    transform: translateX(5px);
}

.tag-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.tag-content strong {
    display: block;
    color: var(--text-dark);
    margin-bottom: 0.3rem;
    font-size: 1rem;
}

.tag-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

.advantages-list {
    list-style: none;
    padding: 0;
}

.advantages-list li {
    padding: 0.8rem 0;
    color: var(--text-light);
    line-height: 1.6;
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
}

.check-icon {
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

/* 业务协同 */
.business-synergy {
    background: var(--bg-white);
    padding: 3rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.business-synergy h3 {
    font-size: 2rem;
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.synergy-desc {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.synergy-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.flow-item {
    flex: 1;
    min-width: 180px;
    max-width: 220px;
    background: var(--bg-light);
    padding: 2rem 1.5rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
}

.flow-item:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.flow-item:hover .flow-icon {
    transform: scale(1.2);
}

.flow-item:hover h4,
.flow-item:hover p {
    color: white;
}

.flow-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    transition: all 0.3s;
}

.flow-item h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.flow-item p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.5;
    margin: 0;
}

.flow-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: bold;
    flex-shrink: 0;
}

/* 发展历程 */
.timeline {
    padding: 80px 0;
    background: var(--bg-white);
}

.timeline-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

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

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    flex: 0 0 45%;
    text-align: right;
    padding-right: 2rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.timeline-item:nth-child(even) .timeline-year {
    text-align: left;
    padding-left: 2rem;
    padding-right: 0;
}

.timeline-content {
    flex: 0 0 45%;
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    position: relative;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 20px;
    width: 15px;
    height: 15px;
    background: var(--primary-color);
    border-radius: 50%;
}

.timeline-item:nth-child(odd) .timeline-content::before {
    left: -7.5px;
}

.timeline-item:nth-child(even) .timeline-content::before {
    right: -7.5px;
}

.timeline-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

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

/* 合作伙伴 */
.partners {
    padding: 80px 0;
    background: var(--bg-light);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.partner-logo {
    background: var(--bg-white);
    padding: 3rem 2rem;
    border-radius: 12px;
    text-align: center;
    color: var(--text-light);
    font-weight: 500;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

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

/* 关于我们 */
.about {
    padding: 80px 0;
    background: var(--bg-light);
}

.about-intro {
    background: var(--bg-white);
    padding: 3rem;
    border-radius: 12px;
    margin-bottom: 3rem;
    box-shadow: var(--shadow);
}

.about-intro p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 1rem;
    text-align: justify;
}

.about-intro p:last-child {
    margin-bottom: 0;
}

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

.about-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.about-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.about-card ul {
    list-style: none;
}

.about-card li {
    padding: 0.5rem 0;
    color: var(--text-light);
    line-height: 1.8;
}

.about-card li strong {
    color: var(--text-dark);
}

.about-card p {
    color: var(--text-light);
    line-height: 1.8;
}

.note {
    font-size: 0.85rem;
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-light);
    border-radius: 8px;
}

/* 联系我们 */
.contact {
    padding: 80px 0;
    background: var(--bg-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

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

.contact-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

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

.contact-form {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
}

.contact-form h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
}

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

.contact-form button {
    width: 100%;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

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

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

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

.footer-section a:hover {
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow);
    }

    .nav-menu.active {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

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

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

    .products-grid,
    .about-grid,
    .advantages-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }

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

    .company-header {
        flex-direction: column;
        text-align: center;
    }

    .company-info h3 {
        font-size: 1.5rem;
    }

    .company-meta {
        justify-content: center;
    }

    .service-tags {
        grid-template-columns: 1fr;
    }

    .synergy-flow {
        flex-direction: column;
    }

    .flow-arrow {
        transform: rotate(90deg);
    }

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

    .product-categories {
        gap: 0.5rem;
    }

    .category-btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }

    /* 时间线响应式 */
    .timeline-container::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column !important;
        padding-left: 50px;
    }

    .timeline-year {
        text-align: left !important;
        padding: 0 0 0.5rem 0 !important;
        font-size: 1.2rem;
    }

    .timeline-content {
        flex: 1;
    }

    .timeline-content::before {
        left: -57px !important;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .intro,
    .products,
    .business,
    .about,
    .contact,
    .advantages,
    .services,
    .timeline,
    .partners {
        padding: 50px 0;
    }

    .product-categories {
        flex-direction: column;
    }

    .category-btn {
        width: 100%;
    }

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

    .business-overview {
        grid-template-columns: 1fr;
    }

    .company-header {
        padding: 1.5rem;
    }

    .logo-icon {
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }

    .company-content {
        padding: 1.5rem;
    }

    .business-synergy {
        padding: 2rem 1.5rem;
    }

    .synergy-flow {
        gap: 0.5rem;
    }

    .flow-item {
        min-width: 100%;
        padding: 1.5rem 1rem;
    }
}