/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #4a5568;
    overflow-x: hidden;
}

.card-link {
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.card-link:focus-visible {
    outline: 3px solid #1a365d;
    outline-offset: 4px;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #1a365d;
    font-weight: 700;
    font-size: 1.5rem;
}

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

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #1a365d;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #38a169;
    transition: width 0.3s ease;
}

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

/* 下拉菜单 */
/* 下拉菜单 */
.nav-item.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #fff;
    min-width: 180px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    list-style: none;
    padding: 0;
    border-radius: 5px;
    overflow: hidden;
}

.nav-item.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li a {
    color: #333;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
    transition: background-color 0.3s ease;
}

.dropdown-menu li a:hover {
    background-color: #f1f1f1;
}

/* 移动端菜单切换 */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #1a365d;
    margin: 3px 0;
    transition: 0.3s;
}

/* 英雄区域 */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 54, 93, 0.7);
    z-index: 1;
}

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

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.title-line {
    display: block;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
}

.title-line:nth-child(2) {
    animation-delay: 0.3s;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 0.6s forwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease 0.9s forwards;
}

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

.btn-primary {
    background: #38a169;
    color: white;
    border-color: #38a169;
}

.btn-primary:hover {
    background: #2f855a;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(56, 161, 105, 0.3);
}

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

.btn-secondary:hover {
    background: white;
    color: #1a365d;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-arrow {
    width: 30px;
    height: 30px;
    border: 2px solid white;
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) rotate(45deg) translateY(0);
    }
    40% {
        transform: translateX(-50%) rotate(45deg) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) rotate(45deg) translateY(-5px);
    }
}

/* 通用区域样式 */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a365d;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: #718096;
    max-width: 600px;
    margin: 0 auto;
}

/* 关于我们 */
.about {
    background: #f7fafc;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #38a169;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: #718096;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.about-description p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
    line-height: 1.8;
}

.about-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 业务领域 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.service-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

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

.service-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 1rem;
}

.service-description {
    color: #718096;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.service-link {
    color: #38a169;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.service-link:hover {
    color: #2f855a;
}

/* 服务优势 */
.advantages {
    background: #1a365d;
    color: white;
}

.advantages-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.advantages .section-title {
    color: white;
    text-align: left;
    margin-bottom: 2rem;
}

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

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

.advantage-icon {
    width: 40px;
    height: 40px;
    background: #38a169;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.advantage-content h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.advantage-content p {
    color: #cbd5e0;
    line-height: 1.6;
}

.advantages-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* 案例展示 */
.portfolio {
    background: #f7fafc;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.portfolio-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.portfolio-item:hover {
    transform: translateY(-5px);
}

.portfolio-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.portfolio-item:hover img {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    padding: 30px 20px 20px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.portfolio-item:hover .portfolio-overlay {
    transform: translateY(0);
}

.portfolio-overlay h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.portfolio-overlay p {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* 新闻动态 */
.news-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 30px;
}

.news-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.news-item:hover {
    transform: translateY(-5px);
}

.news-item.featured {
    grid-row: span 2;
}

.news-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-item.featured img {
    height: 300px;
}

.news-content {
    padding: 20px;
}

.news-date {
    color: #38a169;
    font-size: 0.875rem;
    font-weight: 600;
}

.news-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a365d;
    margin: 0.5rem 0 1rem;
    line-height: 1.4;
}

.news-excerpt {
    color: #718096;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.news-link {
    color: #38a169;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.news-link:hover {
    color: #2f855a;
}

/* 联系我们 */
.contact {
    background: #f7fafc;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-icon {
    font-size: 1.5rem;
    width: 50px;
    height: 50px;
    background: #38a169;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 0.5rem;
}

.contact-details p {
    color: #718096;
    line-height: 1.6;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1a365d;
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #38a169;
}

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

/* 页脚 */
.footer {
    background: #1a365d;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

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

.footer-section p {
    color: #cbd5e0;
    line-height: 1.6;
    margin-bottom: 1rem;
}

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

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

.footer-section ul li a {
    color: #cbd5e0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #38a169;
}

.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-link {
    display: inline-block;
    padding: 8px 16px;
    background: #38a169;
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.875rem;
    transition: background 0.3s ease;
}

.social-link:hover {
    background: #2f855a;
}

.footer-bottom {
    border-top: 1px solid #2d3748;
    padding-top: 20px;
    text-align: center;
    color: #cbd5e0;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #38a169;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

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

.back-to-top:hover {
    background: #2f855a;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }

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

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

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

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

    .about-content,
    .advantages-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        justify-content: center;
    }

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

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

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

    .news-item.featured {
        grid-row: span 1;
    }

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

    .advantages .section-title {
        text-align: center;
    }

    .advantage-list {
        text-align: center;
    }

    .advantage-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

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

    .section-title {
        font-size: 1.75rem;
    }

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

    .service-card {
        padding: 20px;
    }

    .contact-form {
        padding: 30px 20px;
    }
}

/* AOS动画库样式 */
[data-aos] {
    opacity: 0;
    transition-property: opacity, transform;
}

[data-aos].aos-animate {
    opacity: 1;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

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



/* 新页面英雄区域 */
.page-hero {
    height: 40vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    overflow: hidden;
    background-size: cover;
    background-position: center;
}

.page-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 54, 93, 0.7); /* 纯色叠加，避免渐变 */
    z-index: 1;
}

.page-hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.page-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 新页面内容区域 */
.page-content {
    padding: 60px 0;
    background-color: #ffffff;
}

.content-block {
    margin-bottom: 40px;
    padding: 20px;
    border-radius: 8px;
    background-color: #f9f9f9;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.content-block:last-child {
    margin-bottom: 0;
}

.content-title {
    font-size: 2rem;
    color: #1a365d;
    margin-bottom: 15px;
    border-bottom: 2px solid #38a169;
    padding-bottom: 10px;
}

.content-block p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #4a5568;
    margin-bottom: 15px;
}

.content-block ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 15px;
}

.content-block ul li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
    font-size: 1.05rem;
    color: #4a5568;
}

.content-block ul li::before {
    content: '✔';
    position: absolute;
    left: 0;
    color: #38a169;
    font-weight: bold;
}

.content-image {
    width: 100%;
    max-width: 700px;
    height: auto;
    border-radius: 8px;
    margin: 20px auto;
    display: block;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .page-hero {
        height: 30vh;
    }

    .page-title {
        font-size: 2.2rem;
    }

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

    .content-title {
        font-size: 1.6rem;
    }

    .content-block p,
    .content-block ul li {
        font-size: 0.95rem;
    }
}


/* 移动端下拉菜单样式 */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        align-items: flex-start;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        transition: transform 0.3s ease-in-out;
        padding: 20px;
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-item {
        width: 100%;
        margin-bottom: 10px;
    }

    .nav-link {
        padding: 10px 0;
        width: 100%;
        text-align: left;
    }

    .nav-toggle {
        display: flex;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        border-radius: 0;
        background-color: #f7fafc;
        padding-left: 20px;
        margin-top: 5px;
        width: 100%;
        display: none; /* 默认隐藏 */
    }

    .dropdown-menu.active {
        display: block; /* 移动端点击时显示 */
    }

    .dropdown-menu li a {
        padding: 8px 0;
    }

    .nav-item.dropdown:hover .dropdown-menu {
        display: none; /* 禁用hover效果 */
    }
}