/* ======== 基础样式 ======== */
:root {
    /* 主色调 - 深蓝色 */
    --primary-color: #0033A0;
    /* 辅助色 - 浅蓝灰 */
    --secondary-color: #f5f7fa;
    /* 强调色 - 绿色 */
    --accent-color: #00A86B;
    /* 文本颜色 */
    --text-dark: #333333;
    --text-light: #666666;
    --text-white: #ffffff;
    /* 边框颜色 */
    --border-color: #e0e0e0;
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    /* 圆角 */
    --border-radius: 4px;
    /* 过渡 */
    --transition: all 0.3s ease;
}

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

body {
    font-family: "微软雅黑", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section-padding {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background-color: var(--accent-color);
    margin: var(--spacing-xs) auto 0;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-color);
    opacity: 0.9;
    color: var(--text-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 51, 160, 0.3);
}

.btn-secondary {
    background-color: var(--accent-color);
    color: var(--text-white);
}

.btn-secondary:hover {
    background-color: var(--accent-color);
    opacity: 0.9;
    color: var(--text-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 168, 107, 0.3);
}

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

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

/* ======== 头部导航 ======== */
.header {
    background-color: var(--text-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    color: var(--primary-color);
}

.logo img {
    height: 50px;
    width: auto;
    margin-right: var(--spacing-sm);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.main-nav ul {
    display: flex;
}

.main-nav li {
    margin-left: var(--spacing-md);
}

.main-nav a {
    color: var(--text-dark);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

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

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

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 78px;
    left: 0;
    width: 100%;
    background-color: var(--text-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 999;
    padding: var(--spacing-sm) 0;
    transform: translateY(-100%);
    transition: transform 0.3s ease-in-out;
}

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

.mobile-menu ul {
    display: flex;
    flex-direction: column;
}

.mobile-menu li {
    margin: var(--spacing-xs) 0;
}

.mobile-menu a {
    display: block;
    padding: var(--spacing-xs) var(--spacing-md);
    color: var(--text-dark);
    font-weight: 500;
}

.mobile-menu a:hover,
.mobile-menu a.active {
    color: var(--primary-color);
    background-color: var(--secondary-color);
}

/* ======== 主要横幅 ======== */
.hero {
    background: linear-gradient(rgba(0, 51, 160, 0.7), rgba(0, 51, 160, 0.7)), url('../images/hero-bg.gif') no-repeat center center/cover;
    height: 70vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-white);
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-content h2 {
    font-size: 2.8rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* ======== 关于我们 ======== */
.about {
    background-color: var(--secondary-color);
}

.about-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.about-image {
    flex: 1;
}

.about-image img {
    border-radius: var(--border-radius);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    height: 400px;
    width: 100%;
    object-fit: cover;
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.about-text p {
    margin-bottom: var(--spacing-sm);
}

.about-stats {
    display: flex;
    margin: var(--spacing-md) 0;
}

.stat-item {
    flex: 1;
    text-align: center;
    padding: var(--spacing-sm);
    border-right: 1px solid var(--border-color);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
}

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

/* ======== 核心业务 ======== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.service-card {
    background-color: var(--text-white);
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background-color: rgba(0, 51, 160, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-color);
}

.service-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.service-card p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.read-more {
    font-weight: 600;
    color: var(--primary-color);
    display: inline-flex;
    align-items: center;
}

.read-more i {
    margin-left: 5px;
    transition: var(--transition);
}

.read-more:hover i {
    transform: translateX(5px);
}

/* ======== 成功案例 ======== */
.cases {
    background-color: var(--secondary-color);
}

.cases-slider {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
    padding-bottom: var(--spacing-md);
    scrollbar-width: none; /* Firefox */
}

.cases-slider::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Edge */
}

.case-item {
    flex: 0 0 calc(33.333% - 20px);
    background-color: var(--text-white);
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.case-content {
    padding: var(--spacing-md);
}

.case-content h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.case-content p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.cases-nav {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-md);
    gap: var(--spacing-sm);
}

.cases-nav button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--text-white);
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.cases-nav button:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
}

/* ======== 合作伙伴 ======== */
.partners-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.partner-logo {
    flex: 0 0 calc(20% - 24px);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100px;
    background-color: var(--text-white);
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    padding: var(--spacing-sm);
    transition: var(--transition);
}

.partner-logo:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.partner-logo img {
    max-height: 80%;
    max-width: 80%;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: var(--transition);
}

.partner-logo:hover img {
    filter: grayscale(0);
    opacity: 1;
}

/* ======== 新闻资讯 ======== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.news-card {
    background-color: var(--text-white);
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: var(--transition);
}

.news-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.news-image {
    position: relative;
}

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

.news-date {
    position: absolute;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    color: var(--text-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    text-align: center;
}

.news-date .day {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
}

.news-date .month {
    font-size: 0.9rem;
}

.news-content {
    padding: var(--spacing-md);
}

.news-content h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
    line-height: 1.4;
}

.news-content p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-light);
}

.news-meta i {
    margin-right: 5px;
}

.news-more {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* ======== 联系我们 ======== */
.contact {
    background-color: var(--secondary-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.info-item {
    display: flex;
    margin-bottom: var(--spacing-md);
}

.info-icon {
    background-color: var(--primary-color);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-size: 1.2rem;
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
}

.info-text h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
}

.info-text p {
    color: var(--text-light);
    margin-bottom: 5px;
}

.contact-form {
    background-color: var(--text-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-dark);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 51, 160, 0.2);
}

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

.contact-form .btn {
    width: 100%;
}

/* Form validation styles */
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: #c62828;
    box-shadow: 0 0 0 2px rgba(198, 40, 40, 0.2);
}

.error-message {
    color: #c62828;
    font-size: 0.85rem;
    margin-top: 5px;
    display: none;
}

.form-notification {
    padding: 15px;
    margin-top: 20px;
    border-radius: var(--border-radius);
    display: none;
}

/* ======== 页脚 ======== */
.footer {
    background-color: #001f60;
    color: var(--text-white);
    padding-top: var(--spacing-xl);
}

.footer-top {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    flex: 1;
}

.footer-logo img {
    height: 60px;
    width: auto;
    margin-bottom: var(--spacing-sm);
}

.footer-logo p {
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-links {
    flex: 2;
    display: flex;
    gap: var(--spacing-md);
}

.footer-nav,
.footer-services,
.footer-contact {
    flex: 1;
}

.footer h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.footer h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--accent-color);
}

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

.footer ul li a,
.footer ul li {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer ul li a:hover {
    color: var(--text-white);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: center;
}

.footer-contact li i {
    margin-right: 10px;
    color: var(--accent-color);
}

.social-links {
    display: flex;
    gap: 10px;
    margin-top: var(--spacing-sm);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--text-white);
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md) 0;
    text-align: center;
    font-size: 0.9rem;
}

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

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
}

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

/* ======== 返回顶部按钮 ======== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 10px rgba(0, 51, 160, 0.3);
}

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

.back-to-top:hover {
    background-color: var(--accent-color);
    color: var(--text-white);
    transform: translateY(-5px);
}

/* ======== 响应式设计 ======== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partner-logo {
        flex: 0 0 calc(33.333% - 24px);
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .section-header h2 {
        font-size: 2rem;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero-content h2 {
        font-size: 2.5rem;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .about-image, .about-text {
        flex: 1 1 100%;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-slider {
        scroll-snap-type: x mandatory;
    }
    
    .case-item {
        flex: 0 0 calc(100% - 20px);
        scroll-snap-align: center;
    }
    
    .partner-logo {
        flex: 0 0 calc(50% - 24px);
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        flex-direction: column;
    }
    
    .footer-links {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .about-stats {
        flex-direction: column;
    }
    
    .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: var(--spacing-sm) 0;
    }
    
    .stat-item:last-child {
        border-bottom: none;
    }
    
    .partner-logo {
        flex: 0 0 100%;
    }
}