/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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: #333;
    background-color: #f8f9fa;
}

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

/* 顶部导航样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: transform 0.3s ease;
}

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

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

.navigation {
    display: flex;
    gap: 40px;
}

.nav-link {
    color: white;
    text-decoration: none;
    margin: 0 20px;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #ff6b35;
}

.nav-link.active {
    color: #ff6b35;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: #ff6b35;
    border-radius: 2px;
}

.nav-buttons {
    display: flex;
    gap: 20px;
    align-items: center;
}

/* 主横幅 */
.hero {
    height: 400px;
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), url('images/business-layout.png');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 通用区块标题 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #333;
    font-weight: 700;
}

/* 业务中心布局 */
.business-centers {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.centers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.center-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.center-icon {
    margin-bottom: 20px;
}

.center-icon img {
    width: 60px;
    height: 60px;
}

.center-card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
    font-weight: 600;
}

.center-image {
    margin: 20px 0;
}

.center-image img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: 10px;
}

.center-card p {
    color: #666;
    line-height: 1.6;
}

/* 口岸清关布局 */
.customs-layout {
    padding: 80px 0;
    background-color: white;
}

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

.layout-text h2 {
    font-size: 2.2rem;
    margin-bottom: 30px;
    color: #333;
    font-weight: 700;
}

.layout-text p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.8;
}

.layout-text ul {
    list-style: none;
    padding: 0;
}

.layout-text li {
    padding: 10px 0;
    color: #666;
    position: relative;
    padding-left: 25px;
}

.layout-text li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #007bff;
    font-weight: bold;
}

.layout-image img {
    width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* 物流仓储布局 */
.logistics-layout {
    padding: 80px 0;
    background-color: #f8f9fa;
}

/* 核心优势 */
.core-advantages {
    padding: 80px 0;
    background-color: white;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.advantage-card {
    background: white;
    border-radius: 15px;
    padding: 30px 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #f0f0f0;
}

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

.advantage-icon {
    margin-bottom: 20px;
}

.advantage-icon img {
    width: 80px;
    height: 80px;
}

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #333;
    font-weight: 600;
}

.advantage-card p {
    color: #666;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    padding: 30px 0 0 0;
}

.footer-content {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    padding-bottom: 20px;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.footer-logo-img {
    height: 40px;
    width: auto;
    margin-bottom: 8px;
}

.footer-domain {
    font-size: 14px;
    color: #ccc;
}

.footer-contact {
    flex: 1;
    max-width: 600px;
}

.contact-item {
    display: flex;
    margin-bottom: 8px;
    font-size: 14px;
}

.contact-label {
    color: #ccc;
    min-width: 80px;
}

.contact-value {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #555;
    padding: 15px 0;
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    font-size: 12px;
    color: #999;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .layout-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .centers-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}