/* 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;
}

/* 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: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: #1890ff;
}

.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;
}

/* 主横幅样式 */
.hero {
    position: relative;
    width: 100%;
    height: 400px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero .banner {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: bold;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

/* 业务介绍样式 */
.business-intro {
    padding: 60px 0;
    background: white;
}

.intro-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #666;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* 主营业务横幅 */
.business-banner {
    position: relative;
    width: 100%;
    height: 400px;
    overflow: hidden;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
}

.banner-content {
    position: relative;
    width: 100%;
    height: 100%;
}

.banner-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 60, 114, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-title {
    color: white;
    font-size: 48px;
    font-weight: 700;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* 业务介绍 */
.business-intro {
    background: white;
    padding: 60px 0;
}

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

.intro-text {
    font-size: 18px;
    line-height: 1.8;
    color: #666;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

/* 业务模块样式 */
.business-modules {
    padding: 80px 0;
    background: #f8f9fa;
}

.modules-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.module-card {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.module-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.module-line {
    width: 4px;
    height: 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin-right: 15px;
    border-radius: 2px;
}

.module-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2c3e50;
    margin: 0;
}

.module-content {
    margin-bottom: 30px;
}

.module-content p {
    font-size: 1rem;
    line-height: 1.8;
    color: #666;
    margin: 0;
}

.module-image {
    text-align: center;
    margin-top: 20px;
}

.module-image img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

/* 数字化服务时间轴样式 */
.module-timeline {
    margin-top: 30px;
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px 0;
    border-left: 3px solid #e9ecef;
    padding-left: 20px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background: #667eea;
    border-radius: 50%;
}

.timeline-year {
    font-weight: 600;
    color: #667eea;
    margin-right: 20px;
    min-width: 60px;
}

.timeline-content {
    color: #666;
    font-size: 0.95rem;
}

/* 业务流程 */
.business-flow {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.flow-item {
    display: flex;
    align-items: center;
}

.flow-circle {
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    color: white;
    padding: 12px 20px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.flow-item:not(:last-child)::after {
    content: '→';
    margin-left: 15px;
    color: #ff6b35;
    font-size: 18px;
    font-weight: bold;
}

/* 平台图标 */
.platform-icons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 300px;
}

.platform-icon {
    width: 80px;
    height: 80px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.platform-icon:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

/* 物流图片 */
.logistics-images {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.logistics-img {
    width: 100px;
    height: 100px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

/* 时间轴 */
.timeline {
    position: relative;
    max-width: 400px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, #ff6b35, #1e3c72);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 30px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 14px;
    top: 8px;
    width: 12px;
    height: 12px;
    background: #ff6b35;
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 0 3px #ff6b35;
}

.timeline-year {
    font-size: 18px;
    font-weight: 700;
    color: #1e3c72;
    margin-bottom: 5px;
}

.timeline-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.5;
}

/* 底部样式 */
.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-container {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
    }
    
    .navigation {
        gap: 20px;
        margin: 15px 0;
    }
    
    .nav-buttons {
        gap: 15px;
    }
    
    .banner-title {
        font-size: 32px;
    }
    
    .module-content,
    .module-content.reverse {
        flex-direction: column;
    }
    
    .module-text,
    .module-image {
        padding: 30px 20px;
    }
    
    .business-flow {
        justify-content: center;
    }
    
    .flow-item:not(:last-child)::after {
        display: none;
    }
    
    .platform-icons {
        grid-template-columns: repeat(4, 1fr);
        gap: 15px;
    }
    
    .platform-icon {
        width: 60px;
        height: 60px;
    }
    
    .logistics-images {
        justify-content: center;
    }
    
    .logistics-img {
        width: 80px;
        height: 80px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-contact {
        text-align: center;
    }
}

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

.business-module {
    animation: fadeInUp 0.6s ease-out;
}

.business-module:nth-child(2) {
    animation-delay: 0.1s;
}

.business-module:nth-child(3) {
    animation-delay: 0.2s;
}

.business-module:nth-child(4) {
    animation-delay: 0.3s;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}