/* 业务领域页面样式 */
.business-banner {
    height: 240px;
    background: linear-gradient(135deg, var(--primary-color), #2980b9);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-align: center;
    margin-top: 64px;
}

.business-banner h1 {
    font-size: 48px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* 二级导航 */
.sub-nav {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 80px;
    z-index: 100;
    border-bottom: 1px solid #eee;
}

.sub-nav .container {
    display: flex;
    justify-content: flex-start;
    overflow-x: auto;
}

.sub-nav a {
    padding: 20px 30px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 16px;
    position: relative;
    white-space: nowrap;
    transition: all 0.3s;
}

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

.sub-nav a.active {
    color: var(--primary-color);
}

.sub-nav a.active:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
}

/* 业务介绍 */
.business-intro {
    padding:80px 0px 60px 0;
}

.business-intro h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--text-color);
    text-align: center;
}

.business-intro p {
    font-size: 16px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 30px;
    text-align: center;
    /* max-width: 800px; */
    margin-left: auto;
    margin-right: auto;
}

/* 业务板块 */
.business-blocks {
    margin-top: 40px;
}

.business-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
    align-items: center;
}

.business-block:nth-child(even) {
    direction: rtl;
}

.business-block:nth-child(even) .block-content {
    direction: ltr;
}

.business-block:nth-child(even) .block-image {
    direction: ltr;
}

.block-content {
    padding: 20px;
}

.block-content h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.block-content p {
    font-size: 16px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 20px;
}

.block-content ul {
    list-style-type: disc;
    padding-left: 20px;
    margin-bottom: 20px;
}

.block-content ul li {
    margin-bottom: 10px;
    color: #666;
}

.block-image img {
    width: 100%;
    height: 350px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* 业务优势 */
.business-advantages {
    background: #f8f8f8;
    padding: 60px 0;
}

.business-advantages h2 {
    font-size: 32px;
    margin-bottom: 40px;
    color: var(--text-color);
    text-align: center;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-item {
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: all 0.3s;
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.advantage-item i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: block;
}

.advantage-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.advantage-item p {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
}

/* 响应式布局 */
@media (max-width: 1024px) {
    .business-block {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .business-block:nth-child(even) {
        direction: ltr;
    }

    .block-image {
        order: -1;
    }

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

@media (max-width: 768px) {
    .business-banner {
        height: 180px;
        margin-top: 80px;
    }

    .business-banner h1 {
        font-size: 32px;
    }

    .sub-nav a {
        padding: 15px 20px;
    }

    .business-intro h2 {
        font-size: 26px;
    }

    .block-content h3 {
        font-size: 24px;
    }

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