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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    background-color: #fff;
}

/* 表头样式 */
.header {
    background-color: #fff;
    border-bottom: 1px solid #f0f0f0;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.logo-text h1 {
    font-size: 24px;
    font-weight: bold;
    color: #000;
    margin: 0;
    line-height: 1.2;
}

.logo-text p {
    font-size: 12px;
    color: #999;
    margin: 0;
    line-height: 1.2;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #000;
    font-size: 16px;
    padding: 5px 0;
    transition: color 0.3s;
    position: relative;
}

.nav-link:hover {
    color: #1890ff;
}

.nav-link.active {
    color: #1890ff;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: #1890ff;
}

/* 内容区域 */
.main-content {
    width: 100%;
}

.content-section {
    display: none;
    width: 100%;
}

.content-section.active {
    display: block;
}

.content-image {
    width: 100%;
    display: block;
    margin: 0;
    padding: 0;
    vertical-align: top;
}

/* 页脚链接样式 */
.footer-link {
    display: block;
    width: 100%;
    cursor: pointer;
    text-decoration: none;
}

.footer-link:hover {
    opacity: 0.9;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
    }

    .logo-text h1 {
        font-size: 20px;
    }

    .nav {
        gap: 20px;
    }

    .nav-link {
        font-size: 14px;
    }
}