/* CSS 变量定义 */
:root {
    --primary-blue: #005BAC; /* 主色调深蓝 */
    --light-blue: #4A90D9;  /* 辅助浅蓝 */
    --text-dark: #1A1A1A;
    --text-gray: #999999;
    --bg-white: #FFFFFF;
}

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    background-color: var(--bg-white);
    color: var(--text-dark);
    overflow-x: hidden;
}
.product-banner {
    width: 100%;
}
.container {
    width: 100%;
    min-height: 100vh;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
}

a {
    text-decoration: none;
    color: inherit;
}

/* 背景水印文字样式 */
.bg-text {
    position: absolute;
    font-size: 18vw;
    font-weight: 900;
    opacity: 0.08;
    color: var(--text-dark);
    z-index: 0;
    line-height: 1;
    pointer-events: none;
    white-space: nowrap;
}

.top-left {
    top: 0;
    left: -5%;
    transform: rotate(-15deg);
}

.bottom-right {
        bottom: calc(10vw + 32px);
    right: 2%;
    transform: rotate(15deg) scaleX(-1);
}



/* 头部区域：Logo 和导航 - 参考截图设计 */
.site-header {
    width: 100%;
    padding: 25px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 10;
}

.logo-area {
    display: flex;
    align-items: center;
}

.logo-area img {
    height: 55px;
    width: auto;
}

/* 导航菜单 - 完全参考截图样式 */
.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 50px;
    align-items: center;
}

.nav-menu a {
    font-size: 16px;
    color: #333333;  /* 默认颜色：深灰色/黑色（参考截图）*/
    font-weight: 400;
    letter-spacing: 2px;
    position: relative;
    padding-bottom: 8px;
    transition: all 0.3s ease;
}

/* 首页激活状态 - 蓝色文字和蓝色下划线 */
.nav-menu a.active {
    color: #1e5ba8;  /* 选中状态：蓝色（参考截图）*/
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: #1e5ba8;  /* 下划线：蓝色 */
}

/* 悬停效果 */
.nav-menu a:hover {
    color: #1e5ba8;  /* 悬停时变为蓝色 */
}

.nav-menu a:hover::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: #1e5ba8;  /* 悬停下划线：蓝色 */
}

/* 主体内容区域 */
main {
    text-align: center;
    z-index: 10;
    /*margin-top: 80px;*/
    /*margin-bottom: 80px;*/
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.main-title {
    font-size: 56px;
    font-weight: bold;
    letter-spacing: 8px;
    color: var(--text-dark);
    margin-bottom: 20px;
    line-height: 1.3;
}

.sub-title {
    font-size: 18px;
    color: var(--text-gray);
    letter-spacing: 3px;
    margin-bottom: 45px;
    text-transform: uppercase;
    font-weight: 300;
}

/* 蓝色标语条 - 完全参考官网设计 */
.banner {
    background-color: #1a5ba8;
    color: white;
    padding: 16px 50px;
    font-size: 17px;
    letter-spacing: 4px;
    font-weight: 400;
    display: inline-block;
    position: relative;
}

.banner::before {
    content: '';
    position: absolute;
    right: -50px;
    top: 0;
    width: 50px;
    height: 100%;
    background-color: #E0E0E0;
}

/* 底部核心定位 */
footer {
    text-align: center;
    z-index: 10;
    padding-bottom: 20px;
}

.footer-tagline {
    font-size: 22px;
    color: var(--primary-blue);
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.footer-desc {
    font-size: 13px;
    color: var(--text-gray);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* 蓝色联系信息栏 - 完全参考官网设计 */
.contact-bar {
    width: 100%;
    background-color: #1a5ba8;
    padding: 22px 50px;
    color: white;
    z-index: 10;
}

.contact-info {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 30px;
    font-size: 14px;
}

.contact-info span {
    white-space: nowrap;
}

.contact-info a {
    color: white;
    transition: opacity 0.3s ease;
}

.contact-info a:hover {
    opacity: 0.7;
}

/* ICP备案号 */
.icp-footer {
    width: 100%;
    text-align: center;
    padding: 18px 20px;
    font-size: 12px;
    color: #666;
    background-color: #f9f9f9;
}

.icp-footer a {
    color: #666;
    transition: color 0.3s ease;
}

.icp-footer a:hover {
    color: var(--primary-blue);
}

/* 响应式调整 */
@media (max-width: 1024px) {
    .main-title {
        font-size: 42px;
        letter-spacing: 6px;
    }

    .banner {
        padding: 14px 40px;
        font-size: 16px;
        letter-spacing: 3px;
    }

    .contact-info {
        gap: 20px;
        font-size: 13px;
    }

    .nav-menu ul {
        gap: 35px;
    }

    .site-header {
        padding: 25px 30px;
    }
}

@media (max-width: 768px) {
    .site-header {
        flex-direction: column;
        gap: 20px;
        padding: 25px 5%;
    }

    .nav-menu ul {
        gap: 25px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-menu a {
        font-size: 15px;
    }

    main {
        /*margin-top: 40px;*/
        /*margin-bottom: 50px;*/
    }

    .main-title {
        font-size: 32px;
        letter-spacing: 4px;
    }

    .sub-title {
        font-size: 14px;
        letter-spacing: 2px;
        margin-bottom: 30px;
    }

    .banner {
        padding: 12px 20px;
        font-size: 1rem;
    }

    .banner::before {
        display: none;
    }

    .footer-tagline {
        font-size: 18px;
    }

    .footer-desc {
        font-size: 11px;
        letter-spacing: 1px;
    }

    .contact-bar {
        padding: 18px 20px;
    }

    .contact-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        font-size: 12px;
    }


    .bg-text {
        font-size: 22vw;
    }
}