body {
    display: block;
    margin: 0px;background: #f6fbff;
}

.header-container {
    width: 100%;
    background: #fff;
}

.header-inner {
    max-width: 1000px;
    margin: 0 auto;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.mtis-logo {
  width: 320px;
  height: 50px;
  display: flex;
  align-items: center;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 600;
  overflow: hidden;
}

/* MTIS（橙色渐变） */
.mtis {
    font-size: 40px;
    margin-right: 6px;
    height: 50px;
    line-height: 52px;
    color: #EE7600;
    font-weight: 800;
}

/* 中文（红粉渐变） */
.cn {
  font-size: 32px;
    white-space: nowrap;
    color: #555555;
}

/* 导航 */
.header-nav {
    display: flex;
    gap: 15px;
}

.header-nav a {
    text-decoration: none;
    padding: 8px 20px;
    border: 1px solid #33CCCC;
    border-radius: 0px;
    color: #663300;
    font-size: 18px;border-radius: 5px;
}

.header-nav a:hover {
    background: #4db8ff;
    color: #fff;
    border-color: #4db8ff;
}

/* 移动端菜单按钮 */
.header-menu-btn {
    display: none;
    font-size: 30px;
    cursor: pointer;height: 30px;
    line-height: 25px;
}

/* 移动端菜单 */
.header-mobile-menu {
    display: none;
    flex-direction: column;
    padding: 10px 20px;
}

.header-mobile-menu a {
    margin: 8px 0;
    padding: 10px;
    border: 1px solid #bfe6ff;
    border-radius: 6px;
    text-decoration: none;
    color: #333;
}

.header-mobile-menu a:hover {
    background: #4db8ff;
    color: #fff;
}

/* 响应式 */
@media (max-width: 768px) {
    /* 必须 !important：JS 会给 .header-nav 设内联 display:flex，否则会盖住本规则并在窄屏把链接挤成竖条 */
    .header-nav {
        display: none !important;
    }
    .header-menu-btn {
        display: block;
    }
}


/* ================= 宣传板块模块 ================= */
.hero-container {
    width: 100%;
    background: #4298b4;
    padding: 50px 0px;
    text-align: center;
}

.hero-inner {
    max-width: 1000px;
    margin: 0 auto;
}

/* 主标题 */
.hero-title {
    font-size: 48px;
    font-weight: bold;
    color: #fff;text-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
}

.hero-title span {
    color: #007acc;
}

/* 副标题 */
.hero-subtitle {
    margin-top: 20px;
    font-size: 22px;
    color: #fff;text-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
}

/* 按钮 */
.hero-button {
    margin-top: 30px;
}

.hero-button a {
    display: inline-block;
    padding: 15px 50px;
    background:#FFF;
    color: #104E8B;
    border-radius: 5px;
    text-decoration: none;
    font-size: 26px;font-weight: bold;
    transition: all 0.3s;box-shadow: 0 0 100px rgba(255, 255, 255, 0.3);
}

.hero-button a:hover {
    background: #F8F8FF;
}

/* 描述 */
.hero-desc {
    margin-top: 20px;
    font-size: 14px;
    color: #666;
}

/* 移动端 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 28px;
    }
}
/* ================= 宣传数据模块（独立） ================= */
.hero-stats {
    margin-top: 50px;
    display: flex;
    justify-content: center;
    gap: 120px;
}

/* 每个数据块 */
.hero-stat-item {
    text-align: center;
}

/* 数字 */
.hero-stat-num {
    font-size: 40px;
    font-weight: bold;
    margin-bottom: 15px;text-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
}

/* 标签 */
.hero-stat-label {
    font-size: 25px;
    color: #ffffff;text-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
}

/* 三个不同颜色 */
.hero-stat-item:nth-child(1) .hero-stat-num {
    color: #FFD700;
}

.hero-stat-item:nth-child(2) .hero-stat-num {
    color: #00FFFF;
}

.hero-stat-item:nth-child(3) .hero-stat-num {
    color: #FFB6C1;
}

.hero-stat-item:nth-child(4) .hero-stat-num {
    color: 	#54FF9F;
}

/* 移动端 */
@media (max-width: 768px) {
    .hero-stats {
        flex-direction: column;
        gap: 25px;
    }

    .hero-stat-num {
        font-size: 32px;
    }
}


/* ================= 第三板块模块 ================= */
.section3-container {
    background: #f6fbff;
    padding: 50px 0px;
}

.section3-inner {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    gap: 40px;
    align-items: center;
}

/* 左侧图片 */
.section3-left {
    width: 35%;
}

.section3-left img {
    width: 100%;
    border-radius: 12px;
}

/* 右侧 */
.section3-right {

}

/* 介绍 */
.section3-intro {
    margin-bottom: 40px;
}

.section3-title {
    font-size: 35px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #666;text-align: center;
}

.section3-text {
    font-size: 17px;
    color: #555;
    line-height: 1.8;
}

/* 三类型区域 */
.section3-types {
    display: flex;
    gap: 20px;margin-top: 20px;
}

/* 卡片 */
.section3-type-item {
    flex: 1;
    padding: 20px;
    border-radius: 0px;
    background: #fff;
    border: 1px solid;
    transition: all 0.3s;
}

/* 名称 */
.type-name {
    font-size: 30px;
    font-weight: bold;
    margin-bottom: 5px;text-align: center;color:#666;
}

/* 字母 */
.type-code {
    font-size: 40px;
    font-weight: bold;
    margin-bottom: 10px;text-align: center;
}

/* 描述 */
.type-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.6;text-align: justify;
}

.type-d {
    border-color:#dbeeff;
}
.type-d .type-code {
    color: #4298b4;
}


/* 移动端 */
@media (max-width: 768px) {
    .section3-inner {
        flex-direction: column;
    }

    .section3-left,
    .section3-right {

    }

    .section3-types {
        flex-direction: column;
    }
}


/* ================= 第四板块模块 ================= */
.section4-container {
    width: 100%;
    background: #f6fbff;
}

.section4-inner {
    max-width: 1000px;
    margin: 0 auto;
}

/* 横幅图 */
.section4-banner {
    margin-bottom: 40px;
}

.section4-banner img {
    width: 100%;
    border-radius: 0px;
}



/* 主标题 */
.section4-title {
    font-size: 35px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 40px;
    color: #666;
}

/* 网格布局 */
.section4-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;margin-bottom: 20px;
}

/* 单个卡片 */
.section4-item {
    background: #f6fbff;
    padding: 20px;
    border-radius: 0px;
    text-align: center;
    border: 1px solid #dbeeff;
}



/* 图标 */
.section4-item img {
    width: 100%;height: 150px;
    margin-bottom: 15px;
}

/* 标题 */
.section4-item-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
}

/* 描述 */
.section4-item-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.6;text-align: justify;
}

/* 移动端 */
@media (max-width: 768px) {
    .section4-grid {
        grid-template-columns: 1fr;
    }
}
}

/* ================= 常见帮助模块 ================= */
.faq-container {
    width: 100%;
    background: #f7fbff;
    padding: 80px 0;
}

.faq-inner {
    width: 1000px;
    margin: 0 auto;
}

/* 主标题 */
.faq-main-title {
    text-align: center;
    font-size: 32px;
    font-weight: bold;
    color: #222;
    margin-bottom: 50px;
}

/* 网格布局 */
.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* 单个问答 */
.faq-item {
    background: #ffffff;
    border: 1px solid #dbeeff;
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s;
}

/* hover */
.faq-item:hover {
    border-color: #8fd3ff;
    box-shadow: 0 8px 25px rgba(0,0,0,0.05);
}

/* 问题 */
.faq-question {
    font-size: 18px;
    font-weight: bold;
    color: #222;
    margin-bottom: 18px;
}

/* 横线 */
.faq-line {
    width: 100%;
    height: 1px;
    background: #e8f3ff;
    margin-bottom: 18px;
}

/* 回答 */
.faq-answer {
    font-size: 15px;
    line-height: 1.8;
    color: #666;
}

.footer-container {
    width: 100%;
    background: #1f2a36;
    padding: 35px 0;margin-top: 20px;
}

/* 内容区域 */
.footer-inner {
    width: 1000px;
    margin: 0 auto;
    text-align: center;
}

/* 第一行 */
.footer-copy {
    font-size: 14px;
    color: #d6e4f0;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

/* 第二行 */
.footer-email {
    font-size: 14px;
    color: #8fa8bd;
}



















/* ================= 移动端整体适配 ================= */
@media screen and (max-width: 768px) {

    body {
        overflow-x: hidden;
    }

    /* ================= 顶部导航 ================= */

    .header-inner {
        width: auto;
        height: 70px;
        padding: 0 15px;
    }

    .mtis-logo {
        width: auto;
        height: auto;
    }

    .mtis {
        font-size: 28px;

    }

    .cn {
        font-size: 23px;height: 30px;
    line-height: 32px;
    }

    .header-nav {
        display: none !important;
    }

    .header-menu-btn {
        display: block;
        color: #333;
    }

    .header-mobile-menu {
        padding: 10px 15px;
    }

    .header-mobile-menu a {
        font-size: 16px;
    }


    /* ================= 宣传区 ================= */

    .hero-container {
        padding: 0px;
    }

    .hero-inner {
        padding: 20px;
    }

    .hero-title {
        font-size: 32px;
        line-height: 1.4;margin-top: 10px;
    }

    .hero-subtitle {
        font-size: 16px;
        line-height: 1.8;
        margin-top: 15px;
    }

    .hero-button a {
        font-size: 22px;
        padding: 12px 28px;border-radius: 10px;
    }
    
    .hero-button {
    margin-top: 20px;
}

    /* 数据统计 */
    .hero-stats {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px 10px;
        margin-top: 20px;
    }

    .hero-stat-num {
        font-size: 28px;margin-bottom: 5px;
    }

    .hero-stat-label {
        font-size: 18px;
    }


    /* ================= 第三板块 ================= */

    .section3-container {
        padding: 20px;
    }

    .section3-inner {
        width: 100%;
        flex-direction: column;
        gap: 25px;
    }

    .section3-left {
        width: 100%;
    }

    .section3-right {

    }

    .section3-title {
        font-size: 28px;
        line-height: 1.5;
    }

    .section3-text {
        font-size: 16px;
        line-height: 1.9;    text-align: justify;
    }
    
    .section3-intro {
    margin-bottom: 20px;
}

    /* 类型卡片 */
    .section3-types {
gap: 10px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);    margin-top: 10px;
    }

    .section3-type-item {
        padding: 10px;
    }

    .type-name {
        font-size: 20px;
    }

    .type-code {
        font-size: 25px;
    }

    .type-desc {
        font-size: 14px;
        line-height: 1.5;
    }


    /* ================= 第四板块 ================= */

    .section4-container {
        padding: 0 15px;
        box-sizing: border-box;
    }

    .section4-inner {
        width: 100%;
    }

    .section4-title {
        font-size: 28px;
        margin-bottom: 30px;
        line-height: 1.5;
    }

    /* 应用场景卡片 */
    .section4-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .section4-item {
        padding: 15px;
    }

    .section4-item img {
        height: 100px;
        object-fit: cover;
    }

    .section4-item-title {
        font-size: 16px;
    }

    .section4-item-desc {
        font-size: 13px;
        line-height: 1.7;
    }


    /* ================= FAQ帮助 ================= */

    .faq-container {
        padding: 0px 0;
    }

    .faq-inner {
        width: 100%;
    }

    .faq-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .faq-item {
        padding: 18px;
        border-radius: 8px;
    }

    .faq-question {
        font-size: 17px;
        line-height: 1.6;
    }

    .faq-answer {
        font-size: 14px;
        line-height: 1.9;
    }


    /* ================= 底部 ================= */

    .footer-container {
        padding: 0px;
    }

    .footer-inner {
            width: 90%;
    padding: 5% 5%;
    }

    .footer-copy {
        font-size: 13px;
        line-height: 1.8;
    }

    .footer-email {
        font-size: 13px;
        line-height: 1.8;
    }

}