/* 设置颜色变量 */
:root {
    --primary-color: #F2693B;  /* 主色调：橙色 */
    --dark-blue: #13274B;      /* 深蓝色 */
    --light-blue: #0F2C52;     /* 浅蓝色 */
    --text-color: #24282D;     /* 文字颜色 */
    --white: #FFFFFF;          /* 白色 */
    --light-gray: #F5F5F5;     /* 浅灰色 */
    --dark-gray: #EEEEEE;      /* 深灰色 */
    --footer-color: #24282D;   /* 页脚颜色 */
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', 'Source Han Sans', sans-serif;
    color: var(--text-color);
    line-height: 1.5;
    font-size: 16px;
    background-color: var(--white);
}

.container {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 15px;
}

img {
    max-width: 100%;
    height: auto;
}

/* 头部样式 */
.masthead {
    width: 100%;
    height: 122px;
}

.main-header {
    width: 100%;
    height: 122px;
    background-color: var(--white);
    box-shadow: 0px 2px 0px 0px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
}

.main-header-inner {
    display: flex;
    align-items: center;
    height: 100%;
}

.logo-link {
    display: inline-block;
}

.default-logo {
    width: 136px;
    height: auto;
    margin-top: 5px;
}

.primary-menu {
    margin-left: auto;
}

.menu {
    display: flex;
    list-style: none;
    justify-content: flex-end;
}

.menu li {
    position: relative;
    margin: 0 10px;
}

.menu a {
    display: block;
    padding: 0 25px;
    height: 72px;
    line-height: 72px;
    text-decoration: none;
    color: #0F2D52;
    font-size: 14px;
    font-weight: 400;
    text-transform: uppercase;
    transition: color 0.3s;
}

.menu a::after {
    content: '';
    position: absolute;
    top: 35px;
    right: 12px;
    width: 8px;
    height: 8px;
    border-style: solid;
    border-width: 4px 4px 0 0;
    border-color: transparent;
    border-top-color: #0F2D52;
}

.menu a:hover, .menu a.active {
    color: var(--primary-color);
}

.menu a.active::after {
    border-top-color: var(--primary-color);
}

/* 横幅区域样式 */
.mt4-banner {
    padding-top: 122px;
    position: relative;
    background-color: var(--white);
    overflow: hidden;
    min-height: 580px;
}

.mt4-banner-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 370px;
    background-image: url('images/bg.png');
    background-size: cover;
    background-position: center;
    z-index: 1;
}

.mt4-banner-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 70%;
    height: 100%;
    background: linear-gradient(90deg, #EAEAEA, rgba(234, 234, 234, 0.5));
    z-index: 2;
}

.banner-content {
    position: relative;
    z-index: 3;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 50px;
}

.mt4-banner-left {
    width: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 364px;
}

.mt4-banner-left-content {
    padding: 50px 0;
}

.logo-text {
    width: 160px;
    height: auto;
}

.banner-title {
    font-size: 52px;
    font-weight: 700;
    color: var(--text-color);
    margin-top: 30px;
    line-height: 1.1;
}

.banner-subtitle {
    margin-top: 50px;
}

.banner-subtitle h3 {
    font-size: 24px;
    font-weight: 400;
    color: var(--dark-blue);
    line-height: 1.2;
}

/* 表单区域 */
.mt4-form-wrapper {
    width: 470px;
    background-color: var(--light-gray);
    padding: 30px 20px;
    border-radius: 5px;
}

.mt4-form-title {
    font-size: 32px;
    font-weight: 400;
    color: var(--light-blue);
    margin-bottom: 50px;
    padding-left: 30px;
    border-left: 10px solid var(--light-blue);
    line-height: 1.8;
}

.sbt-progress-btn {
    width: 100%;
    padding: 0 40px;
}

a.submit-btn {
    display: block;
    width: 100%;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
    text-align: center;
    line-height: 50px;
    text-decoration: none;
}

a.submit-btn:hover {
    background-color: #e05a2f;
}

/* 设备展示部分 */
.mt4-section {
    padding: 60px 0;
}

.mt4-section-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mt4-text-content {
    width: 48%;
}

.mt4-image {
    width: 48%;
    text-align: center;
}

.section-title {
    font-size: 32px;
    font-weight: 400;
    color: var(--text-color);
    margin-bottom: 35px;
}

.section-desc {
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-color);
}

.mt4-section.reverse .mt4-section-content {
    flex-direction: row-reverse;
}

/* 分隔线 */
.atfx-divider {
    width: 80px;
    height: 4px;
    background: transparent;
    border-top: 4px dashed var(--primary-color);
    margin: 40px auto;
    border-radius: 10px;
}

/* 介绍文本部分 */
.mt4-intro {
    padding: 40px 0;
}

.text-center {
    text-align: center;
}

.intro-text {
    margin-bottom: 16px;
    text-align: center;
    font-size: 16px;
    line-height: 1.5;
}

/* FAQ部分 */
.mt4-faq {
    padding: 40px 0;
}

.faq-accordion {
    margin-top: 30px;
}

.faq-item {
    border-top: 1px solid var(--white);
    background-color: var(--light-gray);
}

.faq-question {
    position: relative;
    padding: 16px 20px;
    font-size: 18px;
    font-weight: 400;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after,
.faq-question::before {
    content: '';
    position: absolute;
    right: 20px;
    top: 50%;
    width: 10px;
    height: 2px;
    background-color: var(--primary-color);
    transform: rotate(45deg);
}

.faq-question::after {
    transform: rotate(135deg);
    right: 27px;
}

.faq-answer {
    padding: 0 20px;
    height: 0;
    overflow: hidden;
    transition: height 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 20px 20px;
    height: auto;
}

.faq-item.active .faq-question::before {
    transform: rotate(-45deg);
}

.faq-item.active .faq-question::after {
    transform: rotate(-135deg);
}

/* 页脚 */
.main-footer {
    background-color: var(--footer-color);
    padding: 70px 0;
    color: var(--dark-gray);
    text-align: center;
}

.footer-text {
    font-size: 12px;
}

/* 响应式设计 */
@media (max-width: 991px) {
    .container {
        padding: 0 20px;
    }

    .banner-content {
        flex-direction: column;
    }

    .mt4-banner-left {
        width: 100%;
        height: auto;
        text-align: center;
    }

    .mt4-banner-left-content {
        padding: 30px 0;
    }

    .mt4-form-wrapper {
        width: 100%;
        margin-top: 30px;
    }

    .mt4-section-content {
        flex-direction: column;
    }

    .mt4-section.reverse .mt4-section-content {
        flex-direction: column;
    }

    .mt4-text-content, .mt4-image {
        width: 100%;
        text-align: center;
    }

    .mt4-image {
        margin-top: 30px;
        order: 2;
    }

    .mt4-text-content {
        order: 1;
    }
}

@media (max-width: 767px) {
    .main-header {
        height: auto;
    }

    .main-header-inner {
        flex-direction: column;
        padding: 15px 0;
    }

    .primary-menu {
        margin: 15px 0 0;
        width: 100%;
    }

    .menu {
        flex-direction: column;
        width: 100%;
    }

    .menu a {
        height: 50px;
        line-height: 50px;
        text-align: center;
    }

    .menu a::after {
        display: none;
    }

    .mt4-banner {
        padding-top: 200px;
    }

    .banner-title {
        font-size: 36px;
    }

    .banner-subtitle h3 {
        font-size: 20px;
    }

    .mt4-form-title {
        font-size: 28px;
        padding-left: 20px;
    }

    .section-title {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .banner-title {
        font-size: 32px;
    }

    .banner-subtitle h3 {
        font-size: 18px;
    }

    .mt4-form-title {
        font-size: 24px;
    }

    .section-title {
        font-size: 24px;
    }

    .sbt-progress-btn {
        padding: 0 20px;
    }
}