:root {
    --color-primary-dark: #164782;
    --color-primary: #2367b2;
    --color-accent-blue: #3482d8;
    --color-dark-bg: #192838;
    --color-text-dark: #222831;
    --color-text-light: #ffffff;
    --color-text-gray: #606873;
    --color-border-gray: #dee2e6;
    --container-max: 1260px;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Roboto', Arial, Helvetica, sans-serif;
    color: var(--color-text-dark);
    line-height: 1.55;
    overflow-x: hidden;
}
ul {
    list-style: none;
}
a {
    text-decoration: none;
    color: inherit;
}
img {
    max-width: 100%;
    display: block;
}
.container {
    width: 92%;
    max-width: var(--container-max);
    margin: 0 auto;
}
.text--blue {
    color: var(--color-accent-blue);
}
.section-head {
    text-align: center;
    margin-bottom: 48px;
}
.section-head h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-dark-bg);
    text-transform: uppercase;
}
.section-head__divider {
    width: 45px;
    height: 3px;
    background: var(--color-primary);
    display: block;
    margin: 10px auto 0;
}

/* 按钮 BEM */
.btn {
    display: inline-block;
    padding: 11px 22px;
    border-radius: 2px;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
}
.btn--primary {
    background-color: var(--color-primary);
    color: #fff;
}
.btn--primary:hover {
    background-color: var(--color-primary-dark);
}
.btn--outline {
    background: transparent;
    color: var(--color-primary-dark);
    border: 2px solid var(--color-primary);
}
.btn--outline:hover {
    background: var(--color-primary);
    color: white;
}
.btn--full {
    width: 100%;
}

/* header 头部模块 */
.header {
    background: #fff;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 999;
}
.header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
}
.header__logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
.header__logo-icon {

     display: flex;
    align-items: center;
    justify-content: center;


    
    font-size: 28px;
    color: var(--color-primary-dark);
}
.header__logo-text strong {
    display: block;
    font-size: 18px;
    letter-spacing: 0.5px;
    color: var(--color-dark-bg);
}
.header__logo-text span {
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--color-text-gray);
}
.header__nav {
    display: flex;
    align-items: center;
    gap: 28px;
}
.header__menu {
    display: flex;
    gap: 26px;
}
.header__menu-link {
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    color: var(--color-dark-bg);
}
.header__menu-link--active {
    color: var(--color-primary);
}
.header__mobile-btn {
    display: none;
    border: none;
    background: none;
    font-size: 24px;
}





/* footer页脚 */
.footer {
    background:#0f1a26;
    color:#b8c2cc;
    padding:50px 0 24px;
}
.footer__inner {
    display: grid;
    grid-template-columns:2.2fr repeat(3,1fr);
    gap:32px;
    margin-bottom:36px;
}
.footer__logo {
    display:flex;
    align-items:center;
    gap:10px;
    margin-bottom:14px;
}
.footer__logo-icon {
    font-size:28px;
    color: var(--color-primary-dark);
}
.footer__logo-text strong {
    display:block;
    font-size:18px;
    color:#fff;
}
.footer__logo-text span {
    font-size:11px;
    color:#b8c2cc;
}
.footer__col h4 {
    color:#fff;
    font-size:16px;
    margin-bottom:16px;
    text-transform:uppercase;
}
.footer__list-item {
    margin-bottom:8px;
    font-size:14px;
}
.footer__list-item a:hover {
    color:var(--color-accent-blue);
}
.footer__bottom {
    border-top:1px solid #283849;
    padding-top:18px;
    font-size:13px;
}

/* 响应式 */
@media(max-width:1100px) {
    .app-section__grid {
        grid-template-columns: repeat(3,1fr);
    }
    .advantage-section__grid {
        grid-template-columns: repeat(3,1fr);
    }
}
@media(max-width:920px) {
    .header__menu {
        display: none;
    }
    .header__mobile-btn {
        display:block;
    }
    .feature__grid {
        grid-template-columns: repeat(2,1fr);
    }
    .cta-section__wrap {
        grid-template-columns: 1fr;
    }
    .footer__inner {
        grid-template-columns: repeat(2,1fr);
    }
}
@media(max-width:640px) {
    .hero__text h1 {
        font-size:30px;
    }
    .app-section__grid {
        grid-template-columns: 1fr;
    }
    .advantage-section__grid {
        grid-template-columns: 1fr;
    }
    .feature__grid {
        grid-template-columns: 1fr;
    }
    .cta-form__row--2col {
        grid-template-columns: 1fr;
    }
    .footer__inner {
        grid-template-columns: 1fr;
    }
    .hero {
        min-height:500px;
    }
}



















.header__dropdown {
  position: absolute;
  top: 100%;
/*   left: 0; */
  min-width: 200px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  list-style: none;
  padding: 10px 0;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.25s ease;
  border-radius: 4px;
  z-index: 999;
}
.header__menu-item--dropdown:hover .header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.header__dropdown li a {
  display: block;
  padding: 10px 18px;
  text-decoration: none;
  color: #333;
}
.header__dropdown li a:hover {
  background-color: #f5f7fa;
  color:#2563eb;
}


.mobile-nav__dropdown {
  list-style: none;
  padding:0;
  margin:0;
  max-height:0;
  overflow:hidden;
  transition:max-height 0.25s ease;
  background:#f9fafc;
}
.mobile-nav__dropdown.open {
  max-height: 300px;
}
.mobile-nav__dropdown li a {
  display:block;
  padding:12px 32px;
  text-decoration:none;
  color:#444;
  border-bottom:1px solid #eee;
}


/* ========== 响应式断点 768px ========== */
@media (max-width: 768px) {
  .header__inner {
    height: 70px;
  }

  .header__nav {
    display: none;
  }

  .header__mobile-btn {
    display: block;
  }

  .mobile-nav {
    top: 70px;
  }
}





/* ========== 独立移动端导航（默认隐藏） ========== */
.mobile-nav {
  position: absolute;
  top: 80px;
  left: 0;
  width: 100%;
  background: #ffffff;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all 0.32s ease;
  z-index: 998;
  padding: 20px 0;
}

.mobile-nav.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav__menu {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav__item {
  border-bottom: 1px solid #f0f0f0;
}

.mobile-nav__link {
  display: block;
  padding: 16px 20px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

.mobile-nav__link--active {
  color: #2563eb;
}

.mobile-nav__quote {
  margin: 20px 20px 0;
  display: block;
  text-align: center;
}

/* ========== 响应式断点 768px ========== */
@media (max-width: 768px) {
  .header__inner {
    height: 70px;
  }

  /* 手机下隐藏桌面导航 */
  .desktop-nav {
    display: none;
  }

  /* 显示汉堡按钮 */
  .header__mobile-btn {
    display: block;
  }

  .mobile-nav {
    top: 70px;
  }
}






.footer-qrcodes {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

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

.footer-qrcode img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    background: #fff;
    padding: 5px;
    border-radius: 4px;
}

.footer-qrcode span {
    display: block;
    margin-top: 7px;
    font-size: 13px;
    color: #aaa;
}