.container {
  max-width: var(--container-max); 
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px);
}



#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h); 
  background: #edf4ff;
}



.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: none;
  padding: 0 40px;
}



.brand {
  display: flex;
  align-items: flex-end;
  gap: 4.8px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand img {
  height: 40px;
  width: auto;
  display: block;
}


.nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 60px; 
  list-style: none;
  margin: 0;
  padding: 0;
}



.nav-item {
  position: relative;
  padding: 15px 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 18px;
  font-weight: 600; 
  line-height: 1;
  color: #000;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.2s;
}

.nav-link:hover,
.nav-item.is-active > .nav-link {
  color: var(--color-primary); 
}


.dd-arrow {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.2s;
}

.has-dd:hover .dd-arrow,
.has-dd:focus-within .dd-arrow {
  transform: rotate(-135deg) translateY(-2px);
}



.dd {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 180px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(169, 190, 222, 0.3);
  padding: 6px;
  z-index: 200;
}

.has-dd:hover .dd,
.has-dd:focus-within .dd {
  display: flex;
  flex-direction: column;
  gap: 4px;
}


.dd:empty {
  display: none !important;
}



.dd-item {
  display: block;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 18px;
  font-weight: 400;
  line-height: 26px;
  color: var(--color-text); 
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}

.dd-item:hover {
  background: #e3efff;
  color: var(--color-primary); 
}


.dd-item-icon {
  display: flex;
  align-items: center;
  gap: 10px;
}
.dd-item-icon-img {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  background: url('../assets/icons/tab-telecom.png?t=20260720160142') center / contain no-repeat;
}

.dd-item:hover .dd-item-icon-img {
  background-image: url('../assets/icons/tab-telecom--active.png?t=20260720160142');
}


.nav-toggle {
  display: none;
}


@media (max-width: 767px) {
  
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 300;
    flex-shrink: 0;
    
    -webkit-appearance: none;
    appearance: none;
  }

  .nav-toggle span {
    display: block;
    width: 100%;            
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
  }

  
  body.nav-open .nav-toggle span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  body.nav-open .nav-toggle span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }
  body.nav-open .nav-toggle span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  
  .nav {
    position: fixed;
    top: var(--header-h, 80px);
    right: 0;
    bottom: 0;
    width: 80vw;
    max-width: 320px;
    background: #edf4ff;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.12);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    z-index: 200;
    flex: unset;
    justify-content: unset;
  }

  
  body.nav-open .nav {
    transform: translateX(0);
  }

  
  .nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 150;
  }

  body.nav-open .nav-overlay {
    display: block;
  }

  
  body.nav-open {
    overflow: hidden;
  }

  
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 0;
  }

  .nav-item {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  }

  .nav-link {
    display: flex;
    justify-content: space-between;
    padding: 14px 20px;
    font-size: 16px;
  }

  
  .has-dd .dd {
    display: none;
    position: static;
    box-shadow: none;
    border-radius: 0;
    padding: 0;
    min-width: unset;
    background: rgba(2, 100, 253, 0.04);
  }

  
  .has-dd.dd-open .dd {
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  .has-dd.dd-open .dd-arrow {
    transform: rotate(-135deg) translateY(-2px);
  }

  
  .has-dd .dd .dd-item {
    padding: 12px 20px 12px 32px;
    font-size: 15px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  }

}


@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}




#site-footer {
  background: #ffffff;
}


.footer-inner {
  display: flex;
  gap: 70px; 
  padding-top: 100px;
  padding-bottom: 60px;
}



.footer-brand {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 400px;
}

.footer-logo {
  display: block;
  line-height: 0;
}

.footer-logo img {
  height: 40px;
  width: auto;
}


.footer-slogan {
  font-size: 16px;
  color: #5a5f6c;
  letter-spacing: 5px;
  white-space: nowrap;
  margin: 0;
  margin-top: 4px;
}


.footer-qrcode-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 10px;
}


.footer-qrcode-box {
  width: 88px;
  height: 88px;
  background: #fff;
  border: 1px solid #dcdfe6;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.footer-qrcode-box img {
  width: 80px;
  height: 80px;
  border-radius: 9px;
  object-fit: cover;
}


.footer-qrcode-label {
  font-size: 12px;
  color: #5a5f6c;
  letter-spacing: 0.5px;
  line-height: 20px;
  margin: 0;
}


.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.footer-contact p {
  font-size: 16px;
  color: #2c3034;
  letter-spacing: 0.5px;
  line-height: 30px;
  margin: 0;
}



.footer-nav {
  flex: 1;
  display: flex;
  gap: 70px;
  justify-content: flex-end;
  padding-top: 0; 
}


.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}


.footer-col-title {
  font-size: 14px;
  font-weight: 400;
  color: #5a5f6c;
  line-height: 30px;
  margin: 0;
  white-space: nowrap;
}


.footer-col-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}


.footer-col-links .span {
  font-size: 16px;
  font-weight: 400;
  color: #2c3034;
  text-decoration: none;
  line-height: 30px;
  white-space: nowrap;
  transition: color 0.15s;
  cursor: pointer;
}

.footer-col-links .span:hover {
  color: var(--color-primary); 
}


.footer-col-links .span.footer-link-primary {
  color: var(--color-primary);
}



.footer-divider {
  width: 100%;
  height: 1px;
  background: #dcdfe6;
}



.footer-beian {
  text-align: center;
  padding: 20px 0 30px;
}

.footer-beian p {
  font-size: 15px;
  font-weight: 400;
  color: #8a90a1;
  line-height: 1.6;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 4px;
}

.footer-beian a {
  color: #8a90a1;
  text-decoration: none;
  transition: color 0.15s;
}

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



@media (max-width: 767px) {
  .footer-inner {
    flex-direction: column;
    gap: 40px;
    padding-top: 48px;
  }

  .footer-brand {
    width: 100%;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 28px;
    justify-content: flex-start;
  }

  .footer-contact p {
    white-space: normal;
  }

  .footer-slogan {
    letter-spacing: 4px;
  }

  .footer-beian p {
    font-size: 14px;
    flex-direction: column;
    gap: 6px;
  }
}