@media (max-width: 1080px) {
  .nav {
    gap: 20px;
  }
}

@media (max-width: 768px) {
  /* ========== 收缩菜单 ========== */
  .nav-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 28px;
    margin-bottom: 8px;
    cursor: pointer;
  }

  .logo-nav {
    display: flex;
    justify-content: space-between;
    width: 100%;
  }

  .nav {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 10px;
    flex-wrap: wrap;
  }
  .nav.nav-open {
    display: flex;
  }

  /* ========== 头部导航 ========== */
  .header {
    height: auto;
    padding: 16px 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .logo-group {
    width: 200px;
  }

  .nav-toggle {
    display: block;
  }

  .nav a {
    font-size: 18px;
  }

  .banner-img {
    width: 100%;
    display: block;
    height: 320px;
    object-fit: cover;
  }

  .banner h1 {
    font-size: 22px;
    line-height: 1.4;
  }

  .banner p {
    font-size: 14px;
    line-height: 1.6;
  }

  /* ========== 通用区块 ========== */
  .section {
    padding: 48px 20px;
  }

  .section-header {
    margin-bottom: 24px;
  }

  .section-title {
    font-size: 28px;
    margin-bottom: 4px;
  }

  .section-en {
    font-size: 16px;
    margin-left: 0;
  }

  /* ========== 公司介绍 ========== */
  .company-desc {
    font-size: 14px;
    line-height: 26px;
    margin-bottom: 24px;
  }

  .company-img {
    height: 240px;
    object-fit: cover;
  }

  /* ========== 核心业务 ========== */
  .business-list {
    flex-direction: column;
    gap: 32px;
    margin-top: 0;
  }

  .business-item {
    width: 100%;
  }

  .business-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 14px;
  }

  .business-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
  }

  .business-item .intro {
    font-size: 14px;
    line-height: 24px;
    margin-bottom: 12px;
  }

  .business-item .tag {
    font-size: 13px;
  }

  /* ========== 企业优势 ========== */
  .advantage {
    padding: 48px 20px;
  }

  .advantage-title {
    font-size: 28px;
    margin-bottom: 14px;
  }

  .advantage-sub {
    font-size: 14px;
    line-height: 28px;
    margin-bottom: 32px;
  }

  .advantage-cards {
    flex-direction: column;
    gap: 16px;
    padding: 0;
  }

  .advantage-card {
    width: 100%;
    height: auto;
    padding: 20px;
  }

  .advantage-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
  }

  .advantage-card p {
    font-size: 14px;
    line-height: 24px;
  }

  /* ========== 产品展示 ========== */
  .product-list {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .product-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  /* ========== 联系我们 ========== */
  .contact {
    flex-direction: column;
    gap: 40px;
  }

  .contact-info {
    padding-top: 20px;
    padding-left: 20px;
    padding-right: 20px;
    width: 100%;
  }

  .contact-info h2 {
    font-size: 28px;
    margin-bottom: 30px;
  }

  .contact-item {
    margin: 20px 0;
  }

  .contact-item .label {
    font-size: 16px;
  }

  .contact-item .text {
    font-size: 18px;
    word-break: break-all;
  }

  .contact-img {
    width: 100%;
    height: auto;
    min-height: 160px;
    padding: 0 20px;
  }

  .map-group {
    width: 100%;
    height: auto;
  }

  .map-group-box {
    width: 100%;
    height: auto;
    padding: 16px;
    gap: 12px;
    flex-wrap: wrap;
  }

  .map-group-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
  }

  .map-icon {
    width: 28px;
    height: 36px;
  }

  .map-text {
    width: calc(100% - 60px);
    font-size: 12px;
  }

  .map-label {
    font-size: 12px;
    line-height: 20px;
  }

  /* ========== 底部 ========== */
  .footer {
    padding: 40px 20px;
  }

  .footer-logo {
    width: 120px;
    height: 100px;
    margin-bottom: 24px;
    background-size: contain;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 24px;
    justify-content: center;
    margin-bottom: 32px;
  }

  .footer-nav a {
    font-size: 14px;
  }

  .footer-line {
    width: 100%;
    margin-bottom: 24px;
  }

  .footer-social {
    gap: 24px;
    margin-bottom: 20px;
  }

  .social-icon {
    width: 30px;
    height: 30px;
  }

  .footer-copyright {
    font-size: 10px;
    line-height: 1.6;
    word-break: break-word;
  }
}