/* =====================================================
   上海铂米瑞光电技术有限公司 — 响应式断点
   ===================================================== */

/* 小平板 / 大屏手机 */
@media (min-width: 576px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .news-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 平板 */
@media (min-width: 768px) {
  .hero {
    padding: calc(var(--space-2xl) + 32px) 0;
  }

  .hero h1 {
    font-size: 3rem;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .product-categories {
    grid-template-columns: repeat(2, 1fr);
  }

  .support-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  /* 头部导航切换为横向 */
  .menu-toggle {
    display: none;
  }

  .primary-nav {
    position: static;
    transform: none;
    padding: 0;
    background: transparent;
    overflow: visible;
    width: auto;
  }

  .nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
  }

  .nav-list a, .nav-list button {
    width: auto;
    padding: 8px 0;
    font-size: 0.82rem;
    letter-spacing: var(--letter-spacing-wide);
  }

  .has-dropdown {
    position: relative;
  }

  .dropdown {
    position: absolute;
    top: calc(100% + 16px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 260px;
    background-color: #FFFFFF;
    border-radius: var(--radius-md);
    box-shadow: 0 12px 40px rgba(10, 22, 40, 0.15);
    padding: var(--space-md);
    display: none;
  }

  .has-dropdown:hover .dropdown,
  .has-dropdown:focus-within .dropdown,
  .dropdown.open {
    display: block;
  }

  .dropdown::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #FFFFFF;
  }

  .dropdown .dropdown__group-title {
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    margin-bottom: 4px;
  }

  .dropdown a {
    color: var(--text-primary);
    padding: 8px 0;
  }

  .dropdown a:hover, .dropdown a:focus {
    color: var(--accent);
  }

  .lang-switcher--desktop {
    display: flex;
  }

  .lang-switcher--mobile {
    display: none;
  }

  /* 产品详情布局：左小右大 */
  .product-detail__grid {
    grid-template-columns: 320px 1fr;
    gap: var(--space-xl);
  }

  .application-intro {
    grid-template-columns: 1fr 1fr;
  }

  .about-story {
    grid-template-columns: 1fr 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
  }
}

/* 大屏桌面 */
@media (min-width: 1200px) {
  .product-detail__grid {
    grid-template-columns: 360px 1fr;
    gap: 64px;
  }

  .card-grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .card-grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .application-features {
    grid-template-columns: repeat(3, 1fr);
  }

  .values-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .product-categories {
    grid-template-columns: repeat(3, 1fr);
  }
}