/* ==========================================================================
   华金精铸官网 - 响应式样式表 responsive.css
   断点：1920 / 1600 / 1440 / 1366 / 1280 / 1024 / 768 / 430 / 390 / 375
   PC 优先，向下适配
   ========================================================================== */

/* ============ 1. 超大屏 1920px+ ============ */
@media (min-width: 1920px) {
  :root {
    --container-width: 1400px;
  }

  .hero-title {
    font-size: 80px;
  }
}

/* ============ 2. 1600px ============ */
@media (max-width: 1600px) {
  :root {
    --container-padding: 64px;
  }
}

/* ============ 3. 1440px（设计基准） ============ */
/* 默认样式即为此断点，无需额外调整 */

/* ============ 4. 1366px ============ */
@media (max-width: 1366px) {
  :root {
    --container-width: 1200px;
    --container-padding: 48px;
    --text-display: 64px;
    --text-h1: 42px;
  }

  .section {
    padding: 96px 0;
  }
}

/* ============ 5. 1280px ============ */
@media (max-width: 1280px) {
  :root {
    --container-width: 1100px;
    --text-display: 56px;
    --text-h1: 38px;
    --text-h2: 32px;
  }

  .nav {
    gap: 32px;
  }

  .nav-link {
    font-size: 14px;
  }

  .advantage-grid,
  .product-grid,
  .news-grid {
    gap: 20px;
  }

  .advantage-card {
    padding: 36px 28px;
  }
}

/* ============ 6. 1024px 平板横屏 ============ */
@media (max-width: 1024px) {
  :root {
    --container-padding: 40px;
    --text-display: 48px;
    --text-h1: 34px;
    --text-h2: 28px;
    --text-h3: 22px;
    --section-padding: 80px 0;
  }

  .section {
    padding: 80px 0;
  }

  /* 导航折叠为汉堡菜单 */
  .menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    gap: 32px;
    background: #ffffff;
    padding: 80px 40px;
    transition: right 0.4s var(--ease);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
  }

  .nav.is-open {
    right: 0;
  }

  .nav-link {
    font-size: 20px;
    color: var(--color-text);
  }

  .nav-cta {
    padding: 14px 36px;
  }

  /* 关于我们 */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-text .section-title {
    text-align: center;
  }

  /* 优势 */
  .advantage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  /* 瀑布流 */
  .masonry {
    column-count: 2;
  }

  /* 品质检测 */
  .quality-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

  /* 联系 */
  .contact-top {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
  }

  /* 数字统计 */
  .counter-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
  }

  .scroll-down {
    right: 40px;
  }
}

/* ============ 7. 768px 平板竖屏 ============ */
@media (max-width: 768px) {
  :root {
    --container-padding: 32px;
    --text-display: 40px;
    --text-h1: 32px;
    --text-h2: 26px;
    --text-h3: 20px;
    --text-h4: 18px;
    --text-body-l: 16px;
    --section-padding: 64px 0;
    --header-height: 64px;
  }

  .section {
    padding: 64px 0;
  }

  /* Hero */
  .hero {
    min-height: 560px;
  }

  .hero-title {
    font-size: 40px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
  }

  .btn {
    width: 100%;
    padding: 14px 32px;
  }

  /* 滚动指示隐藏 */
  .scroll-down {
    display: none;
  }

  /* 区块标题 */
  .section-header {
    margin-bottom: 48px;
  }

  /* 关于我们 */
  .about-grid {
    margin-bottom: 64px;
  }

  /* 优势 - 单列 */
  .advantage-grid {
    grid-template-columns: 1fr;
  }

  /* 产品 - 单列 */
  .product-tabs {
    gap: 8px;
  }

  .product-tab {
    padding: 8px 20px;
    font-size: 14px;
  }

  .product-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  /* 瀑布流 - 单列 */
  .masonry {
    column-count: 1;
  }

  /* 新闻 - 单列 */
  .news-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  /* 品质检测 */
  .quality-cert {
    flex-wrap: wrap;
  }

  .cert-badge {
    flex: 1;
    min-width: 140px;
  }

  /* 数字统计 - 单列或两列 */
  .counter-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    padding: 48px 0;
  }

  .counter-number {
    font-size: 42px;
  }

  /* 表单 */
  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .contact-form {
    padding: 32px 24px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-bottom: 48px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  /* 返回顶部 */
  .back-top {
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
  }
}

/* ============ 8. 430px 大屏手机 ============ */
@media (max-width: 430px) {
  :root {
    --container-padding: 20px;
    --text-display: 32px;
    --text-h1: 26px;
    --text-h2: 22px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .counter-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .counter-number {
    font-size: 36px;
  }

  .product-info {
    padding: 20px 24px 28px;
  }

  .news-body {
    padding: 20px 24px 28px;
  }

  .cert-badge {
    flex-direction: column;
    text-align: center;
    gap: 8px;
    padding: 24px 20px;
  }

  .contact-form {
    padding: 24px 20px;
  }
}

/* ============ 9. 390px iPhone ============ */
@media (max-width: 390px) {
  :root {
    --container-padding: 16px;
  }

  .hero-title {
    font-size: 30px;
  }

  .logo-mark {
    font-size: 18px;
  }

  .logo-sub {
    font-size: 9px;
  }

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

  .nav {
    padding: 60px 24px;
  }

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

/* ============ 10. 375px 小屏手机 ============ */
@media (max-width: 375px) {
  :root {
    --container-padding: 16px;
    --text-display: 28px;
    --text-h1: 24px;
  }

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

  .btn {
    padding: 12px 28px;
    font-size: 14px;
  }

  .advantage-card {
    padding: 32px 24px;
  }

  .footer-bottom-inner p {
    font-size: 12px;
  }
}

/* ============ 11. 触摸设备优化 ============ */
@media (hover: none) and (pointer: coarse) {
  /* 移除 hover 依赖，改为 active 状态 */
  .advantage-card:hover {
    transform: none;
    box-shadow: none;
  }

  .product-card:hover .product-image img,
  .news-card:hover .news-image img,
  .masonry-item:hover img {
    transform: none;
  }

  .masonry-overlay {
    opacity: 1;
  }

  /* 增大触摸区域 */
  .nav-link,
  .product-tab,
  .footer-links a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .btn {
    min-height: 48px;
  }
}

/* ============ 12. 打印优化 ============ */
@media print {
  .header,
  .scroll-down,
  .back-top,
  .hero-slider,
  .hero-overlay,
  .logo-wall {
    display: none !important;
  }

  .hero {
    height: auto;
    min-height: auto;
  }

  .section {
    padding: 24px 0;
  }

  body {
    color: #000;
    background: #fff;
  }
}