:root {
  --primary: #c31621;
  --text: #222;
  --muted: #666;
  --line: #e6e6e6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: url("https://www.jinersu.cn/skin/img/bg-img-05.jpg") top center fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
}

.top {
  background: #fff;
}

.top-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0 12px;
}

.logo img {
  height: 62px;
  width: auto;
}

.hotline img {
  height: 52px;
  width: auto;
}

.nav {
  background: var(--primary);
}

.nav-inner {
  position: relative;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: 0;
  color: #fff;
  font-size: 28px;
  padding: 8px 2px;
}

.menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
}

.menu li {
  position: relative;
}

.menu a {
  display: block;
  color: #fff;
  padding: 16px 24px;
  font-size: 16px;
}

.menu li.active a,
.menu a:hover {
  background: rgba(255, 255, 255, 0.14);
}

.hero {
  position: relative;
  width: 100%;
  max-width: 1920px;
  margin: 0 auto;
  overflow: hidden;
  background: #000;
}

.slides {
  position: relative;
  height: clamp(220px, 36vw, 500px);
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.slide.active {
  opacity: 1;
}

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

.dots {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.dot {
  width: 11px;
  height: 11px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  cursor: pointer;
}

.dot.active {
  background: #fff;
}

.section {
  background: #fff;
  margin-top: 18px;
  padding: 22px 26px 28px;
  border: 1px solid #efefef;
}

.section-title {
  border-bottom: 2px solid var(--primary);
  margin-bottom: 18px;
  padding-bottom: 8px;
}

.section-title h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
}

.with-more {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.with-more a {
  color: #999;
  font-size: 14px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  text-align: center;
}

.product-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border: 1px solid var(--line);
}

.product-card .name {
  display: inline-block;
  margin-top: 12px;
  font-size: 18px;
}

.split {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 24px;
}

.featured-news {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
}

.featured-news .thumb {
  width: 38%;
  min-width: 160px;
}

.featured-news img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.featured-news h3 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.3;
}

.featured-news p {
  margin: 0;
  color: var(--muted);
}

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

.news-list li {
  padding: 10px 0;
  border-top: 1px dashed #ddd;
}

.news-list a:hover,
.footer a:hover {
  color: var(--primary);
}

.video-card {
  margin-top: 2px;
}

.video-thumb {
  position: relative;
  display: block;
}

.video-thumb img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.play {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(195, 22, 33, 0.86);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 24px;
}

.video-card h3 {
  margin: 10px 0 0;
  font-size: 20px;
}

.footer {
  margin-top: 24px;
  background: #f8f8f8;
  border-top: 1px solid #e8e8e8;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr 1fr;
  gap: 20px;
  padding: 30px 0;
}

.footer-col h4 {
  margin: 8px 0 12px;
  font-size: 20px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin: 8px 0;
  color: #444;
}

.brand img {
  width: 190px;
}

.qrcode img {
  width: 120px;
  margin: 0 auto;
}

.qrcode {
  text-align: center;
}

.qrcode p {
  margin: 10px 0 0;
}

.footer-bottom {
  border-top: 1px solid #e1e1e1;
  padding: 14px 0 20px;
  color: #777;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.footer-bottom p {
  margin: 0;
  font-size: 14px;
}

.footer-bottom a {
  margin-left: 10px;
  color: #777;
}

.right-links {
  display: flex;
  gap: 16px;
}

@media (max-width: 1024px) {
  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split {
    grid-template-columns: 1fr;
  }

  .footer-main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .top-main {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .logo img {
    height: 54px;
  }

  .mobile-toggle {
    display: block;
  }

  .menu {
    display: none;
    flex-direction: column;
    width: 100%;
  }

  .menu.open {
    display: flex;
  }

  .menu a {
    padding: 12px 10px;
  }

  .section {
    padding: 18px 14px 20px;
  }

  .section-title h2 {
    font-size: 22px;
  }

  .featured-news {
    flex-direction: column;
  }

  .featured-news .thumb {
    width: 100%;
  }

  .featured-news h3 {
    font-size: 20px;
  }

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