/* ===== 基础重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: #333;
  line-height: 1.6;
  background: #fff;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { width: 90%; max-width: 1200px; margin: 0 auto; }

/* ===== 顶部导航 ===== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: #fff;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 80px;
}
.logo { display: flex; align-items: center; gap: 20px; }
.logo img { height: 56px; width: auto; }
.logo span {
  font-size: 24px; font-weight: bold;
  color: #C8102E; letter-spacing: 3px;
}
.nav ul { display: flex; list-style: none; gap: 36px; }
.nav ul a {
  font-size: 15px; color: #333; padding: 6px 0;
  border-bottom: 2px solid transparent; transition: .3s;
}
.nav ul a:hover, .nav ul a.active {
  color: #C8102E; border-bottom-color: #C8102E;
}

/* ===== 首屏 Banner ===== */
.banner {
  position: relative;
  min-height: 620px;
  background: #fff;
  overflow: hidden;
}
.banner-video {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  overflow: hidden;
  z-index: 1;
}
.banner-video video {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: left center;
}
.banner-video::after {
  content: '';
  position: absolute; inset: 0;
  background: rgba(0,0,0,.15);
}
.banner-block {
  position: absolute;
  left: 0; bottom: 0;
  width: 52%; min-height: 320px;
  background: #C8102E;
  padding: 60px 50px 50px 8%;
  color: #fff;
  z-index: 3;
  display: flex; flex-direction: column; justify-content: center;
}
.banner-block h1 {
  font-size: 42px; line-height: 1.2;
  font-weight: 900; text-transform: uppercase;
  letter-spacing: 1px;
}
.banner-block h1 span { color: #1f2733; }
.banner-side {
  position: absolute;
  right: 4%; bottom: 60px;
  width: 22%;
  background: rgba(255,255,255,.95);
  padding: 28px;
  z-index: 3;
  border-top: 4px solid #C8102E;
}
.banner-side h3 { font-size: 18px; margin-bottom: 12px; color: #1f2733; }
.banner-side p { font-size: 14px; color: #666; margin-bottom: 18px; }

/* ===== 通用区块 ===== */
.section { padding: 90px 0; }
.section-gray { background: #f7f9fc; }
.section-title { text-align: center; margin-bottom: 56px; }
.section-title h2 { font-size: 32px; color: #222; margin-bottom: 14px; }
.section-title .en {
  font-size: 14px; color: #C8102E; letter-spacing: 3px;
  text-transform: uppercase; display: block; margin-bottom: 10px;
}
.section-title p { color: #888; font-size: 15px; }

/* ===== 三张卡片 ===== */
.cards3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}
.card3 {
  position: relative; overflow: hidden;
  border-radius: 6px; background: #fff;
  box-shadow: 0 6px 24px rgba(0,0,0,.08);
  transition: .3s;
}
.card3:hover { transform: translateY(-6px); box-shadow: 0 14px 36px rgba(0,0,0,.14); }
.card3 .img { height: 220px; background: linear-gradient(135deg, #e8ebf0, #d5dae2); }
.card3 .label {
  background: #C8102E; color: #fff;
  padding: 18px 24px; font-size: 17px; font-weight: bold;
}

/* ===== 左文右列表 ===== */
.split { display: flex; gap: 60px; align-items: center; flex-wrap: wrap; }
.split .text { flex: 1; min-width: 280px; }
.split .text h2 { font-size: 28px; margin-bottom: 20px; color: #222; }
.split .text p { color: #666; margin-bottom: 16px; }
.split .list { flex: 1; min-width: 280px; }
.list-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 24px; margin-bottom: 12px;
  background: #fff; border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0,0,0,.05);
  transition: .3s;
}
.list-item:hover { transform: translateX(6px); border-left: 4px solid #C8102E; }
.list-item span:last-child { color: #C8102E; font-size: 20px; }

/* ===== 数据统计 ===== */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px; text-align: center;
}
.stats .num { font-size: 44px; font-weight: bold; color: #C8102E; }
.stats .label { color: #666; margin-top: 8px; }

/* ===== 产品展示 ===== */
.products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.product {
  background: #fff; border-radius: 6px; padding: 24px;
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
  text-align: center; transition: .3s;
}
.product:hover { transform: translateY(-6px); }
.product .img {
  height: 160px; background: #f0f2f5;
  border-radius: 4px; margin-bottom: 18px;
}
.product h3 { font-size: 16px; color: #222; }
.product { text-decoration: none; color: inherit; display: block; }

/* ===== 底部 CTA ===== */
.cta { background: #C8102E; color: #fff; padding: 80px 0; overflow: hidden; }
.cta-inner {
  display: flex; gap: 40px; align-items: center; flex-wrap: wrap;
}
.cta h2 { font-size: 32px; margin-bottom: 16px; }
.cta p { opacity: .9; margin-bottom: 24px; }
.cta .btn { background: #fff; color: #C8102E; }
.cta .btn:hover { background: #f0f2f5; }

/* ===== 按钮 ===== */
.btn {
  display: inline-block; padding: 13px 38px;
  background: #C8102E; color: #fff;
  border-radius: 4px; font-size: 15px;
  transition: .3s;
}
.btn:hover { background: #A00D24; transform: translateY(-2px); }
.btn-outline { background: transparent; border: 2px solid #fff; color: #fff; }
.btn-outline:hover { background: #fff; color: #C8102E; }

/* ===== 内页通栏大图 ===== */
.page-banner {
  position: relative;
  height: 480px;
  background-size: cover;
  background-position: center;
  display: flex; align-items: center; justify-content: center;
  text-align: center; color: #fff;
  overflow: hidden;
}
.page-banner::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(31,39,51,.4) 0%, rgba(31,39,51,.75) 100%);
  z-index: 1;
}
.page-banner .inner { position: relative; z-index: 2; }
.page-banner h1 { font-size: 42px; margin-bottom: 14px; font-weight: 900; }
.page-banner p { font-size: 16px; opacity: .9; }

/* ===== 页脚 ===== */
.footer {
  background: #1a212b;
  color: #b8c0cc;
  padding: 70px 0 28px;
  font-size: 14px;
  line-height: 1.8;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 60px;
  margin-bottom: 48px;
}
.footer-grid > div { min-width: 0; }
.footer h4 {
  color: #fff; font-size: 16px; font-weight: bold;
  margin-bottom: 20px; position: relative; padding-bottom: 12px;
}
.footer h4::after {
  content: ''; position: absolute;
  left: 0; bottom: 0;
  width: 28px; height: 2px;
  background: #C8102E;
}
.footer p { margin-bottom: 8px; }
.footer a {
  display: block; margin-bottom: 8px;
  color: #b8c0cc; transition: .3s;
}
.footer a:hover { color: #C8102E; }
.footer-logo img {
  height: 48px; margin-bottom: 18px;
  filter: brightness(0) invert(1);
}
.footer-bottom {
  border-top: 1px solid #2c3846;
  padding-top: 24px;
  text-align: center;
  color: #6b7685;
  font-size: 13px;
}

/* ===== 右下角悬浮咨询 ===== */
.float-advice {
  position: fixed;
  right: 24px; bottom: 24px;
  z-index: 999;
  display: flex; align-items: center;
  background: #C8102E; color: #fff;
  padding: 12px 20px;
  border-radius: 40px;
  box-shadow: 0 6px 24px rgba(200,16,46,.4);
  transition: .3s;
}
.float-advice:hover { transform: translateY(-3px); }
.float-advice .icon {
  width: 36px; height: 36px;
  background: #fff; color: #C8102E;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin-right: 12px; font-weight: bold;
}
.float-advice .txt { font-size: 14px; line-height: 1.3; }
.float-advice .txt strong { display: block; font-size: 15px; }

/* ===== 手机端适配 ===== */
@media (max-width: 900px) {
  .nav { height: 64px; }
  .logo { gap: 10px; }
  .logo img { height: 44px; }
  .logo span { font-size: 18px; letter-spacing: 1px; }
  .nav ul { display: none; }

  .banner { min-height: auto; }
  .banner-video { position: relative; width: 100%; height: 240px; }
  .banner-video video { height: 240px; }
  .banner-block {
    position: relative; width: 100%; min-height: auto;
    padding: 32px 24px;
  }
  .banner-block h1 { font-size: 26px; line-height: 1.3; }
  .banner-side {
    position: relative; right: auto; bottom: auto;
    width: 100%; margin: 0; padding: 24px;
  }
  .banner-side h3 { font-size: 16px; }
  .banner-side p { font-size: 13px; }

  .section { padding: 48px 0; }
  .section-title { margin-bottom: 32px; }
  .section-title h2 { font-size: 24px; }

  .cards3 { grid-template-columns: 1fr; gap: 18px; }
  .card3 .img { height: 160px; }

  .split { flex-direction: column; gap: 28px; }
  .split .text h2 { font-size: 22px; }
  .list-item { padding: 14px 18px; font-size: 14px; }

  .stats { grid-template-columns: 1fr 1fr; gap: 20px; }
  .stats .num { font-size: 32px; }

  .products { grid-template-columns: 1fr 1fr; gap: 16px; }
  .product { text-decoration: none; color: inherit; display: block; }
  .product { padding: 16px; }
  .product .img { height: 120px; }

  .cta { padding: 48px 0; }
  .cta-inner { flex-direction: column; text-align: center; gap: 20px; }
  .cta h2 { font-size: 22px; }

  .page-banner { height: 260px; }
  .page-banner h1 { font-size: 24px; }

  .footer { padding: 40px 0 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer h4 { font-size: 15px; }

  .float-advice { right: 16px; bottom: 16px; padding: 10px 16px; }
  .float-advice .icon { width: 30px; height: 30px; font-size: 14px; margin-right: 8px; }
  .float-advice .txt { font-size: 12px; }
  .float-advice .txt strong { font-size: 13px; }
}

/* ===== 新闻列表 ===== */
.news-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}
.news-item {
  background: #fff; border-radius: 6px; overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
  transition: .3s;
}
.news-item:hover { transform: translateY(-6px); box-shadow: 0 10px 28px rgba(0,0,0,.1); }
.news-item .thumb {
  height: 180px;
  background: linear-gradient(135deg, #e8ebf0, #d5dae2);
}
.news-item .body { padding: 22px; }
.news-item .body h3 { font-size: 17px; margin-bottom: 10px; color: #222; }
.news-item .body p { color: #777; font-size: 14px; margin-bottom: 12px; }
.news-item .date { color: #aaa; font-size: 13px; }
.news-item { text-decoration: none; color: inherit; display: block; }

/* 手机端 */
@media (max-width: 900px) {
  .news-list { grid-template-columns: 1fr; gap: 18px; }
}