:root {
  --primary: #1a63c4;
  --primary-dark: #0f4c9e;
  --accent: #2f7fe0;
  --dark: #0e2a47;
  --text: #333;
  --muted: #7a8aa0;
  --bg: #f5f9ff;
  --line: #e6ecf5;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* 顶栏 */
.topbar {
  background: var(--dark);
  color: #c9d6e8;
  font-size: 13px;
  padding: 8px 0;
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; }
.topbar a { color: #c9d6e8; }
.topbar .contact span { margin-right: 18px; }

/* 头部导航 */
.site-header { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 50; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; font-size: 22px; font-weight: 700; color: var(--dark); }
.brand .logo {
  width: 42px; height: 42px; border-radius: 6px;
  background: var(--primary);
  color: #fff; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 800;
}
.brand .logo-img { height: 44px; width: auto; display: block; mix-blend-mode: multiply; }
.brand small { display: block; font-size: 12px; color: var(--muted); font-weight: 400; }
.nav { display: flex; gap: 30px; }
.nav a { font-size: 16px; color: var(--text); padding: 6px 0; position: relative; }
.nav a:hover, .nav a.active { color: var(--primary); }
.nav a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 3px;
  background: var(--primary); border-radius: 3px;
}

/* 首页 Hero */
.hero {
  background: linear-gradient(135deg, #0e2a47 0%, #14427e 60%, #1a63c4 100%);
  color: #fff; padding: 90px 0; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -100px; top: -100px; width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(255,255,255,.18), transparent 70%); border-radius: 50%;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { font-size: 42px; margin: 0 0 16px; line-height: 1.25; }
.hero p { font-size: 18px; color: #dbe7f7; max-width: 640px; margin: 0 0 28px; }
.hero .tag { display: inline-block; background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.3); padding: 6px 16px; border-radius: 30px; font-size: 14px; margin-bottom: 20px; }
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 30px; font-size: 16px; font-weight: 600;
  cursor: pointer; border: none; transition: .2s;
}
.btn-primary { background: #fff; color: var(--primary-dark); }
.btn-primary:hover { background: #eaf3ff; }
.btn-outline { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.6); margin-left: 12px; }
.btn-outline:hover { background: rgba(255,255,255,.12); }
.btn-blue { background: var(--primary); color: #fff; }
.btn-blue:hover { background: var(--primary-dark); }

/* 通用 section */
.section { padding: 64px 0; }
.section.alt { background: var(--bg); }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 30px; color: var(--dark); margin: 0 0 10px; }
.section-title p { color: var(--muted); margin: 0; }

/* 卡片网格 */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(20,66,126,.12); }
.card .thumb { aspect-ratio: 4/3; overflow: hidden; background: #eef3fa; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.card:hover .thumb img { transform: scale(1.06); }
.card .body { padding: 18px; }
.card h3 { margin: 0 0 8px; font-size: 18px; color: var(--dark); }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

/* 优势 */
.adv-item { text-align: center; padding: 30px 20px; background: #fff; border-radius: var(--radius); border: 1px solid var(--line); }
.adv-item .icon {
  width: 60px; height: 60px; margin: 0 auto 16px; border-radius: 8px;
  background: var(--primary);
  color: #fff; font-size: 26px; display: flex; align-items: center; justify-content: center;
}
.adv-item h3 { margin: 0 0 8px; color: var(--dark); }
.adv-item p { margin: 0; color: var(--muted); font-size: 14px; }

/* 列表页 */
.page-hero { background: linear-gradient(135deg, #0e2a47, #1a63c4); color: #fff; padding: 56px 0; }
.page-hero h1 { margin: 0; font-size: 32px; }
.page-hero p { margin: 8px 0 0; color: #dbe7f7; }

.list-item { display: flex; gap: 20px; padding: 20px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 16px; transition: .2s; }
.list-item:hover { box-shadow: 0 8px 22px rgba(20,66,126,.1); }
.list-item .thumb { width: 200px; height: 140px; flex: none; border-radius: 8px; overflow: hidden; background: #eef3fa; }
.list-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
.list-item .info { flex: 1; }
.list-item .info h3 { margin: 0 0 8px; font-size: 20px; color: var(--dark); }
.list-item .info .meta { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.list-item .info p { margin: 0; color: var(--muted); }

/* 详情页 */
.detail-head { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.detail-gallery .main-img { border-radius: var(--radius); overflow: hidden; background: #eef3fa; }
.detail-gallery .main-img img { width: 100%; height: 380px; object-fit: cover; }
.detail-gallery .thumbs { display: flex; gap: 10px; margin-top: 10px; }
.detail-gallery .thumbs img { width: 80px; height: 60px; object-fit: cover; border-radius: 8px; cursor: pointer; border: 2px solid transparent; }
.detail-gallery .thumbs img.active { border-color: var(--primary); }
.detail-info h1 { margin: 0 0 12px; color: var(--dark); font-size: 28px; }
.detail-info .meta { color: var(--muted); margin-bottom: 16px; }
.detail-info .summary { font-size: 17px; color: var(--dark); }
.article-body { max-width: 820px; margin: 0 auto; }
.article-body p { margin: 0 0 16px; font-size: 16px; }

/* 页脚 */
.site-footer { background: var(--dark); color: #b9c8dd; margin-top: 60px; }
.site-footer .container { padding: 48px 20px 24px; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; }
.site-footer h4 { color: #fff; margin: 0 0 16px; font-size: 16px; }
.site-footer p, .site-footer a { color: #b9c8dd; font-size: 14px; line-height: 2; }
.site-footer .copyright { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.1); padding-top: 20px; text-align: center; font-size: 13px; color: #7e90a8; }

/* 面包屑 / 标签 */
.badge { display: inline-block; padding: 2px 10px; border-radius: 20px; font-size: 12px; background: #eaf3ff; color: var(--primary); }
.badge.notice { background: #fff4e5; color: #c77800; }
.empty { text-align: center; color: var(--muted); padding: 60px 0; }

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .detail-head { grid-template-columns: 1fr; }
  .site-footer .container { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
}
@media (max-width: 560px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .list-item { flex-direction: column; }
  .list-item .thumb { width: 100%; }
}

/* 首页图片轮播 */
.carousel { position: relative; height: 520px; overflow: hidden; background: #0e2a47; }
.carousel .slides { position: absolute; inset: 0; }
.carousel .slide {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0; visibility: hidden; transition: opacity .7s ease, visibility .7s;
}
.carousel .slide.active { opacity: 1; visibility: visible; }
.carousel .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(8,20,40,.85) 0%, rgba(8,20,40,.55) 55%, rgba(8,20,40,.25) 100%);
}
.carousel .container { position: relative; z-index: 1; height: 100%; display: flex; align-items: center; }
.carousel .slide-content { max-width: 640px; color: #fff; }
.carousel .slide-content .tag {
  display: inline-block; background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.3); padding: 6px 16px;
  border-radius: 30px; font-size: 14px; margin-bottom: 20px;
}
.carousel .slide-content h1 { font-size: 44px; line-height: 1.2; margin: 0 0 16px; }
.carousel .slide-content p { font-size: 18px; color: #dbe7f7; margin: 0 0 28px; }
.car-btn {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 3;
  width: 46px; height: 46px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,.18); color: #fff; font-size: 22px; line-height: 1;
  display: flex; align-items: center; justify-content: center; transition: background .2s;
}
.car-btn:hover { background: rgba(255,255,255,.35); }
.car-btn.prev { left: 20px; }
.car-btn.next { right: 20px; }
.car-dots { position: absolute; bottom: 20px; left: 0; right: 0; z-index: 3; display: flex; justify-content: center; gap: 10px; }
.car-dots .dot {
  width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.4);
  cursor: pointer; transition: background .2s, transform .2s;
}
.car-dots .dot.active { background: #fff; transform: scale(1.2); }

/* 备案号 */
.icp-link { color: #7e90a8; font-size: 13px; }
.icp-link:hover { color: #b9c8dd; }

/* 分页 */
.pager { display: flex; justify-content: center; gap: 8px; margin-top: 24px; flex-wrap: wrap; }
.pager a, .pager span {
  min-width: 38px; height: 38px; padding: 0 12px; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); color: var(--text); font-size: 14px; background: #fff;
}
.pager a:hover { border-color: var(--primary); color: var(--primary); }
.pager span.current { background: var(--primary); color: #fff; border-color: var(--primary); }
.pager span.disabled { color: #c2cbd9; }

/* 产品分类筛选 */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.filter-bar a {
  padding: 8px 18px; border-radius: 30px; border: 1px solid var(--line);
  font-size: 14px; color: var(--text); background: #fff;
}
.filter-bar a:hover { border-color: var(--primary); color: var(--primary); }
.filter-bar a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 留言表单 */
.message-form { max-width: 640px; margin: 40px auto 0; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.message-form .field { margin-bottom: 16px; }
.message-form label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--dark); }
.message-form input, .message-form textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: inherit;
}
.message-form textarea { min-height: 120px; resize: vertical; }
.message-form input:focus, .message-form textarea:focus { outline: none; border-color: var(--primary); }
.message-form .success-msg { background: #eafaf1; color: #1e8449; padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.message-form .error-msg { background: #fdecea; color: #c0392b; padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }

@media (max-width: 900px) {
  .carousel { height: 420px; }
  .carousel .slide-content h1 { font-size: 32px; }
}
@media (max-width: 560px) {
  .carousel { height: 380px; }
  .carousel .slide-content h1 { font-size: 26px; }
  .carousel .slide-content p { font-size: 15px; }
  .car-btn { display: none; }
}