* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; color: #333; background: #fff; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
.wp { max-width: 1200px; margin: 0 auto; padding: 0 15px; }

.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: rgba(0,20,40,.92); box-shadow: 0 2px 20px rgba(0,0,0,.15); }
.header .wp { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo img { height: 56px; width: auto; }
.logo span { font-size: 18px; font-weight: 700; color: #fff; letter-spacing: 1px; }
.nav { display: flex; gap: 0; }
.nav > li > a { display: block; padding: 0 16px; line-height: 70px; color: rgba(255,255,255,.85); font-size: 15px; transition: color .3s; }
.nav > li.on > a, .nav > li > a:hover { color: #00a8ff; }
.menuBtn { display: none; width: 30px; height: 24px; cursor: pointer; flex-direction: column; justify-content: space-between; }
.menuBtn b { display: block; height: 3px; background: #fff; border-radius: 3px; transition: all .3s; }
.menuBtn.active b:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
.menuBtn.active b:nth-child(2) { opacity: 0; }
.menuBtn.active b:nth-child(3) { transform: rotate(-45deg) translate(7px, -8px); }

.page-banner { position: relative; height: 320px; display: flex; align-items: center; justify-content: center; background: #0a1a2e; margin-top: 70px; overflow: hidden; }
.page-banner .bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.page-banner .bg::after { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(0,20,40,.85) 0%, rgba(0,50,100,.45) 100%); }
.page-banner .con { position: relative; z-index: 2; text-align: center; color: #fff; padding: 0 20px; }
.page-banner .con h2 { font-size: 38px; font-weight: 700; letter-spacing: 2px; }
.page-banner .con h2 span { color: #00a8ff; }
.page-banner .con p { font-size: 15px; opacity: .85; margin-top: 8px; letter-spacing: 4px; }

.breadcrumb { padding: 14px 0; font-size: 13px; color: #888; }
.breadcrumb a { color: #00a8ff; }
.breadcrumb .sep { margin: 0 6px; color: #ccc; }

.section-title { text-align: center; padding: 50px 0 30px; }
.section-title h3 { font-size: 30px; color: #1a2a3a; font-weight: 700; letter-spacing: 2px; }
.section-title h3 small { display: block; font-size: 13px; color: #00a8ff; font-weight: 400; letter-spacing: 4px; text-transform: uppercase; margin-top: 6px; }
.section-title p { color: #888; margin-top: 8px; font-size: 14px; }

.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding-bottom: 50px; }
.product-item { background: #fff; border-radius: 8px; overflow: hidden; transition: all .3s; box-shadow: 0 2px 12px rgba(0,0,0,.06); display: block; }
.product-item:hover { transform: translateY(-5px); box-shadow: 0 8px 30px rgba(0,0,0,.1); }
.product-item .pic { height: 210px; background: #f0f4f8; }
.product-item .pic img { width: 100%; height: 100%; object-fit: cover; }
.product-item h4 { padding: 15px 14px 18px; font-size: 15px; text-align: center; color: #333; font-weight: 600; }

.site-footer { background: #040d18; padding: 24px 0; text-align: center; color: rgba(255,255,255,.4); font-size: 13px; }
.site-footer p { margin-bottom: 4px; line-height: 1.6; }
.site-footer a { color: rgba(255,255,255,.4); }
.site-footer a:hover { color: #00a8ff; }

.error-page { min-height: 60vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 120px 15px 80px; }
.error-page h1 { font-size: 72px; color: #00a8ff; }
.error-page p { color: #666; margin: 12px 0 24px; }
.btn { display: inline-block; padding: 12px 36px; background: #00a8ff; color: #fff; border-radius: 24px; font-size: 15px; }

@media (max-width: 1024px) { .product-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) {
  .menuBtn { display: flex; }
  .nav { display: none; position: absolute; top: 70px; left: 0; width: 100%; background: rgba(0,20,40,.98); flex-direction: column; }
  .nav.open { display: flex; }
  .nav > li > a { line-height: 44px; border-bottom: 1px solid rgba(255,255,255,.05); padding: 0 15px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .page-banner { height: 240px; }
  .page-banner .con h2 { font-size: 26px; }
}
@media (max-width: 480px) { .product-grid { grid-template-columns: 1fr; } }