/* 轮胎网 (luntai_theme) 
   风格：工业、稳重、力量感
   主色调：#222 (黑), #f90 (亮黄), #eee (浅灰)
*/

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", sans-serif; font-size: 14px; color: #333; background: #f4f4f4; }
a { color: #333; text-decoration: none; transition: 0.3s; }
a:hover { color: #f90; }
ul, li { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.row { display: flex; flex-wrap: wrap; margin-left: -15px; margin-right: -15px; }
.col-8 { width: 66.66%; padding: 0 15px; }
.col-4 { width: 33.33%; padding: 0 15px; }
.margin-top { margin-top: 30px; }

/* 头部 */
.header { background: #fff; }
.top-bar { background: #222; color: #999; font-size: 12px; padding: 8px 0; }
.top-bar .container { display: flex; justify-content: space-between; }
.top-bar a { color: #999; }

.header-main { display: flex; align-items: center; justify-content: space-between; padding: 25px 0; }
.logo img { height: 60px; }
.search-box { display: flex; border: 2px solid #222; border-radius: 4px; overflow: hidden; }
.search-input { border: none; padding: 10px 15px; width: 400px; outline: none; }
.search-btn { background: #222; color: #f90; border: none; padding: 0 30px; cursor: pointer; font-weight: bold; }
.hot-search { font-size: 12px; color: #999; margin-top: 5px; }
.hot-search a { margin-right: 10px; color: #666; }

.main-nav { background: #222; }
.nav-list { display: flex; }
.nav-list li a { display: block; padding: 15px 25px; color: #fff; font-size: 16px; font-weight: bold; }
.nav-list li.active a, .nav-list li a:hover { background: #f90; color: #222; }

/* 首页内容 */
.lt-banner { position: relative; height: 400px; overflow: hidden; border-radius: 4px; }
.lt-banner img { width: 100%; height: 400px; object-fit: cover; }
.banner-title { position: absolute; bottom: 0; left: 0; right: 0; background: rgba(0,0,0,0.7); color: #fff; padding: 15px 20px; font-size: 20px; }

.section-box { background: #fff; padding: 20px; border-radius: 4px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.sec-title { border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 15px; display: flex; justify-content: space-between; align-items: center; }
.sec-title h3 { font-size: 18px; border-left: 4px solid #f90; padding-left: 10px; }

.price-list li { border-bottom: 1px dashed #eee; padding: 10px 0; display: flex; justify-content: space-between; }
.price-list i { font-style: normal; font-size: 12px; }
.price-list i.up { color: #d00; }

.brand-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 15px; }
.brand-item { border: 1px solid #eee; padding: 15px; text-align: center; border-radius: 4px; transition: 0.3s; }
.brand-item:hover { border-color: #f90; transform: translateY(-3px); }

.section-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 25px; }
.section-title h2 { font-size: 24px; color: #222; }
.tab-nav a { margin-left: 20px; font-size: 14px; color: #666; }
.tab-nav a.active { color: #f90; font-weight: bold; border-bottom: 2px solid #f90; padding-bottom: 5px; }

.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pro-item { background: #fff; border-radius: 4px; overflow: hidden; transition: 0.3s; }
.pro-item:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
.pro-img img { width: 100%; height: 180px; object-fit: contain; background: #fff; }
.pro-info { padding: 15px; }
.pro-info h4 { font-size: 16px; margin-bottom: 10px; }
.specs { font-size: 12px; color: #999; margin-bottom: 15px; }
.pro-bottom { display: flex; justify-content: space-between; align-items: center; }
.price { color: #d00; font-weight: bold; }
.btn-detail { background: #222; color: #fff; font-size: 12px; padding: 5px 15px; border-radius: 20px; }

/* 底部 */
.footer { background: #222; color: #999; padding-top: 50px; margin-top: 60px; }
.footer-links { display: flex; justify-content: space-between; padding-bottom: 40px; border-bottom: 1px solid #333; }
.f-col h4 { color: #fff; margin-bottom: 20px; }
.f-col li { margin-bottom: 10px; }
.f-col a { color: #999; font-size: 13px; }
.f-qr { text-align: center; }
.f-qr img { width: 100px; height: 100px; background: #fff; padding: 5px; margin-bottom: 10px; }

.footer-bottom { background: #1a1a1a; padding: 30px 0; text-align: center; font-size: 12px; }
.friend-links { margin-bottom: 20px; border-bottom: 1px solid #222; padding-bottom: 15px; }

/* 列表页与内容页扩展 */
.breadcrumb { font-size: 13px; color: #999; padding: 10px 0; border-bottom: 1px solid #eee; }
.sidebar-nav li a { display: block; padding: 12px 15px; border-bottom: 1px solid #f5f5f5; color: #666; }
.sidebar-nav li.active a, .sidebar-nav li a:hover { color: #f90; border-left: 3px solid #f90; padding-left: 12px; background: #fcfcfc; }

.pro-list-item { display: flex; gap: 20px; padding: 20px 0; border-bottom: 1px solid #eee; }
.pro-l-img img { width: 200px; height: 150px; object-fit: contain; background: #fff; border: 1px solid #eee; }
.pro-l-info { flex: 1; }
.pro-l-info h4 { font-size: 18px; margin-bottom: 10px; }
.pro-specs { color: #f90; font-weight: bold; margin-bottom: 8px; }
.pro-desc { font-size: 13px; color: #777; margin-bottom: 15px; line-height: 1.8; }
.pro-l-bottom { display: flex; justify-content: space-between; align-items: center; }

.pagination { margin-top: 30px; text-align: center; }
.pagination li { display: inline-block; margin: 0 5px; }
.pagination a, .pagination span { display: block; padding: 5px 15px; border: 1px solid #ddd; background: #fff; }
.pagination .thisclass { background: #f90; border-color: #f90; color: #222; }

.article-header { text-align: center; padding-bottom: 25px; border-bottom: 1px solid #eee; margin-bottom: 30px; }
.article-header h1 { font-size: 28px; margin-bottom: 15px; }
.article-meta { font-size: 13px; color: #999; }
.article-meta span { margin: 0 15px; }

.product-params-box { display: flex; gap: 30px; background: #f9f9f9; padding: 25px; border-radius: 4px; margin-bottom: 30px; }
.params-img img { width: 300px; border: 1px solid #eee; }
.params-list { flex: 1; }
.params-list ul li { margin-bottom: 12px; border-bottom: 1px dashed #ddd; padding-bottom: 8px; }
.btn-quote { display: inline-block; background: #d00; color: #fff; padding: 10px 40px; border-radius: 4px; font-weight: bold; margin-top: 15px; }

.content-body { line-height: 2; font-size: 16px; margin-top: 30px; }
.content-body img { display: block; margin: 20px auto; max-width: 100%; }

.prenext { margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; font-size: 14px; }
.prenext div { margin-bottom: 10px; }

.sidebar-pro-list li { display: flex; gap: 10px; margin-bottom: 15px; padding-bottom: 15px; border-bottom: 1px solid #f5f5f5; }
.side-pro-img img { width: 80px; height: 60px; object-fit: contain; background: #fff; }
.side-pro-title { font-size: 13px; color: #666; line-height: 1.4; }