/* 占位内容临时隐藏（拿到真实信息后去掉元素上的 hidden 即可） */
[hidden] { display: none !important; }

/* ============================================
   乘龙专用车官网 v2 - 公共样式
   参考中集瑞江风格：传统工业风
   ============================================ */

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif; font-size: 14px; color: #333; line-height: 1.6; background: #fff; }
a { color: inherit; text-decoration: none; transition: color .25s; }
a:hover { color: #ff6b35; }
ul, ol { list-style: none; }
img { max-width: 100%; vertical-align: middle; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.clearfix::after { content: ""; display: block; clear: both; }

/* ============== 主导航 ============== */
.main-nav { background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,.06); position: sticky; top: 0; z-index: 100; transition: all .3s; }
.main-nav .container { display: flex; align-items: center; justify-content: space-between; height: 90px; }
.logo img { height: 56px; }
.logo h1 { font-size: 0; line-height: 0; }
.nav-menu { display: flex; align-items: center; gap: 0; }
.nav-menu > li { position: relative; }
.nav-menu > li > a { display: block; padding: 0 22px; line-height: 90px; font-size: 15px; font-weight: 500; color: #222; position: relative; }
.nav-menu > li > a::after { content: ""; position: absolute; bottom: 22px; left: 22px; right: 22px; height: 3px; background: #ff6b35; transform: scaleX(0); transition: transform .3s; }
.nav-menu > li:hover > a, .nav-menu > li.active > a { color: #003366; }
.nav-menu > li:hover > a::after, .nav-menu > li.active > a::after { transform: scaleX(1); }

/* Mega Menu 下拉 */
.mega-menu { position: absolute; top: 100%; left: 50%; transform: translateX(-50%); background: #fff; width: 1000px; max-width: 95vw; box-shadow: 0 8px 24px rgba(0,0,0,.12); padding: 30px; opacity: 0; visibility: hidden; transition: all .25s; pointer-events: none; }
.nav-menu > li:hover .mega-menu { opacity: 1; visibility: visible; pointer-events: auto; transform: translateX(-50%) translateY(0); }
.mega-menu { display: grid; grid-template-columns: repeat(4, 1fr) 180px; gap: 22px; }
.mega-col h4 { font-size: 14px; font-weight: 600; color: #003366; padding-bottom: 10px; margin-bottom: 12px; border-bottom: 2px solid #ff6b35; }
.mega-col ul li { margin-bottom: 8px; font-size: 13px; color: #555; }
.mega-col ul li:hover { color: #ff6b35; padding-left: 4px; }
.mega-thumbnail { background: #f5f5f5; padding: 12px; border-radius: 4px; }
.mega-thumbnail img { width: 100%; border-radius: 4px; }

/* 普通下拉 */
.sub-menu { position: absolute; top: 100%; left: 0; background: #fff; min-width: 200px; box-shadow: 0 8px 24px rgba(0,0,0,.12); padding: 10px 0; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all .25s; }
.nav-menu > li:hover .sub-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.sub-menu li a { display: block; padding: 10px 22px; font-size: 14px; color: #555; }
.sub-menu li a:hover { background: #f5f7fa; color: #ff6b35; }

/* 导航咨询电话 */
.nav-phone { background: #ff6b35; color: #fff; padding: 0 24px; line-height: 90px; font-size: 14px; font-weight: 500; }
.nav-phone i { margin-right: 6px; }
.nav-phone:hover { background: #e85a25; color: #fff; }

/* ============== 页脚 ============== */
.footer { background: #1a2e4a; color: rgba(255,255,255,.75); padding-top: 60px; }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; padding-bottom: 50px; }
.footer-col h3 { color: #fff; font-size: 16px; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid #ff6b35; }
.footer-col ul li { margin-bottom: 10px; font-size: 13px; }
.footer-col ul li a:hover { color: #ff6b35; }
.footer-contact-item { margin-bottom: 12px; font-size: 13px; }
.footer-contact-item .label { color: rgba(255,255,255,.5); margin-right: 6px; }
.footer-qr { display: flex; gap: 16px; margin-top: 20px; }
.footer-qr img { width: 80px; height: 80px; border: 1px solid rgba(255,255,255,.2); }
.copyright { background: #0d1a2d; padding: 18px 0; font-size: 12px; color: rgba(255,255,255,.5); }
.copyright .container { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 4px 20px; }
.copyright a { color: rgba(255,255,255,.5); transition: color .3s; }
.copyright a:hover { color: #ff6b35; }
.copyright a[hidden] { display: none; }

/* ============== 通用页面标题 banner ============== */
.page-banner { height: 280px; background: linear-gradient(rgba(0,51,102,.85), rgba(0,51,102,.85)), url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 280"><rect fill="%23003366" width="1200" height="280"/><g fill="%23ffffff" opacity="0.05"><polygon points="0,200 280,0 0,0"/><polygon points="280,200 560,0 280,0"/><polygon points="560,200 840,0 560,0"/><polygon points="840,200 1120,0 840,0"/><polygon points="1120,200 1400,0 1120,0"/></g></svg>'); background-size: cover; background-position: center; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #fff; text-align: center; }
.page-banner h1 { font-size: 36px; font-weight: 600; margin-bottom: 12px; letter-spacing: 4px; }
.page-banner .en { font-size: 14px; opacity: .7; letter-spacing: 2px; margin-bottom: 24px; }
.breadcrumb-bar { background: #f5f7fa; padding: 14px 0; font-size: 13px; color: #666; }
.breadcrumb-bar a { color: #003366; }
.breadcrumb-bar a:hover { color: #ff6b35; }
.breadcrumb-bar .sep { margin: 0 10px; color: #ccc; }

/* ============== 通用按钮 ============== */
.btn-primary { display: inline-block; background: #ff6b35; color: #fff; padding: 12px 32px; font-size: 14px; border-radius: 2px; transition: all .25s; }
.btn-primary:hover { background: #e85a25; color: #fff; transform: translateY(-2px); }
.btn-outline { display: inline-block; border: 1px solid #fff; color: #fff; padding: 12px 32px; font-size: 14px; border-radius: 2px; transition: all .25s; }
.btn-outline:hover { background: #fff; color: #003366; }

/* ============== 通用区块标题 ============== */
.section { padding: 70px 0; }
.section.gray { background: #f5f7fa; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title .en { color: #999; font-size: 14px; letter-spacing: 4px; margin-bottom: 8px; text-transform: uppercase; }
.section-title h2 { font-size: 32px; color: #003366; font-weight: 600; margin-bottom: 14px; }
.section-title .line { width: 50px; height: 3px; background: #ff6b35; margin: 0 auto; }

/* ============== 响应式 ============== */
@media (max-width: 992px) {
  .nav-menu, .nav-phone { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .mega-menu { width: 95vw; grid-template-columns: 1fr 1fr; }
  .mega-thumbnail { display: none; }
  .section { padding: 50px 0; }
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; }
  .page-banner h1 { font-size: 26px; }
  .section-title h2 { font-size: 24px; }
}