/* ============================================================
   多多批车官网 · 响应式样式
   PC + 移动端，车商 B2B 批发风，主色「多多蓝」#163B70
   ============================================================ */
:root {
  --dd-blue: #163B70;
  --dd-blue-2: #2A5BA8;
  --dd-gold: #E8B339;
  --dd-green: #1AAE6F;
  --ink: #1B2430;
  --ink-2: #5B6470;
  --ink-3: #8A93A0;
  --line: #E4E8EF;
  --line-2: #F0F2F6;
  --bg: #F5F7FA;
  --card: #FFFFFF;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(22, 59, 112, .08);
  --maxw: 1200px;
  --price-red: #E23B3B;
}
* { 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(--ink); background: var(--bg); line-height: 1.6; font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.dot { display: inline-block; width: 3px; height: 3px; border-radius: 50%; background: var(--ink-3); margin: 0 8px; vertical-align: middle; }

/* ---------- 顶部导航 ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: #fff; border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand img.logo { height: 40px; width: 40px; object-fit: contain; }
.brand .wordmark { font-size: 22px; font-weight: 800; letter-spacing: 1px; color: var(--dd-blue); }
.brand .wordmark small { display: block; font-size: 11px; font-weight: 500; color: var(--ink-3); letter-spacing: 3px; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { font-size: 15px; color: var(--ink-2); font-weight: 500; padding: 6px 0; position: relative; }
.nav-links a:hover { color: var(--dd-blue); }
.nav-links a.active { color: var(--dd-blue); font-weight: 700; }
.nav-links a.active::after { content: ''; position: absolute; left: 0; right: 0; bottom: -4px; height: 3px; background: var(--dd-blue); border-radius: 3px; }
.nav-cta { background: var(--dd-blue); color: #fff; padding: 10px 20px; border-radius: 24px; font-weight: 600; font-size: 14px; }
.nav-cta:hover { background: var(--dd-blue-2); }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(135deg, var(--dd-blue) 0%, var(--dd-blue-2) 100%); color: #fff; padding: 56px 0 64px; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; right: -80px; top: -80px; width: 360px; height: 360px; border-radius: 50%; background: rgba(255,255,255,.06); }
.hero h1 { font-size: 34px; margin: 0 0 10px; font-weight: 800; }
.hero p.sub { font-size: 16px; opacity: .9; margin: 0 0 24px; }
.hero-stats { display: flex; gap: 40px; flex-wrap: wrap; margin-top: 28px; }
.hero-stats .stat b { font-size: 30px; display: block; }
.hero-stats .stat span { font-size: 13px; opacity: .85; }

/* ---------- 搜索框 ---------- */
.search-bar { background: #fff; border-radius: 16px; box-shadow: var(--shadow); padding: 18px; display: flex; gap: 12px; margin: -34px 0 0; position: relative; z-index: 5; flex-wrap: wrap; }
.search-bar input[type=text] { flex: 1; min-width: 180px; padding: 12px 16px; border: 1.5px solid var(--line); border-radius: 10px; font-size: 15px; outline: none; transition: border .2s; }
.search-bar input[type=text]:focus { border-color: var(--dd-blue); }
.search-bar .search-btn { background: var(--dd-blue); color: #fff; border: none; padding: 12px 28px; border-radius: 10px; font-size: 15px; font-weight: 600; cursor: pointer; }
.search-bar .search-btn:hover { background: var(--dd-blue-2); }

/* ---------- 分类浏览 chips ---------- */
.section { margin: 40px 0; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.section-head h2 { font-size: 22px; margin: 0; font-weight: 700; }
.section-head a { font-size: 14px; color: var(--dd-blue); font-weight: 600; }
.chip-row { display: flex; gap: 10px; flex-wrap: wrap; }
.chip { background: #fff; border: 1px solid var(--line); padding: 8px 18px; border-radius: 20px; font-size: 14px; color: var(--ink-2); cursor: pointer; transition: all .2s; }
.chip:hover { border-color: var(--dd-blue); color: var(--dd-blue); }
.chip.active { background: var(--dd-blue); color: #fff; border-color: var(--dd-blue); }

/* ---------- 平台优势 ---------- */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature { background: #fff; border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--shadow); text-align: center; }
.feature .ico { font-size: 34px; margin-bottom: 12px; }
.feature h3 { font-size: 17px; margin: 0 0 8px; }
.feature p { font-size: 13px; color: var(--ink-2); margin: 0; }

/* ---------- 筛选栏 ---------- */
.filter-bar { background: #fff; border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); display: flex; gap: 14px; flex-wrap: wrap; align-items: center; margin-bottom: 20px; }
.filter-bar label { font-size: 13px; color: var(--ink-2); display: flex; align-items: center; gap: 6px; }
.filter-bar select { padding: 9px 12px; border: 1.5px solid var(--line); border-radius: 8px; font-size: 14px; color: var(--ink); background: #fff; cursor: pointer; outline: none; }
.filter-bar select:focus { border-color: var(--dd-blue); }
.filter-bar .chk { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--ink-2); cursor: pointer; }
.filter-bar .chk input { width: 16px; height: 16px; accent-color: var(--dd-blue); }
.filter-bar .reset { margin-left: auto; background: none; border: 1px solid var(--line); padding: 9px 16px; border-radius: 8px; font-size: 14px; color: var(--ink-2); cursor: pointer; }
.filter-bar .reset:hover { border-color: var(--dd-blue); color: var(--dd-blue); }
.result-meta { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; color: var(--ink-2); font-size: 14px; }

/* ---------- 车源卡片网格 ---------- */
.car-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.car-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s; display: flex; flex-direction: column; }
.car-card:hover { transform: translateY(-4px); box-shadow: 0 10px 32px rgba(22,59,112,.14); }
.car-card .thumb { position: relative; display: block; aspect-ratio: 3/2; overflow: hidden; background: var(--line-2); }
.car-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.car-card .thumb:hover img { transform: scale(1.05); }
.badges { position: absolute; top: 10px; left: 10px; display: flex; gap: 6px; z-index: 2; }
.badge { font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 5px; color: #fff; }
.badge.top { background: var(--dd-gold); }
.badge.ws { background: var(--dd-green); }
.badge.real { background: #FA541C; }
.car-card.real { border: 1px solid rgba(250,84,28,.25); }
.price-usd { font-size: 11px; color: var(--ink-3); font-weight: 500; }
.img-count { position: absolute; bottom: 10px; right: 10px; font-size: 11px; color: #fff; background: rgba(0,0,0,.5); padding: 2px 8px; border-radius: 10px; z-index: 2; }
.car-card .body { padding: 14px 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.car-card .title { font-size: 15px; font-weight: 600; margin: 0; line-height: 1.45; color: var(--ink); }
.car-card .title a:hover { color: var(--dd-blue); }
.price { display: flex; align-items: baseline; gap: 8px; }
.price .pt-num { font-size: 22px; font-weight: 800; color: var(--price-red); }
.price .pt-tip { font-size: 12px; color: var(--dd-green); font-weight: 600; }
.meta { font-size: 13px; color: var(--ink-2); }
.tag-row { display: flex; gap: 6px; flex-wrap: wrap; }
.tag { font-size: 11px; color: var(--dd-blue); background: rgba(22,59,112,.08); padding: 2px 8px; border-radius: 4px; }
.foot { display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: 6px; font-size: 13px; }
.foot .shop { color: var(--ink-2); }
.foot .time { color: var(--ink-3); }

/* 卡片 mini（详情页相关） */
.car-card.mini { flex-direction: column; }
.car-card.mini .body { padding: 14px; gap: 6px; }

/* ---------- 空状态 ---------- */
.empty-state { text-align: center; padding: 60px 20px; color: var(--ink-2); background: #fff; border-radius: var(--radius); display: none; }
.empty-state .emoji { font-size: 40px; margin-bottom: 12px; }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding: 14px 0 0; font-size: 13px; color: var(--ink-3); background: transparent; }
.breadcrumb .crumb-list { display: flex; gap: 8px; list-style: none; padding: 0; margin: 0; flex-wrap: wrap; }
.breadcrumb .crumb-list li + li::before { content: '/'; margin-right: 8px; color: var(--line); }
.breadcrumb .crumb-list a:hover { color: var(--dd-blue); }
.breadcrumb .crumb-list [aria-current] { color: var(--ink); font-weight: 600; }

/* ---------- 平台流程 ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.flow-step { background: #fff; border-radius: var(--radius); padding: 24px 20px; box-shadow: var(--shadow); position: relative; }
.flow-step .num { width: 34px; height: 34px; border-radius: 50%; background: var(--dd-blue); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 16px; margin-bottom: 12px; }
.flow-step h3 { font-size: 16px; margin: 0 0 6px; }
.flow-step p { font-size: 13px; color: var(--ink-2); margin: 0; }

/* ---------- 详情页 ---------- */
.detail-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-top: 10px; }
.gallery { position: relative; border-radius: var(--radius); overflow: hidden; background: #fff; box-shadow: var(--shadow); aspect-ratio: 3/2; }
.gallery .gal-img { width: 100%; height: 100%; object-fit: cover; display: none; cursor: pointer; }
.gallery .gal-img.active { display: block; }
.d-title { font-size: 24px; font-weight: 700; margin: 0 0 14px; }
.d-price { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; }
.d-price .pt-num { font-size: 34px; font-weight: 800; color: var(--price-red); }
.d-price .pt-tip { font-size: 14px; color: var(--dd-green); font-weight: 600; }
.d-meta { font-size: 14px; color: var(--ink-2); margin-bottom: 18px; }
.spec-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border-radius: var(--radius); overflow: hidden; margin-bottom: 18px; }
.spec-item { background: #fff; padding: 12px 14px; display: flex; justify-content: space-between; }
.spec-item dt { color: var(--ink-3); font-size: 13px; }
.spec-item dd { margin: 0; font-size: 14px; font-weight: 600; }
.d-desc { color: var(--ink-2); font-size: 14px; margin-bottom: 16px; }
.d-shop { font-size: 14px; color: var(--ink); background: #fff; padding: 14px 16px; border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 12px; }
.d-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.d-demo { font-size: 12px; color: var(--ink-3); }
.d-actions { display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap; }
.d-actions .btn-primary { background: var(--dd-blue); color: #fff; padding: 14px 28px; border-radius: 10px; font-weight: 600; border: none; cursor: pointer; font-size: 15px; }
.d-actions .btn-ghost { background: #fff; border: 1.5px solid var(--line); color: var(--ink); padding: 14px 28px; border-radius: 10px; font-weight: 600; cursor: pointer; font-size: 15px; }
.related-section { margin-top: 48px; }
.no-data { color: var(--ink-3); font-size: 14px; }

/* ---------- FAQ ---------- */
.faq { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.faq h2 { font-size: 20px; margin: 0 0 16px; }
.faq details { padding: 12px 0; border-bottom: 1px solid var(--line-2); }
.faq details:last-child { border-bottom: none; }
.faq summary { font-size: 15px; font-weight: 600; cursor: pointer; }
.faq details p { color: var(--ink-2); font-size: 14px; margin: 10px 0 0; }

/* ---------- CTA 横幅 ---------- */
.cta-band { background: linear-gradient(135deg, var(--dd-blue), var(--dd-blue-2)); color: #fff; border-radius: var(--radius); padding: 40px; text-align: center; margin: 40px 0; }
.cta-band h2 { font-size: 26px; margin: 0 0 10px; }
.cta-band p { opacity: .9; margin: 0 0 22px; }
.cta-band .btn-cta { background: #fff; color: var(--dd-blue); padding: 14px 32px; border-radius: 26px; font-weight: 700; border: none; cursor: pointer; font-size: 15px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #142033; color: #B7C0CE; margin-top: 50px; padding: 40px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; }
.footer-grid h4 { color: #fff; font-size: 15px; margin: 0 0 14px; }
.footer-grid a { display: block; color: #B7C0CE; font-size: 14px; margin-bottom: 8px; }
.footer-grid a:hover { color: #fff; }
.footer-brand .fb-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand .fb-logo img { height: 36px; }
.footer-brand p { font-size: 13px; line-height: 1.7; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 30px; padding-top: 18px; font-size: 13px; text-align: center; color: #8A93A0; }

/* ---------- 客服悬浮 ---------- */
.kf-fab { position: fixed; right: 24px; bottom: 28px; z-index: 100; width: 60px; height: 60px; border-radius: 50%; background: var(--dd-green); color: #fff; display: flex; align-items: center; justify-content: center; box-shadow: 0 6px 20px rgba(26,174,111,.4); cursor: pointer; font-size: 26px; border: none; }
.kf-fab:hover { transform: scale(1.06); }
.kf-panel { position: fixed; right: 24px; bottom: 96px; z-index: 100; width: 300px; background: #fff; border-radius: 16px; box-shadow: 0 12px 40px rgba(0,0,0,.2); padding: 20px; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all .25s; }
.kf-panel.open { opacity: 1; visibility: visible; transform: translateY(0); }
.kf-panel h3 { margin: 0 0 4px; font-size: 16px; }
.kf-panel .kf-sub { font-size: 12px; color: var(--ink-3); margin-bottom: 14px; }
.kf-panel img.qr { width: 100%; border-radius: 10px; border: 1px solid var(--line); }
.kf-panel .kf-open { display: block; text-align: center; background: var(--dd-blue); color: #fff; padding: 12px; border-radius: 10px; margin-top: 14px; font-weight: 600; font-size: 14px; }
.kf-panel .kf-wechat { font-size: 13px; color: var(--ink-2); text-align: center; margin-top: 10px; }

/* ---------- 悬浮小程序码（扫码进小程序）---------- */
.mini-qr-fab { position: fixed; right: 24px; bottom: 100px; z-index: 99; width: 60px; height: 60px; border-radius: 50%; background: #FA541C; color: #fff; display: flex; flex-direction: column; align-items: center; justify-content: center; box-shadow: 0 6px 20px rgba(250,84,28,.4); cursor: pointer; border: none; font-size: 10px; line-height: 1.1; }
.mini-qr-fab .fab-ico { font-size: 20px; }
.mini-qr-panel { position: fixed; right: 96px; bottom: 90px; z-index: 99; width: 220px; background: #fff; border-radius: 14px; box-shadow: 0 12px 40px rgba(0,0,0,.2); padding: 14px; opacity: 0; visibility: hidden; transform: translateX(8px); transition: all .25s; }
.mini-qr-panel.open { opacity: 1; visibility: visible; transform: translateX(0); }
.mini-qr-panel .mq-title { font-size: 14px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.mini-qr-panel img { width: 100%; border-radius: 10px; border: 1px solid var(--line); }
.mini-qr-panel .mq-tip { font-size: 12px; color: var(--ink-3); margin-top: 8px; text-align: center; }

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  .car-grid { grid-template-columns: repeat(2, 1fr); }
  .features, .flow { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .detail-wrap { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
}
@media (max-width: 600px) {
  .nav-links { display: none; }
  .car-grid { grid-template-columns: 1fr; }
  .features, .flow, .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 36px 0 48px; }
  .hero-stats { gap: 24px; }
  .search-bar input[type=text] { min-width: 100%; }
}