/* Dongfeng Commercial Vehicle — Global Site (light theme) */
:root{
  --blue:#00539f; --blue-d:#003a6b; --blue-dd:#00294d;
  --red:#c8102e; --ink:#1c2530; --sub:#5a6a7a;
  --line:#e2e8ef; --bg:#f5f7fa; --card:#ffffff;
  --radius:10px; --shadow:0 2px 14px rgba(16,42,67,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;color:var(--ink);background:var(--card);line-height:1.65;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--red)}
.container{max-width:1200px;margin:0 auto;padding:0 22px}

/* ---------- Top bar ---------- */
.topbar{background:var(--blue-dd);color:#cfe0f2;font-size:13.5px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;min-height:38px;gap:14px;flex-wrap:wrap}
.topbar a{color:#fff;opacity:.85}
.topbar a:hover{opacity:1}
.topbar .tb-left span{margin-right:18px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:900;background:#fff;box-shadow:0 1px 8px rgba(16,42,67,.10)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:11px}
.brand svg{width:52px;height:34px}
.brand .b-name{font-size:21px;font-weight:800;color:var(--blue-d);letter-spacing:.5px;line-height:1.1}
.brand .b-sub{font-size:10.5px;color:var(--sub);letter-spacing:1.6px;text-transform:uppercase}
nav.main-nav ul{display:flex;gap:4px;list-style:none}
nav.main-nav a{display:block;padding:9px 14px;font-weight:600;font-size:15px;color:var(--ink);border-radius:6px}
nav.main-nav a:hover{background:#eef4fa;color:var(--blue)}
nav.main-nav a.active{color:var(--blue)}
.btn{display:inline-block;padding:12px 26px;border-radius:6px;font-weight:700;font-size:15px;transition:.2s;border:2px solid transparent;cursor:pointer}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:#a30d25;color:#fff}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--blue-d);color:#fff}
.btn-outline{border-color:#fff;color:#fff}
.btn-outline:hover{background:#fff;color:var(--blue-d)}
.btn-sm{padding:8px 16px;font-size:13.5px}
.nav-toggle{display:none;background:none;border:0;font-size:26px;color:var(--blue-d);cursor:pointer}

/* ---------- Hero ---------- */
.hero{position:relative;background:linear-gradient(115deg,var(--blue-dd) 0%,var(--blue-d) 45%,var(--blue) 100%);color:#fff;overflow:hidden}
.hero .container{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:30px;align-items:center;padding-top:64px;padding-bottom:64px;min-height:520px}
.hero h1{font-size:44px;line-height:1.15;font-weight:800;margin-bottom:18px}
.hero h1 em{font-style:normal;color:#ffd34d}
.hero p.lead{font-size:18px;opacity:.92;max-width:520px;margin-bottom:28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-img{position:relative}
.hero-img img{width:100%;border-radius:12px;box-shadow:0 18px 44px rgba(0,0,0,.35)}
.hero-badge{position:absolute;left:-14px;bottom:26px;background:#fff;color:var(--ink);border-radius:10px;padding:12px 18px;box-shadow:var(--shadow);font-size:13.5px;font-weight:700;color:var(--blue-d)}
.hero-badge small{display:block;font-weight:500;color:var(--sub)}

/* ---------- Section headings ---------- */
section{padding:64px 0}
.section-alt{background:var(--bg)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 44px}
.sec-head h2{font-size:32px;color:var(--ink);margin-bottom:12px}
.sec-head .kicker{display:inline-block;color:var(--red);font-weight:800;font-size:13px;letter-spacing:2px;text-transform:uppercase;margin-bottom:8px}
.sec-head p{color:var(--sub);font-size:16.5px}

/* ---------- Hero slider ---------- */
.hero-slider{position:relative;height:620px;overflow:hidden;background:var(--blue-dd)}
.hero-slider .slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1s ease;display:flex;align-items:center;visibility:hidden}
.hero-slider .slide.active{opacity:1;visibility:visible}
.slide-shade{position:absolute;inset:0;background:linear-gradient(100deg,rgba(0,22,44,.88) 0%,rgba(0,40,74,.62) 45%,rgba(0,40,74,.18) 100%)}
.slide-content{position:relative;z-index:2;width:100%}
.slide-content h1{font-size:44px;line-height:1.15;font-weight:800;color:#fff;margin-bottom:18px;max-width:640px}
.slide-content h1 em{font-style:normal;color:#ffd34d}
.slide-content p.lead{font-size:18px;color:rgba(255,255,255,.92);max-width:540px;margin-bottom:28px}
.slider-dots{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:5}
.slider-dots button{width:12px;height:12px;border-radius:50%;border:2px solid #fff;background:transparent;cursor:pointer;padding:0;transition:.2s}
.slider-dots button.active{background:#fff}

/* ---------- Video ---------- */
.video-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.video-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.video-card video{width:100%;display:block;aspect-ratio:16/9;background:#000;object-fit:cover}
/* 视频位暂时用剧照图占位：与 video 同尺寸，恢复视频时删掉本行即可 */
.video-card .video-still img{width:100%;display:block;aspect-ratio:16/9;background:#000;object-fit:cover}
.video-card h3{font-size:17.5px;color:var(--blue-d);margin:16px 20px 6px}
.video-card p{font-size:14px;color:var(--sub);margin:0 20px 20px}
.brand-logo{height:46px;width:auto;display:block}

/* ---------- Category cards ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.cat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.25s;display:block;color:var(--ink)}
.cat-card:hover{transform:translateY(-5px);box-shadow:0 12px 30px rgba(16,42,67,.16);color:var(--ink)}
.cat-card .cc-body{padding:18px 20px 20px}
.cat-card h3{font-size:18px;margin-bottom:6px;color:var(--blue-d)}
.cat-card p{font-size:14px;color:var(--sub)}
.cat-card .cc-link{display:inline-block;margin-top:10px;font-weight:700;font-size:13.5px;color:var(--red)}
.cat-img{height:190px;overflow:hidden;background:#fff;display:flex;align-items:center;justify-content:center}
.cat-img img{width:100%;height:100%;object-fit:contain;padding:10px}

/* ---------- Product cards ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.25s;display:flex;flex-direction:column;color:var(--ink)}
.prod-card:hover{transform:translateY(-5px);box-shadow:0 12px 30px rgba(16,42,67,.16)}
.prod-img{height:225px;background:#fff;display:flex;align-items:center;justify-content:center;border-bottom:1px solid var(--line);overflow:hidden}
.prod-img img{width:100%;height:100%;object-fit:contain;padding:12px}
.prod-body{padding:20px 22px 22px;flex:1;display:flex;flex-direction:column}
.prod-tag{font-size:11.5px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase;color:var(--red)}
.prod-body h3{font-size:20px;margin:5px 0 3px;color:var(--blue-d)}
.prod-body .p-sub{font-size:13.5px;color:var(--sub);margin-bottom:12px}
.p-specs{font-size:13.5px;color:var(--ink);border-top:1px dashed var(--line);padding-top:12px;margin-bottom:16px;flex:1}
.p-specs div{display:flex;justify-content:space-between;gap:10px;padding:2.5px 0}
.p-specs span:first-child{color:var(--sub)}
.p-specs span:last-child{font-weight:600;text-align:right}
.prod-foot{display:flex;gap:10px;align-items:center}
.prod-foot .btn{flex:1;text-align:center}

/* ---------- Feature / why us ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;box-shadow:var(--shadow)}
.feat .f-ico{width:54px;height:54px;border-radius:12px;background:#e8f1fa;color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:16px}
.feat h3{font-size:18px;margin-bottom:8px;color:var(--blue-d)}
.feat p{font-size:14.5px;color:var(--sub)}

/* ---------- Solutions ---------- */
.sol-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.sol{position:relative;border-radius:var(--radius);overflow:hidden;min-height:340px;display:flex;align-items:flex-end;box-shadow:var(--shadow)}
.sol .sol-bg{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,42,77,.15),rgba(0,42,77,.82));z-index:1}
.sol img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.sol .sol-txt{position:relative;z-index:2;color:#fff;padding:24px}
.sol .sol-txt h3{font-size:19px;margin-bottom:6px}
.sol .sol-txt p{font-size:13.5px;opacity:.9;margin-bottom:10px}
.sol .sol-txt a{color:#ffd34d;font-weight:700;font-size:13.5px}

/* ---------- Stats ---------- */
.stats{background:linear-gradient(115deg,var(--blue-dd),var(--blue-d));color:#fff}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;padding-top:56px;padding-bottom:56px}
.stat{text-align:center}
.stat .num{font-size:42px;font-weight:800;color:#ffd34d;line-height:1.1}
.stat .num small{font-size:22px}
.stat .lbl{font-size:14px;opacity:.85;margin-top:6px}

/* ---------- Split / about teaser ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.split h2{font-size:30px;margin-bottom:16px}
.split p{color:var(--sub);margin-bottom:14px}
.split ul{list-style:none;margin:0 0 22px}
.split ul li{padding:6px 0 6px 30px;position:relative;font-size:15px}
.split ul li::before{content:"✓";position:absolute;left:0;top:6px;color:var(--red);font-weight:800}

/* ---------- Breadcrumb & page hero ---------- */
.page-hero{background:linear-gradient(115deg,var(--blue-dd),var(--blue-d));color:#fff;padding:46px 0}
.page-hero h1{font-size:34px;font-weight:800}
.page-hero p{opacity:.85;margin-top:8px;max-width:680px}
.crumbs{font-size:13.5px;color:#bcd2e6;margin-bottom:10px}
.crumbs a{color:#fff;opacity:.8}
.crumbs a:hover{opacity:1}

/* ---------- Detail pages ---------- */
.detail-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:start}
.detail-img{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;display:flex;align-items:center;justify-content:center;min-height:340px}
.detail-img img{max-height:380px;object-fit:contain}
.img-note{font-size:12px;color:var(--sub);text-align:center;margin-top:10px}
.detail-info h1{font-size:32px;color:var(--blue-d);margin-bottom:4px}
.detail-info .model-code{font-size:14px;color:var(--red);font-weight:700;letter-spacing:.6px}
.detail-info .d-lead{color:var(--sub);margin:14px 0 18px}
.usp-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.chip{background:#e8f1fa;color:var(--blue-d);font-size:12.5px;font-weight:700;padding:5px 12px;border-radius:20px}
.chip.hot{background:#fdecef;color:var(--red)}
.spec-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px 32px;margin-top:34px}
.panel h2{font-size:24px;color:var(--blue-d);margin-bottom:18px}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top}
.spec-table th{background:#eef4fa;color:var(--blue-d);white-space:nowrap;width:240px;font-weight:700}
.spec-table tr.group td{background:#f7fafd;font-weight:800;color:var(--blue-d);letter-spacing:.4px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.sell-point{margin-bottom:16px}
.sell-point h3{font-size:17px;color:var(--blue-d);margin-bottom:6px}
.sell-point p{font-size:14.5px;color:var(--sub)}

/* ---------- Product listing filter tabs ---------- */
.tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px;justify-content:center}
.tab{padding:9px 20px;border-radius:24px;border:1.5px solid var(--line);font-weight:700;font-size:14px;color:var(--sub);cursor:pointer;background:#fff}
.tab.active,.tab:hover{background:var(--blue);border-color:var(--blue);color:#fff}

/* ---------- News ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.25s;display:block;color:var(--ink)}
.news-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(16,42,67,.16)}
.news-thumb{height:180px;background:linear-gradient(135deg,var(--blue-d),var(--blue));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:20px;text-align:center;padding:20px}
.news-body{padding:20px 22px}
.news-body .n-date{font-size:12.5px;color:var(--sub)}
.news-body h3{font-size:17px;margin:6px 0 8px;color:var(--blue-d)}
.news-body p{font-size:13.5px;color:var(--sub)}

/* ---------- FAQ ---------- */
.faq{max-width:860px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:8px;margin-bottom:12px;box-shadow:var(--shadow)}
.faq summary{padding:16px 20px;font-weight:700;cursor:pointer;color:var(--blue-d);font-size:15.5px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:"+";font-size:22px;color:var(--red);font-weight:400}
.faq details[open] summary::after{content:"−"}
.faq .faq-a{padding:0 20px 18px;color:var(--sub);font-size:14.5px}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px}
.contact-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px}
.contact-box h3{font-size:19px;color:var(--blue-d);margin-bottom:16px}
.c-row{display:flex;gap:14px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:15px}
.c-row:last-child{border-bottom:0}
.c-ico{width:40px;height:40px;border-radius:10px;background:#e8f1fa;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.c-row b{display:block;color:var(--ink)}
.c-row span{color:var(--sub)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-weight:600;font-size:14px;margin-bottom:6px}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:6px;font-size:14.5px;font-family:inherit;background:#fbfcfe}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--blue)}
.tbc-note{display:inline-block;background:#fdf3e0;color:#9a6a00;border:1px dashed #e2b64f;font-size:13px;padding:4px 10px;border-radius:6px;font-weight:600}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(115deg,var(--red),#9e0b24);color:#fff;text-align:center}
.cta-band h2{font-size:30px;margin-bottom:10px}
.cta-band p{opacity:.9;margin-bottom:24px}

/* ---------- Footer ---------- */
footer{background:var(--blue-dd);color:#b9cde0;font-size:14px}
.f-main{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding:54px 0 40px}
.f-main h4{color:#fff;font-size:15.5px;margin-bottom:16px;letter-spacing:.5px}
.f-main ul{list-style:none}
.f-main li{margin-bottom:9px}
.f-main a{color:#b9cde0}
.f-main a:hover{color:#fff}
.f-brand .f-logo{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.f-brand .f-logo span{font-size:20px;font-weight:800;color:#fff}
.f-bottom{border-top:1px solid rgba(255,255,255,.12);padding:18px 0;font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- Floating buttons ---------- */
.float-btns{position:fixed;right:22px;bottom:26px;display:flex;flex-direction:column;gap:12px;z-index:800}
.fb{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:22px;box-shadow:0 6px 18px rgba(16,42,67,.28);transition:.2s}
.fb:hover{transform:translateY(-3px)}
.fb-wa{background:#25d366}
.fb-top{background:var(--blue-d);font-size:18px}

/* ---------- Responsive ---------- */
@media(max-width:1024px){
  .hero .container{grid-template-columns:1fr;padding-top:44px}
  .hero h1{font-size:34px}
  .cat-grid,.sol-grid{grid-template-columns:repeat(2,1fr)}
  .prod-grid,.feat-grid,.news-grid{grid-template-columns:repeat(2,1fr)}
  .stats .container{grid-template-columns:repeat(2,1fr)}
  .split,.detail-wrap,.contact-grid{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .f-main{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  nav.main-nav{position:fixed;top:112px;left:0;right:0;background:#fff;box-shadow:0 10px 24px rgba(16,42,67,.15);display:none;z-index:899}
  nav.main-nav.open{display:block}
  nav.main-nav ul{flex-direction:column;padding:12px 18px;gap:2px}
  .nav-toggle{display:block}
  .cat-grid,.sol-grid,.prod-grid,.feat-grid,.news-grid,.stats .container{grid-template-columns:1fr}
  .f-main{grid-template-columns:1fr}
  .hero h1{font-size:29px}
  .sec-head h2{font-size:25px}
  .form-row{grid-template-columns:1fr}
  .topbar .tb-left span:nth-child(2){display:none}
  .hero-slider{height:470px}
  .slide-content h1{font-size:28px}
  .slide-content p.lead{font-size:15.5px}
  .video-grid{grid-template-columns:1fr}
}
@media(max-width:1024px){
  .hero-slider{height:540px}
  .slide-content h1{font-size:34px}
}