/* ============================================================
   XINWEI 信维车业 — Design tokens & base (inspired by envicool.com)
   ============================================================ */
:root{
  --blue:#003281;
  --blue-deep:#001b4d;
  --blue-ink:#021a3d;
  --blue-mid:#0b4aa2;
  --blue-bright:#1466d2;
  --orange:#f39800;
  --orange-deep:#d98200;
  --ink:#1b2432;
  --text:#2c303d;
  --text-2:#5c6675;
  --text-3:#8a93a3;
  --line:#e4e9f1;
  --line-2:#d5dce7;
  --bg:#f5f7fa;
  --bg-2:#eef2f7;
  --white:#fff;
  --radius:3px;
  --shadow-sm:0 4px 18px rgba(12,30,60,.07);
  --shadow-md:0 16px 44px rgba(9,28,58,.12);
  --shadow-lg:0 30px 80px rgba(5,20,45,.18);
  --container:1200px;
  --font:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:100px}
body{margin:0;font-family:var(--font);font-size:16px;line-height:1.8;color:var(--text);background:var(--white);overflow-x:hidden;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none;transition:color .25s var(--ease)}
button{font-family:inherit;border:0;background:none;cursor:pointer;color:inherit}
input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}
::selection{background:rgba(243,152,0,.25)}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.container-wide{max-width:1440px}

/* ---------- typography helpers ---------- */
.eyebrow{display:inline-flex;align-items:center;gap:12px;font-size:13px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--text-3)}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--orange);display:block;flex:none}
.eyebrow--light{color:rgba(255,255,255,.62)}
.sec-title{font-size:clamp(28px,3.1vw,42px);line-height:1.28;font-weight:700;color:var(--ink);letter-spacing:.01em}
.sec-title em{font-style:normal;color:var(--blue)}
.sec-title--light{color:#fff}
.sec-head{max-width:760px}
.sec-head .sec-title{margin-top:18px}
.sec-desc{margin-top:22px;font-size:16px;line-height:2;color:var(--text-2)}
.sec-desc--light{color:rgba(255,255,255,.68)}
.text-orange{color:var(--orange)!important}
.link-arrow{display:inline-flex;align-items:center;gap:10px;font-size:15px;font-weight:600;color:var(--blue)}
.link-arrow svg{transition:transform .3s var(--ease)}
.link-arrow:hover{color:var(--orange)}
.link-arrow:hover svg{transform:translateX(5px)}

/* ---------- buttons ---------- */
.btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 30px;font-size:15px;font-weight:600;letter-spacing:.02em;border-radius:2px;border:1px solid transparent;transition:all .3s var(--ease);white-space:nowrap}
.btn svg{flex:none;transition:transform .3s var(--ease)}
.btn:hover svg{transform:translateX(4px)}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 10px 26px rgba(243,152,0,.28)}
.btn-primary:hover{background:var(--orange-deep);color:#fff;box-shadow:0 14px 32px rgba(243,152,0,.36)}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--blue-mid);color:#fff}
.btn-outline{border-color:rgba(255,255,255,.4);color:#fff}
.btn-outline:hover{background:#fff;color:var(--blue);border-color:#fff}
.btn-outline-blue{border-color:var(--line-2);color:var(--blue);background:#fff}
.btn-outline-blue:hover{border-color:var(--blue);background:var(--blue);color:#fff}
.btn-sm{min-height:44px;padding:0 22px;font-size:14px}
.btn-block{width:100%}

/* ---------- section frame ---------- */
.section{position:relative;padding:104px 0}
.section--tight{padding:80px 0}
.section--alt{background:var(--bg)}
.section--dark{background:var(--blue-deep);color:#fff;overflow:hidden}
.section--blueprint{background:var(--blue-deep);color:#fff;overflow:hidden}
.section-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-bottom:54px}
.section-head-row .sec-head{max-width:720px}
.section-head-row .head-side{flex:none;padding-bottom:6px}

/* blueprint line texture */
.blueprint-lines{position:absolute;inset:0;pointer-events:none;opacity:.5;background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);background-size:88px 88px;-webkit-mask-image:radial-gradient(ellipse at 70% 30%,#000 0%,transparent 72%);mask-image:radial-gradient(ellipse at 70% 30%,#000 0%,transparent 72%)}
.diag-deco{position:absolute;top:0;right:0;width:46%;height:100%;pointer-events:none;overflow:hidden}
.diag-deco::before,.diag-deco::after{content:"";position:absolute;top:-20%;height:140%;width:1px;background:linear-gradient(180deg,transparent,rgba(255,255,255,.16),transparent);transform:rotate(24deg);transform-origin:top right}
.diag-deco::before{right:22%}
.diag-deco::after{right:6%;background:linear-gradient(180deg,transparent,rgba(243,152,0,.35),transparent)}

/* ---------- topbar ---------- */
.topbar{background:var(--blue-ink);color:rgba(255,255,255,.62);font-size:12.5px;letter-spacing:.02em;position:relative;z-index:60}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:38px}
.topbar p{display:flex;align-items:center;gap:10px}
.topbar p::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange)}
.topbar-links{display:flex;align-items:center;gap:18px}
.topbar-links a{display:inline-flex;align-items:center;gap:7px}
.topbar-links a:hover{color:#fff}
.topbar-links .sep{color:rgba(255,255,255,.18)}

/* ---------- header ---------- */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:box-shadow .3s var(--ease),background .3s var(--ease)}
.header.is-scrolled{box-shadow:0 10px 30px rgba(10,28,58,.08);background:#fff}
.header-inner{display:flex;align-items:center;height:86px;gap:22px}
.logo{display:flex;align-items:center;gap:13px;flex:none}
.logo-mark{width:46px;height:46px;flex:none}
.logo-text{display:flex;flex-direction:column;line-height:1.1}
.logo-text b{font-size:22px;font-weight:700;color:var(--blue);letter-spacing:.06em}
.logo-text span{margin-top:5px;font-size:9.5px;font-weight:600;letter-spacing:.16em;color:var(--text-3)}
.nav{display:flex;align-items:center;gap:2px;margin-left:12px;height:100%}
.nav-link{position:relative;display:flex;align-items:center;gap:5px;height:86px;padding:0 14px;font-size:15px;font-weight:500;color:var(--ink);white-space:nowrap}
.nav-link::after{content:"";position:absolute;left:17px;right:17px;bottom:-1px;height:2px;background:var(--orange);transform:scaleX(0);transform-origin:center;transition:transform .3s var(--ease)}
.nav-link:hover{color:var(--blue)}
.nav-item{position:relative;height:100%}
.nav-link .chev{opacity:.5;transition:transform .3s}
.nav-item:hover .chev{transform:rotate(180deg);opacity:1}
.nav-item:hover>.nav-link{color:var(--blue)}
.nav-item:hover>.nav-link::after{transform:scaleX(1)}
.nav-link.active{color:var(--blue);font-weight:600}
.nav-link.active::after{transform:scaleX(1)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:18px}
.header-tel{display:flex;align-items:center;gap:10px;color:var(--ink)}
.header-tel svg{color:var(--orange)}
.header-tel em{display:block;font-style:normal;font-size:11px;color:var(--text-3);letter-spacing:.1em}
.header-tel b{display:block;font-size:16px;font-weight:700;letter-spacing:.01em;color:var(--blue);white-space:nowrap}
.header-tel:hover b{color:var(--orange)}
.hamburger{display:none;width:44px;height:44px;position:relative;border:1px solid var(--line);border-radius:2px}
.hamburger span{position:absolute;left:12px;width:20px;height:2px;background:var(--ink);transition:all .3s var(--ease)}
.hamburger span:nth-child(1){top:15px}
.hamburger span:nth-child(2){top:21px}
.hamburger span:nth-child(3){top:27px}
body.drawer-open .hamburger span:nth-child(1){top:21px;transform:rotate(45deg)}
body.drawer-open .hamburger span:nth-child(2){opacity:0}
body.drawer-open .hamburger span:nth-child(3){top:21px;transform:rotate(-45deg)}

/* ---------- mega menu ---------- */
.mega{position:absolute;top:100%;left:50%;transform:translate(-50%,10px);width:min(880px,calc(100vw - 60px));background:#fff;box-shadow:0 30px 70px rgba(6,24,52,.16);border-top:2px solid var(--orange);opacity:0;visibility:hidden;transition:all .32s var(--ease);padding:38px 0 34px}
.nav-item:hover .mega{opacity:1;visibility:visible;transform:translate(-50%,0)}
.mega-inner{display:grid;grid-template-columns:1fr 1fr 260px;gap:26px 40px;padding:0 42px}
.mega-group{display:flex;flex-direction:column;gap:2px}
.mega-label{font-size:11px;font-weight:700;letter-spacing:.2em;color:var(--orange);margin-bottom:12px;text-transform:uppercase}
.mega a{display:flex;align-items:baseline;gap:10px;padding:8px 0;font-size:15px;color:var(--ink);border-bottom:1px solid transparent}
.mega a small{font-size:12px;color:var(--text-3)}
.mega a:hover{color:var(--blue);padding-left:4px}
.mega-feature{position:relative;background:linear-gradient(150deg,#00235a,#00418f);color:#fff!important;padding:24px!important;display:flex!important;flex-direction:column;align-items:flex-start!important;gap:10px!important;overflow:hidden}
.mega-feature::after{content:"";position:absolute;right:-40px;bottom:-40px;width:140px;height:140px;border:1px solid rgba(255,255,255,.2);border-radius:50%}
.mega-feature b{font-size:17px;color:#fff}
.mega-feature span{font-size:12.5px;line-height:1.7;color:rgba(255,255,255,.65)}
.mega-feature em{font-style:normal;font-size:12px;font-weight:600;color:var(--orange);margin-top:6px}
.mega-feature:hover{padding-left:28px!important}

/* ---------- drawer (mobile) ---------- */
.drawer{position:fixed;inset:0;z-index:80;visibility:hidden;pointer-events:none}
.drawer-backdrop{position:absolute;inset:0;background:rgba(4,16,36,.55);opacity:0;transition:opacity .3s}
.drawer-panel{position:absolute;top:0;right:0;bottom:0;width:min(360px,86vw);background:#fff;transform:translateX(100%);transition:transform .38s var(--ease);display:flex;flex-direction:column;overflow-y:auto}
body.drawer-open .drawer{visibility:visible;pointer-events:auto}
body.drawer-open .drawer-backdrop{opacity:1}
body.drawer-open .drawer-panel{transform:none}
body.drawer-open{overflow:hidden}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;border-bottom:1px solid var(--line)}
.drawer-close{width:40px;height:40px;display:grid;place-items:center;font-size:24px;color:var(--text-2)}
.drawer-nav{padding:12px 24px 24px}
.drawer-nav a{display:flex;align-items:center;justify-content:space-between;padding:15px 0;border-bottom:1px solid var(--line);font-size:16px;font-weight:500}
.drawer-nav .sub{padding-left:16px;font-size:14px;color:var(--text-2);border-bottom:1px dashed #edf0f5}
.drawer-contact{margin-top:auto;padding:24px;background:var(--bg);border-top:1px solid var(--line)}
.drawer-contact .btn{width:100%}
.drawer-contact p{font-size:13px;color:var(--text-2);margin-top:14px}

/* ---------- page banner ---------- */
.page-hero{position:relative;background:linear-gradient(118deg,#001b4d 0%,#003281 62%,#0a4595 100%);color:#fff;overflow:hidden}
.page-hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.28;filter:grayscale(1) contrast(1.08)}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,20,50,.9) 0%,rgba(0,32,74,.66) 46%,rgba(0,32,74,.3) 100%)}
.page-hero-inner{position:relative;z-index:2;padding:88px 0 72px}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:12.5px;color:rgba(255,255,255,.55);letter-spacing:.03em}
.breadcrumb a:hover{color:#fff}
.breadcrumb .sep{opacity:.4}
.page-hero h1{margin-top:26px;font-size:clamp(32px,4.2vw,52px);line-height:1.25;font-weight:700;letter-spacing:.01em}
.page-hero .hero-sub{margin-top:18px;max-width:700px;font-size:16px;line-height:1.95;color:rgba(255,255,255,.72)}
.page-hero .hero-sub strong{color:#fff;font-weight:600}
.page-hero-meta{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.chip{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;font-size:12.5px;color:rgba(255,255,255,.85);border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.05);border-radius:100px}
.chip::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--orange)}
.page-hero--product{padding-bottom:0}
.page-hero--product .page-hero-inner{padding-bottom:58px}

/* ---------- scroll reveal ---------- */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.js .reveal.is-in{opacity:1;transform:none}
.js .reveal-delay-1{transition-delay:.08s}
.js .reveal-delay-2{transition-delay:.16s}
.js .reveal-delay-3{transition-delay:.24s}
.js .reveal-delay-4{transition-delay:.32s}

/* ---------- footer ---------- */
.footer{background:#02152f;color:rgba(255,255,255,.6);font-size:14px;position:relative;overflow:hidden}
.footer::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(243,152,0,.7),transparent)}
.footer-main{position:relative;display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 230px;gap:44px;padding:72px 0 58px}
.footer-brand .logo-text b{color:#fff}
.footer-brand .logo-text span{color:rgba(255,255,255,.4)}
.footer-brand p{margin-top:22px;font-size:13.5px;line-height:2;color:rgba(255,255,255,.5);max-width:320px}
.footer-contact{margin-top:24px;display:flex;flex-direction:column;gap:10px}
.footer-contact span{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;color:rgba(255,255,255,.62)}
.footer-contact svg{flex:none;margin-top:5px;color:var(--orange)}
.footer-col h4{font-size:14px;font-weight:600;letter-spacing:.08em;color:#fff;margin-bottom:22px;position:relative;padding-bottom:12px}
.footer-col h4::after{content:"";position:absolute;left:0;bottom:0;width:22px;height:2px;background:var(--orange)}
.footer-col a{display:block;padding:7px 0;font-size:13.5px;color:rgba(255,255,255,.55)}
.footer-col a:hover{color:#fff;padding-left:4px}
.footer-qr{text-align:left}
.footer-qr .qr{width:104px;height:104px;background:#fff;border-radius:4px;padding:7px}
.footer-qr p{margin-top:12px;font-size:12px;color:rgba(255,255,255,.45);line-height:1.7}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:22px 0;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:12.5px;color:rgba(255,255,255,.4)}
.footer-bottom a{color:rgba(255,255,255,.4)}
.footer-bottom a:hover{color:#fff}
.footer-bottom .fb-links{display:flex;gap:20px}
.footer-seo{padding:0 0 26px;font-size:11.5px;line-height:1.9;color:rgba(255,255,255,.25);max-width:900px}

/* ---------- side rail ---------- */
.side-rail{position:fixed;right:18px;bottom:80px;z-index:40;display:flex;flex-direction:column;gap:8px}
.side-rail a,.side-rail button{width:48px;height:48px;display:grid;place-items:center;background:#fff;border:1px solid var(--line);border-radius:3px;color:var(--blue);box-shadow:var(--shadow-sm);transition:all .25s var(--ease);position:relative}
.side-rail a:hover,.side-rail button:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.side-rail .tip{position:absolute;right:calc(100% + 10px);top:50%;transform:translateY(-50%) translateX(6px);background:var(--blue-deep);color:#fff;font-size:12px;padding:6px 12px;border-radius:2px;white-space:nowrap;opacity:0;visibility:hidden;transition:all .25s var(--ease)}
.side-rail a:hover .tip,.side-rail button:hover .tip{opacity:1;visibility:visible;transform:translateY(-50%)}
.side-rail .rail-tel{background:var(--orange);border-color:var(--orange);color:#fff}
.side-rail .rail-tel:hover{background:var(--orange-deep)}
#toTop{opacity:0;visibility:hidden;transform:translateY(8px)}
#toTop.show{opacity:1;visibility:visible;transform:none}

/* ---------- modal / toast ---------- */
.modal{position:fixed;inset:0;z-index:90;display:grid;place-items:center;padding:24px;visibility:hidden;pointer-events:none}
.modal-backdrop{position:absolute;inset:0;background:rgba(3,14,32,.62);opacity:0;transition:opacity .3s}
.modal-panel{position:relative;background:#fff;width:min(780px,100%);max-height:84vh;overflow-y:auto;border-radius:4px;transform:translateY(18px) scale(.98);opacity:0;transition:all .32s var(--ease);box-shadow:var(--shadow-lg)}
.modal.is-open{visibility:visible;pointer-events:auto}
.modal.is-open .modal-backdrop{opacity:1}
.modal.is-open .modal-panel{transform:none;opacity:1}
.modal-close{position:absolute;top:14px;right:14px;width:40px;height:40px;display:grid;place-items:center;background:rgba(255,255,255,.9);border-radius:50%;font-size:22px;color:var(--ink);z-index:2}
.modal-close:hover{background:var(--orange);color:#fff}
.modal-body{padding:0}
.modal-media{height:300px;background-size:cover;background-position:center}
.modal-content{padding:32px 40px 40px}
.modal-content h3{font-size:24px;line-height:1.4;color:var(--ink);margin-bottom:14px}
.modal-meta{font-size:12.5px;color:var(--text-3);letter-spacing:.05em;margin-bottom:20px}
.modal-content p{margin-bottom:14px;color:var(--text-2);font-size:15px;line-height:1.95}
.toast{position:fixed;left:50%;bottom:40px;transform:translate(-50%,20px);background:var(--blue-deep);color:#fff;padding:14px 26px;border-radius:3px;font-size:14px;opacity:0;visibility:hidden;transition:all .3s var(--ease);z-index:100;box-shadow:var(--shadow-md)}
.toast.show{opacity:1;visibility:visible;transform:translate(-50%,0)}

/* ---------- misc ---------- */
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;font-size:12px;border-radius:2px;background:rgba(0,50,129,.07);color:var(--blue)}
.tag--orange{background:rgba(243,152,0,.12);color:var(--orange-deep)}
.divider-line{height:1px;background:var(--line);border:0;margin:0}
.mt-0{margin-top:0}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}.mt-40{margin-top:40px}.mt-48{margin-top:48px}
.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mb-32{margin-bottom:32px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media (max-width:1360px){
  .header-tel{display:none}
}
@media (max-width:1200px){
  .nav-link{padding:0 11px;font-size:14.5px}
  .header-inner{gap:18px}
  .header-tel{display:none}
  .footer-main{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
  .footer-qr{display:none}
}
@media (max-width:1024px){
  .section{padding:84px 0}
  .nav{display:none}
  .hamburger{display:block}
  .header-actions .btn-quote{display:none}
  .header-inner{height:74px}
  .page-hero-inner{padding:64px 0 54px}
  .section-head-row{flex-direction:column;align-items:flex-start;gap:18px;margin-bottom:40px}
  .footer-main{grid-template-columns:1fr 1fr;gap:36px;padding:56px 0 42px}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:768px){
  body{font-size:15px}
  .container{padding:0 20px}
  .section{padding:64px 0}
  .section--tight{padding:56px 0}
  .topbar-inner{height:34px;font-size:11.5px}
  .topbar p{display:none}
  .topbar-inner{justify-content:center}
  .topbar-links{gap:14px}
  .logo-mark{width:40px;height:40px}
  .logo-text b{font-size:18px}
  .logo-text span{font-size:8px;letter-spacing:.12em}
  .header-inner{height:66px;gap:14px}
  .page-hero h1{margin-top:20px}
  .page-hero .hero-sub{font-size:14.5px}
  .sec-title{font-size:29px}
  .sec-desc{font-size:14.5px}
  .btn{min-height:48px;padding:0 22px;font-size:14px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-seo{font-size:10.5px}
  .side-rail{right:12px;bottom:20px}
  .side-rail a,.side-rail button{width:42px;height:42px}
  .modal-media{height:200px}
  .modal-content{padding:24px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

.header .logo-mark{width:50px;height:50px}
@media (max-width:768px){.header .logo-mark{width:40px;height:40px}}


/* language switch */
.lang-link{display:inline-flex;align-items:center;height:22px;padding:0 8px;border:1px solid rgba(255,255,255,.28);border-radius:2px;font-size:11px;letter-spacing:.06em;line-height:1;color:inherit;transition:all .25s}
.lang-link:hover{border-color:var(--orange);color:#fff}
.drawer-contact .lang-link{color:var(--blue);border-color:var(--line-2);height:30px;padding:0 12px}