/* ============================================================
   YICHENGMING — Высокопрочный крепёж / 俄语 B2B 独立站
   主色 #1F3A5F 钢蓝 · 强调 #E87722 工业橙 · 底色 #F4F6F8
   ============================================================ */

:root{
  --blue:#1F3A5F;
  --blue-deep:#14243A;
  --blue-night:#0E1B2C;
  --orange:#E87722;
  --orange-dark:#C85F13;
  --ink:#1F2730;
  --grey:#6B7683;
  --line:#E2E7EB;
  --line-soft:#EDF1F4;
  --bg:#F4F6F8;
  --white:#fff;
  --shadow-sm:0 2px 10px rgba(18,36,58,.06);
  --shadow-md:0 14px 34px rgba(18,36,58,.10);
  --shadow-lg:0 26px 60px rgba(11,22,38,.16);
  --r:2px;
  --container:1280px;
  --font:"Montserrat","Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;background:var(--white);color:var(--ink);
  font-family:var(--font);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
button{font-family:inherit;}
h1,h2,h3,h4,p{margin:0;}
::selection{background:var(--orange);color:#fff;}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 28px;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  height:50px;padding:0 28px;border:1px solid transparent;border-radius:var(--r);
  font-size:13.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  cursor:pointer;transition:.25s ease;white-space:nowrap;
}
.btn svg{flex:0 0 auto;}
.btn--primary{background:var(--orange);color:#fff;}
.btn--primary:hover{background:var(--orange-dark);transform:translateY(-2px);box-shadow:0 12px 26px rgba(232,119,34,.30);}
.btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.45);}
.btn--ghost:hover{background:rgba(255,255,255,.10);border-color:#fff;transform:translateY(-2px);}
.btn--blue{background:var(--blue);color:#fff;}
.btn--blue:hover{background:var(--blue-night);transform:translateY(-2px);box-shadow:var(--shadow-md);}
.btn--line{background:transparent;color:var(--blue);border-color:#CBD5DF;}
.btn--line:hover{border-color:var(--blue);background:var(--blue);color:#fff;}
.btn--sm{height:42px;padding:0 20px;font-size:12px;}

/* ---------- top bar ---------- */
.topbar{background:var(--blue-night);color:#B9C4D2;font-size:12.5px;letter-spacing:.01em;}
.topbar__row{display:flex;align-items:center;justify-content:space-between;height:42px;gap:20px;}
.topbar__left{display:flex;align-items:center;gap:26px;flex-wrap:wrap;}
.topbar__item{display:inline-flex;align-items:center;gap:8px;transition:.2s;}
.topbar__item:hover{color:#fff;}
.topbar__item svg{opacity:.65;}
.topbar__right{display:flex;align-items:center;gap:18px;}
.lang{display:none;align-items:center;gap:2px;font-size:12px;font-weight:600;}
.lang a{padding:3px 7px;border-radius:2px;color:#9AA6B6;transition:.2s;letter-spacing:.06em;}
.lang a:hover{color:#fff;}
.lang a.is-active{color:#fff;background:rgba(255,255,255,.12);}
.topbar__sep{width:1px;height:14px;background:rgba(255,255,255,.16);}

/* ---------- header ---------- */
.header{
  position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(1.3) blur(8px);
  border-bottom:1px solid var(--line);transition:.3s ease;
}
.header.is-scrolled{box-shadow:0 8px 26px rgba(18,36,58,.10);}
.nav{display:flex;align-items:center;gap:34px;height:78px;}
.nav__logo{display:flex;align-items:center;gap:12px;flex:0 0 auto;}
.nav__logo svg{display:block;}
.logo__img{display:block;height:40px;width:auto;}
.footer__brand .logo__img{height:38px;}
.logo__text{display:flex;flex-direction:column;line-height:1;}
.logo__name{font-size:20px;font-weight:800;letter-spacing:.11em;color:var(--blue);}
.logo__sub{font-size:9.5px;font-weight:600;letter-spacing:.22em;color:var(--grey);margin-top:5px;}
.nav__menu{display:flex;align-items:center;gap:4px;margin-left:auto;}
.nav__menu > li > a{
  display:inline-flex;align-items:center;gap:5px;padding:10px 13px;border-radius:2px;
  font-size:14px;font-weight:600;color:#2C3644;transition:.2s;letter-spacing:.005em;white-space:nowrap;
}
.nav__menu > li > a:hover{color:var(--orange);}
.nav__menu > li > a::after{content:"";display:block;}
.nav__menu .has-drop{position:relative;}
.nav__menu .has-drop > a svg{transition:.25s;}
.has-drop:hover > a svg{transform:rotate(180deg);}
.nav__dropdown{
  position:absolute;top:calc(100% + 10px);left:-8px;min-width:290px;padding:10px;
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-md);
  opacity:0;visibility:hidden;transform:translateY(8px);transition:.25s ease;
}
.has-drop:hover .nav__dropdown{opacity:1;visibility:visible;transform:translateY(0);}
.nav__dropdown a{
  display:block;padding:9px 12px;font-size:13.2px;color:#39434F;border-radius:2px;transition:.18s;
}
.nav__dropdown a:hover{background:var(--bg);color:var(--blue);padding-left:16px;}
.nav__cta{margin-left:6px;height:46px;padding:0 22px;font-size:12.5px;}
.nav__toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;position:relative;}
.nav__toggle span{position:absolute;left:12px;width:20px;height:2px;background:var(--blue);transition:.25s;}
.nav__toggle span:nth-child(1){top:15px;}
.nav__toggle span:nth-child(2){top:21px;}
.nav__toggle span:nth-child(3){top:27px;}
.nav__toggle.is-open span:nth-child(1){top:21px;transform:rotate(45deg);}
.nav__toggle.is-open span:nth-child(2){opacity:0;}
.nav__toggle.is-open span:nth-child(3){top:21px;transform:rotate(-45deg);}

/* ---------- hero slider ---------- */
.slider{position:relative;height:clamp(560px,76vh,760px);overflow:hidden;background:var(--blue-night);}
.slide{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:0;visibility:hidden;transition:opacity .9s ease,visibility .9s;z-index:1;
}
.slide.is-active{opacity:1;visibility:visible;z-index:2;}
.slide::before{
  content:"";position:absolute;inset:0;
  background:none;
}
.slide__inner{position:relative;z-index:3;height:100%;display:flex;align-items:center;}
.slide__content{width:100%;max-width:1280px;margin:0 auto;padding:0 28px 40px;}
.slide__content > :not(.slide__actions){max-width:735px;}
.slide__label{
  display:inline-flex;align-items:center;gap:10px;margin-bottom:22px;
  font-size:11.5px;font-weight:700;letter-spacing:.20em;text-transform:uppercase;color:#F0A05A;
}
.slide__label::before{content:"";width:34px;height:1px;background:var(--orange);}
.slide h1{
  color:#fff;font-size:clamp(26px,2.8vw,44px);line-height:1.14;font-weight:800;
  letter-spacing:-.012em;margin-bottom:22px;text-wrap:balance;max-width:768px;
  text-shadow:0 2px 22px rgba(4,10,18,.42),0 1px 3px rgba(4,10,18,.28);
}
.slide h2{
  display:block;color:rgba(255,255,255,.84);font-size:clamp(15px,1.25vw,19px);line-height:1.6;
  font-weight:500;letter-spacing:.01em;margin-bottom:14px;max-width:600px;
  text-shadow:0 1px 14px rgba(4,10,18,.48);
}
.slide p{color:#C6D0DC;font-size:15.5px;line-height:1.8;max-width:600px;margin-bottom:22px;}
.slide__tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:34px;}
.tag{
  display:inline-flex;align-items:center;gap:7px;padding:7px 13px;
  border:1px solid rgba(255,255,255,.24);background:rgba(255,255,255,.06);
  font-size:12px;font-weight:600;letter-spacing:.03em;color:#E4EAF1;
}
.tag svg{color:var(--orange);}
.slide__actions{display:flex;flex-wrap:wrap;gap:14px;}

.slider__nav{position:absolute;z-index:5;top:50%;left:0;right:0;transform:translateY(-50%);
  display:flex;justify-content:space-between;padding:0 26px;pointer-events:none;}
.slider__btn{
  pointer-events:auto;
  width:46px;height:46px;display:grid;place-items:center;cursor:pointer;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.28);color:#fff;
  transition:.22s;
}
.slider__btn:hover{background:var(--orange);border-color:var(--orange);}

.slider__bottom{
  position:absolute;left:0;right:0;bottom:0;z-index:5;padding:0 0 26px;
}
.slider__bottom .container{
  position:relative;display:flex;align-items:flex-end;justify-content:flex-start;
}
.slider__steps{display:flex;gap:0;width:100%;max-width:680px;margin:0;}
.step{flex:1;cursor:pointer;position:relative;}
.step__bar{height:4px;background:rgba(255,255,255,.24);position:relative;overflow:hidden;transition:background .25s;}
.step:hover .step__bar{background:rgba(255,255,255,.46);}
.step__bar i{
  position:absolute;left:0;top:0;height:100%;width:0;background:var(--orange);display:block;
}
.step.is-active .step__bar i{animation:stepFill 8s linear forwards;}
@keyframes stepFill{from{width:0;}to{width:100%;}}
.step__nm{
  display:block;font-size:12.5px;font-weight:600;color:rgba(255,255,255,.45);
  margin-top:13px;letter-spacing:.02em;transition:.2s;
}
.step.is-active .step__nm{color:#F0A05A;}
.slider__scroll{
  position:absolute;right:28px;bottom:0;
  display:inline-flex;align-items:center;gap:10px;font-size:11.5px;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.55);
}
.slider__scroll svg{animation:bob 2.2s ease-in-out infinite;}
@keyframes bob{0%,100%{transform:translateY(0);}50%{transform:translateY(5px);}}

/* ---------- trust strip ---------- */
.trust{background:#fff;padding:34px 0 38px;}
.trust__row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.trust__item{
  background:#fff;border:1px solid var(--line);border-top:2px solid var(--orange);
  border-radius:10px;padding:22px 22px 22px;
  box-shadow:0 6px 20px rgba(15,25,40,.06);
  transition:transform .25s ease, box-shadow .25s ease;
}
.trust__item:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(15,25,40,.10);}
.trust__item strong{display:block;font-size:16px;font-weight:700;color:var(--blue);letter-spacing:.005em;margin-bottom:10px;line-height:1.25;}
.trust__item > div > span:last-child{display:block;font-size:14px;color:var(--grey);line-height:1.6;}

/* ---------- section scaffolding ---------- */
.section{padding:92px 0;}
.section--tight{padding:76px 0;}
.section--soft{background:var(--bg);}
.section--dark{background:var(--blue-night);color:#D6DEE8;}
.section__head{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-bottom:52px;}
.section__head-main{max-width:760px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;font-size:11.5px;font-weight:700;
  letter-spacing:.19em;text-transform:uppercase;color:var(--orange);margin-bottom:14px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--orange);display:block;}
.section h2{font-size:clamp(24px,2.4vw,34px);line-height:1.2;font-weight:800;color:var(--blue);letter-spacing:-.01em;}
.section--dark h2{color:#fff;}
.section__desc{margin-top:16px;font-size:15px;line-height:1.8;color:var(--grey);max-width:700px;}
.section--dark .section__desc{color:#A8B5C4;}
.section__link{
  display:inline-flex;align-items:center;gap:9px;font-size:13px;font-weight:700;
  letter-spacing:.04em;color:var(--blue);border-bottom:1px solid var(--line);padding-bottom:6px;
  transition:.2s;white-space:nowrap;
}
.section__link:hover{color:var(--orange);border-color:var(--orange);gap:14px;}
.section__link svg{transition:.2s;}
.section__link:hover svg{transform:translateX(3px);}

/* ---------- advantages ---------- */
.adv{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.adv__card{
  position:relative;background:#fff;border:1px solid var(--line);border-top:3px solid var(--orange);
  padding:30px 26px 32px;transition:.3s ease;
}
.adv__card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#D3DCE5;border-top-color:var(--orange);}
.adv__ico{width:44px;height:44px;display:grid;place-items:center;background:var(--bg);color:var(--blue);margin-bottom:20px;}
.adv__card h3{font-size:16px;font-weight:700;color:var(--blue);letter-spacing:.005em;margin-bottom:6px;}
.adv__card .ru{font-size:11.5px;font-weight:600;color:var(--grey);letter-spacing:.05em;text-transform:uppercase;margin-bottom:14px;}
.adv__card p{font-size:13.5px;line-height:1.8;color:#4C5764;}

/* ---------- categories ---------- */
.cat{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.cat__card{
  background:#F4F6F8;border:1px solid #E2E7EB;border-radius:10px;display:flex;flex-direction:column;
  transition:.3s ease;overflow:hidden;
}
.cat__card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#CFD9E2;}
.cat__media{position:relative;overflow:hidden;aspect-ratio:4/3;background:transparent;display:grid;place-items:center;padding:18px;}
.cat__media img{width:100%;height:100%;object-fit:contain;transition:transform .6s cubic-bezier(.22,.61,.36,1);}
.cat__card:hover .cat__media img{transform:scale(1.05);}
.cat__body{
  padding:14px 18px 18px;display:flex;flex-direction:column;gap:10px;flex:1;
}
.cat__name{font-size:15.5px;font-weight:700;color:var(--blue);line-height:1.3;letter-spacing:-.005em;}
.cat__row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:auto;}
.cat__ru{font-size:12px;font-weight:500;color:#8D99A7;letter-spacing:.01em;line-height:1.45;flex:1;min-width:0;}
.cat__more{
  flex:0 0 auto;background:var(--blue);color:#fff;font-size:12.5px;font-weight:600;
  padding:8px 14px;border-radius:6px;letter-spacing:.01em;white-space:nowrap;
  transition:background .25s ease;
}
.cat__card:hover .cat__more{background:var(--orange);}
.cat__total{
  border:1px dashed #C9D4DE;background:var(--bg);display:flex;flex-direction:column;
  justify-content:center;align-items:flex-start;padding:34px 30px;gap:8px;
}
.cat__total .big{font-size:34px;font-weight:800;color:var(--blue);letter-spacing:-.02em;}
.cat__total span{font-size:12.8px;color:var(--grey);line-height:1.7;}
.cat__total a{margin-top:12px;font-size:12.5px;font-weight:700;color:var(--orange);letter-spacing:.05em;display:inline-flex;gap:8px;align-items:center;}

/* ---------- industries ---------- */
.ind{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.ind__card{position:relative;overflow:hidden;aspect-ratio:4/3;background:var(--blue-deep);display:block;border-radius:10px;}
.ind__card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.22,.61,.36,1);}
.ind__card::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(9,17,29,0) 40%,rgba(9,17,29,.55) 78%,rgba(9,17,29,.85) 100%);
  transition:background .35s ease;
}
.ind__card:hover::after{
  background:linear-gradient(180deg,rgba(9,17,29,.15) 0%,rgba(9,17,29,.55) 45%,rgba(9,17,29,.92) 100%);
}
.ind__card:hover img{transform:scale(1.06);}
.ind__body{position:absolute;left:0;right:0;bottom:0;z-index:3;padding:22px 24px 20px;}
.ind__body h3{font-size:17px;font-weight:700;color:#fff;line-height:1.35;}
.ind__body .ru{font-size:11.5px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:#F0A05A;margin-bottom:8px;}
.ind__body p{font-size:12.6px;line-height:1.65;color:rgba(255,255,255,.82);margin-top:8px;}
.ind__body .go{
  margin-top:12px;display:inline-flex;align-items:center;gap:8px;font-size:11.5px;font-weight:700;
  letter-spacing:.10em;text-transform:uppercase;color:#F0A05A;
}
.ind__body .ru, .ind__body p, .ind__body .go{
  display:none;
}
.ind__card:hover .ru, .ind__card:hover p, .ind__card:hover .go{
  display:block;
}
.ind__card:hover .go{display:inline-flex;}

/* ---------- about ---------- */
.about{display:grid;grid-template-columns:1.02fr 1fr;gap:64px;align-items:center;}
.about__media{position:relative;}
.about__media img{width:100%;height:auto;display:block;object-fit:cover;}
.about__media::before{
  content:"";position:absolute;left:-14px;top:-14px;width:86px;height:86px;
  border-left:3px solid var(--orange);border-top:3px solid var(--orange);
}
.about__badge{
  position:absolute;right:0;bottom:0;background:var(--blue);color:#fff;padding:18px 24px;
}
.about__badge b{display:block;font-size:22px;font-weight:800;letter-spacing:.02em;line-height:1;}
.about__badge span{display:block;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:#A9B7C7;margin-top:7px;}
.about h2{margin-bottom:8px;}
.about__slogan{font-size:16px;font-weight:600;color:var(--orange);margin-bottom:20px;letter-spacing:.005em;}
.about p + p{margin-top:14px;}
.about p{font-size:14.5px;line-height:1.85;color:#49525F;}
.about__facts{list-style:none;margin:24px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:14px 28px;}
.about__facts li{position:relative;padding-left:26px;font-size:13.5px;line-height:1.55;color:#49525F;}
.about__facts li::before{
  content:"✓";position:absolute;left:0;top:1px;
  width:18px;height:18px;border-radius:50%;
  background:var(--blue);color:#fff;
  font-size:11px;font-weight:700;
  display:grid;place-items:center;line-height:1;
}
.about__facts b{color:var(--blue);font-weight:700;margin-right:6px;}

/* ---------- hot products ---------- */
.hot{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.hot__card{background:#fff;border:1px solid var(--line);transition:.3s ease;}
.hot__card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.hot__media{aspect-ratio:1/1;overflow:hidden;background:#FBFCFD;border-bottom:1px solid var(--line-soft);}
.hot__media img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.22,.61,.36,1);}
.hot__card:hover .hot__media img{transform:scale(1.06);}
.hot__body{padding:18px 18px 20px;}
.hot__name{font-size:14.6px;font-weight:700;color:var(--blue);line-height:1.4;}
.hot__meta{margin-top:8px;font-size:12px;color:var(--grey);line-height:1.7;}
.hot__std{
  display:inline-block;margin-top:10px;padding:3px 8px;background:var(--bg);
  font-size:11px;font-weight:700;letter-spacing:.04em;color:#55606D;
}

/* ---------- standards ---------- */
.std__wrap{background:#fff;border:1px solid var(--line);overflow:hidden;}
.std__head{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 26px;border-bottom:1px solid var(--line);background:var(--bg);}
.std__head h3{font-size:14.5px;font-weight:700;color:var(--blue);}
.std__head span{font-size:12px;color:var(--grey);}
.std__wrap table{width:100%;border-collapse:collapse;font-size:13.4px;table-layout:fixed;}
.std__wrap thead th{
  background:var(--blue-night);color:#fff;font-size:11.5px;font-weight:700;letter-spacing:.10em;
  text-transform:uppercase;padding:14px 18px;text-align:left;white-space:nowrap;
}
.std__wrap tbody td{padding:13px 18px;border-bottom:1px solid var(--line-soft);color:#3A4552;vertical-align:middle;}
.std__wrap tbody tr:last-child td{border-bottom:0;}
.std__wrap tbody tr:nth-child(even){background:#FBFCFD;}
.std__wrap tbody tr:hover{background:#F3F7FA;}
.std__wrap td:first-child{font-weight:600;color:var(--blue);}
.std__wrap td.code{font-feature-settings:"tnum";letter-spacing:.01em;font-weight:600;color:#2C3644;white-space:nowrap;}
.std__wrap td.muted{color:#A2ADB8;white-space:nowrap;}
.std__wrap td:first-child{white-space:normal;}

/* ---------- oem band ---------- */
.oem{position:relative;color:#fff;overflow:hidden;background:var(--blue-night);}
.oem::before{
  content:"";position:absolute;inset:0;
  background:url("../images/oem-banner.jpg") center/cover no-repeat;
  opacity:.38;
}
.oem::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(11,22,38,.88) 0%,rgba(11,22,38,.82) 50%,rgba(11,22,38,.88) 100%);
}
.oem h2{color:#fff;}
.oem .section__desc{color:rgba(255,255,255,.60);}
.oem .eyebrow{color:#F0A05A;}
.oem .container{position:relative;z-index:2;}
.oem__grid{
  display:grid;grid-template-columns:repeat(6,1fr);gap:18px;
  margin-top:48px;
}
.oem__step{
  position:relative;text-align:center;
  padding:32px 18px 26px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.10);
  border-radius:12px;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:transform .3s ease, border-color .3s ease, background .3s ease, box-shadow .3s ease;
  overflow:hidden;
}
.oem__step::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:0;height:2px;background:var(--orange);
  transition:width .35s ease;
}
.oem__step:hover{
  transform:translateY(-6px);
  border-color:rgba(240,160,90,.55);
  background:rgba(255,255,255,.06);
  box-shadow:0 12px 30px rgba(0,0,0,.35);
}
.oem__step:hover::before{width:60%;}
.oem__dot{
  width:48px;height:48px;border-radius:50%;margin:0 auto 16px;
  background:rgba(255,255,255,.05);border:1.5px solid rgba(240,160,90,.55);
  display:grid;place-items:center;
  transition:.3s ease;
}
.oem__dot span{font-size:13px;font-weight:800;color:#F0A05A;letter-spacing:.04em;}
.oem__step:hover .oem__dot{
  background:var(--orange);border-color:var(--orange);
  box-shadow:0 0 0 6px rgba(240,160,90,.15);
}
.oem__step:hover .oem__dot span{color:#fff;}
.oem__step h3{font-size:14.8px;font-weight:700;color:#fff;margin-bottom:8px;}
.oem__step p{font-size:12px;line-height:1.65;color:#9AA8B8;}

@media(max-width:1280px){
  .oem__grid{grid-template-columns:repeat(3,1fr);gap:16px;}
}
@media(max-width:640px){
  .oem__grid{grid-template-columns:repeat(2,1fr);}
}

/* ---------- oem banner ---------- */
.oem-banner{margin:0;line-height:0;overflow:hidden;}
.oem-banner img{width:100%;height:auto;display:block;}

/* ---------- faq ---------- */
.faq{display:grid;grid-template-columns:.78fr 1.22fr;gap:60px;align-items:start;}
.faq__aside{position:sticky;top:100px;}
.faq__aside h2{margin-bottom:16px;}
.faq__aside p{font-size:14px;line-height:1.85;color:var(--grey);margin-bottom:26px;}
.faq__mini{border-top:1px solid var(--line);padding-top:22px;margin-top:8px;}
.faq__mini li{display:flex;gap:12px;padding:11px 0;font-size:12.8px;color:#4C5764;}
.faq__mini svg{color:var(--orange);flex:0 0 auto;margin-top:3px;}
.acc{border-top:1px solid var(--line);}
.acc__item{border-bottom:1px solid var(--line);}
.acc__q{
  width:100%;display:flex;align-items:flex-start;gap:18px;padding:22px 4px;background:none;border:0;
  text-align:left;cursor:pointer;transition:.2s;
}
.acc__q:hover{color:var(--orange);}
.acc__no{flex:0 0 auto;font-size:11.5px;font-weight:800;color:#B3BDC8;padding-top:3px;letter-spacing:.06em;}
.acc__t{flex:1;font-size:15px;font-weight:600;color:var(--blue);line-height:1.55;}
.acc__q:hover .acc__t{color:var(--orange);}
.acc__ic{flex:0 0 auto;width:26px;height:26px;position:relative;margin-top:2px;}
.acc__ic::before,.acc__ic::after{content:"";position:absolute;background:var(--orange);transition:.25s;}
.acc__ic::before{left:0;top:12px;width:26px;height:2px;}
.acc__ic::after{left:12px;top:0;width:2px;height:26px;}
.acc__item.is-open .acc__ic::after{transform:scaleY(0);}
.acc__a{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.acc__a p{padding:0 44px 24px;font-size:13.6px;line-height:1.85;color:#54606D;}

/* ---------- inquiry ---------- */
.inq{display:grid;grid-template-columns:1.18fr .82fr;gap:56px;align-items:start;}
.inq__form{background:#fff;border:1px solid var(--line);padding:38px 36px 36px;}
.form__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px 20px;}
.field{display:flex;flex-direction:column;gap:7px;}
.field--full{grid-column:1 / -1;}
.field label{font-size:11.6px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:#5A6572;}
.field label i{color:var(--orange);font-style:normal;}
.field input,.field select,.field textarea{
  width:100%;height:46px;padding:0 13px;border:1px solid #DCE3E9;background:#fff;
  font-family:inherit;font-size:13.6px;color:var(--ink);border-radius:0;outline:none;transition:.2s;
}
.field textarea{height:92px;padding:11px 13px;resize:vertical;line-height:1.6;}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(31,58,95,.08);}
.field input::placeholder,.field textarea::placeholder{color:#A7B2BD;}
.field select{appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' fill='none' stroke='%236B7683' stroke-width='1.6'/></svg>");background-repeat:no-repeat;background-position:right 13px center;}
.field--file{position:relative;}
.field--file input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;height:100%;}
.filebox{
  display:flex;align-items:center;gap:12px;height:46px;padding:0 13px;border:1px dashed #C8D3DE;
  font-size:12.6px;color:#78838F;background:#FBfCFD;
}
.filebox svg{color:var(--blue);flex:0 0 auto;}
.form__foot{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:24px;flex-wrap:wrap;}
.form__note{font-size:11.6px;color:#98A3AE;line-height:1.6;max-width:340px;}
.form__done{
  display:none;margin-top:18px;padding:14px 16px;border-left:3px solid var(--orange);
  background:#FFF7F1;font-size:13px;color:#8A5423;
}
.form__done.is-on{display:block;}

.inq__side{position:sticky;top:100px;}
.contactcard{background:var(--blue-night);color:#CBD6E2;padding:36px 34px;}
.contactcard h3{font-size:15px;font-weight:700;color:#fff;letter-spacing:.02em;margin-bottom:6px;}
.contactcard > p{font-size:12.6px;color:#8B99A9;line-height:1.7;margin-bottom:26px;}
.contactcard__row{display:flex;gap:13px;padding:15px 0;border-top:1px solid rgba(255,255,255,.10);}
.contactcard__row svg{flex:0 0 auto;color:var(--orange);margin-top:3px;}
.contactcard__row b{display:block;font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#7D8B9B;}
.contactcard__row span{display:block;font-size:13.6px;color:#E7EDF4;margin-top:4px;line-height:1.55;}
.contactcard__row span em{font-style:normal;color:#8B99A9;font-size:12.4px;}
.contactcard__promise{
  margin-top:26px;padding:18px;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.10);
  border-left:2px solid var(--orange);
  font-size:12.6px;line-height:1.75;color:rgba(255,255,255,.72);
}

/* ---------- cta band ---------- */
.ctaband{position:relative;overflow:hidden;background:var(--blue-deep);}
.ctaband img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
.ctaband::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,22,38,.82) 0%,rgba(11,22,38,.78) 50%,rgba(11,22,38,.82) 100%);}
.ctaband .container{position:relative;z-index:2;padding-top:74px;padding-bottom:74px;text-align:center;}
.ctaband h2{color:#fff;font-size:clamp(22px,2.2vw,30px);font-weight:800;line-height:1.25;max-width:1100px;margin:0 auto;letter-spacing:-.01em;white-space:nowrap;}
.ctaband p{color:#B7C3D1;font-size:14.5px;line-height:1.7;max-width:1000px;margin:14px auto 0;}
.ctaband__actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px;justify-content:center;}

/* ---------- footer ---------- */
.footer{background:var(--blue-night);color:#9DABBB;padding-top:70px;}
.footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1.15fr 1.25fr;gap:52px;padding-bottom:56px;}
.footer__brand{display:flex;align-items:center;gap:12px;margin-bottom:22px;}
.footer__brand .logo__name{color:#fff;}
.footer__brand .logo__sub{color:#7A8896;}
.footer__about{font-size:12.8px;line-height:1.85;color:#8B99A9;max-width:330px;}
.footer__tagline{
  margin-top:20px;padding-top:18px;border-top:1px solid rgba(255,255,255,.10);
  font-size:12.6px;line-height:1.7;color:#C7D2DE;
}
.footer h4{
  font-size:11.4px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:#fff;margin-bottom:20px;
}
.footer li{padding:6px 0;}
.footer li a{font-size:13px;color:#94A2B2;transition:.2s;}
.footer li a:hover{color:#fff;}
.footer__contact li{display:flex;gap:11px;font-size:12.7px;line-height:1.7;color:#A2B0C0;padding:8px 0;}
.footer__contact svg{flex:0 0 auto;color:var(--orange);margin-top:3px;}
.footer__contact b{color:#fff;font-weight:600;}
.footer__bottom{
  border-top:1px solid rgba(255,255,255,.10);padding:22px 0 26px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-size:11.6px;color:#74818F;letter-spacing:.01em;
}
.footer__bottom a{color:#94A2B2;}
.footer__bottom a:hover{color:#fff;}
.footer__lang{display:none;gap:14px;font-size:11.4px;letter-spacing:.08em;}
.footer__lang a:hover{color:#fff;}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.22,.61,.36,1);}
.reveal.in{opacity:1;transform:none;}
.reveal[data-d="1"]{transition-delay:.08s;}
.reveal[data-d="2"]{transition-delay:.16s;}
.reveal[data-d="3"]{transition-delay:.24s;}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
  .step.is-active .step__bar i{animation:none;width:100%;}
}

/* ============================================================
   responsive
   ============================================================ */
@media (max-width:1399px){
  /* 窄屏时轮播左右箭头会压到标语上，改由底部 01/02/03 步骤条切换 */
  .slider__nav{display:none;}
}

@media (max-width:1180px){
  .nav{gap:20px;}
  .nav__menu > li > a{padding:10px 9px;font-size:13.2px;}
  .adv{grid-template-columns:repeat(2,1fr);}
  .about{gap:44px;}
  .faq{gap:40px;}
  .inq{gap:36px;}
}

@media (max-width:991px){
  .container{padding:0 22px;}
  .section{padding:70px 0;}
  .section--tight{padding:60px 0;}
  .topbar__left{gap:14px;}
  .topbar__item--hide{display:none;}
  .nav{height:68px;gap:14px;}
  .nav__toggle{display:block;margin-left:auto;order:2;}
  .nav__cta{order:3;height:42px;padding:0 16px;font-size:11.5px;}
  .nav__logo{order:1;}
  .nav__menu{
    position:fixed;left:0;right:0;top:68px;bottom:auto;flex-direction:column;align-items:stretch;
    background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow-md);
    padding:10px 0 16px;gap:0;max-height:calc(100vh - 68px);overflow:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);transition:.25s;order:4;margin-left:0;
  }
  .nav__menu.is-open{opacity:1;visibility:visible;transform:none;}
  .nav__menu > li > a{display:block;padding:13px 22px;font-size:14.5px;width:100%;}
  .nav__dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;
    min-width:0;padding:0 0 8px;display:none;}
  .has-drop.is-open .nav__dropdown{display:block;}
  .nav__dropdown a{padding:9px 34px;}
  .slider{height:600px;}
  .slider__nav{padding:0 10px;}
  .slide__content{max-width:100%;padding-right:56px;}
  .slide h1{font-size:34px;}
  .slider__bottom{padding-bottom:18px;}
  .slider__scroll{display:none;}
  .slider__steps{max-width:none;}
  .trust{padding:22px 0 26px;}
  .trust__row{grid-template-columns:repeat(2,1fr);gap:12px;}
  .trust__item{padding:16px 16px;}
  .cat{grid-template-columns:repeat(2,1fr);}
  .ind{grid-template-columns:repeat(2,1fr);}
  .hot{grid-template-columns:repeat(2,1fr);}
  .about{grid-template-columns:1fr;gap:40px;}
  .faq{grid-template-columns:1fr;gap:36px;}
  .faq__aside{position:static;}
  .inq{grid-template-columns:1fr;gap:32px;}
  .inq__side{position:static;}
  .footer__grid{grid-template-columns:1fr 1fr;gap:36px;}
  .section__head{flex-direction:column;align-items:flex-start;gap:20px;}
  .std__wrap table{font-size:12.4px;}
  .std__wrap thead th,.std__wrap tbody td{padding:11px 12px;}
}

@media (max-width:640px){
  .container{padding:0 18px;}
  .section{padding:56px 0;}
  .topbar{display:none;}
  .nav{height:62px;}
  .nav__menu{top:62px;max-height:calc(100vh - 62px);}
  .logo__name{font-size:16px;letter-spacing:.09em;}
  .logo__sub{font-size:8.5px;letter-spacing:.18em;}
  .logo__img{height:32px;}
  .nav__cta{display:none;}
  .slider{height:560px;}
  .slider__btn{display:none;}
  .slide h1{font-size:27px;margin-bottom:16px;}
  .slide p{font-size:13.6px;line-height:1.7;}
  .slide__content{padding-right:0;}
  .slide__actions .btn{height:46px;padding:0 18px;font-size:11.5px;flex:1 1 auto;}
  .step__nm{display:none;}
  .section h2{font-size:23px;}
  .section__desc{font-size:13.6px;}
  .adv{grid-template-columns:1fr;}
  .cat{grid-template-columns:1fr;}
  .ind{grid-template-columns:1fr;}
  .hot{grid-template-columns:repeat(2,1fr);gap:14px;}
  .hot__body{padding:14px 13px 16px;}
  .hot__name{font-size:13.2px;}
  .about__facts{grid-template-columns:1fr;}
  .form__grid{grid-template-columns:1fr;}
  .inq__form{padding:26px 20px 24px;}
  .contactcard{padding:28px 22px;}
  .footer__grid{grid-template-columns:1fr;gap:30px;}
  .unwrap{overflow-x:auto;}
  .std__wrap table{min-width:620px;}
  .std__wrap{overflow-x:auto;}
  .ctaband .container{padding-top:52px;padding-bottom:52px;}
  .ctaband h2{white-space:normal;}
}