:root{
  --ink:#1a1a1a;
  --gray:#6f6f6f;
  --gray-lt:#9b9b98;
  --hair:#e6e6e3;
  --bg:#ffffff;
  --bg-soft:#f7f7f5;
  --max:1080px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Hiragino Sans","Yu Gothic","Noto Sans JP","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.9;font-size:15px;
  font-feature-settings:"palt";
}
img{max-width:100%;display:block}
a{color:var(--ink);text-decoration:none;transition:opacity .2s}
a:hover{opacity:.6}
.wrap{max-width:var(--max);margin:0 auto;padding:0 28px}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--hair)}
.top .wrap{display:flex;align-items:center;gap:28px;height:72px}
.logo{font-weight:600;font-size:15px;letter-spacing:.14em;color:var(--ink)}
.logo small{display:block;font-size:10px;font-weight:400;color:var(--gray-lt);letter-spacing:.22em}
nav{margin-left:auto;display:flex;gap:30px;font-size:13px;letter-spacing:.08em}
nav a{color:var(--ink);padding:6px 0}
.lang{margin-left:8px;font-size:12px;letter-spacing:.1em;border:1px solid var(--ink);padding:7px 18px;color:var(--ink);white-space:nowrap}
.lang:hover{background:var(--ink);color:#fff;opacity:1}

/* ---------- hero ---------- */
.hero{background:var(--bg-soft);border-bottom:1px solid var(--hair)}
.hero .wrap{padding:110px 28px 100px}
.hero .eyebrow{font-size:11px;letter-spacing:.42em;color:var(--gray-lt);margin-bottom:30px;text-transform:uppercase}
.hero h1{font-size:clamp(26px,4vw,40px);line-height:1.6;font-weight:500;letter-spacing:.08em;max-width:24em}
.hero p.lede{margin-top:30px;max-width:40em;font-size:14px;color:var(--gray);line-height:2.1}
.hero .cta-row{margin-top:44px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:15px 44px;font-size:13px;letter-spacing:.18em;border:1px solid var(--ink);transition:all .25s}
.btn-solid{background:var(--ink);color:#fff}
.btn-solid:hover{background:#fff;color:var(--ink);opacity:1}
.btn-ghost{color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff;opacity:1}
.hero .facts{margin-top:70px;display:flex;flex-wrap:wrap;border-top:1px solid var(--hair)}
.hero .facts div{padding:22px 44px 0 0;margin-right:44px;font-size:11.5px;color:var(--gray-lt);letter-spacing:.1em}
.hero .facts strong{display:block;font-size:15px;color:var(--ink);font-weight:600;letter-spacing:.12em;margin-bottom:2px}

/* ---------- hairline divider ---------- */
.stitch{height:0;border-top:1px solid var(--hair);max-width:var(--max);margin:0 auto}
.stitch::before{content:none}

/* ---------- sections ---------- */
section{padding:96px 0}
.sec-head{margin-bottom:56px}
.sec-head .eyebrow{font-size:11px;letter-spacing:.38em;color:var(--gray-lt);font-weight:400;text-transform:uppercase}
.sec-head h2{font-size:clamp(20px,2.6vw,26px);color:var(--ink);margin-top:14px;font-weight:500;letter-spacing:.14em}
.sec-head p{color:var(--gray);margin-top:16px;max-width:46em;font-size:13.5px}

/* ---------- product grid ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:48px 36px}
.card{background:transparent;border:none;border-radius:0;overflow:visible;display:flex;flex-direction:column;transition:none}
.card:hover{box-shadow:none;transform:none}
.card:hover .ph{opacity:.85}
.card .ph{aspect-ratio:4/3;background:var(--bg-soft);border:1px solid var(--hair);border-bottom:1px solid var(--hair);transition:opacity .3s}
.card .body{padding:20px 2px 0;display:flex;flex-direction:column;flex:1}
.card h3{font-size:15.5px;color:var(--ink);font-weight:600;letter-spacing:.1em}
.card h3 small{display:block;font-size:10.5px;color:var(--gray-lt);font-weight:400;letter-spacing:.16em;margin-top:4px}
.card p{font-size:13px;color:var(--gray);margin-top:12px;flex:1;line-height:1.95}
.tags{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px}
.tags span{font-size:11px;letter-spacing:.06em;background:transparent;border:1px solid var(--hair);border-radius:0;padding:3px 12px;color:var(--gray)}

/* ---------- OEM steps ---------- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:0;background:transparent;border:none;border-radius:0;overflow:visible}
.steps div{background:transparent;padding:4px 32px 4px 0;border-left:1px solid var(--hair);padding-left:24px}
.steps div:first-child{border-left:none;padding-left:0}
.steps b{display:block;color:var(--gray-lt);font-size:10.5px;letter-spacing:.32em;margin-bottom:12px;font-weight:400}
.steps h4{font-size:14.5px;color:var(--ink);margin-bottom:8px;font-weight:600;letter-spacing:.08em}
.steps p{font-size:12.5px;color:var(--gray);line-height:1.9}

/* ---------- production / fact cols ---------- */
.fact-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:0}
.fact-cols article{background:transparent;border:none;border-top:1px solid var(--hair);border-radius:0;padding:24px 32px 0 0}
.fact-cols h4{color:var(--ink);font-size:14px;margin-bottom:8px;font-weight:600;letter-spacing:.1em}
.fact-cols p{font-size:12.5px;color:var(--gray)}

.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:28px}
.gallery figure{background:transparent;border:none;border-radius:0;overflow:visible}
.gallery img{aspect-ratio:4/3;object-fit:cover;width:100%;border:1px solid var(--hair)}
.gallery figcaption{padding:14px 2px 0;font-size:12px;color:var(--gray);line-height:1.8}
.gallery figcaption b{color:var(--ink);display:block;font-size:13px;font-weight:600;letter-spacing:.08em;margin-bottom:2px}
.video-box{margin-top:44px;background:transparent;border:none;border-radius:0;overflow:visible}
.video-box video{width:100%;display:block;aspect-ratio:16/9;background:var(--bg-soft);border:1px solid var(--hair)}
.video-box .cap{padding:14px 2px 0;font-size:12px;color:var(--gray);border-top:none}

/* ---------- certifications ---------- */
.certs{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:28px}
.certs figure{background:transparent;border:none;border-radius:0;padding:0;text-align:left;transition:none}
.certs figure:hover{box-shadow:none}
.certs figure:hover img{opacity:.85}
.certs img{aspect-ratio:3/4;object-fit:cover;width:100%;border:1px solid var(--hair);border-radius:0;transition:opacity .3s}
.certs figcaption{margin-top:12px;font-size:12px;color:var(--ink);font-weight:600;letter-spacing:.06em}
.certs figcaption small{display:block;font-weight:400;color:var(--gray-lt);font-size:11px;margin-top:3px}
.cert-note{margin-top:36px;font-size:12px;color:var(--gray-lt);background:transparent;border:none;border-top:1px solid var(--hair);border-radius:0;padding:16px 0 0}

/* ---------- FAQ ---------- */
.faq details{background:transparent;border:none;border-top:1px solid var(--hair);border-radius:0;margin-bottom:0;padding:0}
.faq details:last-child{border-bottom:1px solid var(--hair)}
.faq summary{cursor:pointer;font-weight:500;color:var(--ink);padding:22px 32px 22px 0;list-style:none;position:relative;font-size:14px;letter-spacing:.05em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"＋";position:absolute;right:2px;color:var(--gray-lt);font-weight:300}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 0 24px;font-size:13px;color:var(--gray);max-width:52em}

/* ---------- contact ---------- */
.contact{background:var(--bg-soft);color:var(--ink);border-top:1px solid var(--hair)}
.contact .sec-head h2{color:var(--ink)}
.contact .sec-head .eyebrow{color:var(--gray-lt)}
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:64px}
.contact dl{font-size:14px}
.contact dt{color:var(--gray-lt);font-size:11px;letter-spacing:.24em;margin-top:22px}
.contact dd{margin-top:4px;letter-spacing:.03em}
.contact a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--gray-lt);text-underline-offset:4px}
.contact .note{background:#fff;border:1px solid var(--hair);border-radius:0;padding:32px;font-size:13px}
.contact .note h4{color:var(--ink);margin-bottom:10px;font-size:13.5px;font-weight:600;letter-spacing:.06em}
.contact .note p{color:var(--gray);font-size:12.5px}
.contact .btn-solid{margin-top:22px}

/* ---------- footer ---------- */
footer{background:#fff;color:var(--gray-lt);font-size:11.5px;border-top:1px solid var(--hair);letter-spacing:.08em}
footer .wrap{padding:34px 28px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{color:var(--gray)}

@media(max-width:760px){
  nav{display:none}
  .contact-grid{grid-template-columns:1fr}
  .hero .wrap{padding:72px 28px 64px}
  .hero .facts div{margin-right:24px;padding-right:24px}
  section{padding:64px 0}
  .steps div{border-left:none;padding-left:0;border-top:1px solid var(--hair);padding-top:18px;margin-top:18px}
  .steps div:first-child{border-top:none;margin-top:0;padding-top:0}
}