/* ==========================================================
   0. RESET / BASE
   ========================================================== */
:root{
  --red:#C90012;
  --red-dark:#9c000e;
  --black:#111111;
  --dark:#181818;
  --dark-2:#212121;
  --gray:#F4F4F4;
  --gray-2:#8a8a8a;
  --border:#DDDDDD;
  --white:#FFFFFF;
  --font-jp:'Zen Kaku Gothic New','Noto Sans JP',sans-serif;
  --font-en:'Inter',sans-serif;
  --max-w:1240px;
  --pad:clamp(20px,4vw,60px);
  --ease:cubic-bezier(.4,0,.2,1);
  --dur:380ms;
  --header-h:84px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}
body{
  font-family:var(--font-jp);
  color:var(--black);
  background:var(--white);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%;}
img{height:auto;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;}
button{font:inherit;background:none;border:none;cursor:pointer;color:inherit;}
:focus-visible{outline:2px solid var(--red);outline-offset:3px;}
.container{max-width:var(--max-w);margin:0 auto;padding-inline:var(--pad);}
.en{font-family:var(--font-en);}

/* section heading pattern */
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:44px;}
.sec-head__text{max-width:560px;}
.sec-head__title{font-size:clamp(24px,3vw,32px);font-weight:700;letter-spacing:.02em;display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;}
.sec-head__title .en{font-size:13px;font-weight:600;letter-spacing:.14em;color:var(--red);}
.sec-head__lead{margin-top:14px;font-size:14.5px;color:#4a4a4a;line-height:1.9;}
.sec-head.on-dark .sec-head__lead{color:#b9b9b9;}
.sec-head.on-dark .sec-head__title{color:var(--white);}
.sec-head__title.on-dark{color:var(--white);margin-bottom:22px;}

.btn-line{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 26px;border:1.5px solid var(--red);color:var(--red);
  font-size:13.5px;font-weight:600;letter-spacing:.04em;white-space:nowrap;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn-line svg{width:15px;height:15px;transition:transform var(--dur) var(--ease);}
.btn-line:hover{background:var(--red);color:var(--white);}
.btn-line:hover svg{transform:translateX(4px);}

.btn-solid{
  display:inline-flex;align-items:center;gap:10px;
  padding:16px 30px;background:var(--red);color:var(--white);
  font-size:14px;font-weight:700;letter-spacing:.04em;white-space:nowrap;
  transition:background var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn-solid svg{width:15px;height:15px;transition:transform var(--dur) var(--ease);}
.btn-solid:hover{background:var(--red-dark);}
.btn-solid:hover svg{transform:translateX(4px);}

.btn-outline-light{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 26px;border:1.5px solid rgba(255,255,255,.55);color:var(--white);
  font-size:13.5px;font-weight:600;letter-spacing:.04em;white-space:nowrap;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn-outline-light svg{width:15px;height:15px;transition:transform var(--dur) var(--ease);}
.btn-outline-light:hover{background:var(--white);color:var(--black);border-color:var(--white);}
.btn-outline-light:hover svg{transform:translateX(4px);}

/* reveal-on-scroll */
.reveal{opacity:0;transform:translateY(22px);transition:opacity 700ms var(--ease),transform 700ms var(--ease);}
.reveal.is-visible{opacity:1;transform:translateY(0);}
.reveal-stagger > *{transition-delay:calc(var(--i,0) * 90ms);}

/* ==========================================================
   1. HEADER
   ========================================================== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:200;
  height:var(--header-h);
  display:flex;align-items:center;
  background:rgba(255,255,255,.97);
  border-bottom:1px solid transparent;
  transition:height var(--dur) var(--ease),box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-header.scrolled{height:64px;box-shadow:0 6px 24px rgba(0,0,0,.07);border-color:var(--border);}
.site-header__inner{
  width:100%;max-width:1440px;margin:0 auto;
  padding-inline:clamp(20px,3vw,44px);
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand__mark{width:38px;height:38px;flex:none;}
.brand__word{display:flex;flex-direction:column;line-height:1.25;}
.brand__ja{font-size:16.5px;font-weight:700;letter-spacing:.02em;}
.brand__en{font-family:var(--font-en);font-size:9.5px;letter-spacing:.14em;color:var(--gray-2);}

.gnav{display:flex;align-items:center;gap:clamp(18px,2.2vw,36px);}
.gnav a{
  position:relative;font-size:14px;font-weight:500;padding:6px 0;
}
.gnav a::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:var(--red);
  transform:scaleX(0);transform-origin:right;transition:transform var(--dur) var(--ease);
}
.gnav a:hover::after,.gnav a:focus-visible::after{transform:scaleX(1);transform-origin:left;}

.header-cta{
  display:flex;align-items:center;gap:8px;
  background:var(--red);color:var(--white);
  padding:0 24px;height:100%;
  font-size:13.5px;font-weight:700;letter-spacing:.03em;
  transition:background var(--dur) var(--ease);
}
.header-cta svg{width:16px;height:16px;}
.header-cta:hover{background:var(--red-dark);}
.header-actions{display:flex;align-items:stretch;height:100%;gap:18px;}

.hamburger{
  display:none;flex-direction:column;justify-content:center;align-items:center;
  width:44px;height:44px;gap:6px;flex:none;
}
.hamburger span{display:block;width:22px;height:2px;background:var(--black);transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);}
.hamburger[aria-expanded="true"] span:nth-child(1){transform:translateY(8px) rotate(45deg);}
.hamburger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.hamburger[aria-expanded="true"] span:nth-child(3){transform:translateY(-8px) rotate(-45deg);}

.mobile-nav{
  position:fixed;inset:var(--header-h) 0 0 0;z-index:190;
  background:var(--white);
  transform:translateX(100%);transition:transform var(--dur) var(--ease);
  overflow-y:auto;
}
.mobile-nav.open{transform:translateX(0);}
.mobile-nav__list{padding:8px clamp(20px,6vw,40px) 40px;}
.mobile-nav__list li{border-bottom:1px solid var(--border);}
.mobile-nav__list a{display:flex;align-items:center;justify-content:space-between;padding:19px 2px;font-size:16px;font-weight:500;}
.mobile-nav__list a svg{width:13px;height:13px;opacity:.55;}
.mobile-nav__contact{margin-top:28px;padding-top:28px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:14px;}
.mobile-nav__contact a{display:flex;align-items:center;gap:10px;font-size:14.5px;font-weight:600;}
.mobile-nav__contact svg{width:18px;height:18px;color:var(--red);}

/* ==========================================================
   2. HERO
   ========================================================== */
.hero{
  position:relative;
  margin-top:var(--header-h);
  min-height:640px;
  display:flex;align-items:center;
  overflow:hidden;
  background:var(--black);
}
.hero__bg{position:absolute;inset:0;z-index:0;}
.hero__bg img{width:100%;height:100%;object-fit:cover;object-position:60% 45%;}
.hero__scrim{
  position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(90deg,rgba(8,8,8,.94) 0%,rgba(8,8,8,.82) 32%,rgba(8,8,8,.35) 62%,rgba(8,8,8,.15) 100%),
    linear-gradient(100deg,transparent 62%,rgba(201,0,18,.55) 100%);
}
.hero__inner{
  position:relative;z-index:2;width:100%;max-width:1440px;margin:0 auto;
  padding:96px clamp(20px,3vw,44px) 70px;
  display:grid;grid-template-columns:1fr;gap:40px;
}
.hero__eyebrow{
  display:flex;align-items:center;gap:10px;color:var(--red);
  font-size:12.5px;font-weight:700;letter-spacing:.16em;margin-bottom:22px;
}
.hero__eyebrow::before{content:"";width:26px;height:2px;background:var(--red);}
.hero h1{
  color:var(--white);font-weight:900;letter-spacing:.01em;
  font-size:clamp(34px,5.1vw,58px);line-height:1.32;
  text-shadow:0 2px 18px rgba(0,0,0,.35);
}
.hero__rule{width:60px;height:3px;background:var(--red);margin:26px 0;}
.hero__lead{color:#dcdcdc;font-size:15px;line-height:2;max-width:480px;}
.hero__actions{margin-top:38px;display:flex;flex-wrap:wrap;gap:16px;align-items:center;}

.hero__badges{
  display:flex;gap:16px;flex-wrap:wrap;margin-top:56px;
}
.badge-ring{
  width:96px;height:96px;border-radius:50%;
  border:1.5px solid rgba(255,255,255,.4);
  background:rgba(10,10,10,.28);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  color:var(--white);transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.badge-ring svg{width:22px;height:22px;color:var(--red);}
.badge-ring b{font-size:13px;font-weight:700;letter-spacing:.02em;}
.badge-ring span{font-family:var(--font-en);font-size:8.5px;letter-spacing:.12em;color:#c8c8c8;}
.badge-ring:hover{border-color:var(--red);background:rgba(201,0,18,.18);}

.hero__sidelabel{
  position:absolute;left:14px;top:50%;transform:translateY(-50%) rotate(180deg);
  writing-mode:vertical-rl;font-family:var(--font-en);font-size:10px;letter-spacing:.25em;
  color:rgba(255,255,255,.4);display:none;z-index:2;
}

/* ==========================================================
   3. BUSINESS (事業案内)
   ========================================================== */
.section{padding:100px 0;}
.section--tight{padding:88px 0;}
.business-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;}
.biz-card{border:1px solid var(--border);transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);}
.biz-card:hover{transform:translateY(-6px);box-shadow:0 18px 32px rgba(0,0,0,.09);}
.biz-card__img{aspect-ratio:4/3;position:relative;overflow:hidden;background:var(--dark);}
.biz-card__num{
  position:absolute;left:16px;bottom:-20px;z-index:2;
  width:40px;height:40px;border-radius:50%;background:var(--red);color:var(--white);
  display:flex;align-items:center;justify-content:center;font-family:var(--font-en);font-weight:700;font-size:13px;
  box-shadow:0 6px 14px rgba(201,0,18,.35);
}
.biz-card__img img{width:100%;height:100%;object-fit:cover;transition:transform 600ms var(--ease);}
.biz-card:hover .biz-card__img img{transform:scale(1.045);}
.biz-card__body{padding:32px 22px 26px;}
.biz-card__body h3{font-size:16.5px;font-weight:700;margin-bottom:10px;}
.biz-card__body p{font-size:13px;color:#666;line-height:1.85;}

/* ==========================================================
   4. PRODUCTS (製品・技術) — dark band
   ========================================================== */
.section--dark{background:var(--black);color:var(--white);}
.products-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;align-items:center;}
.products-copy h2{font-size:clamp(24px,2.9vw,34px);font-weight:800;line-height:1.5;margin:8px 0 22px;}
.products-copy p{font-size:14px;color:#b7b7b7;line-height:2;margin-bottom:22px;}
.tag-list{display:flex;flex-direction:column;gap:10px;margin-bottom:34px;}
.tag-list li{
  font-size:12.5px;color:#d8d8d8;padding-left:18px;position:relative;line-height:1.7;
}
.tag-list li::before{
  content:"";position:absolute;left:0;top:9px;width:8px;height:1.5px;background:var(--red);
}
.products-photo{border:1px solid #2b2b2b;overflow:hidden;}
.products-photo img{width:100%;height:100%;object-fit:cover;transition:transform 600ms var(--ease);}
.products-photo:hover img{transform:scale(1.03);}

/* ==========================================================
   5. STRENGTH
   ========================================================== */
.strength-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:var(--border);border:1px solid var(--border);}
.strength-item{background:var(--white);padding:44px 28px;text-align:center;transition:background var(--dur) var(--ease);}
.strength-item:hover{background:var(--gray);}
.strength-item__icon{
  width:64px;height:64px;margin:0 auto 22px;border-radius:50%;
  border:1.5px solid #f0d3d6;display:flex;align-items:center;justify-content:center;
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.strength-item:hover .strength-item__icon{border-color:var(--red);transform:scale(1.06);}
.strength-item__icon svg{width:28px;height:28px;color:var(--red);}
.strength-item h3{font-size:15.5px;font-weight:700;margin-bottom:12px;}
.strength-item p{font-size:12.5px;color:#666;line-height:1.85;}

/* ==========================================================
   6. EQUIPMENT — dark band
   ========================================================== */
.equip-photo{border:1px solid #2b2b2b;overflow:hidden;margin-bottom:26px;}
.equip-photo img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/7.3;transition:transform 600ms var(--ease);}
.equip-photo:hover img{transform:scale(1.02);}
.equip-more{display:flex;flex-wrap:wrap;gap:10px 12px;margin-top:8px;}
.equip-more span{
  font-size:12px;color:#c9c9c9;border:1px solid #333;padding:8px 16px;border-radius:999px;
}
.equip-foot{margin-top:40px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px;}

/* ==========================================================
   7. COMPANY
   ========================================================== */
.company-layout{display:grid;grid-template-columns:1fr 1.15fr 1fr;}
.company-photo,.company-photo2{aspect-ratio:3/4;overflow:hidden;}
.company-photo img,.company-photo2 img{width:100%;height:100%;object-fit:cover;}
.company-info{background:var(--gray);padding:56px 44px;display:flex;flex-direction:column;justify-content:center;}
.company-info h2{font-size:clamp(22px,2.6vw,28px);font-weight:800;margin-bottom:10px;}
.company-info .en{display:block;font-size:11px;letter-spacing:.14em;color:var(--red);font-weight:700;margin-bottom:18px;}
.company-info__lead{font-size:13.5px;color:#555;line-height:1.9;margin-bottom:30px;}
.company-table{border-top:1px solid var(--border);margin-bottom:32px;}
.company-table div{display:grid;grid-template-columns:96px 1fr;gap:12px;padding:13px 0;border-bottom:1px solid var(--border);font-size:13px;}
.company-table dt{color:#888;font-weight:500;}
.company-table dd{color:#222;}

/* ==========================================================
   8. NEWS
   ========================================================== */
.news-list{border-top:1px solid var(--border);}
.news-item{
  display:grid;grid-template-columns:120px 96px 1fr 16px;align-items:center;gap:22px;
  padding:22px 4px;border-bottom:1px solid var(--border);transition:opacity var(--dur) var(--ease);
}
.news-item:hover{opacity:.6;}
.news-item time{font-family:var(--font-en);font-size:12.5px;color:#888;}
.news-item .cat{
  font-size:11px;font-weight:600;text-align:center;padding:6px 4px;border:1px solid var(--border);color:#555;
}
.news-item .cat--info{border-color:var(--red);color:var(--red);}
.news-item p{font-size:14px;}
.news-item svg{width:12px;height:12px;color:#aaa;}
.news-foot{margin-top:34px;text-align:right;}
.news-note{margin-top:18px;font-size:11.5px;color:#aaa;}

/* ==========================================================
   9. CTA banner
   ========================================================== */
.cta-banner{position:relative;color:var(--white);overflow:hidden;}
.cta-banner__bg{position:absolute;inset:0;z-index:0;}
.cta-banner__bg img{width:100%;height:100%;object-fit:cover;}
.cta-banner::before{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(100deg,rgba(6,0,1,.88) 0%,rgba(120,0,10,.82) 55%,rgba(201,0,18,.55) 100%);
}
.cta-banner__inner{
  position:relative;z-index:2;
  padding:56px var(--pad);display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;
}
.cta-banner__left{display:flex;align-items:center;gap:22px;}
.cta-banner__icon{
  width:58px;height:58px;border-radius:50%;border:1.5px solid rgba(255,255,255,.5);
  display:flex;align-items:center;justify-content:center;flex:none;
}
.cta-banner__icon svg{width:24px;height:24px;}
.cta-banner h2{font-size:clamp(19px,2.2vw,25px);font-weight:800;margin-bottom:8px;}
.cta-banner p{font-size:13px;color:rgba(255,255,255,.85);}
.cta-btn{
  display:inline-flex;align-items:center;gap:10px;background:var(--white);color:var(--red);
  padding:17px 34px;font-weight:700;font-size:14px;letter-spacing:.02em;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.cta-btn svg{width:15px;height:15px;transition:transform var(--dur) var(--ease);}
.cta-btn:hover{transform:translateY(-3px);}
.cta-btn:hover svg{transform:translateX(4px);}

/* ==========================================================
   10. FOOTER
   ========================================================== */
.site-footer{background:var(--black);color:#ababab;padding-top:76px;}
.footer-top{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:40px;padding-bottom:56px;border-bottom:1px solid #2a2a2a;}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:18px;}
.footer-brand .brand__mark{width:34px;height:34px;}
.footer-brand__ja{color:var(--white);font-weight:700;font-size:15.5px;}
.footer-brand__en{font-family:var(--font-en);font-size:9px;letter-spacing:.14em;color:#777;}
.footer-addr{font-size:12.5px;line-height:2;color:#8f8f8f;}
.footer-addr a{color:#c9c9c9;}
.footer-col h4{color:var(--white);font-size:12.5px;font-weight:700;letter-spacing:.06em;margin-bottom:20px;}
.footer-col ul{display:flex;flex-direction:column;gap:13px;}
.footer-col a{font-size:12.5px;color:#9a9a9a;transition:color var(--dur) var(--ease);}
.footer-col a:hover{color:var(--white);}
.footer-bottom{
  padding:26px var(--pad) 26px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  max-width:var(--max-w);margin:0 auto;
}
.footer-bottom small{font-size:11px;color:#666;}
.back-to-top{
  width:42px;height:42px;border:1px solid #333;display:flex;align-items:center;justify-content:center;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.back-to-top svg{width:14px;height:14px;transform:rotate(-90deg);color:#ccc;}
.back-to-top:hover{background:var(--red);border-color:var(--red);}

/* ==========================================================
   RESPONSIVE
   ========================================================== */
@media (max-width:1180px){
  .business-grid{grid-template-columns:repeat(2,1fr);}
  .strength-grid{grid-template-columns:repeat(2,1fr);}
  .company-layout{grid-template-columns:1fr;}
  .company-photo,.company-photo2{aspect-ratio:16/9;}
  .footer-top{grid-template-columns:1fr 1fr;row-gap:44px;}
}
@media (max-width:1024px){
  .gnav{display:none;}
  .hamburger{display:flex;}
  .products-layout{grid-template-columns:1fr;}
  .products-photo{order:-1;aspect-ratio:16/10;}
  .hero__bg img{object-position:70% 50%;}
}
@media (max-width:760px){
  :root{--header-h:66px;}
  .header-cta span{display:none;}
  .header-cta{padding:0 16px;}
  .hero{min-height:auto;}
  .hero__inner{padding:52px 20px 54px;}
  .hero__badges{gap:12px;}
  .badge-ring{width:80px;height:80px;}
  .section{padding:70px 0;}
  .section--tight{padding:60px 0;}
  .business-grid{grid-template-columns:1fr 1fr;gap:14px;}
  .biz-card__body{padding:20px 14px 18px;}
  .biz-card__body h3{font-size:14.5px;}
  .sec-head{margin-bottom:32px;}
  .strength-grid{grid-template-columns:1fr 1fr;}
  .strength-item{padding:32px 16px;}
  .equip-photo img{aspect-ratio:4/3;}
  .company-info{padding:40px 24px;}
  .news-item{grid-template-columns:1fr;gap:6px;padding:18px 2px;}
  .news-item .cat{justify-self:start;}
  .cta-banner__inner{flex-direction:column;align-items:flex-start;}
  .cta-btn{width:100%;justify-content:center;}
  .footer-top{grid-template-columns:1fr;gap:36px;padding-bottom:40px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}
@media (max-width:430px){
  .business-grid{grid-template-columns:1fr 1fr;}
}