:root {
  --ink: #0a1720;
  --navy: #102c3c;
  --blue: #1d536b;
  --heat: #ef6c35;
  --heat-light: #ffb067;
  --paper: #f5f2eb;
  --white: #fff;
  --muted: #63727a;
  --line: #d8dedf;
  --radius: 22px;
  --shadow: 0 24px 70px rgba(5, 26, 37, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 1.8; }
a { color: inherit; }
.shell { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 100; top: 12px; left: 12px; padding: 10px 16px; background: var(--white); border-radius: 8px; transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.site-header { position: absolute; z-index: 20; inset: 0 0 auto; color: var(--white); }
.site-header.solid { position: relative; background: var(--navy); }
.header-inner { min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; }
.brand-logo { position: relative; overflow: hidden; flex: 0 0 auto; width: 74px; height: 63px; }
.brand-logo img { position: absolute; left: -73px; top: -125px; width: 219px; max-width: none; height: auto; }
.brand-name small { display: block; opacity: .8; font-size: .68rem; letter-spacing: .14em; white-space: nowrap; }
nav { display: flex; gap: 34px; }
nav a { position: relative; padding: 10px 0; text-decoration: none; font-weight: 700; font-size: .88rem; letter-spacing: .08em; }
nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 2px; height: 2px; background: var(--heat-light); transition: right .25s ease; }
nav a:hover::after, nav a:focus-visible::after, nav a[aria-current]::after { right: 0; }
.header-actions { display: flex; align-items: center; gap: 28px; }
.main-nav { gap: 30px; }
.language-menu { position: relative; flex: 0 0 auto; }
.language-menu summary { min-height: 44px; display: flex; align-items: center; gap: 8px; padding: 0 12px; border: 1px solid rgba(255,255,255,.24); border-radius: 999px; cursor: pointer; list-style: none; font-size: .73rem; font-weight: 700; letter-spacing: .06em; user-select: none; }
.language-menu summary::-webkit-details-marker { display: none; }
.language-menu summary::after { content: "▾"; color: var(--heat-light); font-size: .7rem; transition: transform .2s ease; }
.language-menu[open] summary::after { transform: rotate(180deg); }
.language-code { min-width: 24px; padding: 1px 5px; border-radius: 999px; color: var(--navy); background: var(--heat-light); text-align: center; font: 700 .62rem/1.5 Arial, sans-serif; letter-spacing: 0; }
.language-options { position: absolute; z-index: 50; top: calc(100% + 9px); right: 0; width: 190px; max-width: calc(100vw - 32px); padding: 8px; border: 1px solid rgba(255,255,255,.12); border-radius: 14px; color: var(--white); background: #0a202b; box-shadow: 0 18px 45px rgba(0,0,0,.3); }
.language-options a { min-height: 44px; display: flex; align-items: center; padding: 8px 12px; border-radius: 9px; text-decoration: none; font-size: .82rem; font-weight: 700; }
.language-options a:hover, .language-options a:focus-visible { background: rgba(255,255,255,.1); }
.language-options a[aria-current="page"] { color: var(--heat-light); background: rgba(239,108,53,.13); }

.hero { position: relative; overflow: hidden; min-height: 760px; color: var(--white); background: radial-gradient(circle at 76% 45%, rgba(239,108,53,.22), transparent 25%), linear-gradient(135deg, #071720 0%, #113446 58%, #17485a 100%); }
.hero::before { content: ""; position: absolute; inset: 0; opacity: .16; background-image: linear-gradient(rgba(255,255,255,.22) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.22) 1px, transparent 1px); background-size: 74px 74px; mask-image: linear-gradient(to right, transparent 4%, #000 45%, #000); }
.hero-grid { position: relative; min-height: 760px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 70px; padding-top: 90px; }
.eyebrow, .section-index { margin: 0 0 24px; font: 700 .73rem/1.4 Arial, sans-serif; letter-spacing: .22em; text-transform: uppercase; color: var(--heat); }
.eyebrow { display: flex; align-items: center; gap: 12px; color: #ffd0ae; }
.eyebrow span { width: 42px; height: 1px; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { margin-bottom: 28px; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(3rem, 6.4vw, 6rem); font-weight: 600; line-height: 1.18; letter-spacing: .02em; overflow-wrap: anywhere; }
.hero h1 em { color: var(--heat-light); font-style: normal; }
.hero h1.hero-title-ja { font-size: clamp(3.2rem, 5.4vw, 5rem); line-height: 1.22; letter-spacing: 0; }
.hero h1.hero-title-en { font-size: clamp(2.7rem, 4.6vw, 4rem); line-height: 1.18; letter-spacing: 0; }
.hero h1.hero-title-zh { font-size: clamp(3rem, 5vw, 4.5rem); line-height: 1.22; letter-spacing: 0; }
.hero-line { display: block; white-space: nowrap; overflow-wrap: normal; }
.lead { max-width: 650px; color: #dbe6e9; font-size: 1.08rem; line-height: 2; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }
.button { display: inline-flex; min-height: 54px; align-items: center; justify-content: center; padding: 0 27px; border: 1px solid transparent; border-radius: 999px; text-decoration: none; font-weight: 700; font-size: .9rem; transition: transform .2s ease, background .2s ease; }
.button:hover, .button:focus-visible { transform: translateY(-2px); }
.button.primary { color: var(--white); background: var(--heat); box-shadow: 0 12px 30px rgba(239,108,53,.28); }
.button.secondary { border-color: rgba(255,255,255,.35); color: var(--white); background: rgba(255,255,255,.05); }

.thermal-visual { position: relative; width: min(500px, 40vw); aspect-ratio: 1; justify-self: center; display: grid; place-items: center; }
.thermal-visual::before { content: ""; position: absolute; inset: 18%; border-radius: 50%; background: radial-gradient(circle, rgba(255,162,91,.34), rgba(239,108,53,.06) 58%, transparent 70%); filter: blur(4px); }
.orbit { position: absolute; border: 1px solid rgba(255,255,255,.26); border-radius: 50%; }
.orbit-one { inset: 7%; }
.orbit-two { inset: 20%; border-style: dashed; transform: rotate(22deg); }
.orbit::after { content: ""; position: absolute; width: 13px; aspect-ratio: 1; border-radius: 50%; background: var(--heat-light); box-shadow: 0 0 24px var(--heat); }
.orbit-one::after { top: 12%; left: 16%; }
.orbit-two::after { right: 3%; bottom: 23%; }
.core { position: relative; z-index: 2; width: 46%; aspect-ratio: 1; display: grid; place-content: center; border-radius: 50%; text-align: center; background: linear-gradient(145deg, rgba(255,255,255,.14), rgba(255,255,255,.025)); border: 1px solid rgba(255,255,255,.34); box-shadow: inset 0 0 50px rgba(239,108,53,.18), 0 30px 60px rgba(0,0,0,.28); backdrop-filter: blur(10px); }
.core span { font: 500 .7rem Arial, sans-serif; letter-spacing: .36em; color: #ffd0ae; }
.core strong { margin-top: 8px; font: 700 1.1rem Arial, sans-serif; letter-spacing: .18em; }
.metric { position: absolute; padding: 8px 12px; border: 1px solid rgba(255,255,255,.18); border-radius: 999px; color: #c9d8dd; background: rgba(5,21,29,.5); font: 600 .58rem Arial, sans-serif; letter-spacing: .18em; }
.metric-a { top: 17%; right: 1%; } .metric-b { bottom: 7%; left: 18%; } .metric-c { left: 1%; top: 39%; }
.hero-rule { position: absolute; bottom: 0; left: 8%; right: 8%; height: 1px; background: linear-gradient(90deg, transparent, rgba(255,255,255,.3), transparent); }

.section { padding: 120px 0; }
.split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 12%; align-items: start; }
h2 { margin-bottom: 24px; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(2rem, 4vw, 3.45rem); line-height: 1.35; font-weight: 600; }
.intro-copy { padding-top: 54px; font-size: 1.02rem; color: #334750; }
.intro-copy p { margin-bottom: 20px; }
.text-link { display: inline-flex; gap: 14px; align-items: center; margin-top: 14px; color: var(--blue); font-weight: 700; text-decoration: none; }
.text-link span { color: var(--heat); font-size: 1.4rem; }

.products { color: var(--white); background: var(--navy); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 48px; margin-bottom: 52px; }
.section-heading > p { max-width: 420px; color: #b9c8cd; }
.section-heading h2 { margin-bottom: 0; }
.section-index.light { color: var(--heat-light); }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.product-card { position: relative; overflow: hidden; min-height: 380px; padding: 28px; border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius); background: rgba(255,255,255,.035); }
.product-card.featured { background: linear-gradient(160deg, rgba(239,108,53,.22), rgba(255,255,255,.04)); }
.product-no { color: #90a5ad; font: 600 .65rem Arial, sans-serif; letter-spacing: .2em; }
.product-icon { position: relative; height: 145px; margin: 20px 0 28px; display: grid; place-items: center; }
.product-icon::before, .product-icon::after, .product-icon i { content: ""; position: absolute; border: 1px solid rgba(255,255,255,.38); }
.product-icon::before { width: 102px; height: 102px; border-radius: 50%; }
.product-icon::after { width: 70px; height: 70px; border-radius: 50%; border-color: var(--heat-light); box-shadow: 0 0 36px rgba(239,108,53,.25); }
.product-icon i { width: 130px; height: 1px; border: 0; background: linear-gradient(90deg, transparent, rgba(255,255,255,.5), transparent); transform: rotate(-26deg); }
.mantle::before { border-radius: 38%; transform: scaleX(.7); }
.ribbon::after { border-radius: 50% 10% 50% 10%; transform: rotate(35deg); }
.film::before { border-radius: 8px; transform: rotate(-12deg) scale(.85); }
.product-card h3 { font-size: 1.14rem; letter-spacing: .04em; }
.product-card p { margin: 0; color: #b9c8cd; font-size: .88rem; }
.product-note { margin: 32px 0 0; color: #9fb0b7; font-size: .78rem; }

.contact-strip { padding: 90px 0; background: #e8e4db; }
.contact-strip.compact { padding: 72px 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.contact-grid h2 { margin-bottom: 10px; }
.phone-card { display: flex; flex-direction: column; padding: 28px 34px; border-radius: var(--radius); color: var(--white); background: var(--heat); text-decoration: none; box-shadow: var(--shadow); }
.phone-card span { font-size: .78rem; letter-spacing: .08em; }
.phone-card strong { font: 700 clamp(1.8rem, 4vw, 3rem)/1.25 Arial, sans-serif; letter-spacing: .04em; }
.phone-card small { opacity: .8; }

.site-footer { padding: 42px 0; color: #c4d0d4; background: #06141c; }
.footer-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, auto) minmax(0, 1fr); gap: 40px; align-items: center; }
.footer-left { min-width: 0; display: flex; flex-direction: column; align-items: flex-start; }
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-inner span, .footer-inner small { font-size: .72rem; }
.footer-inner small { justify-self: end; }
.footer-inner nav a { font-size: .75rem; }
.footer-nav { justify-self: center; }
.footer-logo { position: relative; overflow: hidden; flex: 0 0 auto; width: 59px; height: 50px; }
.footer-logo img { position: absolute; left: -58px; top: -100px; width: 175px; max-width: none; height: auto; }

.page-hero { color: var(--white); background: linear-gradient(135deg, #0b2635, #17485a); }
.page-hero-inner { min-height: 460px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 40px; }
.page-hero h1 { margin: 0 0 15px; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(3rem, 7vw, 5.6rem); font-weight: 600; }
.page-hero p:last-child { color: #c7d5da; }
.company-monogram { width: min(260px, 28vw); aspect-ratio: 1; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; background: radial-gradient(circle, rgba(239,108,53,.3), transparent 65%); }
.company-monogram span { font: 500 clamp(4rem, 9vw, 7rem)/1 "Yu Mincho", serif; color: #ffd1af; }
.philosophy blockquote { margin: 0; padding: 42px; border-left: 3px solid var(--heat); background: var(--white); box-shadow: var(--shadow); }
.philosophy blockquote strong { display: block; margin-bottom: 22px; color: var(--heat); font: 500 3.5rem/1 "Yu Mincho", serif; }
.philosophy blockquote p { margin: 0; font-size: 1.05rem; }
.profile { background: var(--white); }
.profile-grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: 10%; }
.profile-lead { max-width: 380px; color: var(--muted); font-size: .88rem; }
.company-data { margin: 0; border-top: 1px solid var(--line); }
.company-data div { display: grid; grid-template-columns: 150px 1fr; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.company-data dt { color: var(--muted); font-size: .82rem; }
.company-data dd { margin: 0; font-weight: 600; }
.business { background: #e8e4db; }
.section-heading.dark > p { color: var(--muted); }
.business-list { border-top: 1px solid #bfc7c8; }
.business-list article { display: grid; grid-template-columns: 70px 220px 1fr; gap: 30px; align-items: baseline; padding: 28px 0; border-bottom: 1px solid #bfc7c8; }
.business-list article span { color: var(--heat); font: 700 .7rem Arial, sans-serif; }
.business-list h3, .business-list p { margin: 0; }
.business-list h3 { font-size: 1rem; }
.business-list p { color: #4d5c63; }

:focus-visible { outline: 3px solid var(--heat-light); outline-offset: 4px; }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; padding: 160px 0 90px; }
  .thermal-visual { position: absolute; right: -18%; bottom: -6%; width: 58vw; opacity: .45; }
  .hero-copy { position: relative; z-index: 3; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .split, .profile-grid { grid-template-columns: 1fr; gap: 40px; }
  .intro-copy { padding-top: 0; }
  .business-list article { grid-template-columns: 48px 180px 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; text-align: center; justify-items: center; }
  .footer-left { align-items: center; }
  .footer-inner small { justify-self: center; }
}
@media (max-width: 680px) {
  .shell { width: min(100% - 32px, 1180px); }
  .header-inner { min-height: 76px; gap: 10px; }
  .brand-logo { width: 56px; height: 48px; }
  .brand-logo img { left: -55px; top: -95px; width: 167px; }
  .brand-name { display: none; }
  .header-actions { gap: 9px; }
  .main-nav { gap: 10px; }
  .main-nav a { font-size: .72rem; letter-spacing: .02em; white-space: nowrap; }
  .language-menu summary { gap: 5px; padding: 0 8px; font-size: .68rem; letter-spacing: .01em; }
  .language-options { right: 0; width: 180px; }
  .hero, .hero-grid { min-height: 680px; }
  .hero h1 { font-size: clamp(2.7rem, 15vw, 4.5rem); }
  .hero h1.hero-title-ja { font-size: clamp(2.25rem, 10.8vw, 4.5rem); line-height: 1.24; }
  .hero h1.hero-title-en { font-size: clamp(2rem, 10vw, 4rem); line-height: 1.2; }
  .hero h1.hero-title-zh { font-size: clamp(2rem, 10vw, 4.25rem); line-height: 1.24; }
  .section { padding: 80px 0; }
  .section-heading, .contact-grid { display: grid; grid-template-columns: 1fr; gap: 24px; align-items: start; }
  .phone-card { padding: 24px; }
  .phone-card strong { font-size: clamp(1.45rem, 6vw, 3rem); white-space: nowrap; }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { min-height: 330px; }
  .page-hero-inner { min-height: 390px; }
  .company-monogram { width: 130px; }
  .company-data div { grid-template-columns: 100px 1fr; }
  .business-list article { grid-template-columns: 40px 1fr; gap: 12px; }
  .business-list article p { grid-column: 2; }
  .footer-inner { gap: 20px; }
  .footer-nav { flex-wrap: wrap; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}