:root {
  --ink: #182c3c;
  --navy: #17324d;
  --navy-deep: #10283d;
  --teal: #16766a;
  --teal-light: #dceeea;
  --paper: #f6f5f0;
  --paper-dark: #ebe9e1;
  --white: #fff;
  --muted: #65737d;
  --line: #d7d9d6;
  --orange: #d56a43;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.site-header {
  height: 88px;
  padding: 0 clamp(24px, 4vw, 72px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,.97);
  border-bottom: 1px solid rgba(23,50,77,.12);
  position: sticky;
  top: 0;
  z-index: 30;
}

.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand img { width: 48px; height: 48px; object-fit: contain; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.15; }
.brand-copy strong { font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: 20px; letter-spacing: .09em; }
.brand-copy small { font-size: 9px; letter-spacing: .22em; margin-top: 5px; color: var(--teal); font-weight: 700; }

.nav { display: flex; align-items: center; gap: clamp(18px, 2.5vw, 40px); font-size: 13px; font-weight: 700; letter-spacing: .04em; }
.nav a { padding: 12px 0; transition: color .2s ease; }
.nav a:hover { color: var(--teal); }
.nav-contact { border: 1px solid var(--navy); padding: 12px 18px !important; }

.hero {
  min-height: min(760px, calc(100vh - 88px));
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 72px clamp(24px, 8vw, 132px);
  isolation: isolate;
}

.hero-photo { position: absolute; inset: 0; z-index: -2; background: url('/hero-supplies.png') center / cover no-repeat; }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(246,245,240,.98) 0%, rgba(246,245,240,.95) 37%, rgba(246,245,240,.36) 59%, rgba(246,245,240,.04) 100%);
}

.hero-copy { max-width: 620px; }
.eyebrow { margin: 0 0 22px; color: var(--teal); font: 700 11px/1.3 Arial, sans-serif; letter-spacing: .22em; }
.hero h1, .section-heading h2, .contact h2 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.42;
}
.hero h1 { font-size: clamp(42px, 5vw, 72px); }
.hero-lead { max-width: 580px; margin: 30px 0 0; font-size: 16px; line-height: 2; letter-spacing: .04em; }
.hero-actions { display: flex; align-items: center; gap: 34px; margin-top: 40px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; min-width: 210px; padding: 17px 20px; font-size: 14px; font-weight: 700; letter-spacing: .04em; transition: background .2s ease, transform .2s ease; }
.button-primary { background: var(--navy); color: var(--white); }
.button-primary:hover { background: var(--teal); transform: translateY(-2px); }
.text-link { font-size: 13px; font-weight: 700; border-bottom: 1px solid var(--navy); padding: 8px 0; }
.photo-note { position: absolute; right: 18px; bottom: 14px; margin: 0; color: rgba(24,44,60,.72); font-size: 10px; letter-spacing: .08em; }

.section { max-width: 1180px; margin: 0 auto; padding: 120px 36px; }
.section-wide { margin: 0 clamp(14px, 2vw, 32px); }
.section-heading h2 { font-size: clamp(34px, 4vw, 52px); }

.intro { display: grid; grid-template-columns: .75fr 1.25fr; gap: 12%; align-items: start; }
.intro-copy { padding-top: 42px; max-width: 650px; font-size: 15px; line-height: 2.15; letter-spacing: .03em; }
.intro-copy p { margin: 0 0 24px; }
.intro-copy .intro-lead { font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(21px, 2.4vw, 29px); line-height: 1.8; color: var(--navy); }

.strengths { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.strengths-grid { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 1180px; margin: 0 auto; }
.strength-card { min-height: 315px; padding: 52px 46px; border-right: 1px solid var(--line); }
.strength-card:last-child { border-right: 0; }
.card-no, .product-no { color: var(--teal); font: 700 12px/1 Arial, sans-serif; letter-spacing: .14em; }
.strength-card h3 { margin: 58px 0 18px; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: 22px; letter-spacing: .06em; }
.strength-card p { margin: 0; color: #53616b; font-size: 14px; line-height: 1.9; }

.products { padding-top: 140px; padding-bottom: 140px; }
.products-header { display: grid; grid-template-columns: .8fr 1.2fr; gap: 12%; margin-bottom: 72px; }
.products-header > p { margin: 45px 0 0; max-width: 600px; color: #53616b; font-size: 15px; line-height: 2; }
.product-list { border-top: 1px solid var(--navy); }
.product-row { border-bottom: 1px solid var(--line); }
.product-row summary { list-style: none; min-height: 130px; display: grid; grid-template-columns: 70px 1fr 160px 36px; align-items: center; gap: 24px; cursor: pointer; padding: 22px 18px 22px 8px; }
.product-row summary::-webkit-details-marker { display: none; }
.product-row summary:hover .product-title { color: var(--teal); }
.product-title { display: flex; flex-direction: column; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(23px, 2.6vw, 34px); font-weight: 600; letter-spacing: .05em; transition: color .2s; }
.product-label { color: #88939a; font: 700 10px/1 Arial, sans-serif; letter-spacing: .18em; }
.product-toggle { width: 30px; height: 30px; position: relative; }
.product-toggle::before, .product-toggle::after { content: ""; position: absolute; background: var(--navy); top: 14px; left: 5px; width: 20px; height: 1px; }
.product-toggle::after { transform: rotate(90deg); transition: transform .2s ease; }
.product-row[open] .product-toggle::after { transform: rotate(0); }
.product-detail { margin-left: 102px; padding: 0 18px 36px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; color: #53616b; font-size: 14px; line-height: 1.9; }
.product-detail p { margin: 0; }
.product-detail ul { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; }
.product-detail li::before { content: "—"; margin-right: 8px; color: var(--teal); }
.product-disclaimer { margin: 24px 0 0; color: #77828a; font-size: 11px; line-height: 1.7; }

.flow { background: var(--navy-deep); color: var(--white); padding: 100px clamp(24px, 6vw, 90px); }
.flow-inner { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: .75fr 1.25fr; gap: 9%; align-items: start; }
.section-heading.light .eyebrow { color: #6cc4b5; }
.flow-steps { display: grid; grid-template-columns: 1fr 30px 1fr 30px 1fr; align-items: center; margin-top: 56px; }
.flow-step { min-height: 220px; border-top: 1px solid rgba(255,255,255,.3); padding: 26px 4px; }
.flow-step > span { color: #6cc4b5; font: 700 10px/1 Arial, sans-serif; letter-spacing: .18em; }
.flow-step strong { display: block; margin: 48px 0 14px; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: 18px; letter-spacing: .05em; }
.flow-step p { margin: 0; color: #bdc9d0; font-size: 12px; line-height: 1.8; }
.flow-arrow { color: #6cc4b5; text-align: center; }

.company { display: grid; grid-template-columns: .7fr 1.3fr; gap: 10%; padding-top: 140px; padding-bottom: 140px; }
.company-table { margin: 0; border-top: 1px solid var(--navy); }
.company-table > div { display: grid; grid-template-columns: 150px 1fr; padding: 23px 4px; border-bottom: 1px solid var(--line); font-size: 14px; line-height: 1.8; }
.company-table dt { color: #6e7a83; font-size: 12px; }
.company-table dd { margin: 0; }
.company-table dd span { color: #6e7a83; font-size: 12px; }
.company-table .number { font-family: Arial, sans-serif; letter-spacing: .08em; }

.contact { background: var(--teal-light); padding: 110px clamp(24px, 8vw, 120px); }
.contact-inner { max-width: 1180px; margin: 0 auto; }
.contact h2 { font-size: clamp(34px, 4vw, 54px); }
.contact-lead { max-width: 720px; margin: 28px 0 50px; font-size: 15px; line-height: 2; }
.contact-content { display: grid; grid-template-columns: 1fr .9fr; gap: 10%; align-items: stretch; }
.contact-checklist { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px; align-content: start; }
.contact-checklist li { border-bottom: 1px solid rgba(23,50,77,.23); padding: 13px 2px; font-size: 13px; }
.contact-checklist li::before { content: "✓"; color: var(--teal); margin-right: 10px; font-weight: 700; }
.contact-placeholder { background: var(--white); border-left: 4px solid var(--teal); padding: 30px 34px; }
.contact-placeholder span { display: block; color: #67757d; font-size: 11px; letter-spacing: .12em; }
.contact-placeholder strong { display: block; margin: 11px 0 12px; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: 26px; }
.contact-placeholder p { margin: 0; color: #6b777f; font-size: 12px; line-height: 1.7; }

.footer { background: var(--paper); padding: 60px clamp(24px, 5vw, 78px) 28px; }
.footer-top { display: flex; align-items: flex-end; justify-content: space-between; padding-bottom: 55px; }
.footer-top > p { margin: 0; color: #65737d; font-size: 12px; }
.footer-bottom { border-top: 1px solid var(--line); padding-top: 22px; display: flex; justify-content: space-between; gap: 30px; color: #7b868d; font-size: 10px; line-height: 1.7; }
.footer-bottom p { margin: 0; }
.mobile-only { display: none; }

@media (max-width: 900px) {
  .site-header { height: auto; min-height: 76px; padding: 12px 20px; align-items: center; }
  .brand img { width: 42px; height: 42px; }
  .brand-copy strong { font-size: 17px; }
  .nav { gap: 16px; overflow-x: auto; margin-left: 20px; }
  .nav a { white-space: nowrap; font-size: 11px; }
  .nav a:nth-child(1), .nav a:nth-child(3) { display: none; }
  .hero { min-height: 720px; align-items: flex-end; padding-bottom: 76px; }
  .hero-photo { background-position: 62% center; }
  .hero::after { background: linear-gradient(0deg, rgba(246,245,240,.98) 0%, rgba(246,245,240,.92) 47%, rgba(246,245,240,.16) 82%); }
  .hero-copy { max-width: 620px; }
  .hero-lead { max-width: 520px; }
  .intro, .products-header, .company, .flow-inner { grid-template-columns: 1fr; gap: 44px; }
  .intro-copy, .products-header > p { padding-top: 0; margin-top: 0; }
  .strength-card { padding: 42px 26px; }
  .strength-card h3 { margin-top: 40px; font-size: 19px; }
  .flow-steps { margin-top: 8px; }
  .company-table { margin-top: 6px; }
}

@media (max-width: 640px) {
  .site-header { position: relative; }
  .nav { margin-left: 8px; }
  .nav a:not(.nav-contact) { display: none; }
  .nav-contact { padding: 10px 12px !important; }
  .hero { min-height: 680px; padding: 56px 22px 58px; }
  .hero-photo { background-position: 68% top; }
  .hero h1 { font-size: 39px; }
  .hero-lead { font-size: 14px; line-height: 1.85; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; margin-top: 30px; }
  .section { padding: 88px 22px; }
  .section-wide { margin: 0; }
  .section-heading h2 { font-size: 34px; }
  .intro { gap: 22px; }
  .intro-copy { font-size: 14px; }
  .strengths-grid { grid-template-columns: 1fr; }
  .strength-card { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 38px 28px; }
  .strength-card:last-child { border-bottom: 0; }
  .strength-card h3 { margin: 30px 0 14px; }
  .products { padding-top: 95px; padding-bottom: 95px; }
  .products-header { margin-bottom: 45px; }
  .product-row summary { min-height: 108px; grid-template-columns: 38px 1fr 28px; gap: 12px; padding-right: 4px; }
  .product-title { font-size: 23px; }
  .product-label { display: none; }
  .product-detail { margin-left: 50px; padding: 0 4px 30px; grid-template-columns: 1fr; gap: 18px; }
  .product-detail ul { grid-template-columns: 1fr; }
  .flow { padding: 84px 22px; }
  .flow-steps { grid-template-columns: 1fr; }
  .flow-step { min-height: auto; padding: 22px 2px 28px; }
  .flow-step strong { margin-top: 28px; }
  .flow-arrow { transform: rotate(90deg); text-align: left; margin: -5px 0 12px 8px; }
  .company { padding-top: 95px; padding-bottom: 95px; }
  .company-table > div { grid-template-columns: 95px 1fr; gap: 14px; padding: 19px 2px; font-size: 13px; }
  .contact { padding: 82px 22px; }
  .contact-content, .contact-checklist { grid-template-columns: 1fr; }
  .contact-content { gap: 38px; }
  .contact h2 { font-size: 34px; }
  .contact-placeholder { padding: 25px 26px; }
  .footer { padding: 50px 22px 24px; }
  .footer-top { align-items: flex-start; flex-direction: column; gap: 30px; padding-bottom: 38px; }
  .footer-bottom { flex-direction: column; gap: 12px; }
  .mobile-only { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}