:root {
  --ink: #1d2229;
  --navy: #172b48;
  --blue: #2d4f79;
  --concrete: #e8eaeb;
  --paper: #f8f8f6;
  --white: #fff;
  --muted: #69717b;
  --line: #d4d7da;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif; line-height: 1.8; overflow-x: hidden; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
section { scroll-margin-top: 80px; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 200; padding: .7rem 1rem; color: white; background: var(--ink); }
.skip-link:focus { top: 1rem; }
.eyebrow { margin: 0 0 1rem; color: var(--blue); font: 700 .72rem/1.2 Arial, sans-serif; letter-spacing: .22em; }
.pc-only { display: inline; }

.site-header { position: fixed; inset: 0 0 auto; z-index: 100; background: rgba(248,248,246,.93); border-bottom: 1px solid rgba(29,34,41,.1); backdrop-filter: blur(14px); }
.header-inner { max-width: 1280px; height: 82px; margin: auto; padding: 0 4vw; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: .8rem; }
.brand-symbol { display: grid; place-items: center; width: 43px; height: 43px; color: white; background: var(--navy); font: 700 1.22rem/1 "Yu Mincho", serif; }
.brand-name { display: grid; line-height: 1.05; }
.brand-name strong { font-size: 1rem; letter-spacing: .08em; }
.brand-name small { margin-top: .4rem; color: var(--muted); font: 600 .57rem/1 Arial, sans-serif; letter-spacing: .2em; }
.site-nav { display: flex; align-items: center; gap: 1.7rem; font-size: .78rem; font-weight: 700; }
.site-nav a:not(.nav-cta) { position: relative; }
.site-nav a:not(.nav-cta)::after { content: ""; position: absolute; left: 0; bottom: -.45rem; width: 0; height: 1px; background: var(--navy); transition: width .25s ease; }
.site-nav a:hover::after { width: 100%; }
.nav-cta { padding: .7rem 1.15rem; color: white; background: var(--navy); }
.menu-button { display: none; padding: .5rem; border: 0; background: transparent; }
.menu-button span { display: block; width: 25px; height: 2px; margin: 5px 0; background: var(--ink); }

.hero { max-width: 1440px; min-height: 800px; margin: auto; padding: 122px 4vw 54px; display: grid; grid-template-columns: .95fr 1.05fr; align-items: stretch; gap: clamp(2.5rem, 5vw, 6rem); }
.hero-content { padding: clamp(3rem, 8vh, 6rem) 0 1rem clamp(0rem, 3vw, 2.5rem); display: flex; flex-direction: column; justify-content: center; }
.hero h1 { margin: 0; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(3rem, 3.6vw, 4rem); font-weight: 500; line-height: 1.28; letter-spacing: -.04em; }
.hero h1 span { color: var(--blue); font-size: 1.13em; }
.hero-lead { margin: 1.8rem 0 2rem; font-weight: 600; }
.hero-actions { display: flex; align-items: center; gap: 1.8rem; flex-wrap: wrap; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 1.4rem; min-height: 58px; padding: .9rem 1.7rem; border: 1px solid transparent; font-weight: 700; font-size: .9rem; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: var(--navy); }
.button-primary:hover { background: #0f213a; }
.button-light { color: var(--navy); background: white; }
.under-link { border-bottom: 1px solid var(--ink); font-size: .84rem; font-weight: 700; }
.hero-facts { margin: 3rem 0 0; padding: 1.5rem 0 0; display: grid; grid-template-columns: repeat(3, 1fr); list-style: none; border-top: 1px solid var(--line); }
.hero-facts li { display: flex; align-items: center; gap: .7rem; }
.hero-facts li + li { padding-left: 1.2rem; border-left: 1px solid var(--line); }
.hero-facts strong { color: var(--navy); font: 500 2rem/1 "Yu Mincho", serif; }
.hero-facts span { color: var(--muted); font: 600 .58rem/1.55 Arial, sans-serif; letter-spacing: .1em; }
.hero-photo { position: relative; min-height: 620px; overflow: hidden; background: var(--concrete); }
.hero-photo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, rgba(15,28,45,.72)); }
.hero-photo img { filter: saturate(.72) contrast(1.03); }
.hero-photo .photo-tag { position: absolute; z-index: 2; top: 1.6rem; right: 1.6rem; padding: .65rem .9rem; color: white; border: 1px solid rgba(255,255,255,.7); font: 700 .65rem/1 Arial, sans-serif; letter-spacing: .18em; }
.hero-photo p { position: absolute; z-index: 2; left: 2.2rem; bottom: 1.9rem; margin: 0; color: white; font: 500 clamp(1.8rem, 3vw, 3.3rem)/1.4 "Yu Mincho", serif; }

.section { max-width: var(--max); margin: 0 auto; padding: 120px 4vw; }
.section-head { max-width: 720px; margin-bottom: 3.5rem; }
.section h2, .works h2, .partners h2, .area h2, .contact h2 { margin: 0; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(2.3rem, 4.3vw, 4.2rem); font-weight: 500; line-height: 1.35; letter-spacing: -.03em; }
.section-head > p:last-child { margin: 1.3rem 0 0; color: var(--muted); }

.about { display: grid; grid-template-columns: .8fr 1.2fr; align-items: center; gap: clamp(4rem, 10vw, 9rem); }
.about-number { position: relative; min-height: 440px; display: grid; place-items: center; color: white; background: var(--navy); overflow: hidden; }
.about-number::before { content: ""; position: absolute; inset: 12%; border: 1px solid rgba(255,255,255,.25); }
.about-number span { position: absolute; top: 2.5rem; left: 2.5rem; font-weight: 700; letter-spacing: .16em; }
.about-number strong { position: relative; font: 400 clamp(8rem, 16vw, 13rem)/1 "Yu Mincho", serif; }
.about-number small { position: absolute; right: 2.5rem; bottom: 2.4rem; font: 700 .7rem/1 Arial, sans-serif; letter-spacing: .22em; }
.about-copy > p:not(.eyebrow) { color: var(--muted); }
.about-data { margin: 2.4rem 0 0; border-top: 1px solid var(--line); }
.about-data div { padding: 1rem 0; display: grid; grid-template-columns: 7rem 1fr; border-bottom: 1px solid var(--line); }
.about-data dt { color: var(--blue); font: 700 .67rem/1.8 Arial, sans-serif; letter-spacing: .18em; }
.about-data dd { margin: 0; font-weight: 700; }

.services { background: var(--concrete); }
.services-inner { padding-block: 110px; }
.service-list { border-top: 1px solid #c5c9cd; }
.service-item { display: grid; grid-template-columns: 4rem 1fr 1.3fr; gap: 2rem; align-items: center; padding: 1.8rem 0; border-bottom: 1px solid #c5c9cd; }
.service-item span { color: var(--blue); font: 700 .7rem/1 Arial, sans-serif; letter-spacing: .15em; }
.service-item h3 { margin: 0; font-size: 1.08rem; }
.service-item p { margin: 0; color: var(--muted); font-size: .86rem; }

.works { padding: 120px 0; color: white; background: var(--ink); }
.works .eyebrow { color: #9cb0c9; }
.works-heading { max-width: var(--max); margin: 0 auto 3.5rem; padding: 0 4vw; display: grid; grid-template-columns: 1fr .75fr; align-items: end; gap: 4rem; }
.works-heading > p { margin: 0; color: #b7bdc4; font-size: .88rem; }
.works-grid { max-width: 1320px; margin: auto; padding: 0 3vw; display: grid; grid-template-columns: repeat(4,1fr); grid-auto-rows: 390px; gap: 1px; background: #4b5056; }
.work-card { position: relative; margin: 0; overflow: hidden; background: #333; }
.work-large { grid-column: span 2; grid-row: span 2; }
.work-wide { grid-column: span 2; }
.work-card img { filter: saturate(.72); transition: transform .6s ease, filter .6s ease; }
.work-card:hover img { transform: scale(1.035); filter: saturate(1); }
.work-card figcaption { position: absolute; inset: auto 0 0; padding: 2.8rem 1.2rem 1.1rem; display: flex; gap: .8rem; align-items: center; color: white; background: linear-gradient(transparent,rgba(0,0,0,.72)); font-size: .84rem; font-weight: 700; }
.work-card figcaption span { color: #a8b9cf; font-size: .64rem; }

.strength-grid { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 3.5rem; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.strength-card { min-height: 340px; padding: 2.2rem 1.8rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.strength-num { display: block; margin-bottom: 4.5rem; color: var(--navy); font: 400 3.8rem/1 "Yu Mincho", serif; }
.strength-card h3 { margin: 0 0 .9rem; }
.strength-card p { margin: 0; color: var(--muted); font-size: .86rem; }

.partners { display: grid; grid-template-columns: 1fr 1fr; min-height: 680px; background: var(--navy); color: white; }
.partners-photo { min-height: 600px; }
.partners-photo img { filter: saturate(.55) contrast(1.08); }
.partners-copy { padding: clamp(5rem, 10vw, 9rem); display: flex; flex-direction: column; justify-content: center; }
.partners .eyebrow { color: #a8bbd2; }
.partners-copy > p:not(.eyebrow) { margin: 1.7rem 0 2.2rem; color: #c8d0da; }
.partners-copy .button { align-self: flex-start; }

.area { max-width: var(--max); margin: 0 auto; padding: 120px 4vw; display: grid; grid-template-columns: 1.15fr .85fr; align-items: center; gap: 4rem; }
.area-inner > p:not(.eyebrow) { color: var(--muted); }
.area-mark { position: relative; min-height: 330px; display: grid; place-content: center; text-align: center; border: 1px solid var(--line); background: radial-gradient(circle at center, rgba(45,79,121,.08) 0 24%, transparent 25%); }
.area-mark::before, .area-mark::after { content: ""; position: absolute; background: var(--line); }
.area-mark::before { width: 1px; inset: 0 50%; }
.area-mark::after { height: 1px; inset: 50% 0; }
.area-mark span { position: relative; z-index: 1; width: 18px; height: 18px; margin: 0 auto 1rem; border: 5px solid var(--navy); border-radius: 50%; background: white; box-shadow: 0 0 0 10px rgba(23,43,72,.14); }
.area-mark strong, .area-mark small { position: relative; z-index: 1; }
.area-mark strong { font: 700 1.3rem/1.4 Arial,sans-serif; letter-spacing: .2em; }
.area-mark small { color: var(--muted); font: 600 .65rem/1.8 Arial,sans-serif; letter-spacing: .2em; }

.contact { padding: 130px 5vw; background: var(--concrete); }
.contact-inner { max-width: 900px; margin: auto; text-align: center; }
.contact-inner > p:not(.eyebrow) { margin: 1.5rem 0 2rem; color: var(--muted); }
.site-footer { padding: 50px 5vw 30px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 1rem 2rem; color: var(--muted); border-top: 1px solid var(--line); font-size: .72rem; }
.footer-brand { color: var(--ink); }
.proposal { grid-column: 1 / -1; margin: 1.5rem 0 0; padding-top: 1.5rem; border-top: 1px solid var(--line); text-align: center; letter-spacing: .18em; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1020px) {
  .site-nav { position: fixed; inset: 82px 0 auto; padding: 2rem 6vw; display: grid; gap: 0; background: var(--paper); border-bottom: 1px solid var(--line); opacity: 0; visibility: hidden; transform: translateY(-10px); transition: .25s; }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .site-nav a { padding: 1rem 0; border-bottom: 1px solid var(--line); }
  .site-nav .nav-cta { margin-top: 1rem; padding: .9rem 1rem; text-align: center; }
  .menu-button { display: block; }
  .hero { grid-template-columns: 1fr; }
  .hero-photo { min-height: 580px; }
  .works-grid { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 680px) {
  section { scroll-margin-top: 70px; }
  .header-inner { height: 70px; padding: 0 5vw; }
  .brand-symbol { width: 38px; height: 38px; }
  .site-nav { top: 70px; }
  .hero { min-height: auto; padding: 110px 5vw 70px; gap: 3rem; }
  .hero-content { padding: 0; }
  .hero h1 { font-size: clamp(2.2rem, 9.5vw, 2.8rem); line-height: 1.32; }
  .hero-lead { margin-top: 1.4rem; }
  .pc-only { display: none; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 1rem; }
  .hero .button { width: 100%; }
  .under-link { align-self: flex-start; }
  .hero-facts { gap: 0; }
  .hero-facts li { display: grid; gap: .3rem; }
  .hero-facts li + li { padding-left: .8rem; }
  .hero-facts strong { font-size: 1.55rem; }
  .hero-facts span { font-size: .5rem; }
  .hero-photo { min-height: 470px; }
  .hero-photo p { left: 1.3rem; bottom: 1.2rem; font-size: 2rem; }
  .section { padding: 86px 5vw; }
  .section h2, .works h2, .partners h2, .area h2, .contact h2 { font-size: clamp(2rem, 10vw, 3rem); }
  .about { grid-template-columns: 1fr; gap: 3.5rem; }
  .about-number { min-height: 340px; }
  .about-number strong { font-size: 10rem; }
  .services-inner { padding-block: 86px; }
  .service-item { grid-template-columns: 2.5rem 1fr; gap: .8rem 1rem; }
  .service-item p { grid-column: 2; }
  .works { padding: 86px 0; }
  .works-heading { grid-template-columns: 1fr; gap: 1.5rem; padding: 0 5vw; }
  .works-grid { padding: 0; grid-template-columns: 1fr 1fr; grid-auto-rows: 270px; }
  .work-large { grid-column: span 2; grid-row: span 1; }
  .work-wide { grid-column: span 2; }
  .work-card figcaption { padding: 2rem .8rem .85rem; font-size: .73rem; }
  .strength-grid { grid-template-columns: 1fr; }
  .strength-card { min-height: 250px; }
  .strength-num { margin-bottom: 2.8rem; }
  .partners { grid-template-columns: 1fr; }
  .partners-photo { min-height: 430px; }
  .partners-copy { padding: 80px 5vw; }
  .area { grid-template-columns: 1fr; padding: 86px 5vw; }
  .area-mark { min-height: 280px; }
  .contact { padding: 90px 5vw; }
  .site-footer { grid-template-columns: 1fr; text-align: center; }
  .footer-brand { justify-self: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}