:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --ink: #172019;
  --muted: #687068;
  --line: #d8d8cf;
  --accent: #536e59;
  --accent-deep: #263d2b;
  --soft: #e4e8df;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }

.section-shell { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.section-block { padding-block: 112px; }
.eyebrow { margin: 0 0 18px; font-size: 12px; letter-spacing: .22em; font-weight: 700; color: var(--accent); }
.eyebrow.light { color: #bfcabb; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px max(20px, calc((100vw - var(--max)) / 2));
  background: rgba(246, 244, 239, .9);
  border-bottom: 1px solid rgba(23,32,25,.08);
  backdrop-filter: blur(16px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark { display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--ink); border-radius: 50%; font-family: Georgia, serif; font-size: 20px; }
.brand-copy { display: grid; line-height: 1.1; }
.brand-copy strong { font-size: 13px; letter-spacing: .12em; }
.brand-copy small { margin-top: 5px; font-size: 9px; letter-spacing: .22em; color: var(--muted); }
.global-nav { display: flex; align-items: center; gap: 28px; font-size: 13px; font-weight: 600; }
.global-nav a { opacity: .8; }
.global-nav a:hover { opacity: 1; }
.global-nav .nav-cta { padding: 10px 16px; color: white; background: var(--accent-deep); border-radius: 999px; opacity: 1; }
.menu-button { display: none; border: 0; background: transparent; font: inherit; }

.hero {
  min-height: 720px;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 64px;
  padding-block: 70px 90px;
}
.hero h1 { margin: 0; max-width: 760px; font-family: Georgia, "Yu Mincho", serif; font-weight: 500; font-size: clamp(46px, 6vw, 86px); line-height: 1.18; letter-spacing: -.035em; }
.hero h1 span { color: var(--accent); }
.lead { max-width: 650px; margin: 28px 0 0; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 52px; padding: 0 24px; border-radius: 999px; font-size: 14px; font-weight: 700; }
.button.primary { color: white; background: var(--accent-deep); }
.button.secondary { border: 1px solid var(--line); background: rgba(255,255,255,.45); }
.button.disabled { opacity: .5; pointer-events: none; }
.notice { max-width: 620px; margin-top: 20px; color: var(--muted); font-size: 11px; }

.hero-visual { position: relative; min-height: 560px; overflow: hidden; border-radius: 260px 260px 30px 30px; background: linear-gradient(145deg, #dbe1d6, #afbaa9); }
.arch { position: absolute; border-radius: 50% 50% 18px 18px; }
.arch-back { inset: 10% 12% 14%; border: 1px solid rgba(255,255,255,.7); }
.arch-front { inset: 21% 24% 0; background: linear-gradient(180deg, rgba(255,255,255,.45), rgba(255,255,255,.05)); border: 1px solid rgba(255,255,255,.5); }
.visual-card { position: absolute; right: 28px; bottom: 28px; width: min(300px, calc(100% - 56px)); padding: 26px; background: rgba(255,255,255,.88); backdrop-filter: blur(12px); }
.visual-card span, .visual-card small { display: block; color: var(--muted); font-size: 10px; letter-spacing: .16em; }
.visual-card strong { display: block; margin: 10px 0 6px; font-family: Georgia, serif; font-size: 26px; font-weight: 500; }

.split-heading { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: start; }
.split-heading h2, .section-title-row h2, .principles h2, .contact h2 { margin: 0; font-family: Georgia, "Yu Mincho", serif; font-weight: 500; font-size: clamp(36px, 5vw, 62px); line-height: 1.25; letter-spacing: -.025em; }
.split-heading p { max-width: 620px; margin: 6px 0 0; color: var(--muted); font-size: 16px; }

.section-title-row { display: flex; justify-content: space-between; gap: 40px; align-items: end; }
.section-title-row > p { max-width: 500px; margin: 0; color: var(--muted); }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 44px; }
.service-card { min-height: 310px; padding: 34px; background: var(--surface); border: 1px solid var(--line); }
.service-number { display: block; color: var(--accent); font-family: Georgia, serif; font-size: 14px; }
.service-card h3 { margin: 94px 0 12px; font-family: Georgia, "Yu Mincho", serif; font-size: 30px; font-weight: 500; }
.service-card p { margin: 0; color: var(--muted); font-size: 14px; }

.principles { color: white; background: var(--accent-deep); }
.principles-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; }
.principle-list { border-top: 1px solid rgba(255,255,255,.2); }
.principle-list > div { display: grid; grid-template-columns: 52px 1fr; gap: 14px; padding: 22px 0; border-bottom: 1px solid rgba(255,255,255,.2); }
.principle-list span { color: #bfcabb; font-family: Georgia, serif; }
.principle-list p { margin: 0; color: #dbe2d9; }
.principle-list strong { display: block; margin-bottom: 3px; color: white; font-size: 15px; }

.company-panel { margin-top: 34px; border-top: 1px solid var(--line); }
.company-panel > div { display: grid; grid-template-columns: 220px 1fr; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.company-panel span { color: var(--muted); font-size: 13px; }
.company-panel strong { font-size: 14px; font-weight: 600; }

.contact-box { padding: clamp(36px, 7vw, 88px); background: var(--soft); border-radius: 3px; }
.contact-box p:not(.eyebrow) { max-width: 660px; color: var(--muted); }
.contact-box .button { margin-top: 18px; }

.site-footer { display: flex; justify-content: space-between; align-items: end; gap: 30px; padding-block: 34px 44px; border-top: 1px solid var(--line); }
.site-footer > small { color: var(--muted); font-size: 10px; }

@media (max-width: 900px) {
  .site-header { padding-inline: 20px; }
  .menu-button { display: block; }
  .global-nav { position: absolute; inset: 74px 20px auto; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px; background: white; border: 1px solid var(--line); box-shadow: 0 16px 50px rgba(0,0,0,.08); }
  .global-nav.open { display: flex; }
  .global-nav a { padding: 14px; }
  .global-nav .nav-cta { margin-top: 4px; text-align: center; }
  .hero { grid-template-columns: 1fr; min-height: auto; gap: 42px; padding-top: 58px; }
  .hero-visual { min-height: 480px; }
  .split-heading, .principles-inner { grid-template-columns: 1fr; gap: 42px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card { min-height: 220px; }
  .service-card h3 { margin-top: 52px; }
  .section-title-row { align-items: start; flex-direction: column; }
}

@media (max-width: 620px) {
  .section-shell { width: min(calc(100% - 28px), var(--max)); }
  .section-block { padding-block: 76px; }
  .brand-copy strong { font-size: 11px; }
  .hero { padding-block: 48px 72px; }
  .hero h1 { font-size: clamp(42px, 13vw, 64px); }
  .lead { font-size: 15px; }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .hero-visual { min-height: 410px; border-radius: 200px 200px 24px 24px; }
  .visual-card { right: 18px; bottom: 18px; width: calc(100% - 36px); padding: 20px; }
  .company-panel > div { grid-template-columns: 1fr; gap: 5px; }
  .site-footer { align-items: start; flex-direction: column; }
}