:root {
  --ink: #171513;
  --muted: #716b64;
  --paper: #f7f4ef;
  --white: #fffdf9;
  --gold: #a98b5e;
  --line: rgba(23, 21, 19, 0.16);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
}

a { color: inherit; }

.site-header {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px clamp(24px, 6vw, 88px);
}

.brand {
  display: inline-flex;
  flex-direction: column;
  line-height: 1;
  text-decoration: none;
}

.brand-mark { font-size: 32px; letter-spacing: 0.22em; }
.brand-sub { margin-top: 8px; font: 10px/1 Arial, sans-serif; letter-spacing: 0.42em; }

nav { display: flex; gap: 32px; }
nav a { font: 13px/1.4 "Yu Gothic", sans-serif; text-decoration: none; }
nav a:hover { color: var(--gold); }

.hero {
  min-height: 92vh;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  overflow: hidden;
  padding: 130px clamp(24px, 8vw, 120px) 80px;
  background:
    radial-gradient(circle at 74% 46%, rgba(255,255,255,0.92), transparent 27%),
    linear-gradient(135deg, #f8f5ef 0%, #e9e1d4 100%);
}

.hero-copy { position: relative; z-index: 2; }
.eyebrow { margin: 0 0 24px; color: var(--gold); font: 12px/1.4 Arial, sans-serif; letter-spacing: 0.28em; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 28px; font-size: clamp(44px, 6vw, 86px); font-weight: 400; line-height: 1.25; letter-spacing: 0.04em; }
.lead { max-width: 560px; color: var(--muted); font-size: clamp(15px, 1.4vw, 18px); line-height: 2; }

.primary-link {
  display: inline-block;
  margin-top: 22px;
  padding: 16px 28px;
  border: 1px solid var(--ink);
  font: 13px/1 Arial, sans-serif;
  text-decoration: none;
  transition: 180ms ease;
}
.primary-link:hover { color: var(--white); background: var(--ink); }

.pearl-stage { position: relative; min-height: 540px; }
.pearl {
  position: absolute;
  display: block;
  border-radius: 50%;
  background:
    radial-gradient(circle at 31% 26%, #fff 0 5%, #fcf8f1 11%, #e8dfd3 38%, #b8aa99 72%, #776c60 100%);
  box-shadow: inset -28px -30px 50px rgba(50, 38, 24, 0.18), 0 34px 54px rgba(48, 36, 24, 0.18);
}
.pearl-large { width: min(34vw, 460px); aspect-ratio: 1; top: 14%; left: 10%; }
.pearl-small { width: min(11vw, 150px); aspect-ratio: 1; right: 4%; bottom: 16%; opacity: 0.86; }
.orbit { position: absolute; width: 86%; height: 58%; top: 20%; left: 1%; border: 1px solid rgba(169,139,94,0.55); border-radius: 50%; transform: rotate(-18deg); }

.section { padding: clamp(76px, 10vw, 150px) clamp(24px, 8vw, 120px); }
.intro-section { display: grid; grid-template-columns: 120px minmax(0, 800px); gap: 42px; justify-content: center; background: var(--white); }
.section-number { color: var(--gold); font: 13px/1 Arial, sans-serif; }
h2 { font-size: clamp(32px, 4.5vw, 62px); font-weight: 400; line-height: 1.4; }
.intro-section > div > p:last-child { max-width: 720px; color: var(--muted); font-size: 16px; line-height: 2.15; }

.business-section { background: #1c1a18; color: var(--white); }
.section-heading { margin-bottom: 56px; }
.business-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid rgba(255,255,255,0.22); }
.business-grid article { min-height: 290px; padding: 40px 34px; border-right: 1px solid rgba(255,255,255,0.22); }
.business-grid article:last-child { border-right: 0; }
.business-grid article > span { color: var(--gold); font: 12px/1 Arial, sans-serif; }
.business-grid h3 { margin: 62px 0 20px; font-size: 24px; font-weight: 400; }
.business-grid p { color: #c8c2ba; line-height: 1.9; }

.company-section { display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 8vw; background: var(--white); }
.company-section dl { margin: 0; border-top: 1px solid var(--line); }
.company-section dl > div { display: grid; grid-template-columns: 150px 1fr; padding: 24px 0; border-bottom: 1px solid var(--line); }
.company-section dt { color: var(--muted); font-size: 13px; }
.company-section dd { margin: 0; line-height: 1.8; }
.company-section dd a { text-underline-offset: 4px; }

footer {
  display: flex;
  justify-content: space-between;
  align-items: end;
  padding: 52px clamp(24px, 8vw, 120px);
  color: var(--white);
  background: #0e0d0c;
}
footer div { display: flex; flex-direction: column; }
footer strong { font-size: 34px; font-weight: 400; letter-spacing: 0.24em; }
footer span, footer p { color: #aaa39a; font: 10px/1.5 Arial, sans-serif; letter-spacing: 0.2em; }

@media (max-width: 760px) {
  .site-header { padding: 20px; }
  nav { gap: 14px; }
  nav a { font-size: 11px; }
  .brand-mark { font-size: 25px; }
  .hero { min-height: 850px; grid-template-columns: 1fr; align-content: center; padding: 110px 24px 54px; }
  .hero-copy { align-self: end; }
  h1 { font-size: clamp(42px, 13vw, 62px); }
  .pearl-stage { grid-row: 1; min-height: 310px; }
  .pearl-large { width: 260px; left: 12%; }
  .pearl-small { width: 86px; }
  .intro-section { grid-template-columns: 1fr; gap: 16px; }
  .business-grid { grid-template-columns: 1fr; }
  .business-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid rgba(255,255,255,0.22); }
  .business-grid h3 { margin-top: 28px; }
  .company-section { grid-template-columns: 1fr; }
  .company-section dl > div { grid-template-columns: 92px 1fr; }
  footer { align-items: center; gap: 30px; }
}