:root {
  --ink: #132a37;
  --muted: #5e717a;
  --sea-900: #0d4c72;
  --sea-700: #176f9c;
  --sea-500: #24a5c4;
  --sea-100: #dff4f8;
  --sand: #fff8ef;
  --coral: #ef946c;
  --white: #fff;
  --line: #dce7eb;
  --shadow: 0 22px 60px rgba(18, 72, 95, .12);
  --radius-lg: 32px;
  --radius-md: 20px;
  --container: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.skip-link { position: fixed; top: -80px; left: 16px; z-index: 100; padding: 10px 16px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .9);
  border-bottom: 1px solid rgba(220, 231, 235, .85);
  backdrop-filter: blur(16px);
}
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.brand img { width: 44px; height: 44px; }
.brand-copy { display: grid; line-height: 1.08; }
.brand-name { font-size: 1.06rem; font-weight: 800; letter-spacing: .1em; }
.brand-sub { margin-top: 5px; color: var(--muted); font-size: .68rem; letter-spacing: .08em; }
.main-nav { display: flex; align-items: center; gap: 28px; }
.main-nav a { color: #38515d; font-size: .9rem; font-weight: 700; text-decoration: none; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--sea-700); }
.nav-contact { padding: 10px 18px; color: #fff !important; background: var(--sea-900); border-radius: 999px; }
.mobile-nav { display: none; }

.hero {
  position: relative;
  overflow: hidden;
  min-height: 700px;
  display: grid;
  align-items: center;
  background:
    radial-gradient(circle at 84% 16%, rgba(74, 186, 211, .18), transparent 30%),
    linear-gradient(145deg, #fff 0%, #f5fbfc 58%, #eef8fa 100%);
}
.hero::before, .hero::after { content: ""; position: absolute; border-radius: 50%; pointer-events: none; }
.hero::before { width: 520px; height: 520px; right: -210px; bottom: -170px; border: 90px solid rgba(38, 157, 190, .1); }
.hero::after { width: 190px; height: 190px; right: 20%; top: 70px; background: rgba(240, 163, 111, .12); }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.12fr .88fr; align-items: center; gap: 72px; padding-block: 96px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin: 0 0 22px; color: var(--sea-700); font-size: .75rem; font-weight: 800; letter-spacing: .22em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 34px; height: 2px; background: var(--coral); }
.hero h1 { margin: 0; max-width: 720px; font-size: clamp(2.65rem, 6vw, 5.3rem); line-height: 1.1; letter-spacing: -.045em; }
.hero h1 span { display: block; color: var(--sea-700); }
.hero-lead { max-width: 620px; margin: 28px 0 0; color: var(--muted); font-size: 1.08rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 12px 24px; border: 1px solid var(--sea-900); border-radius: 999px; font-size: .92rem; font-weight: 800; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: var(--sea-900); }
.button-secondary { background: rgba(255, 255, 255, .7); }
.hero-visual { position: relative; min-height: 430px; }
.ocean-card { position: absolute; inset: 35px 0 0 45px; overflow: hidden; border-radius: 56% 44% 46% 54% / 48% 38% 62% 52%; background: linear-gradient(145deg, #2ca9c7, #0b5b89); box-shadow: var(--shadow); }
.ocean-card::before, .ocean-card::after { content: ""; position: absolute; border-radius: 50%; border: 3px solid rgba(255, 255, 255, .35); }
.ocean-card::before { width: 280px; height: 280px; right: -55px; top: -55px; }
.ocean-card::after { width: 150px; height: 150px; left: -30px; bottom: 45px; }
.ocean-word { position: absolute; inset: 0; display: grid; place-items: center; color: rgba(255,255,255,.95); font-size: clamp(3.2rem, 7vw, 5.7rem); font-weight: 900; letter-spacing: -.08em; transform: rotate(-8deg); }
.float-note { position: absolute; right: -8px; bottom: 12px; max-width: 245px; padding: 22px 24px; background: #fff; border-radius: 18px; box-shadow: var(--shadow); }
.float-note strong { display: block; color: var(--sea-700); font-size: .74rem; letter-spacing: .16em; }
.float-note span { display: block; margin-top: 7px; font-weight: 700; line-height: 1.55; }

.intro-strip { border-block: 1px solid var(--line); background: #fff; }
.intro-grid { display: grid; grid-template-columns: repeat(2, 1fr); }
.intro-item { padding: 28px 36px; border-left: 1px solid var(--line); }
.intro-item:last-child { border-right: 1px solid var(--line); }
.intro-item strong { display: block; color: var(--sea-700); font-size: 1.45rem; line-height: 1.2; }
.intro-item span { display: block; margin-top: 4px; color: var(--muted); font-size: .78rem; letter-spacing: .05em; }

.section { padding-block: 112px; }
.section-tint { background: #f5fafb; }
.section-head { display: grid; grid-template-columns: .7fr 1.3fr; gap: 64px; margin-bottom: 56px; }
.section-kicker { margin: 0; color: var(--sea-700); font-size: .75rem; font-weight: 800; letter-spacing: .2em; text-transform: uppercase; }
.section-title { margin: 10px 0 0; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.25; letter-spacing: -.035em; }
.section-copy { margin: 6px 0 0; color: var(--muted); font-size: 1.02rem; }

.service-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.service-card { position: relative; overflow: hidden; display: grid; grid-template-columns: 132px 1fr; gap: 28px; align-items: center; min-height: 286px; padding: 42px; color: inherit; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); text-decoration: none; box-shadow: 0 16px 50px rgba(18, 72, 95, .07); transition: transform .2s ease, box-shadow .2s ease; }
.service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.service-icon { display: grid; place-items: center; width: 132px; height: 132px; padding: 20px; background: #f4f7f8; border-radius: 30px; }
.service-card h3 { margin: 0; font-size: 1.55rem; letter-spacing: -.02em; }
.service-card p { margin: 12px 0 0; color: var(--muted); font-size: .9rem; }
.service-link { display: inline-block; margin-top: 18px; color: var(--sea-700); font-size: .82rem; font-weight: 800; }
.service-badge { display: inline-block; margin-bottom: 10px; color: var(--coral); font-size: .68rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.about-panel { min-height: 420px; padding: 56px; color: #fff; background: var(--sea-900); border-radius: var(--radius-lg); }
.about-panel .section-kicker { color: #8fd8e7; }
.about-panel h2 { margin: 14px 0 24px; font-size: clamp(2rem, 4vw, 3.3rem); line-height: 1.25; }
.about-panel p { color: rgba(255,255,255,.78); }
.about-copy h3 { margin: 0 0 20px; font-size: 1.55rem; }
.about-copy p { color: var(--muted); }
.principles { display: grid; gap: 14px; margin-top: 34px; padding: 0; list-style: none; }
.principles li { display: grid; grid-template-columns: 42px 1fr; gap: 14px; align-items: center; padding: 16px 0; border-top: 1px solid var(--line); font-weight: 700; }
.principles span { display: grid; place-items: center; width: 42px; height: 42px; color: var(--sea-700); background: var(--sea-100); border-radius: 50%; font-size: .78rem; }

.company-table { width: 100%; border-collapse: collapse; }
.company-table th, .company-table td { padding: 22px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.company-table th { width: 180px; color: var(--sea-700); font-size: .78rem; letter-spacing: .08em; }
.company-table td { font-size: .93rem; }

.contact-section { padding: 84px 0; background: var(--sand); }
.contact-card { display: flex; align-items: center; justify-content: space-between; gap: 42px; padding: 54px 64px; background: #fff; border-radius: var(--radius-lg); box-shadow: 0 14px 40px rgba(87, 72, 55, .08); }
.contact-card h2 { margin: 0; font-size: clamp(1.8rem, 4vw, 3rem); }
.contact-card p { margin: 10px 0 0; color: var(--muted); }

.site-footer { padding: 58px 0 32px; color: rgba(255,255,255,.75); background: #102d3b; }
.footer-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 60px; }
.footer-brand .brand { color: #fff; }
.footer-brand .brand-sub { color: rgba(255,255,255,.55); }
.footer-copy { max-width: 520px; margin-top: 22px; font-size: .86rem; }
.footer-nav { display: grid; grid-template-columns: repeat(2, max-content); justify-content: end; gap: 10px 34px; }
.footer-nav a { color: rgba(255,255,255,.78); font-size: .83rem; text-decoration: none; }
.copyright { margin-top: 42px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.12); font-size: .72rem; letter-spacing: .04em; }

.page-hero { padding: 92px 0 72px; background: linear-gradient(145deg, #f8fcfd, #eaf6f8); }
.page-hero h1 { margin: 8px 0 0; font-size: clamp(2.5rem, 6vw, 4.7rem); line-height: 1.15; letter-spacing: -.04em; }
.page-hero p { max-width: 690px; margin: 20px 0 0; color: var(--muted); }
.page-content { padding-block: 86px 120px; }
.content-narrow { width: min(100%, 860px); margin-inline: auto; }
.content-narrow h2 { margin: 58px 0 18px; padding-bottom: 12px; border-bottom: 1px solid var(--line); font-size: 1.65rem; }
.content-narrow h2:first-child { margin-top: 0; }
.content-narrow h3 { margin: 34px 0 12px; font-size: 1.15rem; }
.content-narrow p, .content-narrow li { color: #435c67; font-size: .95rem; }
.content-narrow ul, .content-narrow ol { padding-left: 1.4em; }
.legal-date { color: var(--muted); font-size: .85rem; }
.legal-table { width: 100%; border-collapse: collapse; margin-block: 26px; }
.legal-table th, .legal-table td { padding: 14px; border: 1px solid var(--line); text-align: left; vertical-align: top; font-size: .86rem; }
.legal-table th { background: #f5fafb; }
.mail-card { display: grid; place-items: center; min-height: 300px; padding: 48px; text-align: center; background: #f5fafb; border: 1px solid var(--line); border-radius: var(--radius-lg); }
.mail-card h2 { margin: 0; font-size: clamp(1.7rem, 4vw, 2.8rem); }
.mail-card p { max-width: 600px; margin: 14px auto 28px; color: var(--muted); }
.notice { margin-top: 28px; padding: 18px 20px; color: #4a5f69; background: var(--sand); border-left: 4px solid var(--coral); font-size: .84rem; }

@media (max-width: 900px) {
  .main-nav { display: none; }
  .mobile-nav { display: block; position: relative; }
  .mobile-nav summary { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 50%; cursor: pointer; list-style: none; }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav summary::before { content: "☰"; font-size: 1.2rem; }
  .mobile-nav[open] summary::before { content: "×"; }
  .mobile-nav nav { position: absolute; right: 0; top: 55px; display: grid; width: min(78vw, 300px); padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
  .mobile-nav nav a { padding: 11px 8px; color: var(--ink); font-weight: 700; text-decoration: none; }
  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; padding-block: 76px; }
  .hero-visual { min-height: 360px; width: min(100%, 540px); margin-inline: auto; }
  .section-head, .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .service-card { grid-template-columns: 104px 1fr; padding: 32px; }
  .service-icon { width: 104px; height: 104px; }
  .contact-card { padding: 44px; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .header-inner { min-height: 68px; }
  .brand img { width: 39px; height: 39px; }
  .brand-sub { display: none; }
  .hero-grid { padding-block: 58px 72px; }
  .hero h1 { font-size: clamp(2.45rem, 13vw, 4rem); }
  .hero-lead { font-size: .96rem; }
  .hero-actions { display: grid; }
  .hero-visual { min-height: 300px; }
  .ocean-card { inset: 15px 12px 20px; }
  .float-note { right: 0; bottom: 0; max-width: 210px; padding: 17px 18px; font-size: .82rem; }
  .intro-grid { grid-template-columns: 1fr; }
  .intro-item { padding: 20px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .section { padding-block: 76px; }
  .section-head { margin-bottom: 38px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card { grid-template-columns: 82px 1fr; min-height: auto; gap: 20px; padding: 26px 22px; border-radius: 24px; }
  .service-icon { width: 82px; height: 82px; padding: 12px; border-radius: 20px; }
  .service-card h3 { font-size: 1.25rem; }
  .about-panel { min-height: auto; padding: 36px 28px; }
  .company-table, .company-table tbody, .company-table tr, .company-table th, .company-table td { display: block; width: 100%; }
  .company-table tr { padding: 16px 0; border-bottom: 1px solid var(--line); }
  .company-table th, .company-table td { padding: 3px 0; border: 0; }
  .contact-card { display: grid; padding: 34px 26px; }
  .contact-card .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .footer-nav { justify-content: start; }
  .page-hero { padding: 66px 0 54px; }
  .page-content { padding-block: 60px 86px; }
  .legal-table, .legal-table tbody, .legal-table tr, .legal-table th, .legal-table td { display: block; width: 100%; }
  .legal-table tr { border: 1px solid var(--line); border-bottom: 0; }
  .legal-table tr:last-child { border-bottom: 1px solid var(--line); }
  .legal-table th, .legal-table td { border: 0; }
  .mail-card { min-height: 260px; padding: 34px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}