:root {
  --ink: #101827;
  --muted: #5f6978;
  --paper: #f5f7f8;
  --white: #ffffff;
  --navy: #0c1728;
  --cyan: #14c8c2;
  --cyan-dark: #057c7c;
  --line: #dce2e7;
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --sans: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
}
a { color: inherit; }
img { max-width: 100%; }
.wrap { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 20; padding: 10px 14px; background: #fff; }
.skip-link:focus { left: 8px; }

.age-note { background: var(--cyan); color: #052426; font-size: .82rem; font-weight: 700; text-align: center; padding: 5px 16px; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(12,23,40,.96); color: #fff; border-bottom: 1px solid rgba(255,255,255,.12); backdrop-filter: blur(12px); }
.header-inner { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { text-decoration: none; display: inline-flex; align-items: center; gap: 12px; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.35); border-radius: 50%; color: var(--cyan); font-family: Georgia, serif; font-size: 1.25rem; }
.brand-text { display: grid; line-height: 1.1; letter-spacing: .15em; font-weight: 800; }
.brand-text small { color: #a8b4c3; letter-spacing: .06em; font-size: .62rem; margin-top: 5px; font-weight: 500; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { text-decoration: none; font-size: .9rem; color: #dce5ee; }
.nav a:hover, .nav a:focus-visible { color: var(--cyan); }
.menu-button { display: none; border: 1px solid rgba(255,255,255,.3); background: none; color: #fff; border-radius: 4px; padding: 8px 10px; font: inherit; }

.eyebrow { margin: 0 0 14px; color: var(--cyan-dark); text-transform: uppercase; letter-spacing: .18em; font-size: .76rem; font-weight: 800; }
.hero { background: var(--navy); color: #fff; min-height: 580px; display: grid; align-items: center; overflow: hidden; }
.hero-grid { padding: 76px 0 82px; display: grid; grid-template-columns: 1.05fr .95fr; gap: 72px; align-items: center; }
.hero .eyebrow { color: var(--cyan); }
.hero h1 { max-width: 680px; margin: 0 0 24px; font-family: var(--serif); font-size: clamp(2.4rem, 5vw, 4.7rem); line-height: 1.17; letter-spacing: .04em; font-weight: 600; }
.hero-copy { max-width: 620px; color: #c9d2dc; font-size: 1.04rem; }
.hero-actions { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 10px 20px; text-decoration: none; border: 1px solid var(--cyan); background: var(--cyan); color: #06282a; font-weight: 800; border-radius: 2px; }
.button.secondary { background: transparent; color: #fff; border-color: #536174; }
.button:hover { filter: brightness(1.07); }
.hero-art { position: relative; min-height: 400px; display: grid; place-items: center; }
.orbit { width: min(380px, 85vw); aspect-ratio: 1; border: 1px solid rgba(255,255,255,.16); border-radius: 50%; display: grid; place-items: center; position: relative; }
.orbit::before, .orbit::after { content: ""; position: absolute; border-radius: 50%; border: 1px solid rgba(20,200,194,.35); }
.orbit::before { inset: 12%; }
.orbit::after { inset: 27%; background: var(--cyan); border: 0; box-shadow: 0 0 70px rgba(20,200,194,.32); }
.issue { position: relative; z-index: 1; display: grid; text-align: center; line-height: 1; color: #06282a; font-family: Georgia, serif; }
.issue strong { font-size: 4rem; }
.issue span { margin-top: 10px; font: 800 .68rem/1 var(--sans); letter-spacing: .2em; }
.orbit-label { position: absolute; padding: 4px 8px; color: #9cabbc; background: var(--navy); font-size: .7rem; letter-spacing: .12em; }
.orbit-label.one { top: 12%; right: -2%; }
.orbit-label.two { bottom: 15%; left: -4%; }

.section { padding: 92px 0; }
.section.white { background: #fff; }
.section.navy { background: var(--navy); color: #fff; }
.section-heading { margin-bottom: 38px; display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.section-heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(1.8rem, 3vw, 2.8rem); line-height: 1.3; letter-spacing: .04em; }
.section-heading p { max-width: 520px; margin: 0; color: var(--muted); }
.section.navy .section-heading p { color: #aeb9c7; }

.feature-grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: 24px; }
.feature-card, .article-card { background: #fff; border: 1px solid var(--line); text-decoration: none; overflow: hidden; transition: transform .2s ease, box-shadow .2s ease; }
.feature-card:hover, .article-card:hover { transform: translateY(-3px); box-shadow: 0 18px 50px rgba(16,24,39,.09); }
.cover { min-height: 270px; position: relative; overflow: hidden; display: grid; place-items: center; background: #17334d; color: #fff; }
.cover::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(120deg, transparent 0 28px, rgba(255,255,255,.07) 28px 29px); }
.cover-number { position: relative; font: 400 clamp(4.5rem, 11vw, 8rem)/1 Georgia, serif; color: var(--cyan); }
.cover.alt { background: #332f44; }
.cover.alt::before { background: radial-gradient(circle at 30% 40%, rgba(20,200,194,.38), transparent 28%), radial-gradient(circle at 76% 65%, rgba(255,255,255,.12), transparent 22%); }
.cover.dark { background: #101827; }
.cover.dark::before { background: linear-gradient(45deg, transparent 46%, rgba(20,200,194,.4) 47% 50%, transparent 51%); background-size: 42px 42px; }
.card-body { padding: 26px 28px 30px; }
.meta { display: flex; gap: 12px; flex-wrap: wrap; color: #6c7787; font-size: .78rem; letter-spacing: .04em; }
.tag { color: var(--cyan-dark); font-weight: 800; }
.card-body h3 { margin: 10px 0 10px; font-family: var(--serif); font-size: 1.42rem; line-height: 1.45; }
.card-body p { margin: 0; color: var(--muted); font-size: .92rem; }
.side-stack { display: grid; gap: 24px; }
.side-stack .cover { min-height: 130px; }
.side-stack .cover-number { font-size: 3.6rem; }
.side-stack .card-body { padding: 20px 22px 23px; }
.side-stack .card-body h3 { font-size: 1.08rem; }

.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.article-card .cover { min-height: 190px; }
.article-card .cover-number { font-size: 4.8rem; }
.text-link { font-weight: 800; text-underline-offset: 4px; color: var(--cyan-dark); }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.15); }
.principle { background: var(--navy); padding: 34px; }
.principle-num { color: var(--cyan); font: 400 2rem/1 Georgia, serif; }
.principle h3 { margin: 20px 0 10px; font-family: var(--serif); font-size: 1.24rem; }
.principle p { margin: 0; color: #aeb9c7; font-size: .92rem; }

.newsletter { display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 44px 0; }
.newsletter h2 { margin: 0 0 8px; font-family: var(--serif); font-size: 1.7rem; }
.newsletter p { margin: 0; color: var(--muted); }

.site-footer { background: #080f1a; color: #afbac8; padding: 54px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; }
.footer-brand { color: #fff; }
.footer-brand p { max-width: 480px; margin: 16px 0 0; font-size: .9rem; }
.footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 30px; }
.footer-links a { color: #ccd5df; text-decoration: none; font-size: .88rem; }
.footer-links a:hover { color: var(--cyan); }
.copyright { margin-top: 40px; padding-top: 22px; border-top: 1px solid #263243; font-size: .78rem; }

.page-hero { background: var(--navy); color: #fff; padding: 70px 0 62px; }
.page-hero h1 { margin: 0 0 14px; font-family: var(--serif); font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1.3; }
.page-hero p { margin: 0; color: #b8c4d1; }
.article-shell { display: grid; grid-template-columns: minmax(0, 760px) 260px; gap: 64px; align-items: start; padding: 72px 0 96px; }
.prose { background: #fff; border: 1px solid var(--line); padding: clamp(28px, 6vw, 64px); }
.prose h2 { margin: 2.4em 0 .7em; padding-bottom: .35em; border-bottom: 1px solid var(--line); font-family: var(--serif); font-size: 1.65rem; line-height: 1.5; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin: 2em 0 .6em; font-size: 1.14rem; }
.prose p, .prose li { color: #364152; }
.prose li + li { margin-top: .55em; }
.prose .notice { background: #edf9f8; border-left: 3px solid var(--cyan-dark); padding: 18px 20px; }
.prose .disclosure { background: #f3f5f7; border: 1px solid var(--line); padding: 18px 20px; font-size: .9rem; }
.sidebar { position: sticky; top: 110px; }
.sidebar-box { border-top: 3px solid var(--cyan); background: #fff; padding: 22px; }
.sidebar-box h2 { margin: 0 0 12px; font-size: 1rem; }
.sidebar-box a { display: block; padding: 9px 0; border-top: 1px solid var(--line); text-decoration: none; font-size: .86rem; line-height: 1.5; }
.sidebar-box a:hover { color: var(--cyan-dark); }
.legal-shell { width: min(820px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0 96px; }
.legal-shell .prose { padding: clamp(28px, 7vw, 64px); }
.update { color: var(--muted); font-size: .86rem; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
.contact-card { background: #f6f8f9; border: 1px solid var(--line); padding: 24px; }
.contact-card h3 { margin-top: 0; }
.checklist { padding: 0; list-style: none; }
.checklist li { padding-left: 30px; position: relative; }
.checklist li::before { content: "✓"; position: absolute; left: 0; color: var(--cyan-dark); font-weight: 900; }

@media (max-width: 860px) {
  .header-inner { height: 66px; }
  .menu-button { display: inline-block; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 66px; padding: 18px 20px 24px; background: var(--navy); border-top: 1px solid #304055; flex-direction: column; align-items: flex-start; gap: 13px; }
  .nav.open { display: flex; }
  .hero-grid, .feature-grid, .footer-grid, .article-shell { grid-template-columns: 1fr; }
  .hero-grid { gap: 12px; padding: 56px 0; }
  .hero-art { min-height: 330px; }
  .side-stack { grid-template-columns: 1fr 1fr; }
  .article-grid { grid-template-columns: 1fr 1fr; }
  .principles { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}

@media (max-width: 580px) {
  .wrap { width: min(100% - 28px, 1120px); }
  .age-note { font-size: .72rem; }
  .brand-text small { display: none; }
  .hero { min-height: auto; }
  .hero-grid { padding: 46px 0 52px; }
  .hero h1 { font-size: 2.45rem; }
  .hero-art { min-height: 270px; }
  .orbit { width: 260px; }
  .issue strong { font-size: 3.1rem; }
  .section { padding: 64px 0; }
  .section-heading { align-items: start; flex-direction: column; }
  .side-stack, .article-grid, .contact-grid { grid-template-columns: 1fr; }
  .newsletter { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; }
  .article-shell { padding: 42px 0 68px; gap: 30px; }
  .page-hero { padding: 50px 0 44px; }
}