:root {
  --ink: #151515;
  --muted: #636363;
  --paper: #fff;
  --soft: #f4f4f2;
  --line: #d5d5d2;
  --focus: #005fcc;
  --content: 1180px;
  --reading: 760px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; font-size: 17px; line-height: 1.9; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
.skip-link { position: fixed; z-index: 100; top: .5rem; left: .5rem; padding: .6rem 1rem; background: var(--ink); color: #fff; transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.site-header { border-bottom: 1px solid var(--ink); background: rgba(255,255,255,.96); }
.header-inner { width: min(calc(100% - 40px), var(--content)); min-height: 78px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { max-width: 75%; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 700; font-size: clamp(1rem, 2vw, 1.28rem); text-decoration: none; letter-spacing: .035em; }
.site-header nav a { font-size: .88rem; font-weight: 700; text-decoration: none; border-bottom: 1px solid currentColor; }
.hero { position: relative; min-height: clamp(480px, 69vw, 760px); overflow: hidden; background: #222; }
.hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 48%; filter: grayscale(22%) contrast(1.04); }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,0,0,.78) 0%, rgba(0,0,0,.48) 52%, rgba(0,0,0,.12) 100%); }
.hero-overlay { position: relative; z-index: 1; width: min(calc(100% - 40px), var(--content)); min-height: inherit; margin: auto; display: flex; flex-direction: column; justify-content: flex-end; align-items: flex-start; padding: clamp(3rem, 9vw, 7rem) 0; color: #fff; }
.eyebrow, .section-mark { margin: 0 0 1rem; font-size: .72rem; font-weight: 800; letter-spacing: .22em; }
.hero h1 { max-width: 16ch; margin: 0; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(2.3rem, 6.2vw, 5.6rem); line-height: 1.22; letter-spacing: .025em; }
.hero-overlay > p:last-child { max-width: 43rem; margin: 1.7rem 0 0; font-size: clamp(1rem, 1.8vw, 1.18rem); }
.intro, .articles-section { width: min(calc(100% - 40px), var(--content)); margin: auto; }
.intro { display: grid; grid-template-columns: minmax(120px, 1fr) minmax(0, 3fr); gap: 3rem; padding: clamp(4.5rem, 9vw, 8rem) 0; border-bottom: 1px solid var(--ink); }
.intro h2, .section-heading h2 { margin: 0 0 1.25rem; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(1.7rem, 3.5vw, 2.8rem); line-height: 1.4; }
.intro p:last-child { max-width: 48rem; margin: 0; }
.articles-section { padding: clamp(4.5rem, 9vw, 8rem) 0; }
.section-heading { display: grid; grid-template-columns: minmax(120px, 1fr) minmax(0, 3fr); gap: 3rem; }
.article-list { border-top: 1px solid var(--ink); }
.article-card { display: grid; grid-template-columns: minmax(90px, 1fr) minmax(0, 3fr); gap: 3rem; padding: 2.7rem 0; border-bottom: 1px solid var(--line); }
.article-number { margin: 0; font-family: Georgia, serif; font-size: 2.1rem; line-height: 1; }
.article-card h2 { max-width: 34ch; margin: 0 0 1rem; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(1.35rem, 2.7vw, 2rem); line-height: 1.5; }
.article-card h2 a { text-decoration: none; }
.article-card p:not(.article-number) { max-width: 47rem; margin: 0 0 1rem; color: #444; }
.read-link { display: inline-block; font-size: .9rem; font-weight: 800; }
.article-page { width: min(calc(100% - 40px), var(--content)); margin: auto; padding-bottom: 5rem; }
.breadcrumbs { padding: 1.3rem 0; font-size: .78rem; color: var(--muted); border-bottom: 1px solid var(--line); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0; padding: 0; list-style: none; }
.breadcrumbs li + li::before { content: "/"; margin-right: .5rem; }
.article-shell { padding-top: clamp(3rem, 7vw, 6rem); }
.article-header, .article-body { width: min(100%, var(--reading)); margin-inline: auto; }
.article-header h1 { margin: 0; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(2rem, 5vw, 3.7rem); line-height: 1.35; letter-spacing: .015em; }
.article-visual { margin: clamp(2.5rem, 6vw, 5rem) 0; }
.article-visual img { width: 100%; aspect-ratio: 16 / 7; object-fit: cover; object-position: center 48%; filter: grayscale(12%); }
.article-body { font-size: 1.02rem; }
.article-body p { margin: 0 0 1.45em; }
.article-body h2 { margin: 3.4em 0 1.15em; padding-top: .7em; border-top: 1px solid var(--ink); font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: clamp(1.45rem, 3.1vw, 2.1rem); line-height: 1.55; }
.article-body a { font-weight: 700; text-decoration-thickness: 2px; }
.post-nav { margin: 5rem auto 0; padding: 2rem 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.post-nav a { text-decoration: none; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 700; line-height: 1.6; }
.post-nav a:last-child { text-align: right; grid-column: 2; }
.post-nav span { display: block; margin-bottom: .3rem; font-family: sans-serif; font-size: .72rem; color: var(--muted); letter-spacing: .12em; }
.back-link { text-align: center; margin: 2rem 0 0; }
.site-footer { background: var(--ink); color: #fff; }
.footer-inner { width: min(calc(100% - 40px), var(--content)); margin: auto; padding: 3.5rem 0; display: flex; justify-content: space-between; align-items: flex-end; gap: 3rem; }
.site-footer h2 { margin: 0 0 1rem; font-size: .78rem; letter-spacing: .15em; }
.footer-links { display: flex; flex-wrap: wrap; gap: .65rem 1.5rem; margin: 0; padding: 0; list-style: none; }
.footer-brand { margin: 0; font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 700; text-align: right; }
.site-footer a { color: #fff; }
.error-page { min-height: 62vh; width: min(calc(100% - 40px), 760px); margin: auto; display: grid; place-content: center; padding: 5rem 0; }
.error-code { margin: 0; font: 700 clamp(4rem, 18vw, 10rem)/1 Georgia, serif; }
.error-page h1 { font-family: "Yu Mincho", "Hiragino Mincho ProN", serif; font-size: 2rem; }
@media (max-width: 720px) {
  body { font-size: 16px; }
  .header-inner { width: min(calc(100% - 28px), var(--content)); min-height: 68px; }
  .brand { max-width: 68%; line-height: 1.45; }
  .hero-overlay, .intro, .articles-section, .article-page, .footer-inner { width: min(calc(100% - 28px), var(--content)); }
  .hero { min-height: 560px; }
  .hero::after { background: linear-gradient(0deg, rgba(0,0,0,.82), rgba(0,0,0,.12)); }
  .hero h1 { max-width: 12ch; }
  .intro, .section-heading, .article-card { grid-template-columns: 1fr; gap: 1rem; }
  .article-number { font-size: 1.25rem; }
  .article-card { padding: 2rem 0; }
  .article-visual { margin-inline: -14px; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav a:last-child { grid-column: 1; text-align: left; }
  .footer-inner { display: block; }
  .footer-brand { margin-top: 2.5rem; text-align: left; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }