@import url("https://fonts.googleapis.com/css2?family=Shippori+Mincho+B1:wght@500;700;800&family=Zen+Kaku+Gothic+New:wght@400;500;700;900&display=swap");

:root {
  --ink: #17140f;
  --paper: #f4eee1;
  --paper-deep: #eae2d0;
  --card: #fffdf7;
  --vermilion: #d8391d;
  --vermilion-soft: #fbe1d8;
  --moss: #2d5a4c;
  --moss-soft: #dfeadf;
  --mustard: #f1c24a;
  --muted: #62594b;
  --serif: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", serif;
  --sans: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --content-width: 1200px;
  --hard: 6px 6px 0 var(--ink);
  --hard-lg: 12px 12px 0 var(--ink);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 160px; }
body {
  margin: 0; color: var(--ink); background: var(--paper);
  background-image: radial-gradient(rgba(23,20,15,.07) 1px, transparent 1px);
  background-size: 22px 22px;
  font-family: var(--sans); font-size: 1.02rem; line-height: 2; overflow-wrap: anywhere;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-color: var(--vermilion); text-underline-offset: 4px; text-decoration-thickness: 2px; }
a:hover { color: var(--vermilion); }
button { font: inherit; }
:focus-visible { outline: 3px solid var(--vermilion); outline-offset: 3px; }
.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; padding: 10px 16px; color: #fff; background: var(--ink); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.container { width: min(calc(100% - 80px), var(--content-width)); margin-inline: auto; }

/* ===== Header: two tiers (brand row / full-width nav row) ===== */
.site-header { position: sticky; z-index: 30; top: 0; background: var(--paper); border-bottom: 3px solid var(--ink); }
.header-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; padding-top: 16px; }
.brand { display: inline-flex; align-items: center; gap: 14px; color: var(--ink); text-decoration: none; font-family: var(--serif); font-size: 1.2rem; font-weight: 800; letter-spacing: .05em; line-height: 1.4; }
.brand:hover { color: var(--ink); }
.brand img { width: 46px; height: 46px; }
.brand small { display: block; margin-top: 2px; color: var(--vermilion); font-family: var(--sans); font-size: .66rem; font-weight: 900; letter-spacing: .24em; line-height: 1.3; }
.site-nav { grid-column: 1 / -1; margin-top: 14px; border-top: 3px solid var(--ink); }
.nav-list { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; margin: 0; padding: 0; list-style: none; }
.nav-list li + li { border-left: 2px solid var(--ink); }
.nav-list a { display: block; padding: 9px 8px; text-align: center; font-size: .86rem; font-weight: 700; line-height: 1.7; text-decoration: none; }
.nav-list a:hover, .nav-list a[aria-current="page"] { color: var(--paper); background: var(--ink); }
.menu-button { display: none; width: 46px; height: 46px; border: 2px solid var(--ink); color: var(--ink); background: var(--mustard); box-shadow: 3px 3px 0 var(--ink); cursor: pointer; font-size: 1.2rem; line-height: 1; }

/* ===== Home hero: giant title + intro column, wide banner below ===== */
.hero { position: relative; overflow: hidden; padding: 64px 0 0; background: var(--mustard); border-bottom: 3px solid var(--ink); }
.hero::before { content: ""; position: absolute; right: -90px; top: -150px; width: 420px; height: 420px; border-radius: 50%; background: var(--vermilion); }
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px 64px; align-items: end; }
.eyebrow { display: inline-block; margin: 0 0 22px; padding: 3px 12px; color: var(--paper); background: var(--ink); font-size: .74rem; font-weight: 900; letter-spacing: .22em; text-transform: uppercase; line-height: 1.8; }
.hero h1 { max-width: 680px; margin: 0; font-family: var(--serif); font-size: clamp(2.5rem, 5vw, 4.8rem); font-weight: 800; line-height: 1.3; letter-spacing: .02em; }
.hero-detail { padding-bottom: 6px; }
.hero-lead { margin: 0 0 28px; padding-left: 18px; border-left: 4px solid var(--ink); font-size: .98rem; font-weight: 500; }
.hero-image { grid-column: 1 / -1; margin: 14px 0 0; border: 3px solid var(--ink); border-bottom: 0; background: var(--card); }
.hero-image img { width: 100%; aspect-ratio: 3.2; object-fit: cover; object-position: center 55%; }
.button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; padding: 10px 26px; border: 3px solid var(--ink); color: var(--paper); background: var(--ink); box-shadow: 5px 5px 0 var(--vermilion); font-weight: 900; letter-spacing: .04em; text-decoration: none; transition: transform .15s, box-shadow .15s; }
.button:hover { color: var(--paper); background: var(--ink); transform: translate(3px, 3px); box-shadow: 2px 2px 0 var(--vermilion); }
.button-secondary { color: var(--ink); background: var(--card); box-shadow: 5px 5px 0 var(--moss); }
.button-secondary:hover { color: var(--ink); background: var(--card); box-shadow: 2px 2px 0 var(--moss); }

/* ===== Sections ===== */
.section { padding-block: 96px; }
.section-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 72px; align-items: end; margin-bottom: 44px; }
.section-heading .eyebrow { grid-column: 1 / -1; justify-self: start; color: var(--ink); background: var(--mustard); margin-bottom: 14px; }
.section-heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(1.8rem, 3vw, 2.7rem); font-weight: 800; line-height: 1.45; }
.section-heading > p:last-child { margin: 0; padding-bottom: 4px; color: var(--muted); font-size: .95rem; }

/* Article list: vertical rows  [number | thumbnail | text] */
.article-grid { display: flex; flex-direction: column; gap: 30px; }
.article-card { display: grid; grid-template-columns: 96px 330px 1fr; align-items: stretch; border: 3px solid var(--ink); background: var(--card); box-shadow: var(--hard); transition: transform .18s, box-shadow .18s; }
.article-card:hover { transform: translate(-3px, -3px); box-shadow: 9px 9px 0 var(--ink); }
.article-card::before { content: attr(data-number); display: grid; place-items: center; color: var(--paper); background: var(--vermilion); border-right: 3px solid var(--ink); font-family: var(--serif); font-size: 2.3rem; font-weight: 800; line-height: 1; }
.article-card:nth-child(2)::before { background: var(--moss); }
.article-card:nth-child(3)::before { background: var(--ink); }
.article-card:nth-child(4)::before { background: var(--mustard); color: var(--ink); }
.article-card:nth-child(5)::before { background: var(--paper-deep); color: var(--ink); }
.card-visual { margin: 0; overflow: hidden; border-right: 3px solid var(--ink); background: var(--paper-deep); }
.card-visual img { width: 100%; height: 100%; min-height: 200px; object-fit: cover; transition: transform .35s; }
.article-card:hover .card-visual img { transform: scale(1.05); }
.card-content { display: flex; flex-direction: column; align-items: flex-start; padding: 28px 34px; }
.tag { display: inline-block; padding: 1px 12px; border: 2px solid var(--ink); background: var(--paper-deep); font-size: .74rem; font-weight: 900; letter-spacing: .06em; line-height: 1.9; }
.article-card h3 { margin: 14px 0 8px; font-family: var(--serif); font-size: clamp(1.35rem, 2.1vw, 1.75rem); font-weight: 800; line-height: 1.5; }
.article-card p { max-width: 620px; margin: 0 0 16px; color: var(--muted); font-size: .94rem; line-height: 1.9; }
.text-link { margin-top: auto; padding-bottom: 2px; border-bottom: 3px solid var(--vermilion); font-size: .88rem; font-weight: 900; text-decoration: none; }
.text-link:hover { color: var(--vermilion); }

/* Principles strip: heading on top, 3 columns with icons */
.guide-strip { color: var(--paper); background: var(--ink); }
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.guide-grid h2 { grid-column: 1 / -1; margin: 0 0 8px; color: var(--mustard); font-family: var(--serif); font-size: 2rem; font-weight: 800; line-height: 1.6; }
.guide-grid h2 br { display: none; }
.guide-item { padding: 24px 26px; border: 2px solid rgba(244,238,225,.5); }
.guide-item img { width: 46px; height: 46px; margin-bottom: 16px; }
.guide-item strong { display: block; margin-bottom: 8px; color: var(--mustard); font-family: var(--serif); font-size: 1.2rem; }
.guide-item p { margin: 0; color: #e4dcc8; font-size: .92rem; line-height: 1.85; }

.notice { display: grid; grid-template-columns: 150px 1fr; gap: 28px; margin: 0; padding: 24px 28px; border: 3px solid var(--ink); border-left: 14px solid var(--vermilion); background: var(--vermilion-soft); box-shadow: 5px 5px 0 var(--ink); }
.notice strong { color: var(--vermilion); font-family: var(--serif); font-size: 1.1rem; font-weight: 800; letter-spacing: .08em; }
.notice p { margin: 0; font-size: .93rem; }

/* ===== Article cover: copy left, illustration right ===== */
.page-hero { padding: 26px 0 0; background: var(--mustard); background-image: repeating-linear-gradient(135deg, rgba(23,20,15,.07) 0 2px, transparent 2px 14px); border-bottom: 3px solid var(--ink); }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-block: 0 34px; padding: 0; list-style: none; font-size: .8rem; font-weight: 700; }
.page-hero-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; padding-bottom: 60px; }
.page-hero h1 { margin: 0; font-family: var(--serif); font-size: clamp(1.8rem, 3.1vw, 2.7rem); font-weight: 800; line-height: 1.55; }
.page-hero .eyebrow { margin-bottom: 20px; }
.page-hero .lead { margin: 22px 0; font-size: .96rem; font-weight: 500; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; }
.meta span { padding: 1px 12px; border: 2px solid var(--ink); background: var(--card); font-size: .76rem; font-weight: 700; }
.featured-image { margin: 0; border: 3px solid var(--ink); background: var(--card); box-shadow: var(--hard-lg); transform: rotate(1.2deg); }
.featured-image img { width: 100%; aspect-ratio: 1.35; object-fit: cover; }

/* ===== Reading layout: index left, body right ===== */
.article-layout { width: min(calc(100% - 80px), var(--content-width)); margin: 0 auto; display: grid; grid-template-columns: 250px minmax(0, 780px); gap: 64px; justify-content: space-between; align-items: start; padding: 64px 0 100px; }
.article-body { min-width: 0; font-size: 1rem; line-height: 2.1; }
.article-body p { margin: 0 0 1.6em; }
.toc { position: sticky; top: 176px; border: 3px solid var(--ink); background: var(--card); box-shadow: var(--hard); }
.toc strong { display: block; padding: 8px 20px; color: var(--paper); background: var(--ink); font-family: var(--serif); letter-spacing: .06em; }
.toc ol { counter-reset: toc; margin: 0; padding: 6px 0; list-style: none; }
.toc li { counter-increment: toc; margin: 0; }
.toc li + li { border-top: 1px dashed var(--ink); }
.toc a { display: flex; gap: 12px; padding: 10px 20px; font-size: .84rem; font-weight: 500; line-height: 1.6; text-decoration: none; }
.toc a::before { content: counter(toc, decimal-leading-zero); color: var(--vermilion); font-family: var(--serif); font-size: 1rem; font-weight: 800; line-height: 1.5; }
.toc a:hover { background: var(--paper-deep); color: var(--ink); }
.toc a.is-active { color: var(--paper); background: var(--vermilion); font-weight: 900; }
.toc a.is-active::before { color: var(--mustard); }

.article-body > .notice { display: block; margin-bottom: 8px; padding: 22px 26px; border-left-width: 14px; font-size: .92rem; }
.article-body > .notice strong { display: block; margin-bottom: 6px; }

.article-body h2 { display: flex; flex-direction: column; margin: 76px 0 26px; padding: 20px 0 0; border-top: 3px solid var(--ink); font-family: var(--serif); font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 800; line-height: 1.6; }
.heading-mark { order: -1; display: block; width: 44px; height: 10px; margin-bottom: 14px; background: var(--vermilion); border: 2px solid var(--ink); }
.article-body h3 { margin: 42px 0 14px; padding-bottom: 6px; border-bottom: 3px double var(--ink); font-family: var(--serif); font-size: 1.28rem; font-weight: 800; line-height: 1.6; }
.article-body strong { background: linear-gradient(transparent 62%, rgba(241,194,74,.75) 62%); font-weight: 900; }
.article-body > .notice strong { background: none; }
.article-body ul, .article-body ol { padding-left: 1.5em; }
.article-body li { margin-bottom: .7em; }
.article-body li::marker { color: var(--vermilion); font-weight: 900; }

.summary-box, .review-box, .check-box { margin: 34px 0; padding: 28px 30px; border: 3px solid var(--ink); background: var(--card); box-shadow: var(--hard); }
.summary-box { background: var(--paper-deep); }
.check-box { background: var(--moss-soft); }
.review-box.good { background: var(--moss-soft); box-shadow: 6px 6px 0 var(--moss); }
.review-box.caution { background: var(--vermilion-soft); box-shadow: 6px 6px 0 var(--vermilion); }
.review-label { display: inline-block; margin-bottom: 14px; padding: 1px 12px; border: 2px solid var(--ink); color: var(--paper); font-size: .8rem; font-weight: 900; letter-spacing: .12em; }
.good .review-label { background: var(--moss); }
.caution .review-label { background: var(--vermilion); }
.review-box blockquote { margin: 0; font-family: var(--serif); font-size: 1.12rem; font-weight: 700; line-height: 1.9; }
.review-note { padding: 18px 20px; border: 2px dashed var(--ink); color: var(--muted); font-size: .88rem; }
.article-nav { display: flex; justify-content: space-between; gap: 16px; margin-top: 70px; padding-top: 34px; border-top: 3px solid var(--ink); }

/* ===== Footer ===== */
.site-footer { padding: 56px 0 26px; color: #e4dcc8; background: var(--ink); }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 40px; }
.footer-brand { max-width: 480px; }
.footer-brand .brand { color: var(--paper); font-size: 1.05rem; }
.footer-brand .brand:hover { color: var(--mustard); }
.footer-brand p { margin: 18px 0 0; color: #b9b09b; font-size: .88rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 26px; align-items: start; padding-top: 12px; }
.footer-links a { color: var(--paper); font-size: .9rem; font-weight: 700; text-decoration-color: var(--mustard); }
.footer-links a:hover { color: var(--mustard); }
.copyright { margin: 40px 0 0; padding-top: 22px; border-top: 2px dashed rgba(244,238,225,.3); color: #968d79; font-size: .76rem; }

/* ===== Back to top ===== */
.back-to-top { position: fixed; z-index: 40; right: max(20px, env(safe-area-inset-right)); bottom: max(20px, env(safe-area-inset-bottom)); min-height: 56px; display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px; border: 3px solid var(--ink); color: var(--ink); background: var(--mustard); box-shadow: 5px 5px 0 var(--ink); cursor: pointer; font-size: .9rem; font-weight: 900; line-height: 1.2; opacity: 0; pointer-events: none; transform: translateY(14px); transition: opacity .2s, transform .2s; }
.back-to-top span:first-child { display: grid; width: 24px; height: 24px; place-items: center; color: var(--paper); background: var(--ink); line-height: 1; }
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }
.back-to-top:hover { color: var(--paper); background: var(--vermilion); }

/* ===== Responsive ===== */
@media (max-width: 1050px) {
  .container, .article-layout { width: calc(100% - 56px); }
  .article-card { grid-template-columns: 72px 240px 1fr; }
  .card-content { padding: 24px 24px; }
  .article-layout { grid-template-columns: 210px minmax(0, 1fr); gap: 36px; }
  .page-hero-grid { gap: 36px; }
}
@media (max-width: 760px) {
  html { scroll-padding-top: 96px; }
  .container, .article-layout { width: calc(100% - 36px); }
  .header-inner { position: relative; padding: 14px 0; }
  .brand { font-size: .95rem; gap: 10px; }
  .brand img { width: 38px; height: 38px; }
  .brand small { display: none; }
  .menu-button { display: block; }
  .site-nav { display: none; position: absolute; top: 100%; left: -18px; right: -18px; margin: 0; padding: 10px 18px 14px; background: var(--paper); border-top: 3px solid var(--ink); border-bottom: 3px solid var(--ink); }
  .site-nav.is-open { display: block; }
  .nav-list { grid-auto-flow: row; grid-template-columns: 1fr 1fr; gap: 8px; }
  .nav-list li:last-child:nth-child(odd) { grid-column: 1 / -1; }
  .nav-list li + li { border-left: 0; }
  .nav-list a { border: 2px solid var(--ink); background: var(--card); }
  .hero { padding-top: 40px; }
  .hero::before { width: 260px; height: 260px; right: -110px; top: -120px; }
  .hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .hero h1 { font-size: clamp(2.2rem, 9vw, 3rem); }
  .hero-image { margin-top: 10px; }
  .hero-image img { aspect-ratio: 1.8; }
  .section { padding-block: 60px; }
  .section-heading { grid-template-columns: 1fr; gap: 14px; margin-bottom: 30px; }
  .article-card { grid-template-columns: 1fr; }
  .article-card::before { grid-row: 1; justify-content: start; padding: 8px 18px; border-right: 0; border-bottom: 3px solid var(--ink); font-size: 1.5rem; }
  .card-visual { border-right: 0; border-bottom: 3px solid var(--ink); }
  .card-visual img { min-height: 0; aspect-ratio: 1.8; }
  .card-content { padding: 22px 20px 24px; }
  .guide-grid { grid-template-columns: 1fr; gap: 18px; }
  .guide-grid h2 { font-size: 1.6rem; }
  .guide-item { display: grid; grid-template-columns: 46px 1fr; gap: 6px 16px; padding: 20px; }
  .guide-item img { grid-row: 1 / 3; margin: 0; }
  .guide-item p { grid-column: 2; }
  .notice { grid-template-columns: 1fr; gap: 8px; padding: 20px; }
  .page-hero-grid { grid-template-columns: 1fr; gap: 32px; padding-bottom: 40px; }
  .breadcrumbs { margin-bottom: 24px; }
  .featured-image { box-shadow: 7px 7px 0 var(--ink); }
  .article-layout { display: flex; flex-direction: column; gap: 30px; padding: 36px 0 60px; }
  .toc { position: static; width: 100%; }
  .toc ol { display: grid; grid-template-columns: 1fr 1fr; }
  .toc a { padding: 9px 14px; font-size: .78rem; gap: 8px; }
  .article-body { width: 100%; font-size: .96rem; }
  .article-body h2 { margin-top: 52px; }
  .summary-box, .review-box, .check-box { padding: 22px 20px; }
  .article-nav { flex-wrap: wrap; }
  .footer-inner { grid-template-columns: 1fr; gap: 10px; }
  .footer-links { padding-top: 0; }
  .back-to-top { right: 12px; bottom: 12px; min-width: 52px; padding: 12px; justify-content: center; }
  .back-to-top span:last-child { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
}
@media (max-width: 380px) { .toc ol { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }

.hero h1, .page-hero h1, .section-heading h2, .article-card h3, .article-body h2, .article-body h3, .guide-grid h2 { word-break: auto-phrase; text-wrap: balance; }