:root {
  --bg: #f8f7f4;
  --surface: #ffffff;
  --ink: #1d2733;
  --ink-soft: #4a5563;
  --muted: #7a8390;
  --line: #e3e0d9;
  --navy: #1e3a5f;
  --navy-deep: #152a45;
  --accent: #9a7b4f;
  --accent-soft: #f3ede3;
  --radius: 6px;
  --max: 1080px;
  --read: 720px;
  --serif: "Noto Serif JP", "Yu Mincho", serif;
  --sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.02em;
}
a { color: var(--navy); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: var(--read); }

/* header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 68px; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: baseline; gap: 10px;
  text-decoration: none; color: var(--ink);
}
.brand-name { font-family: var(--serif); font-weight: 700; font-size: 22px; letter-spacing: 0.08em; }
.brand-en { font-size: 11px; color: var(--muted); letter-spacing: 0.18em; text-transform: uppercase; }
.nav { display: flex; gap: 20px; flex-wrap: wrap; }
.nav a { color: var(--ink-soft); text-decoration: none; font-size: 14px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--navy); }

/* hero */
.hero {
  background: var(--navy-deep);
  color: #f2efe8;
  padding: 72px 0 64px;
}
.hero .eyebrow {
  font-size: 12px; letter-spacing: 0.24em; color: #c9b38c; margin: 0 0 14px;
}
.hero h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(26px, 4.4vw, 40px); line-height: 1.5; margin: 0 0 18px;
}
.hero p { max-width: 620px; color: #d5dbe3; margin: 0; }

/* sections */
.section { padding: 56px 0; }
.section-title {
  font-family: var(--serif); font-size: 22px; font-weight: 600;
  margin: 0 0 24px; padding-bottom: 12px; border-bottom: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: baseline;
}
.section-title small { font-family: var(--sans); font-size: 12px; color: var(--muted); letter-spacing: 0.16em; }

.categories { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.category {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 22px 18px;
}
.category h3 { font-family: var(--serif); font-size: 17px; margin: 0 0 6px; color: var(--navy); }
.category p { font-size: 14px; color: var(--ink-soft); margin: 0; line-height: 1.8; }

.article-list { list-style: none; padding: 0; margin: 0; }
.article-list li { border-bottom: 1px solid var(--line); }
.article-list a {
  display: block; padding: 20px 0; text-decoration: none; color: var(--ink);
}
.article-list a:hover .article-title { color: var(--navy); text-decoration: underline; }
.meta { font-size: 12px; color: var(--muted); display: flex; gap: 12px; flex-wrap: wrap; }
.tag {
  display: inline-block; font-size: 11px; color: var(--accent);
  border: 1px solid var(--accent); border-radius: 2px; padding: 0 6px; line-height: 1.7;
}
.article-title { font-family: var(--serif); font-size: 18px; font-weight: 600; margin: 6px 0 4px; line-height: 1.6; }
.article-excerpt { font-size: 14px; color: var(--ink-soft); margin: 0; }
.empty-note { color: var(--muted); font-size: 14px; padding: 16px 0; }

/* page / article */
.page { padding: 48px 0 72px; }
.breadcrumb { font-size: 12px; color: var(--muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--muted); }
.page h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(24px, 3.6vw, 32px); line-height: 1.55; margin: 8px 0 16px;
}
.prose { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(22px, 5vw, 48px); }
.prose h2 {
  font-family: var(--serif); font-size: 21px; font-weight: 600;
  margin: 44px 0 16px; padding: 4px 0 4px 14px; border-left: 4px solid var(--navy);
}
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 17px; margin: 28px 0 10px; color: var(--navy); }
.prose p { margin: 0 0 1.2em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.2em; }
.prose li { margin-bottom: 4px; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 1.4em; font-size: 14px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--accent-soft); font-weight: 600; }
.table-wrap { overflow-x: auto; }

.summary-box {
  background: var(--accent-soft); border-radius: var(--radius);
  padding: 18px 22px; margin: 0 0 32px; font-size: 15px;
}
.summary-box strong { display: block; font-family: var(--serif); color: var(--navy); margin-bottom: 6px; }
.summary-box ul { margin: 0; }
.note {
  border: 1px solid var(--line); border-left: 4px solid var(--accent);
  padding: 14px 18px; font-size: 14px; color: var(--ink-soft); margin: 0 0 1.4em; background: #fdfcfa;
}
.ad-label {
  font-size: 12px; color: var(--muted); border: 1px solid var(--line);
  padding: 6px 12px; border-radius: 4px; display: inline-block; margin-bottom: 20px;
}
.sources { font-size: 14px; }

/* footer */
.site-footer {
  background: var(--navy-deep); color: #b9c2cd; font-size: 13px;
  padding: 40px 0 28px; margin-top: 24px;
}
.site-footer a { color: #dfe4ea; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; color: #fff; }
.footer-top { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-brand { font-family: var(--serif); font-size: 18px; color: #f2efe8; letter-spacing: 0.08em; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.copyright { margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.12); color: #8d98a6; }

@media (max-width: 600px) {
  .hero { padding: 52px 0 44px; }
  .nav { gap: 14px; }
  .site-header .container { padding-top: 10px; padding-bottom: 10px; }
}