:root {
  --ink: #22303a;
  --ink-soft: #5b6b76;
  --steam: #eef4f6;
  --accent: #b0553a;      /* iron-rich spring red */
  --accent-deep: #7e3a26;
  --water: #2a7f8f;
  --border: #d8e2e6;
  --max: 860px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Georgia, "Times New Roman", "Hiragino Mincho ProN", serif;
  color: var(--ink);
  background: #fcfdfd;
  line-height: 1.7;
}
.site-header {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 1rem;
  padding: 1rem 1.5rem; border-bottom: 3px solid var(--accent);
  background: var(--steam);
}
.logo { font-size: 1.5rem; font-weight: 700; color: var(--accent-deep); text-decoration: none; letter-spacing: .12em; }
.logo-sub { display: block; font-size: .65rem; letter-spacing: .2em; color: var(--ink-soft); font-weight: 400; }
.site-header nav { display: flex; flex-wrap: wrap; gap: .9rem; margin-left: auto; }
.site-header nav a { color: var(--water); text-decoration: none; font-size: .9rem; }
.site-header nav a:hover { text-decoration: underline; }
main { max-width: var(--max); margin: 0 auto; padding: 1.5rem; }
.hero { padding: 2.5rem 0 1.5rem; border-bottom: 1px solid var(--border); }
.hero h1 { font-size: 2rem; line-height: 1.3; margin: 0 0 .8rem; }
.hero p { color: var(--ink-soft); max-width: 40rem; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 1rem; }
.card { border: 1px solid var(--border); border-radius: 8px; padding: 1rem; text-decoration: none; color: inherit; background: #fff; }
.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 .4rem; color: var(--accent-deep); }
.card p { margin: 0; font-size: .85rem; color: var(--ink-soft); }
.article-list { list-style: none; padding: 0; }
.article-list li { padding: 1rem 0; border-bottom: 1px solid var(--border); }
.article-list a { font-size: 1.1rem; color: var(--water); text-decoration: none; font-weight: 700; }
.article-list a:hover { text-decoration: underline; }
.article-list p { margin: .3rem 0; color: var(--ink-soft); font-size: .9rem; }
.meta { font-size: .8rem; color: var(--ink-soft); }
.badge { display: inline-block; font-size: .7rem; padding: .1rem .5rem; border-radius: 999px; background: var(--steam); border: 1px solid var(--border); }
.badge-draft { background: #fdf0e7; border-color: var(--accent); color: var(--accent-deep); }
.breadcrumb { font-size: .8rem; color: var(--ink-soft); }
.breadcrumb a { color: var(--water); }
.article h1 { font-size: 1.9rem; line-height: 1.3; }
.article h2 { margin-top: 2.2rem; padding-bottom: .3rem; border-bottom: 2px solid var(--steam); }
.article table { border-collapse: collapse; width: 100%; font-size: .9rem; margin: 1rem 0; }
.article th, .article td { border: 1px solid var(--border); padding: .5rem .7rem; text-align: left; vertical-align: top; }
.article th { background: var(--steam); }
.article img { max-width: 100%; }
.disclosure-box {
  font-size: .8rem; color: var(--ink-soft); background: var(--steam);
  border-left: 4px solid var(--accent); padding: .6rem .9rem; border-radius: 4px; margin: 1rem 0 1.5rem;
}
.site-footer { max-width: var(--max); margin: 2rem auto 0; padding: 1.5rem; border-top: 1px solid var(--border); font-size: .8rem; color: var(--ink-soft); }
.disclosure { font-size: .75rem; }
blockquote { border-left: 3px solid var(--water); margin: 1rem 0; padding: .2rem 1rem; color: var(--ink-soft); }
code { background: var(--steam); padding: .1rem .3rem; border-radius: 3px; font-size: .85em; }