:root {
  --a-bg:        #FBFAF7;
  --a-bg-warm:   #F2EEE3;
  --a-ink:       #1A1A1A;
  --a-ink-soft:  #3A3A3A;
  --a-mute:      #8A8A8A;
  --a-rule:      #E6E2D8;
  --a-accent:    #9C2A1F;

  --a-serif:     "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --a-mono:      ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --a-pad-page:    80px;
  --a-pad-page-sm: 24px;
  --a-row-pad:     26px;

  --a-h1: 40px; --a-h2: 24px; --a-h3: 22px;
  --a-body: 16px; --a-small: 13px; --a-caption: 11px;
  --a-leading: 2.05;
  --a-tracking-jp: 0.04em;
}

@media (prefers-color-scheme: dark) {
  :root {
    --a-bg:       #171511;
    --a-bg-warm:  #1F1C16;
    --a-ink:      #EFEBDF;
    --a-ink-soft: #C8C2B3;
    --a-mute:     #8A8478;
    --a-rule:     #2A2620;
  }
}

html, body { background: var(--a-bg); color: var(--a-ink); }
body { font-family: var(--a-serif); font-size: var(--a-body); line-height: var(--a-leading); }

a { color: inherit; text-decoration: none; transition: color .15s; }
a:hover { color: var(--a-accent); }

h1 { font-size: var(--a-h1); font-weight: 500; letter-spacing: 0.01em; line-height: 1.4; }
h2 { font-size: var(--a-h2); font-weight: 500;
     border-left: 3px solid var(--a-accent); padding-left: 14px;
     margin: 40px 0 14px; }
h3 { font-size: var(--a-h3); font-weight: 500; line-height: 1.5; }

time, .tag, code, pre { font-family: var(--a-mono); }

pre {
  background: var(--a-bg-warm);
  border-left: 2px solid var(--a-ink);
  padding: 18px 22px;
  font-size: 13px; line-height: 1.85;
  overflow: auto;
}
code { background: var(--a-bg-warm); padding: 1px 6px; font-size: 0.9em; }
pre code { background: none; padding: 0; font-size: inherit; }

hr, .rule { border: 0; border-top: 1px solid var(--a-rule); }

img { max-width: 100%; height: auto; }

.mono { font-family: var(--a-mono); }
/* ─── Site Header ─── */
.site-header {
  padding: 32px var(--a-pad-page) 24px;
  border-bottom: 1px solid var(--a-ink);
  display: flex; justify-content: space-between; align-items: flex-end;
}
.site-header .brand { text-decoration: none; }
.site-header .brand small {
  display: block;
  font-family: var(--a-mono); font-size: 11px;
  letter-spacing: 0.3em; text-transform: uppercase; color: var(--a-mute);
}
.site-header h1 {
  font-size: 34px; letter-spacing: var(--a-tracking-jp); margin: 8px 0 0;
  border: none; /* reset base h1/h2 */
}
.site-header nav { display: flex; gap: 28px; font-size: 13px; }

/* ─── List Header (tags / archives) ─── */
.list-header {
  padding: 40px var(--a-pad-page) 24px;
  border-bottom: 1px solid var(--a-rule);
}
.list-header h1 { font-size: var(--a-h2); margin: 0; }

/* ─── Featured Post ─── */
.featured {
  display: grid; grid-template-columns: 140px 1fr; gap: 64px;
  padding: 56px var(--a-pad-page) 28px; border-bottom: 1px solid var(--a-rule);
}
.featured .meta { display: flex; flex-direction: column; gap: 8px; }
.featured .kicker {
  font-family: var(--a-mono); font-size: 11px;
  letter-spacing: 0.25em; color: var(--a-accent);
}
.featured h2 {
  font-size: 44px; line-height: 1.4; margin: 0 0 18px;
  border-left: none; padding-left: 0; /* reset base h2 */
}
.featured p { font-size: 15px; line-height: 2; color: var(--a-ink-soft); max-width: 720px; }

/* ─── Post List ─── */
.post-list { padding: 8px var(--a-pad-page) 16px; }

.post-row {
  display: grid; grid-template-columns: 140px 1fr 120px; gap: 64px;
  padding: var(--a-row-pad) 0; border-bottom: 1px solid var(--a-rule);
  align-items: baseline;
  color: inherit; text-decoration: none; /* <a> reset */
}
.post-row:hover { background: var(--a-bg-warm); }
.post-row:hover .post-title { color: var(--a-accent); }
.post-row time { font-family: var(--a-mono); color: var(--a-mute); font-size: var(--a-small); }
.post-row .tag { font-family: var(--a-mono); color: var(--a-accent); text-align: right; font-size: var(--a-small); }

/* ─── Tag Pills (featured) ─── */
.tag-pill {
  display: inline-block; padding: 3px 10px;
  border: 1px solid var(--a-accent); color: var(--a-accent);
  font-family: var(--a-mono); font-size: 11px;
  margin-right: 6px; margin-top: 12px;
}
.tag-pill:hover { background: var(--a-accent); color: var(--a-bg); }

/* ─── Pagination ─── */
.pagination-nav {
  display: flex; align-items: center;
  padding: 20px var(--a-pad-page);
  border-top: 1px solid var(--a-rule);
  font-family: var(--a-mono); font-size: var(--a-small);
}
.pagination-nav a { color: var(--a-ink-soft); }
.pagination-nav a:hover { color: var(--a-accent); }
.pagination-nav .disabled { color: var(--a-mute); pointer-events: none; }

/* ─── Article (Single) ─── */
.article { max-width: 720px; margin: 0 auto; padding: 64px 24px; }
.article .kicker {
  font-family: var(--a-mono); font-size: 11px;
  letter-spacing: 0.25em; color: var(--a-accent); margin-bottom: 18px;
}
.article .kicker .dot { margin: 0 6px; }
.article h1 { font-size: 40px; line-height: 1.4; margin: 0 0 28px; }
.article .byline {
  display: flex; gap: 14px; align-items: center;
  margin-bottom: 36px; padding-bottom: 24px; border-bottom: 1px solid var(--a-rule);
}
.article .avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--a-ink); color: var(--a-bg);
  display: flex; align-items: center; justify-content: center; font-size: 14px;
  flex-shrink: 0;
}
.article .byline .name { font-weight: 500; font-size: var(--a-small); }
.article .byline .read { font-family: var(--a-mono); font-size: var(--a-caption); color: var(--a-mute); }

.article .prose p { font-size: 16px; line-height: var(--a-leading); margin: 0 0 18px; text-indent: 1em; }
.article .prose p:first-child { font-size: 17px; }
.article .prose blockquote {
  border-left: 3px solid var(--a-accent);
  padding: 4px 0 4px 16px; color: var(--a-ink-soft); margin: 24px 0;
}
.article .prose ul, .article .prose ol { padding-left: 1.5em; margin: 0 0 18px; }
.article .prose li { line-height: var(--a-leading); }

.adsense-container { margin: 40px 0; }

/* ─── Prev/Next ─── */
.prev-next {
  margin-top: 64px; padding-top: 28px;
  border-top: 1px solid var(--a-ink);
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
}
.prev-next .next { text-align: right; }
.prev-next small {
  display: block; font-family: var(--a-mono);
  font-size: 11px; color: var(--a-mute); margin-bottom: 6px;
}
.prev-next strong { display: block; font-weight: 500; line-height: 1.5; }
.prev-next a:hover strong { color: var(--a-accent); }

/* ─── Site Footer ─── */
.site-footer {
  padding: 28px var(--a-pad-page);
  border-top: 1px solid var(--a-ink); background: var(--a-bg-warm);
  display: flex; justify-content: space-between; align-items: center;
}
.site-footer .who { display: flex; gap: 14px; align-items: center; }
.site-footer .avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--a-ink); color: var(--a-bg);
  display: flex; align-items: center; justify-content: center; font-size: 14px;
  flex-shrink: 0;
}
.site-footer .meta { font-family: var(--a-mono); font-size: var(--a-small); color: var(--a-mute); }
.site-footer .meta a { color: var(--a-mute); }
.site-footer .meta a:hover { color: var(--a-accent); }

/* ─── Mobile ─── */
@media (max-width: 720px) {
  :root { --a-pad-page: var(--a-pad-page-sm); }
  .site-header { flex-direction: column; align-items: flex-start; gap: 16px; }
  .featured { grid-template-columns: 1fr; gap: 12px; }
  .featured h2 { font-size: 28px; }
  .post-row { grid-template-columns: 1fr; gap: 4px; }
  .post-row .tag { text-align: left; }
  .article h1 { font-size: 28px; }
  .prev-next { grid-template-columns: 1fr; gap: 16px; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: 16px; }
}