:root {
  --ink: #1c1a17;
  --ink-soft: #55524a;
  --paper: #faf7f2;
  --paper-raised: #f2ede4;
  --accent: #3d5a45;
  --accent-soft: #e7ece6;
  --accent-warm: #c96f3a;
  --line: #ddd6ca;
  --link: #2f4a38;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #ece7dd;
    --ink-soft: #b9b2a4;
    --paper: #17150f;
    --paper-raised: #201d16;
    --accent: #8fb89b;
    --accent-soft: #23291f;
    --accent-warm: #e2a06e;
    --line: #34302a;
    --link: #9bc6a8;
  }
}

:root[data-theme="dark"] {
  --ink: #ece7dd;
  --ink-soft: #b9b2a4;
  --paper: #17150f;
  --paper-raised: #201d16;
  --accent: #8fb89b;
  --accent-soft: #23291f;
  --accent-warm: #e2a06e;
  --line: #34302a;
  --link: #9bc6a8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Sans", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: "Zen Kaku Gothic New", "Hiragino Sans", sans-serif;
  font-weight: 700;
  text-wrap: balance;
  line-height: 1.4;
  color: var(--ink);
}

a { color: var(--link); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.label {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

header.site {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
header.site .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  max-width: 900px;
}
header.site .logo {
  font-family: "Zen Kaku Gothic New", sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
}
header.site .logo span { color: var(--accent); }
header.site nav a {
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-decoration: none;
  margin-left: 20px;
}
header.site nav a:hover { color: var(--accent); }

main { max-width: 900px; margin: 0 auto; }

.hero {
  padding: 64px 24px 48px;
  border-bottom: 1px solid var(--line);
}
.hero .wrap { max-width: 900px; }
.hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  max-width: 18ch;
  margin: 14px 0 12px;
}
.hero p {
  max-width: 60ch;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.post-list { max-width: 900px; margin: 0 auto; padding: 8px 24px 60px; }
.post-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 20px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.post-row time {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding-top: 4px;
}
.post-row .cat {
  display: inline-block;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 3px;
  margin-bottom: 8px;
}
.post-row h2 {
  font-size: 1.2rem;
  margin: 0 0 6px;
}
.post-row h2 a { color: var(--ink); text-decoration: none; }
.post-row h2 a:hover { color: var(--accent); }
.post-row p {
  color: var(--ink-soft);
  font-size: 0.94rem;
  margin: 0;
  max-width: 62ch;
}

article.post { padding: 48px 24px 80px; }
article.post .wrap { max-width: 720px; }
article.post .meta {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 18px;
}
article.post h1 { font-size: clamp(1.5rem, 3.6vw, 2.1rem); margin: 6px 0 20px; }
article.post .lead {
  font-size: 1.05rem;
  color: var(--ink-soft);
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin: 0 0 32px;
}
article.post h2 {
  font-size: 1.3rem;
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
article.post h3 { font-size: 1.08rem; margin: 28px 0 12px; }
article.post p { margin: 0 0 18px; max-width: 68ch; }
article.post ul, article.post ol { margin: 0 0 20px; padding-left: 1.4em; }
article.post li { margin-bottom: 8px; max-width: 66ch; }
article.post strong { color: var(--ink); }

.table-wrap { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: 6px; }
table { border-collapse: collapse; width: 100%; font-size: 0.88rem; min-width: 480px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); }
th { font-family: "JetBrains Mono", monospace; font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-soft); background: var(--paper-raised); }
tr:last-child td { border-bottom: none; }
td[data-num], th[data-num] { font-variant-numeric: tabular-nums; text-align: right; }

.callout {
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 20px 22px;
  margin: 28px 0;
  font-size: 0.94rem;
}
.callout .label { display: block; margin-bottom: 8px; }

.cta-box {
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 24px;
  margin: 36px 0;
  text-align: center;
}
.cta-box p { margin: 0 0 14px; color: var(--ink-soft); font-size: 0.92rem; }
.cta-box a.btn {
  display: inline-block;
  background: var(--accent-warm);
  color: #fff8f2;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.94rem;
}

.disclosure {
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

footer.site {
  border-top: 1px solid var(--line);
  padding: 32px 0 60px;
  text-align: center;
}
footer.site p { color: var(--ink-soft); font-size: 0.82rem; margin: 4px 0; }
footer.site a { color: var(--ink-soft); }

@media (max-width: 560px) {
  .post-row { grid-template-columns: 1fr; gap: 6px; }
  .post-row time { padding-top: 0; }
}

.starter-picks {
  padding: 40px 24px 8px;
  border-bottom: 1px solid var(--line);
}
.starter-picks .wrap { max-width: 900px; }
.starter-picks h2 {
  font-size: 1.05rem;
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-weight: 500;
}
.starter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}
.starter-card {
  display: block;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease;
}
.starter-card:hover { border-color: var(--accent); }
.starter-card h3 {
  font-size: 1rem;
  margin: 8px 0 6px;
}
.starter-card p {
  font-size: 0.86rem;
  color: var(--ink-soft);
  margin: 0;
}
@media (max-width: 640px) {
  .starter-grid { grid-template-columns: 1fr; }
}

.cat-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 24px 0 4px;
}
.cat-filter {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.82rem;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
}
.cat-filter:hover { border-color: var(--accent); color: var(--ink); }
.cat-filter.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-soft);
}

.ad-banner {
  text-align: center;
  margin: 20px 0 8px;
}
.ad-banner img { max-width: 100%; height: auto; }