/* Foothold — 濃紺 / 生成り / 琥珀 */

:root {
  --navy:    #0e1a26;
  --bg:      #fbfaf7;
  --surface: #ffffff;
  --text:    #16232f;
  --muted:   #5d6e7d;
  --line:    #e5e1d7;
  --accent:  #b8730f;
  --accent-bright: #e6a03c;
  --maxw: 40rem;
  --font-jp: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP",
             system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #0e1a26;
    --surface: #142230;
    --text:    #e9e6dd;
    --muted:   #93a3b2;
    --line:    #24343f;
    --accent:  #e6a03c;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-jp);
  font-size: 17px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.375rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.2em; }

/* ---------- masthead ---------- */

.masthead {
  background: var(--navy);
  color: #f4f1e8;
  border-bottom: 3px solid var(--accent-bright);
}

.masthead-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding-block: 1.125rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: #f4f1e8;
}
.brand:hover { text-decoration: none; }

.mark { width: 30px; height: auto; color: #f4f1e8; flex: none; }

.brand-text { display: flex; flex-direction: column; line-height: 1.25; }

.brand-name {
  font-family: Futura, "Avenir Next", Avenir, "Century Gothic", sans-serif;
  font-size: 1.45rem;
  letter-spacing: 0.07em;
}

.brand-tag {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: #9fb0be;
}

.nav { display: flex; gap: 1.125rem; font-size: 0.84rem; }
.nav a { color: #cfd8de; letter-spacing: 0.06em; }
.nav a:hover { color: #fff; }

/* ---------- hero ---------- */

.hero { padding-block: 3.25rem 2.25rem; }

.hero-title {
  margin: 0 0 1rem;
  font-size: 1.6rem;
  line-height: 1.55;
  letter-spacing: 0.04em;
}

.hero-lead {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.95;
}

/* ---------- index list ---------- */

.list { padding-bottom: 3.5rem; }

.card { border-top: 1px solid var(--line); }
.card:last-child { border-bottom: 1px solid var(--line); }

.card-link {
  display: block;
  padding-block: 1.6rem;
  color: inherit;
}
.card-link:hover { text-decoration: none; }
.card-link:hover .card-title { color: var(--accent); }

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.cat {
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.card-title {
  margin: 0.5rem 0 0.4rem;
  font-size: 1.12rem;
  line-height: 1.65;
  letter-spacing: 0.03em;
  transition: color 0.12s;
}

.card-desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--muted);
}

.empty { color: var(--muted); padding-block: 2rem; }

/* ---------- post ---------- */

.post { padding-block: 2.75rem 4rem; }

.post-title {
  margin: 0.6rem 0 0;
  font-size: 1.55rem;
  line-height: 1.6;
  letter-spacing: 0.03em;
}

.post-head { margin-bottom: 2.5rem; }

.prose > *:first-child { margin-top: 0; }

.prose p { margin: 0 0 1.65em; }

.prose h2 {
  margin: 3.2rem 0 1.2rem;
  padding-left: 0.85rem;
  border-left: 4px solid var(--accent-bright);
  font-size: 1.16rem;
  line-height: 1.6;
  letter-spacing: 0.03em;
}

.prose h3 {
  margin: 2.5rem 0 0.9rem;
  font-size: 1.02rem;
  letter-spacing: 0.03em;
}

.prose ul, .prose ol { margin: 0 0 1.65em; padding-left: 1.4em; }
.prose li { margin-bottom: 0.55em; }

.prose strong {
  font-weight: 700;
  background: linear-gradient(transparent 62%, rgba(230, 160, 60, 0.32) 62%);
}

.prose blockquote {
  margin: 0 0 1.65em;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 2px solid var(--line);
  color: var(--muted);
}

.prose hr {
  margin: 3rem 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.prose code {
  padding: 0.1em 0.35em;
  border-radius: 3px;
  background: rgba(127, 127, 127, 0.14);
  font-size: 0.88em;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}

.prose pre {
  margin: 0 0 1.65em;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: var(--navy);
  color: #e9e6dd;
  border-radius: 6px;
  line-height: 1.75;
}
.prose pre code { background: none; padding: 0; font-size: 0.82rem; }

.prose table {
  width: 100%;
  margin: 0 0 1.65em;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.prose th, .prose td {
  padding: 0.6rem 0.7rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.prose th { color: var(--muted); font-size: 0.78rem; letter-spacing: 0.08em; }

.prose img { max-width: 100%; height: auto; border-radius: 4px; }

.table-scroll { overflow-x: auto; }

/* ---------- 広告表記（ステマ規制対応） ---------- */

.pr-notice {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 2rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
}

.pr-badge {
  flex: none;
  padding: 0.05rem 0.4rem;
  border-radius: 3px;
  background: var(--accent-bright);
  color: #0e1a26;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

/* ---------- 記事末のCTA ---------- */

.cta {
  margin-top: 3.5rem;
  padding: 1.5rem 1.4rem;
  border-left: 4px solid var(--accent-bright);
  background: var(--surface);
  border-radius: 0 5px 5px 0;
}

.cta-lead {
  margin: 0 0 0.6rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.cta-body { margin: 0; font-size: 0.92rem; line-height: 1.9; }

/* ---------- 関連記事 ---------- */

.related { margin-top: 3.5rem; }

.related-head {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-weight: 400;
}

.related-item {
  display: block;
  padding-block: 0.95rem;
  border-top: 1px solid var(--line);
  color: inherit;
}
.related-item:last-child { border-bottom: 1px solid var(--line); }
.related-item:hover { text-decoration: none; }
.related-item:hover .related-title { color: var(--accent); }

.related-date {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.related-title {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.95rem;
  line-height: 1.7;
  transition: color 0.12s;
}

.post-foot {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
}

.back::before { content: "← "; }

/* ---------- footer ---------- */

.foot {
  margin-top: auto;
  padding-block: 2.5rem 3rem;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--muted);
}

.foot-note { margin: 0 0 1.1rem; line-height: 1.85; }

.foot-links { display: flex; flex-wrap: wrap; gap: 1.1rem; margin: 0 0 1.1rem; }

.foot-copy { margin: 0; letter-spacing: 0.08em; }

/* ---------- small screens ---------- */

@media (max-width: 30rem) {
  body { font-size: 16px; }
  .brand-name { font-size: 1.3rem; }
  .hero { padding-block: 2.5rem 1.75rem; }
  .hero-title { font-size: 1.4rem; }
  .post-title { font-size: 1.35rem; }
  .masthead-in { gap: 0.75rem; }
}