/* ── Blog Base ── */
* { box-sizing: border-box; }

/* ── Prose (記事本文) ── */
.prose {
  font-size: 16px;
  line-height: 1.85;
  color: #334155;
}

.prose h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0f172a;
  margin-top: 2.5em;
  margin-bottom: 0.8em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid #e2e8f0;
}

.prose h3 {
  font-size: 20px;
  font-weight: 600;
  color: #1e293b;
  margin-top: 2em;
  margin-bottom: 0.6em;
}

.prose h4 {
  font-size: 17px;
  font-weight: 600;
  color: #1e293b;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.prose p {
  margin-bottom: 1.4em;
}

.prose a {
  color: #002652;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  opacity: 0.7;
}

.prose strong {
  font-weight: 600;
  color: #1e293b;
}

.prose ul, .prose ol {
  margin-bottom: 1.4em;
  padding-left: 1.5em;
}

.prose ul { list-style-type: disc; }
.prose ol { list-style-type: decimal; }

.prose li {
  margin-bottom: 0.4em;
}

.prose li > ul, .prose li > ol {
  margin-top: 0.4em;
  margin-bottom: 0;
}

.prose blockquote {
  border-left: 3px solid #002652;
  padding: 0.8em 1.2em;
  margin: 1.4em 0;
  background-color: #f8fafc;
  color: #475569;
  font-style: italic;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875em;
  background-color: #f1f5f9;
  padding: 0.2em 0.4em;
  border-radius: 4px;
  color: #be185d;
}

.prose pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 1.6;
  background-color: #1e293b;
  color: #e2e8f0;
  padding: 1.2em 1.5em;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.4em 0;
}

.prose pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  color: inherit;
  font-size: inherit;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5em 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-size: 14px;
}

.prose th {
  background-color: #f8fafc;
  font-weight: 600;
  text-align: left;
  padding: 0.6em 1em;
  border: 1px solid #e2e8f0;
  color: #1e293b;
}

.prose td {
  padding: 0.6em 1em;
  border: 1px solid #e2e8f0;
}

.prose hr {
  border: none;
  border-top: 1px solid #e2e8f0;
  margin: 2.5em 0;
}

/* ── Blog List ── */
.blog-card {
  display: block;
  padding: 1.75rem 1rem;
  border-bottom: 1px solid #f1f5f9;
  text-decoration: none;
  color: inherit;
  border-radius: 8px;
  transition: background-color 0.15s;
}

.blog-card:first-child {
  border-top: 1px solid #f1f5f9;
}

.blog-card:hover {
  background-color: rgba(248, 250, 252, 0.5);
}

.blog-card h2 {
  font-size: 20px;
  font-weight: 600;
  color: #1e293b;
  margin: 0.5rem 0;
  line-height: 1.4;
}

.blog-card:hover h2 {
  color: #002652;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 13px;
}

.blog-category {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  font-size: 12px;
  font-weight: 600;
  border-radius: 9999px;
  background-color: rgba(0, 38, 82, 0.08);
  color: #002652;
}

.blog-date {
  color: #94a3b8;
}

.blog-description {
  font-size: 14px;
  color: #94a3b8;
  line-height: 1.6;
  margin: 0.5rem 0 0;
}

.blog-tag {
  display: inline-block;
  font-size: 11px;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background-color: #f1f5f9;
  color: #94a3b8;
  margin-right: 0.375rem;
  margin-top: 0.75rem;
}

/* ── Article Header ── */
.article-header {
  margin-bottom: 2.5rem;
}

.article-header h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: #0f172a;
  margin: 1rem 0;
}

.article-header .description {
  font-size: 16px;
  color: #64748b;
  line-height: 1.6;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 14px;
  font-weight: 500;
  color: #002652;
  text-decoration: none;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid #e2e8f0;
}

.article-back:hover {
  opacity: 0.7;
}