/* /blog/ 一覧 + /blog/post/<slug> の本文スタイル。
 * site.css のトークン (--color-* / --font-*) を継承する。
 * site.css と互換性を取るための軽い alias。 */
:root {
  --color-text-primary: var(--color-text);
  --content-max: 920px;
  --article-max: 720px;
  --color-bg-card: var(--color-card);
}

/* Blog list */
.blog-list {
  max-width: var(--content-max);
  margin: 32px auto;
  padding: 0 16px 60px;
}
.blog-list__header { margin: 16px 0 28px; }
.blog-list__home {
  display: inline-block;
  color: var(--color-text-mid);
  text-decoration: none;
  font-size: 13px;
}
.blog-list__home:hover { color: var(--color-primary); }
.blog-list__header h1 {
  font-size: clamp(24px, 4vw, 32px);
  margin: 10px 0 0;
  font-family: var(--font-en);
  font-weight: 700;
  color: var(--color-primary-deep);
  letter-spacing: 0.02em;
}
.blog-list__items {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 16px;
}
.blog-list__item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.blog-list__item:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(36, 61, 99, 0.08);
  border-color: var(--color-primary-light);
}
.blog-list__link {
  display: flex;
  gap: 20px;
  padding: 18px;
  text-decoration: none;
  color: inherit;
}
.blog-list__cover {
  width: 180px;
  height: 110px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
  background: var(--color-primary-surface);
}
.blog-list__meta { display: flex; flex-direction: column; gap: 8px; flex: 1; min-width: 0; }
.blog-list__title {
  font-size: 18px;
  margin: 0;
  color: var(--color-text-primary);
  line-height: 1.5;
  font-weight: 700;
}
.blog-list__excerpt {
  font-size: 14px;
  color: var(--color-text-mid);
  margin: 0;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.blog-list__time {
  font-size: 12px;
  color: var(--color-text-light);
  font-family: var(--font-en);
  letter-spacing: 0.04em;
}
.blog-list__empty {
  color: var(--color-text-light);
  padding: 60px 0;
  text-align: center;
  font-size: 14px;
}
@media (max-width: 640px) {
  .blog-list__link { flex-direction: column; gap: 12px; padding: 14px; }
  .blog-list__cover { width: 100%; height: 180px; }
}

/* Breadcrumb */
.blog-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12px;
  color: var(--color-text-light);
  margin: 8px 0 16px;
}
.blog-breadcrumb a {
  color: var(--color-text-mid);
  text-decoration: none;
}
.blog-breadcrumb a:hover { color: var(--color-primary); text-decoration: underline; }
.blog-breadcrumb [aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* Related posts */
.blog-related {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}
.blog-related__title {
  font-size: 18px;
  margin: 0 0 16px;
  color: var(--color-primary-deep);
  font-family: var(--font-en), var(--font-jp);
  letter-spacing: 0.02em;
}

/* Article */
.blog-article {
  max-width: var(--article-max);
  margin: 32px auto;
  padding: 0 16px 60px;
}
.blog-article__back {
  display: inline-block;
  color: var(--color-text-mid);
  text-decoration: none;
  font-size: 13px;
  margin-bottom: 8px;
}
.blog-article__back:hover { color: var(--color-primary); }
.blog-article__header { margin: 16px 0 24px; }
.blog-article__title {
  font-size: clamp(26px, 4.5vw, 34px);
  margin: 0 0 12px;
  line-height: 1.4;
  color: var(--color-primary-deep);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.blog-article__time {
  font-size: 13px;
  color: var(--color-text-light);
  font-family: var(--font-en);
  letter-spacing: 0.04em;
}
.blog-article__cover {
  width: 100%;
  height: auto;
  border-radius: 10px;
  margin-bottom: 28px;
}
.blog-article > article {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 28px 32px;
}
@media (max-width: 640px) {
  .blog-article > article { padding: 20px 16px; }
}

/* Prose: sanitized markdown body */
.prose { line-height: 1.95; font-size: 16px; color: var(--color-text-primary); }
.prose h2 {
  font-size: 26px;
  font-weight: 700;
  color: #243D63;
  background: #f5f7fa;
  border-left: 6px solid #3D6196;
  padding: 14px 18px;
  margin: 56px 0 20px;
  line-height: 1.4;
  border-radius: 0 4px 4px 0;
}
.prose h3 {
  font-size: 19px;
  font-weight: 600;
  color: #243D63;
  margin: 32px 0 12px;
  padding-left: 12px;
  border-left: 4px solid #3D6196;
  line-height: 1.5;
}
@media (max-width: 768px) {
  .prose h2 {
    font-size: 22px;
    padding: 12px 14px;
    margin: 40px 0 16px;
    border-left-width: 5px;
  }
  .prose h3 { font-size: 17px; margin: 24px 0 10px; }
}
.prose p { margin: 16px 0; }
.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: rgba(61, 97, 150, 0.4);
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-color: var(--color-primary); }
.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 20px 0;
  border: 1px solid var(--color-border);
}
.prose ul, .prose ol { padding-left: 1.6em; margin: 14px 0; }
.prose li { margin: 6px 0; }
.prose blockquote {
  border-left: 4px solid var(--color-primary-light);
  background: var(--color-primary-surface);
  padding: 12px 16px;
  color: var(--color-text-mid);
  margin: 18px 0;
  border-radius: 0 6px 6px 0;
}
.prose code {
  background: var(--color-primary-surface);
  color: var(--color-primary-deep);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 92%;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}
.prose pre {
  background: #1f2228;
  color: #e6e6e6;
  padding: 16px 18px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.7;
}
.prose pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 28px 0;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
}
.prose th, .prose td {
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  text-align: left;
}
.prose th {
  background: var(--color-primary-surface);
  color: var(--color-primary-deep);
  font-weight: 600;
}

/* TOC (auto-generated table of contents) */
html { scroll-behavior: smooth; }
.prose-toc {
  background: #f5f7fa;
  border: 1px solid #e3e7ee;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 0 0 32px;
}
.prose-toc__title {
  font-weight: 700;
  font-size: 16px;
  color: #243D63;
  margin-bottom: 8px;
}
.prose-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.prose-toc__item a {
  display: inline-block;
  color: #3D6196;
  text-decoration: underline;
  text-decoration-color: rgba(61, 97, 150, 0.4);
  text-underline-offset: 3px;
  font-size: 14px;
  line-height: 1.9;
  padding: 2px 0;
}
.prose-toc__item a:hover {
  text-decoration-color: #3D6196;
  color: #243D63;
}
.prose-toc__item--h2 {
  margin-top: 6px;
  font-weight: 600;
}
.prose-toc__item--h2:first-child {
  margin-top: 0;
}
.prose-toc__item--h3 {
  padding-left: 28px;
  font-size: 13px;
}