/* ============================================================
   BLOG.CSS - ブログ・コラム 共通スタイル
   archive.php / single.php で読み込む
   ============================================================ */

/* ---------- page-common.css の変数を継承 ---------- */
/* :root 変数は front-page.css で定義済み */

/* ============================================================
   ARCHIVE - 記事一覧
   ============================================================ */

/* カテゴリフィルター */
.blog-cat-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.cat-btn {
  display: inline-block;
  padding: 6px 18px;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 500;
  color: var(--text-light);
  text-decoration: none;
  transition: all .2s;
}

.cat-btn:hover,
.cat-btn.active {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--white);
}

/* 記事グリッド */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 56px;
}

.blog-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 960px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .blog-grid,
  .blog-grid--3 { grid-template-columns: 1fr; }
}

/* 記事カード */
.blog-card {
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.blog-card-thumb-link { display: block; }

.blog-card-thumb {
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  background-size: cover;
  background-position: center;
  background-color: var(--bg-light);
}

.blog-card-thumb--noimg {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 0;
  height: 180px;
}

.blog-noimg-label {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: rgba(255,255,255,.4);
  letter-spacing: .1em;
}

.blog-card-body {
  padding: 20px 22px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-card-cat {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  color: var(--blue);
  background: rgba(100,149,237,.1);
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.blog-card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.6;
  margin-bottom: 10px;
}

.blog-card-title a {
  color: var(--text);
  text-decoration: none;
  transition: color .2s;
}

.blog-card-title a:hover { color: var(--blue); }

.blog-card-excerpt {
  font-size: .875rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 14px;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
}

.blog-card-date {
  font-size: .8rem;
  color: var(--text-light);
  font-family: 'Montserrat', sans-serif;
}

.blog-card-link {
  font-size: .85rem;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
  transition: opacity .2s;
}

.blog-card-link:hover { opacity: .7; }

/* ページネーション */
.blog-pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.blog-pagination .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .9rem;
  color: var(--text);
  text-decoration: none;
  transition: all .2s;
}

.blog-pagination .page-numbers:hover,
.blog-pagination .page-numbers.current {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--white);
}

.blog-pagination .prev,
.blog-pagination .next {
  width: auto;
  padding: 0 16px;
  font-size: .85rem;
}

/* 記事なし */
.blog-empty {
  text-align: center;
  padding: 80px 0;
  color: var(--text-light);
  font-size: 1rem;
}

/* ============================================================
   SINGLE - 記事詳細
   ============================================================ */

/* パンくず */
.breadcrumb-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  margin-top: 72px; /* header height */
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  font-size: .82rem;
  color: var(--text-light);
}

.breadcrumb a {
  color: var(--text-light);
  text-decoration: none;
  transition: color .2s;
}

.breadcrumb a:hover { color: var(--blue); }

.bc-sep { color: var(--border); }

.bc-current {
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 260px;
}

/* レイアウト */
.single-wrap {
  padding: 56px 0 80px;
}

.single-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}

@media (max-width: 900px) {
  .single-layout { grid-template-columns: 1fr; }
}

/* 記事ヘッダー */
.single-header {
  margin-bottom: 32px;
}

.single-cat {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  color: var(--blue);
  background: rgba(100,149,237,.1);
  padding: 3px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
  text-decoration: none;
  transition: background .2s;
}

.single-cat:hover { background: rgba(100,149,237,.2); }

.single-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.45;
  color: var(--text);
  margin-bottom: 16px;
}

.single-meta {
  font-size: .83rem;
  color: var(--text-light);
  font-family: 'Montserrat', sans-serif;
  display: flex;
  align-items: center;
  gap: 12px;
}

.single-updated { font-size: .78rem; }

/* アイキャッチ */
.single-eyecatch {
  margin-bottom: 40px;
  border-radius: 12px;
  overflow: hidden;
}

.single-eyecatch img {
  width: 100%;
  height: auto;
  display: block;
}

/* 目次 */
.toc-box {
  background: var(--bg-light);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 24px 28px;
  margin-bottom: 40px;
}

.toc-title {
  font-size: .9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.toc-list {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-list li a {
  font-size: .88rem;
  color: var(--blue);
  text-decoration: none;
  line-height: 1.5;
  transition: opacity .2s;
}

.toc-list li a:hover { opacity: .7; text-decoration: underline; }

/* 本文 */
.single-content {
  font-size: .97rem;
  line-height: 2;
  color: var(--text);
}

.single-content h2 {
  font-size: 1.35rem;
  font-weight: 800;
  border-left: 4px solid var(--blue);
  padding-left: 14px;
  margin: 48px 0 20px;
  line-height: 1.4;
}

.single-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  border-bottom: 2px solid var(--border);
  padding-bottom: 8px;
  margin: 36px 0 16px;
}

.single-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--blue);
}

.single-content p { margin-bottom: 1.5em; }

.single-content a {
  color: var(--blue);
  text-decoration: underline;
}

.single-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 16px 0;
}

.single-content ul,
.single-content ol {
  padding-left: 1.8em;
  margin-bottom: 1.5em;
}

.single-content ul { list-style: none; padding-left: 0; }

.single-content ul li {
  margin-bottom: .6em;
  line-height: 1.8;
  padding-left: 1.4em;
  position: relative;
}

.single-content ul li::before {
  content: "●";
  color: var(--blue);
  font-size: .65em;
  position: absolute;
  left: 0;
  top: .45em;
}

.single-content ol li { margin-bottom: .6em; line-height: 1.8; }

.single-content strong {
  font-weight: 700;
  color: var(--navy);
  background: linear-gradient(transparent 60%, rgba(100,149,237,.2) 60%);
  padding: 0 2px;
}

.single-content blockquote {
  background: var(--bg-light);
  border-left: 4px solid var(--blue);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text-light);
}

.single-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
  font-size: .9rem;
}

.single-content th,
.single-content td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}

.single-content th {
  background: var(--navy);
  color: var(--white);
  font-weight: 600;
}

.single-content tr:nth-child(even) td { background: var(--bg-light); }

.single-content code {
  background: var(--bg-light);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: .85em;
  font-family: 'Courier New', monospace;
}

.single-content pre {
  background: var(--navy);
  color: #e0e6f0;
  padding: 20px 24px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1.5em;
}

.single-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: .88rem;
}

/* タグ */
.single-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.single-tag {
  font-size: .8rem;
  color: var(--text-light);
  background: var(--bg-light);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 999px;
  text-decoration: none;
  transition: all .2s;
}

.single-tag:hover {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--white);
}

/* 前後記事ナビ */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.post-nav-prev,
.post-nav-next { display: flex; }

.post-nav-next { justify-content: flex-end; }

.post-nav a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-decoration: none;
  padding: 16px 20px;
  background: var(--bg-light);
  border-radius: 10px;
  transition: background .2s;
  max-width: 280px;
}

.post-nav-next a { text-align: right; }

.post-nav a:hover { background: rgba(100,149,237,.1); }

.post-nav-label {
  font-size: .78rem;
  color: var(--blue);
  font-weight: 600;
}

.post-nav-title {
  font-size: .88rem;
  color: var(--text);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 一覧に戻る */
.back-to-list {
  margin-top: 32px;
  text-align: center;
}

/* ========== SIDEBAR ========== */
.single-sidebar {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 22px 20px;
}

.widget-title {
  font-size: .85rem;
  font-weight: 700;
  color: var(--text);
  border-bottom: 2px solid var(--blue);
  padding-bottom: 8px;
  margin-bottom: 16px;
}

/* 著者 */
.author-box {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.author-avatar img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
}

.author-name {
  font-size: .9rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.author-bio {
  font-size: .8rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* カテゴリ */
.sidebar-cat-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-cat-list li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px;
  font-size: .88rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: color .2s;
}

.sidebar-cat-list li:last-child a { border-bottom: none; }

.sidebar-cat-list li a:hover { color: var(--blue); }

.cat-count {
  font-size: .75rem;
  color: var(--text-light);
  background: var(--bg-light);
  padding: 2px 8px;
  border-radius: 999px;
}

/* 新着記事 */
.sidebar-recent {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-recent li a {
  display: flex;
  gap: 12px;
  text-decoration: none;
  align-items: flex-start;
  transition: opacity .2s;
}

.sidebar-recent li a:hover { opacity: .7; }

.recent-thumb {
  width: 64px;
  height: 48px;
  border-radius: 6px;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}

.recent-thumb--noimg {
  background: linear-gradient(135deg, var(--navy), var(--navy-mid));
}

.recent-body { flex: 1; }

.recent-title {
  font-size: .82rem;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.recent-body time {
  font-size: .75rem;
  color: var(--text-light);
  font-family: 'Montserrat', sans-serif;
}

/* サイドバーCTA */
.sidebar-cta {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  border-color: transparent;
  text-align: center;
}

.sidebar-cta-text {
  font-size: .9rem;
  color: var(--white);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* ============================================================
   RELATED POSTS
   ============================================================ */
.related-posts {
  padding: 72px 0;
}

/* ============================================================
   HEADER offset for fixed header
   ============================================================ */
.blog-archive-page .blog-archive,
.blog-single-page .breadcrumb-wrap {
  /* front-page.cssのheader高さ（約72px）分を確保 */
}

/* archive page の hero は header の下に来るよう margin-top */
.blog-archive-page .page-hero {
  margin-top: 72px;
}