/* ═══════════════════════════════════════════════════════
   ツギテ — Blog Stylesheet
   blog/index.html と blog/post.html 固有のスタイル
   共通スタイルは css/style.css に記載
═══════════════════════════════════════════════════════ */

/* ═══════════════════════════════════════════════════════
   PATTERN — BLOG LISTING
═══════════════════════════════════════════════════════ */

/* Category filter */
.blog-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}
.blog-filter-btn {
  padding: 7px 20px;
  font-family: var(--f);
  font-feature-settings: 'palt' 1;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1.5px solid var(--line);
  border-radius: 9999px;
  background: var(--white);
  color: var(--muted);
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}
.blog-filter-btn:hover {
  border-color: var(--navy);
  color: var(--navy);
}
.blog-filter-btn.is-active {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
}

/* Blog cards (extended) */
.blog-card {
  position: relative;
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}
.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0,49,73,0.09);
  border-color: rgba(0,49,73,0.18);
}
.blog-card.is-hidden { display: none; }

/* Full-card link overlay */
.blog-card-link {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* Thumbnail (extended) */
.blog-thumb {
  border-bottom: 1px solid var(--line);
}

/* Card body (extended) */
.blog-card-body { position: relative; }

/* Blog title override */
.blog-title { line-height: 1.55; }

/* Blog excerpt override */
.blog-excerpt { margin-bottom: 18px; }

/* Blog more (extended) */
.blog-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Empty state */
.blog-empty {
  grid-column: 1 / -1;
  padding: 64px 40px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  display: none;
}
.blog-empty.is-visible { display: block; }

/* Loading */
.blog-loading {
  grid-column: 1 / -1;
  padding: 64px 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}
.blog-loading.is-hidden { display: none; }

@keyframes spin {
  to { transform: rotate(360deg); }
}
.blog-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Thumbnail image */
.blog-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ═══════════════════════════════════════════════════════
   POST — BREADCRUMB
═══════════════════════════════════════════════════════ */
.post-breadcrumb {
  margin-top: 62px; /* 固定ヘッダーの高さ分 */
  background: var(--pale);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}
.breadcrumb-list a {
  color: var(--muted);
  transition: color var(--ease);
}
.breadcrumb-list a:hover { color: var(--accent); }
.breadcrumb-sep { color: var(--line); user-select: none; }
.breadcrumb-current {
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 380px;
}

/* ═══════════════════════════════════════════════════════
   POST — EYECATCH
═══════════════════════════════════════════════════════ */
.post-eyecatch-section {
  background: var(--pale);
  padding: 40px 0 0;
}
.post-eyecatch-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 40px;
}
.post-eyecatch {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px 6px 0 0;
}

/* ═══════════════════════════════════════════════════════
   POST — ARTICLE HEADER & BODY
═══════════════════════════════════════════════════════ */
.post-article {
  max-width: 760px;
  margin: 0 auto;
  padding: 52px 40px 80px;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}
.post-cat {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(0,119,168,0.08);
  padding: 4px 14px;
  border-radius: 9999px;
}
.post-date {
  font-size: 13px;
  color: var(--muted);
  font-family: var(--f-mono);
}

.post-title {
  font-size: clamp(22px, 3.8vw, 34px);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.48;
  letter-spacing: 0.02em;
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 2px solid var(--line);
}

/* ── 本文エリア ── */
.blog-body {
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

.blog-body h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.48;
  margin-top: 56px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line);
}
.blog-body h2:first-child { margin-top: 0; }

.blog-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-top: 36px;
  margin-bottom: 12px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
}

.blog-body p {
  margin-bottom: 1.6em;
}

.blog-body ul,
.blog-body ol {
  margin: 0.8em 0 1.6em 1.6em;
  line-height: 1.9;
}
.blog-body ul { list-style: disc; }
.blog-body ol { list-style: decimal; }
.blog-body li { margin-bottom: 0.5em; }

.blog-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2em auto;
  border-radius: 4px;
}

.blog-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--ease);
}
.blog-body a:hover { color: var(--navy); }

.blog-body strong {
  font-weight: 700;
  color: var(--navy);
}

/* ── 一覧へ戻るリンク ── */
.post-back {
  margin-top: 60px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.post-back a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  transition: color var(--ease), gap var(--ease);
}
.post-back a:hover {
  color: var(--navy);
  gap: 10px;
}
.post-back a::before {
  content: '←';
  display: inline-block;
  transition: transform var(--ease);
}
.post-back a:hover::before { transform: translateX(-3px); }

/* ── ローディング ── */
.post-loading {
  padding: 80px 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}
.post-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ── エラー ── */
.post-error {
  padding: 80px 40px;
  text-align: center;
  color: var(--muted);
  font-size: 15px;
}
.post-error p { margin-bottom: 24px; }
.post-error a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE — TABLET (≤768px)
═══════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .blog-filter { gap: 6px; }
  .blog-filter-btn { font-size: 11px; padding: 6px 16px; }

  .post-eyecatch-wrap { padding: 0 24px; }
  .post-article { padding: 36px 24px 60px; }

  .breadcrumb-current { max-width: 200px; }
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE — MOBILE (≤480px)
═══════════════════════════════════════════════════════ */
@media (max-width: 480px) {
  .post-eyecatch-wrap { padding: 0 20px; }
  .post-article { padding: 28px 20px 52px; }

  .blog-body h2 { font-size: 18px; }
  .blog-body h3 { font-size: 16px; }
  .blog-body { font-size: 15px; }
}