/* ===== コラム一覧 ===== */
.column-hero {
  margin-top: 80px;
  background: var(--navy);
  padding: 56px 32px;
  text-align: center;
  color: #fff;
}
.column-hero h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; margin-bottom: 10px; }
.column-hero p { font-size: 0.95rem; opacity: 0.8; }

.column-main { padding: 56px 32px; background: #f7f9fc; min-height: 60vh; }
.column-inner { max-width: 1100px; margin: 0 auto; }

/* カテゴリフィルター */
.category-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.cat-btn {
  padding: 6px 18px;
  border-radius: 20px;
  border: 2px solid #ddd;
  background: #fff;
  color: #555;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.cat-btn:hover, .cat-btn.active {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
}

/* 記事グリッド */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.article-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.article-card:hover { transform: translateY(-4px); box-shadow: 0 8px 20px rgba(0,0,0,0.1); }
.article-card-img {
  height: 180px;
  background: #e8edf2;
  overflow: hidden;
  position: relative;
}
.article-card-img img { width: 100%; height: 100%; object-fit: cover; }
.article-cat {
  position: absolute;
  top: 12px; left: 12px;
  background: var(--orange);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 3px;
}
.article-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.article-date { font-size: 0.78rem; color: #aaa; margin-bottom: 8px; }
.article-card-body h2 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 10px;
  flex: 1;
}
.article-excerpt { font-size: 0.83rem; color: #666; line-height: 1.7; margin-bottom: 14px; }
.article-link {
  font-size: 0.83rem;
  font-weight: 700;
  color: var(--orange);
  display: flex;
  align-items: center;
  gap: 4px;
}
.article-link::after { content: '→'; }

/* ===== 記事詳細 ===== */
.article-hero {
  margin-top: 80px;
  background: var(--navy);
  padding: 48px 32px;
  color: #fff;
}
.article-hero-inner { max-width: 800px; margin: 0 auto; }
.article-hero .article-cat { position: static; display: inline-block; margin-bottom: 16px; }
.article-hero h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
}
.article-meta { font-size: 0.85rem; opacity: 0.7; }

.article-body-wrap { background: #fff; padding: 56px 32px; }
.article-body { max-width: 800px; margin: 0 auto; }

/* 記事本文スタイル */
.article-body h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--navy);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--orange);
}
.article-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin: 28px 0 12px;
}
.article-body p {
  font-size: 0.95rem;
  color: #444;
  line-height: 2;
  margin-bottom: 16px;
}
.article-body ul, .article-body ol {
  padding-left: 20px;
  margin-bottom: 20px;
}
.article-body li {
  font-size: 0.93rem;
  color: #444;
  line-height: 1.9;
  margin-bottom: 4px;
}
.article-body strong { color: var(--navy); }

.article-info-box {
  background: #fff8f4;
  border-left: 4px solid var(--orange);
  border-radius: 0 6px 6px 0;
  padding: 20px 24px;
  margin: 28px 0;
}
.article-info-box p { margin-bottom: 0; }

.article-summary {
  background: #f0f4f8;
  border-radius: 8px;
  padding: 24px 28px;
  margin: 36px 0;
}
.article-summary h3 { color: var(--navy); margin-top: 0; margin-bottom: 12px; font-size: 1rem; }

/* 記事CTA */
.article-cta {
  background: var(--navy);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  color: #fff;
  margin: 48px 0;
}
.article-cta h3 { font-size: 1.3rem; font-weight: 700; margin: 0 0 10px; color: #fff; }
.article-cta p { margin-bottom: 24px; font-size: 0.93rem; color: #fff; line-height: 1.8; }

/* 関連記事 */
.related-articles { margin-top: 48px; padding-top: 32px; border-top: 1px solid #eee; }
.related-articles h3 { font-size: 1rem; font-weight: 700; color: var(--navy); margin-bottom: 16px; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.related-card {
  background: #f7f9fc;
  border-radius: 6px;
  padding: 16px;
  border-left: 3px solid var(--navy);
}
.related-card .article-cat { position: static; display: inline-block; font-size: 0.7rem; padding: 2px 8px; margin-bottom: 6px; }
.related-card h4 { font-size: 0.88rem; font-weight: 700; color: var(--navy); line-height: 1.5; }

/* レスポンシブ */
@media (max-width: 768px) {
  .column-hero, .article-hero { padding: 40px 20px; }
  .column-main, .article-body-wrap { padding: 36px 20px; }
  .article-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
}