/* column.css — コラム一覧・記事詳細共通スタイル */

.container { width: min(1000px, 100% - 4rem); margin-inline: auto; }

/* ============================
   記事一覧
============================ */
#articles { background: var(--off-white); padding-block: 100px; }

/* カテゴリフィルター */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-block-end: 2.5rem;
}

.category-btn {
  padding: .5rem 1.25rem;
  font-size: .78rem;
  font-weight: 500;
  color: var(--g500);
  background: var(--white);
  border: 1px solid var(--g100);
  border-radius: 2rem;
  cursor: pointer;
  font-family: var(--font-jp);
  letter-spacing: .03em;
  transition: background var(--tr), color var(--tr), border-color var(--tr);
}
.category-btn:hover { background: var(--off-white); color: var(--black); border-color: var(--g300); }
.category-btn.active { background: var(--black); color: var(--white); border-color: var(--black); }

.articles-loading {
  text-align: center;
  padding-block: 4rem;
  font-size: .85rem;
  color: var(--g500);
  font-weight: 400;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--g100);
  border: 1px solid var(--g100);
}

.article-card {
  background: var(--white);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  overflow: hidden;
  transition: background var(--tr);
}
.article-card:hover { background: var(--off-white); }

.article-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--g100);
  flex-shrink: 0;
}
.article-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}
.article-card:hover .article-card-thumb img { transform: scale(1.03); }

.article-card-body {
  padding: 1.75rem 2rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.article-card-date {
  font-family: var(--font-en);
  font-size: .72rem;
  font-weight: 400;
  color: var(--g500);
  letter-spacing: .06em;
}

.article-card-category {
  font-size: .68rem;
  font-weight: 500;
  color: var(--g500);
  border: 1px solid var(--g100);
  padding: .15rem .65rem;
  letter-spacing: .04em;
}

.article-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--black);
  line-height: 1.6;
  letter-spacing: -.01em;
  flex: 1;
}

.article-card-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-en);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--g300);
  margin-block-start: .5rem;
  transition: color var(--tr);
}
.article-card:hover .article-card-link { color: var(--black); }
.article-card-link svg { transition: transform var(--tr); }
.article-card:hover .article-card-link svg { transform: translateX(3px); }

/* ============================
   記事詳細
============================ */
#articleMain { background: var(--white); }

.article-loading {
  text-align: center;
  padding-block: 6rem;
  font-size: .85rem;
  color: var(--g500);
  font-weight: 400;
}

.article-hero {
  background: var(--black);
  padding-block: 100px 80px;
  position: relative;
}
.article-hero .hero-line {
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: 40px;
  height: 1px;
  background: rgba(255,255,255,.15);
}

.article-hero-inner { width: min(760px, 100% - 4rem); margin-inline: auto; }

.article-back {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-en);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--g500);
  text-decoration: none;
  margin-block-end: 2.5rem;
  transition: color var(--tr);
}
.article-back:hover { color: var(--white); }
.article-back svg { transition: transform var(--tr); }
.article-back:hover svg { transform: translateX(-3px); }

.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-block-end: 1.5rem;
}

.article-date {
  font-family: var(--font-en);
  font-size: .72rem;
  color: var(--g500);
  letter-spacing: .06em;
}

.article-category {
  font-size: .68rem;
  font-weight: 500;
  color: var(--g500);
  border: 1px solid rgba(255,255,255,.1);
  padding: .15rem .65rem;
  letter-spacing: .04em;
}

.article-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.35;
  letter-spacing: -.02em;
}

.article-body {
  width: min(760px, 100% - 4rem);
  margin-inline: auto;
  padding-block: 72px 100px;
}

.article-body p {
  font-size: .95rem;
  color: var(--g700);
  line-height: 2;
  font-weight: 400;
  margin-block-end: 1.75rem;
}

.article-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--black);
  margin-block: 3rem 1.25rem;
  letter-spacing: -.02em;
  padding-block-end: .75rem;
  border-block-end: 1px solid var(--g100);
}

.article-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--black);
  margin-block: 2.5rem 1rem;
}

.article-body ul,
.article-body ol {
  padding-inline-start: 1.5rem;
  margin-block-end: 1.75rem;
}

.article-body li {
  font-size: .95rem;
  color: var(--g700);
  line-height: 1.9;
  font-weight: 400;
  margin-block-end: .4rem;
}

.article-body strong {
  color: var(--black);
  font-weight: 600;
}

.article-body a {
  color: var(--black);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-block: 2rem;
  font-size: .88rem;
}

.article-body th,
.article-body td {
  padding: .875rem 1.25rem;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--g100);
  line-height: 1.75;
  font-weight: 400;
  color: var(--g700);
}

.article-body th {
  background: var(--off-white);
  font-weight: 600;
  color: var(--black);
  white-space: nowrap;
}

.article-body blockquote {
  border-inline-start: 2px solid var(--g100);
  padding-inline-start: 1.5rem;
  margin-block: 2rem;
  color: var(--g500);
  font-style: normal;
}

.article-footer {
  width: min(760px, 100% - 4rem);
  margin-inline: auto;
  padding-block-end: 80px;
  border-block-start: 1px solid var(--g100);
  padding-block-start: 2.5rem;
}

.article-footer-back {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .82rem;
  font-weight: 500;
  color: var(--black);
  text-decoration: none;
  transition: opacity var(--tr);
}
.article-footer-back:hover { opacity: .6; }

/* ============================
   関連記事
============================ */
.related-articles {
  background: var(--off-white);
  padding-block: 48px;
  border-block-start: 1px solid var(--g100);
}

.related-inner {
  width: min(1000px, 100% - 4rem);
  margin-inline: auto;
}

.related-label {
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--g500);
  margin-block-end: 1.25rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--g100);
  border: 1px solid var(--g100);
  margin-block-end: 1.5rem;
}

/* 関連記事カード専用：画像を小さく・パディングを詰める */
.related-grid .article-card-thumb { aspect-ratio: 16 / 7; }
.related-grid .article-card-body  { padding: 1rem 1.25rem 1.25rem; gap: .5rem; }
.related-grid .article-card-title { font-size: .85rem; }
.related-grid .article-card-meta  { gap: .5rem; }
.related-grid .article-card-date  { font-size: .68rem; }
.related-grid .article-card-category { font-size: .65rem; }
.related-grid .article-card-link  { display: none; }

.related-more {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-en);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--g500);
  text-decoration: none;
  transition: color var(--tr);
}
.related-more:hover { color: var(--black); }
.related-more svg { transition: transform var(--tr); }
.related-more:hover svg { transform: translateX(3px); }

@media (max-width: 768px) {
  #articles { padding-block: 72px; }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .article-hero { padding-block: 72px 60px; }
  .related-grid { grid-template-columns: 1fr; }
  .related-articles { padding-block: 60px; }
}
@media (max-width: 480px) {
  .articles-grid { grid-template-columns: 1fr; }
}