/* articles.css */

.articles-section {
  padding: 120px 0 80px;
}

.articles-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--space-xs);
  letter-spacing: 0.15em;
  color: var(--color-accent);
}

.articles-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: var(--space-xl);
  letter-spacing: 0.05em;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

/* 記事カード */
.article-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: var(--color-text-primary);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s ease;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.article-card__img-wrap {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  overflow: hidden;
  background-color: var(--color-border-subtle);
}

.article-card__img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-card__img {
  transform: scale(1.05);
}

.article-card__content {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-card__date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.article-card__category {
  display: inline-block;
  font-size: 0.75rem;
  padding: 4px 8px;
  background-color: var(--color-border-subtle);
  border-radius: 4px;
  margin-bottom: 12px;
  align-self: flex-start;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.article-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 記事詳細 */
.article-detail-section {
  padding: 120px 0 80px;
}

.article-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-xl);
}

.article-header__category {
  display: inline-block;
  font-size: 0.85rem;
  padding: 6px 12px;
  background-color: var(--color-border-subtle);
  border-radius: 4px;
  margin-bottom: 16px;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.article-header__title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-header__date {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.article-eyecatch {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto var(--space-xl);
  border-radius: 12px;
  overflow: hidden;
  background-color: var(--color-border-subtle);
}

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

.article-body {
  max-width: 740px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.article-body h2 {
  font-size: 1.5rem;
  color: var(--color-text-primary);
  margin: 2.5em 0 1em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid var(--color-border-subtle);
}

.article-body h3 {
  font-size: 1.25rem;
  color: var(--color-text-primary);
  margin: 2em 0 0.8em;
}

.article-body p {
  margin-bottom: 1.5em;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 2em 0;
}

.article-body ul, .article-body ol {
  margin: 1.5em 0;
  padding-left: 1.5em;
}

.article-body li {
  margin-bottom: 0.5em;
}

.article-body a {
  color: var(--color-accent);
  text-decoration: underline;
}

.article-body a:hover {
  text-decoration: none;
}

/* 戻るボタン */
.article-back {
  text-align: center;
  margin-top: var(--space-xxl);
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-back:hover {
  background-color: var(--color-text-primary);
  color: var(--color-surface);
}

/* Loader */
.article-loader {
  display: flex;
  justify-content: center;
  padding: 60px 0;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(0,0,0,0.1);
  border-left-color: var(--color-text-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}