/* ========== ARTICLE PAGE ========== */

.article {
  background: var(--color-bg-card);
  border-radius: 8px;
  box-shadow: var(--shadow-card);
  max-width: 760px;
  margin: 40px auto;
  padding: 48px 56px;
}

/* Header */
.article-header {
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.article-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.article-date {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* Body */
.article-body {
  line-height: 1.9;
}

.article-section {
  margin-bottom: 48px;
}

.article-section h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent-light);
  color: var(--color-text-primary);
}

.article-section p {
  margin-bottom: 16px;
  color: var(--color-text-primary);
}

.article-section p:last-child {
  margin-bottom: 0;
}

.article-section a {
  color: var(--color-accent);
  text-decoration: none;
}

.article-section a:hover {
  text-decoration: underline;
}

.article-section code {
  font-family: var(--font-code);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.9em;
}

/* Blockquote */
.article-section blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-light);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 6px 6px 0;
  color: var(--color-text-secondary);
}

/* Rule list */
.article-rule-list {
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-rule-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px 24px;
}

.article-rule-item h3 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.article-rule-item p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.article-rule-item p:last-child {
  margin-bottom: 0;
}

/* Article nav */
.article-nav {
  display: flex;
  gap: 12px;
  margin-top: 48px;
}

.article-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 20px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.article-nav-item:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.article-nav-empty {
  flex: 1;
}

.article-nav-prev .article-nav-label {
  text-align: left;
}

.article-nav-next .article-nav-label {
  text-align: right;
}

.article-nav-next .article-nav-title {
  text-align: right;
}

.article-nav-label {
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 700;
}

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

@media (max-width: 768px) {
  .article-nav {
    flex-direction: column;
  }

  .article-nav-next .article-nav-label,
  .article-nav-next .article-nav-title {
    text-align: left;
  }
}

/* Footer */
.article-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.article-author-sign {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: right;
}

/* Lists */
.article-section ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

.article-section ul li {
  margin-bottom: 6px;
  color: var(--color-text-primary);
}

/* Pre block */
.article-pre {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 24px 0;
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: var(--text-sm);
  line-height: 1.7;
  white-space: pre;
  color: var(--color-text-secondary);
}

/* サイドバーあり時は幅制限を解除して main-content 全幅を使う */
.content-wrapper--with-sidebar .article {
  max-width: 100%;
  margin: 40px 0;
}

/* Responsive */
@media (max-width: 768px) {
  .article {
    margin: 16px;
    padding: 28px 20px;
  }

  .article-title {
    font-size: var(--text-xl);
  }
}