/* =========================================================
   article.css
   - Article page hero
   - Article body typography
   - Related articles block
   ========================================================= */

.article {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.article__header {
  margin-bottom: 32px;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

.article__meta-tag {
  display: inline-block;
  padding: 2px 10px;
  background: rgba(245, 158, 11, 0.14);
  color: var(--color-accent-strong);
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.article__title {
  font-size: clamp(1.55rem, 1.1rem + 1.8vw, 2.15rem);
  font-weight: 700;
  line-height: 1.5;
  color: #f1f5f9;
  margin: 0 0 16px;
}

.article__description {
  font-size: 1rem;
  color: var(--color-text-soft);
  margin: 0 0 24px;
}

/* TL;DR box (この記事でわかること) */
.tldr {
  padding: 18px 20px;
  background: linear-gradient(
    180deg,
    rgba(245, 158, 11, 0.08) 0%,
    rgba(30, 41, 59, 0.4) 100%
  );
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  margin-bottom: 32px;
}

.tldr__title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent-strong);
  margin: 0 0 10px;
}

.tldr__list {
  margin: 0;
  padding-left: 1.2em;
  color: var(--color-text-soft);
}

.tldr__list li {
  margin-bottom: 4px;
}

/* ---------- Article body typography ---------- */
.article-body {
  color: var(--color-text-soft);
  font-size: 1rem;
  line-height: 1.9;
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 2.6rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid rgba(245, 158, 11, 0.25);
  color: #f1f5f9;
  scroll-margin-top: 80px;
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
  color: #e2e8f0;
}

.article-body h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
  color: #e2e8f0;
}

.article-body p {
  margin: 0 0 1.2rem;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.2rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body strong {
  color: #f1f5f9;
  font-weight: 700;
}

.article-body a {
  color: var(--color-accent-strong);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-body a:hover {
  color: var(--color-accent);
}

.article-body blockquote {
  margin: 1.5rem 0;
  padding: 14px 18px;
  border-left: 4px solid var(--color-accent);
  background: rgba(30, 41, 59, 0.55);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

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

.article-body hr {
  border: 0;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
  margin: 2.5rem 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.article-body thead th {
  text-align: left;
  background: rgba(30, 41, 59, 0.7);
  color: #f1f5f9;
  padding: 10px 12px;
  border-bottom: 2px solid rgba(148, 163, 184, 0.25);
  font-weight: 700;
}

.article-body tbody td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
  color: var(--color-text-soft);
}

.article-body .callout {
  margin: 1.5rem 0;
  padding: 14px 18px;
  background: rgba(30, 41, 59, 0.5);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

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

/* ---------- Related articles ---------- */
.related {
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.related__title {
  font-size: 1.05rem;
  margin-bottom: 14px;
  color: #f1f5f9;
}

.related__list {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  list-style: none;
  padding: 0;
  margin: 0;
}

@media (min-width: 768px) {
  .related__list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.related__item {
  margin: 0;
}

.related__link {
  display: block;
  padding: 14px 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.55;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.related__link:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--color-text);
}

.related__tag {
  display: inline-block;
  font-size: 0.72rem;
  color: var(--color-accent-strong);
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-bottom: 4px;
}