.diary-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.diary-tab {
  font-size: 12px;
  font-weight: 700;
  padding: 8px 18px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-card-bg);
  color: var(--color-text-light);
  cursor: pointer;
}
.diary-tab.active { background: var(--color-main); color: var(--color-bg); border-color: var(--color-main); }

.diary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.diary-grid-card {
  display: block;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.diary-grid-card .img-placeholder { aspect-ratio: 4/3; }
.diary-grid-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; }
.diary-grid-card .body { padding: 16px 18px 20px; }
.diary-grid-card .date { font-size: 11px; color: var(--color-text-sub); margin-bottom: 6px; }
.diary-grid-card h3 { font-family: var(--font-sans); font-size: 16px; font-weight: 700; color: var(--color-text); margin: 0 0 8px; line-height: 1.6; }
.diary-grid-card .excerpt { font-size: 12.5px; color: var(--color-text-sub); margin: 0; }
.diary-grid-card .tags { margin-top: 10px; display: flex; gap: 6px; flex-wrap: wrap; }

.diary-empty { text-align: center; color: var(--color-text-sub); padding: 40px 0; }

@media (max-width: 860px) {
  .diary-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .diary-grid { grid-template-columns: 1fr; }
}

/* ==================== 個別記事ページ ==================== */
.post-header { text-align: center; padding: 48px 0 32px; }
.post-header .date { font-size: 12px; color: var(--color-text-sub); margin-bottom: 10px; }
.post-header h1 { font-size: 26px; max-width: 680px; margin: 0 auto 14px; }
.post-header .tags { display: flex; justify-content: center; gap: 6px; flex-wrap: wrap; }

.post-thumb { max-width: 780px; margin: 0 auto 40px; }
.post-thumb .img-placeholder { aspect-ratio: 16/9; }
.post-thumb img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; border-radius: var(--radius); }

.post-body { max-width: 680px; margin: 0 auto; }
.post-body p { font-size: 16px; line-height: 1.9; }
.post-body h2 { font-size: 20px; color: var(--color-main); margin: 40px 0 16px; line-height: 1.5; }
.post-body h3 { font-size: 16.5px; color: var(--color-text); margin: 32px 0 14px; line-height: 1.5; }
.post-body a { color: var(--color-main); text-decoration: underline; text-underline-offset: 2px; }
.post-body img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin: 28px 0;
}

.post-share {
  max-width: 680px;
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 16px;
}
.post-share .label { font-size: 12px; color: var(--color-text-sub); font-weight: 700; }
.post-share a {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--color-main-bg-light);
  display: flex; align-items: center; justify-content: center;
}
.post-share a img { width: 16px; height: 16px; }

.post-nav {
  max-width: 680px;
  margin: 24px auto 0;
  display: flex;
  gap: 16px;
}
.post-nav-link {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card-bg);
}
.post-nav-link:hover { border-color: var(--color-main); background: var(--color-main-bg-light); }
.post-nav-next { text-align: right; align-items: flex-end; }
.post-nav-empty { border: none; background: none; }
.post-nav-arrow { font-size: 11px; color: var(--color-text-sub); font-weight: 700; }
.post-nav-title {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-back { text-align: center; margin: 40px auto 0; }