.category-grid {
  display: grid;
  gap: 1.5rem;
}

.category-card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  color: var(--color-text-primary);
  transition: transform var(--transition), box-shadow var(--transition);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  color: var(--color-text-primary);
}

.category-icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.category-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.category-card p {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.category-pages {
  list-style: none;
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-bottom: 1rem;
}

.category-pages li {
  padding: 0.25rem 0;
}

.category-pages li::before {
  content: "→ ";
  color: var(--color-primary);
}

.category-pages li.category-group-label {
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-top: 0.5rem;
  padding: 0.25rem 0 0;
}

.category-pages li.category-group-label::before {
  content: "";
}

.category-pages li.category-group-label:first-child {
  margin-top: 0;
}

.category-cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.recent-grid {
  display: grid;
  gap: 1.25rem;
}

.recent-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.recent-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.recent-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.1875rem 0.625rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.5rem;
}

.tag-ai {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.tag-invest {
  background: var(--color-success-light);
  color: var(--color-success);
}

.tag-neuro {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.tag-reading {
  background: var(--color-warning-light);
  color: var(--color-reading-text);
}

.recent-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.recent-card h3 a {
  display: block;
  padding: 0.25rem 0;
  color: var(--color-text-primary);
}

.recent-card h3 a:hover {
  color: var(--color-primary);
}

.recent-card p {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  line-height: 1.5;
}

.article-grid {
  display: grid;
  gap: 1.5rem;
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.article-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.1875rem 0.625rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.article-card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.article-card h3 a {
  display: block;
  padding: 0.25rem 0;
  color: var(--color-text-primary);
}

.article-card h3 a:hover {
  color: var(--color-primary);
}

.article-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.diary-project {
  margin-bottom: 2rem;
}

.diary-project-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.diary-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--color-border);
  margin-left: 0.5rem;
}

.diary-entry {
  padding: 0.75rem 0 0.75rem 1.5rem;
  position: relative;
  transition: background var(--transition);
}

.diary-entry::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 1.125rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}

.diary-entry:hover {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
}

.diary-date {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-tertiary);
  margin-bottom: 0.25rem;
  font-variant-numeric: tabular-nums;
}

.diary-entry h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.diary-entry h3 a {
  color: var(--color-text-primary);
}

.diary-entry h3 a:hover {
  color: var(--color-primary);
}

.diary-entry p {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
}

@media (min-width: 23.4375rem) {
  .category-card {
    padding: 1.25rem;
  }

  .category-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
  }

  .category-card h3 {
    font-size: 1.25rem;
  }

  .category-card p {
    font-size: 0.9375rem;
  }
}

@media (min-width: 48rem) {
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .recent-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .recent-card {
    padding: 1.25rem 1.5rem;
  }

  .recent-card h3 a {
    display: inline;
    padding: 0;
  }

  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-card {
    padding: 1.75rem;
  }

  .article-card h3 a {
    display: inline;
    padding: 0;
  }
}