/* ── About page layout ── */
.about-wrapper {
  padding: 0.5rem 0;
}

/* Section headings */
.about-section {
  margin-bottom: 3rem;
}
.about-section h2 {
  margin-top: 0;
  border-bottom: 1px solid var(--gray-200);
  padding-bottom: 0.5rem;
}

/* Two-column grid for books + projects */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
@media screen and (max-width: 40rem) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Books ── */
.book-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.book-item {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  color: inherit;
  text-decoration: none;
}
.book-cover {
  width: 3.5rem;
  height: auto;
  object-fit: cover;
  border-radius: var(--border-radius);
  border: 1px solid var(--gray-200);
  flex-shrink: 0;
}
.book-cover-placeholder {
  width: 3.5rem;
  height: 4.5rem;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.book-cover-placeholder svg {
  opacity: 0.4;
}
.book-title {
  font-weight: 500;
  line-height: 1.4;
}
.book-author {
  font-size: var(--font-size-smaller);
  opacity: 0.6;
  margin-top: 0.2rem;
}
.about-empty {
  opacity: 0.5;
  font-size: var(--font-size-smaller);
}

/* ── Projects ── */
.project-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.project-item {
  padding: 0.75rem;
  background: var(--gray-100);
  border-radius: var(--border-radius);
  border: 1px solid var(--gray-200);
}
.project-item-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}
.project-title {
  font-weight: 500;
}
.project-desc {
  font-size: var(--font-size-smaller);
  opacity: 0.7;
  margin-top: 0.25rem;
  line-height: 1.5;
}
.project-link {
  flex-shrink: 0;
  font-size: var(--font-size-smaller);
  color: var(--color-link);
}
.project-link svg {
  vertical-align: middle;
}

/* ── Heatmap ── */
.heatmap-scroll {
  overflow-x: auto;
}
#heatmap-svg {
  display: block;
  font-size: 10px;
}
#heatmap-tooltip {
  position: fixed;
  display: none;
  background: var(--body-background);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  padding: 0.3rem 0.6rem;
  font-size: var(--font-size-smallest);
  pointer-events: none;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .12);
}

/* ── Timeline ── */
.timeline-year {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
  opacity: 0.8;
}
.timeline-month {
  margin-bottom: 1.25rem;
}
.timeline-month-label {
  font-size: var(--font-size-smaller);
  font-weight: 500;
  opacity: 0.55;
  margin-bottom: 0.4rem;
}
.timeline-articles {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--gray-200);
  padding-left: 1rem;
}
.timeline-article {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.2rem 0;
  gap: 1rem;
}
.timeline-article a {
  color: var(--color-link);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.timeline-article-date {
  font-size: var(--font-size-smallest);
  opacity: 0.5;
  white-space: nowrap;
  flex-shrink: 0;
}