.page-topics {
  --topics-index-col: 104px;
  --topics-toc-col: 168px;
}

.page-topics img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 首屏 ---------- */

.page-topics .topics-hero {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
}

.page-topics .topics-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.page-topics .topics-hero__index {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  scrollbar-width: none;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

.page-topics .topics-hero__index::-webkit-scrollbar {
  display: none;
}

.page-topics .topics-hero__index span {
  flex: 0 0 auto;
}

.page-topics .topics-hero__main {
  min-width: 0;
}

.page-topics .topics-hero__title {
  margin: var(--space-3) 0 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-topics .topics-hero__lead {
  margin: var(--space-3) 0 0;
  max-width: 44ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topics-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
  margin-top: var(--space-8);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-topics .topics-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-ink);
}

.page-topics .topics-stat--lead .topics-stat__num {
  color: var(--color-accent);
}

.page-topics .topics-stat__label {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.25;
  color: var(--color-ink-muted);
}

.page-topics .topics-hero__media {
  margin: 0;
  max-width: 100%;
}

.page-topics .topics-hero__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.page-topics .topics-chart {
  margin: var(--space-6) 0 0;
}

.page-topics .topics-chart__svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.page-topics .topics-chart__label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  fill: var(--color-ink-soft);
}

.page-topics .topics-chart__value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  fill: var(--color-ink);
}

.page-topics .topics-chart__bar {
  fill: var(--color-primary);
  opacity: 0.62;
}

.page-topics .topics-chart__bar--dim {
  opacity: 0.34;
}

.page-topics .topics-cap {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-ink-muted);
}

/* ---------- 目录 ---------- */

.page-topics .topics-directory {
  padding-top: var(--space-6);
}

.page-topics .topics-catbar {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-4);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-topics .topics-catbar::-webkit-scrollbar {
  display: none;
}

.page-topics .topics-catbar__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 2px solid var(--color-line);
  transition: color 200ms ease-out, border-color 200ms ease-out;
}

.page-topics .topics-catbar__link:hover,
.page-topics .topics-catbar__link:focus-visible {
  color: var(--color-ink);
  border-bottom-color: var(--color-primary);
}

.page-topics .topics-catbar__count {
  color: var(--color-accent);
}

.page-topics .topics-directory__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.page-topics .topics-toc {
  align-self: start;
}

.page-topics .topics-toc .toc__title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.page-topics .topics-toc .toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-topics .topics-toc .toc__link {
  display: block;
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color 200ms ease-out, background-color 200ms ease-out, box-shadow 200ms ease-out;
}

.page-topics .topics-toc .toc__link:hover {
  color: var(--color-ink);
  background-color: var(--color-surface-alt);
}

.page-topics .topics-toc .toc__link[aria-current="true"] {
  color: var(--color-ink);
  background-color: var(--color-primary-soft);
  box-shadow: inset 2px 0 0 var(--color-focus);
}

.page-topics .topics-group {
  scroll-margin-top: var(--space-8);
}

.page-topics .topics-group + .topics-group {
  margin-top: var(--space-8);
}

.page-topics .topics-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: var(--space-3);
  row-gap: var(--space-1);
  align-items: baseline;
  margin-bottom: var(--space-4);
}

.page-topics .topics-group__index {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.page-topics .topics-group__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-topics .topics-group__note {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 48ch;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

.page-topics .topics-group__media {
  margin: var(--space-4) 0 var(--space-6);
  max-width: 100%;
}

.page-topics .topics-group__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-topics .topics-group__media--square {
  max-width: 400px;
}

.page-topics .topics-group__media--inset {
  max-width: 520px;
}

.page-topics .topics-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-topics .topic-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: var(--space-3);
  row-gap: var(--space-1);
  padding: var(--space-3) var(--space-2);
  border-radius: var(--radius-md);
  transition: background-color 200ms ease-out;
}

.page-topics .topic-item:hover {
  background-color: var(--color-primary-soft);
}

.page-topics .topic-item__num {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-primary);
  padding-top: 0.3em;
}

.page-topics .topic-item__body {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.page-topics .topic-item__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.3;
  color: var(--color-ink);
}

.page-topics .topic-item__desc {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-soft);
}

.page-topics .topic-item__status {
  grid-column: 2;
  grid-row: 2;
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.25;
  color: var(--color-ink-muted);
  white-space: nowrap;
  cursor: help;
}

.page-topics .topic-item__status::before {
  content: "";
  flex: 0 0 auto;
  width: 0.42em;
  height: 0.42em;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}

/* ---------- 字段说明 ---------- */

.page-topics .topics-legend__intro {
  margin-top: var(--space-2);
  max-width: 52ch;
  color: var(--color-ink-muted);
}

.page-topics .topics-legend__list {
  display: grid;
  gap: var(--space-4);
  margin: var(--space-6) 0 0;
  padding: 0;
}

.page-topics .topics-legend__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-topics .topics-legend__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-topics .topics-legend__term {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-accent);
}

.page-topics .topics-legend__desc {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

/* ---------- 维护节奏（全页唯一强对比区块） ---------- */

.page-topics .topics-maint {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-topics .topics-maint__panel {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-4);
}

.page-topics .topics-maint__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-topics .topics-maint__text {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-topics .topics-maint__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-topics .topics-maint__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.15;
  color: var(--color-contrast-accent);
}

.page-topics .topics-maint__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-contrast-ink);
}

/* ---------- 延伸入口 ---------- */

.page-topics .topics-more__intro {
  margin-top: var(--space-2);
  max-width: 52ch;
  color: var(--color-ink-muted);
}

.page-topics .topics-more__list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
}

.page-topics .topics-more__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-3) 0;
}

.page-topics .topics-more__link {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  letter-spacing: 0.02em;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: border-color 200ms ease-out;
}

.page-topics .topics-more__link:hover,
.page-topics .topics-more__link:focus-visible {
  border-bottom-color: var(--color-accent);
}

.page-topics .topics-more__desc {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 断点 ---------- */

@media (min-width: 700px) {
  .page-topics .topics-legend__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-topics .topics-more__item {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-topics .topics-maint__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-topics .topics-hero__grid {
    grid-template-columns: var(--topics-index-col) minmax(0, 1fr) 240px;
    gap: var(--space-4);
  }

  .page-topics .topics-hero__index {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    font-size: var(--text-2xl);
    line-height: 1.12;
    letter-spacing: -0.02em;
  }

  .page-topics .topics-hero__index span:nth-child(n + 6) {
    opacity: 0.72;
  }

  .page-topics .topics-hero__index span:nth-child(n + 10) {
    opacity: 0.44;
  }

  .page-topics .topics-directory__grid {
    grid-template-columns: var(--topics-toc-col) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-topics .topics-toc {
    position: sticky;
    top: var(--space-6);
  }

  .page-topics .topics-toc .toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: var(--space-1);
  }

  .page-topics .topic-item {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: baseline;
  }

  .page-topics .topic-item__status {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
    padding-top: 0.35em;
  }

  .page-topics .topics-maint__panel {
    padding: var(--space-8) var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-topics .topic-item,
  .page-topics .topics-catbar__link,
  .page-topics .topics-more__link,
  .page-topics .topics-toc .toc__link {
    transition: none;
  }
}