.page-topics {
  --tp-axis-offset: 3px;
  --tp-node-size: 9px;
}

.page-topics .tp-crumb {
  padding-top: var(--space-3);
}

/* ===== 首屏 ===== */
.page-topics .tp-hero {
  padding: var(--space-3) 0 var(--section-y);
}

.page-topics .tp-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-topics .tp-hero__panel {
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-topics .tp-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-primary-soft);
}

.page-topics .tp-hero__title {
  margin: var(--space-2) 0 var(--space-3);
  max-width: 12ch;
  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-contrast-ink);
}

.page-topics .tp-hero__lede {
  margin: 0 0 var(--space-4);
  max-width: 46ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.page-topics .tp-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  margin: auto 0 0;
  padding: var(--space-3) 0 0;
  list-style: none;
  border-top: 1px dotted var(--color-contrast-line);
}

.page-topics .tp-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-topics .tp-hero__num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-contrast-ink);
}

.page-topics .tp-hero__unit {
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-topics .tp-hero__media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-contrast-surface);
}

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

.page-topics .tp-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.page-topics .tp-hero__nodes {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-3) var(--space-2);
}

.page-topics .tp-hero__node {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: border-color 140ms ease, background-color 140ms ease;
}

.page-topics .tp-hero__node:hover,
.page-topics .tp-hero__node:focus-visible {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-contrast-surface) 60%, transparent);
}

.page-topics .tp-hero__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--color-primary);
}

.page-topics .tp-hero__nodeno {
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.page-topics .tp-hero__nodelabel {
  flex: 1;
}

/* ===== 分组与横带 ===== */
.page-topics .tp-group {
  padding-top: var(--section-y);
}

.page-topics .tp-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
  border-bottom: 1px dotted var(--color-line);
}

.page-topics .tp-band__index {
  display: block;
  font-size: var(--text-4xl);
  line-height: 1;
  color: var(--color-primary);
}

.page-topics .tp-band__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-ink);
}

.page-topics .tp-band__desc {
  margin: 4px 0 0;
  max-width: 56ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .tp-band__meta {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-topics .tp-band__figure {
  margin: 0 0 var(--space-4);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-contrast-surface);
}

.page-topics .tp-band__figure--narrow {
  max-width: 560px;
}

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

.page-topics .tp-band__side {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-contrast-surface);
}

/* ===== 纵向轴线与专题块 ===== */
.page-topics .tp-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-topics .tp-topic {
  position: relative;
  margin-left: var(--tp-axis-offset);
  padding: 0 0 var(--space-4) var(--space-4);
  border-left: 1px dotted var(--color-line);
}

.page-topics .tp-topic::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 9px;
  width: var(--tp-node-size);
  height: var(--tp-node-size);
  border-radius: 50%;
  background: var(--color-primary);
  transform: translateX(-50%);
}

.page-topics .tp-topic__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: 6px;
}

.page-topics .tp-topic__code {
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

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

.page-topics .tp-topic__figure {
  margin: 0 0 var(--space-2);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-contrast-surface);
}

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

.page-topics .tp-topic__lede {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .tp-points {
  display: grid;
  gap: 6px;
  margin: 0 0 var(--space-2);
  padding: 0;
  max-width: var(--measure);
  list-style: none;
}

.page-topics .tp-points li {
  position: relative;
  padding: 7px 10px 7px 26px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

.page-topics .tp-points li::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 13px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--color-primary);
}

.page-topics .tp-points li.is-warn {
  background: var(--color-highlight);
  color: var(--color-ink);
}

.page-topics .tp-points li.is-warn::before {
  background: var(--color-accent);
}

.page-topics .tp-topic__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  max-width: var(--measure);
}

.page-topics .tp-topic__more {
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
  padding-bottom: 1px;
  transition: background-color 140ms ease, border-color 140ms ease;
}

.page-topics .tp-topic__more:hover,
.page-topics .tp-topic__more:focus-visible {
  background: var(--color-primary-soft);
  border-bottom-color: transparent;
}

/* ===== 交叉索引表 ===== */
.page-topics .tp-group--cross {
  padding-bottom: var(--section-y);
}

.page-topics .tp-cross__wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.page-topics .tp-cross {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-topics .tp-cross caption {
  caption-side: top;
  padding: var(--space-2);
  text-align: left;
  background: var(--color-surface-alt);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  border-bottom: 1px dotted var(--color-line);
}

.page-topics .tp-cross th,
.page-topics .tp-cross td {
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px dotted var(--color-line);
}

.page-topics .tp-cross thead th {
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.page-topics .tp-cross tbody tr:nth-child(even) {
  background: var(--color-surface-alt);
}

.page-topics .tp-cross tbody tr:last-child th,
.page-topics .tp-cross tbody tr:last-child td {
  border-bottom: 0;
}

.page-topics .tp-cross tbody th {
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-primary);
  white-space: nowrap;
}

.page-topics .tp-cross a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
}

.page-topics .tp-cross a:hover,
.page-topics .tp-cross a:focus-visible {
  background: var(--color-primary-soft);
  border-bottom-color: transparent;
}

/* ===== 桌面端 ===== */
@media (min-width: 900px) {
  .page-topics .tp-hero {
    padding-top: var(--space-4);
  }

  .page-topics .tp-hero__grid {
    grid-template-columns: minmax(0, 2.05fr) minmax(0, 1fr);
    gap: var(--space-4);
  }

  .page-topics .tp-hero__panel {
    padding: var(--space-6);
  }

  .page-topics .tp-hero__media {
    height: 100%;
  }

  .page-topics .tp-hero__media img {
    height: 100%;
    object-fit: cover;
  }

  .page-topics .tp-band {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: start;
    gap: var(--space-3);
  }

  .page-topics .tp-band__meta {
    padding-top: 0.75em;
    white-space: nowrap;
  }

  .page-topics .tp-band--media {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: start;
    gap: var(--space-4);
  }

  .page-topics .tp-band--plain {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-topics .tp-topic {
    padding-left: var(--space-6);
  }

  .page-topics .tp-topic__title {
    font-size: var(--text-xl);
  }
}
</final>