.page-topics {
  --topics-chip-min: 108px;
  --topics-hairline: var(--border-thin);
}

/* ---------- 首屏 ---------- */
.page-topics .hero {
  position: relative;
  padding-top: var(--space-3);
  padding-bottom: var(--space-8);
  border-bottom: var(--topics-hairline) dashed var(--color-line);
}

.page-topics .hero-top {
  display: block;
}

.page-topics .hero-grid {
  display: grid;
  gap: var(--space-4);
  align-items: end;
  margin-top: var(--space-4);
}

.page-topics .hero-kicker {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.page-topics .hero-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-topics .hero-title-line {
  display: block;
}

.page-topics .hero-title-line:last-child {
  color: var(--color-ink-soft);
}

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

.page-topics .hero-figure {
  margin: 0;
}

.page-topics .hero-figure .media-frame {
  border: var(--topics-hairline) solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-topics .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-topics .hero-figures {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
  padding: var(--space-3) 0 0;
  border-top: var(--topics-hairline) dashed var(--color-line);
}

.page-topics .hero-figures .figure {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-topics .hero-figures .figure-value {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-topics .hero-figures .figure-label {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* ---------- 编号方块阵列 ---------- */
.page-topics .topic-matrix {
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--topics-hairline);
  background-color: var(--color-line);
  border: var(--topics-hairline) solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-topics .topic-chip {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: var(--topics-chip-min);
  padding: var(--space-2);
  background-color: var(--color-surface-alt);
  transition: background-color 0.18s ease, transform 0.18s ease;
}

.page-topics .topic-chip:hover,
.page-topics .topic-chip:focus-within {
  background-color: var(--color-primary-soft);
  outline: var(--topics-hairline) solid var(--color-accent);
  outline-offset: calc(-1 * var(--topics-hairline));
  z-index: 2;
}

.page-topics .chip-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-1);
}

.page-topics .chip-num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-topics .chip-group {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.page-topics .chip-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.3;
  color: var(--color-ink);
}

.page-topics .chip-preview {
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-soft);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.2s ease, opacity 0.2s ease;
}

.page-topics .topic-chip:hover .chip-preview,
.page-topics .topic-chip:focus-within .chip-preview {
  max-height: 6em;
  opacity: 1;
}

/* ---------- 分组定位条 ---------- */
.page-topics .jump-bar {
  padding-block: var(--space-3);
}

.page-topics .group-jump {
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  padding-bottom: var(--space-1);
  -webkit-overflow-scrolling: touch;
}

.page-topics .group-jump .seg-btn {
  flex: 0 0 auto;
  white-space: nowrap;
}

/* ---------- 分组通用 ---------- */
.page-topics .group {
  padding-block: var(--space-8);
  border-top: var(--topics-hairline) dashed var(--color-line);
}

.page-topics .group-head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.page-topics .group-num {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  line-height: 1;
  color: var(--color-primary);
}

.page-topics .group-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

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

.page-topics .group-count {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-topics .group-count-num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-topics .group-body {
  display: grid;
  gap: var(--space-4);
}

.page-topics .group-media {
  margin: 0;
}

.page-topics .group-media .media-frame {
  border: var(--topics-hairline) solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-topics .group-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ---------- 专题卡 ---------- */
.page-topics .topic-cards {
  display: grid;
  gap: var(--space-3);
}

.page-topics .topic-card {
  position: relative;
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border-top: var(--topics-hairline) solid var(--color-line);
  border-radius: var(--radius-md);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-topics .topic-card:hover,
.page-topics .topic-card:focus-within {
  border-top-color: var(--color-accent);
  transform: translateY(-2px);
}

.page-topics .topic-card--offset {
  background-color: var(--color-primary-soft);
  border-top-color: var(--color-primary);
}

.page-topics .topic-card-num {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

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

.page-topics .topic-card-lede {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topic-points {
  list-style: none;
  display: grid;
  gap: var(--space-1);
  margin: 0 0 var(--space-3);
  padding: 0;
}

.page-topics .topic-points li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.62;
  color: var(--color-ink-soft);
}

.page-topics .topic-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
}

.page-topics .topic-card-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--topics-hairline) dashed var(--color-line);
  font-size: var(--text-sm);
}

.page-topics .topic-card-foot a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--topics-hairline) solid currentColor;
  padding-bottom: 1px;
}

.page-topics .topic-card-foot a:hover,
.page-topics .topic-card-foot a:focus-visible {
  color: var(--color-focus);
}

/* ---------- 中段结论 ---------- */
.page-topics .insight {
  padding-block: var(--space-6);
  background-color: var(--color-surface-deep);
  border-top: var(--topics-hairline) solid var(--color-line);
  border-bottom: var(--topics-hairline) solid var(--color-line);
}

.page-topics .insight-inner {
  display: grid;
  gap: var(--space-2);
}

.page-topics .insight-text {
  max-width: var(--measure);
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: 1.36;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-topics .insight-note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 赛区与选手：宽卡横排 ---------- */
.page-topics .topic-cards--wide {
  gap: var(--space-3);
}

/* ---------- 延伸入口 ---------- */
.page-topics .group--index {
  padding-bottom: var(--section-y);
}

.page-topics .index-cta {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-3);
  background-color: var(--color-surface-alt);
  border: var(--topics-hairline) solid var(--color-line);
  border-radius: var(--radius-lg);
}

.page-topics .index-cta-kicker {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.page-topics .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-topics .outro-note {
  max-width: var(--measure);
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

.page-topics .outro-note a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--topics-hairline) solid currentColor;
}

.page-topics .outro-note a:hover,
.page-topics .outro-note a:focus-visible {
  color: var(--color-focus);
}

.page-topics a:focus-visible,
.page-topics [tabindex]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-topics .hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-topics .group-head {
    grid-template-columns: minmax(0, 2fr) minmax(0, 8fr) auto;
    align-items: start;
    gap: var(--space-2) var(--space-4);
  }

  .page-topics .group-count {
    justify-self: end;
    padding-top: var(--space-1);
  }

  .page-topics .index-cta {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-6) var(--space-4);
  }

  .page-topics .cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-topics .hero-top {
    padding-top: var(--space-3);
  }

  .page-topics .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-6);
  }

  .page-topics .topic-matrix {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    grid-auto-rows: minmax(132px, auto);
  }

  .page-topics .topic-chip:nth-child(1),
  .page-topics .topic-chip:nth-child(2) {
    grid-column: span 3;
    min-height: 156px;
  }

  .page-topics .topic-chip:nth-child(3),
  .page-topics .topic-chip:nth-child(4),
  .page-topics .topic-chip:nth-child(5) {
    grid-column: span 2;
  }

  .page-topics .topic-chip:nth-child(6),
  .page-topics .topic-chip:nth-child(7) {
    grid-column: span 3;
    min-height: 148px;
  }

  .page-topics .topic-chip:nth-child(8),
  .page-topics .topic-chip:nth-child(9),
  .page-topics .topic-chip:nth-child(10) {
    grid-column: span 2;
  }

  .page-topics .topic-chip:nth-child(11),
  .page-topics .topic-chip:nth-child(12),
  .page-topics .topic-chip:nth-child(13) {
    grid-column: span 2;
  }

  .page-topics .topic-chip {
    padding: var(--space-3);
  }

  .page-topics .group {
    padding-block: var(--section-y);
  }

  .page-topics .group-head {
    margin-bottom: var(--space-6);
  }

  .page-topics .group-body {
    gap: var(--space-6);
  }

  .page-topics .group--a .group-body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-topics .group--b .group-body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-topics .group--b .group-media {
    order: 2;
  }

  .page-topics .group--c .group-body {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .page-topics .group--e .group-body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-topics .topic-cards--wide {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
    gap: var(--space-4);
  }

  .page-topics .topic-card--offset {
    margin-top: var(--space-6);
  }

  .page-topics .insight-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-6);
    align-items: end;
  }
}

@media (min-width: 1160px) {
  .page-topics .group--c .topic-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .page-topics .group--c .topic-card:first-child {
    grid-column: span 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-topics .topic-chip,
  .page-topics .topic-card,
  .page-topics .chip-preview {
    transition: none;
  }

  .page-topics .topic-card:hover,
  .page-topics .topic-card:focus-within {
    transform: none;
  }
}