.page-topics-index {
  background: var(--color-surface);
  color: var(--color-ink);
  overflow-x: hidden;
}

.page-topics-index .tp-crumb {
  padding-top: var(--space-6);
}

.page-topics-index .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-topics-index .breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-2);
  color: var(--color-ink-muted);
}

.page-topics-index .breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
}

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

/* ---------- 开篇 ---------- */

.page-topics-index .tp-opener {
  padding-bottom: var(--space-6);
}

.page-topics-index .tp-opener__inner {
  display: grid;
  gap: var(--space-3);
}

.page-topics-index .tp-opener__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: clamp(var(--text-lg), 5.6vw, var(--text-2xl));
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  max-width: 18ch;
}

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

.page-topics-index .tp-facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
  margin: var(--space-3) 0 0;
  padding: var(--space-4) 0 0;
  list-style: none;
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-topics-index .tp-facts li {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-topics-index .tp-facts__num {
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
}

/* ---------- 暗底走势条带 ---------- */

.page-topics-index .tp-band {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--section-y) 0;
  margin-top: var(--space-6);
}

.page-topics-index .tp-band__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-topics-index .tp-band__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  display: block;
}

.page-topics-index .tp-band::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--overlay-scrim);
}

.page-topics-index .tp-band__head {
  display: grid;
  gap: var(--space-2);
  border-top: var(--border-thick) solid var(--color-contrast-accent);
  padding-top: var(--space-3);
}

.page-topics-index .tp-band__title {
  margin: 0;
  color: var(--color-contrast-ink);
}

.page-topics-index .tp-band__note {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-topics-index .tp-chart {
  display: block;
  width: 100%;
  height: auto;
  margin: var(--space-6) 0 var(--space-4);
}

.page-topics-index .tp-chart__base {
  stroke: var(--color-contrast-line);
  stroke-width: 1.5;
  stroke-dasharray: 8 8;
}

.page-topics-index .tp-chart__line {
  fill: none;
  stroke: var(--color-contrast-accent);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-topics-index .tp-chart__dots circle {
  fill: var(--color-contrast-surface);
  stroke: var(--color-contrast-accent);
  stroke-width: 3;
}

.page-topics-index .tp-chart__labels text {
  fill: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  letter-spacing: 0.08em;
  text-anchor: middle;
}

.page-topics-index .tp-strip {
  border-top: var(--border-thick) solid var(--color-contrast-line);
  padding-top: var(--space-3);
}

.page-topics-index .tp-strip__nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-3);
}

.page-topics-index .tp-strip__label {
  color: var(--color-contrast-ink);
}

.page-topics-index .tp-strip__pos {
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-accent);
  margin-right: auto;
}

.page-topics-index .tp-strip__btn {
  min-width: 44px;
  min-height: 44px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}

.page-topics-index .tp-strip__btn:hover {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-accent);
}

.page-topics-index .tp-strip__btn:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

.page-topics-index .tp-strip__track {
  display: flex;
  gap: var(--space-3);
  margin: 0;
  padding: 0 0 var(--space-3);
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-topics-index .tp-slice {
  flex: 0 0 clamp(150px, 42vw, 220px);
  scroll-snap-align: start;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-contrast-surface) 82%, transparent);
}

.page-topics-index .tp-slice__num {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  color: var(--color-contrast-accent);
}

.page-topics-index .tp-slice .data-label {
  color: var(--color-contrast-ink);
}

/* ---------- 逐赛季明细 ---------- */

.page-topics-index .tp-seasons__head {
  border-top: var(--border-thick) solid var(--color-ink);
  padding-top: var(--space-3);
}

.page-topics-index .tp-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-4) 0 var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-topics-index .tp-filter__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-topics-index .tp-season-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-topics-index .tp-season {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-6) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color 150ms ease;
}

.page-topics-index .tp-season:hover {
  background: var(--color-primary-soft);
}

.page-topics-index .tp-season__marker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.page-topics-index .tp-season__no {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  padding: var(--space-1) var(--space-2);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
}

.page-topics-index .tp-season__chip {
  background: var(--color-highlight);
  color: var(--color-accent);
}

.page-topics-index .tp-season__body {
  display: grid;
  gap: var(--space-3);
}

.page-topics-index .tp-season__name {
  margin: 0;
}

.page-topics-index .tp-season__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-4);
  margin: 0;
}

.page-topics-index .tp-season__stats > div {
  display: grid;
  gap: 2px;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-topics-index .tp-season__stats dt {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.page-topics-index .tp-season__stats dd {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  color: var(--color-ink);
}

.page-topics-index .tp-season__note {
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.page-topics-index .tp-season__note summary {
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  padding: var(--space-1) 0;
}

.page-topics-index .tp-season__note summary:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

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

/* ---------- 口径条目 ---------- */

.page-topics-index .tp-caliber {
  background: var(--color-surface-alt);
  padding: var(--section-y) 0;
}

.page-topics-index .tp-caliber__head {
  border-top: var(--border-thick) solid var(--color-ink);
  padding-top: var(--space-3);
}

.page-topics-index .tp-caliber__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-topics-index .tp-caliber__item {
  display: grid;
  gap: var(--space-2);
  align-content: start;
  border-top: var(--border-thick) solid var(--color-primary);
  padding: var(--space-4);
  background: var(--color-surface);
}

.page-topics-index .tp-caliber__tag {
  justify-self: start;
}

.page-topics-index .tp-caliber__name {
  margin: 0;
}

.page-topics-index .tp-caliber__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics-index .tp-caliber__stats {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-2) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-topics-index .tp-caliber__stats > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-3);
}

.page-topics-index .tp-caliber__stats dt {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-topics-index .tp-caliber__stats dd {
  margin: 0;
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

/* ---------- 城市分布 ---------- */

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

.page-topics-index .tp-cities__lede {
  margin: var(--space-3) 0 0;
  color: var(--color-ink-soft);
}

.page-topics-index .tp-cities__list {
  display: grid;
  gap: 0;
  margin: var(--space-4) 0 0;
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-topics-index .tp-cities__row {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-topics-index .tp-cities__row dt {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

.page-topics-index .tp-cities__row dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics-index .tp-cities__row .num {
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-topics-index .tp-cities__figure {
  margin: 0;
}

.page-topics-index .tp-cities__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 引用与相邻入口 ---------- */

.page-topics-index .tp-cite {
  background: var(--color-surface-deep);
  padding: var(--section-y) 0;
}

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

.page-topics-index .tp-cite__text p {
  margin: var(--space-3) 0 0;
}

.page-topics-index .tp-cite__rules {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thick) solid var(--color-primary);
}

.page-topics-index .tp-cite__rules li {
  position: relative;
  padding: var(--space-3) 0 var(--space-3) var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics-index .tp-cite__rules li::before {
  content: "■";
  position: absolute;
  left: 0;
  top: var(--space-3);
  color: var(--color-accent);
  font-size: var(--text-xs);
}

.page-topics-index .tp-cite__aside {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.page-topics-index .tp-cite__figure {
  margin: 0;
}

.page-topics-index .tp-cite__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-topics-index .tp-cite__links-title {
  margin: 0;
  padding-top: var(--space-3);
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-topics-index .tp-cite__links {
  margin: 0;
  padding: 0;
}

.page-topics-index .tp-cite__links .entry {
  padding: var(--space-3) 0;
}

.page-topics-index .tp-cite__links .entry__title {
  font-size: var(--text-base);
}

/* ---------- 断点 ---------- */

@media (min-width: 680px) {
  .page-topics-index .tp-season__stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-topics-index .tp-caliber__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-topics-index .tp-opener__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 2fr);
    align-items: end;
    gap: var(--gutter);
  }

  .page-topics-index .tp-opener__inner .data-label {
    grid-column: 1 / -1;
  }

  .page-topics-index .tp-opener__lede {
    grid-column: 1 / 2;
  }

  .page-topics-index .tp-facts {
    grid-column: 2 / 3;
    margin: 0;
    padding-top: 0;
    border-top: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .page-topics-index .tp-season {
    grid-template-columns: minmax(0, 2fr) minmax(0, 5fr);
    gap: var(--gutter);
  }

  .page-topics-index .tp-caliber__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-topics-index .tp-cities__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 3fr);
    gap: var(--gutter);
  }

  .page-topics-index .tp-cite__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 3fr);
    gap: var(--gutter);
  }
}

@media (min-width: 1200px) {
  .page-topics-index .tp-cities__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 2fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-topics-index .tp-strip__btn,
  .page-topics-index .tp-season {
    transition: none;
  }
}