.page-topics {
  display: block;
  font-family: var(--font-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
}

.page-topics .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-topics .topics-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: var(--space-8) 0 var(--space-6);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-topics .topics-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  margin: 0;
}

.page-topics .topics-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
}

.page-topics .topics-hero__scrim {
  position: absolute;
  inset: 0;
  display: block;
  background: var(--overlay-scrim);
}

.page-topics .topics-hero__inner {
  position: relative;
  z-index: 1;
}

.page-topics .topics-hero .section__label {
  color: var(--color-contrast-ink);
  opacity: 0.68;
}

.page-topics .topics-hero__title {
  margin: var(--space-2) 0 var(--space-3);
  max-width: 16ch;
  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 .topics-hero__lede {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

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

.page-topics .topics-figure__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.012em;
  color: var(--color-contrast-ink);
}

.page-topics .topics-figure:first-child .topics-figure__value {
  color: var(--color-contrast-accent);
}

.page-topics .topics-figure__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-contrast-ink);
  opacity: 0.6;
}

.page-topics .topics-hero__axis {
  margin-top: var(--space-6);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
}

.page-topics .topics-axis {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
}

.page-topics .topics-axis__line {
  stroke: var(--color-contrast-line);
  stroke-width: 1;
}

.page-topics .topics-axis__pt {
  fill: var(--color-contrast-surface);
  stroke: var(--color-contrast-line);
  stroke-width: 1.5;
}

.page-topics .topics-axis__pt.is-current {
  fill: var(--color-focus);
  stroke: var(--color-focus);
}

.page-topics .topics-axis__label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  fill: var(--color-contrast-ink);
  opacity: 0.55;
}

.page-topics .topics-axis__label.is-current {
  opacity: 1;
  fill: var(--color-focus);
}

/* ---------- 族群索引 ---------- */
.page-topics .topics-tribes {
  padding: var(--section-y) 0;
  background-color: var(--color-surface);
}

.page-topics .topics-tribes__head {
  max-width: var(--measure);
}

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

.page-topics .topics-tribes__list {
  display: grid;
  margin-top: var(--space-6);
  border-top: 1px solid var(--color-line);
}

.page-topics .topics-tribe {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "head count"
    "desc desc"
    "shape shape";
  gap: var(--space-1) var(--space-3);
  padding: var(--space-4) var(--space-2) var(--space-4) 0;
  color: inherit;
  text-decoration: none;
  transition: background-color 180ms ease-out, padding-left 180ms ease-out;
}

.page-topics .topics-tribe::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background-color: var(--color-line);
}

.page-topics .topics-tribe:nth-child(2)::after {
  left: 16%;
}

.page-topics .topics-tribe:nth-child(3)::after {
  left: 7%;
}

.page-topics .topics-tribe:nth-child(4)::after {
  left: 27%;
}

.page-topics .topics-tribe:hover,
.page-topics .topics-tribe:focus-visible {
  background-color: var(--color-surface-alt);
  padding-left: var(--space-2);
  outline: 2px solid var(--color-focus);
  outline-offset: -2px;
}

.page-topics .topics-tribe__head {
  grid-area: head;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
}

.page-topics .topics-tribe__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-topics .topics-tribe__name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-topics .topics-tribe__count {
  grid-area: count;
  align-self: start;
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
}

.page-topics .topics-tribe__digit {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-primary);
}

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

.page-topics .topics-tribe__desc {
  grid-area: desc;
  max-width: 68ch;
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topics-tribe__shape {
  grid-area: shape;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

/* ---------- 图片横幅 ---------- */
.page-topics .topics-banner {
  padding: var(--space-8) 0;
  background-color: var(--color-surface-alt);
}

.page-topics .topics-banner__title {
  margin: 0 0 var(--space-4);
  max-width: 34ch;
  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 .topics-banner__figure {
  margin: 0;
}

.page-topics .topics-banner__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 专题目录 ---------- */
.page-topics .topics-catalog {
  padding: var(--section-y-lg) 0 var(--section-y);
  background-color: var(--color-surface);
}

.page-topics .topics-catalog__head {
  max-width: var(--measure);
}

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

.page-topics .topics-catalog__note a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-topics .topics-catalog__scroller {
  margin-top: var(--space-6);
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: var(--space-4);
  cursor: grab;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-topics .topics-catalog__scroller.is-dragging {
  cursor: grabbing;
}

.page-topics .topics-catalog__scroller:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

.page-topics .topics-track {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  width: max-content;
  min-width: 100%;
}

.page-topics .topics-col {
  flex: 0 0 min(82vw, 320px);
  width: min(82vw, 320px);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.page-topics .topics-col:nth-child(even) {
  margin-top: var(--space-4);
  background-color: var(--color-surface);
}

.page-topics .topics-col__head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: var(--space-1) var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-line);
}

.page-topics .topics-col__num {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-topics .topics-col__name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

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

.page-topics .topics-col__desc {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topics-entries {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-topics .topics-entry {
  position: relative;
  padding: var(--space-2);
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  transition: border-color 180ms ease-out, box-shadow 180ms ease-out;
}

.page-topics .topics-col:nth-child(even) .topics-entry {
  background-color: var(--color-surface-alt);
}

.page-topics .topics-entry:hover,
.page-topics .topics-entry:focus-within {
  border-color: var(--color-focus);
  box-shadow: var(--shadow-1);
}

.page-topics .topics-entry__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
  margin-bottom: var(--space-1);
}

.page-topics .topics-entry__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-topics .topics-entry__tribe {
  padding: 2px var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-sm);
}

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

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

.page-topics .topics-entry__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-1) var(--space-2);
  margin: var(--space-2) 0 0;
  padding-top: var(--space-2);
  border-top: 1px dashed var(--color-line);
}

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

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

.page-topics .topics-entry__field dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-topics .topics-entry__pop {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 6;
  margin: var(--space-1) 0 0;
  padding: var(--space-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  background-color: var(--color-contrast-surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 180ms ease-out, transform 180ms ease-out, visibility 180ms;
  pointer-events: none;
}

.page-topics .topics-entry:hover .topics-entry__pop,
.page-topics .topics-entry:focus-within .topics-entry__pop {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 赛季轴说明 ---------- */
.page-topics .topics-axis-note {
  padding: var(--section-y) 0;
  background-color: var(--color-surface-deep);
}

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

.page-topics .topics-axis-note__body .section__title {
  max-width: 30ch;
  margin-top: var(--space-2);
}

.page-topics .topics-axis-note__list {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-topics .topics-axis-note__list li {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface);
  border-left: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.page-topics .topics-axis-note__k {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-topics .topics-axis-note__v {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-topics .topics-axis-note__ref {
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topics-axis-note__ref a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-topics .topics-axis-note__media {
  margin: 0;
}

.page-topics .topics-axis-note__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 维护规则 ---------- */
.page-topics .topics-rules {
  padding: var(--section-y) 0 var(--section-y-lg);
  background-color: var(--color-surface-alt);
}

.page-topics .topics-rules__head {
  max-width: var(--measure);
}

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

.page-topics .topics-rules__steps {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-topics .topics-rule {
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.page-topics .topics-rule__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-topics .topics-rule__title {
  margin: var(--space-1) 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-topics .topics-rule__text {
  margin: 0;
  max-width: 70ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topics-rules__media {
  margin: 0;
}

.page-topics .topics-rules__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-topics .topics-rules__ref {
  margin: var(--space-6) 0 0;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topics-rules__ref a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-topics .topics-rules__ref a + a {
  margin-left: var(--space-1);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-topics .topics-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-topics .topics-axis-note__inner {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: var(--space-8);
  }

  .page-topics .topics-rules__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
  }

  .page-topics .topics-col {
    flex: 0 0 292px;
    width: 292px;
  }
}

@media (min-width: 1025px) {
  .page-topics .topics-hero {
    padding: var(--section-y-lg) 0 var(--space-8);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-topics .topics-tribe,
  .page-topics .topics-entry,
  .page-topics .topics-entry__pop {
    transition: none;
  }

  .page-topics .topics-entry__pop {
    transform: none;
  }
}