.page-topics {
  --topics-row-gap: 2px;
  --topics-num-col: 3.6em;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-topics .topics-hero {
  padding-top: var(--space-6);
  padding-bottom: var(--section-y);
}

.page-topics .topics-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-topics .topics-hero-main {
  min-width: 0;
}

.page-topics .topics-hero-main h1 {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.06;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-2) 0 var(--space-3);
}

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

.page-topics .topics-counts {
  display: flex;
  align-items: baseline;
  gap: var(--space-6);
  margin: var(--space-6) 0 var(--space-4);
  padding-left: var(--space-3);
  position: relative;
}

.page-topics .topics-counts::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
}

.page-topics .topics-count {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
}

.page-topics .topics-count--sub {
  transform: translateY(0.16em);
}

.page-topics .topics-count .figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  line-height: 1;
}

.page-topics .topics-count--sub .figure {
  color: var(--color-accent);
}

.page-topics .topics-count-label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
}

.page-topics .topics-preview {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--topics-row-gap);
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  font-size: var(--text-sm);
}

.page-topics .topics-preview li {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  min-width: 0;
  padding: 5px var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  transition: background-color 140ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-topics .topics-preview li:hover {
  background: var(--color-primary-soft);
  color: var(--color-ink);
}

.page-topics .topics-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  flex: 0 0 3.4em;
}

.page-topics .topics-hero-media {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-contrast-surface);
  box-shadow: var(--shadow-2);
}

.page-topics .topics-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-topics .topics-hero-media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-6) var(--space-3) var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  line-height: 1.5;
  letter-spacing: 0.02em;
}

/* ---------- 筛选与跳转 ---------- */
.page-topics .topics-toolbar {
  padding: 0 0 var(--space-6);
}

.page-topics .topics-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding-bottom: var(--space-3);
}

.page-topics .tag-filter[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-topics .topics-jump {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-3);
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.page-topics .topics-jump a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
}

.page-topics .topics-jump a:hover {
  color: var(--color-primary);
}

.page-topics .topics-jump .topics-num {
  flex: none;
  color: var(--color-primary);
  font-weight: var(--weight-heading);
}

/* ---------- 分组 ---------- */
.page-topics .topics-group {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
}

.page-topics .topics-group--alt {
  background: var(--color-surface-alt);
}

.page-topics .topics-group--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

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

.page-topics .topics-group-head h2 {
  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);
  margin: var(--space-1) 0 var(--space-3);
}

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

.page-topics .topics-group-note a,
.page-topics .topics-item-desc a,
.page-topics .topics-rule-body a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary-soft);
}

.page-topics .topics-group-note a:hover,
.page-topics .topics-item-desc a:hover,
.page-topics .topics-rule-body a:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

.page-topics .topics-group-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

.page-topics .topics-group-head,
.page-topics .topics-list,
.page-topics .topics-aside {
  min-width: 0;
}

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

.page-topics .topics-item {
  display: grid;
  grid-template-columns: var(--topics-num-col) minmax(0, 1fr);
  gap: 0 var(--space-3);
  padding: var(--space-3) var(--space-2);
  border-radius: var(--radius-md);
  transition: background-color 150ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-topics .topics-item + .topics-item {
  margin-top: var(--topics-row-gap);
}

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

.page-topics .topics-item-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-primary);
  padding-top: 3px;
}

.page-topics .topics-item-body {
  min-width: 0;
}

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

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

.page-topics .topics-item-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  line-height: 1.7;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-topics .topics-item-desc {
  margin: 5px 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: 62ch;
}

.page-topics .topics-item-more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
  transition: max-height 180ms cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 180ms cubic-bezier(0.22, 0.61, 0.36, 1),
              margin-top 180ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-topics .topics-item:hover .topics-item-more,
.page-topics .topics-item:focus-within .topics-item-more {
  max-height: 7em;
  opacity: 1;
  margin-top: var(--space-1);
}

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

.page-topics .topics-group-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-contrast-surface);
  box-shadow: var(--shadow-1);
}

.page-topics .topics-group-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

/* ---------- 深底分组 ---------- */
.page-topics .topics-group--deep .topics-group-head h2 {
  color: var(--color-contrast-ink);
}

.page-topics .topics-group--deep .eyebrow {
  color: var(--color-contrast-accent);
}

.page-topics .topics-group--deep .topics-group-note {
  color: var(--color-contrast-ink);
  opacity: 0.76;
}

.page-topics .topics-group--deep .topics-item-num {
  color: var(--color-contrast-accent);
}

.page-topics .topics-group--deep .topics-item-title {
  color: var(--color-contrast-ink);
}

.page-topics .topics-group--deep .topics-item-desc {
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

.page-topics .topics-group--deep .topics-item-more {
  color: var(--color-contrast-ink);
  opacity: 0.55;
}

.page-topics .topics-group--deep .topics-item:hover,
.page-topics .topics-group--deep .topics-item:focus-within {
  background: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
}

.page-topics .topics-group--deep .topics-item:hover .topics-item-more,
.page-topics .topics-group--deep .topics-item:focus-within .topics-item-more {
  opacity: 0.72;
}

.page-topics .topics-group--deep .topics-item-tag {
  background: color-mix(in srgb, var(--color-contrast-accent) 16%, transparent);
  color: var(--color-contrast-accent);
}

.page-topics .topics-group--deep .topics-group-figure {
  box-shadow: none;
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
}

/* ---------- 观赛指引侧栏 ---------- */
.page-topics .topics-aside {
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.page-topics .topics-aside-kicker {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

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

.page-topics .topics-aside-list li {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr);
  gap: var(--space-1);
  align-items: baseline;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-contrast-ink);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-topics .topics-aside-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-topics .topics-aside-list .topics-num {
  flex: none;
  color: var(--color-contrast-accent);
}

/* ---------- 更新与归档规则 ---------- */
.page-topics .topics-rules {
  background: var(--color-surface-alt);
  padding-top: var(--section-y-lg);
  padding-bottom: var(--section-y-lg);
}

.page-topics .topics-rules-head {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

.page-topics .topics-rules-head h2 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-1) 0 var(--space-3);
}

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

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

.page-topics .topics-rule {
  display: grid;
  grid-template-columns: 2.8em minmax(0, 1fr);
  gap: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-1);
}

.page-topics .topics-rule-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.5;
}

.page-topics .topics-rule-body h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: var(--color-ink);
}

.page-topics .topics-rule-body p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
  max-width: 68ch;
}

.page-topics .topics-rule-action {
  margin-top: var(--space-2) !important;
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-highlight);
  background: var(--color-highlight);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding-top: var(--space-1);
  padding-bottom: var(--space-1);
  padding-right: var(--space-2);
  color: var(--color-ink) !important;
}

/* ---------- 动效 ---------- */
.page-topics [data-reveal] {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 200ms cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 200ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-topics [data-reveal="shown"] {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-topics .topics-preview {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: repeat(9, auto);
    grid-auto-flow: column;
    column-gap: var(--space-6);
  }

  .page-topics .topics-hero-media img {
    aspect-ratio: 3 / 4;
  }

  .page-topics .topics-rule-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4) var(--space-4);
  }

  .page-topics .topics-rule:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-topics {
    --topics-num-col: 4.4em;
  }

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

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

  .page-topics .topics-hero-media {
    height: 100%;
  }

  .page-topics .topics-hero-media img {
    aspect-ratio: auto;
    height: 100%;
    min-height: 520px;
  }

  .page-topics .topics-group-body {
    grid-template-columns: minmax(0, 7.4fr) minmax(0, 4.6fr);
    gap: var(--space-8);
  }

  .page-topics #group-t .topics-group-body,
  .page-topics #group-g .topics-group-body {
    grid-template-columns: minmax(0, 7.4fr) minmax(0, 4.6fr);
  }

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

  .page-topics .topics-toolbar {
    padding-bottom: var(--section-y);
  }
}

@media (min-width: 1180px) {
  .page-topics .topics-rule-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-topics .topics-rule:last-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-topics [data-reveal],
  .page-topics [data-reveal="shown"] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-topics .topics-item,
  .page-topics .topics-item-more,
  .page-topics .topics-preview li {
    transition: none;
  }
}