.page-topics {
  --tp-pad: clamp(20px, 4vw, 32px);
}

.page-topics img {
  max-width: 100%;
}

/* ---------- 面包屑 ---------- */
.page-topics .topics-crumbs {
  padding-top: var(--space-6);
}

.page-topics .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-topics .breadcrumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
}

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

.page-topics .breadcrumbs__sep {
  color: var(--color-line);
}

/* ---------- 通用文字组件 ---------- */
.page-topics .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-topics .eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.page-topics .section {
  padding-block: clamp(48px, 7vw, var(--section-y));
}

.page-topics .section__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.page-topics .section__title {
  margin: var(--space-2) 0 0;
  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 .section__meta {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-muted);
}

@media (min-width: 860px) {
  .page-topics .section__head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-6);
    align-items: end;
  }

  .page-topics .section__meta {
    justify-self: end;
    text-align: right;
    max-width: 38ch;
  }
}

/* ---------- 首屏 ---------- */
.page-topics .topics-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.page-topics .topics-hero__shards {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-topics .topics-hero__shards span {
  position: absolute;
  display: block;
  height: 18px;
  transform: skewY(-9deg);
  background: color-mix(in srgb, var(--color-surface-alt) 80%, transparent);
}

.page-topics .topics-hero__shards span:nth-child(1) {
  top: 7%;
  left: -8%;
  width: 66%;
}

.page-topics .topics-hero__shards span:nth-child(2) {
  top: 21%;
  left: 14%;
  width: 72%;
  background: color-mix(in srgb, var(--color-primary-soft) 72%, transparent);
}

.page-topics .topics-hero__shards span:nth-child(3) {
  top: 37%;
  left: -14%;
  width: 54%;
  background: color-mix(in srgb, var(--color-surface-deep) 62%, transparent);
}

.page-topics .topics-hero__shards span:nth-child(4) {
  top: 55%;
  left: 6%;
  width: 78%;
  background: color-mix(in srgb, var(--color-surface-alt) 60%, transparent);
}

.page-topics .topics-hero__shards span:nth-child(5) {
  top: 74%;
  left: -6%;
  width: 60%;
  background: color-mix(in srgb, var(--color-primary-soft) 52%, transparent);
}

.page-topics .topics-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-block: var(--space-8) var(--space-6);
}

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

.page-topics .topics-hero__lede {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topics-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 14 / 9;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  background: var(--color-surface-deep);
}

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

.page-topics .topics-hero__media .media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-topics .topics-hero__media .media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
}

@media (min-width: 900px) {
  .page-topics .topics-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: var(--space-8);
    padding-block: var(--space-8);
  }
}

/* ---------- 首屏大数字 ---------- */
.page-topics .topics-hero__figures {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-block: var(--space-6) var(--space-8);
  border-top: 1px solid var(--color-line);
}

.page-topics .topics-figure {
  display: flex;
  flex-direction: column;
}

.page-topics .topics-figure .figure-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-ink);
}

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

.page-topics .topics-figure__label {
  margin-top: var(--space-2);
  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-figure__note {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

@media (min-width: 720px) {
  .page-topics .topics-hero__figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
    align-items: start;
    padding-block: var(--space-6) var(--space-8);
  }

  .page-topics .topics-hero__figures::before {
    content: "";
    position: absolute;
    left: -3%;
    right: -3%;
    top: 34%;
    height: 1px;
    background: var(--color-line);
    transform: rotate(-7deg);
    transform-origin: left center;
  }

  .page-topics .topics-figure:nth-child(2) {
    margin-top: var(--space-4);
  }

  .page-topics .topics-figure:nth-child(3) {
    margin-top: var(--space-8);
  }
}

/* ---------- 分类刻度 ---------- */
.page-topics .cate-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-line);
}

.page-topics .cate-all {
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color 220ms ease, color 220ms ease, border-color 220ms ease;
}

.page-topics .cate-all[aria-pressed="true"] {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

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

.page-topics .cate-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-topics .cate-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .page-topics .cate-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-topics .cate-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
  }
}

.page-topics .cate {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3);
  text-align: left;
  font: inherit;
  color: var(--color-ink);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 240ms ease, border-color 240ms ease, color 240ms ease;
}

.page-topics .cate:hover,
.page-topics .cate:focus-visible {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  outline: none;
}

.page-topics .cate:focus-visible {
  box-shadow: 0 0 0 2px var(--color-focus);
}

.page-topics .cate[aria-pressed="true"] {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.page-topics .cate__ticks {
  display: block;
  width: 72px;
  height: 6px;
  opacity: 0.55;
  color: currentColor;
}

.page-topics .cate__ticks line {
  stroke: currentColor;
  stroke-width: 1;
}

.page-topics .cate__idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.page-topics .cate__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-topics .cate__desc {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-topics .cate__media {
  display: block;
  width: 100%;
  height: 132px;
  margin-top: auto;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
}

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

.page-topics .cate__stat {
  width: 100%;
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-topics .cate[aria-pressed="true"] .cate__idx,
.page-topics .cate[aria-pressed="true"] .cate__desc,
.page-topics .cate[aria-pressed="true"] .cate__stat {
  color: var(--color-contrast-ink);
}

.page-topics .cate[aria-pressed="true"] .cate__desc {
  opacity: 0.78;
}

.page-topics .cate[aria-pressed="true"] .cate__stat {
  border-top-color: var(--color-contrast-line);
}

.page-topics .cate[aria-pressed="true"] .cate__media {
  border-color: var(--color-contrast-line);
}

/* ---------- 专题条目 ---------- */
.page-topics .topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-line);
}

.page-topics .topic-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-line);
}

@media (min-width: 860px) {
  .page-topics .topic-row {
    grid-template-columns: 72px minmax(0, 1fr) 190px;
    gap: var(--space-4);
    align-items: start;
    padding: var(--space-4) 0;
  }
}

.page-topics .topic-row__idx {
  display: inline-block;
  align-self: start;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  border-radius: var(--radius-sm);
  transition: background-color 240ms ease, color 240ms ease;
}

.page-topics .topic-row:hover .topic-row__idx,
.page-topics .topic-row:focus-within .topic-row__idx {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

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

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

.page-topics .topic-row__tag {
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  border: 1px solid currentColor;
  border-radius: var(--radius-pill);
}

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

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

@media (min-width: 860px) {
  .page-topics .topic-row__meta {
    flex-direction: column;
    align-items: flex-start;
  }
}

.page-topics .topic-row__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-topics .topic-row__chip {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-contrast-ink);
  background: var(--color-contrast-surface);
  border-radius: var(--radius-sm);
}

.page-topics .topic-row__more {
  grid-column: 1 / -1;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
  transition: max-height 260ms ease, opacity 260ms ease, margin-top 260ms ease;
}

@media (min-width: 860px) {
  .page-topics .topic-row__more {
    grid-column: 2 / -1;
  }
}

.page-topics .topic-row:hover .topic-row__more,
.page-topics .topic-row:focus-within .topic-row__more {
  max-height: 8em;
  opacity: 1;
  margin-top: var(--space-2);
}

@media (hover: none) {
  .page-topics .topic-row__more {
    max-height: none;
    opacity: 1;
    margin-top: var(--space-2);
  }
}

/* ---------- 追读路线 ---------- */
.page-topics .path-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-topics .path {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-line);
}

.page-topics .path:last-child {
  border-bottom: 1px solid var(--color-line);
}

@media (min-width: 900px) {
  .page-topics .path {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--space-6);
    align-items: start;
    padding: var(--space-6) 0;
  }
}

.page-topics .path__label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-accent);
}

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

.page-topics .path__desc {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-muted);
}

.page-topics .path__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

@media (min-width: 720px) {
  .page-topics .path__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
  }
}

.page-topics .path__step {
  position: relative;
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-topics .path__step-idx {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-topics .path__step a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--color-accent) 45%, transparent);
  transition: border-color 200ms ease;
}

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

/* ---------- 深读入口 ---------- */
.page-topics .deep-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding: var(--space-6) var(--tp-pad);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

@media (min-width: 860px) {
  .page-topics .deep-entry {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
    align-items: start;
    padding: var(--space-8);
  }
}

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

.page-topics .deep-entry__title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-topics .deep-entry__desc {
  margin: 0;
  max-width: 52ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-topics .deep-entry .btn {
  display: inline-block;
  margin-top: var(--space-4);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-primary-ink);
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: transform 240ms ease, box-shadow 240ms ease;
}

.page-topics .deep-entry .btn:hover,
.page-topics .deep-entry .btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  outline: none;
}

.page-topics .deep-entry__facts {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-contrast-line);
}

.page-topics .deep-entry__fact {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  margin: 0;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-contrast-line);
  font-size: var(--text-sm);
}

.page-topics .deep-entry__fact dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

.page-topics .deep-entry__fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

/* ---------- 更新说明 ---------- */
.page-topics .update-note {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

@media (min-width: 860px) {
  .page-topics .update-note {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-8);
    align-items: start;
  }
}

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

.page-topics .update-list li {
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.page-topics .update-list strong {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-topics .update-list a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--color-accent) 45%, transparent);
}

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

.page-topics .update-foot {
  margin: var(--space-6) 0 0;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-topics .update-foot a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-line);
}

.page-topics .update-foot a:hover,
.page-topics .update-foot a:focus-visible {
  border-bottom-color: var(--color-primary);
  color: var(--color-primary);
}

@media (prefers-reduced-motion: reduce) {
  .page-topics * {
    transition-duration: 0.01ms !important;
  }

  .page-topics .deep-entry .btn:hover,
  .page-topics .deep-entry .btn:focus-visible {
    transform: none;
  }
}