.page-topics {
  --topics-dial-size: min(100%, 300px);
  --topics-tick-height: var(--space-4);
}

/* ---------- 首屏 ---------- */
.page-topics .topics-hero {
  background: var(--color-surface);
  padding-block: var(--space-3) var(--section-y);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.page-topics .topics-hero__grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: minmax(0, 1fr);
  margin-top: var(--space-6);
}

.page-topics .topics-hero__lead {
  min-width: 0;
}

.page-topics .topics-hero__title {
  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-ink);
  margin-block: var(--space-2) var(--space-3);
  text-wrap: balance;
}

.page-topics .topics-hero__lead .lede {
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-topics .topics-stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin: var(--space-6) 0 0;
  padding: var(--space-4) 0 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-topics .topics-stats .datum {
  display: grid;
  gap: var(--space-1);
  min-width: 96px;
}

.page-topics .topics-stats .datum-value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
}

.page-topics .topics-stats .datum-label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* 首屏视觉主体 */
.page-topics .topics-hero__stage {
  display: grid;
  gap: var(--space-6);
  align-items: center;
  min-width: 0;
}

.page-topics .topics-dial {
  position: relative;
  width: var(--topics-dial-size);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
}

.page-topics .topics-dial__ring {
  position: absolute;
  inset: calc(-1 * var(--space-3));
  border-radius: 50%;
  background: repeating-conic-gradient(
    from -0.36deg,
    var(--color-accent) 0 0.72deg,
    transparent 0.72deg 32.727deg
  );
  -webkit-mask: radial-gradient(circle at 50% 50%, transparent 0 74%, #000 74%);
  mask: radial-gradient(circle at 50% 50%, transparent 0 74%, #000 74%);
  pointer-events: none;
}

.page-topics .topics-dial__face {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border: var(--border-thick) solid var(--color-ink);
  display: grid;
  place-content: center;
  justify-items: center;
  gap: var(--space-1);
  text-align: center;
  padding: var(--space-4);
}

.page-topics .topics-dial__label {
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  opacity: 0.86;
}

.page-topics .topics-dial__num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
}

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

.page-topics .topics-hero__shot {
  margin: 0;
  padding: var(--space-2);
  background: var(--color-surface-alt);
  border: var(--border-thick) solid var(--color-ink);
}

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

.page-topics .topics-hero__shot .media-caption {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* 首屏刻度索引 */
.page-topics .topics-ruler {
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: var(--space-3) 0 0;
  border-top: var(--border-thin) solid var(--color-ink);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(52px, 1fr));
  gap: var(--space-1);
}

.page-topics .topics-ruler a {
  display: grid;
  justify-items: start;
  gap: var(--space-1);
  padding-block: var(--space-1);
  text-decoration: none;
  color: var(--color-ink-muted);
}

.page-topics .topics-ruler__tick {
  display: block;
  width: var(--border-thick);
  height: var(--topics-tick-height);
  background: var(--color-ink-muted);
  transition: height 0.2s ease, background-color 0.2s ease;
}

.page-topics .topics-ruler__label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.page-topics .topics-ruler a:hover .topics-ruler__tick,
.page-topics .topics-ruler a:focus-visible .topics-ruler__tick {
  height: calc(var(--topics-tick-height) + var(--space-3));
  background: var(--color-accent);
}

.page-topics .topics-ruler a:hover .topics-ruler__label {
  color: var(--color-accent);
}

/* ---------- 过滤条 ---------- */
.page-topics .topics-filter {
  background: var(--color-surface-alt);
  padding-block: var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-topics .topics-filter .title-md {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-topics .topics-filter .meta {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
}

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

/* ---------- 方向区块 ---------- */
.page-topics .topic-direction {
  padding-block: var(--section-y);
}

.page-topics .topic-direction--blue {
  background: var(--color-primary-soft);
}

.page-topics .topic-direction--green {
  background: var(--color-highlight);
}

.page-topics .topic-direction--slate {
  background: var(--color-surface-alt);
}

.page-topics .topic-direction--steel {
  background: var(--color-surface-deep);
}

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

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

.page-topics .topic-direction__num {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-primary);
}

.page-topics .topic-direction--deep .topic-direction__num {
  color: var(--color-contrast-accent);
}

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

.page-topics .topic-direction--deep .topic-direction__title {
  color: var(--color-contrast-ink);
}

.page-topics .topic-direction__lede {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-topics .topic-direction--deep .topic-direction__lede {
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

.page-topics .topic-direction__inner {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: minmax(0, 1fr);
}

.page-topics .topic-direction__main {
  min-width: 0;
}

.page-topics .topic-direction__body {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: minmax(0, 1fr);
}

.page-topics .topic-direction__media {
  margin: 0;
  padding: var(--space-2);
  background: var(--color-surface);
  border: var(--border-thick) solid var(--color-ink);
  align-self: start;
}

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

.page-topics .topic-direction__media figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ---------- 专题卡片 ---------- */
.page-topics .topic-card {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  transition: transform 0.22s ease, border-color 0.22s ease;
}

.page-topics .topic-card:hover,
.page-topics .topic-card:focus-within {
  border-color: var(--color-primary);
  transform: translateX(6px);
}

.page-topics .topic-card__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--space-8);
  height: var(--space-8);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid currentColor;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
  transition: transform 0.22s ease, background-color 0.22s ease, color 0.22s ease;
}

.page-topics .topic-card:hover .topic-card__num,
.page-topics .topic-card:focus-within .topic-card__num {
  transform: translateY(-4px);
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

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

.page-topics .topic-card__lede {
  margin: 0;
  color: var(--color-ink-soft);
}

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

.page-topics .topic-card__points li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-topics .topic-card__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: var(--space-2);
  height: var(--border-thin);
  background: var(--color-accent);
}

.page-topics .topic-card__meta {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-topics .topic-card__link {
  justify-self: start;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: var(--border-thin);
}

.page-topics .topic-card__link:hover {
  color: var(--color-focus);
}

.page-topics .topic-card__link:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 3px;
}

/* 深色方向内的卡片反相 */
.page-topics .topic-direction--deep .topic-card {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
}

.page-topics .topic-direction--deep .topic-card:hover,
.page-topics .topic-direction--deep .topic-card:focus-within {
  border-color: var(--color-contrast-accent);
}

.page-topics .topic-direction--deep .topic-card__num {
  color: var(--color-contrast-accent);
}

.page-topics .topic-direction--deep .topic-card:hover .topic-card__num,
.page-topics .topic-direction--deep .topic-card:focus-within .topic-card__num {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.page-topics .topic-direction--deep .topic-card__title,
.page-topics .topic-direction--deep .topic-card__points li {
  color: var(--color-contrast-ink);
}

.page-topics .topic-direction--deep .topic-card__lede,
.page-topics .topic-direction--deep .topic-card__meta {
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-topics .topic-direction--deep .topic-card__points li::before {
  background: var(--color-contrast-accent);
}

.page-topics .topic-direction--deep .topic-card__link {
  color: var(--color-contrast-accent);
}

/* ---------- 关系图 ---------- */
.page-topics .topics-graph {
  padding-block: var(--section-y-lg);
  background: var(--color-surface);
  border-top: var(--border-thick) solid var(--color-ink);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

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

.page-topics .topics-graph__head .lede {
  color: var(--color-ink-soft);
  margin-top: var(--space-2);
}

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

.page-topics .topic-graph {
  display: block;
  width: 100%;
  height: auto;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

.page-topics .topic-graph__links path {
  stroke: var(--color-line);
  stroke-width: 2;
  stroke-dasharray: 6 6;
}

.page-topics .topic-graph__node circle {
  fill: var(--color-surface);
  stroke: var(--color-ink);
  stroke-width: 2;
}

.page-topics .topic-graph__node--main circle {
  fill: var(--color-primary);
  stroke: var(--color-primary);
}

.page-topics .topic-graph__num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  fill: var(--color-ink);
  text-anchor: middle;
  dominant-baseline: central;
}

.page-topics .topic-graph__node--main .topic-graph__num {
  fill: var(--color-primary-ink);
}

.page-topics .topic-graph__label {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  fill: var(--color-ink-soft);
  text-anchor: middle;
}

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

.page-topics .topics-graph__notes li {
  border-left: var(--border-thick) solid var(--color-accent);
  padding-left: var(--space-3);
}

.page-topics .topic-graph__step {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.page-topics .topics-graph__notes p {
  margin: 0;
  color: var(--color-ink-soft);
}

/* ---------- 更新记录 ---------- */
.page-topics .topics-log {
  padding-block: var(--section-y);
  background: var(--color-surface-alt);
}

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

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

.page-topics .topics-log__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  grid-template-columns: minmax(0, 1fr);
}

.page-topics .topics-log__item {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-topics .topics-log__marker {
  display: block;
  width: var(--space-4);
  height: var(--border-thin);
  background: var(--color-accent);
}

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

.page-topics .topics-log__text {
  margin: 0;
  color: var(--color-ink-soft);
}

.page-topics .topics-log__item .tag {
  justify-self: start;
}

/* ---------- 延伸入口 ---------- */
.page-topics .topics-exit {
  padding-block: var(--section-y-lg);
  background: var(--color-surface);
}

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

.page-topics .topics-exit__head .title-xl {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: var(--space-2) 0 var(--space-3);
}

.page-topics .topics-exit__head .lede {
  color: var(--color-ink-soft);
}

.page-topics .topics-exit__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  grid-template-columns: minmax(0, 1fr);
  counter-reset: exit;
}

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

.page-topics .topics-exit__order {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.page-topics .topics-exit__item .title-lg {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  margin: 0;
}

.page-topics .topics-exit__item .title-lg a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thick) solid var(--color-accent);
  padding-bottom: var(--space-1);
}

.page-topics .topics-exit__item .title-lg a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.page-topics .topics-exit__item .title-lg a:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 4px;
}

.page-topics .topics-exit__item p {
  margin: 0;
  color: var(--color-ink-soft);
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-topics .topic-direction__head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

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

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

/* ---------- 宽屏 ---------- */
@media (min-width: 900px) {
  .page-topics .topics-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: end;
  }

  .page-topics .topics-hero__stage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-topics .topics-hero__shot {
    margin-top: var(--space-8);
  }

  .page-topics .topic-direction__inner--with-media {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-topics .topic-direction__inner--media-left {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-topics .topic-direction__inner--media-left .topic-direction__main {
    order: 2;
  }

  .page-topics .topic-direction__inner--media-left .topic-direction__media {
    order: 1;
  }

  .page-topics .topics-graph__stage {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-topics .topics-log__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-topics .topics-exit__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-topics .topics-hero__shot {
    margin-top: var(--space-6);
    margin-bottom: calc(-1 * var(--space-4));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-topics .topic-card,
  .page-topics .topic-card__num,
  .page-topics .topics-ruler__tick {
    transition: none;
  }

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

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