/* ==========================================================================
   赛事专题 /topics/ —— 页面作用域 .page-topics
   ========================================================================== */

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

/* --------------------------------------------------------------------------
   01 首屏：深空底 + 展示级标题 + 数字组 + 视觉 + 六格导览
   -------------------------------------------------------------------------- */

.page-topics .topics-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--space-6) var(--section-y);
}

.page-topics .topics-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 16%, color-mix(in srgb, var(--color-contrast-accent) 28%, transparent) 0%, transparent 44%),
    radial-gradient(circle at 86% 74%, color-mix(in srgb, var(--color-primary) 26%, transparent) 0%, transparent 48%);
}

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

.page-topics .topics-hero__crumb a {
  color: color-mix(in srgb, var(--color-contrast-ink) 75%, transparent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

.page-topics .topics-hero__crumb li[aria-current] {
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.page-topics .topics-hero__kicker {
  margin-top: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  color: var(--color-contrast-accent);
}

.page-topics .topics-hero__title {
  margin-top: var(--space-2);
  max-width: 20ch;
  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-contrast-ink);
}

.page-topics .topics-hero__lead {
  margin-top: var(--space-3);
  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);
}

/* 首屏数字组 */
.page-topics .topics-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding: 0;
  list-style: none;
}

.page-topics .hero-figure {
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 62%, transparent);
}

.page-topics .hero-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-topics .hero-figure__label {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

/* 首屏主视觉 */
.page-topics .topics-hero__media {
  margin-top: var(--space-6);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-contrast-surface);
}

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

/* 六格分类导览 */
.page-topics .topic-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.page-topics .topic-nav__item {
  display: grid;
  grid-template-rows: auto auto auto auto;
  gap: var(--space-1);
  align-content: start;
  min-height: 128px;
  padding: var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 82%, transparent);
  color: var(--color-contrast-ink);
  text-decoration: none;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-topics .topic-nav__item:hover,
.page-topics .topic-nav__item:focus-visible {
  border-color: var(--color-contrast-accent);
  transform: translateY(-1px);
}

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

.page-topics .topic-nav__mark {
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 1px;
}

.page-topics .topic-nav__mark--1 { background-color: var(--color-primary); }
.page-topics .topic-nav__mark--2 { background-color: var(--color-contrast-accent); }
.page-topics .topic-nav__mark--3 { background-color: color-mix(in srgb, var(--color-primary) 55%, var(--color-contrast-ink)); }
.page-topics .topic-nav__mark--4 { background-color: color-mix(in srgb, var(--color-contrast-accent) 62%, var(--color-contrast-ink)); }
.page-topics .topic-nav__mark--5 { background-color: color-mix(in srgb, var(--color-primary) 80%, var(--color-contrast-ink)); }
.page-topics .topic-nav__mark--6 { background-color: color-mix(in srgb, var(--color-contrast-accent) 80%, var(--color-contrast-ink)); }

.page-topics .topic-nav__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

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

.page-topics .topic-nav__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* 纯 CSS 当前态：锚点命中时对应导览块翻成浅金底 */
.page-topics:has(#topic-01:target) .topic-nav__item[href="#topic-01"],
.page-topics:has(#topic-02:target) .topic-nav__item[href="#topic-02"],
.page-topics:has(#topic-03:target) .topic-nav__item[href="#topic-03"],
.page-topics:has(#topic-04:target) .topic-nav__item[href="#topic-04"],
.page-topics:has(#topic-05:target) .topic-nav__item[href="#topic-05"],
.page-topics:has(#topic-06:target) .topic-nav__item[href="#topic-06"] {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-ink);
}

.page-topics:has(#topic-01:target) .topic-nav__item[href="#topic-01"] .topic-nav__num,
.page-topics:has(#topic-02:target) .topic-nav__item[href="#topic-02"] .topic-nav__num,
.page-topics:has(#topic-03:target) .topic-nav__item[href="#topic-03"] .topic-nav__num,
.page-topics:has(#topic-04:target) .topic-nav__item[href="#topic-04"] .topic-nav__num,
.page-topics:has(#topic-05:target) .topic-nav__item[href="#topic-05"] .topic-nav__num,
.page-topics:has(#topic-06:target) .topic-nav__item[href="#topic-06"] .topic-nav__num,
.page-topics:has(#topic-01:target) .topic-nav__item[href="#topic-01"] .topic-nav__count,
.page-topics:has(#topic-02:target) .topic-nav__item[href="#topic-02"] .topic-nav__count,
.page-topics:has(#topic-03:target) .topic-nav__item[href="#topic-03"] .topic-nav__count,
.page-topics:has(#topic-04:target) .topic-nav__item[href="#topic-04"] .topic-nav__count,
.page-topics:has(#topic-05:target) .topic-nav__item[href="#topic-05"] .topic-nav__count,
.page-topics:has(#topic-06:target) .topic-nav__item[href="#topic-06"] .topic-nav__count {
  color: var(--color-ink-soft);
}

.page-topics:has(#topic-01:target) .topic-nav__item[href="#topic-01"] .topic-nav__name,
.page-topics:has(#topic-02:target) .topic-nav__item[href="#topic-02"] .topic-nav__name,
.page-topics:has(#topic-03:target) .topic-nav__item[href="#topic-03"] .topic-nav__name,
.page-topics:has(#topic-04:target) .topic-nav__item[href="#topic-04"] .topic-nav__name,
.page-topics:has(#topic-05:target) .topic-nav__item[href="#topic-05"] .topic-nav__name,
.page-topics:has(#topic-06:target) .topic-nav__item[href="#topic-06"] .topic-nav__name {
  color: var(--color-ink);
}

/* --------------------------------------------------------------------------
   02 轮次纵深刻度尺
   -------------------------------------------------------------------------- */

.page-topics .depths .section-head__lead {
  max-width: var(--measure);
}

.page-topics .depth-ruler {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 3px;
  height: 68px;
  margin-top: var(--space-6);
  align-items: stretch;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-topics .depth-ruler__seg {
  display: block;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background-color: var(--color-primary-soft);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-primary) 0 1px,
    transparent 1px var(--depth-gap, 5px)
  );
  opacity: 0.72;
}

.page-topics .depth-ruler__seg--1 { --depth-gap: 6px; height: 46%; }
.page-topics .depth-ruler__seg--2 { --depth-gap: 5px; height: 58%; }
.page-topics .depth-ruler__seg--3 { --depth-gap: 3px; height: 88%; opacity: 0.95; }
.page-topics .depth-ruler__seg--4 { --depth-gap: 4px; height: 72%; }
.page-topics .depth-ruler__seg--5 { --depth-gap: 3px; height: 100%; opacity: 0.95; }
.page-topics .depth-ruler__seg--6 { --depth-gap: 4px; height: 76%; }
.page-topics .depth-ruler__seg--7 { --depth-gap: 5px; height: 62%; }
.page-topics .depth-ruler__seg--8 { --depth-gap: 6px; height: 50%; }

.page-topics .depth-scale {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 3px;
  margin-top: var(--space-2);
  padding: 0;
  list-style: none;
}

.page-topics .depth-scale li {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-muted);
  text-align: left;
}

.page-topics .depth-notes {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-6);
  max-width: var(--measure);
}

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

.page-topics .depth-notes__item .tag {
  margin-right: var(--space-1);
  vertical-align: 0.05em;
}

/* --------------------------------------------------------------------------
   03 口径切换条
   -------------------------------------------------------------------------- */

.page-topics .caliber {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
}

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

.page-topics .caliber__title {
  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 .caliber__switch {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  cursor: pointer;
  user-select: none;
}

.page-topics .caliber__switch-side {
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
  transition: color 0.18s ease;
}

.page-topics .caliber__track {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 22px;
  border-radius: var(--radius-pill);
  background-color: var(--color-line);
  transition: background-color 0.18s ease;
  flex: none;
}

.page-topics .caliber__knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.page-topics .caliber__toggle:checked ~ .caliber__bar .caliber__track {
  background-color: color-mix(in srgb, var(--color-accent) 42%, var(--color-line));
}

.page-topics .caliber__toggle:checked ~ .caliber__bar .caliber__knob {
  transform: translateX(22px);
  background-color: var(--color-accent);
}

.page-topics .caliber__toggle:focus-visible ~ .caliber__bar .caliber__switch {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-topics .caliber__hint {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

.page-topics .caliber__panels {
  display: grid;
  gap: var(--space-2);
}

.page-topics .caliber__panel {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-alt);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-topics .caliber__panel-title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-topics .caliber__panel-text {
  margin-top: var(--space-1);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-topics .caliber__toggle:not(:checked) ~ .caliber__panels .caliber__panel--league,
.page-topics .caliber__toggle:checked ~ .caliber__panels .caliber__panel--cup {
  border-color: var(--color-accent);
  background-color: var(--color-highlight);
}

/* --------------------------------------------------------------------------
   04 六个专题分组
   -------------------------------------------------------------------------- */

.page-topics .topic-panel {
  padding-block: var(--section-y);
  scroll-margin-top: 96px;
}

.page-topics .topic-panel--1,
.page-topics .topic-panel--3,
.page-topics .topic-panel--5 {
  background-color: var(--color-surface);
}

.page-topics .topic-panel--2,
.page-topics .topic-panel--4,
.page-topics .topic-panel--6 {
  background-color: var(--color-surface-alt);
}

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

.page-topics .panel-head__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--color-primary);
  transition: color 0.18s ease;
}

.page-topics .topic-panel:target .panel-head__num {
  color: var(--panel-mark, var(--color-primary));
}

.page-topics .panel-head__title {
  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);
}

.page-topics .panel-head__title::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: var(--space-2);
  border-radius: 1px;
  vertical-align: 0.1em;
  background-color: var(--panel-mark, var(--color-primary));
}

.page-topics .panel-head__lead {
  grid-column: 2;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .topic-panel--1 { --panel-mark: var(--color-primary); }
.page-topics .topic-panel--2 { --panel-mark: var(--color-accent); }
.page-topics .topic-panel--3 { --panel-mark: color-mix(in srgb, var(--color-primary) 46%, var(--color-accent)); }
.page-topics .topic-panel--4 { --panel-mark: color-mix(in srgb, var(--color-accent) 78%, var(--color-primary)); }
.page-topics .topic-panel--5 { --panel-mark: color-mix(in srgb, var(--color-primary) 82%, var(--color-ink-soft)); }
.page-topics .topic-panel--6 { --panel-mark: color-mix(in srgb, var(--color-accent) 60%, var(--color-ink-soft)); }

/* 卡片：右上角条目量悬停变色 */
.page-topics .card {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.page-topics .card:hover {
  border-color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
}

.page-topics .card .card__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-muted);
  transition: color 0.18s ease;
}

.page-topics .card:hover .card__meta {
  color: var(--color-accent);
}

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

.page-topics .card__title {
  color: var(--color-ink);
}

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

/* 分栏：图 + 编号清单 */
.page-topics .panel-split {
  display: grid;
  gap: var(--space-4);
  align-items: start;
}

.page-topics .panel-split__media {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  overflow: hidden;
}

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

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

.page-topics .note-list__item {
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-line);
  transition: border-color 0.18s ease;
}

.page-topics .note-list__item:hover {
  border-left-color: var(--color-accent);
}

.page-topics .note-list__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-muted);
}

.page-topics .note-list__title {
  margin-top: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-topics .note-list__text {
  margin-top: var(--space-1);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* 说明带 */
.page-topics .panel-note {
  margin-top: var(--space-6);
  max-width: var(--measure);
  padding: var(--space-3);
  border-left: 2px solid var(--color-primary);
  background-color: var(--color-primary-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

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

.page-topics .panel-note__text {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics .panel-note__text a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-topics .panel-note__text a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* 带图说明带 */
.page-topics .panel-note--media {
  display: grid;
  gap: var(--space-3);
  max-width: none;
  border-left: none;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  padding: var(--space-3);
}

.page-topics .panel-note--media .panel-note__media {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface);
}

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

.page-topics .panel-note--media .panel-note__title {
  color: var(--color-ink);
}

.page-topics .panel-note--media .panel-note__text {
  color: var(--color-ink-soft);
}

/* 全宽横图 */
.page-topics .panel-wide-media {
  margin-bottom: var(--space-6);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-surface-deep);
}

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

/* 折叠条目 */
.page-topics .folds {
  display: grid;
  gap: var(--space-2);
  max-width: var(--measure);
}

.page-topics .fold {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.page-topics .fold__summary {
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
}

.page-topics .fold__summary::-webkit-details-marker {
  display: none;
}

.page-topics .fold__summary::before {
  content: "+";
  display: inline-block;
  width: 1.2em;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.page-topics .fold[open] .fold__summary::before {
  content: "–";
}

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

.page-topics .fold__body {
  padding: 0 var(--space-3) var(--space-3);
}

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

/* --------------------------------------------------------------------------
   05 行动出口
   -------------------------------------------------------------------------- */

.page-topics .topics-exit {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y-lg);
}

.page-topics .topics-exit__kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  color: var(--color-contrast-accent);
}

.page-topics .topics-exit__title {
  margin-top: var(--space-2);
  max-width: 26ch;
  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-contrast-ink);
}

.page-topics .topics-exit__lead {
  margin-top: var(--space-3);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-topics .topics-exit__lead a {
  color: var(--color-contrast-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  transition: border-color 0.18s ease;
}

.page-topics .topics-exit__lead a:hover {
  border-color: var(--color-contrast-accent);
}

.page-topics .topics-exit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-topics .topics-exit__contact {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

/* --------------------------------------------------------------------------
   06 响应式
   -------------------------------------------------------------------------- */

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

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

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

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

  .page-topics .caliber__panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-topics .panel-note--media {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--space-4);
  }

  .page-topics .depth-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: none;
  }
}

@media (min-width: 900px) {
  .page-topics .panel-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-topics .panel-split--flip .panel-split__media {
    order: 2;
  }

  .page-topics .panel-split--flip .note-list {
    order: 1;
  }
}

@media (min-width: 1080px) {
  .page-topics .topic-nav {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

  .page-topics .topic-panel {
    padding-block: var(--section-y-lg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-topics .topic-nav__item,
  .page-topics .card,
  .page-topics .note-list__item,
  .page-topics .caliber__knob,
  .page-topics .caliber__track,
  .page-topics .caliber__panel {
    transition: none;
  }

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