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

/* ---------- 面包屑条 ---------- */
.page-strength .crumb-bar {
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-strength .crumb-bar .container {
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

/* ---------- 首屏深色对比区 ---------- */
.page-strength .journey-hero {
  position: relative;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  overflow: hidden;
}

.page-strength .journey-hero .container {
  padding-top: var(--space-6);
  padding-bottom: 0;
}

.page-strength .journey-hero__grid {
  display: grid;
  gap: var(--space-4);
  align-items: end;
}

.page-strength .journey-hero__eyebrow {
  margin: 0 0 var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.page-strength .journey-hero__title {
  margin: 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-contrast-ink);
}

.page-strength .journey-hero__text {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, var(--color-contrast-surface));
}

.page-strength .journey-hero__figure {
  margin: 0;
  border: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .journey-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) brightness(0.86);
}

/* 关键数字带 */
.page-strength .hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .hero-figures__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-2) var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .hero-figures__item:nth-child(even) {
  border-left: var(--border-thin) solid var(--color-contrast-line);
  padding-left: var(--space-2);
}

.page-strength .hero-figures__num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-strength .hero-figures__unit {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-contrast-ink);
}

.page-strength .hero-figures__note {
  flex: 1 1 100%;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-style: italic;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* 旅程刻度带 */
.page-strength .track {
  display: flex;
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  scrollbar-width: thin;
}

.page-strength .track__item {
  flex: 1 0 148px;
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .track__item:first-child {
  border-left: 0;
}

.page-strength .track__node {
  position: relative;
  display: block;
  padding: var(--space-3) var(--space-2) var(--space-4);
  background: transparent;
  border: 0;
  text-decoration: none;
  color: var(--color-contrast-ink);
  font-family: var(--font-body);
  transition: color 160ms ease;
}

.page-strength .track__node::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: var(--border-thick);
  background: var(--color-contrast-line);
  transition: background 200ms ease;
}

.page-strength .track__node:hover::before,
.page-strength .track__node:focus-visible::before,
.page-strength .track__node[aria-current]::before {
  background: var(--color-contrast-accent);
}

.page-strength .track__node:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: -2px;
}

.page-strength .track__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-strength .track__label {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-heading);
}

.page-strength .track__meta {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-style: italic;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

/* ---------- 章节索引条 ---------- */
.page-strength .toc--rail {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-strength .toc--rail .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.page-strength .toc--rail .toc__title {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.page-strength .toc--rail .toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-strength .toc--rail .toc__link {
  display: inline-block;
  padding-bottom: 2px;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
}

.page-strength .toc--rail .toc__link:hover {
  color: var(--color-primary);
}

.page-strength .toc--rail .toc__link[aria-current] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ---------- 章节通用 ---------- */
.page-strength .chapter-head {
  margin-bottom: var(--space-4);
}

.page-strength .phase-body {
  display: grid;
  gap: var(--space-4);
}

.page-strength .steps {
  display: grid;
  gap: var(--space-3);
}

/* ---------- 环节要点框 ---------- */
.page-strength .step {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.page-strength .step__head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.page-strength .step__no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
}

.page-strength .step__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-strength .step__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-2) 0;
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-strength .step__meta dt {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-strength .step__meta dd {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-strength .step__gain {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-strength .step__gain a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

.page-strength .step__signal {
  margin: var(--space-2) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-style: italic;
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 图片 ---------- */
.page-strength .phase-figure {
  margin: 0;
}

.page-strength .phase-figure img,
.page-strength .phase-strip__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-strength .phase-figure figcaption {
  margin-top: var(--space-1);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-style: italic;
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

.page-strength .phase-strip__figure {
  margin: var(--space-4) 0;
}

/* ---------- 章节尾巴引导 ---------- */
.page-strength .phase-tail {
  margin: var(--space-4) 0 0;
  padding: var(--space-3);
  background: var(--color-surface-deep);
  border-left: var(--border-thick) solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-strength .phase-tail a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

/* ---------- 对照表 ---------- */
.page-strength .roster-wrap {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.page-strength .roster {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--color-surface);
}

.page-strength .roster__caption {
  padding: var(--space-2);
  text-align: left;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-style: italic;
  color: var(--color-ink-muted);
  caption-side: top;
}

.page-strength .roster th,
.page-strength .roster td {
  padding: var(--space-2);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-strength .roster thead th {
  background: var(--color-surface-deep);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.page-strength .roster tbody td,
.page-strength .roster tbody th {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-strength .roster tbody th {
  font-weight: var(--weight-heading);
}

.page-strength .roster tbody td:first-child {
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.page-strength .roster tbody tr:last-child td,
.page-strength .roster tbody tr:last-child th {
  border-bottom: 0;
}

/* ---------- 推进信号折叠 ---------- */
.page-strength .signals {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  overflow: hidden;
}

.page-strength .signal {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-strength .signal:first-child {
  border-top: 0;
}

.page-strength .signal > summary {
  display: flex;
  gap: var(--space-2);
  align-items: baseline;
  padding: var(--space-3);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-strength .signal > summary::-webkit-details-marker {
  display: none;
}

.page-strength .signal > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-accent);
}

.page-strength .signal[open] > summary::before {
  content: "\2212";
}

.page-strength .signal[open] > summary {
  color: var(--color-primary);
}

.page-strength .signal__body {
  margin: 0;
  padding: 0 var(--space-3) var(--space-3) calc(var(--space-3) + var(--space-3));
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-strength .signal__body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

/* ---------- 出口带 ---------- */
.page-strength .exit-band {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .exit-band .container {
  display: grid;
  gap: var(--space-4);
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-strength .exit-band__figure {
  margin: 0;
  border: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .exit-band__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.78) brightness(0.78);
}

.page-strength .exit-band__title {
  margin: 0 0 var(--space-2);
  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-strength .exit-band__text {
  margin: 0;
  max-width: var(--measure);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, var(--color-contrast-surface));
}

.page-strength .exit-band__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 760px) {
  .page-strength .journey-hero .container {
    padding-top: var(--space-8);
  }

  .page-strength .hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-strength .hero-figures__item:nth-child(even) {
    border-left: var(--border-thin) solid var(--color-contrast-line);
    padding-left: var(--space-2);
  }

  .page-strength .hero-figures__item:nth-child(odd) {
    border-left: var(--border-thin) solid var(--color-contrast-line);
    padding-left: var(--space-2);
  }

  .page-strength .hero-figures__item:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-strength .track__item {
    flex: 1 1 0;
    min-width: 0;
  }
}

/* ---------- 宽屏栅格 ---------- */
@media (min-width: 960px) {
  .page-strength .journey-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-strength .phase-body--side {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
    gap: var(--space-6);
  }

  .page-strength .phase-body--aside-left {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr);
    align-items: start;
    gap: var(--space-6);
  }

  .page-strength .exit-band .container {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-strength .exit-band__title {
    font-size: var(--text-4xl);
  }
}

@media (min-width: 1120px) {
  .page-strength .journey-hero__title {
    max-width: 16ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-strength .track__node,
  .page-strength .track__node::before {
    transition: none;
  }
}