.page-strength {
  --strength-band-min: 200px;
  --strength-case-col: 3.6em;
}

/* ---------- 首屏 ---------- */
.page-strength .strength-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-4) 0 var(--space-8);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.page-strength .strength-hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-strength .strength-hero-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-strength .strength-hero-scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-strength .strength-hero-inner {
  position: relative;
  z-index: 1;
}

.page-strength .strength-crumbs {
  margin-bottom: var(--space-4);
}

.page-strength .strength-crumbs-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-strength .strength-crumbs-list li + li::before {
  content: "/";
  margin-right: var(--space-1);
  color: var(--color-contrast-line);
}

.page-strength .strength-crumbs-list a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-accent);
}

.page-strength .strength-crumbs-list a:hover {
  color: var(--color-contrast-accent);
}

.page-strength .strength-hero-kicker {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

.page-strength .strength-hero-title {
  margin: 0 0 var(--space-3);
  color: var(--color-contrast-ink);
  max-width: 18ch;
}

.page-strength .strength-hero-lede {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

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

/* ---------- 数字块 ---------- */
.page-strength .strength-figures {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
}

.page-strength .strength-figure {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-contrast-ink) 7%, var(--color-contrast-surface));
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
}

.page-strength .strength-figure--light {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  border-color: var(--color-primary);
}

.page-strength .strength-figure-value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: var(--tracking-heading);
}

.page-strength .strength-figure-unit {
  font-size: var(--text-xl);
  margin-left: 0.08em;
}

.page-strength .strength-figure-label {
  font-size: var(--text-sm);
  line-height: 1.45;
  color: color-mix(in srgb, currentColor 88%, transparent);
}

.page-strength .strength-figure-note {
  display: block;
  margin-top: var(--space-2);
  padding-top: var(--space-1);
  border-top: var(--border-thin) solid color-mix(in srgb, currentColor 24%, transparent);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: color-mix(in srgb, currentColor 74%, transparent);
}

/* ---------- 案例索引 ---------- */
.page-strength .strength-index {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-2);
}

.page-strength .strength-index-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

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

.page-strength .strength-index-item {
  display: grid;
  gap: 2px;
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-strength .strength-index-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-strength .strength-index-group {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-strength .strength-index-link {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-strength .strength-index-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 分组区块 ---------- */
.page-strength .strength-group {
  border-top: var(--border-thick) solid var(--color-primary);
}

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

.page-strength .strength-group--b {
  background: var(--color-primary-soft);
}

.page-strength .strength-group--c {
  background: var(--color-surface-deep);
}

.page-strength .strength-band {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: var(--strength-band-min);
  background: var(--color-contrast-surface);
}

.page-strength .strength-band-img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-strength .strength-band-scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--overlay-scrim);
}

.page-strength .strength-band-inner {
  padding-top: var(--space-6);
  padding-bottom: var(--space-4);
  color: var(--color-contrast-ink);
}

.page-strength .strength-band-kicker {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-strength .strength-band-title {
  margin: 0 0 var(--space-2);
  max-width: 26ch;
  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-contrast-ink);
}

.page-strength .strength-band-lede {
  margin: 0;
  max-width: 66ch;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-strength .strength-group-body {
  padding-top: var(--space-6);
  padding-bottom: var(--space-8);
}

/* ---------- 案例卡 ---------- */
.page-strength .strength-cases {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-strength .strength-case {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-left: calc(var(--border-thick) * 2) solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: transform 200ms ease-out, border-color 200ms ease-out,
    background-color 200ms ease-out, box-shadow 200ms ease-out;
}

.page-strength .strength-group--a .strength-case {
  background: var(--color-surface-alt);
}

.page-strength .strength-group--b .strength-case,
.page-strength .strength-group--c .strength-case {
  background: var(--color-surface);
}

.page-strength .strength-case:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  background: var(--color-highlight);
  box-shadow: var(--shadow-2);
}

.page-strength .strength-case-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
  padding-bottom: var(--space-2);
}

.page-strength .strength-case-title {
  margin: 0;
  flex: 1 1 12em;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-strength .strength-case-tag {
  display: inline-block;
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.page-strength .strength-case-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-strength .strength-case-row + .strength-case-row {
  margin-top: var(--space-2);
}

.page-strength .strength-case-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

.page-strength .strength-case-val {
  margin: 0;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.page-strength .strength-takeaway {
  margin: var(--space-6) 0 0;
  padding: var(--space-3);
  border-left: calc(var(--border-thick) * 2) solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.5;
  color: var(--color-ink);
}

/* ---------- 复核说明 ---------- */
.page-strength .strength-method {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--section-y) 0;
  border-top: var(--border-thick) solid var(--color-primary);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

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

.page-strength .strength-method-kicker {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-strength .strength-method-title {
  margin: 0 0 var(--space-3);
  max-width: 24ch;
  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-contrast-ink);
}

.page-strength .strength-method-lede {
  margin: 0 0 var(--space-4);
  max-width: 66ch;
  font-size: var(--text-base);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

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

.page-strength .strength-method-item {
  display: grid;
  gap: 2px;
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .strength-method-role {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-strength .strength-method-desc {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-strength .strength-method-note {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thick) solid var(--color-primary);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-strength .strength-method-figure {
  margin: 0;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-contrast-surface);
}

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

/* ---------- 出口 ---------- */
.page-strength .strength-exit {
  background: var(--color-surface);
  padding: var(--section-y) 0;
}

.page-strength .strength-exit-title {
  margin: 0 0 var(--space-2);
  max-width: 24ch;
  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-strength .strength-exit-lede {
  margin: 0 0 var(--space-6);
  max-width: 60ch;
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-strength .strength-exit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
}

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

.page-strength .strength-exit-link {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
  border-left: var(--border-thick) solid transparent;
  transition: background-color 180ms ease-out, border-color 180ms ease-out;
}

.page-strength .strength-exit-link:hover {
  background: var(--color-highlight);
  border-left-color: var(--color-accent);
}

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

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

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-strength .strength-hero {
    padding-top: var(--space-6);
  }

  .page-strength .strength-figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-strength .strength-case-row {
    grid-template-columns: minmax(0, var(--strength-case-col)) minmax(0, 1fr);
    gap: var(--space-2);
    align-items: start;
  }

  .page-strength .strength-method-item {
    grid-template-columns: minmax(0, 12em) minmax(0, 1fr);
    gap: var(--space-2);
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-strength .strength-hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-6);
    align-items: start;
  }

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

  .page-strength .strength-case:nth-child(even) {
    margin-top: var(--space-6);
  }

  .page-strength .strength-group--a .strength-cases {
    padding-bottom: var(--space-4);
  }

  .page-strength .strength-method-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: var(--space-6);
    align-items: start;
  }

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

  .page-strength .strength-exit-item:nth-child(even) {
    margin-top: var(--space-4);
  }
}

/* ---------- 悬停显示统计口径 ---------- */
@media (hover: hover) and (pointer: fine) {
  .page-strength .strength-figure {
    padding-bottom: calc(var(--space-6) + var(--space-4));
  }

  .page-strength .strength-figure-note {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    margin-top: 0;
    padding: var(--space-2);
    border-top: var(--border-thin) solid color-mix(in srgb, currentColor 24%, transparent);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    background: color-mix(in srgb, var(--color-contrast-surface) 72%, transparent);
    opacity: 0;
    transition: opacity 180ms ease-out;
  }

  .page-strength .strength-figure--light .strength-figure-note {
    background: color-mix(in srgb, var(--color-surface) 82%, transparent);
  }

  .page-strength .strength-figure:hover .strength-figure-note,
  .page-strength .strength-figure:focus-within .strength-figure-note {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-strength .strength-case,
  .page-strength .strength-index-link,
  .page-strength .strength-exit-link,
  .page-strength .strength-figure-note {
    transition: none;
  }

  .page-strength .strength-case:hover {
    transform: none;
  }
}