.page-strength {
  overflow-x: clip;
  display: block;
}

/* ===== 首屏：案例证据墙 ===== */
.page-strength .strength-hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-6) var(--space-6);
}

.page-strength .strength-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(62% 55% at 10% -12%, color-mix(in srgb, var(--color-primary) 30%, transparent), transparent 70%),
    radial-gradient(54% 48% at 100% 4%, color-mix(in srgb, var(--color-accent) 20%, transparent), transparent 72%);
}

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

.page-strength .hero-grid {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.page-strength .hero-kicker {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-strength .hero-copy .display {
  margin: 0;
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

@supports (background-clip: text) or (-webkit-background-clip: text) {
  .page-strength .hero-copy .display {
    background-image: linear-gradient(102deg, var(--color-ink) 0%, var(--color-ink) 46%, var(--color-primary) 78%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.page-strength .hero-copy .lede {
  margin: var(--space-4) 0 0;
  max-width: 56ch;
  color: var(--color-ink-soft);
}

.page-strength .hero-figures {
  display: grid;
  gap: var(--space-4);
  align-content: end;
}

.page-strength .hero-fig--lg {
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-strength .hero-fig--lg .figure-number {
  display: block;
  line-height: 0.88;
  color: var(--color-ink);
}

.page-strength .hero-fig__unit {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.page-strength .hero-fig__note {
  margin: var(--space-1) 0 0;
  max-width: 34ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-strength .hero-fig-mini-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-strength .hero-fig-mini {
  display: grid;
  gap: calc(var(--space-1) / 2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-line) 70%, transparent);
}

.page-strength .hero-fig-mini:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-strength .hero-fig-mini .mono {
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-accent);
}

.page-strength .hero-fig-mini p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-strength .hero-visual {
  margin: var(--space-6) 0 0;
}

.page-strength .figure__frame {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface-deep) 60%, transparent);
}

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

.page-strength .hero-visual .figure__frame {
  aspect-ratio: 21 / 9;
  max-height: 420px;
}

.page-strength .hero-rule {
  height: var(--border-thick);
  margin-top: var(--space-6);
  background: linear-gradient(90deg, transparent, var(--color-primary) 32%, var(--color-accent) 68%, transparent);
  box-shadow: 0 0 20px color-mix(in srgb, var(--color-accent) 55%, transparent);
}

/* ===== 粘性案例分类目录 ===== */
.page-strength .strength-toc {
  position: sticky;
  top: 0;
  z-index: 6;
  border-block: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
  backdrop-filter: blur(10px);
}

.page-strength .strength-toc__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding-block: var(--space-2);
}

.page-strength .strength-toc__label {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-strength .strength-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-strength .strength-toc__list a {
  display: inline-block;
  padding: calc(var(--space-1) / 2) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  text-decoration: none;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.page-strength .strength-toc__list a:hover,
.page-strength .strength-toc__list a:focus-visible,
.page-strength .strength-toc__list a[aria-current="true"] {
  color: var(--color-primary-ink);
  background: var(--color-primary);
  border-color: var(--color-primary);
}

/* ===== 案例区块 ===== */
.page-strength .case-block {
  scroll-margin-top: calc(var(--space-8) + var(--space-4));
}

.page-strength .strength-head {
  display: grid;
  gap: var(--space-2);
  max-width: 64ch;
}

.page-strength .strength-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-strength .strength-head .section-title {
  margin: 0;
}

.page-strength .strength-head .lede {
  margin: 0;
  color: var(--color-ink-soft);
}

.page-strength .case-figure {
  margin: var(--space-6) 0 0;
}

.page-strength .case-figure .figure__frame {
  aspect-ratio: 16 / 9;
}

.page-strength .case-list {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-strength .case {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface) 82%, transparent);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.page-strength .case:hover,
.page-strength .case:focus-within {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.page-strength .case__head {
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.page-strength .case__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-strength .case__title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-strength .case__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.page-strength .case__main {
  margin-top: var(--space-3);
}

.page-strength .case__steps {
  margin: 0;
  display: grid;
}

.page-strength .case__step {
  padding-block: var(--space-2);
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-line) 75%, transparent);
}

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

.page-strength .case__step dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-strength .case__step dd {
  margin: var(--space-1) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-strength .case__result {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
  margin: var(--space-3) 0 0;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 52%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-primary) 16%, transparent);
}

.page-strength .case__result .mono {
  flex: 0 0 auto;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
}

.page-strength .block-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-strength .block-next p {
  flex: 1 1 22ch;
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-strength .block-next .btn {
  flex: 0 0 auto;
}

/* ===== 口径与下一步 ===== */
.page-strength .basis-grid {
  align-items: start;
}

.page-strength .basis-note {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
}

.page-strength .basis-note p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-strength .basis-grid .figure {
  margin: 0;
}

.page-strength .basis-grid .figure__frame {
  aspect-ratio: 3 / 2;
}

.page-strength .basis-links {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.page-strength .basis-link {
  display: block;
  padding: var(--space-3);
  text-decoration: none;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface-deep) 45%, transparent);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-strength .basis-link:hover,
.page-strength .basis-link:focus-visible {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.page-strength .basis-link__key {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent);
}

.page-strength .basis-link__name {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-strength .basis-link__text {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-strength .block-next--final {
  justify-content: space-between;
}

.page-strength .block-next--final p {
  max-width: 58ch;
  color: var(--color-ink);
}

/* ===== 显现与返回顶部 ===== */
.page-strength .reveal {
  opacity: 1;
  transform: none;
}

.has-js .page-strength .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.has-js .page-strength .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.page-strength .to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 7;
  display: none;
  align-items: center;
  justify-content: center;
  width: var(--space-6);
  height: var(--space-6);
  padding: 0;
  cursor: pointer;
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border: 0;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-2);
}

.page-strength .to-top.is-shown {
  display: inline-flex;
}

.page-strength .to-top__mark {
  font-size: var(--text-lg);
  line-height: 1;
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-strength .hero-fig-mini {
    grid-template-columns: minmax(0, auto) minmax(0, 1fr);
    gap: var(--space-1) var(--space-3);
    align-items: baseline;
  }

  .page-strength .strength-hero {
    padding-block: var(--space-8) var(--space-8);
  }

  .page-strength .case-figure .figure__frame {
    aspect-ratio: 21 / 9;
  }
}

@media (min-width: 900px) {
  .page-strength .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
    align-items: end;
    margin-top: var(--space-6);
  }

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

  .page-strength .hero-fig-mini-list {
    padding-left: var(--space-3);
    border-left: var(--border-thin) solid var(--color-line);
  }

  .page-strength .case {
    display: grid;
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: var(--space-6);
    padding: var(--space-6);
  }

  .page-strength .case:nth-child(even) {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-strength .case:nth-child(even) .case__head {
    order: 2;
  }

  .page-strength .case:nth-child(even) .case__main {
    order: 1;
    margin-top: 0;
  }

  .page-strength .case:nth-child(odd) .case__main {
    margin-top: 0;
  }

  .page-strength .case-list {
    gap: var(--space-6);
  }

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

@media (prefers-reduced-motion: reduce) {
  .has-js .page-strength .reveal,
  .has-js .page-strength .reveal.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-strength .case,
  .page-strength .basis-link {
    transition: none;
  }

  .page-strength .case:hover,
  .page-strength .case:focus-within,
  .page-strength .basis-link:hover,
  .page-strength .basis-link:focus-visible {
    transform: none;
  }
}