.page-strength {
  --strength-shadow: 6px 6px 0 color-mix(in srgb, var(--color-contrast-surface) 15%, transparent);
  --strength-shadow-hover: 10px 10px 0 color-mix(in srgb, var(--color-contrast-surface) 26%, transparent);
  --strength-tint: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
  --strength-line-dash: color-mix(in srgb, var(--color-line) 100%, transparent);
}

/* ---------- 首屏 ---------- */
.page-strength .strength-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
  padding: var(--space-6) 0 var(--space-8);
  border-bottom: var(--border-thick) solid var(--color-contrast-surface);
}

.page-strength .hero-shell {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

.page-strength .hero-lead .breadcrumb {
  margin-bottom: var(--space-3);
}

.page-strength .hero-title {
  font-size: var(--text-display);
  line-height: 0.98;
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-surface);
  margin: var(--space-3) 0 0;
}

.page-strength .hero-sub {
  margin: var(--space-4) 0 0;
  max-width: 34em;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-strength .hero-axis {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  position: relative;
}

.page-strength .hero-axis::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-soft) 100%);
}

.page-strength .axis-item {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
  font-weight: 600;
}

.page-strength .axis-item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 4px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--color-primary);
  border: var(--border-thick) solid var(--color-surface);
  box-shadow: var(--shadow-1);
}

.page-strength .axis-step {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  font-weight: 400;
}

/* ---------- 深底数字墙 ---------- */
.page-strength .hero-wall {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-lg);
  border: var(--border-thick) solid var(--color-contrast-surface);
  background: var(--color-contrast-surface);
  box-shadow: var(--strength-shadow);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.page-strength .hero-wall::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  z-index: 0;
}

.page-strength .wall-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
  z-index: -1;
  filter: saturate(0.6) contrast(1.1);
}

.page-strength .wall-cell {
  position: relative;
  z-index: 1;
  padding: var(--space-3) var(--space-2);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: var(--strength-tint);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-strength .wall-cell:hover,
.page-strength .wall-cell:focus-within {
  transform: translateY(-4px);
  border-color: var(--color-contrast-accent);
  box-shadow: 0 4px 0 color-mix(in srgb, var(--color-contrast-accent) 45%, transparent);
}

.page-strength .wall-figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-contrast-accent);
}

.page-strength .wall-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.45;
  color: var(--color-contrast-ink);
}

.page-strength .hero-note {
  margin: 0;
  padding: var(--space-3) 0 0;
  border-top: var(--border-thin) dashed var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: 62em;
}

/* ---------- 阶段区块 ---------- */
.page-strength .stage-block {
  position: relative;
  overflow: hidden;
  padding: var(--section-y) 0;
  background: var(--color-surface);
}

.page-strength .stage-block--alt {
  background: var(--color-surface-alt);
}

.page-strength .stage-block--soft {
  background: var(--color-primary-soft);
}

.page-strength .stage-head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  max-width: var(--measure);
}

.page-strength .stage-chip {
  justify-self: start;
  display: inline-block;
  padding: 5px var(--space-2);
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-contrast-surface);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
}

.page-strength .stage-head h2 {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-surface);
}

.page-strength .stage-intro {
  margin: 0;
  max-width: 56ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-strength .stage-span {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  font-weight: 700;
}

.page-strength .stage-layout {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

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

/* ---------- 节点说明牌 ---------- */
.page-strength .node-card {
  position: relative;
  padding: var(--space-4) var(--space-3) var(--space-3);
  border-radius: var(--radius-lg);
  border: var(--border-thick) solid var(--color-contrast-surface);
  background: var(--color-surface);
  box-shadow: var(--strength-shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-strength .node-card:hover,
.page-strength .node-card:focus-within {
  transform: translate(-3px, -3px);
  box-shadow: var(--strength-shadow-hover);
}

.page-strength .node-badge {
  position: absolute;
  top: calc(-1 * var(--space-2));
  left: var(--space-3);
  display: inline-block;
  padding: 4px var(--space-2);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-contrast-surface);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
}

.page-strength .node-title {
  margin: var(--space-2) 0 var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-surface);
}

.page-strength .node-facts {
  margin: 0 0 var(--space-2);
  padding: var(--space-2) 0;
  display: grid;
  gap: var(--space-1);
  border-top: var(--border-thin) dashed var(--strength-line-dash);
  border-bottom: var(--border-thin) dashed var(--strength-line-dash);
}

.page-strength .node-facts > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 var(--space-2);
}

.page-strength .node-facts dt {
  flex: 0 0 auto;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-strength .node-facts dd {
  margin: 0;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
}

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

.page-strength .node-outcome strong {
  color: var(--color-primary);
  font-weight: 700;
}

.page-strength .node-outcome a {
  color: var(--color-accent);
}

.page-strength .node-outcome a:hover {
  color: var(--color-primary);
}

/* ---------- 图片 ---------- */
.page-strength .stage-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: var(--border-thick) solid var(--color-contrast-surface);
  background: var(--color-contrast-surface);
  box-shadow: var(--strength-shadow);
}

.page-strength .stage-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.page-strength .stage-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-primary);
  mix-blend-mode: multiply;
  opacity: 0.16;
  pointer-events: none;
}

.page-strength .stage-media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: var(--space-4) var(--space-2) var(--space-2);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.page-strength .stage-media-stack {
  display: grid;
  gap: var(--space-4);
}

.page-strength .stage-media--small img {
  aspect-ratio: 3 / 2;
}

/* ---------- 装饰形状 ---------- */
.page-strength .stage-deco {
  z-index: 0;
  opacity: 0.55;
  transition: transform 0.6s ease;
}

.page-strength .deco-a {
  top: var(--space-6);
  right: calc(-1 * var(--space-2));
  width: calc(var(--space-8) + var(--space-1));
  height: calc(var(--space-8) + var(--space-1));
}

.page-strength .deco-b {
  bottom: var(--space-6);
  left: calc(-1 * var(--space-3));
  width: calc(var(--space-6) + var(--space-2));
  height: var(--space-3);
}

.page-strength .deco-c {
  top: var(--space-4);
  right: var(--space-4);
  width: var(--space-6);
  height: var(--space-6);
}

.page-strength .deco-d {
  bottom: var(--space-4);
  right: calc(-1 * var(--space-1));
  width: calc(var(--space-6) + var(--space-2));
  height: calc(var(--space-6) + var(--space-2));
}

.page-strength .stage-block:hover .deco-a {
  transform: rotate(18deg);
}

.page-strength .stage-block:hover .deco-c {
  transform: rotate(-12deg);
}

.page-strength .start-block:hover .deco-d {
  transform: rotate(9deg);
}

/* ---------- 起手出口区 ---------- */
.page-strength .start-block {
  position: relative;
  overflow: hidden;
  padding: var(--section-y-lg) 0;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-contrast-surface);
}

.page-strength .start-shell {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

.page-strength .start-lead .eyebrow {
  color: var(--color-contrast-accent);
}

.page-strength .start-lead h2 {
  margin: var(--space-2) 0 0;
  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);
  max-width: 18ch;
}

.page-strength .start-lead p {
  margin: var(--space-3) 0 0;
  max-width: 46ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

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

.page-strength .start-card {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: var(--strength-tint);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-strength .start-card:hover,
.page-strength .start-card:focus-within {
  border-color: var(--color-contrast-accent);
  transform: translateY(-3px);
}

.page-strength .start-index {
  display: inline-block;
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}

.page-strength .start-card h3 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-strength .start-card p {
  margin: 0 0 var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-strength .start-card .mono {
  color: var(--color-contrast-ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-strength .node-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }

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

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

@media (min-width: 960px) {
  .page-strength .strength-hero {
    padding: var(--space-8) 0 var(--section-y-lg);
  }

  .page-strength .hero-shell {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    column-gap: var(--gutter);
    row-gap: var(--space-8);
    align-items: start;
  }

  .page-strength .hero-wall {
    margin-top: var(--space-6);
    padding: var(--space-6) var(--space-4);
  }

  .page-strength .hero-note {
    grid-column: 1 / -1;
  }

  .page-strength .stage-block {
    padding: var(--section-y-lg) 0;
  }

  .page-strength .stage-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    column-gap: var(--gutter);
  }

  .page-strength .stage-layout--flip {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  }

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

  .page-strength .stage-media-stack {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-strength .start-shell {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    column-gap: var(--gutter);
  }

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

@media (min-width: 1180px) {
  .page-strength .deco-a {
    right: var(--space-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-strength .node-card,
  .page-strength .wall-cell,
  .page-strength .start-card,
  .page-strength .stage-deco {
    transition: none;
  }

  .page-strength .node-card:hover,
  .page-strength .wall-cell:hover,
  .page-strength .start-card:hover {
    transform: none;
  }

  .page-strength .stage-block:hover .deco-a,
  .page-strength .stage-block:hover .deco-c,
  .page-strength .start-block:hover .deco-d {
    transform: none;
  }
}