/* =====================================================================
   page-strength —— 核心优势：核对过程实证
   ===================================================================== */

.page-strength {
  position: relative;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  background-image:
    radial-gradient(70% 38% at 6% 24%, color-mix(in srgb, var(--color-primary-soft) 72%, transparent) 0%, transparent 68%),
    radial-gradient(62% 34% at 97% 60%, color-mix(in srgb, var(--color-highlight) 74%, transparent) 0%, transparent 70%),
    radial-gradient(58% 30% at 46% 96%, color-mix(in srgb, var(--color-primary-soft) 56%, transparent) 0%, transparent 72%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

/* ---------- 首屏：深色对照分区 ---------- */

.page-strength .st-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--space-3) calc(var(--section-y) * 0.7);
}

.page-strength .st-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-strength .st-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: none;
  opacity: 0.40;
}

.page-strength .st-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(110% 82% at 10% 6%, color-mix(in srgb, var(--color-contrast-accent) 18%, transparent) 0%, transparent 56%),
    linear-gradient(108deg,
      color-mix(in srgb, var(--color-contrast-surface) 94%, transparent) 0%,
      color-mix(in srgb, var(--color-contrast-surface) 56%, transparent) 48%,
      color-mix(in srgb, var(--color-contrast-surface) 96%, transparent) 100%);
}

.page-strength .st-hero__shell {
  position: relative;
  z-index: 2;
}

/* 面包屑 */

.page-strength .st-crumb .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.page-strength .st-crumb .breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.page-strength .st-crumb .breadcrumbs li + li::before {
  content: "/";
  color: color-mix(in srgb, var(--color-contrast-ink) 34%, transparent);
}

.page-strength .st-crumb .breadcrumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--color-contrast-ink) 30%, transparent);
  transition: color 200ms ease, border-color 200ms ease;
}

.page-strength .st-crumb .breadcrumbs a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

/* 首屏主体 */

.page-strength .st-hero__inner {
  display: grid;
  gap: var(--space-6);
  padding-block-start: var(--space-6);
}

.page-strength .st-hero__eyebrow {
  margin: 0 0 var(--space-3);
  color: var(--color-contrast-accent);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
}

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

.page-strength .st-hero__intro {
  margin: var(--space-4) 0 0;
  max-width: 44ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-strength .st-hero__cta {
  margin: var(--space-4) 0 0;
}

/* 首屏数字组 */

.page-strength .st-hero__figures {
  align-self: end;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-contrast-surface) 76%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-strength .st-hero__fignote {
  margin: 0 0 var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.page-strength .st-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2) var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-strength .st-metric {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-block-end: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-strength .st-metric__v {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums;
}

.page-strength .st-metric__u {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

/* ---------- 分组区块 ---------- */

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

.page-strength .st-group__head {
  max-width: 64ch;
  margin-block-end: var(--space-6);
  padding-inline-start: var(--space-3);
  border-inline-start: 3px solid var(--color-primary);
}

.page-strength .st-group__head .eyebrow {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.page-strength .st-group__head h2 {
  margin: var(--space-1) 0 0;
  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-strength .st-group__note {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

/* ---------- 实证片段 ---------- */

.page-strength .st-proofs > * + * {
  margin-block-start: var(--space-4);
}

.page-strength .st-proof {
  position: relative;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(178deg, color-mix(in srgb, var(--color-primary-soft) 62%, transparent) 0%, transparent 58%),
    color-mix(in srgb, var(--color-surface) 84%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-1);
}

.page-strength .st-proof__no {
  display: inline-block;
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.22em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-strength .st-proof__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-strength .st-proof__scene,
.page-strength .st-proof__act {
  margin: 0 0 var(--space-2);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-strength .st-proof__act {
  margin-block-end: 0;
}

.page-strength .st-proof__k {
  display: inline-block;
  min-width: 3.2em;
  margin-inline-end: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.page-strength .st-proof__result {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin: var(--space-3) 0 0;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-strength .st-proof__rk {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.page-strength .st-proof__v {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-strength .st-proof__rd {
  flex: 1 1 15rem;
  min-width: 0;
  font-size: var(--text-sm);
  line-height: 1.68;
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

/* 可展开的做法细节 */

.page-strength .st-proof__more {
  margin-block-start: var(--space-2);
  border-top: var(--border-thin) dashed var(--color-line);
}

.page-strength .st-proof__more summary {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  cursor: pointer;
  list-style: none;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.page-strength .st-proof__more summary::-webkit-details-marker {
  display: none;
}

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

.page-strength .st-proof__more[open] summary::before {
  content: "−";
}

.page-strength .st-proof__more p {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 图片 ---------- */

.page-strength .st-shot {
  margin: 0;
}

.page-strength .st-shot__media {
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-deep);
  aspect-ratio: 16 / 10;
}

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

.page-strength .st-shot__cap {
  margin-block-start: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 核对节奏（深色分区） ---------- */

.page-strength .st-beat {
  position: relative;
  padding-block: var(--space-8);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-strength .st-beat::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg,
    var(--color-contrast-accent) 0%,
    transparent 40%,
    var(--color-primary) 100%);
}

.page-strength .st-beat__grid {
  display: grid;
  gap: var(--space-6);
}

.page-strength .st-beat__eyebrow {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}

.page-strength .st-beat h2 {
  margin: var(--space-1) 0 var(--space-3);
  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 .st-beat__note {
  margin: 0 0 var(--space-6);
  max-width: var(--measure);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-strength .st-beat .st-shot__media {
  border-color: var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-line) 40%, transparent);
}

.page-strength .st-beat .st-shot__cap {
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent);
}

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

.page-strength .st-step {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border-inline-start: 2px solid var(--color-contrast-line);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
  transition: border-color 220ms ease, background-color 220ms ease;
}

.page-strength .st-step:hover {
  border-inline-start-color: var(--color-contrast-accent);
  background: color-mix(in srgb, var(--color-contrast-ink) 11%, transparent);
}

.page-strength .st-step__t {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums;
}

.page-strength .st-step__h {
  margin: 0 0 var(--space-1);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-strength .st-step__p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

/* ---------- 过程链路 ---------- */

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

.page-strength .st-chain__head {
  max-width: 62ch;
  margin-block-end: var(--space-6);
}

.page-strength .st-chain__head .eyebrow {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.page-strength .st-chain__head h2 {
  margin: var(--space-1) 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-ink);
}

.page-strength .st-chain__note {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

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

.page-strength .st-chain__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-primary-soft) 44%, transparent);
}

.page-strength .st-chain__n {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-strength .st-chain__h {
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-strength .st-chain__p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.72;
  color: var(--color-ink-soft);
}

/* ---------- 行动出口 ---------- */

.page-strength .st-exit {
  padding-block: var(--space-6) var(--section-y);
}

.page-strength .st-exit__panel {
  display: grid;
  gap: var(--space-6);
  padding: var(--space-6);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(88% 130% at 100% 0%, color-mix(in srgb, var(--color-highlight) 78%, transparent) 0%, transparent 62%),
    color-mix(in srgb, var(--color-surface) 88%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-1);
}

.page-strength .st-exit__copy .eyebrow {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.page-strength .st-exit__copy h2 {
  margin: var(--space-1) 0 var(--space-2);
  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 .st-exit__copy p {
  margin: 0;
  max-width: var(--measure);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

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

.page-strength .st-exit__acts .btn {
  width: 100%;
}

/* ---------- 结果数字脉冲 ---------- */

@media (prefers-reduced-motion: no-preference) {
  .page-strength .st-proof.is-visible .st-proof__v {
    animation: st-strength-pulse 900ms ease-out 1;
  }
}

@keyframes st-strength-pulse {
  0% { filter: brightness(1); }
  32% { filter: brightness(1.75); }
  100% { filter: brightness(1); }
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-strength .st-step {
    grid-template-columns: 9rem minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-1) var(--space-3);
  }

  .page-strength .st-step__t {
    grid-row: 1;
  }

  .page-strength .st-step > div {
    grid-row: 1;
  }

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

@media (min-width: 760px) {
  .page-strength .st-chain__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-strength .st-chain__item {
    grid-column: span 2;
  }

  .page-strength .st-chain__item:nth-child(4) {
    grid-column: 2 / span 2;
  }

  .page-strength .st-chain__item:nth-child(5) {
    grid-column: 4 / span 2;
  }
}

@media (min-width: 900px) {
  .page-strength .st-group {
    padding-block: var(--section-y);
  }

  .page-strength .st-proofs {
    display: block;
  }

  .page-strength .st-proofs > * + * {
    margin-block-start: var(--space-6);
  }

  .page-strength .st-proof {
    padding: var(--space-6);
  }

  .page-strength .st-proof:nth-of-type(odd) {
    width: 63%;
    margin-inline-end: auto;
    margin-inline-start: 0;
  }

  .page-strength .st-proof:nth-of-type(even) {
    width: 57%;
    margin-inline-start: auto;
    margin-inline-end: 0;
  }

  .page-strength .st-shot {
    width: 46%;
    margin-inline-start: auto;
    margin-inline-end: 5%;
  }

  .page-strength .st-beat {
    padding-block: var(--section-y);
  }

  .page-strength .st-chain {
    padding-block: var(--section-y);
  }

  .page-strength .st-exit {
    padding-block: var(--space-8) var(--section-y);
  }

  .page-strength .st-exit__panel {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    align-items: end;
    gap: var(--space-8);
    padding: var(--space-8);
  }
}

@media (min-width: 1000px) {
  .page-strength .st-hero__inner {
    grid-template-columns: minmax(0, 1.16fr) minmax(0, 0.84fr);
    align-items: end;
    gap: var(--space-8);
    padding-block-start: var(--section-y);
  }

  .page-strength .st-beat__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
    gap: var(--space-8);
  }

  .page-strength .st-beat__fig {
    margin-block-start: var(--space-4);
  }
}