.page-standards {
  --std-hairline: color-mix(in srgb, var(--color-line) 78%, transparent);
  --std-hero-line: color-mix(in srgb, var(--color-contrast-ink) 26%, transparent);
  --std-tint: color-mix(in srgb, var(--color-primary) 14%, transparent);
}

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

/* 首屏 */
.page-standards .std-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-8) var(--space-4);
  margin-bottom: var(--space-8);
}

.page-standards .std-hero__media,
.page-standards .std-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-standards .std-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.5) contrast(1.04);
}

.page-standards .std-hero__scrim {
  background: var(--overlay-scrim);
}

.page-standards .std-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}

.page-standards .std-hero__title {
  margin: var(--space-3) 0 0;
  max-width: 12ch;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-standards .std-hero__lede {
  margin: var(--space-4) 0 0;
  max-width: 54ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-standards .std-figures {
  display: grid;
  gap: var(--space-4);
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: var(--space-4) 0 0;
  border-top: var(--border-thin) dashed var(--std-hero-line);
}

.page-standards .std-figures__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.page-standards .std-figures__label {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-contrast-ink);
}

.page-standards .std-figures__note {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

/* 口径分布带 */
.page-standards .std-band {
  margin-top: var(--space-6);
}

.page-standards .std-band__scale {
  display: flex;
  justify-content: space-between;
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) dashed var(--std-hero-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.page-standards .std-band__segments {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
}

.page-standards .std-band__seg {
  min-width: 0;
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--std-hero-line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-contrast-surface) 52%, transparent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-contrast-ink);
}

.page-standards .std-band__seg b {
  display: block;
  margin-bottom: 2px;
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
}

.page-standards .std-band__seg:nth-child(1) { flex-grow: 11; }
.page-standards .std-band__seg:nth-child(2) { flex-grow: 9; }
.page-standards .std-band__seg:nth-child(3) { flex-grow: 7; }
.page-standards .std-band__seg:nth-child(4) { flex-grow: 5; }

/* 通用标题与导语 */
.page-standards .std-h2 {
  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-ink);
}

.page-standards .std-lede {
  margin: 0 0 var(--space-6);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* 口径条款 */
.page-standards .std-clause-wrap {
  display: grid;
  gap: var(--space-6);
}

.page-standards .std-clause-list {
  min-width: 0;
}

.page-standards .std-clause {
  border-top: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-clause:last-child {
  border-bottom: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-clause__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
}

.page-standards .std-clause .expander__trigger {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
}

.page-standards .std-clause .expander__trigger:hover .std-clause__name,
.page-standards .std-clause .expander__trigger:focus-visible .std-clause__name {
  color: var(--color-primary);
}

.page-standards .std-clause__name {
  font-family: var(--font-heading);
  letter-spacing: var(--tracking-heading);
}

.page-standards .std-clause__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-standards .std-clause .expander__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

.page-standards .std-clause .expander__body {
  padding-bottom: var(--space-4);
}

.page-standards .std-clause .ledger__key {
  font-family: var(--font-heading);
  color: var(--color-ink);
}

.page-standards .std-clause .ledger__val {
  color: var(--color-ink-soft);
}

.page-standards .std-clause-media {
  display: grid;
  gap: var(--space-6);
  min-width: 0;
}

/* 实证案例 */
.page-standards .std-cases {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-case {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-6) 0;
  border-bottom: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-case__no {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

.page-standards .std-case__label {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.page-standards .std-case__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-standards .std-case__outcome {
  display: grid;
  gap: var(--space-3);
}

.page-standards .std-case__shard--result {
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-primary);
}

.page-standards .std-case__shard--result .std-case__label {
  color: var(--color-primary);
}

/* 复核对照 */
.page-standards .std-cadence .eyebrow {
  margin-bottom: var(--space-4);
}

.page-standards .std-cadence__head {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.page-standards .std-cadence__col + .std-cadence__col {
  margin-top: var(--space-6);
}

.page-standards .std-cadence__foot {
  margin: var(--space-6) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) dashed currentColor;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  opacity: 0.82;
}

/* 分歧处理 */
.page-standards .std-dispute-grid {
  display: grid;
  gap: var(--space-6);
}

.page-standards .std-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-standards .std-step {
  display: grid;
  grid-template-columns: var(--space-8) minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-top: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-steps > li:last-child {
  border-bottom: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-step__no {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

.page-standards .std-step__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-standards .std-step__body p {
  margin: 0;
  max-width: 58ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-standards .std-dispute__aside {
  display: grid;
  gap: var(--space-6);
  padding: var(--space-4);
  border: var(--border-thin) dashed var(--std-hairline);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-standards .std-flow {
  display: block;
  width: 100%;
  height: auto;
  color: var(--color-primary);
}

.page-standards .std-flow .std-flow__rail {
  stroke: var(--color-line);
  stroke-width: 1;
  stroke-dasharray: 3 5;
}

.page-standards .std-flow .std-flow__node {
  fill: var(--color-surface);
  stroke: currentColor;
  stroke-width: 1.5;
}

.page-standards .std-flow .std-flow__label {
  fill: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

/* 下一步入口 */
.page-standards .std-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-standards .std-next__item {
  border-top: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-next__item:last-child {
  border-bottom: var(--border-thin) dashed var(--std-hairline);
}

.page-standards .std-next__link {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4) 0;
  color: inherit;
  text-decoration: none;
}

.page-standards .std-next__kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.page-standards .std-next__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  transition: color 160ms ease;
}

.page-standards .std-next__desc {
  max-width: 62ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-standards .std-next__link:hover .std-next__title,
.page-standards .std-next__link:focus-visible .std-next__title {
  color: var(--color-primary);
}

@media (min-width: 640px) {
  .page-standards .std-hero {
    padding: var(--space-8) var(--space-6);
  }

  .page-standards .std-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-standards .std-band__segments {
    flex-direction: row;
  }

  .page-standards .std-cadence__col + .std-cadence__col {
    margin-top: 0;
  }
}

@media (min-width: 768px) {
  .page-standards .std-h2 {
    font-size: var(--text-3xl);
  }

  .page-standards .std-case {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-standards .std-case__outcome {
    grid-column: 2;
    grid-template-columns: minmax(0, 1fr);
  }

  .page-standards .std-case__shard--result {
    padding-left: var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-standards .std-clause-wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    align-items: start;
    gap: var(--space-8);
  }

  .page-standards .std-dispute-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    align-items: start;
    gap: var(--space-8);
  }
}

@media (min-width: 1000px) {
  .page-standards .std-case {
    grid-template-columns: 96px minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-standards .std-case__outcome {
    grid-column: auto;
    padding-left: var(--space-6);
    border-left: var(--border-thin) dashed var(--std-hairline);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-standards .std-next__title {
    transition: none;
  }
}