.page-standards {
  --spec-rail-w: 210px;
  --spec-num-size: var(--text-3xl);
}

/* ---------- 封面 ---------- */
.page-standards .spec-cover {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-6) 0 var(--space-8);
}

.page-standards .spec-cover__bg {
  position: absolute;
  inset: 0;
}

.page-standards .spec-cover__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) sepia(0.4) saturate(1.5) contrast(1.05);
  opacity: 0.5;
}

.page-standards .spec-cover__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-standards .spec-cover__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-standards .spec-cover .breadcrumb {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-standards .spec-cover .breadcrumb a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-contrast-line);
  text-underline-offset: 3px;
}

.page-standards .spec-cover .breadcrumb a:hover,
.page-standards .spec-cover .breadcrumb a:focus-visible {
  color: var(--color-contrast-accent);
}

.page-standards .spec-cover__title {
  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);
  margin: var(--space-3) auto var(--space-3);
  max-width: 11em;
  text-wrap: balance;
}

.page-standards .spec-cover__lede {
  max-width: 58ch;
  margin: 0 auto;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-standards .spec-cover__meta {
  margin: var(--space-3) auto 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

/* ---------- 六格索引 ---------- */
.page-standards .spec-index {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--border-thin);
  background-color: var(--color-contrast-line);
  border: var(--border-thin) solid var(--color-contrast-line);
  text-align: left;
}

@media (min-width: 560px) {
  .page-standards .spec-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-standards .spec-index__item {
  display: flex;
  min-width: 0;
}

.page-standards .spec-index__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  width: 100%;
  padding: var(--space-3);
  text-decoration: none;
  color: var(--color-contrast-ink);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 86%, transparent);
  transition: background-color 0.18s ease;
}

.page-standards .spec-index__link:hover,
.page-standards .spec-index__link:focus-visible {
  background-color: var(--color-contrast-surface);
}

.page-standards .spec-index__link:focus-visible {
  outline: var(--border-thick) solid var(--color-contrast-accent);
  outline-offset: -3px;
}

.page-standards .spec-index__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.page-standards .spec-index__num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-standards .spec-index__stat {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1.1;
  color: var(--color-contrast-accent);
  letter-spacing: -0.01em;
}

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

/* ---------- 案例骨架 ---------- */
.page-standards .spec-case {
  border-top: var(--border-thin) solid var(--color-surface-deep);
}

.page-standards .spec-case:first-of-type {
  border-top: 0;
}

.page-standards .spec-case__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

@media (min-width: 860px) {
  .page-standards .spec-case__grid {
    grid-template-columns: minmax(140px, var(--spec-rail-w)) minmax(0, 1fr);
    gap: var(--space-6);
  }
}

.page-standards .spec-case__rail {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-top: var(--space-2);
  border-top: var(--border-thick) solid var(--color-primary);
}

@media (min-width: 860px) {
  .page-standards .spec-case__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

.page-standards .spec-case__num {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--spec-num-size);
  line-height: 1;
  letter-spacing: 0;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-standards .spec-case__body {
  min-width: 0;
}

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

@media (min-width: 860px) {
  .page-standards .spec-case__title {
    font-size: var(--text-2xl);
  }
}

/* ---------- 处境 / 做法 / 结果 ---------- */
.page-standards .spec-steps {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

@media (min-width: 760px) {
  .page-standards .spec-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
  }
}

.page-standards .spec-steps__item {
  min-width: 0;
}

.page-standards .spec-steps dt {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
  font-weight: var(--weight-body);
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-1);
  margin: 0 0 var(--space-1);
}

.page-standards .spec-steps dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  max-width: var(--measure);
}

/* ---------- 结论数字带 ---------- */
.page-standards .spec-verdict {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  background-color: var(--color-primary-soft);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-standards .spec-verdict__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.page-standards .spec-verdict__text {
  flex: 1 1 16ch;
  min-width: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 区间带 ---------- */
.page-standards .spec-band {
  margin: var(--space-4) 0 0;
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

.page-standards .spec-band__cap {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-3);
}

.page-standards .spec-band__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

@media (min-width: 720px) {
  .page-standards .spec-band__row {
    grid-template-columns: 4.5em minmax(0, 1fr) 6.5em;
    align-items: center;
    gap: var(--space-2);
  }
}

.page-standards .spec-band__key {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-standards .spec-band__track {
  position: relative;
  display: block;
  height: 26px;
  background-color: var(--color-surface-deep);
  background-image: repeating-linear-gradient(
    to right,
    var(--color-line) 0 1px,
    transparent 1px 10%
  );
  border: var(--border-thin) solid var(--color-line);
  overflow: hidden;
}

.page-standards .spec-band__fill {
  position: absolute;
  top: 3px;
  bottom: 3px;
}

.page-standards .spec-band__fill--before {
  left: 46.7%;
  width: 10%;
  background-color: color-mix(in srgb, var(--color-primary) 40%, var(--color-surface-deep));
}

.page-standards .spec-band__fill--after {
  left: 68.3%;
  width: 10%;
  background-color: var(--color-primary);
}

.page-standards .spec-band__val {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-ink);
  white-space: nowrap;
}

@media (min-width: 720px) {
  .page-standards .spec-band__val {
    text-align: right;
  }
}

.page-standards .spec-band__foot {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 分钟刻度条 ---------- */
.page-standards .spec-minutes {
  margin: var(--space-4) 0 0;
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

.page-standards .spec-minutes__cap {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-3);
}

.page-standards .spec-minutes__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 4em;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

@media (min-width: 720px) {
  .page-standards .spec-minutes__row {
    grid-template-columns: 4.5em minmax(0, 1fr) 4em;
  }
}

.page-standards .spec-minutes__key {
  grid-column: 1 / -1;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

@media (min-width: 720px) {
  .page-standards .spec-minutes__key {
    grid-column: auto;
  }
}

.page-standards .spec-minutes__track {
  position: relative;
  display: block;
  grid-column: 1 / -1;
  height: 32px;
  background-color: var(--color-surface-deep);
  background-image: repeating-linear-gradient(
    to right,
    var(--color-line) 0 1px,
    transparent 1px calc(100% / 15)
  );
  border: var(--border-thin) solid var(--color-line);
}

@media (min-width: 720px) {
  .page-standards .spec-minutes__track {
    grid-column: auto;
  }
}

.page-standards .spec-minutes__marker {
  position: absolute;
  top: 0;
  bottom: 0;
  width: var(--border-thick);
  background-color: var(--color-accent);
  transform: translateX(-50%);
}

.page-standards .spec-minutes__marker--before {
  left: 80%;
}

.page-standards .spec-minutes__marker--after {
  left: 40%;
}

.page-standards .spec-minutes__val {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-accent);
  text-align: right;
  white-space: nowrap;
}

.page-standards .spec-minutes__foot {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 续订对照表 ---------- */
.page-standards .spec-subs {
  margin: var(--space-4) 0 0;
  width: 100%;
}

.page-standards .spec-subs__cap {
  caption-side: top;
  text-align: left;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  padding-bottom: var(--space-2);
}

/* ---------- 配图 ---------- */
.page-standards .spec-figure {
  margin: var(--space-4) 0 0;
}

/* ---------- 收尾出口 ---------- */
.page-standards .spec-outro {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) double var(--color-contrast-line);
}

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

@media (min-width: 900px) {
  .page-standards .spec-outro__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
  }
}

.page-standards .spec-outro__lead {
  min-width: 0;
}

.page-standards .spec-outro__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-3);
}

.page-standards .spec-outro__text {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-standards .spec-outro__list {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-standards .spec-outro__item {
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-standards .spec-outro__item:last-child {
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-standards .spec-outro__link {
  display: block;
  padding: var(--space-3) 0;
  text-decoration: none;
  color: var(--color-contrast-ink);
}

.page-standards .spec-outro__label {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.2;
  color: var(--color-contrast-accent);
  margin-bottom: var(--space-1);
}

.page-standards .spec-outro__desc {
  display: block;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.page-standards .spec-outro__link:hover .spec-outro__label,
.page-standards .spec-outro__link:focus-visible .spec-outro__label {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-standards .spec-outro__link:focus-visible {
  outline: var(--border-thick) solid var(--color-contrast-accent);
  outline-offset: 2px;
}

/* ---------- 图片响应式兜底 ---------- */
.page-standards img {
  max-width: 100%;
  height: auto;
}

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