.page-custom-steps {
  --cs-rail-size: var(--space-6);
  --cs-step-gap: var(--space-6);
}

/* 面包屑与首屏 */
.page-custom-steps .cs-intro {
  position: relative;
  overflow: hidden;
}

.page-custom-steps .cs-intro__inner {
  position: relative;
  z-index: 1;
}

.page-custom-steps .cs-intro__grid {
  margin-top: var(--space-6);
  row-gap: var(--space-6);
}

.page-custom-steps .cs-intro__lead .t-h1 {
  max-width: 22ch;
}

.page-custom-steps .cs-intro__lead .t-lede {
  margin-top: var(--space-3);
  max-width: 54ch;
  color: var(--color-ink);
}

.page-custom-steps .cs-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(calc(var(--space-8) * 1.2), 1fr));
  gap: var(--space-3);
  margin: 0;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-2);
}

.page-custom-steps .cs-facts__item {
  display: grid;
  gap: var(--space-1);
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-custom-steps .cs-facts__item dt {
  color: var(--color-ink-soft);
  letter-spacing: 0.04em;
}

.page-custom-steps .cs-facts__item dd {
  margin: 0;
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  line-height: 1;
}

.page-custom-steps .cs-intro__deco {
  right: calc(var(--space-8) * -1);
  top: calc(var(--space-8) * -1);
  opacity: 0.35;
}

/* 总览 */
.page-custom-steps .cs-overview__grid {
  row-gap: var(--space-6);
  align-items: start;
}

.page-custom-steps .cs-prose {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  max-width: var(--measure);
  margin-top: var(--space-3);
}

.page-custom-steps .cs-overview__figure {
  margin-top: var(--space-6);
}

.page-custom-steps .cs-overview__rail {
  position: relative;
  padding: var(--space-4) var(--space-2) var(--space-4) 0;
}

.page-custom-steps .cs-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-custom-steps .cs-track::before {
  content: "";
  position: absolute;
  left: calc(var(--cs-rail-size) / 2);
  top: calc(var(--cs-rail-size) / 2);
  bottom: calc(var(--cs-rail-size) / 2);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-custom-steps .cs-track__item {
  position: relative;
}

.page-custom-steps .cs-track__link {
  display: grid;
  grid-template-columns: var(--cs-rail-size) minmax(0, 1fr);
  gap: var(--space-3);
  align-items: center;
  padding-block: var(--space-1);
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-sm);
  transition: background-color 160ms ease-out;
}

.page-custom-steps .cs-track__link:hover,
.page-custom-steps .cs-track__link:focus-visible {
  background: var(--color-primary-soft);
  outline: none;
}

.page-custom-steps .cs-track__link:focus-visible {
  box-shadow: 0 0 0 var(--border-thin) var(--color-focus);
}

.page-custom-steps .cs-track__dot {
  width: var(--cs-rail-size);
  height: var(--cs-rail-size);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-primary);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  font-size: var(--text-sm);
  line-height: 1;
  transition: background-color 160ms ease-out, color 160ms ease-out, border-color 160ms ease-out;
}

.page-custom-steps .cs-track__link:hover .cs-track__dot,
.page-custom-steps .cs-track__link:focus-visible .cs-track__dot {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-custom-steps .cs-track__text {
  display: grid;
  gap: calc(var(--space-1) / 2);
  min-width: 0;
}

.page-custom-steps .cs-track__name {
  margin: 0;
  color: var(--color-ink);
}

.page-custom-steps .cs-track__time {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* 阶段区块通用 */
.page-custom-steps .cs-phase__head {
  max-width: 62ch;
  margin-bottom: var(--space-6);
}

.page-custom-steps .cs-phase__badge {
  display: inline-block;
  padding: calc(var(--space-1) / 2) var(--space-2);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  border-radius: var(--radius-sm);
  clip-path: polygon(0 0, 100% 0, calc(100% - var(--space-1)) 100%, 0 100%);
  margin-bottom: var(--space-3);
}

.page-custom-steps .cs-phase__badge--dark {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.page-custom-steps .cs-phase__note {
  margin-top: var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-custom-steps .cs-phase__title--dark {
  color: var(--color-contrast-ink);
}

.page-custom-steps .cs-phase__note--dark {
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

/* 单个步骤 */
.page-custom-steps .cs-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  padding-block: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-custom-steps .cs-step:first-of-type {
  border-top: none;
  padding-top: 0;
}

.page-custom-steps .cs-step__index {
  display: inline-grid;
  place-items: center;
  justify-self: start;
  min-width: calc(var(--space-8) + var(--space-2));
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-lg);
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, calc(100% - var(--space-2)) 100%, 0 100%);
}

.page-custom-steps .cs-step__body {
  display: grid;
  gap: var(--space-3);
  max-width: 74ch;
}

.page-custom-steps .cs-step__title--dark {
  color: var(--color-contrast-ink);
}

.page-custom-steps .cs-prose--dark {
  color: var(--color-contrast-ink);
  opacity: 0.9;
}

.page-custom-steps .cs-step__aside {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-primary);
}

.page-custom-steps .cs-step__figure {
  margin-top: var(--space-3);
}

/* 字段表 */
.page-custom-steps .cs-fields {
  margin: 0;
  display: grid;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-custom-steps .cs-fields__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-custom-steps .cs-fields__row dt {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-custom-steps .cs-fields__row dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-custom-steps .cs-fields--dark {
  border-top-color: var(--color-contrast-line);
}

.page-custom-steps .cs-fields--dark .cs-fields__row {
  border-bottom-color: var(--color-contrast-line);
}

.page-custom-steps .cs-fields--dark .cs-fields__row dt {
  color: var(--color-contrast-accent);
  opacity: 0.85;
}

.page-custom-steps .cs-fields--dark .cs-fields__row dd {
  color: var(--color-contrast-ink);
}

/* 对比 */
.page-custom-steps .cs-compare__lede {
  margin-top: var(--space-2);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  max-width: 62ch;
}

.page-custom-steps .cs-compare__grid {
  margin-top: var(--space-6);
  row-gap: var(--space-4);
}

.page-custom-steps .cs-compare__card {
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.page-custom-steps .cs-compare__card:nth-child(2) {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-2);
}

.page-custom-steps .cs-compare__card h3 {
  margin-bottom: var(--space-3);
  color: var(--color-ink);
}

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

.page-custom-steps .cs-list li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-custom-steps .cs-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--text-base) * 0.6);
  width: var(--space-2);
  height: var(--border-thin);
  background: var(--color-primary);
}

.page-custom-steps .cs-compare__link {
  margin-top: var(--space-4);
}

/* 行动出口 */
.page-custom-steps .cs-cta__inner {
  display: grid;
  gap: var(--space-6);
}

.page-custom-steps .cs-cta__text .cs-prose {
  max-width: 58ch;
}

.page-custom-steps .cs-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.page-custom-steps .cs-cta__foot {
  margin: 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  max-width: 70ch;
}

/* 平板以上 */
@media (min-width: 640px) {
  .page-custom-steps .cs-fields__row {
    grid-template-columns: minmax(0, calc(var(--space-8) * 2)) minmax(0, 1fr);
    gap: var(--space-3);
    align-items: baseline;
  }

  .page-custom-steps .cs-step {
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-4);
  }

  .page-custom-steps .cs-step__index {
    justify-self: stretch;
    writing-mode: horizontal-tb;
  }

  .page-custom-steps .cs-cta__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-custom-steps .cs-intro__grid,
  .page-custom-steps .cs-overview__grid {
    align-items: start;
  }

  .page-custom-steps .cs-overview__rail {
    padding-top: var(--space-6);
  }

  .page-custom-steps .cs-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: var(--space-8);
  }

  .page-custom-steps .cs-cta__foot {
    grid-column: 1 / -1;
  }

  .page-custom-steps .cs-phase__head {
    display: grid;
    gap: var(--space-2);
  }
}

/* 窄屏防溢出 */
@media (max-width: 420px) {
  .page-custom-steps .cs-track__link {
    grid-template-columns: var(--cs-rail-size) minmax(0, 1fr);
    gap: var(--space-2);
  }

  .page-custom-steps .cs-step__index {
    font-size: var(--text-base);
    padding: var(--space-1) var(--space-2);
  }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-custom-steps .cs-track__link,
  .page-custom-steps .cs-track__dot {
    transition: none;
  }
}