.page-start {
  --start-num-size: var(--text-2xl);
  display: block;
}

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

.page-start .start-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    115deg,
    transparent 0 46px,
    color-mix(in srgb, var(--color-contrast-line) 42%, transparent) 46px 47px
  );
  opacity: 0.55;
  pointer-events: none;
}

.page-start .start-hero__inner {
  position: relative;
  z-index: 1;
}

.page-start .start-hero__crumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
  margin-bottom: var(--space-4);
}

.page-start .start-hero__crumb a {
  color: var(--color-contrast-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted color-mix(in srgb, var(--color-contrast-accent) 60%, transparent);
}

.page-start .start-hero__crumb a:hover,
.page-start .start-hero__crumb a:focus-visible {
  border-bottom-style: solid;
}

.page-start .start-hero__grid {
  display: grid;
  gap: var(--space-4);
}

.page-start .start-hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  max-width: 16ch;
}

.page-start .start-hero__lead {
  margin: var(--space-3) 0 0;
  max-width: 48ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-start .start-hero__figure {
  margin: 0;
}

.page-start .start-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-contrast-line);
  filter: grayscale(0.7) contrast(1.05);
}

/* ---------- 步骤序号轴 ---------- */
.page-start .digit-rail {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: var(--space-3) 0 0;
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  border-top: var(--border-thin) dashed var(--color-contrast-line);
  -webkit-overflow-scrolling: touch;
}

.page-start .digit-rail__link {
  flex: 0 0 auto;
  min-width: 82px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-2) var(--space-1) var(--space-1);
  text-decoration: none;
  border-top: var(--border-thick) solid transparent;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
  transition: color 200ms ease, border-color 200ms ease;
}

.page-start .digit-rail__link:hover,
.page-start .digit-rail__link:focus-visible {
  color: var(--color-contrast-ink);
  border-top-color: var(--color-contrast-accent);
}

.page-start .digit-rail__num {
  font-family: var(--font-mono);
  font-size: var(--start-num-size);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-start .digit-rail__name {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}

/* ---------- 首屏关键数字 ---------- */
.page-start .hero-facts {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--border-thin);
  background: var(--color-contrast-line);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-start .hero-facts li {
  background: var(--color-contrast-surface);
  padding: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-start .hero-facts .stat__value {
  font-family: var(--font-mono);
  color: var(--color-contrast-ink);
}

.page-start .hero-facts .stat__label {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ---------- 步骤主体 ---------- */
.page-start .start-steps {
  background: var(--color-surface);
  padding-block: var(--section-y) var(--section-y-lg);
}

.page-start .start-steps__inner {
  display: grid;
  gap: var(--space-6);
}

.page-start .start-toc {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  border-left: var(--border-thick) solid var(--color-primary);
  padding-left: var(--space-2);
}

.page-start .start-toc__title {
  color: var(--color-ink-muted);
  margin: 0 0 4px;
}

.page-start .start-toc .toc__link {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-start .start-toc .toc__link:hover,
.page-start .start-toc .toc__link:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.page-start .start-toc .toc__link.is-active,
.page-start .start-toc .toc__link[aria-current] {
  color: var(--color-primary);
  font-weight: var(--weight-heading);
  border-bottom-color: var(--color-primary);
}

/* ---------- 路径折线示意 ---------- */
.page-start .route-map {
  margin: 0 0 var(--space-6);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-start .route-map__cap {
  display: block;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}

.page-start .route-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-start .route-map__line {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 2;
  stroke-dasharray: 5 5;
}

.page-start .route-map__nodes circle {
  fill: var(--color-surface);
  stroke: var(--color-primary);
  stroke-width: 2;
}

.page-start .route-map__nodes .route-map__node--end {
  fill: var(--color-accent);
  stroke: var(--color-accent);
}

.page-start .route-map__labels text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  fill: var(--color-ink-muted);
}

/* ---------- 阶段分组 ---------- */
.page-start .phase + .phase {
  margin-top: var(--space-8);
}

.page-start .phase__head {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-start .phase__tag {
  display: block;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.page-start .phase__title {
  position: relative;
  margin: 0;
  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);
  padding-bottom: var(--space-2);
}

.page-start .phase__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 52px;
  height: 3px;
  background: var(--color-primary);
}

.page-start .phase__desc {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 单个步骤 ---------- */
.page-start .step {
  position: relative;
  padding-left: 46px;
  padding-block: var(--space-3);
}

.page-start .step::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  border-left: var(--border-thin) dotted var(--color-line);
}

.page-start .step:first-of-type::before {
  top: var(--space-3);
}

.page-start .step:last-of-type::before {
  bottom: auto;
  height: calc(var(--space-3) + 34px);
}

.page-start .step__node {
  position: absolute;
  left: 0;
  top: var(--space-3);
  z-index: 1;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
}

.page-start .step__body {
  max-width: var(--measure);
}

.page-start .step__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-start .step__index {
  display: block;
  color: var(--color-primary);
  margin-bottom: 4px;
}

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

.page-start .step__op .label-mono {
  color: var(--color-ink-muted);
}

.page-start .step__notes {
  margin-top: var(--space-2);
  display: grid;
  gap: var(--space-2);
}

.page-start .step__note {
  margin: 0;
  padding-left: var(--space-2);
  border-left: var(--border-thick) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-start .step__note .label-mono {
  display: block;
  color: var(--color-ink-muted);
  margin-bottom: 2px;
}

.page-start .step__note--warn {
  border-left-color: var(--color-accent);
}

.page-start .step__note--warn .label-mono {
  color: var(--color-accent);
}

/* ---------- 主客场两栏读法 ---------- */
.page-start .readout {
  margin: var(--space-4) 0;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-start .readout__cap {
  display: block;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}

.page-start .readout__cols {
  display: grid;
  gap: var(--space-2);
}

.page-start .readout__col {
  padding: var(--space-2);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.page-start .readout__col p {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-start .readout__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  padding: 3px var(--space-1);
  border-radius: var(--radius-sm);
}

.page-start .readout__col--home {
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-start .readout__col--home .readout__badge {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-start .readout__col--away {
  border-right: var(--border-thick) solid var(--color-accent);
}

.page-start .readout__col--away .readout__badge {
  background: transparent;
  color: var(--color-accent);
  border: var(--border-thin) solid var(--color-accent);
}

.page-start .readout__hint {
  margin: var(--space-2) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) dotted var(--color-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

/* ---------- 步骤配图 ---------- */
.page-start .start-figure {
  margin: var(--space-4) 0;
}

/* ---------- 后续路径 ---------- */
.page-start .next-paths {
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-block: var(--section-y);
}

.page-start .next-paths__inner {
  display: grid;
  gap: var(--space-4);
}

.page-start .next-paths__title {
  margin: 0;
  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-start .next-paths__text {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-start .next-paths__ver {
  margin: var(--space-3) 0 0;
  color: var(--color-ink-muted);
}

.page-start .next-paths__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--border-thin);
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-start .next-paths__item {
  background: var(--color-surface);
  padding: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-start .next-paths__link {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thick) solid transparent;
  align-self: flex-start;
  transition: border-color 160ms ease;
}

.page-start .next-paths__link:hover,
.page-start .next-paths__link:focus-visible {
  border-bottom-color: var(--color-accent);
}

.page-start .next-paths__note {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 焦点可见 ---------- */
.page-start a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 显现动效 ---------- */
.js .page-start [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 240ms ease, transform 240ms ease;
}

.js .page-start [data-reveal].is-visible,
.js .page-start [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js .page-start [data-reveal],
  .js .page-start [data-reveal].is-visible,
  .js .page-start [data-reveal].is-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-start .digit-rail__link,
  .page-start .next-paths__link,
  .page-start .start-toc .toc__link {
    transition: none;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-start {
    --start-num-size: var(--text-3xl);
  }

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

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

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

@media (min-width: 900px) {
  .page-start .start-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-6);
    align-items: end;
  }

  .page-start .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-start .digit-rail {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    overflow-x: visible;
  }

  .page-start .next-paths__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: var(--space-6);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-start .start-steps__inner {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-start .start-toc {
    position: sticky;
    top: var(--space-6);
  }
}