.page-start {
  --start-node: 13px;
  --start-border-double: calc(var(--border-thin) * 3);
  --start-ease: 160ms ease;
}

/* ---------- 首屏 ---------- */
.page-start .start-hero {
  padding: calc(var(--section-y) * 0.7) 0 0;
  text-align: center;
}

.page-start .start-hero .breadcrumb {
  justify-content: center;
  margin-bottom: var(--space-3);
}

.page-start .start-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  max-width: 15ch;
  margin: var(--space-3) auto var(--space-3);
}

.page-start .start-lede {
  max-width: 58ch;
  margin: 0 auto;
  color: var(--color-ink-soft);
}

.page-start .start-hero-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-1);
  margin: var(--space-4) 0 0;
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
}

.page-start .start-hero-num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
  line-height: 1;
}

.page-start .start-hero-unit {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.page-start .start-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin: 0 var(--space-2);
  background: var(--color-accent);
  vertical-align: middle;
}

/* ---------- 步骤轨道 ---------- */
.page-start .start-track-wrap {
  margin-top: var(--space-6);
  padding: var(--space-4) 0 var(--space-3);
  background: var(--color-highlight);
  border-block: var(--start-border-double) double var(--color-line);
  text-align: left;
}

.page-start .start-track-label {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-3);
}

.page-start .start-track {
  display: flex;
  align-items: flex-start;
  list-style: none;
  margin: 0;
  padding: var(--space-1) 0 var(--space-2);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-start .start-track:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.page-start .start-track-item {
  position: relative;
  flex: 0 0 auto;
  padding-right: var(--space-6);
}

.page-start .start-track-item::after {
  content: "";
  position: absolute;
  top: calc(var(--start-node) / 2);
  left: var(--start-node);
  right: 0;
  height: var(--border-thin);
  background: var(--color-line);
}

.page-start .start-track-item:last-child {
  padding-right: 0;
}

.page-start .start-track-item:last-child::after {
  display: none;
}

.page-start .start-node {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-ink);
}

.page-start .start-node-dot {
  position: relative;
  z-index: 1;
  box-sizing: border-box;
  width: var(--start-node);
  height: var(--start-node);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-accent);
  transition: background-color var(--start-ease), border-color var(--start-ease);
}

.page-start .start-track-item:first-child .start-node-dot {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.page-start .start-node-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-start .start-node-text {
  font-size: var(--text-sm);
  white-space: nowrap;
  color: var(--color-ink);
  transition: color var(--start-ease);
}

.page-start .start-node:hover .start-node-dot,
.page-start .start-node:focus-visible .start-node-dot {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
}

.page-start .start-node:hover .start-node-text,
.page-start .start-node:focus-visible .start-node-text {
  color: var(--color-primary);
}

.page-start .start-node:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.page-start .start-hero-figure {
  margin: var(--space-6) 0 0;
}

.page-start .start-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 分组骨架 ---------- */
.page-start .start-group {
  padding: var(--section-y) 0;
  background: var(--color-surface);
}

.page-start .start-group--alt {
  background: var(--color-surface-alt);
}

.page-start .start-group--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-start .start-group-body {
  align-items: start;
}

.page-start .start-group-head {
  text-align: center;
  margin-bottom: var(--space-6);
}

.page-start .start-group-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
  margin: 0;
}

.page-start .start-group-title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-2) auto;
  max-width: 22ch;
}

.page-start .start-group-sub {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: 56ch;
  margin: 0 auto;
}

/* 深色分组内的头部 */
.page-start .start-group--deep .start-group-kicker {
  color: var(--color-contrast-accent);
}

.page-start .start-group--deep .start-group-title {
  color: var(--color-contrast-ink);
}

.page-start .start-group--deep .start-group-sub {
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

/* ---------- 步骤条目 ---------- */
.page-start .start-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-start .start-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2) var(--space-3);
  padding: var(--space-4) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-start .start-step:last-child {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-start .start-step-num {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-muted);
  transition: color var(--start-ease);
}

.page-start .start-step-body {
  min-width: 0;
}

.page-start .start-step-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
  transition: color var(--start-ease);
}

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

.page-start .start-step-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-start .start-step-time {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--color-accent);
  white-space: nowrap;
}

.page-start .start-step:hover .start-step-num,
.page-start .start-step:focus-within .start-step-num {
  color: var(--color-primary);
}

.page-start .start-step:hover .start-step-title,
.page-start .start-step:focus-within .start-step-title {
  color: var(--color-primary);
}

/* 深色分组内的步骤条目 */
.page-start .start-group--deep .start-step {
  border-color: var(--color-contrast-line);
}

.page-start .start-group--deep .start-step-num {
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.page-start .start-group--deep .start-step-title {
  color: var(--color-contrast-ink);
}

.page-start .start-group--deep .start-step-text {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-start .start-group--deep .start-step-meta {
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-start .start-group--deep .start-step-time {
  color: var(--color-contrast-accent);
}

.page-start .start-group--deep .start-step:hover .start-step-num,
.page-start .start-group--deep .start-step:focus-within .start-step-num {
  color: var(--color-contrast-accent);
}

.page-start .start-group--deep .start-step:hover .start-step-title,
.page-start .start-group--deep .start-step:focus-within .start-step-title {
  color: var(--color-contrast-accent);
}

/* ---------- 旁注 ---------- */
.page-start .start-aside {
  position: sticky;
  top: var(--space-6);
  padding: var(--space-3);
  background: var(--color-surface);
}

.page-start .start-aside-label {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin: 0;
}

.page-start .start-aside-value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
  margin: var(--space-2) 0 var(--space-3);
  line-height: 1;
}

.page-start .start-aside-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-start .start-aside-list li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-start .start-aside-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--space-2) + 0.7em);
  width: 6px;
  height: var(--border-thin);
  background: var(--color-accent);
}

.page-start .start-aside-figure {
  margin: var(--space-3) 0 0;
}

.page-start .start-aside-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-start .start-figure {
  margin: 0 0 var(--space-4);
}

.page-start .start-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 自查表 ---------- */
.page-start .start-check {
  background: var(--color-surface);
}

.page-start .start-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: var(--start-border-double) double var(--color-line);
}

.page-start .start-table-wrap:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.page-start .start-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.page-start .start-table-caption {
  caption-side: top;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  background: var(--color-surface);
}

.page-start .start-table th,
.page-start .start-table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  vertical-align: top;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-start .start-table thead th {
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-weight: var(--weight-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  border-bottom: var(--start-border-double) double var(--color-line);
}

.page-start .start-table tbody tr:nth-child(even) {
  background: var(--color-surface-alt);
}

.page-start .start-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-start .start-table .cell-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
  white-space: nowrap;
}

.page-start .start-table .cell-time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
  white-space: nowrap;
}

/* ---------- 结尾出口 ---------- */
.page-start .start-next .section-title {
  color: var(--color-contrast-ink);
}

.page-start .start-next .section-sub {
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.page-start .start-next .section-kicker {
  color: var(--color-contrast-accent);
}

.page-start .start-next .title-rule {
  background: var(--color-contrast-accent);
}

.page-start .start-next-grid {
  margin-top: var(--space-6);
}

.page-start .start-next-card {
  display: block;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  text-decoration: none;
  color: var(--color-contrast-ink);
  transition: background-color var(--start-ease), border-color var(--start-ease);
}

.page-start .start-next-card:hover,
.page-start .start-next-card:focus-visible {
  background: color-mix(in srgb, var(--color-contrast-ink) 9%, transparent);
  border-color: var(--color-contrast-accent);
}

.page-start .start-next-card:focus-visible {
  outline: 2px solid var(--color-contrast-accent);
  outline-offset: 3px;
}

.page-start .start-next-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-2);
}

.page-start .start-next-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-2);
}

.page-start .start-next-text {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  margin: 0;
}

.page-start .start-next-contact {
  max-width: var(--measure);
  margin: var(--space-6) auto 0;
  text-align: center;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-start .start-next-contact a {
  color: var(--color-contrast-accent);
  text-underline-offset: 3px;
}

.page-start .start-next-contact a:hover,
.page-start .start-next-contact a:focus-visible {
  color: var(--color-contrast-ink);
}

.page-start .start-next-contact a:focus-visible {
  outline: 2px solid var(--color-contrast-accent);
  outline-offset: 2px;
}

/* ---------- 返回顶部 ---------- */
.page-start .to-top {
  font-family: var(--font-body);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .page-start .start-aside {
    position: static;
    top: auto;
  }

  .page-start .start-group {
    padding: var(--section-y) 0;
  }

  .page-start .start-figure {
    margin-bottom: var(--space-4);
  }
}

@media (max-width: 680px) {
  .page-start .start-hero {
    padding-top: var(--space-6);
  }

  .page-start .start-title {
    max-width: none;
  }

  .page-start .start-hero-line {
    font-size: var(--text-base);
    gap: var(--space-1) var(--space-2);
  }

  .page-start .start-hero-num {
    font-size: var(--text-xl);
  }

  .page-start .start-dot {
    margin: 0 var(--space-1);
  }

  .page-start .start-step {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-1);
  }

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

  .page-start .start-group-title {
    max-width: none;
  }

  .page-start .start-table {
    min-width: 560px;
  }
}