.page-start {
  --start-line: calc(var(--border-thin) * 4);
  --start-node: calc(var(--space-4) + var(--space-1));
  display: block;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-start a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  text-underline-offset: 0.22em;
}

.page-start a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============ 首屏 ============ */
.page-start .start-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  background: linear-gradient(142deg, var(--color-primary) 0%, var(--color-accent) 48%, var(--color-contrast-surface) 100%);
  color: var(--color-primary-ink);
}

.page-start .start-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-start .start-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

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

.page-start .start-hero__inner {
  position: relative;
  z-index: 1;
  padding-block: var(--space-6) var(--space-8);
}

.page-start .start-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-primary-ink) 78%, transparent);
}

.page-start .start-hero .breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.page-start .start-hero .breadcrumb a:hover {
  color: var(--color-primary-ink);
}

.page-start .start-hero .eyebrow {
  margin: var(--space-6) 0 0;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-primary-ink) 82%, transparent);
}

.page-start .start-hero__grid {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.page-start .start-hero__title {
  margin: var(--space-2) 0 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);
  overflow-wrap: anywhere;
  max-width: 7.5em;
}

.page-start .start-hero__intro {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-primary-ink) 88%, transparent);
}

/* 纵向七段进度轨 */
.page-start .start-hero__track {
  position: relative;
  display: grid;
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

.page-start .start-hero__node {
  position: relative;
  display: grid;
  grid-template-columns: var(--start-node) minmax(0, 1fr);
  align-items: center;
  gap: var(--space-3);
}

.page-start .start-hero__node:not(:last-child)::before {
  content: "";
  position: absolute;
  left: calc(var(--start-node) / 2);
  top: calc(var(--start-node) + var(--space-1));
  width: var(--start-line);
  height: var(--space-2);
  transform: translateX(-50%);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-primary-ink) 34%, transparent);
}

.page-start .start-hero__n {
  display: grid;
  place-items: center;
  width: var(--start-node);
  height: var(--start-node);
  border-radius: 50%;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 55%, transparent);
  background: color-mix(in srgb, var(--color-primary-ink) 14%, transparent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
}

.page-start .start-hero__lbl {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-primary-ink) 90%, transparent);
}

/* 首屏数字带 */
.page-start .start-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-4);
  margin: 0;
  padding: var(--space-4) 0 0;
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 32%, transparent);
  list-style: none;
}

.page-start .start-hero__stat {
  display: grid;
  gap: var(--space-1);
  min-width: 0;
}

.page-start .start-hero__stat-num {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-start .start-hero__stat-lbl {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-primary-ink) 76%, transparent);
}

@media (min-width: 900px) {
  .page-start .start-hero__inner {
    padding-block: var(--space-8) calc(var(--space-8) + var(--space-6));
  }

  .page-start .start-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(230px, 300px);
    gap: var(--space-8);
    align-items: start;
  }

  .page-start .start-hero__stats {
    grid-template-columns: minmax(0, 1fr);
    border-top: 0;
    padding-top: 0;
    border-left: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 30%, transparent);
    padding-left: var(--space-6);
  }
}

/* ============ 阶段跳转 ============ */
.page-start .start-jump {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-start .start-jump__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-4);
}

.page-start .start-jump__label {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  margin-right: var(--space-1);
}

.page-start .start-jump .chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 70%, transparent);
  color: var(--color-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: border-color 200ms ease, color 200ms ease, transform 200ms ease;
}

.page-start .start-jump .chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.page-start .start-jump .chip--accent {
  border-color: color-mix(in srgb, var(--color-accent) 45%, transparent);
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 60%, transparent);
}

/* ============ 阶段区块 ============ */
.page-start .start-stage {
  padding-block: var(--section-y);
  border-bottom: var(--border-thin) solid var(--color-line);
}

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

.page-start .start-stage__head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding-left: var(--space-3);
  border-left: var(--start-line) solid var(--color-primary);
}

.page-start .start-stage__tag {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-start .start-stage__tag--accent {
  color: var(--color-accent);
}

.page-start .start-stage__tag--deep {
  color: var(--color-ink-muted);
}

.page-start .start-stage__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-start .start-stage__intro {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

/* ============ 步骤 ============ */
.page-start .start-steps {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-start .start-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  padding-block: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-start .start-steps > .start-step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-start .start-step__num {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.page-start .start-stage--alt .start-step__num {
  color: var(--color-accent);
}

.page-start .start-step__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

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

.page-start .start-step__row {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-left: var(--start-line) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-deep) 55%, transparent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-start .start-step__row--check {
  border-left-color: var(--color-accent);
  background: var(--color-highlight);
}

.page-start .start-step__key {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  font-weight: var(--weight-heading);
}

.page-start .start-step__row--check .start-step__key {
  color: var(--color-accent);
}

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

.page-start .start-step__check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-base);
  color: var(--color-ink);
  cursor: pointer;
}

.page-start .start-step__check input {
  flex: none;
  width: var(--space-3);
  height: var(--space-3);
  margin: 0;
  margin-top: 0.35em;
  accent-color: var(--color-accent);
}

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

@media (min-width: 768px) {
  .page-start .start-step {
    grid-template-columns: minmax(0, 5.4em) minmax(0, 1fr);
    gap: var(--space-4);
    padding-block: var(--space-8);
  }

  .page-start .start-step__num {
    font-size: calc(var(--text-3xl) * 1.8);
    position: sticky;
    top: var(--space-4);
  }

  .page-start .start-step__row {
    grid-template-columns: minmax(0, max-content) minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-4);
  }

  .page-start .start-step__key {
    min-width: 5em;
  }
}

@media (min-width: 1024px) {
  .page-start .start-stage:nth-of-type(odd) .start-step__body {
    max-width: 46rem;
  }
}

/* ============ 阶段配图 ============ */
.page-start .start-figure {
  margin: var(--space-6) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-1);
  background: var(--color-contrast-surface);
}

.page-start .start-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

/* ============ 老用户 ============ */
.page-start .start-veteran {
  position: relative;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y-lg);
}

.page-start .start-veteran__head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding-left: var(--space-3);
  border-left: var(--start-line) solid var(--color-contrast-accent);
}

.page-start .start-veteran__tag {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

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

.page-start .start-veteran__intro {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-start .start-compare {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.page-start .start-compare__col {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
}

.page-start .start-compare__col--old {
  border-color: color-mix(in srgb, var(--color-contrast-accent) 45%, transparent);
  background: color-mix(in srgb, var(--color-contrast-accent) 12%, transparent);
}

.page-start .start-compare__tag {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-start .start-compare__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 88%, transparent);
}

.page-start .start-veteran__list {
  display: grid;
  gap: var(--space-3);
  margin: 0 0 var(--space-6);
  padding: 0;
  list-style: none;
}

.page-start .start-veteran__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: var(--space-3);
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-start .start-veteran__list li:last-child {
  border-bottom: 0;
}

.page-start .start-veteran__list p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
}

.page-start .start-veteran__list a {
  color: var(--color-contrast-accent);
  text-decoration-color: color-mix(in srgb, var(--color-contrast-accent) 55%, transparent);
}

.page-start .status-dot {
  display: block;
  width: var(--space-1);
  height: var(--space-1);
  margin-top: 0.62em;
  border-radius: 50%;
  background: var(--color-contrast-accent);
  box-shadow: 0 0 0 var(--space-1) color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
}

.page-start .start-veteran__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-contrast-accent) 35%, transparent);
  box-shadow: var(--shadow-2);
}

.page-start .start-veteran__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 5 / 3;
  opacity: 0.9;
}

@media (min-width: 768px) {
  .page-start .start-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-start .start-veteran__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-8);
  }
}

/* ============ 下一步 ============ */
.page-start .start-next {
  background: var(--color-surface);
  padding-block: var(--section-y);
}

.page-start .start-next__head {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-start .start-next__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-accent);
  white-space: nowrap;
}

.page-start .start-next__head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-start .start-next__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-start .start-next__item {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-start .start-next__item:last-child {
  border-bottom: 0;
}

.page-start .start-next__item a {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  text-decoration: none;
  width: fit-content;
}

.page-start .start-next__item a:hover {
  text-decoration: underline;
  text-decoration-thickness: var(--border-thin);
  text-underline-offset: 0.24em;
}

.page-start .start-next__item span {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

@media (min-width: 768px) {
  .page-start .start-next__item {
    grid-template-columns: minmax(0, 12em) minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-4);
  }
}

/* ============ 动效协议 ============ */
.page-start [data-reveal] {
  opacity: 1;
}

.page-start.js-on [data-reveal] {
  opacity: 0;
  transform: translateY(var(--space-2));
  transition: opacity 400ms ease, transform 400ms ease;
}

.page-start.js-on [data-reveal].is-inview {
  opacity: 1;
  transform: none;
}

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

  .page-start .start-jump .chip:hover {
    transform: none;
  }
}