.page-solutions {
  --sol-rail: clamp(46px, 7vw, 88px);
  background: var(--color-surface);
  color: var(--color-ink);
}

/* ---------- 首屏 ---------- */
.page-solutions .sol-hero {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-6) 0 var(--space-8);
  overflow: hidden;
}

.page-solutions .sol-hero__crumb {
  margin-bottom: var(--space-6);
}

.page-solutions .sol-hero__crumb,
.page-solutions .sol-hero__crumb a,
.page-solutions .sol-hero__crumb li,
.page-solutions .sol-hero__crumb li + li::before {
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

.page-solutions .sol-hero__crumb a:hover {
  opacity: 1;
}

.page-solutions .sol-hero__grid {
  display: grid;
  gap: var(--space-6);
  align-items: end;
}

.page-solutions .sol-hero__eyebrow {
  color: var(--color-contrast-accent);
}

.page-solutions .sol-hero__title {
  margin: var(--space-3) 0 var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.06;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-solutions .sol-hero__lead {
  max-width: 46ch;
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-solutions .sol-hero__viz {
  min-width: 0;
}

.page-solutions .sol-axis {
  display: block;
  width: 100%;
  height: auto;
}

.page-solutions .sol-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-4);
  margin: var(--space-8) 0 0;
  padding: var(--space-4) 0 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  list-style: none;
}

.page-solutions .sol-figure-num {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-solutions .sol-figure-label {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  opacity: 0.68;
}

/* ---------- 通用图注 ---------- */
.page-solutions .sol-figure {
  margin: 0;
}

.page-solutions .sol-figure .figure__media {
  overflow: hidden;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

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

.page-solutions .sol-figure .figure__caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 总览 ---------- */
.page-solutions .sol-overview__head {
  margin-bottom: var(--space-6);
}

.page-solutions .sol-figure--wide {
  margin-top: var(--space-6);
}

.page-solutions .sol-index {
  margin-top: var(--space-6);
}

.page-solutions .sol-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin: 0;
  padding: var(--space-3) 0 0;
  border-top: var(--border-thin) solid var(--color-line);
  list-style: none;
  font-size: var(--text-sm);
}

.page-solutions .sol-index a {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
}

.page-solutions .sol-index a:hover,
.page-solutions .sol-index a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-solutions .sol-index .num {
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

/* ---------- 步骤时间轴 ---------- */
.page-solutions .sol-timeline {
  margin-top: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-solutions .sol-step {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-solutions .sol-step__head {
  display: grid;
  grid-template-columns: var(--sol-rail) minmax(0, 1fr);
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-4) 0;
  cursor: pointer;
  list-style: none;
}

.page-solutions .sol-step__head::-webkit-details-marker {
  display: none;
}

.page-solutions .sol-step__head:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

.page-solutions .sol-step__index {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  letter-spacing: 0.02em;
  color: var(--color-primary);
}

.page-solutions .sol-step__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-solutions .sol-step[open] .sol-step__title {
  color: var(--color-ink);
}

.page-solutions .sol-step__body {
  padding: 0 0 var(--space-6);
}

.page-solutions .sol-fields {
  display: grid;
  gap: var(--space-4);
  margin: 0;
}

.page-solutions .sol-field dt {
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

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

.page-solutions .sol-field--note {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-accent);
}

.page-solutions .sol-field--check {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-primary);
}

/* ---------- 三类方案 ---------- */
.page-solutions .sol-schemes__tabs {
  margin-top: var(--space-2);
}

.page-solutions .sol-schemes .tab {
  background: none;
  border: 0;
  border-bottom: var(--border-thin) solid transparent;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: color 200ms ease, border-color 200ms ease;
}

.page-solutions .sol-schemes .tab[aria-selected="true"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

.page-solutions .sol-schemes .tab:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: -2px;
}

.page-solutions .sol-schemes__figure {
  margin-top: var(--space-6);
}

.page-solutions .sol-panel {
  padding-top: var(--space-6);
}

.page-solutions .sol-panel[hidden] {
  display: none;
}

.page-solutions .sol-panel__grid {
  display: grid;
  gap: var(--space-6);
}

.page-solutions .sol-panel__title {
  margin: 0 0 var(--space-3);
  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-solutions .sol-panel__main p {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-solutions .sol-panel__main p:last-child {
  margin-bottom: 0;
}

.page-solutions .sol-route-list {
  display: grid;
  gap: var(--space-3);
  align-content: start;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-solutions .sol-route-list li {
  display: grid;
  gap: var(--space-1);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-solutions .sol-route-list li:first-child {
  border-top-color: var(--color-accent);
}

.page-solutions .sol-route-list strong {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-solutions .sol-route-steps {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

.page-solutions .sol-route-list span:last-child {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 口径与判定 ---------- */
.page-solutions .sol-notes-layout {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-2);
}

.page-solutions .sol-notes {
  display: grid;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-solutions .sol-notes li {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-solutions .sol-notes li:first-child {
  border-left-color: var(--color-accent);
}

.page-solutions .sol-notes__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-solutions .sol-notes li p {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-solutions .sol-notes__figure {
  align-self: start;
}

.page-solutions .sol-confirm {
  margin-top: var(--space-8);
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-4);
  background: var(--color-highlight);
  border-left: var(--border-thick) solid var(--color-accent);
}

.page-solutions .sol-confirm__title {
  margin: 0 0 var(--space-2);
  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-solutions .sol-confirm__lead {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-solutions .sol-confirm__list {
  display: grid;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
}

.page-solutions .sol-confirm__list li {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-solutions .sol-confirm__list .num {
  display: inline-block;
  min-width: 1.4em;
  margin-right: var(--space-1);
  font-family: var(--font-heading);
  color: var(--color-accent);
}

.page-solutions .sol-confirm__foot {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.page-solutions .sol-confirm__foot a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary);
}

.page-solutions .sol-confirm__foot a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 范围之外 ---------- */
.page-solutions .sol-boundary__grid {
  display: grid;
  gap: var(--space-6);
}

.page-solutions .sol-boundary__list {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-solutions .sol-boundary__list li {
  display: grid;
  gap: var(--space-1);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-solutions .sol-boundary__list li:first-child {
  border-top-color: var(--color-primary);
}

.page-solutions .sol-boundary__list strong {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-solutions .sol-boundary__list span {
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

.page-solutions .sol-exits {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.page-solutions .sol-exit {
  position: relative;
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6) var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
  color: inherit;
  text-decoration: none;
  transition: border-color 200ms ease;
}

.page-solutions .sol-exit:hover,
.page-solutions .sol-exit:focus-visible {
  border-top-color: var(--color-accent);
}

.page-solutions .sol-exit__label {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-solutions .sol-exit__note {
  max-width: 46ch;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

.page-solutions .sol-exit__arrow {
  position: absolute;
  top: var(--space-4);
  right: 0;
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-primary);
}

.page-solutions .sol-exit:hover .sol-exit__arrow {
  color: var(--color-accent);
}

/* ---------- 收束 ---------- */
.page-solutions .sol-closing__layout {
  display: grid;
  gap: var(--space-6);
}

.page-solutions .sol-closing__copy p {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-solutions .sol-closing__copy p:last-child {
  margin-bottom: 0;
}

.page-solutions .sol-closing__figure {
  align-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-solutions .sol-step__body {
    padding-left: calc(var(--sol-rail) + var(--space-3));
  }
}

@media (min-width: 720px) {
  .page-solutions .sol-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-solutions .sol-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4) var(--space-6);
  }

  .page-solutions .sol-field--check {
    grid-column: 1 / -1;
  }

  .page-solutions .sol-exits {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-solutions .sol-hero {
    padding: var(--space-8) 0 var(--space-8);
  }

  .page-solutions .sol-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: var(--space-8);
  }

  .page-solutions .sol-panel__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: var(--space-8);
  }

  .page-solutions .sol-notes-layout {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 340px);
    gap: var(--space-8);
  }

  .page-solutions .sol-boundary__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-solutions .sol-closing__layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 360px);
    gap: var(--space-8);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-solutions .sol-index a,
  .page-solutions .sol-exit,
  .page-solutions .sol-schemes .tab {
    transition: none;
  }
}
<<<END>>>