.page-scenarios {
  --scenario-accent-soft: color-mix(in srgb, var(--color-accent) 12%, transparent);
  --scenario-primary-wash: color-mix(in srgb, var(--color-primary) 10%, transparent);
  --scenario-rail-pad: 40px;
}

/* ---------- 首屏 ---------- */

.page-scenarios .hero {
  position: relative;
  padding: calc(var(--section-y) * 0.6) 0 calc(var(--section-y) * 0.78);
  background-image:
    radial-gradient(120% 78% at 84% 4%, color-mix(in srgb, var(--color-highlight) 70%, transparent) 0%, transparent 62%),
    radial-gradient(88% 70% at 6% 96%, color-mix(in srgb, var(--color-primary-soft) 90%, transparent) 0%, transparent 68%),
    linear-gradient(168deg, var(--color-surface) 0%, var(--color-surface-alt) 62%, var(--color-surface-deep) 100%);
  background-repeat: no-repeat;
  overflow: hidden;
}

.page-scenarios .hero__container {
  position: relative;
}

.page-scenarios .hero__crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-6);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.page-scenarios .hero__crumbs .crumbs__sep {
  color: var(--color-line);
}

.page-scenarios .hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-scenarios .hero__rail {
  order: 2;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.page-scenarios .hero__main {
  order: 1;
  min-width: 0;
}

.page-scenarios .hero__title {
  margin: var(--space-2) 0 var(--space-4);
  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-ink);
}

.page-scenarios .hero__lede {
  max-width: var(--measure);
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-scenarios .hero__lede p {
  margin: 0 0 var(--space-3);
}

.page-scenarios .hero__lede p:last-child {
  margin-bottom: 0;
}

.page-scenarios .hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-4);
  margin: var(--space-6) 0 0;
  padding: var(--space-4) 0 0;
  list-style: none;
  border-top: 1px dashed var(--color-line);
}

.page-scenarios .hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-scenarios .hero__stat strong {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1.05;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.page-scenarios .hero__stat span {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* 竖向路径示意 */

.page-scenarios .rail {
  position: relative;
  padding-left: var(--scenario-rail-pad);
}

.page-scenarios .rail::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  border-left: 1px dashed var(--color-primary);
  opacity: 0.55;
}

.page-scenarios .rail__node {
  position: relative;
  padding: 0 0 var(--space-4);
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-scenarios .rail__node--last {
  padding-bottom: 0;
}

.page-scenarios .rail__node::before {
  content: "";
  position: absolute;
  left: calc(var(--scenario-rail-pad) * -1);
  top: 3px;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  border: 1px solid var(--color-primary);
}

.page-scenarios .rail__node::after {
  content: "";
  position: absolute;
  left: calc(var(--scenario-rail-pad) * -1 + 4px);
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
}

.page-scenarios .rail__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-scenarios .rail__label {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.25;
  color: var(--color-ink);
}

.page-scenarios .rail__hint {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-soft);
}

.page-scenarios .hero__figure {
  max-width: 340px;
}

.page-scenarios .hero__figure .figure__frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 分组导览条 ---------- */

.page-scenarios .toc {
  position: sticky;
  top: 0;
  z-index: 5;
  padding: var(--space-2) 0;
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px dashed var(--color-line);
}

.page-scenarios .toc__list {
  display: flex;
  gap: var(--space-2);
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-scenarios .toc__list::-webkit-scrollbar {
  display: none;
}

.page-scenarios .toc__item {
  flex: 0 0 auto;
}

.page-scenarios .toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: 6px var(--space-2) 6px var(--space-1);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink);
  text-decoration: none;
  font-size: var(--text-sm);
  white-space: nowrap;
  transition: border-color 240ms cubic-bezier(0.2, 0.7, 0.2, 1),
              background-color 240ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.page-scenarios .toc__link:hover,
.page-scenarios .toc__link:focus-visible {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.page-scenarios .toc__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.page-scenarios .toc__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 分组区块 ---------- */

.page-scenarios .group {
  padding: var(--section-y) 0;
  background: var(--color-surface);
}

.page-scenarios .group--alt {
  background: var(--color-surface-alt);
  border-top: 1px dashed var(--color-line);
  border-bottom: 1px dashed var(--color-line);
}

.page-scenarios .group__head {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

.page-scenarios .group__title {
  margin: var(--space-1) 0 var(--space-3);
  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-ink);
}

.page-scenarios .group__lede {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: 1.7;
}

.page-scenarios .group__figure {
  margin: 0 0 var(--space-6);
  max-width: 820px;
}

.page-scenarios .group__figure .figure__frame img,
.page-scenarios .group__side .figure__frame img,
.page-scenarios .group__tail .figure__frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-scenarios .group__intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.page-scenarios .group__intro .group__head {
  margin-bottom: 0;
}

.page-scenarios .group__side {
  margin: 0;
}

.page-scenarios .group__tail {
  margin: var(--space-6) 0 0;
  max-width: 600px;
}

.page-scenarios .group__list {
  display: flex;
  flex-direction: column;
}

.page-scenarios .group__list > .usecase + .usecase {
  border-top: 1px dashed var(--color-line);
}

/* ---------- 单条用法 ---------- */

.page-scenarios .usecase {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  scroll-margin-top: 80px;
}

.page-scenarios .usecase__index {
  align-self: start;
  position: sticky;
  top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-line);
  transition: color 240ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.page-scenarios .usecase:hover .usecase__index,
.page-scenarios .usecase:focus-within .usecase__index {
  color: var(--color-accent);
}

.page-scenarios .usecase__body {
  min-width: 0;
}

.page-scenarios .usecase__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
  margin-bottom: var(--space-2);
}

.page-scenarios .usecase__title {
  flex: 1 1 220px;
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-scenarios .usecase__device {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
}

.page-scenarios .steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: stepcount;
  max-width: var(--measure);
}

.page-scenarios .steps li {
  position: relative;
  counter-increment: stepcount;
  padding: 0 0 var(--space-2) calc(var(--space-4) + 4px);
  color: var(--color-ink);
  font-size: var(--text-base);
  line-height: 1.7;
}

.page-scenarios .steps li:last-child {
  padding-bottom: 0;
}

.page-scenarios .steps li::before {
  content: counter(stepcount, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.page-scenarios .steps code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  padding: 1px 5px;
  border-radius: 6px;
  background: var(--color-primary-soft);
  color: var(--color-ink);
}

.page-scenarios .usecase__note,
.page-scenarios .usecase__confirm {
  max-width: var(--measure);
  margin: var(--space-2) 0 0;
  padding-left: calc(var(--space-4) + 4px);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-scenarios .usecase__note {
  border-left: 2px solid var(--color-highlight);
}

.page-scenarios .usecase__confirm {
  border-left: 2px solid var(--color-primary);
}

.page-scenarios .usecase__key {
  display: inline-block;
  margin-right: var(--space-1);
  padding: 1px 7px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

.page-scenarios .usecase__confirm .usecase__key {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

/* ---------- 结果确认 ---------- */

.page-scenarios .checks-section {
  background: var(--color-surface);
}

.page-scenarios .checks {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.page-scenarios .check {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-scenarios .check[open] {
  border-color: var(--color-primary);
}

.page-scenarios .check__summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-3);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
}

.page-scenarios .check__summary::-webkit-details-marker {
  display: none;
}

.page-scenarios .check__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-ink-muted);
}

.page-scenarios .check[open] .check__summary::after {
  content: "–";
  color: var(--color-primary);
}

.page-scenarios .check__mark {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

.page-scenarios .check__mark--ok {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-scenarios .check__mark--off {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-scenarios .check__body {
  padding: 0 var(--space-3) var(--space-3);
}

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

.page-scenarios .check__list li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-scenarios .check__list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  width: 12px;
  border-top: 1px dashed var(--color-primary);
}

/* ---------- 相邻路径 ---------- */

.page-scenarios .next-path {
  background-image:
    radial-gradient(90% 120% at 12% 0%, color-mix(in srgb, var(--color-primary-soft) 80%, transparent) 0%, transparent 62%);
  background-repeat: no-repeat;
}

.page-scenarios .next-path__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-scenarios .next-path__text {
  max-width: var(--measure);
}

.page-scenarios .next-path__links {
  display: grid;
  gap: var(--space-2);
}

.page-scenarios .next-path__link {
  display: grid;
  gap: 2px;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--color-line);
  background: var(--color-surface);
  text-decoration: none;
  transition: border-color 240ms cubic-bezier(0.2, 0.7, 0.2, 1),
              background-color 240ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.page-scenarios .next-path__link:hover,
.page-scenarios .next-path__link:focus-visible {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.page-scenarios .next-path__link-k {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.page-scenarios .next-path__link-v {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
}

/* ---------- 断点 ---------- */

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

  .page-scenarios .usecase {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: var(--space-4);
    padding: var(--space-6) 0;
  }

  .page-scenarios .usecase__index {
    position: static;
    font-size: var(--text-3xl);
  }

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

  .page-scenarios .checks .check:last-child {
    grid-column: 1 / -1;
  }

  .page-scenarios .next-path__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-scenarios .hero {
    padding: calc(var(--section-y-lg) * 0.62) 0 calc(var(--section-y) * 0.9);
  }

  .page-scenarios .hero__grid {
    grid-template-columns: minmax(240px, 4fr) minmax(0, 8fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-scenarios .hero__rail {
    order: 1;
  }

  .page-scenarios .hero__main {
    order: 2;
  }

  .page-scenarios .group__intro {
    grid-template-columns: minmax(0, 1fr) 360px;
    align-items: end;
    gap: var(--space-6);
  }

  .page-scenarios .next-path__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-8);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-scenarios .toc__link,
  .page-scenarios .usecase__index,
  .page-scenarios .next-path__link {
    transition: none;
  }

  .page-scenarios .toc {
    backdrop-filter: none;
  }
}