.page-guarantee {
  --pg-bar-bg: color-mix(in srgb, var(--color-contrast-surface) 74%, transparent);
  --pg-soft-ink: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

/* ---------- 首屏 ---------- */

.page-guarantee .hero {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--space-8) var(--space-6);
  border-bottom: 3px double var(--color-contrast-line);
}

.page-guarantee .hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-guarantee .hero__media .media-frame,
.page-guarantee .hero__media .media-frame--wide {
  position: absolute;
  inset: 0;
  margin: 0;
  border: 0;
  opacity: 0.34;
}

.page-guarantee .hero__media .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-guarantee .hero__media .media-frame__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

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

.page-guarantee .hero__kicker {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

.page-guarantee .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: -0.012em;
  color: var(--color-contrast-ink);
  max-width: 20ch;
}

.page-guarantee .hero__lead {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--pg-soft-ink);
}

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

.page-guarantee .hero__bars {
  display: grid;
  gap: var(--space-2);
}

.page-guarantee .commit-bar {
  border: 3px double var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: var(--pg-bar-bg);
}

.page-guarantee .commit-bar__head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  list-style: none;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-guarantee .commit-bar__head::-webkit-details-marker {
  display: none;
}

.page-guarantee .commit-bar__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-guarantee .commit-bar[open] .commit-bar__head::after {
  content: "–";
}

.page-guarantee .commit-bar__head:hover,
.page-guarantee .commit-bar__head:focus-visible {
  border-color: var(--color-contrast-accent);
}

.page-guarantee .commit-bar__tag {
  flex: none;
  padding: 0 var(--space-1);
  border: var(--border-thin) solid var(--color-contrast-accent);
  color: var(--color-contrast-accent);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}

.page-guarantee .commit-bar__text {
  min-width: 0;
}

.page-guarantee .commit-bar__body {
  margin: 0;
  padding: var(--space-2) var(--space-3) var(--space-3);
  border-top: var(--border-thin) dotted var(--color-contrast-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--pg-soft-ink);
}

.page-guarantee .hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  align-content: start;
}

.page-guarantee .fig {
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-top: var(--space-2);
}

.page-guarantee .fig__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-guarantee .fig__unit {
  margin-left: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.page-guarantee .fig__note {
  margin: var(--space-1) 0 0;
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--pg-soft-ink);
}

/* ---------- 正文骨架 ---------- */

.page-guarantee .pg-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding-block: var(--section-y);
}

.page-guarantee .pg-index {
  border-top: 3px double var(--color-line);
  padding-top: var(--space-2);
}

.page-guarantee .chapter-index__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-guarantee .chapter-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-2) 0 0;
  padding: 0;
  list-style: none;
}

.page-guarantee .index-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-guarantee .index-link:hover,
.page-guarantee .index-link:focus-visible {
  color: var(--color-primary);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.page-guarantee .pg-flow {
  min-width: 0;
}

.page-guarantee .pg-section {
  border-top: 3px double var(--color-line);
  padding-top: var(--space-4);
  margin-bottom: var(--space-8);
}

.page-guarantee .pg-flow > .pg-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-guarantee .pg-head {
  margin-bottom: var(--space-3);
}

.page-guarantee .pg-kicker {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent);
}

.page-guarantee .pg-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-guarantee .pg-text {
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-guarantee .pg-text--after {
  margin-top: var(--space-4);
  margin-bottom: 0;
  color: var(--color-ink-soft);
}

.page-guarantee .pg-note {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

.page-guarantee .pg-note a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图文分栏 ---------- */

.page-guarantee .pg-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: start;
  margin-block: var(--space-4);
}

.page-guarantee .pg-media {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  overflow: hidden;
}

.page-guarantee img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-guarantee .pg-media img {
  width: 100%;
  object-fit: cover;
}

/* ---------- 参数表 ---------- */

.page-guarantee .pg-table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.page-guarantee .pg-table {
  width: 100%;
  min-width: 380px;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.page-guarantee .pg-caption {
  caption-side: top;
  text-align: left;
  padding: var(--space-2) var(--space-2) 0;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-guarantee .pg-table th,
.page-guarantee .pg-table td {
  text-align: left;
  padding: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
}

.page-guarantee .pg-table thead th {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  background: var(--color-surface-deep);
}

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

/* ---------- 适用 / 例外 对照 ---------- */

.page-guarantee .pg-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-guarantee .pg-duo__col {
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  padding: var(--space-3);
}

.page-guarantee .pg-duo__col--muted {
  border-left-color: var(--color-ink-muted);
  border-style: dashed;
  background: var(--color-surface-deep);
}

.page-guarantee .pg-duo__label {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
}

.page-guarantee .pg-duo__col:not(.pg-duo__col--muted) .pg-duo__label {
  color: var(--color-primary);
}

/* ---------- 列表 ---------- */

.page-guarantee .pg-list {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-guarantee .pg-list li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-guarantee .pg-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--space-1) * 1.6);
  width: var(--space-1);
  height: var(--border-thick);
  background: var(--color-accent);
}

.page-guarantee .pg-list strong {
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.page-guarantee .pg-list--tight li {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 起订档位面板 ---------- */

.page-guarantee .pg-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-guarantee .pg-panel {
  position: relative;
  border: 3px double var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  padding: var(--space-4) var(--space-3) var(--space-3);
}

.page-guarantee .pg-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: calc(var(--space-1) / 2);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-primary) 0,
    var(--color-primary) var(--space-1),
    transparent var(--space-1),
    transparent calc(var(--space-1) * 2)
  );
}

.page-guarantee .pg-panel__tag {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-guarantee .pg-panel__num {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.page-guarantee .pg-panel__unit {
  margin: var(--space-1) 0 var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-guarantee .pg-panel__desc {
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) dotted var(--color-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 收尾出口 ---------- */

.page-guarantee .pg-out {
  border-top: 3px double var(--color-primary);
  padding-top: var(--space-4);
}

.page-guarantee .pg-out__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);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

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

.page-guarantee .pg-out__links {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-guarantee .pg-link {
  display: block;
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) dotted var(--color-line);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
  text-decoration: none;
}

.page-guarantee .pg-link::after {
  content: " →";
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.page-guarantee .pg-link:hover,
.page-guarantee .pg-link:focus-visible {
  color: var(--color-primary);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

/* ---------- 焦点可达性 ---------- */

.page-guarantee .index-link:focus-visible,
.page-guarantee .pg-link:focus-visible,
.page-guarantee .commit-bar__head:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-guarantee .pg-duo,
  .page-guarantee .pg-panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-guarantee .pg-body {
    grid-template-columns: 18ch minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-guarantee .pg-index {
    position: sticky;
    top: var(--space-4);
  }

  .page-guarantee .chapter-index__list {
    flex-direction: column;
    gap: var(--space-1);
  }

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

  .page-guarantee .hero__figures {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-guarantee .commit-bar,
  .page-guarantee .pg-section,
  .page-guarantee .pg-out {
    transition: none;
  }
}
<<<END>>>
</main>