.page-disclaimer {
  --usage-num-col: 2.25rem;
  --usage-toc-w: 15rem;
  --usage-card-w: 13rem;
  padding-bottom: 4rem;
}

.page-disclaimer .breadcrumb {
  margin: 1.5rem 0 1.5rem;
}

/* ---------- 页头 ---------- */
.page-disclaimer .usage-intro {
  border-top: 1px solid var(--line-strong);
  padding-top: 1.4rem;
  margin-bottom: 2rem;
}

.page-disclaimer .usage-intro h1 {
  margin: 0.7rem 0 1rem;
  max-width: 22ch;
}

.page-disclaimer .usage-intro__lead {
  margin: 0 0 1.5rem;
  max-width: 58ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--paper-soft);
}

.page-disclaimer .version-fold {
  max-width: 44rem;
  background: rgba(23, 69, 58, 0.45);
  border: 1px solid var(--line);
  border-left: 2px solid var(--clay);
}

.page-disclaimer .version-fold > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-disclaimer .version-fold > summary::-webkit-details-marker {
  display: none;
}

.page-disclaimer .version-fold > summary::after {
  content: "+";
  font-size: 0.9rem;
  line-height: 1;
  color: var(--clay);
}

.page-disclaimer .version-fold[open] > summary::after {
  content: "−";
}

.page-disclaimer .version-fold__body {
  padding: 0 1rem 1rem;
  border-top: 1px dashed var(--line);
}

.page-disclaimer .version-fold__body p {
  margin: 0.85rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--paper-soft);
  max-width: 58ch;
}

/* ---------- 顶部主视觉 ---------- */
.page-disclaimer .usage-visual {
  margin: 0 0 3rem;
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(23, 69, 58, 0.7), rgba(16, 22, 20, 0.9));
}

.page-disclaimer .usage-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-disclaimer .usage-visual .media-frame__cap {
  display: block;
  padding: 0.65rem 1rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-disclaimer .usage-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-disclaimer .usage-toc {
  border-top: 1px solid var(--line-strong);
  padding-top: 0.9rem;
}

.page-disclaimer .usage-toc__list {
  list-style: none;
  margin: 0.7rem 0 0;
  padding: 0 0 0.3rem;
  display: flex;
  flex-direction: row;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-disclaimer .usage-toc__list li {
  flex: 0 0 auto;
}

.page-disclaimer .usage-toc__list a {
  display: block;
  padding: 0.3rem 0.55rem;
  border-bottom: 2px solid transparent;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-disclaimer .usage-toc__list a:hover,
.page-disclaimer .usage-toc__list a.is-current {
  color: var(--paper);
  border-bottom-color: var(--flare);
}

/* ---------- 章节 ---------- */
.page-disclaimer .rule-group {
  padding-top: 0.5rem;
  margin-bottom: 3rem;
}

.page-disclaimer .rule-group:last-of-type {
  margin-bottom: 0;
}

.page-disclaimer .rule-group__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: 0.25rem;
}

.page-disclaimer .rule-group__head .mono-tag {
  white-space: nowrap;
}

/* ---------- 条目清单 ---------- */
.page-disclaimer .rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-disclaimer .rule-item {
  display: grid;
  grid-template-columns: var(--usage-num-col) 1fr;
  gap: 0.5rem 0.85rem;
  padding: 1.2rem 0.75rem;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color 200ms var(--ease);
}

.page-disclaimer .rule-item:hover,
.page-disclaimer .rule-item:focus-within {
  background-color: rgba(23, 69, 58, 0.42);
}

.page-disclaimer .rule-item__num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--amber);
}

.page-disclaimer .rule-item__body h3 {
  margin: 0 0 0.45rem;
  font-size: 1.0625rem;
  line-height: 1.5;
  letter-spacing: -0.01em;
}

.page-disclaimer .rule-item__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--paper-soft);
}

.page-disclaimer .rule-item__body p + p {
  margin-top: 0.55rem;
}

.page-disclaimer .rule-item__link {
  font-size: 0.8125rem !important;
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

.page-disclaimer .rule-item__link a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px dashed var(--line-strong);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-disclaimer .rule-item__link a:hover,
.page-disclaimer .rule-item__link a:focus-visible {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

/* ---------- 条目补充说明 ---------- */
.page-disclaimer .rule-item__note {
  margin-top: 0.65rem;
}

.page-disclaimer .rule-item__note > summary {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  list-style: none;
  padding-bottom: 0.1rem;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color 180ms var(--ease);
}

.page-disclaimer .rule-item__note > summary::-webkit-details-marker {
  display: none;
}

.page-disclaimer .rule-item__note > summary::before {
  content: "▸";
  font-size: 0.6rem;
  color: var(--clay);
}

.page-disclaimer .rule-item__note[open] > summary::before {
  content: "▾";
}

.page-disclaimer .rule-item__note > summary:hover {
  color: var(--paper);
}

.page-disclaimer .rule-item__note > p {
  margin: 0.7rem 0 0;
  max-width: 54ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 横向刻度轨道 ---------- */
.page-disclaimer .rail {
  margin: 1.75rem 0 1.5rem;
  padding-bottom: 0.8rem;
}

.page-disclaimer .pace-card {
  flex: 0 0 auto;
  width: var(--usage-card-w);
  padding: 1rem;
  background: rgba(23, 69, 58, 0.5);
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
  box-shadow: var(--shadow-paper);
}

.page-disclaimer .pace-card__when {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-disclaimer .pace-card__name {
  margin: 0.55rem 0 0.4rem;
  font-size: 1.125rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.page-disclaimer .pace-card__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--paper-soft);
}

/* ---------- 中段安静分隔 ---------- */
.page-disclaimer .quiet-break {
  margin: 2.5rem 0 3rem;
  padding: 3rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: radial-gradient(120% 160% at 50% 50%, rgba(23, 69, 58, 0.55), rgba(16, 22, 20, 0) 70%);
  text-align: center;
}

.page-disclaimer .quiet-break p {
  margin: 0 auto;
  max-width: 24ch;
  font-size: 1.375rem;
  line-height: 1.6;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
}

/* ---------- 收束条 ---------- */
.page-disclaimer .followup {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin-top: 1.75rem;
  padding: 1.25rem 1.25rem 1.25rem 1.5rem;
  border: 1px solid var(--flare);
  border-left-width: 3px;
  background: rgba(255, 106, 31, 0.08);
}

.page-disclaimer .followup__text {
  margin: 0;
  max-width: 42ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-disclaimer {
    --usage-card-w: 15rem;
    --usage-num-col: 2.75rem;
  }

  .page-disclaimer .rule-item {
    padding: 1.4rem 1rem;
  }

  .page-disclaimer .rule-group {
    margin-bottom: 3.5rem;
  }
}

@media (min-width: 960px) {
  .page-disclaimer .usage-body {
    grid-template-columns: var(--usage-toc-w) minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-disclaimer .usage-toc {
    position: sticky;
    top: 1.5rem;
  }

  .page-disclaimer .usage-toc__list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-disclaimer .usage-toc__list a {
    border-bottom: none;
    border-left: 2px solid transparent;
    padding: 0.32rem 0 0.32rem 0.7rem;
    white-space: normal;
  }

  .page-disclaimer .usage-toc__list a:hover,
  .page-disclaimer .usage-toc__list a.is-current {
    border-bottom-color: transparent;
    border-left-color: var(--flare);
  }

  .page-disclaimer .usage-visual {
    margin-bottom: 3.5rem;
  }

  .page-disclaimer .quiet-break {
    margin: 3rem 0 3.5rem;
    padding: 4rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .rule-item,
  .page-disclaimer .rule-item__note > summary,
  .page-disclaimer .rule-item__link a,
  .page-disclaimer .usage-toc__list a {
    transition: none;
  }
}