.page-disclaimer {
  --usage-num-w: 3.6rem;
  --usage-num-w-sm: 2.6rem;
  background: var(--snow);
  color: var(--ink);
}

.page-disclaimer .breadcrumbs {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  padding: clamp(1.75rem, 4.5vw, 3rem) 0 clamp(2.25rem, 5vw, 3.75rem);
}

.page-disclaimer .usage-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-disclaimer .usage-hero__text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-disclaimer .usage-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 18ch;
}

.page-disclaimer .usage-hero__lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-disclaimer .usage-hero__meta {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  padding-top: 0.35rem;
  border-top: 1px solid var(--hairline);
}

.page-disclaimer .usage-hero__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  background: var(--sand);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-micro);
}

.page-disclaimer .usage-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 章节索引 ---------- */
.page-disclaimer .usage-index {
  padding-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.page-disclaimer .usage-index__panel {
  background: var(--charcoal);
  color: var(--snow);
  border: 1px solid var(--hairline-dark);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  box-shadow: var(--shadow-lift);
}

.page-disclaimer .usage-index__head h2 {
  margin: 0.5rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.25rem, 2.6vw, 1.85rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-disclaimer .usage-index__list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.85rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--hairline-dark);
}

.page-disclaimer .usage-index__list li {
  border-bottom: 1px solid var(--hairline-dark);
}

.page-disclaimer .usage-index__list a {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0.25rem;
  text-decoration: none;
  color: var(--on-dark);
  font-size: 0.98rem;
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-disclaimer .usage-index__list a:hover,
.page-disclaimer .usage-index__list a:focus-visible {
  color: var(--snow);
  background-color: rgba(252, 251, 247, 0.05);
}

.page-disclaimer .usage-index__no {
  font-size: 0.8125rem;
  color: var(--orange);
}

.page-disclaimer .usage-index__hint {
  display: none;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

/* ---------- 章节面板 ---------- */
.page-disclaimer .usage-section {
  padding: clamp(1.25rem, 3vw, 1.75rem) 0;
}

.page-disclaimer .usage-section--sand {
  background: var(--sand);
  padding: clamp(1.75rem, 4vw, 2.75rem) 0;
}

.page-disclaimer .usage-panel {
  display: grid;
  gap: clamp(0.85rem, 2.5vw, 1.75rem);
  padding: clamp(1.35rem, 3.5vw, 2.5rem);
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow-micro);
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-disclaimer .usage-panel:hover {
  border-color: rgba(0, 194, 168, 0.55);
  box-shadow: var(--shadow-lift);
}

.page-disclaimer .usage-panel__num {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  padding-left: 0.75rem;
  border-left: 2px solid var(--orange);
}

.page-disclaimer .usage-panel__body h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.35rem, 3vw, 2.05rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.page-disclaimer .usage-panel__lede {
  margin: 0.75rem 0 0;
  max-width: 62ch;
  line-height: 1.75;
  color: var(--ink-soft);
  font-size: 1rem;
}

.page-disclaimer .usage-clause-list {
  list-style: none;
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-disclaimer .usage-clause-list li {
  display: grid;
  grid-template-columns: var(--usage-num-w-sm) minmax(0, 1fr);
  gap: 0.75rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed var(--hairline);
}

.page-disclaimer .usage-clause-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-disclaimer .usage-clause-list__no {
  font-size: 0.75rem;
  line-height: 1.9;
  color: var(--green-deep);
}

.page-disclaimer .usage-clause-list p {
  margin: 0;
  font-size: 0.9875rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-disclaimer .usage-panel__foot {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.9375rem;
  color: var(--ink-mute);
}

/* ---------- 链接下划线动效 ---------- */
.page-disclaimer .usage-link {
  position: relative;
  display: inline-block;
  color: var(--charcoal);
  font-weight: 600;
  text-decoration: none;
  padding-bottom: 1px;
}

.page-disclaimer .usage-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s var(--ease);
}

.page-disclaimer .usage-link:hover,
.page-disclaimer .usage-link:focus-visible {
  color: var(--orange-deep);
}

.page-disclaimer .usage-link:hover::after,
.page-disclaimer .usage-link:focus-visible::after {
  transform: scaleX(1);
}

/* ---------- 回到顶部 ---------- */
.page-disclaimer .usage-toback {
  display: flex;
  justify-content: flex-start;
  padding: clamp(1.75rem, 4vw, 2.75rem) 0 clamp(2.75rem, 6vw, 4rem);
}

.page-disclaimer .usage-toback__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-disclaimer .usage-toback__arrow {
  display: inline-block;
  font-family: var(--font-mono);
  transition: transform 0.3s var(--ease);
}

.page-disclaimer .usage-toback__btn:hover .usage-toback__arrow,
.page-disclaimer .usage-toback__btn:focus-visible .usage-toback__arrow {
  transform: translateY(-3px);
}

.page-disclaimer .usage-toback__btn:hover,
.page-disclaimer .usage-toback__btn:focus-visible {
  border-color: var(--cyan);
  color: var(--orange-deep);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-disclaimer .usage-index__list a {
    grid-template-columns: 3rem minmax(0, 1fr) auto;
    padding: 1rem 0.5rem;
  }

  .page-disclaimer .usage-index__hint {
    display: inline;
  }

  .page-disclaimer .usage-clause-list li {
    grid-template-columns: var(--usage-num-w) minmax(0, 1fr);
    gap: 1rem;
  }
}

@media (min-width: 960px) {
  .page-disclaimer .usage-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-disclaimer .usage-panel {
    grid-template-columns: 6rem minmax(0, 1fr);
    align-items: start;
  }

  .page-disclaimer .usage-panel__num {
    margin-top: 0.35rem;
  }
}