.page-disclaimer {
  --usage-toc-w: 216px;
  --usage-measure: 68ch;
}

/* 首屏 */
.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2rem, 4.5vw, 3.25rem);
  background: var(--c-ink);
  border-bottom: 1px solid var(--c-line);
}
.page-disclaimer .usage-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
  opacity: 0.34;
  filter: saturate(0.85) contrast(1.05);
}
.page-disclaimer .usage-hero__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 12% 20%, rgba(7, 17, 31, 0.92) 0%, rgba(7, 17, 31, 0.62) 52%, rgba(7, 17, 31, 0.9) 100%),
    linear-gradient(180deg, rgba(7, 17, 31, 0.55) 0%, rgba(7, 17, 31, 0.96) 100%);
}
.page-disclaimer .usage-hero__inner {
  position: relative;
  z-index: 1;
}
.page-disclaimer .usage-hero__title {
  max-width: 22ch;
  margin: 0.6rem 0 0;
  color: var(--c-paper);
  font-family: var(--font-head);
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.page-disclaimer .usage-hero__lead {
  max-width: 56ch;
  margin-top: 1rem;
  color: var(--c-text-soft);
  font-size: clamp(0.95rem, 1.5vw, 1.0625rem);
  line-height: 1.75;
}
.page-disclaimer .usage-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(27, 43, 68, 0.9);
}

/* 主体两栏 */
.page-disclaimer .usage-layout {
  padding-top: clamp(1.75rem, 4vw, 3rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}
.page-disclaimer .usage-toc {
  margin-bottom: 2rem;
  padding: 1rem 0 1.25rem;
  border-top: 2px solid var(--c-amber);
  border-bottom: 1px solid var(--c-line);
}
.page-disclaimer .usage-toc__title {
  margin: 0 0 0.75rem;
  color: var(--c-mist);
  font-family: var(--font-head);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.page-disclaimer .usage-toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.25rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-disclaimer .usage-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  color: var(--c-text-soft);
  font-size: 0.875rem;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease), background-color var(--t) var(--ease);
}
.page-disclaimer .usage-toc__link .yb-num {
  color: var(--c-amber);
  font-size: 0.75rem;
}
.page-disclaimer .usage-toc__link:hover,
.page-disclaimer .usage-toc__link:focus-visible {
  border-color: var(--c-mint);
  background: rgba(53, 242, 192, 0.06);
  color: var(--c-paper);
}
.page-disclaimer .usage-top {
  display: inline-block;
  margin-top: 1rem;
  color: var(--c-mist);
  font-size: 0.8125rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.page-disclaimer .usage-top:hover,
.page-disclaimer .usage-top:focus-visible {
  color: var(--c-mint);
  border-bottom-color: var(--c-mint);
}

/* 条款 */
.page-disclaimer .usage-body {
  max-width: var(--usage-measure);
}
.page-disclaimer .usage-clause {
  position: relative;
  padding: 1.5rem 0 1.75rem 1.125rem;
  border-left: 2px solid var(--c-line);
  border-bottom: 1px solid rgba(27, 43, 68, 0.7);
  transition: border-left-color var(--t) var(--ease), background-color var(--t) var(--ease);
}
.page-disclaimer .usage-clause:first-child {
  padding-top: 0.25rem;
}
.page-disclaimer .usage-clause:hover,
.page-disclaimer .usage-clause:focus-within {
  border-left-color: var(--c-mint);
  background: linear-gradient(90deg, rgba(53, 242, 192, 0.05), transparent 70%);
}
.page-disclaimer .usage-clause:target {
  border-left-color: var(--c-amber);
  background: linear-gradient(90deg, rgba(255, 181, 71, 0.07), transparent 70%);
}
.page-disclaimer .usage-clause__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}
.page-disclaimer .usage-clause__no {
  color: var(--c-amber);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
}
.page-disclaimer .usage-clause__title {
  margin: 0;
  color: var(--c-paper);
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 2.2vw, 1.625rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.page-disclaimer .usage-clause__body p {
  margin: 0 0 0.9rem;
  color: var(--c-text-soft);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
}
.page-disclaimer .usage-clause__body p:last-child {
  margin-bottom: 0;
}
.page-disclaimer .usage-flag {
  display: inline-block;
  margin-right: 0.4rem;
  padding: 0.05rem 0.5rem;
  border: 1px solid rgba(255, 181, 71, 0.55);
  border-radius: 999px;
  color: var(--c-amber);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  vertical-align: 0.08em;
}
.page-disclaimer .usage-list {
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
}
.page-disclaimer .usage-list li {
  position: relative;
  padding-left: 1rem;
  color: var(--c-paper);
  font-size: 0.9375rem;
  line-height: 1.7;
}
.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 2px;
  background: var(--c-mint);
}
.page-disclaimer .usage-contact {
  margin: 0 0 1rem;
  padding: 0.9rem 1rem;
  list-style: none;
  display: grid;
  gap: 0.55rem;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-ink-2);
}
.page-disclaimer .usage-contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: baseline;
}
.page-disclaimer .usage-contact__k {
  min-width: 5.5em;
  color: var(--c-mist);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}
.page-disclaimer .usage-contact__v {
  color: var(--c-paper);
  font-size: 0.9375rem;
  word-break: break-all;
}

/* 页尾相关入口 */
.page-disclaimer .usage-foot {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-line);
}
.page-disclaimer .usage-foot__title {
  margin: 0 0 1rem;
  color: var(--c-paper);
}
.page-disclaimer .usage-foot__grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}
.page-disclaimer .usage-foot__card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem 1.125rem;
  text-decoration: none;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-ink-2);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}
.page-disclaimer .usage-foot__card:hover,
.page-disclaimer .usage-foot__card:focus-visible {
  border-color: var(--c-mint);
  transform: translateY(-2px);
}
.page-disclaimer .usage-foot__legal {
  margin: 1.5rem 0 0;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

/* 桌面布局 */
@media (min-width: 900px) {
  .page-disclaimer .usage-layout {
    display: grid;
    grid-template-columns: var(--usage-toc-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }
  .page-disclaimer .usage-toc {
    position: sticky;
    top: calc(var(--yb-header-h) + 1.5rem);
    margin-bottom: 0;
    padding-bottom: 1rem;
  }
  .page-disclaimer .usage-toc__list {
    flex-direction: column;
    overflow-x: visible;
    gap: 0.25rem;
    padding-bottom: 0;
  }
  .page-disclaimer .usage-toc__link {
    width: 100%;
    padding: 0.5rem 0.25rem;
    border: 0;
    border-bottom: 1px solid rgba(27, 43, 68, 0.8);
    border-radius: 0;
    background: none;
    font-size: 0.9375rem;
  }
  .page-disclaimer .usage-toc__link:hover,
  .page-disclaimer .usage-toc__link:focus-visible {
    border-bottom-color: var(--c-mint);
    background: none;
  }
  .page-disclaimer .usage-foot__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-disclaimer .usage-clause {
    padding-left: 1.5rem;
  }
}

@media (min-width: 1180px) {
  .page-disclaimer {
    --usage-toc-w: 244px;
  }
  .page-disclaimer .usage-foot__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-toc__link,
  .page-disclaimer .usage-clause,
  .page-disclaimer .usage-foot__card,
  .page-disclaimer .usage-top {
    transition: none;
  }
  .page-disclaimer .usage-foot__card:hover,
  .page-disclaimer .usage-foot__card:focus-visible {
    transform: none;
  }
}
<<<END>>>