.page-disclaimer {
  --u-col: minmax(0, 1fr);
  --u-radius: 2px;
  --u-tint: rgba(14, 79, 107, 0.18);
}

/* ---------- 页头 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line-soft);
}

.page-disclaimer .usage-hero__img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  filter: saturate(0.75);
}

.page-disclaimer .usage-hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(6, 26, 19, 0.5) 0%, rgba(6, 26, 19, 0.94) 82%, var(--ink-950) 100%),
    repeating-linear-gradient(90deg, rgba(111, 143, 130, 0.13) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(111, 143, 130, 0.09) 0 1px, transparent 1px 72px);
}

.page-disclaimer .usage-hero__inner {
  position: relative;
  padding-block: clamp(40px, 6vw, 76px) clamp(32px, 5vw, 60px);
}

.page-disclaimer .breadcrumbs {
  margin-bottom: 24px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-disclaimer .usage-hero .eyebrow {
  color: var(--cyan);
  margin-bottom: 14px;
}

.page-disclaimer .usage-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.4vw, 62px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-disclaimer .usage-hero__lead {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 场景索引 ---------- */
.page-disclaimer .usage-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(26px, 3.5vw, 38px);
}

.page-disclaimer .usage-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line-soft);
  border-radius: var(--u-radius);
  background: rgba(18, 61, 46, 0.42);
  color: var(--paper);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease), color 180ms var(--ease);
}

.page-disclaimer .usage-index a .mono {
  font-size: 11px;
  color: var(--cyan);
}

.page-disclaimer .usage-index a:hover,
.page-disclaimer .usage-index a:focus-visible {
  border-color: var(--cyan);
  background: rgba(27, 90, 69, 0.62);
  color: var(--paper);
}

.page-disclaimer .usage-index a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 布局 ---------- */
.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: var(--u-col);
  gap: clamp(32px, 5vw, 68px);
  padding-block: clamp(44px, 6vw, 84px) clamp(56px, 7vw, 96px);
}

.page-disclaimer .usage-body {
  max-width: 760px;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-disclaimer .usage-chapter {
  padding-block: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--line-faint);
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-disclaimer .usage-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-disclaimer .usage-chapter:target {
  border-top-color: rgba(53, 240, 208, 0.55);
}

.page-disclaimer .usage-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-disclaimer .usage-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.4vw, 22px);
  line-height: 1.35;
  color: var(--cyan);
  opacity: 0.85;
}

.page-disclaimer .usage-chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.006em;
  color: var(--paper);
}

.page-disclaimer .usage-chapter__link {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--line);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

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

.page-disclaimer .usage-chapter p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}

.page-disclaimer .usage-chapter p:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-chapter p a,
.page-disclaimer .usage-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, 0.4);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-disclaimer .usage-chapter p a:hover,
.page-disclaimer .usage-note a:hover,
.page-disclaimer .usage-chapter p a:focus-visible,
.page-disclaimer .usage-note a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.page-disclaimer .usage-note {
  margin-top: 16px;
  padding: 12px 14px;
  border-left: 2px solid var(--line-soft);
  background: rgba(18, 61, 46, 0.34);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 列表 ---------- */
.page-disclaimer .usage-list {
  margin: 16px 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .usage-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-disclaimer .usage-list li:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--cyan);
  opacity: 0.8;
}

.page-disclaimer .usage-list li strong {
  color: var(--paper);
  font-weight: 600;
}

.page-disclaimer .usage-ol {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: usage-step;
}

.page-disclaimer .usage-ol li {
  counter-increment: usage-step;
  position: relative;
  padding: 14px 0 14px 44px;
  border-top: 1px solid var(--line-faint);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-disclaimer .usage-ol li::before {
  content: counter(usage-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
}

.page-disclaimer .usage-ol li a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, 0.4);
}

.page-disclaimer .usage-ol li a:hover {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

/* ---------- 对照表 ---------- */
.page-disclaimer .usage-diff {
  margin: 20px 0 8px;
  border: 1px solid var(--line-soft);
  border-radius: var(--u-radius);
  background:
    linear-gradient(180deg, var(--u-tint), rgba(6, 26, 19, 0.35)),
    var(--ink-900);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-disclaimer .usage-diff__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 15px 16px;
  border-top: 1px solid var(--line-faint);
}

.page-disclaimer .usage-diff__row--head {
  border-top: 0;
  background: rgba(6, 26, 19, 0.5);
}

.page-disclaimer .usage-diff__row--head .usage-diff__cell {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-disclaimer .usage-diff__cell {
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-disclaimer .usage-diff__cell:first-child {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-disclaimer .usage-diff__cell[data-k]::before {
  content: attr(data-k);
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--line);
}

/* ---------- 联系信息 ---------- */
.page-disclaimer .usage-contact {
  margin: 18px 0 6px;
  border: 1px solid var(--line-soft);
  border-radius: var(--u-radius);
  background: rgba(18, 61, 46, 0.38);
  box-shadow: var(--shadow-panel);
}

.page-disclaimer .usage-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 16px;
  border-top: 1px solid var(--line-faint);
}

.page-disclaimer .usage-contact__row:first-child {
  border-top: 0;
}

.page-disclaimer .usage-contact__key {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-disclaimer .usage-contact__val {
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
  overflow-wrap: anywhere;
}

/* ---------- 侧边目录 ---------- */
.page-disclaimer .usage-toc {
  display: none;
}

/* ---------- 中等屏幕：对照表三列 ---------- */
@media (min-width: 720px) {
  .page-disclaimer .usage-diff__row {
    grid-template-columns: minmax(110px, 0.75fr) minmax(0, 1.15fr) minmax(0, 1.15fr);
    gap: 16px;
    padding: 15px 18px;
    align-items: start;
  }

  .page-disclaimer .usage-diff__cell[data-k]::before {
    display: none;
  }

  .page-disclaimer .usage-contact__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

/* ---------- 宽屏：正文 + 粘性目录 ---------- */
@media (min-width: 1000px) {
  .page-disclaimer .usage-layout {
    grid-template-columns: minmax(0, 1fr) 236px;
    align-items: start;
  }

  .page-disclaimer .usage-toc {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    padding-left: 18px;
    border-left: 1px solid var(--line-soft);
  }

  .page-disclaimer .usage-toc__title {
    margin: 0 0 14px;
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--line);
  }

  .page-disclaimer .usage-toc__list {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .page-disclaimer .usage-toc__list li {
    margin-bottom: 2px;
  }

  .page-disclaimer .usage-toc__list a {
    display: flex;
    align-items: baseline;
    gap: 9px;
    padding: 6px 0;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--muted);
    text-decoration: none;
    transition: color 160ms var(--ease), transform 160ms var(--ease);
  }

  .page-disclaimer .usage-toc__list a .mono {
    font-size: 10.5px;
    color: var(--line);
    transition: color 160ms var(--ease);
  }

  .page-disclaimer .usage-toc__list a:hover,
  .page-disclaimer .usage-toc__list a:focus-visible {
    color: var(--paper);
    transform: translateX(3px);
  }

  .page-disclaimer .usage-toc__list a:hover .mono,
  .page-disclaimer .usage-toc__list a:focus-visible .mono {
    color: var(--cyan);
  }

  .page-disclaimer .usage-toc__list a:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 2px;
  }

  .page-disclaimer .usage-toc__back {
    display: inline-block;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--line-faint);
    font-size: 12.5px;
    color: var(--orange);
    text-decoration: none;
  }

  .page-disclaimer .usage-toc__back:hover,
  .page-disclaimer .usage-toc__back:focus-visible {
    color: var(--paper);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-index a,
  .page-disclaimer .usage-chapter__link,
  .page-disclaimer .usage-toc__list a {
    transition: none;
  }

  .page-disclaimer .usage-toc__list a:hover {
    transform: none;
  }
}

.page-disclaimer {
  --u-col: minmax(0, 1fr);
  --u-radius: 2px;
  --u-tint: rgba(14, 79, 107, 0.18);
}

/* ---------- 页头 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line-soft);
}

.page-disclaimer .usage-hero__img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  filter: saturate(0.75);
}

.page-disclaimer .usage-hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(6, 26, 19, 0.5) 0%, rgba(6, 26, 19, 0.94) 82%, var(--ink-950) 100%),
    repeating-linear-gradient(90deg, rgba(111, 143, 130, 0.13) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(111, 143, 130, 0.09) 0 1px, transparent 1px 72px);
}

.page-disclaimer .usage-hero__inner {
  position: relative;
  padding-block: clamp(40px, 6vw, 76px) clamp(32px, 5vw, 60px);
}

.page-disclaimer .breadcrumbs {
  margin-bottom: 24px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-disclaimer .usage-hero .eyebrow {
  margin-bottom: 14px;
  color: var(--cyan);
}

.page-disclaimer .usage-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.4vw, 62px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-disclaimer .usage-hero__lead {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 场景索引 ---------- */
.page-disclaimer .usage-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(26px, 3.5vw, 38px);
}

.page-disclaimer .usage-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line-soft);
  border-radius: var(--u-radius);
  background: rgba(18, 61, 46, 0.42);
  color: var(--paper);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease), color 180ms var(--ease);
}

.page-disclaimer .usage-index a .mono {
  font-size: 11px;
  color: var(--cyan);
}

.page-disclaimer .usage-index a:hover,
.page-disclaimer .usage-index a:focus-visible {
  border-color: var(--cyan);
  background: rgba(27, 90, 69, 0.62);
  color: var(--paper);
}

.page-disclaimer .usage-index a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 布局 ---------- */
.page-disclaimer .usage-layout {
  display: grid;
  grid-template-columns: var(--u-col);
  gap: clamp(32px, 5vw, 68px);
  padding-block: clamp(44px, 6vw, 84px) clamp(56px, 7vw, 96px);
}

.page-disclaimer .usage-body {
  min-width: 0;
  max-width: 760px;
}

/* ---------- 章节 ---------- */
.page-disclaimer .usage-chapter {
  padding-block: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--line-faint);
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-disclaimer .usage-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-disclaimer .usage-chapter:target {
  border-top-color: rgba(53, 240, 208, 0.55);
}

.page-disclaimer .usage-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  margin-bottom: 18px;
}

.page-disclaimer .usage-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.4vw, 22px);
  line-height: 1.35;
  color: var(--cyan);
  opacity: 0.85;
}

.page-disclaimer .usage-chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.006em;
  color: var(--paper);
}

.page-disclaimer .usage-chapter__link {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--line);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

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

.page-disclaimer .usage-chapter p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}

.page-disclaimer .usage-chapter p:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-chapter p a,
.page-disclaimer .usage-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, 0.4);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-disclaimer .usage-chapter p a:hover,
.page-disclaimer .usage-note a:hover,
.page-disclaimer .usage-chapter p a:focus-visible,
.page-disclaimer .usage-note a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.page-disclaimer .usage-note {
  margin-top: 16px;
  padding: 12px 14px;
  border-left: 2px solid var(--line-soft);
  background: rgba(18, 61, 46, 0.34);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 列表 ---------- */
.page-disclaimer .usage-list {
  margin: 16px 0;
  padding: 0;
  list-style: none;
}

.page-disclaimer .usage-list li {
  position: relative;
  margin-bottom: 12px;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-disclaimer .usage-list li:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--cyan);
  opacity: 0.8;
}

.page-disclaimer .usage-list li strong {
  color: var(--paper);
  font-weight: 600;
}

.page-disclaimer .usage-ol {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: usage-step;
}

.page-disclaimer .usage-ol li {
  counter-increment: usage-step;
  position: relative;
  padding: 14px 0 14px 44px;
  border-top: 1px solid var(--line-faint);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-disclaimer .usage-ol li::before {
  content: counter(usage-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
}

.page-disclaimer .usage-ol li a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, 0.4);
}

.page-disclaimer .usage-ol li a:hover,
.page-disclaimer .usage-ol li a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

/* ---------- 对照表 ---------- */
.page-disclaimer .usage-diff {
  margin: 20px 0 8px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--u-radius);
  background:
    linear-gradient(180deg, var(--u-tint), rgba(6, 26, 19, 0.35)),
    var(--ink-900);
  box-shadow: var(--shadow-panel);
}

.page-disclaimer .usage-diff__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 15px 16px;
  border-top: 1px solid var(--line-faint);
}

.page-disclaimer .usage-diff__row--head {
  border-top: 0;
  background: rgba(6, 26, 19, 0.5);
}

.page-disclaimer .usage-diff__row--head .usage-diff__cell {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-disclaimer .usage-diff__cell {
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-disclaimer .usage-diff__cell:first-child {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-disclaimer .usage-diff__cell[data-k]::before {
  content: attr(data-k);
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--line);
}

/* ---------- 联系信息 ---------- */
.page-disclaimer .usage-contact {
  margin: 18px 0 6px;
  border: 1px solid var(--line-soft);
  border-radius: var(--u-radius);
  background: rgba(18, 61, 46, 0.38);
  box-shadow: var(--shadow-panel);
}

.page-disclaimer .usage-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 16px;
  border-top: 1px solid var(--line-faint);
}

.page-disclaimer .usage-contact__row:first-child {
  border-top: 0;
}

.page-disclaimer .usage-contact__key {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-disclaimer .usage-contact__val {
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
  overflow-wrap: anywhere;
}

/* ---------- 侧边目录（窄屏收起） ---------- */
.page-disclaimer .usage-toc {
  display: none;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-disclaimer .usage-diff__row {
    grid-template-columns: minmax(104px, 0.72fr) minmax(0, 1.15fr) minmax(0, 1.15fr);
    gap: 16px;
    padding: 15px 18px;
    align-items: start;
  }

  .page-disclaimer .usage-diff__cell[data-k]::before {
    display: none;
  }

  .page-disclaimer .usage-contact__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

/* ---------- 宽屏：正文 + 粘性目录 ---------- */
@media (min-width: 1000px) {
  .page-disclaimer .usage-layout {
    grid-template-columns: minmax(0, 1fr) 236px;
    align-items: start;
  }

  .page-disclaimer .usage-toc {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    padding-left: 18px;
    border-left: 1px solid var(--line-soft);
  }

  .page-disclaimer .usage-toc__title {
    margin: 0 0 14px;
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--line);
  }

  .page-disclaimer .usage-toc__list {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .page-disclaimer .usage-toc__list li {
    margin-bottom: 2px;
  }

  .page-disclaimer .usage-toc__list a {
    display: flex;
    align-items: baseline;
    gap: 9px;
    padding: 6px 0;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--muted);
    text-decoration: none;
    transition: color 160ms var(--ease), transform 160ms var(--ease);
  }

  .page-disclaimer .usage-toc__list a .mono {
    font-size: 10.5px;
    color: var(--line);
    transition: color 160ms var(--ease);
  }

  .page-disclaimer .usage-toc__list a:hover,
  .page-disclaimer .usage-toc__list a:focus-visible {
    color: var(--paper);
    transform: translateX(3px);
  }

  .page-disclaimer .usage-toc__list a:hover .mono,
  .page-disclaimer .usage-toc__list a:focus-visible .mono {
    color: var(--cyan);
  }

  .page-disclaimer .usage-toc__list a:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 2px;
  }

  .page-disclaimer .usage-toc__back {
    display: inline-block;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--line-faint);
    font-size: 12.5px;
    color: var(--orange);
    text-decoration: none;
  }

  .page-disclaimer .usage-toc__back:hover,
  .page-disclaimer .usage-toc__back:focus-visible {
    color: var(--paper);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-index a,
  .page-disclaimer .usage-chapter__link,
  .page-disclaimer .usage-toc__list a {
    transition: none;
  }

  .page-disclaimer .usage-toc__list a:hover {
    transform: none;
  }
}