.page-disclaimer {
  --usage-line: rgba(107, 114, 105, .30);
  --usage-tint: rgba(62, 155, 87, .07);
  --usage-tint-cool: rgba(143, 185, 199, .15);
  padding-bottom: clamp(56px, 9vw, 130px);
}

.page-disclaimer a:focus-visible,
.page-disclaimer summary:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(14px, 3vw, 30px);
  padding-bottom: clamp(26px, 5vw, 48px);
  border-bottom: 1px solid var(--usage-line);
}

.page-disclaimer .usage-hero__text {
  max-width: 44em;
}

.page-disclaimer .usage-hero .kicker {
  display: block;
  margin-bottom: 14px;
}

.page-disclaimer .usage-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.6vw, 3.2rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--c-moss);
}

.page-disclaimer .usage-hero .lede {
  margin-top: 16px;
  max-width: 38em;
}

.page-disclaimer .usage-hero__media {
  margin: 0;
  border: 1px solid var(--usage-line);
  border-radius: var(--r-lg);
  background: var(--usage-tint-cool);
  overflow: hidden;
}

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

.page-disclaimer .usage-hero__cap {
  padding: 12px 16px 14px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  line-height: 1.65;
  color: var(--c-stone);
}

/* ---------- 索引台骨架 ---------- */
.page-disclaimer .usage-desk {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(28px, 5vw, 52px);
}

/* ---------- 左目录 ---------- */
.page-disclaimer .usage-toc {
  align-self: start;
}

.page-disclaimer .usage-toc__caption {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--usage-line);
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--c-stone);
}

.page-disclaimer .usage-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-disclaimer .usage-toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px 8px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--c-ink);
  font-size: .9rem;
  line-height: 1.5;
  text-decoration: none;
  transition: background .18s ease, border-color .18s ease, color .18s ease;
}

.page-disclaimer .usage-toc__link:hover,
.page-disclaimer .usage-toc__link:focus-visible {
  background: var(--usage-tint);
  border-left-color: var(--c-pulp);
  color: var(--c-moss);
}

.page-disclaimer .usage-toc__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--c-terrace);
}

/* ---------- 右侧条目 ---------- */
.page-disclaimer .usage-entries {
  min-width: 0;
}

.page-disclaimer .usage-entry + .usage-entry {
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--usage-line);
}

.page-disclaimer .usage-fold__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 2px 0;
  cursor: pointer;
  list-style: none;
}

.page-disclaimer .usage-fold__head::-webkit-details-marker {
  display: none;
}

.page-disclaimer .usage-fold__num {
  flex: none;
  width: 26px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--c-peel);
}

.page-disclaimer .usage-fold__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--c-moss);
  transition: color .18s ease;
}

.page-disclaimer .usage-fold__head:hover .usage-fold__title {
  color: var(--c-pulp);
}

.page-disclaimer .usage-fold__mark {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-left: auto;
  align-self: center;
}

.page-disclaimer .usage-fold__mark::before,
.page-disclaimer .usage-fold__mark::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-terrace);
  transform: translateY(-50%);
}

.page-disclaimer .usage-fold__mark::after {
  transition: transform .2s ease;
  transform: translateY(-50%) rotate(90deg);
}

.page-disclaimer .usage-fold[open] .usage-fold__mark::after {
  transform: translateY(-50%) rotate(0deg);
}

.page-disclaimer .usage-fold__body {
  padding-top: 14px;
}

.page-disclaimer .usage-fold__body > p {
  margin: 0;
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--c-ink);
}

.page-disclaimer .usage-fold__body a {
  color: var(--c-terrace);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-disclaimer .usage-fold__body a:hover {
  color: var(--c-moss);
}

/* ---------- 要点列表：圆角短横线 ---------- */
.page-disclaimer .usage-points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  max-width: 42em;
}

.page-disclaimer .usage-points li {
  position: relative;
  padding-left: 26px;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--c-ink);
}

.page-disclaimer .usage-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 14px;
  height: 3px;
  border-radius: 2px;
  background: var(--c-pulp);
}

/* ---------- 版本对照表 ---------- */
.page-disclaimer .usage-table-wrap {
  margin-top: 22px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.page-disclaimer .usage-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: .88rem;
  line-height: 1.6;
}

.page-disclaimer .usage-table caption {
  caption-side: top;
  text-align: left;
  padding: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--c-stone);
}

.page-disclaimer .usage-table thead th {
  padding: 11px 14px;
  text-align: left;
  white-space: nowrap;
  background: var(--c-moss);
  color: var(--c-ivory);
  font-family: var(--font-display);
  font-size: .85rem;
  font-weight: 700;
}

.page-disclaimer .usage-table thead th:first-child {
  border-radius: var(--r-sm) 0 0 0;
}

.page-disclaimer .usage-table thead th:last-child {
  border-radius: 0 var(--r-sm) 0 0;
}

.page-disclaimer .usage-table td {
  padding: 12px 14px;
  vertical-align: top;
  border-bottom: 1px solid var(--usage-line);
  color: var(--c-ink);
}

.page-disclaimer .usage-table tbody tr:last-child td {
  border-bottom: none;
}

.page-disclaimer .usage-table .ver {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--c-peel);
  white-space: nowrap;
}

.page-disclaimer .usage-table tbody tr.usage-row--current {
  background: var(--c-wash);
  box-shadow: inset 3px 0 0 var(--c-pulp);
}

.page-disclaimer .usage-table tbody tr.usage-row--archived {
  background: var(--c-surface-2);
  box-shadow: inset 3px 0 0 var(--c-peel);
}

.page-disclaimer .usage-table tbody tr.usage-row--archived .ver {
  color: var(--c-stone);
}

/* ---------- 收尾 ---------- */
.page-disclaimer .usage-tail {
  margin-top: clamp(46px, 7vw, 88px);
}

.page-disclaimer .usage-tail::before {
  content: "";
  display: block;
  height: 44px;
  margin-bottom: clamp(22px, 4vw, 34px);
  border-radius: var(--r-sm);
  background-image:
    repeating-linear-gradient(115deg, rgba(122, 74, 40, .11) 0 8px, rgba(122, 74, 40, 0) 8px 22px),
    repeating-linear-gradient(90deg, rgba(47, 108, 133, .08) 0 2px, rgba(47, 108, 133, 0) 2px 18px);
}

.page-disclaimer .usage-tail__lead {
  margin: 0 0 18px;
  max-width: 34em;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--c-moss);
}

.page-disclaimer .usage-tail__action {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 520px) and (max-width: 959px) {
  .page-disclaimer .usage-toc__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 10px;
  }
}

@media (min-width: 640px) {
  .page-disclaimer .usage-fold__body {
    padding-left: 38px;
  }
}

@media (min-width: 880px) {
  .page-disclaimer .usage-hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, min(420px, 38%));
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-disclaimer .usage-desk {
    grid-template-columns: minmax(172px, 212px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-disclaimer .usage-toc {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-fold__mark::after,
  .page-disclaimer .usage-toc__link,
  .page-disclaimer .usage-fold__title {
    transition: none;
  }
}