.page-disclaimer {
  --dsk-rule: rgba(143,166,200,.26);
  position: relative;
  display: block;
  background:
    linear-gradient(180deg, rgba(10,108,255,.12), rgba(6,16,36,0) 460px),
    var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-disclaimer .usage-crumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  padding: 22px 0 0;
}

.page-disclaimer .usage-hero__inner {
  display: grid;
  gap: 24px;
  padding-bottom: 26px;
}

.page-disclaimer .usage-hero__copy .kicker {
  color: var(--cyan);
  margin: 0;
}

.page-disclaimer .usage-hero__copy h1 {
  margin: 12px 0 0;
  font-size: clamp(32px, 5vw, 62px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 20em;
}

.page-disclaimer .usage-hero__copy .lead {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ice);
}

.page-disclaimer .usage-hero__meta {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-disclaimer .usage-hero__metarow {
  background: var(--ink-2);
  padding: 14px 16px;
}

.page-disclaimer .usage-hero__metarow dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-disclaimer .usage-hero__metarow dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-disclaimer .usage-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--teal), var(--ink-2) 78%);
}

.page-disclaimer .usage-hero__figure .figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 7;
}

.page-disclaimer .usage-hero__figure .figure__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ice);
}

/* ---------- 章节索引 ---------- */
.page-disclaimer .usage-toc {
  margin-top: 34px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.03);
}

.page-disclaimer .usage-toc__inner {
  display: grid;
  gap: 12px;
  padding: 18px 0;
}

.page-disclaimer .usage-toc__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-disclaimer .usage-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-disclaimer .usage-toc__list a {
  position: relative;
  display: inline-block;
  padding-bottom: 3px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--paper);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-disclaimer .usage-toc__list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}

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

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

/* ---------- 斜切分隔条 ---------- */
.page-disclaimer .usage-cut {
  height: 10px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--cyan) 42%, rgba(0,229,195,0) 100%);
  clip-path: polygon(0 70%, 100% 0, 100% 100%, 0 100%);
  opacity: .75;
}

/* ---------- 章节 ---------- */
.page-disclaimer .usage-sec {
  padding: clamp(44px, 6vw, 88px) 0;
}

.page-disclaimer .usage-sec--last {
  padding-bottom: clamp(36px, 4vw, 60px);
}

.page-disclaimer .usage-sec__inner {
  display: grid;
  gap: 22px;
}

.page-disclaimer .usage-sec__index {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-disclaimer .usage-sec__title {
  margin: 0 0 14px;
  font-size: clamp(25px, 2.8vw, 36px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-disclaimer .usage-sec__lede {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--paper);
}

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

.page-disclaimer .usage-sec__body .prose p {
  margin: 0 0 1.2em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ice);
}

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

/* ---------- 窄栏摘要块 ---------- */
.page-disclaimer .usage-brief {
  background: var(--glass);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  padding: 16px 18px 18px;
}

.page-disclaimer .usage-brief__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-disclaimer .usage-brief__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ice);
}

/* ---------- 规则条目列表 ---------- */
.page-disclaimer .usage-list {
  margin: 0 0 1.4em;
  padding: 0;
  list-style: none;
  display: grid;
}

.page-disclaimer .usage-list > li {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ice);
}

.page-disclaimer .usage-list > li::before {
  content: "";
  width: 16px;
  height: 2px;
  margin-top: 12px;
  background: var(--cyan);
}

.page-disclaimer .usage-list > li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-list strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 折叠条目 ---------- */
.page-disclaimer .usage-folds {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-folds .fold {
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  padding-left: 14px;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-disclaimer .usage-folds .fold:hover {
  border-left-color: var(--blue);
  background: rgba(255,255,255,.03);
}

.page-disclaimer .usage-folds .fold[open] {
  border-left-color: var(--cyan);
}

.page-disclaimer .usage-folds .fold__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

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

.page-disclaimer .usage-folds .fold__summary::before {
  content: "+";
  flex: 0 0 18px;
  width: 18px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--blue);
  transition: color .18s var(--ease);
}

.page-disclaimer .usage-folds .fold[open] .fold__summary::before {
  content: "−";
  color: var(--cyan);
}

.page-disclaimer .usage-folds .fold__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-disclaimer .usage-folds .fold__body {
  padding: 0 0 18px 30px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
}

.page-disclaimer .usage-folds .fold__body p {
  margin: 0 0 .9em;
}

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

/* ---------- 章节动作 ---------- */
.page-disclaimer .usage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 页尾横向滑动条 ---------- */
.page-disclaimer .usage-more {
  padding: clamp(46px, 6vw, 84px) 0 clamp(46px, 5vw, 72px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(4,50,74,.6), rgba(6,16,36,0) 72%);
}

.page-disclaimer .usage-more__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 22px;
}

.page-disclaimer .usage-more__title {
  margin: 0;
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-disclaimer .usage-more__hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-disclaimer .usage-more__strip {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--blue) transparent;
}

.page-disclaimer .usage-more__strip::-webkit-scrollbar {
  height: 6px;
}

.page-disclaimer .usage-more__strip::-webkit-scrollbar-track {
  background: rgba(143,166,200,.16);
}

.page-disclaimer .usage-more__strip::-webkit-scrollbar-thumb {
  background: var(--blue);
  border-radius: 999px;
}

.page-disclaimer .usage-more__item {
  flex: 0 0 auto;
  width: min(78vw, 268px);
  scroll-snap-align: start;
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--paper);
  text-decoration: none;
  transition: border-color .18s var(--ease), background .18s var(--ease), transform .18s var(--ease);
}

.page-disclaimer .usage-more__item:hover,
.page-disclaimer .usage-more__item:focus-visible {
  border-color: var(--blue);
  background: var(--glass-strong);
  transform: translateY(-3px);
}

.page-disclaimer .usage-more__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-disclaimer .usage-more__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-disclaimer .usage-more__name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
}

.page-disclaimer .usage-more__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ice);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-disclaimer .usage-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-toc__inner {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 30px;
  }

  .page-disclaimer .usage-sec__inner {
    grid-template-columns: 72px minmax(0, 1fr) 272px;
    gap: 36px;
    align-items: start;
  }

  .page-disclaimer .usage-sec__index {
    padding-top: 8px;
  }

  .page-disclaimer .usage-brief {
    margin-top: 6px;
  }
}

@media (min-width: 1024px) {
  .page-disclaimer .usage-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 52px;
    align-items: end;
    padding-bottom: 40px;
  }

  .page-disclaimer .usage-hero__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-disclaimer .usage-sec__inner {
    grid-template-columns: 88px minmax(0, 1fr) 300px;
    gap: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-toc__list a,
  .page-disclaimer .usage-toc__list a::after,
  .page-disclaimer .usage-folds .fold,
  .page-disclaimer .usage-folds .fold__summary::before,
  .page-disclaimer .usage-more__item {
    transition: none;
  }

  .page-disclaimer .usage-more__item:hover,
  .page-disclaimer .usage-more__item:focus-visible {
    transform: none;
  }
}