.page-disclaimer{
  --pd-rail:56px;
  --pd-aside:268px;
  position:relative;
  color:var(--c-text);
  font-family:var(--font-body);
  background-color:var(--c-void);
  background-image:
    radial-gradient(760px 420px at 88% -6%, rgba(122,77,255,.22), transparent 64%),
    radial-gradient(680px 380px at 4% 2%, rgba(43,245,216,.10), transparent 68%),
    linear-gradient(rgba(36,48,74,.30) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36,48,74,.30) 1px, transparent 1px);
  background-size:auto, auto, 120px 120px, 120px 120px;
  background-repeat:no-repeat, no-repeat, repeat, repeat;
  overflow-x:clip;
  padding-bottom:8px;
}
.page-disclaimer *{
  box-sizing:border-box;
}
.page-disclaimer a:focus-visible,
.page-disclaimer .term-item:focus-visible{
  outline:2px solid var(--c-cyan);
  outline-offset:3px;
}

/* 面包屑与首屏 */
.page-disclaimer .breadcrumb{
  padding-top:26px;
}
.usage-hero{
  padding:36px 0 40px;
  max-width:1000px;
}
.usage-hero h1{
  margin:14px 0 0;
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(30px, 5.2vw, 54px);
  line-height:1.16;
  letter-spacing:.01em;
  color:var(--c-text);
  text-shadow:0 0 24px rgba(43,245,216,.20);
}
.usage-lead{
  margin:18px 0 0;
  max-width:64ch;
  font-size:17px;
  line-height:1.78;
  color:var(--c-muted);
}
.usage-jump{
  display:flex;
  flex-wrap:wrap;
  gap:8px 10px;
  margin:26px 0 0;
  padding:0;
  list-style:none;
}
.usage-jump a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 12px;
  border:1px solid var(--c-line);
  border-radius:2px;
  font-size:13px;
  line-height:1.4;
  color:var(--c-muted);
  text-decoration:none;
  transition:color .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease), transform .2s var(--ease);
}
.usage-jump a .mono{
  color:var(--c-cyan);
  font-size:11px;
  letter-spacing:.08em;
}
.usage-jump a:hover{
  color:var(--c-text);
  border-color:rgba(43,245,216,.55);
  box-shadow:var(--glow-cyan);
  transform:translateY(-2px);
}

/* 页头横幅 */
.usage-banner{
  margin:0 0 8px;
  border-radius:3px;
}
.page-disclaimer .usage-banner img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-disclaimer .usage-banner .media-caption{
  padding:10px 2px 0;
  font-size:13px;
  line-height:1.6;
  color:var(--c-muted);
}

/* 主体两栏 */
.usage-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:36px;
  padding-top:52px;
}

/* 条款区 */
.clause-section{
  display:grid;
  grid-template-columns:36px minmax(0,1fr);
  gap:12px;
  padding:30px 0 6px;
  border-top:1px solid var(--c-line);
}
.clause-section:first-child{
  border-top-color:rgba(43,245,216,.42);
}
.clause-rail{
  position:relative;
}
.clause-rail::before{
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  left:6px;
  width:1px;
  background:linear-gradient(180deg, rgba(43,245,216,.45), rgba(36,48,74,.15));
}
.clause-index{
  position:sticky;
  top:112px;
  display:inline-block;
  padding-left:16px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--c-cyan);
}
.clause-title{
  margin:0 0 10px;
  font-family:var(--font-head);
  font-weight:700;
  font-size:21px;
  line-height:1.35;
  letter-spacing:.01em;
  color:var(--c-text);
}
.clause-list{
  margin:0;
  padding:0;
  list-style:none;
}
.clause-item{
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  gap:8px;
  padding:14px 0;
  border-bottom:1px solid var(--c-line);
}
.clause-item:first-child{
  padding-top:4px;
}
.clause-no{
  padding-top:4px;
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--c-muted);
}
.clause-text{
  margin:0;
  font-size:15.5px;
  line-height:1.72;
  color:var(--c-text);
}
.clause-text::selection{
  background:rgba(43,245,216,.3);
}

/* 术语小注 */
.usage-terms{
  padding:20px 18px 18px;
  border:1px solid var(--c-line);
  border-radius:3px;
  background:linear-gradient(180deg, rgba(22,35,58,.62), rgba(14,20,32,.32));
  box-shadow:var(--shadow-panel);
}
.terms-title{
  margin:0 0 14px;
  font-size:11.5px;
  letter-spacing:.18em;
  color:var(--c-muted);
}
.terms-list{
  margin:0;
  padding:0;
  list-style:none;
}
.term-item{
  padding:10px 0;
  border-bottom:1px solid rgba(36,48,74,.85);
  cursor:help;
}
.term-item:last-child{
  border-bottom:0;
}
.term-name{
  position:relative;
  display:block;
  padding-left:15px;
  font-size:14px;
  line-height:1.5;
  color:var(--c-text);
}
.term-name::before{
  content:"";
  position:absolute;
  left:0;
  top:7px;
  width:6px;
  height:6px;
  border:1px solid var(--c-cyan);
  transform:rotate(45deg);
}
.term-body{
  display:block;
  max-height:0;
  margin-top:0;
  overflow:hidden;
  opacity:0;
  font-size:13px;
  line-height:1.68;
  color:var(--c-muted);
  transition:max-height .32s var(--ease), opacity .32s var(--ease), margin-top .32s var(--ease);
}
.term-item:hover .term-body,
.term-item:focus-within .term-body,
.term-item:focus-visible .term-body{
  max-height:160px;
  margin-top:8px;
  opacity:1;
}
.terms-footnote{
  margin:16px 0 0;
  padding-top:14px;
  border-top:1px solid var(--c-line);
  font-size:12.5px;
  line-height:1.68;
  color:var(--c-muted);
}

/* 扫描线收束与延伸入口 */
.usage-scan{
  height:20px;
  margin-top:56px;
  background-image:
    repeating-linear-gradient(90deg, rgba(43,245,216,.6) 0 1px, transparent 1px 9px),
    linear-gradient(90deg, rgba(122,77,255,.55), rgba(43,245,216,.2));
  background-size:auto, 100% 1px;
  background-position:0 0, 0 100%;
  background-repeat:repeat, no-repeat;
  opacity:.55;
  -webkit-mask-image:linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image:linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.usage-next{
  padding:30px 0 72px;
}
.next-title{
  margin:0 0 16px;
  font-size:11.5px;
  letter-spacing:.18em;
  color:var(--c-muted);
}
.next-list{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:1px;
  margin:0;
  padding:0;
  list-style:none;
  background:var(--c-line);
  border:1px solid var(--c-line);
  border-radius:3px;
  overflow:hidden;
}
.next-item{
  display:block;
  padding:18px 16px;
  background:var(--c-graphite);
  transition:background .2s var(--ease), box-shadow .2s var(--ease);
}
.next-item:hover{
  background:var(--c-indigo);
  box-shadow:inset 0 0 0 1px rgba(43,245,216,.45);
}
.next-link{
  display:block;
  font-family:var(--font-head);
  font-weight:700;
  font-size:16px;
  color:var(--c-text);
  text-decoration:none;
}
.next-link:hover{
  color:var(--c-cyan);
}
.next-text{
  display:block;
  margin-top:6px;
  font-size:13.5px;
  line-height:1.65;
  color:var(--c-muted);
}

/* 平板与桌面 */
@media (min-width:620px){
  .usage-jump a{
    padding:8px 14px;
  }
  .next-list{
    grid-template-columns:repeat(3, minmax(0,1fr));
  }
}

@media (min-width:960px){
  .usage-layout{
    grid-template-columns:minmax(0,1fr) var(--pd-aside);
    gap:56px;
    padding-top:64px;
  }
  .clause-section{
    grid-template-columns:var(--pd-rail) minmax(0,1fr);
    gap:20px;
    padding-top:34px;
  }
  .clause-item{
    grid-template-columns:52px minmax(0,1fr);
    gap:14px;
  }
  .usage-terms{
    position:sticky;
    top:118px;
    padding:22px 20px 20px;
  }
  .usage-scan{
    margin-top:72px;
  }
}

@media (prefers-reduced-motion:reduce){
  .page-disclaimer .usage-jump a,
  .page-disclaimer .term-body,
  .page-disclaimer .next-item{
    transition:none;
  }
  .page-disclaimer .usage-jump a:hover{
    transform:none;
  }
}