.page-faq{
  --faq-line:rgba(100,127,149,.3);
  --faq-ink-soft:#3d5568;
  --faq-link:#0f6f77;
}

/* ---------- 首屏框景 ---------- */
.page-faq .kb-hero{
  position:relative;
  overflow:hidden;
  background:var(--kv-deep);
  color:var(--kv-paper);
  padding:clamp(18px,3vw,30px) 0 clamp(30px,5vw,62px);
}
.page-faq .kb-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(90deg,rgba(45,226,230,.07) 0 1px,transparent 1px 72px);
  pointer-events:none;
}
.page-faq .kb-hero__inner{
  position:relative;
  z-index:1;
}
.page-faq .kb-hero__frame{
  position:relative;
  border:1px solid rgba(221,231,238,.18);
  border-radius:var(--kv-radius-l);
  background:linear-gradient(158deg,rgba(18,58,86,.78),rgba(10,34,56,.28));
  padding:clamp(18px,3.2vw,38px);
}
.page-faq .kb-hero__frame::before{
  content:"";
  position:absolute;
  top:12px;
  left:clamp(18px,3.2vw,38px);
  right:clamp(18px,3.2vw,38px);
  height:7px;
  background-image:repeating-linear-gradient(90deg,rgba(45,226,230,.62) 0 1px,transparent 1px 14px);
  opacity:.6;
  pointer-events:none;
}
.page-faq .kb-hero__grid{
  display:grid;
  gap:clamp(20px,3.4vw,40px);
  align-items:center;
  margin-top:clamp(18px,3vw,30px);
}
.page-faq .kb-hero h1{
  margin:14px 0 0;
  font-family:var(--kv-serif);
  font-weight:600;
  font-size:clamp(27px,5vw,50px);
  line-height:1.24;
  letter-spacing:-.01em;
  color:#fff;
}
.page-faq .kb-hero__lede{
  margin:16px 0 0;
  max-width:58ch;
  font-size:clamp(15px,1.7vw,17px);
  line-height:1.86;
  color:rgba(247,250,252,.84);
}
.page-faq .kb-hero__jump{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:24px 0 0;
  padding:0;
  list-style:none;
}
.page-faq .kb-hero__jump a{
  display:inline-block;
  padding:9px 16px;
  border-radius:999px;
  border:1px solid rgba(45,226,230,.42);
  color:var(--kv-cyan);
  font-size:14px;
  text-decoration:none;
  transition:background .25s var(--kv-ease),border-color .25s var(--kv-ease);
}
.page-faq .kb-hero__jump a:hover,
.page-faq .kb-hero__jump a:focus-visible{
  background:rgba(45,226,230,.15);
  border-color:rgba(45,226,230,.8);
}
.page-faq .kb-hero__visual{
  border-radius:var(--kv-radius-m);
  overflow:hidden;
  border:1px solid rgba(221,231,238,.22);
  background:rgba(247,250,252,.05);
}
.page-faq .kb-hero__visual img{
  display:block;
  width:100%;
  height:auto;
  max-width:100%;
  object-fit:cover;
}

/* ---------- 主体双栏 ---------- */
.page-faq .kb-body{
  background:var(--kv-mist);
  padding:clamp(28px,4.6vw,62px) 0 clamp(38px,6vw,80px);
}
.page-faq .kb-layout{
  display:grid;
  gap:clamp(22px,3vw,44px);
  align-items:start;
}

/* 左侧索引 */
.page-faq .kb-rail{
  background:var(--kv-paper);
  border:1px solid var(--faq-line);
  border-radius:var(--kv-radius-l);
  padding:16px;
  box-shadow:var(--kv-shadow);
}
.page-faq .kb-rail__title{
  margin:0 0 12px;
  font-family:var(--kv-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--kv-steel);
}
.page-faq .kb-rail__nav{
  display:flex;
  gap:8px;
  overflow-x:auto;
  padding-bottom:4px;
  scrollbar-width:thin;
}
.page-faq .kb-rail__link{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:8px;
  padding:9px 14px;
  border-radius:999px;
  background:var(--kv-mist);
  color:var(--kv-ink);
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  white-space:nowrap;
  transition:background .25s var(--kv-ease),color .25s var(--kv-ease);
}
.page-faq .kb-rail__num{
  font-family:var(--kv-mono);
  font-size:11px;
  color:var(--kv-steel);
  letter-spacing:.06em;
}
.page-faq .kb-rail__link:hover{
  background:rgba(45,226,230,.22);
}
.page-faq .kb-rail__link[aria-current="true"]{
  background:var(--kv-deep);
  color:var(--kv-cyan);
}
.page-faq .kb-rail__link[aria-current="true"] .kb-rail__num{
  color:var(--kv-orange);
}
.page-faq .kb-rail__note{
  margin-top:14px;
  padding-top:14px;
  border-top:1px solid var(--faq-line);
}
.page-faq .kb-rail__note p{
  margin:0;
  font-size:13px;
  line-height:1.8;
  color:var(--faq-ink-soft);
}

/* ---------- 问答流 ---------- */
.page-faq .kb-cat{
  margin-bottom:clamp(30px,4.4vw,54px);
  scroll-margin-top:130px;
}
.page-faq .kb-cat--last{
  margin-bottom:0;
}
.page-faq .kb-cat__head{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding-bottom:10px;
  border-bottom:2px solid var(--kv-deep);
  margin-bottom:14px;
}
.page-faq .kb-cat__num{
  font-family:var(--kv-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--kv-cyan);
  background:var(--kv-deep);
  border-radius:6px;
  padding:3px 7px;
}
.page-faq .kb-cat h2{
  margin:0;
  font-family:var(--kv-sans);
  font-weight:800;
  font-size:clamp(19px,2.6vw,26px);
  letter-spacing:-.01em;
  color:var(--kv-deep);
}
.page-faq .kb-cat__desc{
  margin:0 0 18px;
  max-width:64ch;
  font-size:15px;
  line-height:1.82;
  color:var(--faq-ink-soft);
}

.page-faq .kb-figure{
  margin:0 0 20px;
  border-radius:var(--kv-radius-m);
  overflow:hidden;
  background:var(--kv-paper);
  border:1px solid var(--faq-line);
}
.page-faq .kb-figure img{
  display:block;
  width:100%;
  height:auto;
  max-width:100%;
  object-fit:cover;
}
.page-faq .kb-figure__cap{
  padding:10px 16px;
  border-top:1px solid var(--faq-line);
  font-size:13px;
  line-height:1.7;
  color:var(--kv-steel);
}

/* 手风琴 */
.page-faq .kb-qa{
  background:var(--kv-paper);
  border:1px solid var(--faq-line);
  border-radius:var(--kv-radius-m);
  margin-bottom:12px;
  transition:border-color .25s var(--kv-ease),box-shadow .25s var(--kv-ease);
}
.page-faq .kb-qa:hover{
  border-color:rgba(45,226,230,.7);
}
.page-faq .kb-qa[open]{
  border-color:rgba(45,226,230,.9);
  box-shadow:0 16px 34px -30px rgba(10,34,56,.85);
}
.page-faq .kb-qa summary{
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:17px 18px;
  cursor:pointer;
  list-style:none;
  font-size:16px;
  font-weight:600;
  line-height:1.6;
  color:var(--kv-ink);
}
.page-faq .kb-qa summary::-webkit-details-marker{
  display:none;
}
.page-faq .kb-qa summary::after{
  content:"+";
  margin-left:auto;
  flex:0 0 auto;
  font-family:var(--kv-mono);
  font-size:20px;
  line-height:1;
  color:var(--kv-steel);
  transition:color .25s var(--kv-ease);
}
.page-faq .kb-qa[open] summary::after{
  content:"–";
  color:var(--kv-orange);
}
.page-faq .kb-qa summary:focus-visible{
  outline:2px solid var(--kv-cyan);
  outline-offset:-3px;
  border-radius:var(--kv-radius-m);
}
.page-faq .kb-qa__index{
  flex:0 0 auto;
  font-family:var(--kv-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--kv-steel);
  padding-top:4px;
}
.page-faq .kb-qa__a{
  padding:0 18px 18px 18px;
  margin-left:0;
}
.page-faq .kb-qa__a p{
  margin:0;
  font-size:15px;
  line-height:1.86;
  color:var(--faq-ink-soft);
}
.page-faq .kb-price{
  display:inline-block;
  padding:1px 8px;
  margin:0 1px;
  border-radius:6px;
  background:rgba(255,138,61,.16);
  color:#a8490f;
  font-size:14px;
  font-weight:600;
}
.page-faq .kb-link{
  color:var(--faq-link);
  text-decoration:underline;
  text-underline-offset:3px;
}
.page-faq .kb-link:hover{
  color:var(--kv-deep);
}

/* ---------- 帮助区 ---------- */
.page-faq .kb-help{
  position:relative;
  overflow:hidden;
  border-radius:var(--kv-radius-l);
  background:linear-gradient(150deg,var(--kv-deep),var(--kv-night));
  color:var(--kv-paper);
  padding:clamp(22px,4vw,40px);
}
.page-faq .kb-help::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:6px;
  background-image:repeating-linear-gradient(90deg,var(--kv-cyan) 0 1px,transparent 1px 16px);
  opacity:.55;
}
.page-faq .kb-help__lede{
  margin:0;
  max-width:56ch;
  font-size:clamp(16px,2vw,19px);
  line-height:1.78;
  color:#fff;
}
.page-faq .kb-help__tip{
  margin:14px 0 0;
  max-width:60ch;
  font-size:14px;
  line-height:1.85;
  color:rgba(247,250,252,.78);
}
.page-faq .kb-help__mail{
  margin:18px 0 0;
  padding-top:16px;
  border-top:1px solid rgba(221,231,238,.18);
  font-size:14px;
  line-height:1.8;
  color:var(--kv-cyan);
  word-break:break-all;
}
.page-faq .kb-help__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:22px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width:860px){
  .page-faq .kb-hero__grid{
    grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);
  }
}

@media (min-width:940px){
  .page-faq .kb-layout{
    grid-template-columns:252px minmax(0,1fr);
  }
  .page-faq .kb-rail{
    position:sticky;
    top:132px;
    padding:20px;
  }
  .page-faq .kb-rail__nav{
    flex-direction:column;
    overflow:visible;
    gap:4px;
    padding-bottom:0;
  }
  .page-faq .kb-rail__link{
    border-radius:12px;
    background:transparent;
    padding:10px 12px;
    white-space:normal;
    font-size:14px;
  }
  .page-faq .kb-rail__link:hover{
    background:rgba(45,226,230,.18);
  }
  .page-faq .kb-qa summary{
    padding:20px 22px;
    font-size:17px;
  }
  .page-faq .kb-qa__a{
    padding:0 22px 22px 22px;
  }
}

@media (min-width:1180px){
  .page-faq .kb-cat__desc{
    font-size:16px;
  }
}

@media (prefers-reduced-motion:reduce){
  .page-faq .kb-hero__jump a,
  .page-faq .kb-rail__link,
  .page-faq .kb-qa{
    transition:none;
  }
}