/* ===== 常见问题页 · 作用域 .page-faq ===== */
.page-faq{
  --faq-accent: var(--cyan-500);
  --faq-a-pad-l: clamp(38px, 6vw, 54px);
  display:block;
  padding-bottom: clamp(48px,7vw,110px);
}

/* ---- 首屏 ---- */
.page-faq .faq-hero{
  position:relative;
  padding: clamp(18px,3vw,32px) 0 clamp(32px,5vw,60px);
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(680px 420px at 88% 4%, rgba(25,211,197,.16), transparent 70%),
    radial-gradient(520px 360px at 2% 100%, rgba(255,107,74,.12), transparent 72%);
  background-repeat:no-repeat;
}

.page-faq .faq-hero-inner{
  display:grid;
  gap: clamp(26px,4vw,48px);
  margin-top: clamp(18px,3vw,30px);
}

.page-faq .faq-hero h1{
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(29px,4.6vw,50px);
  line-height:1.16;
  letter-spacing:-0.02em;
  font-weight:800;
  color: var(--white-050);
}

.page-faq .faq-lede{
  margin: clamp(14px,2vw,20px) 0 0;
  max-width:58ch;
  font-size: clamp(15px,1.6vw,17px);
  line-height:1.9;
  color: var(--gray-400);
}

.page-faq .faq-facts{
  display:flex;
  flex-wrap:wrap;
  gap: 12px 30px;
  margin: clamp(20px,3vw,32px) 0 0;
  padding: 0;
  list-style:none;
}

.page-faq .faq-facts li{
  display:flex;
  align-items:baseline;
  gap:9px;
  font-size:13px;
  letter-spacing:.05em;
  color: var(--gray-400);
}

.page-faq .fact-num{
  font-family: var(--font-mono);
  font-size: clamp(16px,1.9vw,21px);
  letter-spacing:.02em;
  color: var(--cyan-300);
}

.page-faq .fact-label{
  white-space:nowrap;
}

/* ---- 视觉容器 ---- */
.page-faq .faq-visual{
  margin:0;
  border:1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow:hidden;
  background: var(--glass);
  box-shadow: 0 28px 64px -42px rgba(0,0,0,.9);
}

.page-faq .faq-visual img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  aspect-ratio:4 / 3;
  object-fit:cover;
}

.page-faq .faq-visual--small img{
  aspect-ratio:3 / 2;
}

/* ---- 主体：索引轨道 + 问答流 ---- */
.page-faq .faq-body{
  display:grid;
  gap: clamp(26px,4vw,40px);
  padding-top: clamp(32px,5vw,56px);
}

.page-faq .index-title{
  margin:0 0 14px;
  font-family: var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color: var(--gray-400);
}

.page-faq .index-list{
  display:flex;
  gap:8px;
  margin:0;
  padding: 0 0 6px;
  list-style:none;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}

.page-faq .index-link{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  padding:10px 15px;
  border:1px solid var(--line-soft);
  border-radius:999px;
  background: var(--glass);
  color: var(--white-050);
  font-size:14px;
  text-decoration:none;
  white-space:nowrap;
  transition: border-color .25s var(--ease), color .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .index-link:hover,
.page-faq .index-link:focus-visible{
  border-color: var(--cyan-500);
  color: var(--cyan-300);
  background: rgba(25,211,197,.08);
  outline:none;
}

.page-faq .index-num{
  font-family: var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color: var(--cyan-500);
}

/* ---- 分组 ---- */
.page-faq .faq-group{
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-faq .faq-group + .faq-group{
  margin-top: clamp(36px,5vw,64px);
  padding-top: clamp(36px,5vw,64px);
  border-top:1px solid var(--line-soft);
}

.page-faq .group-head{
  margin-bottom: clamp(16px,2.4vw,24px);
}

.page-faq .group-head h2{
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: clamp(21px,2.9vw,30px);
  line-height:1.32;
  letter-spacing:-0.01em;
  color: var(--white-050);
}

.page-faq .group-head h2::before{
  content:"";
  display:block;
  width:34px;
  height:3px;
  border-radius:2px;
  margin-bottom:12px;
  background: var(--faq-accent);
}

.page-faq .group-head p{
  margin:0;
  max-width:58ch;
  font-size:15px;
  line-height:1.85;
  color: var(--gray-400);
}

/* 分组强调色 */
.page-faq .faq-group[data-accent="cyan"]{ --faq-accent: var(--cyan-500); }
.page-faq .faq-group[data-accent="amber"]{ --faq-accent: var(--amber-400); }
.page-faq .faq-group[data-accent="mint"]{ --faq-accent: var(--mint-400); }
.page-faq .faq-group[data-accent="meta"]{ --faq-accent: var(--cyan-300); }
.page-faq .faq-group[data-accent="coral"]{ --faq-accent: var(--coral-500); }

/* ---- 折叠问答 ---- */
.page-faq .qa{
  border:1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  transition: border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .qa + .qa{
  margin-top:10px;
}

.page-faq .qa:hover{
  border-color: rgba(127,240,228,.32);
}

.page-faq .qa[open]{
  border-color: rgba(127,240,228,.44);
  background: var(--glass-strong);
}

.page-faq .qa > summary{
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding: clamp(14px,2.1vw,20px) clamp(14px,2.2vw,22px);
  cursor:pointer;
  list-style:none;
  color: var(--white-050);
}

.page-faq .qa > summary::-webkit-details-marker{ display:none; }
.page-faq .qa > summary::marker{ content:""; }

.page-faq .qa > summary:focus-visible{
  outline:2px solid var(--cyan-500);
  outline-offset:-2px;
  border-radius: var(--radius);
}

.page-faq .qa-num{
  flex:0 0 auto;
  min-width:2.4ch;
  padding-top:3px;
  font-family: var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color: var(--faq-accent);
}

.page-faq .qa-q{
  flex:1 1 auto;
  font-size: clamp(15px,1.85vw,17px);
  font-weight:600;
  line-height:1.65;
}

.page-faq .qa-icon{
  position:relative;
  flex:0 0 auto;
  width:18px;
  height:18px;
  margin-top:4px;
  border:1px solid var(--line);
  border-radius:50%;
  transition: border-color .25s var(--ease);
}

.page-faq .qa-icon::before,
.page-faq .qa-icon::after{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:8px;
  height:1.5px;
  background: var(--gray-400);
  transform: translate(-50%,-50%);
  transition: transform .28s var(--ease), background-color .28s var(--ease), opacity .2s var(--ease);
}

.page-faq .qa-icon::after{
  transform: translate(-50%,-50%) rotate(90deg);
}

.page-faq .qa[open] .qa-icon{
  border-color: rgba(127,240,228,.4);
}

.page-faq .qa[open] .qa-icon::before{
  background: var(--faq-accent);
}

.page-faq .qa[open] .qa-icon::after{
  transform: translate(-50%,-50%) rotate(0deg) scaleX(0);
  opacity:0;
}

.page-faq .qa-a{
  padding: 0 clamp(14px,2.2vw,22px) clamp(16px,2.4vw,22px) var(--faq-a-pad-l);
  max-width:70ch;
  font-size:15px;
  line-height:1.9;
  color: var(--gray-400);
}

.page-faq .qa-a p{
  margin: 0 0 10px;
}

.page-faq .qa-a p:last-child{
  margin-bottom:0;
}

.page-faq .qa-a a{
  display:inline-block;
  color: var(--cyan-300);
  font-size:14px;
  text-decoration:none;
  border-bottom:1px solid rgba(25,211,197,.45);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-faq .qa-a a::after{
  content:" →";
  font-family: var(--font-mono);
  font-size:12px;
}

.page-faq .qa-a a:hover,
.page-faq .qa-a a:focus-visible{
  color: var(--white-050);
  border-color: var(--coral-500);
  outline:none;
}

.page-faq .mono{
  font-family: var(--font-mono);
  font-size:.94em;
  letter-spacing:.02em;
  color: var(--white-050);
  word-break:break-all;
}

@keyframes faq-rise{
  from{ opacity:0; transform: translateY(-4px); }
  to{ opacity:1; transform: none; }
}

.page-faq .qa[open] .qa-a{
  animation: faq-rise .3s var(--ease) both;
}

/* ---- 联系分组：图文错位 ---- */
.page-faq .contact-split{
  display:grid;
  gap: clamp(18px,3vw,30px);
}

/* ---- 平板及以上 ---- */
@media (min-width: 760px){
  .page-faq .contact-split{
    grid-template-columns: minmax(0,.72fr) minmax(0,1.28fr);
    align-items:start;
  }
}

/* ---- 桌面：左侧索引轨道 + 错位内容区 ---- */
@media (min-width: 1024px){
  .page-faq .faq-hero-inner{
    grid-template-columns: minmax(0,1.08fr) minmax(0,.92fr);
    align-items:center;
  }

  .page-faq .faq-visual{
    transform: translateY(10px);
  }

  .page-faq .faq-body{
    grid-template-columns: minmax(0,2fr) minmax(0,1fr) minmax(0,8fr);
    align-items:start;
  }

  .page-faq .faq-index{
    grid-column:1;
    position:sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-faq .faq-list{
    grid-column:3;
    min-width:0;
  }

  .page-faq .index-list{
    flex-direction:column;
    gap:2px;
    overflow:visible;
    padding:0;
    border-left:1px solid var(--line);
  }

  .page-faq .index-link{
    position:relative;
    justify-content:flex-start;
    padding:10px 0 10px 16px;
    border:0;
    border-radius:0;
    background:none;
    font-size:14px;
  }

  .page-faq .index-link:hover,
  .page-faq .index-link:focus-visible{
    background:none;
  }

  .page-faq .index-link::before{
    content:"";
    position:absolute;
    left:-1px;
    top:50%;
    width:2px;
    height:0;
    background: var(--cyan-500);
    transform: translateY(-50%);
    transition: height .28s var(--ease);
  }

  .page-faq .index-link:hover::before,
  .page-faq .index-link:focus-visible::before{
    height:62%;
  }
}

/* ---- 无障碍：减少动效 ---- */
@media (prefers-reduced-motion: reduce){
  .page-faq .qa[open] .qa-a{ animation:none; }
  .page-faq .qa-icon::before,
  .page-faq .qa-icon::after,
  .page-faq .index-link::before,
  .page-faq .index-link,
  .page-faq .qa{ transition:none; }
}