.page-faq{
  --faq-top: clamp(64px, 9vw, 96px);
  --faq-gap: clamp(24px, 4vw, 46px);
  --faq-rule: 1px solid var(--line);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb{
  padding-top: 14px;
  font-size: 13px;
}
.page-faq .breadcrumb-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
}
.page-faq .breadcrumb-list li + li::before{
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-faq .breadcrumb-list a{
  color: var(--muted);
  text-decoration: none;
}
.page-faq .breadcrumb-list a:hover{ color: var(--live); }

/* ---------- 首屏 ---------- */
.page-faq .faq-hero{
  padding-top: var(--faq-top);
  padding-bottom: clamp(26px, 5vw, 52px);
}
.page-faq .faq-hero-grid{
  display: grid;
  gap: var(--faq-gap);
}
.page-faq .faq-hero-copy h1{
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.12;
  letter-spacing: -.02em;
  margin: 10px 0 16px;
  font-weight: 800;
}
.page-faq .faq-hero-copy .lead{
  max-width: 56ch;
  color: var(--muted);
  font-size: clamp(15.5px, 2.1vw, 17.5px);
  line-height: 1.8;
  margin: 0;
}
.page-faq .faq-jump{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.page-faq .faq-jump a{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-900);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  transition: border-color .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);
}
.page-faq .faq-jump a:hover{
  border-color: var(--live);
  color: var(--live);
  transform: translateY(-2px);
}
.page-faq .faq-jump-num{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--live);
}
.page-faq .faq-hero-media{
  margin: 0;
}
.page-faq .faq-hero-media .media-frame{
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.page-faq .faq-hero-media img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body{
  display: grid;
  gap: var(--faq-gap);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-faq .faq-nav{
  border: var(--faq-rule);
  border-radius: var(--r-m);
  background: var(--ink-900);
  padding: 16px 16px 14px;
}
.page-faq .faq-nav-title{
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}
.page-faq .faq-nav-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.page-faq .faq-nav-list li{ flex: 0 0 auto; }
.page-faq .faq-nav-link{
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  white-space: nowrap;
  border-radius: var(--r-s);
  border-bottom: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}
.page-faq .faq-nav-link:hover,
.page-faq .faq-nav-link:focus-visible{
  color: var(--text);
  background: var(--ink-800);
  border-bottom-color: var(--live);
}
.page-faq .faq-nav-idx{
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--live);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group{
  margin-bottom: clamp(34px, 5vw, 58px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-faq .faq-group:last-child{ margin-bottom: 0; }

.page-faq .faq-group-head{
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
}
.page-faq .faq-group-num{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--goal);
}
.page-faq .faq-group-head h2{
  margin: 0;
  font-size: clamp(21px, 3.6vw, 30px);
  letter-spacing: -.01em;
  font-weight: 800;
}
.page-faq .faq-group-note{
  margin: 10px 0 18px;
  max-width: 64ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list{
  border-bottom: var(--faq-rule);
}
.page-faq .qa{
  border-top: var(--faq-rule);
}
.page-faq .qa summary{
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15.5px, 2.1vw, 17px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
  transition: color .2s var(--ease);
}
.page-faq .qa summary::-webkit-details-marker{ display: none; }
.page-faq .qa summary::before{
  content: "";
  flex: 0 0 3px;
  align-self: stretch;
  min-height: 22px;
  border-radius: 3px;
  background: var(--line);
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
}
.page-faq .qa summary:hover::before,
.page-faq .qa summary:focus-visible::before{
  background: var(--sub);
}
.page-faq .qa[open] summary{ color: var(--live); }
.page-faq .qa[open] summary::before{
  background: var(--live);
  box-shadow: 0 0 14px rgba(37, 224, 200, .5);
}
.page-faq .qa-mark{
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.3;
  color: var(--muted);
  transition: color .2s var(--ease);
}
.page-faq .qa-mark::after{ content: "+"; }
.page-faq .qa[open] .qa-mark{ color: var(--live); }
.page-faq .qa[open] .qa-mark::after{ content: "–"; }

.page-faq .qa-body{
  padding: 0 0 20px 17px;
}
.page-faq .qa-body p{
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.82;
}
.page-faq .qa-body p:last-child{ margin-bottom: 0; }
.page-faq .qa-body a{
  color: var(--live);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 224, 200, .35);
}
.page-faq .qa-body a:hover{ border-bottom-color: var(--live); }

/* ---------- 章节插图 ---------- */
.page-faq .faq-figure{
  margin: 24px 0 0;
}
.page-faq .faq-figure img{
  display: block;
  width: 100%;
  height: auto;
  border: var(--faq-rule);
  border-radius: var(--r-m);
}
.page-faq .faq-figure figcaption{
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
  font-family: var(--font-mono);
}

/* ---------- 联系条 ---------- */
.page-faq .faq-contact{
  margin-top: clamp(30px, 4.5vw, 48px);
  display: grid;
  gap: 20px;
  padding: clamp(20px, 3.5vw, 34px);
  border: var(--faq-rule);
  border-radius: var(--r-l);
  background: linear-gradient(140deg, var(--ink-800), var(--ink-900) 62%);
}
.page-faq .faq-contact h2{
  margin: 0 0 10px;
  font-size: clamp(19px, 3vw, 25px);
  font-weight: 800;
}
.page-faq .faq-contact p{
  margin: 0;
  max-width: 48ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
}
.page-faq .faq-contact-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--text);
  word-break: break-word;
}
.page-faq .faq-contact-list li{
  padding-left: 12px;
  border-left: 2px solid var(--line);
}
.page-faq .faq-contact-list li:first-child{ border-left-color: var(--live); }

/* ---------- 宽屏 ---------- */
@media (min-width: 760px){
  .page-faq .faq-contact{
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: center;
  }
}

@media (min-width: 960px){
  .page-faq .faq-hero-grid{
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: end;
  }
  .page-faq .faq-body{
    grid-template-columns: 236px minmax(0, 1fr);
  }
  .page-faq .faq-nav{
    position: sticky;
    top: calc(var(--header-h) + 16px);
    align-self: start;
    padding: 18px;
  }
  .page-faq .faq-nav-list{
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }
  .page-faq .faq-nav-list li{ flex: 1 1 auto; }
  .page-faq .faq-nav-link{
    border-bottom: none;
    border-left: 2px solid transparent;
    border-radius: 0 var(--r-s) var(--r-s) 0;
  }
  .page-faq .faq-nav-link:hover,
  .page-faq .faq-nav-link:focus-visible{
    border-bottom-color: transparent;
    border-left-color: var(--live);
  }
}

@media (prefers-reduced-motion: reduce){
  .page-faq .faq-jump a,
  .page-faq .qa summary,
  .page-faq .qa-mark,
  .page-faq .faq-nav-link{
    transition: none;
  }
  .page-faq .faq-jump a:hover{ transform: none; }
}