.page-faq{
  --faq-radius: 3px;
  --faq-line: rgba(38,68,95,.55);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-mast{
  padding: calc(var(--header-h) + 24px) 0 56px;
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--faq-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-line) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: center top;
  border-bottom: 1px solid var(--steel);
}
.page-faq .faq-mast .crumbs{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 28px;
}
.page-faq .faq-mast .crumbs a{
  color: var(--mist);
  text-decoration: none;
}
.page-faq .faq-mast .crumbs a:hover{
  color: var(--amber-soft);
}
.page-faq .faq-mast__grid{
  display: grid;
  gap: 32px;
}
.page-faq .faq-mast__lead .eyebrow{
  color: var(--amber);
  margin-bottom: 16px;
}
.page-faq .faq-mast__lead h1{
  margin: 0 0 20px;
  font-family: var(--sans);
  font-size: clamp(32px, 7vw, 54px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-faq .faq-mast__lead .lede{
  margin: 0;
  max-width: 48ch;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.78;
}
.page-faq .faq-mast__panel{
  background: rgba(18,41,61,.74);
  border: 1px solid var(--steel);
  border-radius: var(--faq-radius);
  padding: 20px 18px;
  backdrop-filter: blur(8px);
}
.page-faq .faq-mast__panel-title{
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gray);
  text-transform: uppercase;
}
.page-faq .faq-mast__list{
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}
.page-faq .faq-mast__list li{
  display: grid;
  grid-template-columns: 10px minmax(0,1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(38,68,95,.7);
}
.page-faq .faq-mast__list li:last-child{
  border-bottom: 0;
}
.page-faq .faq-mast__list a{
  color: var(--paper);
  font-size: 15px;
  text-decoration: none;
  line-height: 1.5;
}
.page-faq .faq-mast__list a:hover{
  color: var(--amber-soft);
}
.page-faq .faq-mast__count{
  font-size: 12px;
  color: var(--gray);
}
.page-faq .faq-mast__panel-foot{
  display: block;
  font-size: 13px;
  color: var(--amber);
  text-decoration: none;
  line-height: 1.6;
}
.page-faq .faq-mast__panel-foot:hover{
  color: var(--amber-soft);
}

/* ---------- 通用三步 ---------- */
.page-faq .faq-steps{
  background: var(--paper);
  color: var(--ink);
  padding: 56px 0;
}
.page-faq .faq-steps .eyebrow{
  color: var(--steel);
  margin-bottom: 12px;
}
.page-faq .faq-steps .section__title{
  margin: 0 0 14px;
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-faq .faq-steps .section__lead{
  margin: 0 0 28px;
  max-width: 58ch;
  color: #3a4c5e;
  font-size: 15px;
  line-height: 1.78;
}
.page-faq .faq-steps__grid{
  display: grid;
  gap: 36px;
}
.page-faq .faq-steps__list{
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid rgba(38,68,95,.28);
}
.page-faq .faq-steps__item{
  display: grid;
  grid-template-columns: 40px minmax(0,1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(38,68,95,.28);
}
.page-faq .faq-steps__num{
  font-size: 13px;
  color: var(--amber);
  padding-top: 3px;
  letter-spacing: .02em;
}
.page-faq .faq-steps__text h3{
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
}
.page-faq .faq-steps__text p{
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3a4c5e;
}
.page-faq .faq-steps__note{
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 14px;
  line-height: 1.7;
  color: #3a4c5e;
}
.page-faq .faq-steps__media{
  border: 1px solid rgba(38,68,95,.28);
  background: #ffffff;
  border-radius: var(--faq-radius);
  overflow: hidden;
}
.page-faq .faq-steps__media .media__caption{
  padding: 10px 14px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: #5b6b7b;
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-body{
  padding: 56px 0;
  background: var(--ink);
}
.page-faq .faq-body__grid{
  display: grid;
  gap: 32px;
}
.page-faq .faq-rail__title{
  color: var(--gray);
  margin: 0 0 14px;
}
.page-faq .faq-rail__nav{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-faq .faq-rail__link{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--steel);
  border-radius: var(--faq-radius);
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .16s var(--ease), color .16s var(--ease), transform .16s var(--ease);
}
.page-faq .faq-rail__link:hover{
  color: var(--paper);
  border-color: var(--amber);
  transform: translateY(-2px);
}
.page-faq .faq-rail__hint{
  display: none;
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

.page-faq .faq-group{
  scroll-margin-top: 96px;
  margin-bottom: 56px;
}
.page-faq .faq-group:last-child{
  margin-bottom: 0;
}
.page-faq .faq-group__head{
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.page-faq .faq-group__bar{
  display: block;
  width: 3px;
  height: 26px;
  background: var(--gray);
  border-radius: 2px;
}
.page-faq .faq-group[data-accent="device"] .faq-group__bar{ background: var(--gray); }
.page-faq .faq-group[data-accent="account"] .faq-group__bar{ background: var(--warn); }
.page-faq .faq-group[data-accent="shelf"] .faq-group__bar{ background: var(--ok); }

.page-faq .faq-group__title{
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  font-size: clamp(20px, 3.6vw, 26px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-faq .faq-group__lead{
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--gray);
}
.page-faq .faq-group__media{
  margin: 0 0 22px;
  border: 1px solid var(--steel);
  border-radius: var(--faq-radius);
  background: var(--hull);
  overflow: hidden;
}
.page-faq .faq-group__media .media__caption{
  padding: 10px 14px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}
.page-faq .faq-group__foot{
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}
.page-faq .faq-group__foot a{
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(245,165,36,.45);
}
.page-faq .faq-group__foot a:hover{
  color: var(--amber-soft);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa{
  background: var(--hull);
  border: 1px solid var(--steel);
  border-radius: var(--faq-radius);
  margin-bottom: 10px;
  transition: border-color .16s var(--ease);
}
.page-faq .qa__head{
  display: grid;
  grid-template-columns: auto minmax(0,1fr) 16px;
  align-items: start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  transition: background .16s var(--ease), box-shadow .16s var(--ease);
}
.page-faq .qa__head::-webkit-details-marker{ display: none; }
.page-faq .qa__head:hover{ background: rgba(38,68,95,.5); }
.page-faq .qa__head:focus-visible{
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}
.page-faq .qa__no{
  font-size: 12px;
  color: var(--gray);
  padding-top: 3px;
  letter-spacing: .04em;
}
.page-faq .qa__q{
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--paper);
}
.page-faq .qa__icon{
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
  justify-self: end;
}
.page-faq .qa__icon::before,
.page-faq .qa__icon::after{
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
  background: var(--amber);
  transition: transform .18s var(--ease);
}
.page-faq .qa__icon::after{ transform: rotate(90deg); }
.page-faq .qa[open] .qa__icon::after{ transform: rotate(0deg); }
.page-faq .qa[open]{
  border-color: rgba(245,165,36,.4);
}
.page-faq .qa[open] .qa__head{
  box-shadow: inset 2px 0 0 var(--amber);
  background: rgba(245,165,36,.05);
}
.page-faq .qa__body{
  padding: 0 16px 18px 16px;
}
.page-faq .qa__body p{
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.page-faq .qa__body p:last-child{
  margin-bottom: 0;
}
.page-faq .qa__more a{
  display: inline-block;
  font-size: 13px;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(245,165,36,.45);
  padding-bottom: 1px;
}
.page-faq .qa__more a:hover{
  color: var(--amber-soft);
}

/* ---------- 反馈 ---------- */
.page-faq .faq-help{
  padding: 56px 0 72px;
  background: var(--hull);
  border-top: 1px solid var(--steel);
}
.page-faq .faq-help__panel{
  display: grid;
  gap: 32px;
  border-top: 2px solid var(--amber);
  padding-top: 32px;
}
.page-faq .faq-help .eyebrow{
  color: var(--gray);
  margin-bottom: 12px;
}
.page-faq .faq-help__title{
  margin: 0 0 14px;
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-faq .faq-help__lead{
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}
.page-faq .faq-help__list{
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq .faq-help__list li{
  display: grid;
  grid-template-columns: 32px minmax(0,1fr);
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid rgba(38,68,95,.9);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}
.page-faq .faq-help__list li:last-child{
  border-bottom: 1px solid rgba(38,68,95,.9);
}
.page-faq .faq-help__num{
  font-size: 12px;
  color: var(--amber);
  padding-top: 3px;
}
.page-faq .faq-help__side{
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}
.page-faq .faq-help__side .btn{
  width: 100%;
  text-align: center;
}
.page-faq .faq-help__contact{
  width: 100%;
  margin-top: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--steel);
}
.page-faq .faq-help__contact .contact-line{
  display: grid;
  grid-template-columns: 48px minmax(0,1fr);
  gap: 10px;
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.6;
}
.page-faq .faq-help__contact .contact-line__key{
  color: var(--gray);
}
.page-faq .faq-help__contact .contact-line__val{
  color: var(--paper);
  overflow-wrap: anywhere;
}
.page-faq .faq-help__note{
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px){
  .page-faq .faq-steps,
  .page-faq .faq-body,
  .page-faq .faq-help{
    padding-top: 72px;
    padding-bottom: 72px;
  }
  .page-faq .faq-mast{
    padding-top: calc(var(--header-h) + 32px);
    padding-bottom: 72px;
  }
  .page-faq .qa__head{
    padding: 18px 22px;
    gap: 16px;
  }
  .page-faq .qa__q{
    font-size: 16px;
  }
  .page-faq .qa__body{
    padding: 0 22px 20px 22px;
  }
  .page-faq .qa__body p{
    font-size: 15px;
  }
  .page-faq .faq-help__side .btn{
    width: auto;
  }
  .page-faq .faq-help__panel{
    grid-template-columns: minmax(0,1.35fr) minmax(0,1fr);
    gap: 48px;
    padding-top: 40px;
  }
}

@media (min-width: 960px){
  .page-faq .faq-mast__grid{
    grid-template-columns: minmax(0,1.4fr) minmax(0,.85fr);
    align-items: end;
    gap: 56px;
  }
  .page-faq .faq-steps__grid{
    grid-template-columns: minmax(0,1.1fr) minmax(0,.9fr);
    gap: 56px;
    align-items: start;
  }
  .page-faq .faq-steps__media{
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1024px){
  .page-faq .faq-body__grid{
    grid-template-columns: 232px minmax(0,1fr);
    gap: 56px;
    align-items: start;
  }
  .page-faq .faq-rail{
    position: sticky;
    top: 104px;
  }
  .page-faq .faq-rail__nav{
    flex-direction: column;
    gap: 6px;
  }
  .page-faq .faq-rail__link{
    width: 100%;
    border-color: transparent;
    border-left: 2px solid var(--steel);
    border-radius: 0;
    padding: 9px 10px;
  }
  .page-faq .faq-rail__link:hover{
    transform: translateY(-2px);
    border-left-color: var(--amber);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }
  .page-faq .faq-rail__hint{
    display: block;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-faq .qa__head,
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .faq-rail__link{
    transition: none;
  }
  .page-faq .faq-rail__link:hover{
    transform: none;
  }
}
<<<END>>>