.page-faq{
  --faq-muted:#B7C9D4;
  --faq-ink-line:#D7E2E8;
  background:var(--navy);
  color:var(--white);
  font-family:var(--font-body);
  padding-block:clamp(18px,3vw,32px) clamp(44px,7vw,88px);
  overflow-x:clip;
}

.page-faq .breadcrumb{
  margin-bottom:clamp(10px,2vw,18px);
}
.page-faq .breadcrumb-list{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
}
.page-faq .breadcrumb-list a{
  color:var(--cyan-soft);
  text-decoration:none;
}
.page-faq .breadcrumb-item[aria-current="page"]{
  color:var(--grey);
}

/* 首屏 */
.page-faq .faq-hero{
  display:grid;
  gap:clamp(18px,3vw,32px);
  padding-block:clamp(20px,3vw,36px) clamp(26px,4vw,52px);
  border-bottom:1px solid var(--line);
}
.page-faq .hero-figure{
  display:flex;
  align-items:flex-end;
  gap:14px;
}
.page-faq .hero-num{
  font-family:var(--font-display);
  font-weight:200;
  font-size:clamp(84px,17vw,168px);
  line-height:.78;
  letter-spacing:-.05em;
  color:var(--cyan);
}
.page-faq .hero-figure-note{
  font-size:12px;
  letter-spacing:.14em;
  color:var(--grey);
  padding-bottom:8px;
}
.page-faq .hero-kicker{
  margin:0 0 10px;
  font-size:12px;
  letter-spacing:.16em;
  color:var(--cyan);
}
.page-faq .hero-copy h1{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(27px,4.6vw,50px);
  line-height:1.12;
  letter-spacing:-.02em;
  max-width:16em;
}
.page-faq .hero-lead{
  margin:16px 0 0;
  max-width:42em;
  font-size:16px;
  line-height:1.75;
  color:var(--faq-muted);
}
.page-faq .hero-chips{
  margin-top:20px;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.page-faq .hero-chips .chip{
  text-decoration:none;
  font-size:13px;
}

/* 双栏骨架 */
.page-faq .faq-body{
  display:grid;
  gap:clamp(22px,4vw,44px);
  margin-top:clamp(22px,4vw,44px);
}
.page-faq .faq-main{
  min-width:0;
}

/* 左侧目录 */
.page-faq .faq-rail{
  min-width:0;
}
.page-faq .rail-title{
  margin:0 0 10px;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--grey);
}
.page-faq .rail-list{
  list-style:none;
  margin:0;
  padding:0 0 6px;
  display:flex;
  gap:6px;
  overflow-x:auto;
  scrollbar-width:none;
}
.page-faq .rail-list::-webkit-scrollbar{
  display:none;
}
.page-faq .rail-link{
  display:flex;
  align-items:center;
  gap:6px;
  padding:7px 11px;
  border:1px solid var(--line);
  color:var(--white);
  text-decoration:none;
  font-size:13px;
  white-space:nowrap;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.page-faq .rail-link:hover,
.page-faq .rail-link:focus-visible,
.page-faq .rail-link.is-active{
  color:var(--cyan);
  border-color:var(--cyan);
}
.page-faq .rail-key{
  font-size:11px;
  color:var(--orange);
}
.page-faq .rail-link.is-active .rail-key{
  color:var(--cyan-soft);
}

/* 章节 */
.page-faq .faq-sec{
  padding-block:clamp(24px,3.5vw,40px);
  border-top:1px solid var(--line);
  scroll-margin-top:calc(var(--header-h) + 20px);
}
.page-faq .faq-sec:first-child{
  border-top:0;
  padding-top:0;
}
.page-faq .sec-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:10px 16px;
  align-items:start;
}
.page-faq .sec-num{
  font-family:var(--font-display);
  font-weight:200;
  font-size:clamp(40px,7vw,68px);
  line-height:.85;
  letter-spacing:-.04em;
  color:var(--cyan);
}
.page-faq .sec-title{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(21px,3vw,30px);
  letter-spacing:-.02em;
  line-height:1.2;
}
.page-faq .sec-lead{
  margin:8px 0 0;
  max-width:40em;
  font-size:15px;
  line-height:1.75;
  color:var(--faq-muted);
}
.page-faq .sec-more{
  margin:18px 0 0;
}
.page-faq .more-link{
  display:inline-block;
  font-size:14px;
  font-weight:600;
  color:var(--orange);
  text-decoration:none;
  border-bottom:1px solid currentColor;
  padding-bottom:2px;
}
.page-faq .more-link:hover,
.page-faq .more-link:focus-visible{
  color:var(--cyan-soft);
}

/* 索引卡 */
.page-faq .index-grid{
  margin-top:20px;
  display:grid;
  gap:10px;
}
.page-faq .index-card{
  display:block;
  padding:16px 18px;
  background:var(--navy-2);
  border:1px solid var(--line);
  color:var(--white);
  text-decoration:none;
  clip-path:polygon(0 0,calc(100% - 14px) 0,100% 14px,100% 100%,0 100%);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.page-faq .index-card:hover,
.page-faq .index-card:focus-visible{
  border-color:var(--cyan);
  background:#123A60;
}
.page-faq .ic-key{
  display:block;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--cyan);
  margin-bottom:8px;
}
.page-faq .ic-title{
  display:block;
  font-size:16px;
  font-weight:700;
  line-height:1.4;
  letter-spacing:-.01em;
}
.page-faq .ic-text{
  display:block;
  margin-top:6px;
  font-size:13px;
  line-height:1.6;
  color:var(--faq-muted);
}

/* 步骤 */
.page-faq .steps{
  list-style:none;
  margin:20px 0 0;
  padding:0;
  display:grid;
  gap:8px;
}
.page-faq .step{
  display:grid;
  grid-template-columns:34px minmax(0,1fr);
  gap:12px;
  align-items:start;
  padding:12px 14px;
  border:1px solid var(--line);
  border-left:2px solid var(--orange);
  background:var(--navy-2);
}
.page-faq .step-n{
  font-size:12px;
  letter-spacing:.06em;
  color:var(--orange);
  padding-top:2px;
}
.page-faq .step strong{
  display:block;
  font-size:15px;
  font-weight:700;
  margin-bottom:3px;
}
.page-faq .step p{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--faq-muted);
}

/* 图片框 */
.page-faq .media-frame{
  display:block;
  margin:20px 0 0;
  background:var(--navy-2);
  border:1px solid var(--line);
  overflow:hidden;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}
.page-faq .media-frame img{
  display:block;
  width:100%;
  height:auto;
  max-width:100%;
  object-fit:cover;
}

/* 问答手风琴 */
.page-faq .qa-list{
  margin-top:20px;
  display:grid;
  gap:8px;
}
.page-faq .qa-item{
  background:var(--navy-2);
  border-left:2px solid var(--line);
}
.page-faq .qa-item[open]{
  border-left-color:var(--cyan);
}
.page-faq .qa-item summary{
  list-style:none;
  cursor:pointer;
  display:flex;
  align-items:flex-start;
  gap:10px;
  padding:14px 16px;
  font-size:15px;
  font-weight:600;
  line-height:1.5;
  color:var(--white);
}
.page-faq .qa-item summary::-webkit-details-marker{
  display:none;
}
.page-faq .qa-item summary::after{
  content:"+";
  margin-left:auto;
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:17px;
  line-height:1.1;
  color:var(--cyan);
}
.page-faq .qa-item[open] summary{
  color:var(--cyan-soft);
}
.page-faq .qa-item[open] summary::after{
  content:"–";
}
.page-faq .qa-item summary:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:-2px;
}
.page-faq .qa-body{
  padding:0 16px 16px;
  font-size:14px;
  line-height:1.75;
  color:var(--faq-muted);
}
.page-faq .qa-body p{
  margin:0 0 .7em;
}
.page-faq .qa-body p:last-child{
  margin-bottom:0;
}

/* 联系区块 */
.page-faq .contact-wrap{
  margin-top:20px;
  display:grid;
  gap:12px;
}
.page-faq .contact-card{
  background:var(--white);
  color:var(--ink);
  padding:clamp(18px,3vw,28px);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%);
}
.page-faq .contact-card .meta-row{
  display:flex;
  flex-wrap:wrap;
  gap:4px 12px;
  padding:11px 0;
  border-top:1px solid var(--faq-ink-line);
}
.page-faq .contact-card .meta-row:first-child{
  border-top:0;
  padding-top:0;
}
.page-faq .contact-card .meta-key{
  flex:0 0 84px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--grey);
  padding-top:3px;
}
.page-faq .contact-card .meta-val{
  flex:1 1 180px;
  min-width:0;
  font-size:16px;
  font-weight:700;
  word-break:break-word;
  color:var(--ink);
}
.page-faq .contact-note{
  margin:14px 0 0;
  font-size:14px;
  line-height:1.7;
  color:var(--grey);
}
.page-faq .contact-card .sec-more{
  margin-top:14px;
}
.page-faq .more-link-dark{
  color:#C2411C;
}
.page-faq .more-link-dark:hover,
.page-faq .more-link-dark:focus-visible{
  color:var(--navy-2);
}

/* 桌面端 */
@media (min-width:640px){
  .page-faq .index-grid{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .page-faq .contact-wrap{
    grid-template-columns:minmax(0,1fr) minmax(0,1fr);
    align-items:start;
  }
  .page-faq .contact-wrap .media-frame{
    margin-top:0;
  }
}

@media (min-width:900px){
  .page-faq .faq-hero{
    grid-template-columns:minmax(0,5fr) minmax(0,7fr);
    align-items:end;
  }
}

@media (min-width:1000px){
  .page-faq .faq-body{
    grid-template-columns:200px minmax(0,1fr);
    align-items:start;
  }
  .page-faq .faq-rail{
    position:sticky;
    top:calc(var(--header-h) + 24px);
    align-self:start;
  }
  .page-faq .rail-list{
    display:block;
    overflow:visible;
    padding-bottom:0;
  }
  .page-faq .rail-link{
    border:0;
    border-left:2px solid var(--line);
    padding:8px 0 8px 12px;
    opacity:.66;
    white-space:normal;
  }
  .page-faq .rail-link:hover,
  .page-faq .rail-link:focus-visible,
  .page-faq .rail-link.is-active{
    opacity:1;
    border-left-color:var(--cyan);
  }
  .page-faq .sec-head{
    gap:12px 22px;
  }
  .page-faq .index-grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
  .page-faq .index-card:nth-child(1){
    grid-column:span 2;
  }
  .page-faq .steps{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
}

@media (min-width:1180px){
  .page-faq .faq-body{
    grid-template-columns:220px minmax(0,1fr);
    gap:56px;
  }
  .page-faq .steps{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
  .page-faq .step{
    grid-template-columns:minmax(0,1fr);
  }
}

@media (prefers-reduced-motion:reduce){
  .page-faq .rail-link,
  .page-faq .index-card,
  .page-faq .more-link{
    transition:none;
  }
}
<<<END>>>