.page-contact{
  --ct-rail:340px;
  --ct-gap:40px;
  background:var(--deep);
  color:var(--ice);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero{
  position:relative;
  padding:40px 0 38px;
  overflow:hidden;
  border-bottom:1px solid var(--reef);
  background:
    radial-gradient(720px 360px at 6% -34%, rgba(56,240,208,.16), transparent 72%),
    radial-gradient(600px 300px at 94% 2%, rgba(255,106,43,.13), transparent 74%),
    var(--deep);
}
.page-contact .contact-hero::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:6px;
  background-image:repeating-linear-gradient(90deg, rgba(143,168,191,.42) 0 1px, transparent 1px 22px);
  pointer-events:none;
}
.page-contact .contact-hero .breadcrumb{
  margin-bottom:18px;
}
.page-contact .contact-hero h1{
  margin:12px 0 0;
  font-family:var(--font-display);
  font-size:clamp(28px, 6.4vw, 50px);
  line-height:1.14;
  letter-spacing:-.01em;
  color:var(--ice);
  max-width:20em;
}
.page-contact .contact-hero__lead{
  margin:18px 0 0;
  max-width:60ch;
  font-size:16px;
  line-height:1.8;
  color:var(--mist);
}
.page-contact .contact-hero__jump{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:26px;
}
.page-contact .contact-hero__jump .btn{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
}

/* ---------- 分屏主体 ---------- */
.page-contact .contact-split{
  padding:48px 0 64px;
}
.page-contact .contact-split__grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:32px;
  align-items:start;
}

/* 左侧信息卡 */
.page-contact .contact-card{
  position:relative;
  border:1px solid var(--reef);
  border-radius:var(--radius);
  overflow:hidden;
  background:var(--glass);
  -webkit-backdrop-filter:blur(var(--blur));
  backdrop-filter:blur(var(--blur));
}
.page-contact .contact-card__bg{
  position:absolute;
  inset:0;
  z-index:0;
}
.page-contact .contact-card__bg img{
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.3;
  display:block;
}
.page-contact .contact-card__bg::after{
  content:"";
  position:absolute;
  inset:0;
  background:
    linear-gradient(180deg, rgba(6,26,47,.5), rgba(6,26,47,.95) 64%),
    repeating-linear-gradient(0deg, rgba(143,168,191,.09) 0 1px, transparent 1px 38px),
    repeating-linear-gradient(90deg, rgba(143,168,191,.09) 0 1px, transparent 1px 38px);
}
.page-contact .contact-card__inner{
  position:relative;
  z-index:1;
  padding:22px 20px 20px;
}
.page-contact .contact-card__head{
  margin:0 0 4px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.page-contact .contact-card__list{
  margin:10px 0 0;
}
.page-contact .citem{
  display:grid;
  grid-template-columns:84px minmax(0,1fr);
  gap:10px;
  padding:14px 0;
  border-top:1px solid rgba(27,58,92,.85);
}
.page-contact .citem:first-child{
  border-top:none;
}
.page-contact .citem dt{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
  padding-top:3px;
}
.page-contact .citem dd{
  margin:0;
  font-family:var(--font-mono);
  font-size:14.5px;
  line-height:1.5;
  color:var(--ice);
  word-break:break-word;
}
.page-contact .citem dd.is-text{
  font-family:var(--font-body);
  font-size:14px;
  line-height:1.65;
  color:var(--ice);
}
.page-contact .citem dd a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(56,240,208,.35);
  transition:border-color .2s ease, color .2s ease;
}
.page-contact .citem dd a:hover,
.page-contact .citem dd a:focus-visible{
  color:var(--ice);
  border-color:var(--orange);
}
.page-contact .contact-card__note{
  margin:16px 0 0;
  padding-top:14px;
  border-top:1px dashed var(--reef);
  font-size:12.5px;
  line-height:1.75;
  color:var(--mist);
}

/* ---------- 右侧内容流 ---------- */
.page-contact .csection{
  margin-top:52px;
}
.page-contact .csection:first-child{
  margin-top:0;
}
.page-contact .csection .section-title{
  font-family:var(--font-display);
  font-size:clamp(22px, 4.6vw, 32px);
  line-height:1.22;
  color:var(--ice);
  margin:6px 0 0;
}
.page-contact .csection .media-frame{
  margin:22px 0 0;
  border:1px solid var(--reef);
  border-radius:var(--radius);
  overflow:hidden;
  background:var(--midnight);
}
.page-contact .csection .media-frame img{
  width:100%;
  height:auto;
  display:block;
}
.page-contact .csection .media-frame__cap{
  padding:12px 16px;
  font-size:12.5px;
  line-height:1.65;
  color:var(--mist);
  background:rgba(6,26,47,.72);
  border-top:1px solid var(--reef);
}

/* 方向标签 */
.page-contact .coop-tabs{
  margin-top:22px;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.page-contact .coop-tabs .filter-btn{
  font-family:var(--font-display);
  font-size:14px;
  letter-spacing:.02em;
  padding:8px 16px;
  border-radius:999px;
  border:1px solid var(--reef);
  background:rgba(12,39,69,.7);
  color:var(--mist);
  cursor:pointer;
  transition:color .2s ease, border-color .2s ease, background .2s ease;
}
.page-contact .coop-tabs .filter-btn:hover{
  color:var(--ice);
  border-color:rgba(56,240,208,.5);
}
.page-contact .coop-tabs .filter-btn.is-active,
.page-contact .coop-tabs .filter-btn[aria-pressed="true"]{
  color:var(--deep);
  background:var(--cyan);
  border-color:var(--cyan);
}

.page-contact .coop-panels{
  margin-top:20px;
  display:grid;
  gap:14px;
}
.page-contact .coop-panel{
  border:1px solid var(--reef);
  border-left:2px solid var(--cyan);
  border-radius:var(--radius);
  background:linear-gradient(180deg, rgba(12,39,69,.88), rgba(12,39,69,.54));
  padding:20px 20px 18px;
}
.page-contact .coop-panel.is-hidden{
  display:none;
}
.page-contact .coop-panel__name{
  margin:0 0 10px;
  font-family:var(--font-display);
  font-size:18px;
  letter-spacing:.01em;
  color:var(--ice);
}
.page-contact .coop-panel__who{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:0 0 12px;
}
.page-contact .coop-panel p{
  margin:0 0 10px;
  font-size:15px;
  line-height:1.78;
  color:var(--mist);
  max-width:66ch;
}
.page-contact .coop-panel p:last-child{
  margin-bottom:0;
}
.page-contact .coop-panel strong{
  color:var(--ice);
  font-weight:700;
}
.page-contact .coop-panel__link a{
  display:inline-block;
  font-size:14px;
  font-family:var(--font-display);
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(56,240,208,.4);
  padding-bottom:2px;
}
.page-contact .coop-panel__link a:hover{
  color:var(--orange);
  border-color:var(--orange);
}

/* 流程步骤 */
.page-contact .flow{
  margin-top:22px;
}
.page-contact .flow-step{
  border:1px solid var(--reef);
  border-radius:var(--radius);
  background:linear-gradient(180deg, rgba(12,39,69,.9), rgba(12,39,69,.62));
  margin-bottom:12px;
  overflow:hidden;
}
.page-contact .flow-step[open]{
  border-color:rgba(56,240,208,.42);
}
.page-contact .flow-step summary{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 14px;
  padding:16px 18px;
  cursor:pointer;
  list-style:none;
}
.page-contact .flow-step summary::-webkit-details-marker{
  display:none;
}
.page-contact .flow-step__no{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--orange);
  flex:none;
}
.page-contact .flow-step__title{
  font-family:var(--font-display);
  font-size:17px;
  color:var(--ice);
  flex:0 1 auto;
}
.page-contact .flow-step__meta{
  margin-left:auto;
  flex:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--amber);
  border:1px solid rgba(255,179,71,.4);
  border-radius:999px;
  padding:2px 9px;
  white-space:nowrap;
}
.page-contact .flow-step summary::after{
  content:"+";
  flex:none;
  font-family:var(--font-mono);
  font-size:15px;
  line-height:1;
  color:var(--cyan);
}
.page-contact .flow-step[open] summary::after{
  content:"–";
}
.page-contact .flow-step__body{
  margin:0 18px;
  padding:14px 0 18px;
  border-top:1px dashed var(--reef);
}
.page-contact .flow-step__body p{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--mist);
  max-width:66ch;
}

/* 常见疑问 */
.page-contact .qa{
  margin:22px 0 0;
  border-top:1px solid var(--reef);
}
.page-contact .qa__row{
  padding:18px 0;
  border-bottom:1px solid var(--reef);
}
.page-contact .qa__q{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:16px;
  line-height:1.5;
  color:var(--ice);
}
.page-contact .qa__q::before{
  content:"Q";
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--orange);
  margin-right:8px;
}
.page-contact .qa__a{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--mist);
  max-width:64ch;
}

/* 问题反馈 */
.page-contact .fb-list{
  list-style:none;
  margin:22px 0 0;
  padding:0;
  display:grid;
  gap:12px;
}
.page-contact .fb-list li{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:14px;
  padding:16px 18px;
  border:1px solid var(--reef);
  border-radius:var(--radius);
  background:rgba(12,39,69,.5);
  font-size:15px;
  line-height:1.75;
  color:var(--mist);
}
.page-contact .fb-list b{
  color:var(--ice);
  font-weight:700;
}
.page-contact .fb-list__n{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--cyan);
  padding-top:4px;
}

/* ---------- 邮件清单 ---------- */
.page-contact .mail-plan{
  margin-top:56px;
  padding:48px 0 64px;
  border-top:1px solid var(--reef);
  background:
    radial-gradient(680px 300px at 16% 0%, rgba(56,240,208,.1), transparent 72%),
    radial-gradient(560px 260px at 88% 100%, rgba(255,106,43,.08), transparent 74%),
    var(--midnight);
}
.page-contact .mail-plan__head .section-title{
  font-family:var(--font-display);
  font-size:clamp(22px, 4.6vw, 30px);
  line-height:1.24;
  color:var(--ice);
  margin:6px 0 0;
}
.page-contact .mail-plan__grid{
  margin-top:26px;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:12px;
}
.page-contact .mail-item{
  position:relative;
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:14px 16px;
  border:1px solid var(--reef);
  border-radius:12px;
  background:rgba(6,26,47,.62);
  cursor:pointer;
  font-size:14.5px;
  line-height:1.68;
  color:var(--ice);
  transition:border-color .2s ease, background .2s ease;
}
.page-contact .mail-item input{
  position:absolute;
  width:1px;
  height:1px;
  opacity:0;
  pointer-events:none;
}
.page-contact .mail-item__box{
  position:relative;
  flex:none;
  width:18px;
  height:18px;
  margin-top:2px;
  border:1px solid var(--mist);
  border-radius:5px;
  background:rgba(6,26,47,.8);
  transition:background .2s ease, border-color .2s ease;
}
.page-contact .mail-item__text{
  min-width:0;
}
.page-contact .mail-item input:checked ~ .mail-item__box{
  background:var(--cyan);
  border-color:var(--cyan);
}
.page-contact .mail-item input:checked ~ .mail-item__box::after{
  content:"";
  position:absolute;
  left:5px;
  top:1px;
  width:5px;
  height:10px;
  border:solid var(--deep);
  border-width:0 2px 2px 0;
  transform:rotate(45deg);
}
.page-contact .mail-item input:focus-visible ~ .mail-item__box{
  outline:2px solid var(--cyan);
  outline-offset:2px;
}
.page-contact .mail-item:hover{
  border-color:rgba(56,240,208,.45);
}
.page-contact .mail-plan__foot{
  margin-top:28px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px 20px;
}
.page-contact .mail-plan__foot p{
  margin:0;
  flex:1 1 280px;
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
}
.page-contact .mail-plan__foot p a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(56,240,208,.35);
}
.page-contact .mail-plan__foot p a:hover{
  color:var(--orange);
  border-color:var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width:640px){
  .page-contact .mail-plan__grid{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .page-contact .contact-card__inner{
    padding:24px 22px 22px;
  }
}

@media (min-width:900px){
  .page-contact .contact-hero{
    padding:56px 0 52px;
  }
  .page-contact .contact-split{
    padding:64px 0 80px;
  }
  .page-contact .contact-split__grid{
    grid-template-columns:minmax(0,var(--ct-rail)) minmax(0,1fr);
    gap:var(--ct-gap);
  }
  .page-contact .contact-card{
    position:sticky;
    top:96px;
  }
  .page-contact .csection{
    margin-top:72px;
  }
  .page-contact .mail-plan{
    margin-top:80px;
    padding:56px 0 76px;
  }
}

@media (min-width:1100px){
  .page-contact .mail-plan__grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
}

@media (prefers-reduced-motion:reduce){
  .page-contact .contact-card__bg img{
    opacity:.3;
  }
  .page-contact .mail-item,
  .page-contact .coop-tabs .filter-btn,
  .page-contact .citem dd a{
    transition:none;
  }
}
<<<END>>>