.page-contact{
  --letter-w: 46rem;
  --letter-ink: var(--ink);
  background: var(--paper);
  color: var(--letter-ink);
  font-family: var(--font-body);
}

/* 页首 */
.page-contact .contact-hero{
  position: relative;
  overflow: hidden;
  background: linear-gradient(155deg, #14253F 0%, #1E3A66 58%, #3C5F97 100%);
  color: var(--paper);
}
.page-contact .contact-hero__texture{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
  pointer-events: none;
}
.page-contact .contact-hero__inner{
  position: relative;
  z-index: 1;
  padding-top: clamp(20px, 4vw, 36px);
  padding-bottom: clamp(46px, 9vw, 88px);
}
.page-contact .contact-hero .breadcrumb__list{
  color: rgba(251, 247, 240, .7);
  font-size: .82rem;
}
.page-contact .contact-hero .breadcrumb__link{
  color: rgba(251, 247, 240, .86);
}
.page-contact .contact-hero .breadcrumb__current{
  color: var(--paper);
}
.page-contact .contact-hero .eyebrow{
  margin-top: clamp(26px, 5vw, 46px);
  color: var(--brick-soft);
  letter-spacing: .12em;
  font-size: .8rem;
}
.page-contact .contact-hero .page-title{
  margin: clamp(12px, 2vw, 20px) 0 0;
  max-width: 20ch;
  color: var(--paper);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -.02em;
}
.page-contact .contact-hero .page-lede{
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 40rem;
  color: rgba(251, 247, 240, .88);
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  line-height: 1.85;
}

/* 书信正文 */
.page-contact .letter-band{
  background: var(--paper);
  border-top: 3px solid var(--brick);
}
.page-contact .letter{
  max-width: var(--letter-w);
  margin: 0 auto;
  padding: clamp(38px, 6.5vw, 72px) 0 0;
}
.page-contact .letter__section{
  margin: 0 0 clamp(42px, 7vw, 72px);
}
.page-contact .letter__section > .section-title{
  margin: 0 0 .7em;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.25;
}
.page-contact .letter__lead{
  margin: 0 0 clamp(18px, 3vw, 26px);
  color: var(--graphite);
  font-size: 1rem;
  line-height: 1.85;
}
.page-contact .letter__lead--fine{
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-size: .9rem;
  color: var(--graphite);
}
.page-contact .letter__lead a{
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid var(--brick-soft);
  padding-bottom: 1px;
}
.page-contact .letter__lead a:hover{
  color: var(--brick);
  border-bottom-color: var(--brick);
}

/* 渠道吊牌 */
.page-contact .channel{
  display: grid;
  gap: 14px;
}
.page-contact .channel__card{
  position: relative;
  background: var(--sand);
  border: 1px solid var(--indigo-mid);
  border-radius: 2px;
  box-shadow: none;
}
.page-contact .channel__card::before{
  content: "";
  position: absolute;
  top: 16px;
  left: 15px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--indigo-mid);
  background: var(--paper);
  z-index: 2;
}
.page-contact .channel__card[open]{
  background: var(--sand);
}
.page-contact .channel__summary{
  display: grid;
  grid-template-columns: 1fr;
  gap: 3px;
  padding: 13px 16px 13px 38px;
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease);
}
.page-contact .channel__summary::-webkit-details-marker{
  display: none;
}
.page-contact .channel__summary:hover{
  background: rgba(185, 199, 222, .18);
}
.page-contact .channel__label{
  color: var(--brick);
  font-size: .76rem;
  letter-spacing: .14em;
}
.page-contact .channel__value{
  color: var(--ink);
  font-size: 1.05rem;
  word-break: break-all;
}
.page-contact .channel__hint{
  color: var(--graphite);
  font-size: .85rem;
  line-height: 1.6;
}
.page-contact .channel__body{
  margin: 0;
  padding: 12px 16px 16px 38px;
  border-top: 1px dashed var(--line);
  color: var(--graphite);
  font-size: .95rem;
  line-height: 1.85;
}
.page-contact .channel__body p{
  margin: 0;
}

/* 信息图与图注 */
.page-contact .sheet{
  margin: 0 0 10px;
  padding: 10px;
  background: var(--sand);
  border: var(--rule);
}
.page-contact .sheet img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--paper);
}
.page-contact .sheet__caption{
  margin: 0 0 clamp(18px, 3vw, 26px);
  color: var(--graphite);
  font-size: .86rem;
  line-height: 1.7;
}

/* 六项清单 */
.page-contact .checklist{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-contact .checklist__item{
  margin: 0;
}
.page-contact .checklist__label{
  display: grid;
  grid-template-columns: 18px 2rem 1fr;
  gap: 10px;
  align-items: start;
  padding: 12px 14px;
  background: rgba(255, 255, 255, .6);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-contact .checklist__label:hover{
  border-color: var(--indigo-mid);
  background: rgba(255, 255, 255, .9);
}
.page-contact .checklist__box{
  appearance: none;
  -webkit-appearance: none;
  justify-self: start;
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  border: 1px solid var(--indigo-mid);
  border-radius: 1px;
  background: var(--paper);
  cursor: pointer;
  position: relative;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-contact .checklist__box:checked{
  background: var(--brick);
  border-color: var(--brick);
}
.page-contact .checklist__box:checked::after{
  content: "";
  position: absolute;
  left: 5px;
  top: 2px;
  width: 5px;
  height: 10px;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(40deg);
}
.page-contact .checklist__num{
  color: var(--brick);
  font-size: .82rem;
  padding-top: 4px;
}
.page-contact .checklist__text{
  color: var(--ink);
  font-size: .95rem;
  line-height: 1.8;
  transition: opacity var(--dur) var(--ease);
}
.page-contact .checklist__text strong{
  font-weight: 500;
  color: var(--indigo);
}
.page-contact .checklist__box:checked ~ .checklist__text{
  opacity: .5;
}

/* 邮件模板 */
.page-contact .template{
  margin-top: clamp(22px, 3.6vw, 32px);
}
.page-contact .template__note{
  margin: 0 0 10px;
  color: var(--graphite);
  font-size: .88rem;
  line-height: 1.7;
}
.page-contact .mail-template{
  margin: 0;
  padding: 18px 18px 18px 22px;
  background: var(--sand);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brick);
  font-family: var(--font-mono);
  font-size: .85rem;
  line-height: 1.95;
  color: var(--ink);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
  tab-size: 2;
}
.page-contact .mail-template code{
  font-family: inherit;
  font-size: inherit;
}

/* 提示条 */
.page-contact .notice{
  margin-top: clamp(18px, 3vw, 24px);
  padding: 16px 18px;
  background: var(--mist);
  border-left: 3px solid var(--brick);
  color: var(--ink);
}
.page-contact .notice p{
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ink);
}
.page-contact .notice .notice__title{
  margin: 0 0 6px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--indigo);
}

/* 自查指引 */
.page-contact .precheck{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-contact .precheck__item{
  padding-left: 16px;
  border-left: 2px solid var(--line);
}
.page-contact .precheck__link{
  display: inline-block;
  color: var(--indigo);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.6;
  text-decoration: none;
  border-bottom: 1px solid var(--brick-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-contact .precheck__link:hover{
  color: var(--brick);
  border-bottom-color: var(--brick);
}
.page-contact .precheck__desc{
  display: block;
  margin-top: 5px;
  color: var(--graphite);
  font-size: .93rem;
  line-height: 1.8;
}

/* 收尾 */
.page-contact .contact-tail{
  margin-top: clamp(34px, 6vw, 64px);
  padding: clamp(18px, 3vw, 24px) 0 clamp(56px, 10vw, 104px);
  border-top: 1px solid var(--indigo);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  align-items: baseline;
  justify-content: space-between;
}
.page-contact .contact-tail__addr{
  margin: 0;
  color: var(--graphite);
  font-size: .9rem;
  line-height: 1.7;
}
.page-contact .contact-tail__legal{
  margin: 0;
  color: var(--graphite);
  font-size: .8rem;
  letter-spacing: .02em;
}

@media (min-width: 700px){
  .page-contact .channel__summary{
    grid-template-columns: 5.5rem 1fr;
    column-gap: 16px;
    align-items: baseline;
    padding: 15px 20px 15px 40px;
  }
  .page-contact .channel__label{
    grid-column: 1;
    grid-row: 1;
  }
  .page-contact .channel__value{
    grid-column: 2;
    grid-row: 1;
    font-size: 1.15rem;
  }
  .page-contact .channel__hint{
    grid-column: 2;
    grid-row: 2;
  }
  .page-contact .channel__body{
    padding: 14px 20px 18px 40px;
  }
  .page-contact .mail-template{
    font-size: .9rem;
    padding: 22px 22px 22px 26px;
  }
}

@media (max-width: 560px){
  .page-contact .contact-hero .page-title{
    max-width: none;
    line-height: 1.12;
  }
  .page-contact .checklist__label{
    grid-template-columns: 17px 1.6rem 1fr;
    gap: 8px;
    padding: 11px 12px;
  }
  .page-contact .mail-template{
    font-size: .78rem;
    line-height: 1.85;
  }
  .page-contact .precheck__item{
    padding-left: 12px;
  }
  .page-contact .contact-tail{
    flex-direction: column;
  }
}
<<<END>>>