.page-contact {
  --pc-sec: clamp(56px, 8vw, 96px);
  --pc-flow: clamp(28px, 4vw, 44px);
  display: block;
  background: var(--felt);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.75;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-contact .breadcrumb {
  padding: 22px 0 18px;
  border-bottom: 1px solid var(--rule-soft);
}
.page-contact .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-sm);
  color: var(--stone);
}
.page-contact .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.page-contact .breadcrumb [aria-current="page"] {
  color: var(--paper-soft);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  padding: clamp(40px, 6vw, 72px) 0 var(--pc-sec);
}
.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}
.page-contact h1 {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5.6vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-contact .contact-hero__lede {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper-soft);
}

/* 渠道卡片堆叠 */
.page-contact .channel-stack {
  display: grid;
  gap: 16px;
  margin-top: var(--pc-flow);
}
.page-contact .channel-card {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 18px;
  padding: 24px;
  background: var(--felt-deep);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  overflow: hidden;
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease), transform 160ms var(--ease);
}
.page-contact .channel-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--red);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 160ms var(--ease);
}
.page-contact .channel-card:hover,
.page-contact .channel-card:focus-within {
  border-color: var(--gold);
  background: var(--felt-lift);
  transform: translateY(-2px);
}
.page-contact .channel-card:hover::before,
.page-contact .channel-card:focus-within::before {
  transform: scaleY(1);
}
.page-contact .channel-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--gold-bright);
  background: rgba(168, 132, 44, 0.08);
}
.page-contact .channel-card__body {
  flex: 1 1 240px;
  min-width: 0;
}
.page-contact .channel-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: var(--fs-md);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-contact .channel-card__desc {
  margin: 8px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper-soft);
}
.page-contact .channel-card__value {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--gold-bright);
  word-break: break-all;
}
.page-contact .channel-card__action {
  flex: 0 0 auto;
  align-self: flex-end;
  margin-left: auto;
}

/* 首屏竖图 */
.page-contact .hero-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  background: var(--felt-deep);
}
.page-contact .hero-media img {
  display: block;
  width: 100%;
  height: auto;
}
.page-contact .hero-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 16px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--paper-soft);
  background: linear-gradient(to top, rgba(10, 15, 13, 0.92), rgba(10, 15, 13, 0));
}
.page-contact .hero-media__caption::before {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  top: 12px;
  height: 1px;
  background: var(--rule);
}

/* ---------- 章节骨架 ---------- */
.page-contact .chapter {
  position: relative;
  padding: var(--pc-sec) 0;
  border-top: 1px solid var(--rule-soft);
}
.page-contact .chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 16px;
  margin-bottom: clamp(28px, 4vw, 44px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule-soft);
}
.page-contact .chapter__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
  color: var(--gold-bright);
}
.page-contact .chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-contact .chapter__note {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--stone);
}
.page-contact .chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

/* ---------- 地址与备案 ---------- */
.page-contact .contact-facts {
  margin: 0;
  border-top: 1px solid var(--rule-soft);
}
.page-contact .contact-facts__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.page-contact .contact-facts dt {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--stone);
}
.page-contact .contact-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}
.page-contact .contact-facts dd.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.page-contact .fact-aside {
  align-self: start;
}

.page-contact .fold {
  padding: 0 20px;
  background: var(--felt-deep);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--red);
  border-radius: 2px;
}
.page-contact .fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 0;
  font-family: var(--font-head);
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--gold-bright);
  cursor: pointer;
  list-style: none;
}
.page-contact .fold summary::-webkit-details-marker {
  display: none;
}
.page-contact .fold summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--red);
}
.page-contact .fold[open] summary::after {
  content: "−";
}
.page-contact .fold[open] summary {
  border-bottom: 1px solid var(--rule-soft);
}
.page-contact .fold__body {
  padding: 16px 0 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-soft);
}
.page-contact .fold__body p {
  margin: 0 0 12px;
}
.page-contact .fold__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 反馈清单 ---------- */
.page-contact .brief-media {
  margin: 0 0 clamp(28px, 4vw, 40px);
  max-width: 820px;
}
.page-contact .brief-media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
}
.page-contact .brief {
  max-width: 640px;
}
.page-contact .brief__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule-soft);
}
.page-contact .brief__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding: 20px 0;
  border-bottom: 1px dashed var(--rule-soft);
}
.page-contact .brief__key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
  color: var(--gold-bright);
}
.page-contact .brief__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-contact .brief__text {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-soft);
}
.page-contact .brief__after {
  margin-top: var(--pc-flow);
  padding: 22px 24px;
  background: var(--felt-deep);
  border-left: 3px solid var(--red);
  border-radius: 2px;
}
.page-contact .brief__after h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-contact .brief__after p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-soft);
}

/* ---------- 自助入口 ---------- */
.page-contact .route-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-contact .route-list__item {
  display: flex;
}
.page-contact .route-list__link {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 6px 16px;
  width: 100%;
  padding: 22px;
  text-decoration: none;
  background: var(--felt-deep);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease), transform 160ms var(--ease);
}
.page-contact .route-list__link:hover,
.page-contact .route-list__link:focus-visible {
  border-color: var(--gold-bright);
  background: var(--felt-lift);
  transform: translateY(-2px);
}
.page-contact .route-list__label {
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
  color: var(--gold);
}
.page-contact .route-list__title {
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-contact .route-list__desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--paper-soft);
}

/* ---------- 合作与纠错 ---------- */
.page-contact .duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-contact .duo__card {
  padding: 26px 24px;
  background: linear-gradient(180deg, var(--felt-deep), var(--felt));
  border: 1px solid var(--rule-soft);
  border-top: 2px solid var(--gold);
  border-radius: 2px;
}
.page-contact .duo__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-contact .duo__card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-soft);
}
.page-contact .duo__card p:last-child {
  margin-bottom: 0;
}
.page-contact .duo__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--gold-bright);
}

/* ---------- 响应式 ---------- */
@media (max-width: 479px) {
  .page-contact .channel-card {
    padding: 20px 18px;
  }
  .page-contact .channel-card__action {
    margin-left: 0;
  }
  .page-contact .brief__after {
    padding: 20px 18px;
  }
}

@media (min-width: 560px) {
  .page-contact .contact-facts__row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-contact .route-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-contact .chapter__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
  }
  .page-contact .duo {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 960px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
  }
}