.page-contact {
  --pc-bw: 2px;
  --pc-off: 6px;
  display: block;
  padding-bottom: clamp(56px, 9vw, 110px);
}

/* ---------- 面包屑 ---------- */
.page-contact .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(20px, 4vw, 36px);
  margin-bottom: clamp(22px, 3.6vw, 36px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.page-contact .breadcrumb a {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: color var(--t-hover) var(--ease), border-color var(--t-hover) var(--ease);
}

.page-contact .breadcrumb a:hover,
.page-contact .breadcrumb a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-contact .breadcrumb .sep {
  color: var(--brass);
}

.page-contact .breadcrumb [aria-current="page"] {
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-contact .hero {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-contact .hero-eyebrow {
  margin: 0;
  color: var(--gold);
  letter-spacing: 0.16em;
}

.page-contact .hero h1 {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 66px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-contact .hero-lede {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.75;
  color: var(--cream);
  opacity: 0.84;
}

/* ---------- 折叠卡片 ---------- */
.page-contact .fold {
  margin-top: clamp(6px, 1.6vw, 14px);
  border: var(--pc-bw) solid var(--line-soft);
  background: var(--surface);
  box-shadow: var(--pc-off) var(--pc-off) 0 var(--ink-deep);
}

.page-contact .fold-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  list-style: none;
  cursor: pointer;
  background: var(--ink-deep);
  border-bottom: var(--pc-bw) solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold-soft);
  transition: background var(--t-hover) var(--ease), color var(--t-hover) var(--ease);
}

.page-contact .fold-summary::-webkit-details-marker {
  display: none;
}

.page-contact .fold-summary::after {
  content: "−";
  flex: none;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--gold);
}

.page-contact .fold-summary:hover {
  background: var(--surface);
}

.page-contact .fold-summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}

.page-contact .fold:not([open]) .fold-summary {
  border-bottom-color: transparent;
}

.page-contact .fold:not([open]) .fold-summary::after {
  content: "+";
}

.page-contact .fold-banner {
  margin: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-contact .fold-banner img {
  display: block;
  width: 100%;
  height: clamp(120px, 24vw, 240px);
  object-fit: cover;
}

.page-contact .fold-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .fold-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 18px;
  border-top: 1px solid var(--line);
}

.page-contact .fold-item:first-child {
  border-top: 0;
}

.page-contact .fold-item .no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brass);
  padding-top: 3px;
  font-variant-numeric: tabular-nums;
}

.page-contact .fold-copy {
  min-width: 0;
}

.page-contact .fold-copy .ttl {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cream);
}

.page-contact .fold-copy .desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.62;
  color: var(--cream);
  opacity: 0.66;
}

/* ---------- 渠道区 ---------- */
.page-contact .channels {
  margin-top: clamp(48px, 8vw, 94px);
}

.page-contact .section-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3.4vw, 32px);
  padding-bottom: 14px;
  border-bottom: var(--pc-bw) solid var(--line-soft);
}

.page-contact .section-head .eyebrow {
  margin: 0;
}

.page-contact .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-contact .section-note {
  margin: 0;
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
}

.page-contact .channel {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 3vw, 26px);
  border: var(--pc-bw) solid var(--line-soft);
  background: var(--surface);
  scroll-margin-top: 84px;
  transition: border-color var(--t-hover) var(--ease), box-shadow var(--t-hover) var(--ease);
}

.page-contact .channel + .channel {
  margin-top: 18px;
}

.page-contact .channel:hover,
.page-contact .channel:focus-within {
  border-color: var(--gold);
  box-shadow: var(--pc-off) var(--pc-off) 0 var(--ink-deep);
}

.page-contact .channel-mark {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-contact .channel-no {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brass);
  font-variant-numeric: tabular-nums;
}

.page-contact .channel-icon {
  flex: none;
  color: var(--mute);
  transition: color var(--t-hover) var(--ease);
}

.page-contact .channel:hover .channel-icon,
.page-contact .channel:focus-within .channel-icon {
  color: var(--gold);
}

.page-contact .channel:hover .channel-no,
.page-contact .channel:focus-within .channel-no {
  color: var(--gold-soft);
}

.page-contact .channel-body {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-contact .channel-body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.2vw, 26px);
  line-height: 1.2;
  color: var(--cream);
}

.page-contact .channel-value {
  display: block;
  margin: 0;
  padding: 9px 13px;
  border-left: 3px solid var(--gold);
  background: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: clamp(14px, 2.4vw, 17px);
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--gold-soft);
  overflow-wrap: anywhere;
  word-break: break-word;
  user-select: all;
  cursor: copy;
}

.page-contact .channel-fit {
  margin: 0;
  max-width: 66ch;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--cream);
  opacity: 0.86;
}

.page-contact .channel-note {
  margin: 0;
  padding-top: 11px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.66;
  color: var(--mute);
}

/* ---------- 响应口径 ---------- */
.page-contact .response {
  margin-top: clamp(50px, 8vw, 96px);
  padding-top: clamp(26px, 4vw, 44px);
  border-top: var(--pc-bw) solid var(--line-soft);
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-contact .response-flow {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  align-content: start;
}

.page-contact .response-flow .eyebrow {
  margin: 0;
}

.page-contact .resp-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-contact .response-block {
  padding-left: 16px;
  border-left: 1px solid var(--line-soft);
}

.page-contact .response-block h3 {
  margin: 0 0 7px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-contact .response-block p {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cream);
  opacity: 0.86;
}

.page-contact .response-media {
  margin: 0;
}

.page-contact .response-media img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--pc-bw) solid var(--line-soft);
}

.page-contact .response-media figcaption {
  margin-top: 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mute);
}

/* ---------- 收尾 ---------- */
.page-contact .tail {
  margin-top: clamp(40px, 7vw, 76px);
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line-soft);
  background: var(--ink-deep);
  display: grid;
  gap: 10px;
}

.page-contact .tail p {
  margin: 0;
  max-width: 76ch;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--cream);
  opacity: 0.8;
}

.page-contact .tail a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--mint);
  transition: color var(--t-hover) var(--ease), border-color var(--t-hover) var(--ease);
}

.page-contact .tail a:hover,
.page-contact .tail a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-contact a:focus-visible,
.page-contact summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 760px) {
  .page-contact .channel {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 0 24px;
    align-items: start;
  }

  .page-contact .channel-mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .page-contact .channel-no {
    font-size: 30px;
  }

  .page-contact .fold-item {
    grid-template-columns: 48px minmax(0, 1fr);
    padding: 15px 22px;
  }

  .page-contact .fold-summary {
    padding: 15px 22px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-contact .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(20px, 2.6vw, 30px);
  }

  .page-contact .fold {
    margin-top: clamp(10px, 1.8vw, 20px);
  }

  .page-contact .response {
    grid-template-columns: minmax(0, 1.16fr) minmax(0, 0.84fr);
    align-items: start;
    gap: clamp(30px, 4.5vw, 60px);
  }

  .page-contact .response-media img {
    height: clamp(280px, 32vw, 420px);
    object-fit: cover;
  }

  .page-contact .tail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .fold-summary,
  .page-contact .channel,
  .page-contact .channel-icon,
  .page-contact .channel-no,
  .page-contact .breadcrumb a,
  .page-contact .tail a {
    transition: none;
  }
}
<<<END>>>