.page-contact {
  --ct-measure: 720px;
  --ct-rail-gap: clamp(24px, 4vw, 48px);
  padding: var(--s5) 0 var(--s8);
  position: relative;
}

.page-contact .crumbs {
  margin-bottom: var(--s5);
}

/* ---------- 首屏 ---------- */
.page-contact .ct-hero {
  position: relative;
  padding-top: var(--s5);
  border-bottom: 1px solid var(--hair);
  padding-bottom: var(--s6);
}

.page-contact .ct-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 2px;
  background: var(--amber);
}

.page-contact .ct-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2) var(--s3);
  align-items: baseline;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mute);
  text-transform: uppercase;
}

.page-contact .ct-hero h1 {
  margin: var(--s4) 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(36px, 7vw, 88px);
  line-height: 1.04;
  letter-spacing: -.03em;
  color: var(--paper);
  max-width: 17ch;
}

.page-contact .ct-hero__lede {
  margin: var(--s4) 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.85;
  color: var(--cold);
}

.page-contact .ct-hero__strip {
  margin-top: var(--s6);
  border-top: 1px solid var(--hair);
  display: grid;
  grid-template-columns: 1fr;
}

.page-contact .ct-hero__cell {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hair);
}

.page-contact .ct-hero__cell + .ct-hero__cell {
  border-left: 0;
}

.page-contact .ct-hero__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mute);
  text-transform: uppercase;
}

.page-contact .ct-hero__cell b {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 14px;
  color: var(--paper);
  word-break: break-all;
}

/* ---------- 主结构 ---------- */
.page-contact .ct-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ct-rail-gap);
  margin-top: var(--s6);
}

.page-contact .ct-main {
  min-width: 0;
}

.page-contact .ct-rail {
  min-width: 0;
}

.page-contact .ct-rail__figure {
  margin: 0;
}

.page-contact .ct-legend {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  border-top: 1px solid var(--hair);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--s4);
}

.page-contact .ct-legend__link {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: 10px;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px solid var(--hair);
  text-decoration: none;
  color: var(--cold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  transition: color 180ms var(--ease);
}

.page-contact .ct-legend__mark {
  width: 8px;
  height: 8px;
  border: 1px solid var(--hair-strong);
  background: transparent;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-contact .ct-legend__link:hover {
  color: var(--paper);
}

.page-contact .ct-legend__link:hover .ct-legend__mark {
  border-color: var(--fluoro);
}

.page-contact .ct-legend__link[aria-current="true"] {
  color: var(--paper);
}

.page-contact .ct-legend__link[aria-current="true"] .ct-legend__mark {
  background: var(--amber);
  border-color: var(--amber);
}

/* ---------- 区块骨架 ---------- */
.page-contact .ct-block {
  padding: var(--s6) 0 0;
  border-top: 1px solid var(--hair);
  margin-top: var(--s6);
}

.page-contact .ct-block:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.page-contact .ct-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-contact .ct-block__intro {
  margin: var(--s3) 0 0;
  max-width: 62ch;
  color: var(--cold);
  font-size: 16px;
  line-height: 1.85;
}

.page-contact .ct-link {
  color: var(--fluoro);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 176, .42);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-contact .ct-link:hover {
  color: var(--paper);
  border-color: var(--paper);
}

/* ---------- 渠道 ---------- */
.page-contact .ct-channels {
  margin-top: var(--s4);
}

.page-contact .ct-channel {
  display: grid;
  gap: var(--s2);
  padding: var(--s4) 0;
  border-bottom: 1px solid var(--hair);
}

.page-contact .ct-channel__top {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin: 0;
}

.page-contact .ct-channel__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--fluoro);
}

.page-contact .ct-channel__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  color: var(--paper);
  letter-spacing: .01em;
}

.page-contact .ct-channel__desc {
  margin: 0;
  color: var(--cold);
  font-size: 15px;
  line-height: 1.85;
}

.page-contact .ct-channel__contact {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--paper);
  word-break: break-all;
}

.page-contact .ct-channel__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mute);
}

/* ---------- 表单 ---------- */
.page-contact .ct-form {
  margin-top: var(--s4);
  border: 1px solid var(--hair-strong);
  background: var(--board);
  padding: clamp(16px, 3vw, 32px);
  display: grid;
  gap: var(--s4);
}

.page-contact .ct-form__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s3);
}

.page-contact .ct-field {
  display: grid;
  gap: 6px;
  border: 1px solid var(--hair-strong);
  background: rgba(10, 18, 32, .55);
  padding: 12px 14px;
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-contact .ct-field:focus-within {
  border-color: var(--fluoro);
  box-shadow: inset 0 0 0 1px var(--fluoro);
}

.page-contact .ct-field__label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--cold);
  text-transform: uppercase;
}

.page-contact .ct-field input,
.page-contact .ct-field select,
.page-contact .ct-field textarea {
  width: 100%;
  padding: 0;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
}

.page-contact .ct-field textarea {
  min-height: 124px;
  resize: vertical;
}

.page-contact .ct-field select option {
  background: var(--ink);
  color: var(--paper);
}

.page-contact .ct-field ::placeholder {
  color: var(--mute);
}

.page-contact .ct-form__foot {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s3);
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--hair);
  padding-top: var(--s3);
}

.page-contact .ct-form__hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 合作清单 ---------- */
.page-contact .ct-checklist {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hair);
}

.page-contact .ct-checklist__item {
  position: relative;
  padding: 13px 0 13px 22px;
  border-bottom: 1px solid var(--hair);
  color: var(--cold);
  font-size: 15px;
  line-height: 1.75;
}

.page-contact .ct-checklist__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--fluoro);
}

/* ---------- 回复节奏（暖纸区） ---------- */
.page-contact .ct-response {
  margin-top: var(--s4);
  background: var(--paper);
  color: var(--ink);
  padding: clamp(18px, 3.5vw, 40px);
  display: grid;
  gap: var(--s5);
}

.page-contact .ct-response__copy {
  min-width: 0;
}

.page-contact .ct-response__lead {
  margin: 0 0 var(--s4);
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.85;
}

.page-contact .ct-response__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--s3);
}

.page-contact .ct-response__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
}

.page-contact .ct-response__step b {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-soft);
  border: 1px solid var(--hair-paper);
  padding: 3px 7px;
  line-height: 1.2;
}

.page-contact .ct-response__figure {
  margin: 0;
}

.page-contact .ct-response__figure .media-frame__caption {
  color: var(--mute);
}

/* ---------- 通信与备案 ---------- */
.page-contact .ct-postal__list {
  list-style: none;
  margin: var(--s4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s3);
}

.page-contact .ct-postal__row {
  display: grid;
  gap: 5px;
  padding-bottom: var(--s3);
  border-bottom: 1px solid var(--hair);
}

.page-contact .ct-postal__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mute);
  text-transform: uppercase;
}

.page-contact .ct-postal__val {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-all;
}

.page-contact .ct-postal__note {
  margin: var(--s4) 0 0;
  max-width: 62ch;
  color: var(--cold);
  font-size: 14px;
  line-height: 1.8;
}

.page-contact .ct-postal__icp {
  margin: var(--s5) 0 0;
  padding-top: var(--s3);
  border-top: 1px dashed var(--hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .ct-form__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .ct-field--full {
    grid-column: 1 / -1;
  }
}

@media (min-width: 720px) {
  .page-contact .ct-hero__strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .ct-hero__cell {
    padding: 16px 0;
    border-bottom: 0;
  }

  .page-contact .ct-hero__cell + .ct-hero__cell {
    border-left: 1px solid var(--hair);
    padding-left: 20px;
  }
}

@media (min-width: 860px) {
  .page-contact .ct-response {
    display: flex;
    gap: var(--s5);
    align-items: flex-start;
  }

  .page-contact .ct-response__copy {
    flex: 1 1 56%;
  }

  .page-contact .ct-response__figure {
    flex: 1 1 44%;
  }
}

@media (min-width: 1000px) {
  .page-contact .ct-shell {
    grid-template-columns: minmax(240px, 300px) minmax(0, var(--ct-measure)) minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-contact .ct-rail {
    grid-column: 1;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }

  .page-contact .ct-main {
    grid-column: 2;
  }

  .page-contact .ct-legend {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .ct-legend__link,
  .page-contact .ct-legend__mark,
  .page-contact .ct-field,
  .page-contact .ct-link {
    transition: none;
  }
}