.page-contact {
  background: var(--paper);
  color: var(--graphite);
  padding-bottom: clamp(40px, 6vw, 80px);
  overflow-wrap: break-word;
}

.page-contact .crumbs {
  padding: clamp(14px, 2.4vw, 26px) 0 0;
  font: 700 12px/1.4 var(--sans);
  letter-spacing: .08em;
  color: var(--rock);
}

.page-contact .crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-contact .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-contact .crumbs a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-contact .crumbs a:hover,
.page-contact .crumbs a:focus-visible {
  border-bottom-color: var(--moss);
}

.page-contact h2 {
  margin: 0 0 14px;
  font: 700 clamp(26px, 3.4vw, 40px)/1.24 var(--serif);
  letter-spacing: 0;
  color: var(--ink);
}

.page-contact h3 {
  margin: 0 0 10px;
  font: 600 19px/1.4 var(--sans);
  color: var(--ink);
}

/* ---------- 首屏框景 ---------- */
.page-contact .co-hero {
  padding: clamp(18px, 3vw, 34px) 0 0;
}

.page-contact .co-hero__frame {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(28px, 5vw, 64px) clamp(20px, 4vw, 56px) clamp(38px, 5.5vw, 72px);
  border: 1px solid var(--line);
  background: linear-gradient(168deg, var(--card) 0%, var(--moss-bg) 100%);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .co-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 4px;
  background: var(--gold);
}

.page-contact .co-hero__scale {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 8px;
  background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 22px);
}

.page-contact .co-hero__copy h1 {
  margin: 0 0 20px;
  font: 700 clamp(30px, 4.6vw, 58px)/1.16 var(--serif);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-contact .co-hero__copy .lede {
  margin: 0;
  max-width: 62ch;
  font: 400 16px/1.75 var(--sans);
  color: var(--graphite);
}

.page-contact .co-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-contact .co-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-contact .co-hero__stats li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .co-hero__stats .num {
  min-width: 2.6em;
  font: 700 26px/1 var(--mono);
  letter-spacing: .02em;
  color: var(--moss);
}

.page-contact .co-hero__statlabel {
  font: 400 14px/1.5 var(--sans);
  color: var(--rock);
}

/* ---------- 通用区块 ---------- */
.page-contact .co-section {
  padding: clamp(48px, 7vw, 96px) 0 0;
}

.page-contact .co-section__head {
  max-width: 64ch;
  margin-bottom: clamp(22px, 3.6vw, 38px);
}

.page-contact .co-section__lede {
  margin: 0;
  font: 400 16px/1.75 var(--sans);
  color: var(--rock);
}

.page-contact .co-figure {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
}

/* ---------- 合作方向 ---------- */
.page-contact .co-dir-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

.page-contact .co-dir-card {
  padding: 26px 20px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent, var(--moss));
  border-radius: var(--radius);
}

.page-contact .co-dir-card:nth-child(1) { --accent: var(--vivid); }
.page-contact .co-dir-card:nth-child(2) { --accent: var(--gold); }
.page-contact .co-dir-card:nth-child(3) { --accent: var(--clay); }
.page-contact .co-dir-card:nth-child(4) { --accent: var(--moss); }

.page-contact .co-dir-card__no {
  margin: 0 0 14px;
  font: 700 12px/1 var(--mono);
  letter-spacing: .16em;
  color: var(--rock);
}

.page-contact .co-dir-card p {
  margin: 0 0 12px;
  font: 400 15px/1.75 var(--sans);
  color: var(--graphite);
}

.page-contact .co-dir-card p:last-child {
  margin-bottom: 0;
}

.page-contact .co-dir-card .co-dir-card__fit {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--rock);
}

/* ---------- 对接流程 ---------- */
.page-contact .co-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-contact .co-path {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-contact .co-path::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-contact .co-path__item {
  position: relative;
}

.page-contact .co-step {
  border-top: 1px solid var(--line);
}

.page-contact .co-path__item:last-child .co-step {
  border-bottom: 1px solid var(--line);
}

.page-contact .co-step > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 16px;
  align-items: center;
  gap: 18px;
  padding: 18px 0;
  min-height: 44px;
}

.page-contact .co-step > summary::-webkit-details-marker {
  display: none;
}

.page-contact .co-step > summary:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
}

.page-contact .co-step__node {
  position: relative;
  z-index: 1;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--paper);
  font: 700 15px/1 var(--mono);
  letter-spacing: .02em;
  border-radius: var(--radius);
  transition: background var(--speed);
}

.page-contact .co-step[open] .co-step__node {
  background: var(--moss);
}

.page-contact .co-step__title {
  font: 600 18px/1.4 var(--sans);
  color: var(--ink);
}

.page-contact .co-step__mark {
  position: relative;
  justify-self: end;
  width: 12px;
  height: 12px;
}

.page-contact .co-step__mark::before,
.page-contact .co-step__mark::after {
  content: "";
  position: absolute;
  background: var(--moss);
}

.page-contact .co-step__mark::before {
  left: 0;
  right: 0;
  top: 5px;
  height: 2px;
}

.page-contact .co-step__mark::after {
  top: 0;
  bottom: 0;
  left: 5px;
  width: 2px;
  transition: transform var(--speed);
}

.page-contact .co-step[open] .co-step__mark::after {
  transform: scaleY(0);
}

.page-contact .co-step__body {
  padding: 0 0 22px 62px;
  font: 400 15px/1.75 var(--sans);
  color: var(--graphite);
}

.page-contact .co-step__body p {
  margin: 0 0 10px;
}

.page-contact .co-step__body p:last-child {
  margin-bottom: 0;
}

.page-contact .co-step__tempo {
  display: inline-block;
  margin-top: 4px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  font: 700 12px/1 var(--mono);
  letter-spacing: .06em;
  color: var(--moss);
}

.page-contact .co-flow__figure {
  margin: 0;
}

/* ---------- 材料与联系 ---------- */
.page-contact .co-console {
  padding: clamp(48px, 7vw, 96px) 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-contact .co-console__main p {
  margin: 0 0 20px;
  font: 400 16px/1.75 var(--sans);
  color: var(--graphite);
  max-width: 58ch;
}

.page-contact .co-notes {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-contact .co-notes li {
  position: relative;
  padding: 14px 0 14px 22px;
  border-bottom: 1px solid var(--line);
  font: 400 15px/1.7 var(--sans);
  color: var(--graphite);
}

.page-contact .co-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 10px;
  height: 2px;
  background: var(--gold);
}

.page-contact .co-notes__foot {
  margin: 0;
  font: 400 14px/1.7 var(--sans);
  color: var(--rock);
}

.page-contact .co-notes__foot a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-contact .co-notes__foot a:hover,
.page-contact .co-notes__foot a:focus-visible {
  border-bottom-color: var(--moss);
}

.page-contact .co-console__aside {
  display: grid;
  gap: var(--gap);
}

.page-contact .co-card {
  padding: 24px 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-contact .co-card h3 {
  margin: 0 0 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font: 600 17px/1.4 var(--sans);
  color: var(--ink);
}

.page-contact .co-card--contact {
  background: var(--ink);
  border-color: var(--ink);
}

.page-contact .co-card--contact h3 {
  color: var(--paper);
  border-bottom-color: rgba(245, 242, 233, .22);
}

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

.page-contact .co-checklist li {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font: 400 15px/1.6 var(--sans);
  color: var(--graphite);
}

.page-contact .co-checklist li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-contact .co-checklist input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  position: relative;
}

.page-contact .co-checklist input[type="checkbox"]:checked {
  background: var(--moss);
  border-color: var(--moss);
}

.page-contact .co-checklist input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--paper);
  border-bottom: 2px solid var(--paper);
  transform: rotate(45deg);
}

.page-contact .co-checklist input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--vivid);
  outline-offset: 2px;
}

.page-contact .co-checklist label {
  cursor: pointer;
}

.page-contact .co-tag {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 6px;
  background: var(--gold);
  color: var(--ink);
  border-radius: var(--radius);
  font: 700 11px/1.3 var(--sans);
  letter-spacing: .06em;
  vertical-align: 1px;
}

.page-contact .contact-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.page-contact .contact-list li {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .contact-list li:last-child {
  border-bottom: 0;
}

.page-contact .contact-key {
  font: 700 12px/1 var(--sans);
  letter-spacing: .08em;
  color: var(--rock);
}

.page-contact .contact-val {
  font: 400 15px/1.6 var(--sans);
  color: var(--graphite);
  word-break: break-word;
}

.page-contact .co-card--contact .contact-list li {
  border-bottom-color: rgba(245, 242, 233, .18);
}

.page-contact .co-card--contact .contact-key {
  color: var(--gold);
}

.page-contact .co-card--contact .contact-val {
  color: var(--paper);
}

.page-contact .co-card__note {
  margin: 0;
  font: 400 13.5px/1.65 var(--sans);
  color: var(--rock);
}

.page-contact .co-card--contact .co-card__note {
  color: rgba(245, 242, 233, .72);
}

/* ---------- 常见咨询 ---------- */
.page-contact .co-faq {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-contact .co-faq dt {
  padding: 22px 0 8px;
  font: 600 17px/1.5 var(--sans);
  color: var(--ink);
}

.page-contact .co-faq dd {
  margin: 0;
  padding: 0 0 22px;
  border-bottom: 1px solid var(--line);
  max-width: 76ch;
  font: 400 15px/1.78 var(--sans);
  color: var(--graphite);
}

/* ---------- 结尾 ---------- */
.page-contact .co-cta {
  padding: clamp(48px, 7vw, 96px) 0 0;
}

.page-contact .co-cta__inner {
  padding: clamp(28px, 4.5vw, 56px);
  border: 1px solid var(--line);
  border-left: 4px solid var(--moss);
  background: var(--moss-bg);
  border-radius: var(--radius);
}

.page-contact .co-cta__inner h2 {
  margin-bottom: 12px;
}

.page-contact .co-cta__inner p {
  margin: 0;
  max-width: 60ch;
  font: 400 16px/1.75 var(--sans);
  color: var(--graphite);
}

.page-contact .co-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-contact .co-dir-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-contact .co-hero__frame {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
  }

  .page-contact .co-flow {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-contact .co-console {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-contact .co-console__aside {
    position: sticky;
    top: 88px;
  }
}

@media (min-width: 1060px) {
  .page-contact .co-dir-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 559px) {
  .page-contact .co-step__body {
    padding-left: 0;
  }

  .page-contact .co-path::before {
    display: none;
  }

  .page-contact .co-hero__stats .num {
    font-size: 22px;
  }

  .page-contact .co-cta__actions .btn,
  .page-contact .co-hero__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-step__node,
  .page-contact .co-step__mark::after {
    transition: none;
  }
}