.page-contact {
  --co-gap: clamp(16px, 2.4vw, 28px);
  --co-paper-ink: #101720;
  --co-paper-ink-2: #454E59;
  --co-paper-ink-3: #6C7580;
  --co-paper-rule: #C9C0B0;
}

.page-contact .breadcrumb {
  margin-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  display: grid;
  gap: clamp(22px, 3.2vw, 40px);
  padding: clamp(20px, 3.4vw, 40px) 0 clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line-soft);
}

.page-contact .co-hero__lead .eyebrow {
  margin: 0 0 10px;
}

.page-contact .co-hero__lead .display-title {
  margin: 0 0 16px;
  max-width: 18ch;
}

.page-contact .co-hero__lead .lede {
  margin: 0;
  max-width: 46ch;
  color: var(--text-2);
}

.page-contact .co-hero__aside {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan-spark-400);
  padding: 16px 16px 14px;
}

.page-contact .co-hero__aside-title {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-contact .co-quick {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-contact .co-quick__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 11px;
  background: var(--bg-3);
  border: 1px solid var(--line-soft);
  color: var(--text);
  text-decoration: none;
  font-size: 0.94rem;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-contact .co-quick__link:hover,
.page-contact .co-quick__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--silver-300);
}

.page-contact .co-quick__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--cyan-spark-400);
}

/* ---------- 双栏骨架 ---------- */
.page-contact .co-layout {
  display: grid;
  gap: clamp(22px, 3.2vw, 44px);
  padding: clamp(28px, 4.4vw, 56px) 0 clamp(40px, 6vw, 84px);
}

.page-contact .co-index-title {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-contact .co-flow {
  display: grid;
  gap: clamp(42px, 5.6vw, 78px);
  min-width: 0;
}

.page-contact .co-block {
  min-width: 0;
}

.page-contact .co-block__note {
  margin: 6px 0 20px;
  max-width: 42ch;
  color: var(--text-2);
  line-height: 1.75;
}

.page-contact .co-figure {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

/* ---------- 合作方向错位卡片 ---------- */
.page-contact .co-dirs {
  display: grid;
  gap: var(--co-gap);
}

.page-contact .co-dir {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--moss-600);
  padding: clamp(16px, 2.2vw, 24px);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-contact .co-dir--b { border-left-color: var(--clay-500); }
.page-contact .co-dir--c { border-left-color: var(--cyan-spark-400); }

.page-contact .co-dir:hover,
.page-contact .co-dir:focus-within {
  transform: translateY(-2px);
  border-color: var(--silver-300);
}

.page-contact .co-dir__tag {
  margin: 0 0 8px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-contact .co-dir--a .co-dir__tag { color: var(--moss-ink); }
.page-contact .co-dir--b .co-dir__tag { color: var(--clay-ink); }
.page-contact .co-dir--c .co-dir__tag { color: var(--cyan-ink); }

.page-contact .co-dir__title {
  margin: 0 0 10px;
  font-size: clamp(1.08rem, 2vw, 1.32rem);
  font-weight: 600;
  color: var(--text);
}

.page-contact .co-dir__body {
  margin: 0;
  color: var(--text-2);
  line-height: 1.75;
  font-size: 0.96rem;
}

.page-contact .co-dir__detail {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  overflow: hidden;
}

.page-contact .co-dir__detail-title {
  margin: 0 0 8px;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-contact .co-dir__list {
  margin: 0;
  padding: 0 0 0 16px;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-contact .co-dir__list li + li {
  margin-top: 4px;
}

/* ---------- 流程节点条 ---------- */
.page-contact .co-flowline {
  display: grid;
  gap: 12px;
}

.page-contact .co-node {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--slate-600);
  padding: 0;
}

.page-contact .co-node:last-child {
  border-top-color: var(--amber-400);
}

.page-contact .co-node[open] {
  border-top-color: var(--cyan-spark-400);
}

.page-contact .co-node:last-child[open] {
  border-top-color: var(--amber-400);
}

.page-contact .co-node__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
}

.page-contact .co-node__summary::-webkit-details-marker {
  display: none;
}

.page-contact .co-node__num {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--text-3);
  flex: none;
}

.page-contact .co-node__name {
  font-weight: 600;
  color: var(--text);
  font-size: 0.98rem;
}

.page-contact .co-node__body {
  padding: 0 14px 14px;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.72;
}

.page-contact .co-node__body p {
  margin: 0 0 8px;
}

.page-contact .co-node__output {
  display: inline-block;
  padding: 5px 9px;
  background: var(--bg-3);
  border: 1px solid var(--line-soft);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

/* ---------- 内容共建三列 ---------- */
.page-contact .co-cols {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: 4px;
}

.page-contact .co-col {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-contact .co-col__title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.page-contact .co-col p {
  margin: 0;
  color: var(--text-2);
  line-height: 1.75;
  font-size: 0.94rem;
}

.page-contact .co-btn-row {
  margin-top: 22px;
}

/* ---------- 联系方式（纸面区块） ---------- */
.page-contact .co-contact {
  background: var(--paper-50);
  color: var(--co-paper-ink);
  border: 1px solid var(--paper-50);
  padding: clamp(20px, 3.4vw, 40px);
  box-shadow: var(--shadow);
}

.page-contact .co-contact__eyebrow {
  margin: 0 0 10px;
  color: var(--co-paper-ink-3);
}

.page-contact .co-contact__title {
  margin: 0 0 12px;
  font-size: clamp(1.24rem, 2.6vw, 1.7rem);
  font-weight: 700;
  color: var(--co-paper-ink);
  letter-spacing: 0.02em;
}

.page-contact .co-contact__lede {
  margin: 0 0 22px;
  max-width: 44ch;
  color: var(--co-paper-ink-2);
  line-height: 1.75;
}

.page-contact .co-fields {
  margin: 0;
  border-top: 1px solid var(--co-paper-rule);
}

.page-contact .co-field {
  display: grid;
  gap: 2px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--co-paper-rule);
}

.page-contact .co-field__key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--co-paper-ink-3);
}

.page-contact .co-field__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 1.9vw, 1.12rem);
  color: var(--co-paper-ink);
  word-break: break-word;
}

.page-contact .co-contact__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--moss-600);
  color: var(--co-paper-ink-2);
  font-size: 0.92rem;
  line-height: 1.75;
}

/* ---------- 准备材料清单 ---------- */
.page-contact .co-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .co-checklist__item {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 12px;
  align-items: start;
  padding: 13px 15px;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-contact .co-checklist__item:hover {
  border-color: var(--moss-600);
  transform: translateY(-2px);
}

.page-contact .co-checklist__box {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  border: 1px solid var(--silver-300);
  background: var(--bg-3);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-contact .co-checklist__item:hover .co-checklist__box {
  background: var(--moss-600);
  border-color: var(--moss-600);
}

.page-contact .co-checklist__text {
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.72;
}

.page-contact .co-checklist__text strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 服务范围与响应 ---------- */
.page-contact .co-scope {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 3.6vw, 36px);
}

.page-contact .co-scope__cell {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--clay-500);
  padding: 16px 16px 14px;
}

.page-contact .co-scope__label {
  margin: 0 0 8px;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-contact .co-scope__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--text);
}

.page-contact .co-scope__desc {
  margin: 8px 0 0;
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.65;
}

.page-contact .co-rhythm {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-contact .co-rhythm__title {
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.page-contact .co-rhythm__list {
  margin: 0;
  padding: 0 0 0 18px;
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.75;
}

.page-contact .co-rhythm__list li + li {
  margin-top: 6px;
}

.page-contact .co-rhythm__link {
  margin: 16px 0 0;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.75;
}

/* ---------- 桌面端布局 ---------- */
@media (min-width: 720px) {
  .page-contact .co-flowline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .co-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .co-scope {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero {
    grid-template-columns: minmax(0, 7fr) minmax(250px, 4fr);
    align-items: end;
  }

  .page-contact .co-layout {
    grid-template-columns: minmax(190px, 4fr) minmax(0, 8fr);
  }

  .page-contact .co-field {
    grid-template-columns: 128px 1fr;
    align-items: baseline;
  }

  .page-contact .co-field__key {
    text-align: right;
  }

  .page-contact .co-flowline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    position: relative;
  }

  .page-contact .co-flowline::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: repeating-linear-gradient(90deg, var(--line) 0 6px, transparent 6px 13px);
  }

  .page-contact .co-node {
    border-top-width: 2px;
    margin-right: -1px;
  }
}

@media (min-width: 1040px) {
  .page-contact .co-dirs {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: start;
  }

  .page-contact .co-dir--a {
    grid-column: 1 / span 3;
  }

  .page-contact .co-dir--b {
    grid-column: 4 / span 3;
    margin-top: 34px;
  }

  .page-contact .co-dir--c {
    grid-column: 2 / span 4;
    margin-top: 4px;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-contact .co-dir__detail {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-width: 0;
    transition: max-height 260ms var(--ease), opacity 200ms var(--ease), margin-top 200ms var(--ease), padding-top 200ms var(--ease);
  }

  .page-contact .co-dir:hover .co-dir__detail,
  .page-contact .co-dir:focus-within .co-dir__detail {
    max-height: 340px;
    opacity: 1;
    margin-top: 14px;
    padding-top: 14px;
    border-top-width: 1px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-quick__link,
  .page-contact .co-dir,
  .page-contact .co-checklist__item,
  .page-contact .co-checklist__box,
  .page-contact .co-dir__detail {
    transition: none;
  }

  .page-contact .co-quick__link:hover,
  .page-contact .co-dir:hover,
  .page-contact .co-checklist__item:hover {
    transform: none;
  }
}