.page-contact {
  --rail-radius: 6px;
  padding-block: clamp(26px, 4vw, 46px) clamp(60px, 9vw, 112px);
}

/* 面包屑 */
.page-contact .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 clamp(24px, 3vw, 40px);
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--slate);
}
.page-contact .breadcrumb a {
  color: var(--turquoise-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease);
}
.page-contact .breadcrumb a:hover { border-bottom-color: var(--turquoise-bright); }
.page-contact .breadcrumb li + li::before {
  content: "／";
  margin-right: 6px;
  color: var(--ink-45);
}

/* 双栏骨架 */
.page-contact .coop-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 56px);
}
.page-contact .coop-hero { grid-column: 1 / -1; max-width: 62rem; }
.page-contact .coop-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(52px, 6vw, 88px);
  min-width: 0;
}

/* 首屏 */
.page-contact .coop-hero h1 {
  margin: 14px 0 20px;
  font-size: clamp(32px, 5.2vw, 60px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-contact .coop-hero .lead { color: var(--ink-70); }

.page-contact .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 3vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--ink-12);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.page-contact .hero-facts li {
  background: var(--rock-white);
  padding: 16px 18px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-70);
}
.page-contact .hero-facts b {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--turquoise-deep);
}

/* 右侧询价卡 */
.page-contact .coop-rail { min-width: 0; }
.page-contact .rail-card {
  padding: clamp(24px, 3vw, 32px);
  background: var(--limestone);
  border: 1px solid var(--ink-06);
  border-top: 3px solid var(--gold);
  border-radius: var(--rail-radius);
  box-shadow: var(--shadow-float);
}
.page-contact .rail-card h2 {
  margin: 10px 0 0;
  font-size: clamp(20px, 2.4vw, 25px);
  line-height: 1.32;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-contact .rail-list {
  display: grid;
  gap: 12px;
  margin: 20px 0 24px;
  padding: 0;
  list-style: none;
}
.page-contact .rail-list li {
  display: flex;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-80);
}
.page-contact .rail-list li::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 8px;
  background: var(--amber);
  border-radius: 2px;
  transform: rotate(45deg);
}
.page-contact .rail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-contact .rail-note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ink-12);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}
.page-contact .rail-note a { color: var(--turquoise-deep); }

/* 区块公共 */
.page-contact .coop-section { min-width: 0; }
.page-contact .coop-section h2 {
  margin: 10px 0 16px;
  font-size: clamp(24px, 3.1vw, 34px);
  line-height: 1.26;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--ink);
}
.page-contact .coop-section > p { color: var(--ink-70); }
.page-contact .coop-section .muted { color: var(--slate); font-size: 14.5px; }
.page-contact .coop-section--limestone {
  padding: clamp(26px, 3.4vw, 42px);
  background: var(--limestone);
  border-radius: var(--radius-lg);
}
.page-contact .coop-section--limestone h3 {
  margin: 28px 0 12px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink);
}
.page-contact .coop-section a { color: var(--turquoise-deep); }

/* 图片框 */
.page-contact .media-frame {
  display: block;
  margin: 26px 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--ink-06);
}
.page-contact .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-contact .coop-figure { margin-top: clamp(26px, 3vw, 38px); }
.page-contact .coop-band { margin: 26px 0 24px; }

/* 四件事清单 */
.page-contact .ask-list {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-contact .ask-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 20px;
  background: var(--limestone);
  border-radius: 14px;
}
.page-contact .ask-index {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--tibetan-red);
}
.page-contact .ask-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.page-contact .ask-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-70);
}

/* 邮件结构草稿 */
.page-contact .mail-template { margin-top: 30px; }
.page-contact .mail-draft {
  margin: 12px 0 0;
  padding: 20px 22px;
  background: var(--ink);
  color: var(--light-88);
  border-radius: 12px;
  border-left: 3px solid var(--gold);
  font-size: 12.5px;
  line-height: 2;
  letter-spacing: .02em;
  white-space: pre-wrap;
  overflow-x: auto;
}

/* 大号邮箱 */
.page-contact .mail-big {
  margin: 22px 0 6px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--gold);
  font-size: clamp(19px, 3.6vw, 38px);
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.3;
  color: var(--turquoise-deep);
  word-break: break-all;
}

/* 联系信息三块 */
.page-contact .contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-contact .contact-block {
  padding: 22px 24px;
  border-radius: 14px;
}
.page-contact .contact-key {
  display: block;
  margin-bottom: 10px;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  opacity: .78;
}
.page-contact .contact-value {
  margin: 0;
  font-size: clamp(16px, 2.3vw, 22px);
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.4;
  word-break: break-word;
}
.page-contact .contact-block p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
}
.page-contact .contact-block--phone { background: var(--ink); color: var(--rock-white); }
.page-contact .contact-block--phone p { color: var(--light-80); }
.page-contact .contact-block--mail { background: var(--turquoise-deep); color: var(--rock-white); }
.page-contact .contact-block--mail p { color: var(--light-80); }
.page-contact .contact-block--addr { background: var(--limestone); color: var(--ink); }
.page-contact .contact-block--addr p { color: var(--ink-70); }

/* 伙伴合作清单 */
.page-contact .partner-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-contact .partner-list li {
  padding-left: 18px;
  border-left: 2px solid var(--gold);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-80);
}
.page-contact .partner-tag {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--turquoise-deep);
  color: var(--rock-white);
  font-size: 11.5px;
  letter-spacing: .06em;
}
.page-contact .partner-list--plain li {
  border-left-color: var(--turquoise-bright);
  color: var(--ink-70);
}

/* 时间线 */
.page-contact .flow-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}
.page-contact .flow-node {
  position: relative;
  padding-left: 44px;
  border-left: 1px solid var(--ink-12);
}
.page-contact .flow-node .node-index {
  position: absolute;
  left: -13px;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--rock-white);
  color: var(--gold);
  font-size: 11px;
  letter-spacing: 0;
}
.page-contact .flow-node.is-open .node-index {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--rock-white);
}
.page-contact .flow-node h3 {
  margin: 2px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.page-contact .flow-node p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-70);
}
.page-contact .node-time {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--ink-06);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--turquoise-deep);
}
.page-contact .flow-node.is-open .node-time {
  background: rgba(224, 122, 47, .16);
  color: var(--amber);
}

/* 折叠问答 */
.page-contact .fold-group { margin-top: 24px; }
.page-contact .fold { border-top: 1px solid var(--ink-12); }
.page-contact .fold:last-of-type { border-bottom: 1px solid var(--ink-12); }
.page-contact .fold summary {
  position: relative;
  padding: 18px 34px 18px 0;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}
.page-contact .fold summary::-webkit-details-marker { display: none; }
.page-contact .fold summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--turquoise-deep);
}
.page-contact .fold[open] summary::after { content: "–"; }
.page-contact .fold-body {
  padding: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-70);
}
.page-contact .fold-body p { margin: 0; }

/* 平板与桌面 */
@media (min-width: 640px) {
  .page-contact .hero-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-contact .contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-contact .contact-block--addr { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .page-contact .coop-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(40px, 5vw, 80px);
  }
  .page-contact .coop-hero { grid-column: 1 / -1; }
  .page-contact .coop-flow { grid-column: 1; grid-row: 2; }
  .page-contact .coop-rail {
    grid-column: 2;
    grid-row: 2;
    position: sticky;
    top: 112px;
  }
  .page-contact .flow-line {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }
  .page-contact .flow-node {
    padding: 36px 0 0;
    border-left: 0;
    border-top: 1px solid var(--ink-12);
  }
  .page-contact .flow-node .node-index {
    left: 0;
    top: -13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .breadcrumb a,
  .page-contact .media-frame img { transition: none; }
}