.page-contact {
  --coop-radius: var(--radius-l);
  --coop-sand-wash: rgba(217, 192, 138, 0.14);
  --coop-gap: 18px;
  display: block;
}

/* ---------- 面包屑与首屏 ---------- */
.page-contact .breadcrumbs {
  padding: 20px 0 4px;
}

.page-contact .coop-hero {
  padding: 12px 0 46px;
}

.page-contact .coop-hero__grid {
  display: grid;
  gap: 30px;
  align-items: center;
}

.page-contact .coop-hero__lead {
  max-width: 34em;
  margin: 18px 0 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.75;
}

.page-contact .coop-hero__facts {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
}

.page-contact .coop-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--mist);
  font-size: 13px;
}

.page-contact .coop-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-contact .coop-hero__frame {
  position: relative;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--coop-radius);
  background: linear-gradient(155deg, var(--deep) 0%, var(--ink) 78%);
  overflow: hidden;
}

.page-contact .coop-hero__frame::before,
.page-contact .coop-hero__frame::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.page-contact .coop-hero__frame::before {
  inset: 4px;
  border: 1px dashed var(--line-soft);
  border-radius: calc(var(--coop-radius) - 6px);
}

.page-contact .coop-hero__frame::after {
  left: 10px;
  right: 10px;
  bottom: 10px;
  height: 3px;
  background: linear-gradient(90deg, var(--mint) 0 28%, rgba(47, 227, 154, 0.25) 28% 62%, transparent 62%);
  border-radius: 0 0 calc(var(--coop-radius) - 10px) calc(var(--coop-radius) - 10px);
}

.page-contact .coop-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--coop-radius) - 9px);
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

/* ---------- 章节通用 ---------- */
.page-contact .section-head {
  margin-bottom: 28px;
}

.page-contact .section-title {
  margin: 10px 0 0;
  max-width: 22em;
}

.page-contact .section-note {
  margin: 10px 0 0;
  max-width: 40em;
}

/* ---------- 合作方向卡片 ---------- */
.page-contact .coop-grid {
  display: grid;
  gap: var(--coop-gap);
}

.page-contact .coop-card {
  position: relative;
  padding: 22px 22px 20px 26px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--deep);
  overflow: hidden;
  transition: background 0.28s ease, border-color 0.28s ease, transform 0.28s ease;
}

.page-contact .coop-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--rail, var(--mint));
}

.page-contact .coop-card--mint { --rail: var(--mint); }
.page-contact .coop-card--aqua { --rail: var(--aqua); }
.page-contact .coop-card--amber { --rail: var(--amber); }
.page-contact .coop-card--sand { --rail: var(--sand); }

.page-contact .coop-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-contact .coop-card__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-contact .coop-card__title {
  margin: 16px 0 0;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

.page-contact .coop-card__body {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .coop-card__fit {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-size: 13px;
  line-height: 1.6;
  color: var(--aqua);
}

.page-contact .coop-card__fit span {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border-radius: var(--pill);
  background: var(--mint-soft);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

/* ---------- 接口与内容 ---------- */
.page-contact .coop-interface__grid {
  display: grid;
  gap: 28px;
}

.page-contact .coop-interface .prose {
  margin: 16px 0 0;
}

.page-contact .coop-interface .prose + .prose {
  margin-top: 14px;
}

.page-contact .coop-spec {
  padding: 24px 22px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
}

.page-contact .coop-spec__title {
  margin: 0 0 16px;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--aqua);
  font-family: var(--font-mono);
}

.page-contact .coop-spec__list {
  margin: 0;
  padding: 0;
}

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

.page-contact .coop-spec__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-contact .coop-spec__row dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  font-family: var(--font-mono);
}

.page-contact .coop-spec__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
}

.page-contact .coop-mono {
  font-family: var(--font-mono);
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

/* ---------- 合作流程 ---------- */
.page-contact .coop-flow__grid {
  display: grid;
  gap: 28px;
}

.page-contact .coop-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .coop-step {
  position: relative;
  padding: 20px 20px 20px 68px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--panel);
  transition: border-color 0.3s ease, background 0.3s ease;
}

.page-contact .coop-step + .coop-step::before {
  content: "";
  position: absolute;
  left: 34px;
  top: -14px;
  width: 1px;
  height: 14px;
  background: var(--line);
}

.page-contact .coop-step__num {
  position: absolute;
  left: 16px;
  top: 20px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: var(--pill);
  background: var(--mint-soft);
  border: 1px solid rgba(47, 227, 154, 0.38);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.page-contact .coop-step__title {
  margin: 0;
  font-size: 17px;
  line-height: 1.45;
  color: var(--paper);
}

.page-contact .coop-step p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--mist);
}

.page-contact .coop-step__time {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 10px;
  border-radius: var(--pill);
  border: 1px solid rgba(255, 154, 60, 0.34);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

.page-contact .coop-flow__figure {
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--deep);
}

.page-contact .coop-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .coop-flow__figure .media-caption {
  display: block;
  margin: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--line-soft);
  color: var(--mist);
  font-size: 12.5px;
  line-height: 1.6;
}

/* ---------- 合作生态 ---------- */
.page-contact .coop-track__grid {
  display: grid;
  gap: 16px;
}

.page-contact .coop-track__panel {
  display: grid;
  gap: 14px;
  padding: 24px 22px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--mint);
}

.page-contact .coop-track__panel--amber {
  border-left-color: var(--amber);
}

.page-contact .coop-track__body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 准备材料 ---------- */
.page-contact .coop-materials__grid {
  display: grid;
  gap: 14px;
}

.page-contact .coop-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-contact .coop-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  border-radius: var(--radius-s);
  border: 1px solid var(--line-soft);
  background: var(--deep);
  font-size: 14.5px;
  line-height: 1.62;
  color: var(--paper);
}

.page-contact .coop-check {
  flex: none;
  width: 24px;
  height: 24px;
  margin-top: 1px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: var(--aqua);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
}

/* ---------- 联系卡 ---------- */
.page-contact .coop-contact {
  padding-bottom: 64px;
}

.page-contact .coop-contact__card {
  position: relative;
  padding: 30px 22px 28px;
  border-radius: var(--coop-radius);
  background: var(--sand);
  border: 1px solid rgba(10, 18, 16, 0.2);
  color: var(--ink);
  overflow: hidden;
}

.page-contact .coop-contact__card::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 1px dashed rgba(10, 18, 16, 0.2);
  pointer-events: none;
}

.page-contact .coop-contact__card .section-kicker {
  color: rgba(10, 18, 16, 0.6);
}

.page-contact .coop-contact__card .section-title {
  color: var(--ink);
  max-width: 18em;
}

.page-contact .coop-contact__lead {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(10, 18, 16, 0.82);
}

.page-contact .coop-contact__rows {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-contact .coop-contact__rows .contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  padding: 14px 16px;
  border-radius: var(--radius-s);
  background: rgba(10, 18, 16, 0.78);
  border: 1px solid rgba(10, 18, 16, 0.24);
}

.page-contact .coop-contact__rows .contact-label {
  flex: none;
  min-width: 5.5em;
  color: var(--mist);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  font-family: var(--font-mono);
}

.page-contact .coop-contact__rows .contact-value {
  font-family: var(--font-mono);
  font-size: 16.5px;
  color: var(--mint);
  letter-spacing: 0.01em;
  word-break: break-word;
  font-variant-numeric: tabular-nums;
}

.page-contact .coop-contact__card .contact-note {
  margin: 18px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: rgba(10, 18, 16, 0.7);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .coop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .coop-track__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .coop-materials__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-contact .coop-contact__card {
    padding: 38px 34px 34px;
  }
}

@media (min-width: 960px) {
  .page-contact .coop-hero {
    padding: 20px 0 64px;
  }

  .page-contact .coop-hero__grid {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 46px;
  }

  .page-contact .coop-interface__grid {
    grid-template-columns: 1.6fr 1fr;
    gap: 44px;
    align-items: start;
  }

  .page-contact .coop-flow__grid {
    grid-template-columns: 1.28fr 0.72fr;
    gap: 42px;
    align-items: start;
  }

  .page-contact .coop-flow__figure {
    position: sticky;
    top: 96px;
  }

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

  .page-contact .coop-step {
    padding: 22px 24px 22px 72px;
  }
}

/* 悬停展开适用对象：仅在支持悬停的宽屏生效 */
@media (hover: hover) and (min-width: 720px) {
  .page-contact .coop-card__fit {
    margin-top: 0;
    padding-top: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s ease, opacity 0.32s ease, margin-top 0.32s ease,
      padding-top 0.32s ease;
  }

  .page-contact .coop-card:hover,
  .page-contact .coop-card:focus-within {
    background: var(--panel);
    border-color: var(--line);
    transform: translateY(-2px);
  }

  .page-contact .coop-card:hover .coop-card__fit,
  .page-contact .coop-card:focus-within .coop-card__fit {
    margin-top: 16px;
    padding-top: 12px;
    max-height: 10rem;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .coop-card,
  .page-contact .coop-step,
  .page-contact .coop-card__fit {
    transition: none;
  }

  .page-contact .coop-card:hover,
  .page-contact .coop-card:focus-within {
    transform: none;
  }
}