/* ================= 联系与合作 · 页面专属样式 ================= */
.page-contact {
  --pc-rule: var(--ink-200);
  --pc-soft: rgba(30, 75, 224, 0.12);
  --pc-pad-y: 64px;
  display: block;
}

/* ---------- 面包屑留白 ---------- */
.page-contact .breadcrumb {
  padding-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-contact .pc-intro {
  max-width: 840px;
  padding: 34px 0 62px;
}

.page-contact .pc-intro__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-contact .pc-intro__eyebrow::before {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--cyan);
  flex: none;
}

.page-contact .pc-intro__title {
  margin: 0 0 22px;
  font-size: clamp(29px, 7.4vw, 52px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
}

.page-contact .pc-intro__lead {
  margin: 0 0 30px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 62ch;
}

.page-contact .pc-intro__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--pc-rule);
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-contact .pc-intro__facts li {
  display: inline-flex;
  align-items: center;
}

.page-contact .pc-intro__facts li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--lime);
  margin-right: 9px;
  flex: none;
}

/* ---------- 章节骨架 ---------- */
.page-contact .pc-chapter {
  padding: var(--pc-pad-y) 0;
}

.page-contact .pc-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 36px;
}

.page-contact .pc-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cobalt-lit);
  padding-top: 4px;
}

.page-contact .pc-chapter__title {
  margin: 0;
  font-size: clamp(21px, 4.4vw, 32px);
  line-height: 1.32;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--text);
}

/* ---------- 图表容器 ---------- */
.page-contact .pc-media {
  margin: 0;
  border: 1px solid var(--pc-rule);
  background: var(--ink-100);
  overflow: hidden;
}

.page-contact .pc-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .pc-media--wide img {
  aspect-ratio: 3 / 2;
}

.page-contact .pc-media--square img {
  aspect-ratio: 1 / 1;
}

/* ---------- 正文链接 ---------- */
.page-contact .pc-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 179, 168, 0.4);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-contact .pc-inline-link:hover,
.page-contact .pc-inline-link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--cyan);
}

/* ---------- 01 求助通道 ---------- */
.page-contact .pc-help__grid {
  display: grid;
  gap: 34px;
}

.page-contact .pc-help__lead {
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 60ch;
}

.page-contact .pc-channels {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  border-top: 1px solid var(--pc-rule);
}

.page-contact .pc-channels__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--pc-rule);
}

.page-contact .pc-channels__key {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.page-contact .pc-channels__value {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--text);
  word-break: break-word;
}

.page-contact .pc-channels__value--mail {
  color: var(--cyan);
}

.page-contact .pc-help__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 60ch;
}

.page-contact .pc-help__figure {
  margin: 0;
}

/* ---------- 02 合作方向 ---------- */
.page-contact .pc-coop__grid {
  display: grid;
  gap: 40px;
}

.page-contact .pc-coop__aside {
  display: grid;
  gap: 20px;
}

.page-contact .pc-coop__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 40ch;
}

.page-contact .pc-tracknav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
}

.page-contact .pc-tracknav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 15px;
  border: 1px solid var(--pc-rule);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-contact .pc-tracknav a:hover,
.page-contact .pc-tracknav a:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
}

.page-contact .pc-tracks {
  display: grid;
  gap: 0;
}

.page-contact .pc-track {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 2px 16px;
  padding: 26px 0;
  border-top: 1px solid var(--pc-rule);
  transition: background-color 200ms var(--ease), padding 200ms var(--ease);
}

.page-contact .pc-track:last-child {
  border-bottom: 1px solid var(--pc-rule);
}

.page-contact .pc-track:target {
  background: var(--pc-soft);
  box-shadow: inset 3px 0 0 var(--cobalt-lit);
  padding-left: 18px;
  padding-right: 14px;
}

.page-contact .pc-track__num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--cobalt-lit);
}

.page-contact .pc-track__body {
  min-width: 0;
}

.page-contact .pc-track__name {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-contact .pc-track__desc {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 62ch;
}

.page-contact .pc-track__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-contact .pc-track__meta span {
  position: relative;
  padding-left: 14px;
}

.page-contact .pc-track__meta span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  background: var(--orange);
}

/* ---------- 03 材料清单 ---------- */
.page-contact .pc-lists {
  display: grid;
  gap: 38px;
}

.page-contact .pc-list__title {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
}

.page-contact .pc-list__hint {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 52ch;
}

.page-contact .pc-list__items {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--pc-rule);
}

.page-contact .pc-list__items li {
  position: relative;
  padding: 13px 0 13px 26px;
  border-bottom: 1px solid var(--pc-rule);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-contact .pc-list__items li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--cyan);
}

/* ---------- 04 地址与备案 ---------- */
.page-contact .pc-registry__strip {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--pc-rule);
}

.page-contact .pc-registry__cell {
  padding: 20px 0;
  border-bottom: 1px solid var(--pc-rule);
}

.page-contact .pc-registry__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-contact .pc-registry__value {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  word-break: break-word;
}

.page-contact .pc-registry__value--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 收尾 ---------- */
.page-contact .pc-outro {
  padding: 58px 0 72px;
}

.page-contact .pc-outro__text {
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 66ch;
}

.page-contact .pc-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .pc-outro__actions .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact {
    --pc-pad-y: 76px;
  }

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

  .page-contact .pc-registry__cell {
    border-bottom: none;
    border-top: 1px solid var(--pc-rule);
    padding: 22px 24px 22px 0;
  }

  .page-contact .pc-registry__cell + .pc-registry__cell {
    padding-left: 24px;
    border-left: 1px solid var(--pc-rule);
  }
}

@media (min-width: 860px) {
  .page-contact .pc-help__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.88fr);
    gap: 52px;
    align-items: start;
  }

  .page-contact .pc-lists {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 56px;
  }

  .page-contact .pc-coop__grid {
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-contact .pc-coop__aside {
    position: sticky;
    top: 78px;
  }
}

@media (min-width: 1120px) {
  .page-contact .pc-chapter__head {
    gap: 22px;
    margin-bottom: 44px;
  }

  .page-contact .pc-track {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 30px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .pc-track,
  .page-contact .pc-inline-link,
  .page-contact .pc-tracknav a {
    transition: none;
  }
}
</main>