.page-contact {
  --co-line-soft: rgba(31, 59, 52, .72);
  --co-glow-soft: rgba(61, 242, 192, .16);
  --co-amber-soft: rgba(240, 180, 41, .18);
  background: var(--c-night);
  color: var(--c-mist);
  padding-top: var(--header-h);
  overflow-x: hidden;
}

.page-contact h1,
.page-contact h2,
.page-contact h3 {
  font-family: var(--ff-sans);
  font-weight: 800;
  letter-spacing: var(--ls-wide);
  color: var(--c-paper);
}

.page-contact h1 {
  margin: 18px 0 0;
  font-size: clamp(28px, 7vw, var(--fs-2xl));
  line-height: var(--lh-tight);
}

.page-contact h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 4.6vw, var(--fs-xl));
  line-height: var(--lh-tight);
}

.page-contact h3 {
  margin: 8px 0 10px;
  font-size: var(--fs-md);
  line-height: var(--lh-snug);
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  position: relative;
  padding: 22px 0 48px;
  overflow: hidden;
}

.page-contact .co-hero::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  top: -180px;
  height: 560px;
  background:
    radial-gradient(58% 78% at 16% 26%, var(--co-glow-soft), transparent 70%),
    radial-gradient(48% 66% at 84% 4%, var(--co-amber-soft), transparent 72%);
  pointer-events: none;
}

.page-contact .co-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  padding-top: 26px;
}

.page-contact .co-hero__intro {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

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

.page-contact .co-hero__facts {
  position: relative;
  padding: 22px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(17, 20, 23, .94), rgba(14, 39, 33, .74));
  box-shadow: inset 0 1px 0 rgba(140, 246, 220, .08);
}

.page-contact .co-hero__facts::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -1px;
  width: 34px;
  height: 3px;
  background: var(--c-neon);
}

.page-contact .co-facts__title {
  margin: 0 0 16px;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wider);
  color: var(--c-amber);
}

.page-contact .co-facts {
  display: grid;
  gap: 11px;
  margin: 0;
}

.page-contact .co-facts__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--co-line-soft);
}

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

.page-contact .co-facts__row dt {
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wide);
  color: var(--c-mist-dim);
}

.page-contact .co-facts__row dd {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--c-paper);
  overflow-wrap: anywhere;
}

.page-contact .co-facts__note {
  margin: 16px 0 0;
  font-size: var(--fs-xs);
  line-height: var(--lh-body);
  color: var(--c-mist-dim);
}

/* ---------- 通用章节 ---------- */
.page-contact .co-section {
  position: relative;
  padding: 56px 0;
}

.page-contact .section-head {
  max-width: 46em;
  margin-bottom: 26px;
}

.page-contact .co-lede {
  margin: 14px 0 0;
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-contact .co-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-contact .co-list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-contact .co-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 1px;
  background: var(--c-neon);
}

.page-contact .co-figure {
  margin: 32px 0 0;
}

/* ---------- 合作类型 ---------- */
.page-contact .co-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 24px;
}

.page-contact .co-tabs a {
  padding: 9px 16px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-family: var(--ff-mono);
  font-size: var(--fs-sm);
  letter-spacing: var(--ls-wide);
  color: var(--c-mist);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-contact .co-tabs a:hover,
.page-contact .co-tabs a:focus-visible {
  color: var(--c-neon);
  border-color: var(--c-neon);
  box-shadow: 0 0 0 1px rgba(61, 242, 192, .32);
}

.page-contact .co-cards {
  display: grid;
  gap: 18px;
}

.page-contact .co-card {
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(17, 20, 23, .96), rgba(8, 19, 15, .94));
  scroll-margin-top: calc(var(--header-h) + 18px);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-contact .co-card::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-neon), rgba(61, 242, 192, 0));
}

.page-contact .co-card:target {
  border-color: var(--c-neon);
  box-shadow: 0 0 0 1px rgba(61, 242, 192, .3), 0 22px 46px -30px rgba(61, 242, 192, .75);
}

.page-contact .co-card__for {
  margin: 0 0 16px;
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  color: var(--c-mist-dim);
}

/* ---------- 流程 ---------- */
.page-contact .co-steps {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-contact .co-steps details {
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: rgba(17, 20, 23, .74);
}

.page-contact .co-steps details[open] {
  border-color: rgba(61, 242, 192, .42);
  background: rgba(14, 39, 33, .6);
}

.page-contact .co-steps summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 20px;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-md);
  letter-spacing: var(--ls-wide);
  color: var(--c-paper);
}

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

.page-contact .co-steps summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--ff-mono);
  font-size: var(--fs-base);
  color: var(--c-neon);
}

.page-contact .co-steps details[open] summary::after {
  content: "–";
}

.page-contact .co-step-num {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wider);
  color: var(--c-amber);
}

.page-contact .co-step__body {
  padding: 0 20px 18px 54px;
}

.page-contact .co-step__body p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

/* ---------- 共建要求 ---------- */
.page-contact .co-split {
  display: grid;
  gap: 20px;
}

.page-contact .co-split__body p {
  margin: 0 0 18px;
  color: var(--c-mist);
}

.page-contact .co-req {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: 0 0 18px;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--c-line);
}

.page-contact .co-req li {
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-contact .co-req strong {
  color: var(--c-paper);
  letter-spacing: var(--ls-wide);
}

/* ---------- 渠道协作 ---------- */
.page-contact .co-channel-grid {
  display: grid;
  gap: 18px;
}

.page-contact .co-channel {
  padding: 22px 20px 24px;
  border-top: 2px solid var(--c-line);
  background: linear-gradient(180deg, rgba(14, 39, 33, .52), rgba(8, 19, 15, 0));
  transition: border-color .3s var(--ease);
}

.page-contact .co-channel:hover {
  border-top-color: var(--c-amber);
}

.page-contact .co-channel p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

/* ---------- 客服支持范围 ---------- */
.page-contact .co-support-grid {
  display: grid;
  gap: 18px;
}

.page-contact .co-support {
  padding: 22px 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: rgba(17, 20, 23, .78);
}

.page-contact .co-support__hint {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--co-line-soft);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  line-height: var(--lh-body);
  color: var(--c-glow);
}

.page-contact .co-support__more {
  margin: 26px 0 0;
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-contact .prose a,
.page-contact .co-support__more a {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 192, .45);
}

/* ---------- 联系方式 ---------- */
.page-contact .co-contact-plate {
  position: relative;
  padding: 24px 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: linear-gradient(155deg, rgba(17, 20, 23, .96), rgba(14, 39, 33, .68));
  box-shadow: inset 0 1px 0 rgba(140, 246, 220, .08);
}

.page-contact .co-contact-plate::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed rgba(31, 59, 52, .82);
  border-radius: 3px;
  pointer-events: none;
}

.page-contact .co-contact-list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-contact .co-contact-row {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--co-line-soft);
}

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

.page-contact .co-contact-row dt {
  font-size: var(--fs-xs);
  letter-spacing: var(--ls-wide);
  color: var(--c-amber);
}

.page-contact .co-contact-row dd {
  margin: 0;
  font-size: var(--fs-base);
  color: var(--c-paper);
  overflow-wrap: anywhere;
}

.page-contact .co-contact-note {
  position: relative;
  z-index: 1;
  margin: 20px 0 0;
  font-size: var(--fs-xs);
  line-height: var(--lh-body);
  color: var(--c-mist-dim);
}

.page-contact .co-checklist {
  margin-top: 28px;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--c-amber);
}

.page-contact .co-checklist h3 {
  margin: 0 0 14px;
  font-size: var(--fs-base);
}

.page-contact .co-checklist ul {
  list-style: none;
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
}

.page-contact .co-checklist li {
  position: relative;
  padding-left: 26px;
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  color: var(--c-mist);
}

.page-contact .co-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .42em;
  width: 12px;
  height: 12px;
  border: 1px solid var(--c-amber);
  border-radius: 2px;
}

/* ---------- 回复节奏 ---------- */
.page-contact .co-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact .co-cards,
  .page-contact .co-channel-grid,
  .page-contact .co-support-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero {
    padding: 30px 0 68px;
  }

  .page-contact .co-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, .85fr);
    gap: 52px;
    align-items: end;
    padding-top: 40px;
  }

  .page-contact .co-section {
    padding: 88px 0;
  }

  .page-contact .section-head {
    margin-bottom: 34px;
  }

  .page-contact .co-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
  }

  .page-contact .co-card:nth-child(2) {
    margin-top: 34px;
  }

  .page-contact .co-card:nth-child(3) {
    margin-top: 68px;
  }

  .page-contact .co-channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-contact .co-support-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }

  .page-contact .co-split {
    grid-template-columns: minmax(220px, .72fr) minmax(0, 1.6fr);
    gap: 54px;
    align-items: start;
  }

  .page-contact .co-split__head {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-contact .co-contact-plate {
    padding: 32px 32px 28px;
  }

  .page-contact .co-contact-row {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-tabs a,
  .page-contact .co-card,
  .page-contact .co-channel {
    transition: none;
  }
}