.page-contact {
  --pc-gap: clamp(20px, 3vw, 34px);
  --pc-pad: clamp(18px, 2.4vw, 28px);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: clamp(36px, 5vw, 76px);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(118deg, rgba(198, 255, 61, 0.13) 0%, rgba(198, 255, 61, 0) 42%),
    linear-gradient(298deg, rgba(255, 138, 43, 0.14) 0%, rgba(255, 138, 43, 0) 38%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -8%;
  top: 8%;
  width: clamp(200px, 33vw, 500px);
  height: clamp(160px, 25vw, 340px);
  pointer-events: none;
  background: linear-gradient(135deg, rgba(18, 49, 79, 0.92), rgba(8, 24, 42, 0.18));
  border: 2px solid var(--stroke);
  transform: rotate(-9deg);
}

.page-contact .contact-hero-inner {
  position: relative;
  z-index: 1;
}

.page-contact .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-contact .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-contact .breadcrumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-contact .breadcrumb-sep {
  color: var(--stroke-2);
}

.page-contact .contact-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.04;
  font-size: clamp(2.3rem, 6.4vw, 4.8rem);
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  max-width: 16ch;
}

.page-contact .hero-hl {
  color: var(--lime);
  position: relative;
  white-space: nowrap;
}

.page-contact .hero-hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 0.14em;
  background: var(--orange);
  opacity: 0.5;
}

.page-contact .contact-hero .lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.8;
  color: var(--text);
}

.page-contact .contact-hero .lede + .hero-facts {
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-contact .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
}

.page-contact .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding-left: 13px;
  border-left: 2px solid var(--stroke);
  font-size: 0.92rem;
  color: var(--muted);
}

.page-contact .hero-facts .mono {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--lime);
  line-height: 1;
}

/* ---------- 通用小节头 ---------- */
.page-contact .sec-head {
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.page-contact .sec-head h2 {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.005em;
  line-height: 1.12;
  font-size: clamp(1.7rem, 3.6vw, 2.9rem);
  margin: 10px 0 0;
  max-width: 22ch;
}

.page-contact .sec-sub {
  margin: 12px 0 0;
  max-width: 58ch;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.78;
}

/* ---------- 联系方式总览 ---------- */
.page-contact .channel-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
}

.page-contact .channel-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
}

.page-contact .channel-card {
  position: relative;
  padding: var(--pc-pad);
  border-top: 4px solid var(--lime);
}

.page-contact .channel-card:nth-child(2) {
  border-top-color: var(--orange);
}

.page-contact .channel-card:nth-child(3) {
  border-top-color: var(--stroke-2);
}

.page-contact .channel-index {
  position: absolute;
  top: var(--pc-pad);
  right: var(--pc-pad);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.page-contact .channel-card h3 {
  font-family: var(--font-head);
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0;
  color: var(--text);
}

.page-contact .channel-value {
  display: block;
  margin: 12px 0 14px;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(1.02rem, 2.2vw, 1.42rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--lime);
  text-decoration: none;
  word-break: break-word;
  border-bottom: 2px dashed rgba(198, 255, 61, 0.34);
  transition: color var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-contact a.channel-value:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
  border-bottom-style: solid;
}

.page-contact .channel-value--text {
  color: var(--text);
  border-bottom-color: var(--stroke);
  font-size: clamp(0.98rem, 1.9vw, 1.18rem);
  line-height: 1.6;
}

.page-contact .channel-desc {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-contact .channel-figure {
  margin: 0;
}

.page-contact .channel-figure .figure-frame {
  position: relative;
  border: 2px solid var(--stroke);
  background: var(--navy-900);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.page-contact .channel-figure .figure-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(62, 92, 107, 0.28) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg, rgba(62, 92, 107, 0.28) 0 1px, transparent 1px 46px);
}

.page-contact .channel-figure img,
.page-contact .prepare-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-contact .channel-figure .figure-caption,
.page-contact .prepare-figure .figure-caption {
  display: block;
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

/* ---------- 四类请求 ---------- */
.page-contact .topic-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
}

.page-contact .topic-item {
  position: relative;
  padding: var(--pc-pad);
  background: var(--ink-800);
  border: 2px solid var(--stroke);
  border-top: 4px solid var(--lime);
}

.page-contact .topic-item:nth-child(even) {
  border-top-color: var(--orange);
  background: var(--navy-900);
}

.page-contact .topic-mark {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--ink-900);
  background: var(--lime);
  padding: 3px 9px;
  margin-bottom: 14px;
}

.page-contact .topic-item:nth-child(even) .topic-mark {
  background: var(--orange);
}

.page-contact .topic-item h3 {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--text);
}

.page-contact .topic-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-contact .topic-item a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 2px solid rgba(198, 255, 61, 0.34);
  transition: color var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-contact .topic-item a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-contact .topic-note {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 2px solid var(--stroke);
  font-family: var(--font-mono);
  font-size: 0.8rem !important;
  color: var(--lime) !important;
  letter-spacing: 0.01em;
}

.page-contact .topic-item:nth-child(even) .topic-note {
  color: var(--orange) !important;
}

/* ---------- 准备清单 ---------- */
.page-contact .prepare-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
}

.page-contact .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-contact .check-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 18px;
  background: var(--ink-800);
  border: 2px solid var(--stroke);
  cursor: pointer;
  transition: transform var(--dur) ease-out, border-color var(--dur) ease-out, background var(--dur) ease-out;
}

.page-contact .check-item:hover {
  transform: translate(-3px, -3px);
  border-color: var(--lime);
}

.page-contact .check-item input {
  position: absolute;
  opacity: 0;
  width: 22px;
  height: 22px;
  margin: 0;
}

.page-contact .check-box {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--navy-900);
  border: 2px solid var(--stroke-2);
  transition: background var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-contact .check-item input:focus-visible + .check-box {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-contact .check-item input:checked + .check-box {
  background: var(--lime);
  border-color: var(--lime);
}

.page-contact .check-item input:checked + .check-box::after {
  content: "";
  width: 6px;
  height: 11px;
  border-right: 3px solid var(--ink-900);
  border-bottom: 3px solid var(--ink-900);
  transform: rotate(43deg) translate(-1px, -2px);
}

.page-contact .check-text {
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .check-text strong {
  display: block;
  color: var(--text);
  font-family: var(--font-head);
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  margin-bottom: 3px;
}

.page-contact .check-text a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 2px solid rgba(198, 255, 61, 0.34);
}

.page-contact .check-text a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-contact .prepare-figure {
  margin: 0;
}

.page-contact .prepare-figure img {
  aspect-ratio: 3 / 2;
}

/* ---------- 处理流程 ---------- */
.page-contact .process-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-contact .process-steps::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 18px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--stroke) 46%, var(--stroke-2) 100%);
}

.page-contact .process-step {
  position: relative;
  padding-left: 46px;
  margin-bottom: 14px;
}

.page-contact .process-step::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 24px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 6px var(--ink-900);
  z-index: 1;
}

.page-contact .process-step:nth-child(even)::before {
  border-color: var(--orange);
}

.page-contact .step-details {
  border: 2px solid var(--stroke);
  background: var(--ink-800);
  transition: border-color var(--dur) ease-out;
}

.page-contact .step-details[open] {
  border-color: var(--stroke-2);
}

.page-contact .step-details summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px var(--pc-pad);
}

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

.page-contact .step-details summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-contact .step-num {
  font-size: 1rem;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.06em;
}

.page-contact .process-step:nth-child(even) .step-num {
  color: var(--orange);
}

.page-contact .step-title {
  flex: 1 1 auto;
  font-family: var(--font-head);
  font-size: 1.14rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.page-contact .step-toggle {
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
}

.page-contact .step-toggle::before,
.page-contact .step-toggle::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform var(--dur) ease-out;
}

.page-contact .step-toggle::before {
  left: 0;
  top: 8px;
  width: 18px;
  height: 2px;
}

.page-contact .step-toggle::after {
  left: 8px;
  top: 0;
  width: 2px;
  height: 18px;
}

.page-contact .step-details[open] .step-toggle::after {
  transform: scaleY(0);
}

.page-contact .step-body {
  padding: 0 var(--pc-pad) 18px calc(var(--pc-pad) + 30px);
}

.page-contact .step-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
  max-width: 62ch;
}

/* ---------- 合作方向 ---------- */
.page-contact .coop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
}

.page-contact .coop-card {
  border: 2px solid var(--stroke);
  border-left: 4px solid var(--lime);
  background: var(--ink-800);
  box-shadow: var(--shadow);
  transition: transform var(--dur) ease-out, box-shadow var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-contact .coop-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.45);
}

.page-contact .coop-card[open] {
  border-left-color: var(--orange);
}

.page-contact .coop-card summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: var(--pc-pad);
}

.page-contact .coop-card summary::-webkit-details-marker {
  display: none;
}

.page-contact .coop-card summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-contact .coop-index {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.14em;
}

.page-contact .coop-card[open] .coop-index {
  color: var(--orange);
}

.page-contact .coop-title {
  flex: 1 1 auto;
  font-family: var(--font-head);
  font-size: 1.24rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-contact .coop-hint {
  font-size: 0.78rem;
  color: var(--muted);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border: 2px solid var(--stroke);
}

.page-contact .coop-body {
  padding: 0 var(--pc-pad) var(--pc-pad);
  border-top: 2px solid var(--stroke);
  margin-top: 2px;
  padding-top: 16px;
}

.page-contact .coop-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-contact .coop-meta {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 2px dashed var(--stroke);
  font-family: var(--font-mono);
  font-size: 0.8rem !important;
  color: var(--lime) !important;
}

.page-contact .coop-foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-contact .coop-foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 2px solid rgba(198, 255, 61, 0.34);
  transition: color var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-contact .coop-foot a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 底部横向色带 ---------- */
.page-contact .contact-band {
  position: relative;
  margin-top: clamp(44px, 6vw, 90px);
  border-top: 2px solid var(--stroke);
  border-bottom: 2px solid var(--stroke);
  background:
    linear-gradient(94deg, rgba(198, 255, 61, 0.14) 0%, rgba(198, 255, 61, 0) 46%),
    linear-gradient(266deg, rgba(255, 138, 43, 0.13) 0%, rgba(255, 138, 43, 0) 40%),
    var(--navy-900);
  padding: clamp(28px, 4vw, 52px) 0;
}

.page-contact .contact-band::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  height: 4px;
  width: min(62%, 780px);
  background: linear-gradient(90deg, var(--lime) 0 62%, var(--orange) 62% 100%);
}

.page-contact .band-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.page-contact .band-block {
  border-left: 2px solid var(--stroke-2);
  padding-left: 18px;
}

.page-contact .band-block .eyebrow {
  margin: 0 0 8px;
}

.page-contact .band-text {
  margin: 0;
  max-width: 42ch;
  color: var(--text);
  font-size: 0.96rem;
  line-height: 1.8;
}

.page-contact .band-text.mono {
  font-size: clamp(1.1rem, 2.6vw, 1.6rem);
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-contact .band-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 2px solid rgba(198, 255, 61, 0.4);
  transition: color var(--dur) ease-out, border-color var(--dur) ease-out;
}

.page-contact .band-link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .channel-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .channel-card:nth-child(3) {
    grid-column: 1 / -1;
  }

  .page-contact .checklist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-contact .coop-card:first-child {
    grid-column: 1 / -1;
  }

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

  .page-contact .band-actions {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-contact .contact-hero h1 {
    max-width: 18ch;
  }

  .page-contact .channel-layout {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: stretch;
  }

  .page-contact .channel-cards {
    grid-template-columns: 1fr;
  }

  .page-contact .channel-card:nth-child(3) {
    grid-column: auto;
  }

  .page-contact .channel-figure {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-contact .prepare-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-contact .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(22px, 2.6vw, 36px);
  }

  .page-contact .topic-item:nth-child(2) {
    margin-top: clamp(18px, 3vw, 44px);
  }

  .page-contact .topic-item:nth-child(4) {
    margin-top: clamp(18px, 3vw, 44px);
  }

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

  .page-contact .coop-card:first-child {
    grid-column: auto;
  }

  .page-contact .coop-card:nth-child(2) {
    margin-top: clamp(16px, 2.4vw, 32px);
  }

  .page-contact .band-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.6fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-contact .band-actions {
    grid-column: auto;
  }
}

@media (min-width: 1200px) {
  .page-contact .contact-hero::after {
    right: -4%;
    top: 4%;
  }

  .page-contact .process-step {
    padding-left: 58px;
  }

  .page-contact .process-steps::before {
    left: 15px;
  }

  .page-contact .process-step::before {
    left: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .check-item,
  .page-contact .coop-card,
  .page-contact .channel-value,
  .page-contact .step-toggle::before,
  .page-contact .step-toggle::after {
    transition: none;
  }

  .page-contact .check-item:hover,
  .page-contact .coop-card:hover {
    transform: none;
  }
}