.page-contact {
  --co-pad: clamp(20px, 3.4vw, 44px);
  --co-gap: clamp(16px, 2.4vw, 28px);
  --co-edge: 1px solid var(--grid);
  background: var(--ink);
  color: var(--mist);
}

/* ---------- 面包屑 ---------- */
.page-contact .co-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 16px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-contact .co-crumb a {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-contact .co-crumb a:hover,
.page-contact .co-crumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-contact .co-crumb span[aria-current="page"] {
  color: var(--mist);
}

/* ---------- 首屏分屏 ---------- */
.page-contact .co-hero {
  border-bottom: var(--co-edge);
}

.page-contact .co-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "left"
    "panels"
    "contact";
  border-inline: var(--co-edge);
}

.page-contact .co-left {
  grid-area: left;
  padding: var(--co-pad);
  background-color: var(--teal);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(232, 240, 238, 0.05) 0 1px,
    transparent 1px 64px
  );
  border-bottom: var(--co-edge);
}

.page-contact .co-left h1 {
  margin: 16px 0 0;
  font-size: clamp(30px, 6.4vw, 54px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-contact .co-lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作类型索引 ---------- */
.page-contact .co-type-list {
  margin-top: clamp(24px, 3.4vw, 34px);
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: var(--co-edge);
}

.page-contact .co-type-btn {
  display: flex;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  margin: 0;
  padding: 14px 16px;
  border: 0;
  border-left: 3px solid transparent;
  background: #07352F;
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-contact .co-type-btn:hover {
  background: rgba(184, 255, 46, 0.08);
  color: var(--white);
}

.page-contact .co-type-btn[aria-selected="true"] {
  background: rgba(184, 255, 46, 0.14);
  border-left-color: var(--lime);
  color: var(--white);
}

.page-contact .co-type-btn:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-contact .co-type-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lime);
  flex: 0 0 auto;
}

.page-contact .co-type-name {
  min-width: 0;
}

/* ---------- 面板区 ---------- */
.page-contact .co-panels {
  grid-area: panels;
  padding: 4px var(--co-pad) var(--co-pad);
  background: var(--layer);
  border-bottom: var(--co-edge);
}

.page-contact .co-panel {
  padding: 24px 0 8px;
  border-top: var(--co-edge);
}

.page-contact .co-panel:first-child {
  border-top: 0;
}

.page-contact .co-panel-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 12px;
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .co-panel-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--lime);
  flex: 0 0 auto;
}

.page-contact .co-panel-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

.page-contact .co-panel-body a,
.page-contact .co-contact-meta a,
.page-contact .co-faq-item p a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 46, 0.35);
}

.page-contact .co-panel-body a:hover,
.page-contact .co-contact-meta a:hover,
.page-contact .co-faq-item p a:hover {
  border-bottom-color: var(--lime);
}

.page-contact .co-facts {
  margin: 16px 0 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: var(--co-edge);
}

.page-contact .co-fact {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
  padding: 11px 14px;
  background: var(--layer);
}

.page-contact .co-fact dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mute);
  padding-top: 2px;
}

.page-contact .co-fact dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 联系面板 ---------- */
.page-contact .co-contact {
  grid-area: contact;
  padding: var(--co-pad);
  background: var(--indigo);
  border-top: var(--co-edge);
}

.page-contact .co-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-contact .co-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184, 255, 46, 0.16);
  animation: co-pulse 2.4s ease-in-out infinite;
}

@keyframes co-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(184, 255, 46, 0.16); }
  50% { box-shadow: 0 0 0 8px rgba(184, 255, 46, 0.04); }
}

.page-contact .co-contact-title {
  margin: 18px 0 8px;
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .co-contact-lead {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 240, 238, 0.78);
}

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

.page-contact .co-contact-row {
  display: grid;
  gap: 5px;
  padding: 13px 0;
  border-top: 1px solid rgba(232, 240, 238, 0.14);
}

.page-contact .co-contact-row:last-child {
  border-bottom: 1px solid rgba(232, 240, 238, 0.14);
}

.page-contact .co-contact-key {
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-contact .co-contact-val {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-contact .co-contact-note {
  margin: 18px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mute);
}

.page-contact .co-contact-meta {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 对接流程 ---------- */
.page-contact .co-flow {
  padding: clamp(44px, 7vw, 90px) 0;
  background: var(--ink);
  border-bottom: var(--co-edge);
}

.page-contact .co-steps {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: var(--co-edge);
}

.page-contact .co-step {
  position: relative;
  padding: 22px 20px 24px;
  background: #0D1416;
}

.page-contact .co-step-num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--lime);
}

.page-contact .co-step h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-contact .co-step p {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mute);
}

.page-contact .co-step .co-step-out {
  margin: 0;
  padding-top: 11px;
  border-top: 1px dashed var(--grid);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-contact .co-step-out b {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--blue);
}

.page-contact .co-flow-figure {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
}

.page-contact .co-flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: var(--co-edge);
  filter: contrast(1.08) saturate(0.85);
}

.page-contact .co-flow-figure figcaption {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--lime);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 地域协作 ---------- */
.page-contact .co-hebei {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 8vw, 104px) 0;
  background: var(--teal);
  border-bottom: var(--co-edge);
}

.page-contact .co-hebei-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: grayscale(0.55) contrast(1.15);
}

.page-contact .co-hebei::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(6, 46, 44, 0.97) 0%,
    rgba(6, 46, 44, 0.78) 52%,
    rgba(27, 18, 54, 0.72) 100%
  );
  pointer-events: none;
}

.page-contact .co-hebei-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--co-gap);
}

.page-contact .co-hebei-text h2 {
  margin: 16px 0 14px;
  font-size: clamp(22px, 3.8vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-contact .co-hebei-text p {
  margin: 0 0 14px;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(232, 240, 238, 0.82);
}

.page-contact .co-hebei-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(232, 240, 238, 0.1);
  border: 1px solid rgba(232, 240, 238, 0.16);
  align-self: start;
}

.page-contact .co-hebei-list li {
  position: relative;
  padding: 15px 16px 15px 34px;
  background: rgba(6, 46, 44, 0.86);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-contact .co-hebei-list li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 21px;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  padding: clamp(44px, 7vw, 90px) 0;
  background: var(--ink);
}

.page-contact .co-faq-list {
  margin-top: clamp(22px, 3vw, 32px);
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: var(--co-edge);
}

.page-contact .co-faq-item {
  background: var(--layer);
}

.page-contact .co-faq-item summary {
  position: relative;
  padding: 18px 48px 18px 18px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
  transition: background 0.2s var(--ease);
}

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

.page-contact .co-faq-item summary:hover {
  background: rgba(184, 255, 46, 0.05);
}

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

.page-contact .co-faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--lime);
}

.page-contact .co-faq-item[open] summary::after {
  content: "−";
}

.page-contact .co-faq-item p {
  margin: 0;
  padding: 0 18px 20px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mute);
  border-top: 1px dashed var(--grid);
  padding-top: 14px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-contact .co-fact {
    grid-template-columns: 96px minmax(0, 1fr);
    padding: 12px 16px;
  }
}

/* ---------- 桌面分屏 ---------- */
@media (min-width: 1000px) {
  .page-contact .co-hero-inner {
    grid-template-columns: minmax(0, 1fr) 396px;
    grid-template-areas:
      "left contact"
      "panels contact";
    align-items: stretch;
  }

  .page-contact .co-left {
    border-bottom: 0;
    padding: clamp(32px, 3.6vw, 56px);
  }

  .page-contact .co-panels {
    padding: 0 clamp(32px, 3.6vw, 56px) clamp(32px, 3.6vw, 48px);
    border-bottom: 0;
  }

  .page-contact .co-contact {
    border-top: 0;
    border-left: var(--co-edge);
    position: sticky;
    top: calc(var(--rail-h) + var(--index-h) + 14px);
    align-self: start;
    max-height: calc(100vh - var(--rail-h) - var(--index-h) - 28px);
    overflow-y: auto;
  }

  .page-contact .co-panel:first-child {
    border-top: var(--co-edge);
    padding-top: 28px;
  }

  .page-contact .co-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-contact .co-step:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -6px;
    top: 46px;
    width: 11px;
    height: 1px;
    background: var(--lime);
    transform: rotate(-32deg);
    z-index: 2;
  }

  .page-contact .co-hebei-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-contact .co-faq-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-contact .co-status-dot {
    animation: none;
  }

  .page-contact .co-type-btn,
  .page-contact .co-faq-item summary {
    transition: none;
  }
}
<<<END>>>