.page-contact {
  --co-hair: rgba(27, 38, 71, 0.62);
  --co-hair-cyan: rgba(22, 224, 224, 0.26);
  position: relative;
  isolation: isolate;
  padding-bottom: clamp(3rem, 7vw, 6rem);
  color: var(--white);
  font-family: var(--font-sans);
  background:
    radial-gradient(760px 420px at 84% -6%, rgba(22, 224, 224, 0.09), transparent 62%),
    radial-gradient(620px 380px at 4% 28%, rgba(14, 143, 152, 0.07), transparent 64%);
}

.page-contact .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: clamp(1.1rem, 3vw, 1.9rem);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-contact .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-contact .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(22, 224, 224, 0.55);
}

/* ---------- 首屏 ---------- */

.page-contact .co-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 2rem);
  padding-top: clamp(1.6rem, 4vw, 3.2rem);
  padding-bottom: clamp(1.6rem, 3.4vw, 2.6rem);
  border-bottom: 1px solid var(--co-hair);
}

.page-contact .co-hero__lead .label {
  display: block;
  margin-bottom: 0.9rem;
  color: var(--cyan);
}

.page-contact .co-hero h1 {
  margin: 0;
  font-size: clamp(1.85rem, 5.8vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  max-width: 18em;
  color: var(--white);
}

.page-contact .co-hero__desc p {
  margin: 0 0 0.9rem;
  max-width: 34em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .co-hero__desc p:last-child {
  margin-bottom: 0;
}

/* ---------- 通栏视觉 ---------- */

.page-contact .co-banner {
  margin: clamp(1.6rem, 4vw, 3rem) 0 0;
  padding: 0 var(--gutter);
}

.page-contact .co-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  border: 1px solid var(--co-hair-cyan);
  border-radius: var(--radius);
  filter: saturate(0.88) brightness(0.82);
}

.page-contact .co-banner figcaption {
  margin-top: 0.7rem;
  color: var(--mist);
}

/* ---------- 通用区块标头 ---------- */

.page-contact .co-head .label {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--cyan);
}

.page-contact .co-head h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3.6vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--white);
}

.page-contact .co-head__note {
  margin: 0.7rem 0 0;
  max-width: 34em;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 01 合作方向 ---------- */

.page-contact .co-tracks {
  margin-top: clamp(2.6rem, 6vw, 5rem);
}

.page-contact .co-tracks__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.3rem, 3vw, 2.4rem);
  margin-top: clamp(1.4rem, 3.4vw, 2.4rem);
}

.page-contact .co-track-list {
  display: grid;
  gap: 0.75rem;
  min-width: 0;
}

.page-contact .co-track {
  border: 1px solid var(--co-hair);
  border-left: 2px solid rgba(22, 224, 224, 0.45);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(11, 19, 48, 0.92), rgba(5, 10, 30, 0.86));
  overflow: hidden;
  transition: border-color 200ms var(--ease);
}

.page-contact .co-track:hover {
  border-color: rgba(22, 224, 224, 0.4);
}

.page-contact .co-track__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas:
    "idx name mark"
    "idx meta mark";
  align-items: center;
  gap: 0.3rem 1rem;
  padding: clamp(0.95rem, 2.6vw, 1.35rem) clamp(1rem, 2.4vw, 1.5rem);
  cursor: pointer;
  list-style: none;
}

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

.page-contact .co-track__idx {
  grid-area: idx;
  align-self: start;
  padding-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-contact .co-track__name {
  grid-area: name;
  font-size: clamp(1.02rem, 2.2vw, 1.3rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--white);
}

.page-contact .co-track__meta {
  grid-area: meta;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-contact .co-track__mark {
  grid-area: mark;
  position: relative;
  width: 18px;
  height: 18px;
  border: 1px solid rgba(22, 224, 224, 0.5);
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-contact .co-track__mark::before,
.page-contact .co-track__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 1px;
  background: var(--cyan);
  transform: translate(-50%, -50%);
}

.page-contact .co-track__mark::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-contact .co-track[open] .co-track__mark::after {
  opacity: 0;
}

.page-contact .co-track__body {
  border-top: 1px solid var(--co-hair);
  padding: clamp(0.95rem, 2.4vw, 1.3rem) clamp(1rem, 2.4vw, 1.5rem)
    clamp(1.15rem, 2.8vw, 1.6rem) clamp(2.4rem, 6vw, 3.6rem);
  animation: co-drop 240ms var(--ease);
}

.page-contact .co-track__body p {
  margin: 0;
  max-width: 36em;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .co-track__out {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-contact .co-track__out li {
  display: grid;
  grid-template-columns: 3.6em minmax(0, 1fr);
  gap: 0.7rem;
  align-items: baseline;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .co-track__out .label {
  color: var(--cyan-dim);
}

.page-contact .co-tracks__media {
  margin: 0;
  min-width: 0;
  border: 1px solid var(--co-hair-cyan);
  border-radius: var(--radius);
  overflow: hidden;
  align-self: start;
}

.page-contact .co-tracks__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.78);
}

.page-contact .co-tracks__media figcaption {
  padding: 0.7rem clamp(0.9rem, 2vw, 1.1rem) 0.85rem;
  background: rgba(11, 19, 48, 0.94);
  border-top: 1px solid var(--co-hair);
  color: var(--mist);
}

/* ---------- 02 双栏：流程 + 联系 ---------- */

.page-contact .co-duo {
  margin-top: clamp(2.8rem, 6vw, 5rem);
}

.page-contact .co-duo__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3rem);
  margin-top: clamp(1.4rem, 3vw, 2.2rem);
}

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

.page-contact .co-steps {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 0;
}

.page-contact .co-step {
  position: relative;
  padding: clamp(0.95rem, 2.4vw, 1.4rem) 0 clamp(0.95rem, 2.4vw, 1.4rem)
    clamp(3.2rem, 8vw, 4.4rem);
  border-top: 1px solid var(--co-hair);
  transition: background 220ms var(--ease);
}

.page-contact .co-step:last-child {
  border-bottom: 1px solid var(--co-hair);
}

.page-contact .co-step:hover {
  background: linear-gradient(90deg, rgba(22, 224, 224, 0.07), transparent 72%);
}

.page-contact .co-step__num {
  position: absolute;
  left: 0;
  top: clamp(1rem, 2.5vw, 1.5rem);
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: rgba(22, 224, 224, 0.5);
  letter-spacing: -0.02em;
}

.page-contact .co-step h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-contact .co-step p {
  margin: 0;
  max-width: 36em;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .co-step__hint {
  display: inline-block;
  margin-top: 0.7rem;
  padding: 0.25rem 0.7rem;
  border: 1px solid rgba(14, 143, 152, 0.55);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan-dim);
}

.page-contact .co-side {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.2rem);
  align-content: start;
  min-width: 0;
}

.page-contact .co-contact__plates {
  margin: clamp(1rem, 2.4vw, 1.4rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--co-hair);
  border: 1px solid var(--co-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .co-plate {
  background: var(--ink-800);
  padding: clamp(0.85rem, 2.2vw, 1.15rem) clamp(1rem, 2.4vw, 1.3rem);
}

.page-contact .co-plate dt {
  margin-bottom: 0.4rem;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-contact .co-plate dd {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.65;
  color: var(--white);
  overflow-wrap: break-word;
  word-break: break-word;
}

.page-contact .co-plate--mono dd {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.page-contact .co-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 224, 224, 0.42);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-contact .co-fix {
  border: 1px dashed rgba(22, 224, 224, 0.32);
  border-radius: var(--radius);
  padding: clamp(1.1rem, 2.8vw, 1.5rem);
  background: rgba(11, 19, 48, 0.62);
}

.page-contact .co-fix h2 {
  margin: 0.7rem 0 0;
  font-size: clamp(1.2rem, 2.8vw, 1.6rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--white);
}

.page-contact .co-fix p {
  margin: 0.8rem 0 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .co-fix__list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-contact .co-fix__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .co-fix__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: var(--glow-cyan);
}

/* ---------- 03 共建规模 ---------- */

.page-contact .co-scale {
  margin-top: clamp(2.8rem, 6vw, 5rem);
}

.page-contact .co-scale__grid {
  margin-top: clamp(1.2rem, 3vw, 2rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--co-hair);
  border: 1px solid var(--co-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .co-scale__cell {
  background: linear-gradient(165deg, rgba(11, 19, 48, 0.96), rgba(5, 10, 30, 0.9));
  padding: clamp(1.2rem, 3vw, 1.9rem);
}

.page-contact .co-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 7vw, 4.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  text-shadow: var(--glow-gold);
}

.page-contact .co-scale__unit {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-contact .co-scale__text {
  background: rgba(11, 19, 48, 0.9);
  padding: clamp(1.2rem, 3vw, 1.9rem);
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-contact .co-scale__text p {
  margin: 0 0 0.85rem;
  max-width: 40em;
}

.page-contact .co-scale__text p:last-child {
  margin-bottom: 0;
}

.page-contact .co-scale__text strong {
  color: var(--white);
  font-weight: 600;
}

/* ---------- 04 常见问题 ---------- */

.page-contact .co-faq {
  margin-top: clamp(2.8rem, 6vw, 5rem);
}

.page-contact .co-faq__list {
  margin-top: clamp(1.2rem, 3vw, 1.9rem);
  border-top: 1px solid var(--co-hair);
}

.page-contact .co-faq__item {
  border-bottom: 1px solid var(--co-hair);
}

.page-contact .co-faq__q {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.2rem;
  padding: clamp(0.9rem, 2.4vw, 1.3rem) 0;
  cursor: pointer;
  list-style: none;
  font-size: clamp(0.98rem, 2vw, 1.08rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
  transition: color 180ms var(--ease);
}

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

.page-contact .co-faq__q:hover {
  color: var(--cyan);
}

.page-contact .co-faq__q::after {
  content: "＋";
  flex: 0 0 auto;
  font-size: 0.9rem;
  line-height: 1;
  color: var(--cyan);
  transition: transform 220ms var(--ease);
}

.page-contact .co-faq__item[open] .co-faq__q {
  padding-bottom: 0.5rem;
}

.page-contact .co-faq__item[open] .co-faq__q::after {
  transform: rotate(45deg);
}

.page-contact .co-faq__a {
  max-width: 42em;
  padding: 0 0 clamp(1rem, 2.6vw, 1.4rem);
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--mist);
  animation: co-drop 220ms var(--ease);
}

.page-contact .co-faq__a p {
  margin: 0;
}

/* ---------- 相关页面 ---------- */

.page-contact .co-ref {
  margin-top: clamp(2.6rem, 6vw, 4.6rem);
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
  border-top: 1px solid var(--co-hair);
}

.page-contact .co-ref__list {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-contact .co-ref__list a {
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-contact .co-ref__list a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(22, 224, 224, 0.55);
}

@keyframes co-drop {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 媒体查询 ---------- */

@media (min-width: 720px) {
  .page-contact .co-scale__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .co-scale__text {
    grid-column: 1 / -1;
  }

  .page-contact .co-ref__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem 2rem;
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: end;
  }

  .page-contact .co-tracks__layout {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-contact .co-duo__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(2.4rem, 5vw, 4rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-track__body,
  .page-contact .co-faq__a {
    animation: none;
  }

  .page-contact .co-faq__q::after,
  .page-contact .co-step,
  .page-contact .co-track {
    transition: none;
  }
}
<<<END>>>