.page-contact {
  --co-gap: clamp(20px, 3vw, 36px);
  --co-edge: clamp(24px, 4vw, 44px);
}

/* ---------- 面包屑 ---------- */
.page-contact .crumb {
  margin-top: clamp(16px, 2.4vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  position: relative;
  padding-block: clamp(28px, 5vw, 60px) clamp(40px, 6vw, 80px);
  overflow: hidden;
}

.page-contact .co-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(680px, 78vw);
  height: min(460px, 60vw);
  background: radial-gradient(circle at 60% 35%, rgba(40, 225, 255, 0.2), rgba(40, 225, 255, 0) 66%);
  pointer-events: none;
  z-index: 0;
}

.page-contact .co-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--co-gap);
  align-items: center;
}

.page-contact .co-hero__intro h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.6vw, 68px);
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: var(--ice);
}

.page-contact .co-hero__intro .lede {
  margin-top: clamp(14px, 2vw, 22px);
  max-width: 56ch;
  color: var(--mist);
}

.page-contact .co-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-contact .co-hero__fig {
  position: relative;
  margin: 0;
  aspect-ratio: 14 / 9;
  border: var(--line) solid var(--ink-700);
  box-shadow: 10px 10px 0 rgba(5, 11, 31, 0.85);
  clip-path: polygon(0 0, 100% 0, 100% 88%, 88% 100%, 0 100%);
}

@media (min-width: 960px) {
  .page-contact .co-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 64px);
  }
}

/* ---------- 章节头 ---------- */
.page-contact .co-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.4vw, 26px);
  padding-bottom: clamp(16px, 2.4vw, 24px);
  border-bottom: var(--line) solid var(--ink-700);
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-contact .co-num {
  flex: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(42px, 8vw, 84px);
  line-height: 0.82;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 2px var(--ink-700);
  text-stroke: 2px var(--ink-700);
}

.page-contact .co-head__text .sec-title {
  margin-top: 6px;
}

/* ---------- 合作方向 ---------- */
.page-contact .co-dir {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--co-gap);
}

.page-contact .co-dir__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-contact .co-dir__tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-contact .co-dir__tab {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
  padding: 13px 20px;
  border: var(--line) solid var(--ink-700);
  background: var(--ink-800);
  color: var(--mist);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

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

.page-contact .co-dir__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-contact .co-dir__panels {
  min-height: 1px;
}

.page-contact .co-dir__panel {
  display: none;
  padding: clamp(22px, 3.4vw, 38px);
  border: var(--line) solid var(--ink-700);
  border-left: 4px solid var(--cyan);
  background: linear-gradient(150deg, rgba(40, 225, 255, 0.07), rgba(10, 23, 56, 0) 58%), var(--ink-800);
  box-shadow: 8px 8px 0 rgba(5, 11, 31, 0.85);
}

.page-contact .co-dir__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.15;
  color: var(--ice);
}

.page-contact .co-dir__lead {
  margin-top: 14px;
  color: var(--mist);
  max-width: 62ch;
}

.page-contact .co-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .co-list li {
  position: relative;
  padding-left: 24px;
  color: var(--ice);
  font-size: 15px;
  line-height: 1.65;
}

.page-contact .co-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan);
  background: transparent;
}

.page-contact .co-fit {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 2px dashed var(--ink-700);
  font-size: 14px;
  color: var(--mist-dim);
}

#codir-1:checked ~ .co-dir__tabs .co-dir__tab[for="codir-1"],
#codir-2:checked ~ .co-dir__tabs .co-dir__tab[for="codir-2"],
#codir-3:checked ~ .co-dir__tabs .co-dir__tab[for="codir-3"],
#codir-4:checked ~ .co-dir__tabs .co-dir__tab[for="codir-4"] {
  border-color: var(--cyan);
  color: var(--ice);
  background: linear-gradient(90deg, rgba(40, 225, 255, 0.18), rgba(10, 23, 56, 0) 82%), var(--ink-800);
}

#codir-1:focus-visible ~ .co-dir__tabs .co-dir__tab[for="codir-1"],
#codir-2:focus-visible ~ .co-dir__tabs .co-dir__tab[for="codir-2"],
#codir-3:focus-visible ~ .co-dir__tabs .co-dir__tab[for="codir-3"],
#codir-4:focus-visible ~ .co-dir__tabs .co-dir__tab[for="codir-4"] {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

#codir-1:checked ~ .co-dir__panels .co-dir__panel:nth-child(1),
#codir-2:checked ~ .co-dir__panels .co-dir__panel:nth-child(2),
#codir-3:checked ~ .co-dir__panels .co-dir__panel:nth-child(3),
#codir-4:checked ~ .co-dir__panels .co-dir__panel:nth-child(4) {
  display: block;
}

@media (min-width: 900px) {
  .page-contact .co-dir {
    grid-template-columns: 258px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-contact .co-dir__tabs {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 12px;
  }

  .page-contact .co-dir__tab {
    width: 100%;
    justify-content: flex-start;
    padding: 16px 20px;
  }
}

/* ---------- 合作流程 ---------- */
.page-contact .co-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--co-gap);
}

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

.page-contact .co-step {
  position: relative;
  padding: 20px 22px 20px 26px;
  border: var(--line) solid var(--ink-700);
  background: var(--ink-800);
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.page-contact .co-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--ink-700);
  transition: background 0.2s ease;
}

.page-contact .co-step:hover {
  border-color: var(--cyan);
  transform: translateX(6px);
  background: linear-gradient(90deg, rgba(40, 225, 255, 0.08), rgba(10, 23, 56, 1) 72%), var(--ink-800);
}

.page-contact .co-step:hover::before {
  background: var(--cyan);
}

.page-contact .co-step__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--orange);
}

.page-contact .co-step__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 26px);
  color: var(--ice);
}

.page-contact .co-step__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.68;
  color: var(--mist);
}

.page-contact .co-step__time {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  border: 2px solid var(--ink-700);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-dim);
}

.page-contact .co-flow__aside {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-contact .co-flow__fig {
  margin: 0;
  aspect-ratio: 10 / 7;
  border: var(--line) solid var(--ink-700);
  box-shadow: 8px 8px 0 rgba(5, 11, 31, 0.85);
}

.page-contact .co-link {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
}

.page-contact .co-flow__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-dim);
}

@media (min-width: 980px) {
  .page-contact .co-flow {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 60px);
    align-items: start;
  }
}

/* ---------- 材料清单 ---------- */
.page-contact .co-materials {
  display: grid;
  gap: 12px;
}

.page-contact .co-mat {
  border: var(--line) solid var(--ink-700);
  background: var(--ink-800);
  transition: border-color 0.2s ease;
}

.page-contact .co-mat[open] {
  border-color: var(--cyan);
}

.page-contact .co-mat__sum {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--ice);
}

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

.page-contact .co-mat__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--cyan);
}

.page-contact .co-mat[open] .co-mat__sum::after {
  content: "–";
}

.page-contact .co-mat__tag {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 2px solid var(--cyan);
  font-size: 13px;
  color: var(--cyan);
}

.page-contact .co-mat__name {
  flex: 1 1 auto;
  min-width: 0;
}

.page-contact .co-mat__hint {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-dim);
}

.page-contact .co-mat__body {
  padding: 0 20px 20px 66px;
}

.page-contact .co-mat__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 联系渠道 ---------- */
.page-contact .co-contact {
  position: relative;
  padding: clamp(26px, 4vw, 52px);
  border: var(--line) solid var(--cyan);
  background:
    linear-gradient(125deg, rgba(40, 225, 255, 0.16), rgba(5, 11, 31, 0) 52%),
    linear-gradient(315deg, rgba(255, 123, 46, 0.14), rgba(5, 11, 31, 0) 48%),
    var(--ink-800);
  box-shadow: 12px 12px 0 rgba(5, 11, 31, 0.9);
  overflow: hidden;
}

.page-contact .co-contact::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 220px;
  height: 220px;
  border: 2px solid var(--ink-700);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-contact .co-contact__lead {
  position: relative;
  z-index: 1;
  max-width: 60ch;
}

.page-contact .co-contact__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.05;
  color: var(--ice);
}

.page-contact .co-contact__lead p {
  margin: 14px 0 0;
  color: var(--mist);
}

.page-contact .co-contact__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-contact .co-contact__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 16px 0;
  border-top: 2px solid var(--ink-700);
}

.page-contact .co-contact__label {
  flex: none;
  width: 92px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mist-dim);
}

.page-contact .co-contact__value {
  flex: 1 1 220px;
  min-width: 0;
  font-size: clamp(15px, 2vw, 19px);
  word-break: break-all;
  color: var(--ice);
}

.page-contact .co-contact__note {
  position: relative;
  z-index: 1;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding-top: 16px;
  border-top: 2px solid var(--ink-700);
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist-dim);
}

/* ---------- 常见合作问题 ---------- */
.page-contact .co-faq {
  display: grid;
  gap: 10px;
}

.page-contact .co-faq__item {
  border: var(--line) solid var(--ink-700);
  background: var(--ink-800);
  transition: border-color 0.2s ease;
}

.page-contact .co-faq__item[open] {
  border-color: var(--orange);
}

.page-contact .co-faq__q {
  position: relative;
  padding: 17px 52px 17px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2.1vw, 20px);
  line-height: 1.35;
  color: var(--ice);
}

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

.page-contact .co-faq__q::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 14px;
  height: 2px;
  margin-top: -1px;
  background: var(--orange);
}

.page-contact .co-faq__q::before {
  content: "";
  position: absolute;
  right: 26px;
  top: 50%;
  width: 2px;
  height: 14px;
  margin-top: -7px;
  background: var(--orange);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.page-contact .co-faq__item[open] .co-faq__q::before {
  transform: scaleY(0);
  opacity: 0;
}

.page-contact .co-faq__a {
  padding: 0 20px 20px;
}

.page-contact .co-faq__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

@media (min-width: 780px) {
  .page-contact .co-materials {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-dir__tab,
  .page-contact .co-step,
  .page-contact .co-mat,
  .page-contact .co-faq__item,
  .page-contact .co-faq__q::before {
    transition: none;
  }

  .page-contact .co-step:hover {
    transform: none;
  }
}
<<<END>>>