.page-contact {
  --co-edge: 3px;
  --co-hard: 6px 6px 0 rgba(0, 0, 0, .5);
  background: var(--ink-950);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-contact .co-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  padding-bottom: 16px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}
.page-contact .co-head__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold-400);
}
.page-contact .co-head__title {
  margin: 0;
  flex: 1 1 260px;
  font-size: clamp(21px, 2.6vw, 33px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-contact .co-head__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(59, 240, 208, .10), transparent 58%),
    var(--ink-950);
}
.page-contact .co-hero__inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px var(--step) 48px;
}
.page-contact .co-hero .breadcrumb {
  margin-bottom: 26px;
}
.page-contact .co-hero .eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan-400);
}
.page-contact .co-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}
.page-contact .co-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(29px, 5.2vw, 54px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.03em;
  color: var(--paper);
}
.page-contact .co-hero .lede {
  margin: 0 0 34px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-soft);
}

/* 三条合作方向 */
.page-contact .co-dirs {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-contact .co-dir {
  border-bottom: 1px solid var(--line);
}
.page-contact .co-dir > summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 22px;
  align-items: center;
  gap: 12px;
  min-height: 84px;
  padding: 16px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color .28s var(--ease), box-shadow .28s var(--ease);
}
.page-contact .co-dir > summary::-webkit-details-marker {
  display: none;
}
.page-contact .co-dir > summary:hover,
.page-contact .co-dir > summary:focus-visible {
  background: var(--coal-900);
  box-shadow: inset 3px 0 0 0 var(--cyan-400);
  outline: none;
}
.page-contact .co-dir__idx {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--gold-400);
}
.page-contact .co-dir__name {
  display: block;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-contact .co-dir__tag {
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .04em;
  color: var(--muted);
}
.page-contact .co-dir__sign {
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--cyan-400);
  transition: transform .28s var(--ease);
}
.page-contact .co-dir[open] > summary .co-dir__sign {
  transform: rotate(45deg);
}
.page-contact .co-dir__body {
  padding: 0 4px 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}
.page-contact .co-dir__body p {
  margin: 0;
}
.page-contact .co-dir__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-contact .co-dir__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-soft);
}
.page-contact .co-dir__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 9px;
  height: 2px;
  background: var(--cyan-400);
}

/* 首屏视觉 */
.page-contact .co-hero__visual {
  display: grid;
  gap: 20px;
}
.page-contact .co-hero__frame {
  position: relative;
  margin: 0;
  border: var(--co-edge) solid var(--line-strong);
  box-shadow: var(--co-hard);
  background: var(--ink-900);
  overflow: hidden;
}
.page-contact .co-hero__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(115deg, rgba(59, 240, 208, .07) 0 2px, transparent 2px 9px);
  pointer-events: none;
}
.page-contact .co-hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 6 / 7;
  object-fit: cover;
}

.page-contact .co-rail {
  border: 1px solid var(--line);
  background: var(--coal-900);
}
.page-contact .co-rail__title {
  margin: 0;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold-400);
  border-bottom: 1px solid var(--line);
}
.page-contact .co-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-contact .co-rail__list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--paper-soft);
}
.page-contact .co-rail__list li:last-child {
  border-bottom: 0;
}
.page-contact .co-rail__list b {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan-400);
}

/* ---------- 四步流程 ---------- */
.page-contact .co-flow {
  padding: 52px 0;
  border-top: 1px solid var(--line);
  background: var(--ink-900);
}
.page-contact .co-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-contact .co-step {
  position: relative;
  padding: 22px 18px 24px;
  border: 1px solid var(--line);
  background: var(--coal-900);
  transition: background-color .28s var(--ease), border-color .28s var(--ease);
}
.page-contact .co-step:hover,
.page-contact .co-step:focus-within {
  background: var(--coal-700);
  border-color: var(--line-strong);
}
.page-contact .co-step__idx {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 10px 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-950);
  background: var(--gold-400);
  clip-path: polygon(0 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
}
.page-contact .co-step__name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-contact .co-step__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  transition: color .28s var(--ease);
}
.page-contact .co-step:hover .co-step__note,
.page-contact .co-step:focus-within .co-step__note {
  color: var(--paper-soft);
}

/* ---------- 适合的合作方 ---------- */
.page-contact .co-fit {
  padding: 52px 0;
  border-top: 1px solid var(--line);
}
.page-contact .co-fit__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}
.page-contact .co-fit__aside .co-head__idx {
  display: inline-block;
  margin-bottom: 12px;
}
.page-contact .co-fit__aside .co-head__title {
  margin-bottom: 16px;
}
.page-contact .co-fit__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}
.page-contact .co-fit__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-contact .co-fit__item {
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--line);
  transition: box-shadow .28s var(--ease);
}
.page-contact .co-fit__item:first-child {
  border-top: 1px solid var(--line);
}
.page-contact .co-fit__item:hover {
  box-shadow: inset 3px 0 0 0 var(--cyan-400);
}
.page-contact .co-fit__label {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 11px 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-950);
  background: var(--cyan-400);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}
.page-contact .co-fit__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}

/* ---------- 准备清单 ---------- */
.page-contact .co-prep {
  padding: 52px 0;
  border-top: 1px solid var(--line);
  background: var(--coal-900);
}
.page-contact .co-prep__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-contact .co-prep__item {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--ink-900);
  transition: border-color .28s var(--ease), background-color .28s var(--ease);
}
.page-contact .co-prep__item:has(.co-prep__check:checked) {
  border-color: var(--cyan-400);
  background: rgba(59, 240, 208, .07);
}
.page-contact .co-prep__check {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  margin: 2px 0 0;
  border: 2px solid var(--line-strong);
  background: var(--ink-950);
  cursor: pointer;
  position: relative;
}
.page-contact .co-prep__check:checked {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}
.page-contact .co-prep__check:checked::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 1px;
  width: 6px;
  height: 12px;
  border-right: 2px solid var(--ink-950);
  border-bottom: 2px solid var(--ink-950);
  transform: rotate(42deg);
}
.page-contact .co-prep__check:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}
.page-contact .co-prep__label {
  display: block;
  cursor: pointer;
}
.page-contact .co-prep__label strong {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
}
.page-contact .co-prep__label span {
  display: block;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-soft);
}

/* ---------- 联系方式 ---------- */
.page-contact .co-contact {
  position: relative;
  padding: 56px 0 60px;
  border-top: 1px solid var(--line);
  overflow: hidden;
}
.page-contact .co-contact__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
  pointer-events: none;
}
.page-contact .co-contact__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
}
.page-contact .co-contact .wrap {
  position: relative;
  z-index: 1;
}
.page-contact .co-contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}
.page-contact .co-contact__lead .co-head__idx {
  display: inline-block;
  margin-bottom: 12px;
}
.page-contact .co-contact__lead .co-head__title {
  margin-bottom: 16px;
}
.page-contact .co-contact__intro {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}
.page-contact .co-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-contact .co-contact__list li {
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--line);
}
.page-contact .co-contact__list li:first-child {
  border-top: 1px solid var(--line);
}
.page-contact .co-contact__key {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--gold-400);
}
.page-contact .co-contact__val {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.8vw, 24px);
  font-weight: 500;
  line-height: 1.35;
  color: var(--paper);
  text-decoration: none;
  word-break: break-word;
  border-bottom: 2px solid transparent;
  transition: color .28s var(--ease), border-color .28s var(--ease);
}
.page-contact a.co-contact__val:hover,
.page-contact a.co-contact__val:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
  outline: none;
}
.page-contact .co-contact__val--plain {
  color: var(--paper-soft);
}
.page-contact .co-contact__note {
  margin: 0;
  padding-top: 20px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  padding: 52px 0 72px;
  border-top: 1px solid var(--line);
}
.page-contact .co-faq__item {
  border-bottom: 1px solid var(--line);
}
.page-contact .co-faq__item:first-child {
  border-top: 1px solid var(--line);
}
.page-contact .co-faq__item > summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 4px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--paper);
  transition: color .28s var(--ease), box-shadow .28s var(--ease);
}
.page-contact .co-faq__item > summary::-webkit-details-marker {
  display: none;
}
.page-contact .co-faq__item > summary:hover,
.page-contact .co-faq__item > summary:focus-visible {
  color: var(--cyan-400);
  box-shadow: inset 3px 0 0 0 var(--cyan-400);
  outline: none;
}
.page-contact .co-faq__mark {
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan-400);
  transition: transform .28s var(--ease);
}
.page-contact .co-faq__item[open] .co-faq__mark {
  transform: rotate(45deg);
}
.page-contact .co-faq__body {
  padding: 0 4px 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}
.page-contact .co-faq__body p {
  margin: 0;
  max-width: 62ch;
}
.page-contact .co-faq__more {
  margin: 30px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}
.page-contact .co-faq__more a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 240, 208, .4);
  transition: border-color .28s var(--ease);
}
.page-contact .co-faq__more a:hover,
.page-contact .co-faq__more a:focus-visible {
  border-bottom-color: var(--cyan-400);
  outline: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .co-prep__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .page-contact .co-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }
  .page-contact .co-step {
    padding: 28px 22px 30px;
    border-right: 0;
  }
  .page-contact .co-step:last-child {
    border-right: 1px solid var(--line);
  }
  .page-contact .co-step + .co-step::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    width: 9px;
    height: 9px;
    transform: translate(-50%, -50%) rotate(45deg);
    background: var(--cyan-400);
    z-index: 2;
  }
}

@media (min-width: 900px) {
  .page-contact .co-flow,
  .page-contact .co-fit,
  .page-contact .co-prep,
  .page-contact .co-faq {
    padding: 84px 0;
  }
  .page-contact .co-faq {
    padding-bottom: 96px;
  }
  .page-contact .co-contact {
    padding: 96px 0 88px;
  }
  .page-contact .co-fit__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 56px;
  }
  .page-contact .co-contact__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
  }
}

@media (min-width: 960px) {
  .page-contact .co-hero__inner {
    padding: 28px var(--step) 76px;
  }
  .page-contact .co-hero .breadcrumb {
    margin-bottom: 42px;
  }
  .page-contact .co-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }
  .page-contact .co-hero .lede {
    font-size: 17px;
  }
  .page-contact .co-dir > summary {
    grid-template-columns: 48px minmax(0, 1fr) 24px;
    min-height: 96px;
    padding: 16px 10px;
  }
  .page-contact .co-dir__name {
    font-size: 24px;
  }
  .page-contact .co-dir__body {
    padding: 0 10px 28px 68px;
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-dir__sign,
  .page-contact .co-faq__mark {
    transition: none;
  }
}
</