.page-contact {
  --co-soft: #C7D3EB;
  --co-ink-soft: #33456B;
  --co-card-hover: #17315F;
  --co-gap: 20px;
  background: var(--ink-0);
  color: var(--moon);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: clip;
}

.page-contact .co-shell {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(18px, 3vw, 36px) clamp(16px, 3.5vw, 48px) 0;
}

.page-contact h1,
.page-contact h2,
.page-contact h3 {
  font-family: var(--font-display);
  color: var(--moon);
}

/* ---------- 面包屑 ---------- */
.page-contact .co-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--dust);
  letter-spacing: 0.04em;
  padding-bottom: clamp(22px, 4vw, 42px);
}

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

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

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  position: relative;
  padding-bottom: clamp(34px, 6vw, 72px);
  border-bottom: 1px solid var(--ink-2);
}

.page-contact .co-hero::before {
  content: "";
  position: absolute;
  left: -8%;
  top: 4%;
  width: 62%;
  height: 92%;
  background: radial-gradient(ellipse at top left, rgba(108, 74, 182, 0.34), rgba(11, 27, 58, 0) 62%);
  pointer-events: none;
}

.page-contact .co-hero > * {
  position: relative;
}

.page-contact h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 5.6vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.01em;
  max-width: 17em;
}

.page-contact .co-h1-accent {
  color: var(--cyan);
}

.page-contact .co-lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--co-soft);
}

.page-contact .co-hero-facts {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .co-hero-facts li {
  border-left: 2px solid var(--ink-2);
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--co-soft);
}

.page-contact .co-hero-facts .num {
  display: block;
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  line-height: 1.1;
  margin-bottom: 2px;
  color: var(--cyan);
}

.page-contact .co-hero-facts .num--orange {
  color: var(--orange);
}

/* ---------- 四步流程带 ---------- */
.page-contact .co-flow {
  padding: clamp(34px, 6vw, 72px) 0;
}

.page-contact .co-flow-head h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.3vw, 34px);
  font-weight: 700;
  line-height: 1.15;
}

.page-contact .co-flow-intro {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15px;
  color: var(--co-soft);
}

.page-contact .co-flow-grid {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-contact .co-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-contact .co-steps::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 18px;
  bottom: 22px;
  border-left: 1px dashed var(--ink-2);
}

.page-contact .co-step {
  position: relative;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 22px;
  outline-offset: 6px;
}

.page-contact .co-step:last-child {
  padding-bottom: 0;
}

.page-contact .co-step-dot {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--ink-2);
  background: var(--ink-1);
  color: var(--cyan);
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-contact .co-step:hover .co-step-dot,
.page-contact .co-step:focus .co-step-dot,
.page-contact .co-step:focus-within .co-step-dot {
  transform: scale(1.12);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12);
}

.page-contact .co-step-title {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
}

.page-contact .co-step-text {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--co-soft);
}

.page-contact .co-step-extra {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 220ms var(--ease), opacity 220ms var(--ease), margin-top 220ms var(--ease);
}

.page-contact .co-step:hover .co-step-extra,
.page-contact .co-step:focus .co-step-extra,
.page-contact .co-step:focus-within .co-step-extra {
  max-height: 90px;
  opacity: 1;
  margin-top: 8px;
}

.page-contact .co-flow-figure {
  margin: 0;
}

.page-contact .co-flow-figure .media {
  border: 2px solid var(--ink-2);
  border-radius: 2px;
  overflow: hidden;
  transform: rotate(-1deg);
}

.page-contact .co-flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .co-fig-cap {
  margin: 16px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.55;
  color: var(--dust);
}

/* ---------- 合作方向 + 侧栏 ---------- */
.page-contact .co-directions {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
  padding: clamp(34px, 6vw, 72px) 0 clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--ink-2);
}

.page-contact .co-dir-left h2 {
  margin: 10px 0 6px;
  font-size: clamp(23px, 3.3vw, 34px);
  font-weight: 700;
  line-height: 1.15;
  max-width: 16em;
}

.page-contact .co-card {
  position: relative;
  margin-top: 18px;
  padding: 22px 20px 18px;
  background: var(--ink-1);
  border: 2px solid var(--ink-2);
  border-radius: 3px;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-contact .co-card:hover,
.page-contact .co-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan);
  background: var(--co-card-hover);
}

.page-contact .co-card-star {
  position: absolute;
  top: -7px;
  left: 18px;
  width: 12px;
  height: 12px;
  clip-path: polygon(50% 0%, 61% 35%, 100% 50%, 61% 65%, 50% 100%, 39% 65%, 0% 50%, 39% 35%);
  background: var(--cyan);
}

.page-contact .co-card--channel .co-card-star {
  background: var(--nebula);
}

.page-contact .co-card--team .co-card-star {
  background: var(--orange);
}

.page-contact .co-card-tag {
  display: inline-block;
  margin: 0;
  padding: 2px 9px;
  border: 1px solid var(--ink-2);
  border-radius: 999px;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-contact .co-card--channel .co-card-tag {
  color: #B49CE8;
}

.page-contact .co-card--team .co-card-tag {
  color: var(--orange);
}

.page-contact .co-card-title {
  margin: 12px 0 0;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.25;
}

.page-contact .co-card-text {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--co-soft);
}

.page-contact .co-card-fit {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--ink-2);
  font-size: 13px;
  color: var(--dust);
}

.page-contact .co-card-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-contact .co-side {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-contact .co-checklist {
  padding: 20px 18px 16px;
  border: 2px solid var(--ink-2);
  border-radius: 3px;
  background: var(--ink-1);
}

.page-contact .co-checklist h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.page-contact .co-check-sub {
  margin: 6px 0 16px;
  font-size: 13px;
  color: var(--dust);
}

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

.page-contact .co-todo-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.page-contact .co-todo-box {
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  margin: 5px 0 0;
  accent-color: var(--green);
  cursor: pointer;
}

.page-contact .co-todo-label {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.55;
  color: var(--co-soft);
}

.page-contact .co-todo-idx {
  font-family: var(--font-num);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-contact .co-todo-body strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--moon);
}

.page-contact .co-todo-box:checked + .co-todo-label .co-todo-body strong {
  color: var(--green);
}

.page-contact .co-check-note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--ink-2);
  font-size: 12px;
  color: var(--dust);
}

.page-contact .co-check-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-contact .co-quickcard {
  background: var(--moon);
  color: var(--ink-0);
  border-radius: 3px;
  border-left: 4px solid var(--orange);
  padding: 20px 18px;
}

.page-contact .co-qc-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--ink-0);
}

.page-contact .co-qc-text {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--co-ink-soft);
}

.page-contact .co-qc-mail {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed #B9C6E0;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-0);
  word-break: break-all;
}

.page-contact .co-qc-note {
  margin: 6px 0 0;
  font-size: 12px;
  color: #4A5C82;
}

.page-contact .co-band-figure {
  grid-column: 1 / -1;
  margin: clamp(6px, 1.5vw, 14px) 0 0;
}

.page-contact .co-band-figure .media {
  border: 2px solid var(--ink-2);
  border-radius: 2px;
  overflow: hidden;
}

.page-contact .co-band-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .co-band-cap {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--dust);
}

/* ---------- 对接支持 ---------- */
.page-contact .co-support {
  padding: clamp(34px, 6vw, 72px) 0;
  border-top: 1px solid var(--ink-2);
}

.page-contact .co-support h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.3vw, 34px);
  font-weight: 700;
  line-height: 1.15;
}

.page-contact .co-support-grid {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  gap: 14px;
}

.page-contact .co-sup {
  padding: 18px 16px;
  border: 1px solid var(--ink-2);
  border-top: 3px solid var(--nebula);
  border-radius: 3px;
  background: linear-gradient(160deg, rgba(108, 74, 182, 0.18), rgba(20, 42, 85, 0.92) 62%);
}

.page-contact .co-sup:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-contact .co-sup:nth-child(2) {
  border-top-color: var(--nebula);
}

.page-contact .co-sup:nth-child(3) {
  border-top-color: var(--orange);
}

.page-contact .co-sup:nth-child(4) {
  border-top-color: var(--green);
}

.page-contact .co-sup-num {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--dust);
}

.page-contact .co-sup-title {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
}

.page-contact .co-sup-text {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--co-soft);
}

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  padding: clamp(34px, 6vw, 72px) 0;
  border-top: 1px solid var(--ink-2);
}

.page-contact .co-faq h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.3vw, 34px);
  font-weight: 700;
  line-height: 1.15;
}

.page-contact .co-faq-list {
  margin-top: clamp(18px, 3vw, 26px);
  display: grid;
  gap: 10px;
  max-width: 58em;
}

.page-contact .co-faq-item {
  border: 1px solid var(--ink-2);
  border-radius: 3px;
  background: var(--ink-1);
}

.page-contact .co-faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--moon);
}

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

.page-contact .co-faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-contact .co-faq-item p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  color: var(--co-soft);
}

.page-contact .co-faq-item p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-contact .co-faq-item p a:hover,
.page-contact .co-faq-item p a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 联系渠道 ---------- */
.page-contact .co-channels {
  padding: clamp(34px, 6vw, 72px) 0 clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--ink-2);
}

.page-contact .co-channels h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.3vw, 34px);
  font-weight: 700;
  line-height: 1.15;
}

.page-contact .co-ch-grid {
  margin-top: clamp(18px, 3vw, 26px);
  display: grid;
  gap: 12px;
}

.page-contact .co-ch {
  padding: 16px;
  border: 1px solid var(--ink-2);
  border-left: 2px solid var(--cyan);
  border-radius: 2px;
  background: rgba(20, 42, 85, 0.62);
}

.page-contact .co-ch:nth-child(2) {
  border-left-color: var(--orange);
}

.page-contact .co-ch:nth-child(4) {
  border-left-color: var(--green);
}

.page-contact .co-ch-label {
  margin: 0;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--dust);
}

.page-contact .co-ch-value {
  margin: 8px 0 0;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--moon);
  word-break: break-word;
}

.page-contact .co-ch-use {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--co-soft);
}

/* ---------- 收束 ---------- */
.page-contact .co-end {
  position: relative;
  height: 80px;
}

.page-contact .co-end::after {
  content: "";
  position: absolute;
  left: 0;
  right: 38%;
  bottom: 30px;
  border-top: 1px dashed var(--ink-2);
  transform: rotate(-3deg);
  transform-origin: left center;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-contact .co-hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 900px) {
  .page-contact .co-flow-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-contact .co-directions {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.82fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-contact .co-support-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-step-dot,
  .page-contact .co-step-extra,
  .page-contact .co-card,
  .page-contact .co-crumbs a,
  .page-contact .co-card-link {
    transition: none;
  }

  .page-contact .co-step:hover .co-step-dot,
  .page-contact .co-step:focus .co-step-dot,
  .page-contact .co-step:focus-within .co-step-dot,
  .page-contact .co-card:hover,
  .page-contact .co-card:focus-within {
    transform: none;
  }

  .page-contact .co-flow-figure .media,
  .page-contact .co-end::after {
    transform: none;
  }
}