.page-contact {
  --ct-line: rgba(255, 255, 255, .12);
  --ct-line-soft: rgba(157, 179, 173, .26);
  --ct-glass: rgba(12, 36, 30, .58);
  --ct-cyan-wash: rgba(53, 240, 208, .12);
  --ct-ink: #12100C;
  display: block;
  padding-bottom: clamp(40px, 6vw, 88px);
}

/* ============ 首屏 ============ */
.page-contact .ct-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 56px) clamp(32px, 5vw, 68px);
  overflow: hidden;
}

.page-contact .ct-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -14%;
  width: min(72vw, 720px);
  height: min(72vw, 720px);
  background: radial-gradient(circle, rgba(53, 240, 208, .15), transparent 66%);
  pointer-events: none;
  z-index: 0;
}

.page-contact .ct-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-contact .ct-kicker {
  margin: clamp(20px, 3vw, 38px) 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-contact .ct-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.6vw, 84px);
  line-height: 1.02;
  letter-spacing: -.035em;
  color: var(--text);
  max-width: 16ch;
}

.page-contact .ct-lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .ct-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .ct-hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--muted);
}

.page-contact .ct-fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--cyan);
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 2px;
}

.page-contact .ct-banner {
  position: relative;
  margin: clamp(28px, 4vw, 52px) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--ct-line);
  background: var(--ink-1);
}

.page-contact .ct-banner img {
  display: block;
  width: 100%;
  height: clamp(180px, 32vw, 380px);
  object-fit: cover;
}

.page-contact .ct-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 18, 15, .08) 0%, rgba(6, 18, 15, .78) 100%);
  pointer-events: none;
}

.page-contact .ct-banner-note {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: 11px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan);
  background: rgba(6, 18, 15, .66);
  border-top: 1px solid var(--ct-line);
  border-right: 1px solid var(--ct-line);
  border-top-right-radius: var(--radius-md);
}

/* ============ 通用区块骨架 ============ */
.page-contact .ct-section {
  padding-block: clamp(44px, 6.5vw, 92px);
}

.page-contact .ct-directions {
  background: linear-gradient(180deg, transparent 0%, rgba(12, 36, 30, .62) 14%, rgba(12, 36, 30, .62) 86%, transparent 100%);
}

.page-contact .ct-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-contact .ct-title-2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 50px);
  line-height: 1.1;
  letter-spacing: -.025em;
  color: var(--text);
  max-width: 22ch;
}

.page-contact .ct-lede-2 {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ============ 合作方向：索引切页 ============ */
.page-contact .ct-switch {
  margin-top: clamp(26px, 3.6vw, 46px);
}

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

.page-contact .ct-switch-body {
  display: grid;
  gap: 18px;
}

.page-contact .ct-tabs {
  display: grid;
  gap: 8px;
}

.page-contact .ct-tab {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx name"
    "idx who";
  align-items: center;
  gap: 3px 14px;
  padding: 14px 16px;
  border: 1px solid var(--ct-line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .04);
  cursor: pointer;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-contact .ct-tab-idx {
  grid-area: idx;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--slate);
  transition: color 180ms var(--ease);
}

.page-contact .ct-tab-name {
  grid-area: name;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.3;
  color: var(--text);
  transition: color 180ms var(--ease);
}

.page-contact .ct-tab-who {
  grid-area: who;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  transition: color 180ms var(--ease);
}

.page-contact #ct-coop-1:checked ~ .ct-switch-body .ct-tab[for="ct-coop-1"],
.page-contact #ct-coop-2:checked ~ .ct-switch-body .ct-tab[for="ct-coop-2"],
.page-contact #ct-coop-3:checked ~ .ct-switch-body .ct-tab[for="ct-coop-3"],
.page-contact #ct-coop-4:checked ~ .ct-switch-body .ct-tab[for="ct-coop-4"] {
  background: var(--orange);
  border-color: var(--orange);
}

.page-contact #ct-coop-1:checked ~ .ct-switch-body .ct-tab[for="ct-coop-1"] .ct-tab-idx,
.page-contact #ct-coop-2:checked ~ .ct-switch-body .ct-tab[for="ct-coop-2"] .ct-tab-idx,
.page-contact #ct-coop-3:checked ~ .ct-switch-body .ct-tab[for="ct-coop-3"] .ct-tab-idx,
.page-contact #ct-coop-4:checked ~ .ct-switch-body .ct-tab[for="ct-coop-4"] .ct-tab-idx {
  color: rgba(18, 16, 12, .6);
}

.page-contact #ct-coop-1:checked ~ .ct-switch-body .ct-tab[for="ct-coop-1"] .ct-tab-name,
.page-contact #ct-coop-2:checked ~ .ct-switch-body .ct-tab[for="ct-coop-2"] .ct-tab-name,
.page-contact #ct-coop-3:checked ~ .ct-switch-body .ct-tab[for="ct-coop-3"] .ct-tab-name,
.page-contact #ct-coop-4:checked ~ .ct-switch-body .ct-tab[for="ct-coop-4"] .ct-tab-name {
  color: var(--ct-ink);
}

.page-contact #ct-coop-1:checked ~ .ct-switch-body .ct-tab[for="ct-coop-1"] .ct-tab-who,
.page-contact #ct-coop-2:checked ~ .ct-switch-body .ct-tab[for="ct-coop-2"] .ct-tab-who,
.page-contact #ct-coop-3:checked ~ .ct-switch-body .ct-tab[for="ct-coop-3"] .ct-tab-who,
.page-contact #ct-coop-4:checked ~ .ct-switch-body .ct-tab[for="ct-coop-4"] .ct-tab-who {
  color: rgba(18, 16, 12, .72);
}

.page-contact #ct-coop-1:focus-visible ~ .ct-switch-body .ct-tab[for="ct-coop-1"],
.page-contact #ct-coop-2:focus-visible ~ .ct-switch-body .ct-tab[for="ct-coop-2"],
.page-contact #ct-coop-3:focus-visible ~ .ct-switch-body .ct-tab[for="ct-coop-3"],
.page-contact #ct-coop-4:focus-visible ~ .ct-switch-body .ct-tab[for="ct-coop-4"] {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-contact .ct-panels {
  display: grid;
  gap: 16px;
}

.page-contact .ct-panel {
  display: none;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--ct-line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .04);
}

.page-contact #ct-coop-1:checked ~ .ct-switch-body .ct-panel:nth-child(1),
.page-contact #ct-coop-2:checked ~ .ct-switch-body .ct-panel:nth-child(2),
.page-contact #ct-coop-3:checked ~ .ct-switch-body .ct-panel:nth-child(3),
.page-contact #ct-coop-4:checked ~ .ct-switch-body .ct-panel:nth-child(4) {
  display: block;
}

.page-contact .ct-panel h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 25px);
  line-height: 1.28;
  letter-spacing: -.015em;
  color: var(--text);
  max-width: 24ch;
}

.page-contact .ct-panel p {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 66ch;
}

.page-contact .ct-panel ul {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-contact .ct-panel ul li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.page-contact .ct-panel ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .ct-panel-start {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ct-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--cyan);
}

.page-contact .ct-flow {
  margin: clamp(26px, 3.6vw, 46px) 0 0;
  border: 1px solid var(--ct-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-1);
}

.page-contact .ct-flow img {
  display: block;
  width: 100%;
  height: clamp(170px, 26vw, 300px);
  object-fit: cover;
}

.page-contact .ct-flow figcaption {
  padding: 14px 18px;
  border-top: 1px solid var(--ct-line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--muted);
}

/* ============ 联系方式面板 ============ */
.page-contact .ct-desk-grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 46px);
}

.page-contact .ct-desk-panel {
  border: 1px solid var(--ct-line);
  border-radius: var(--radius-lg);
  background: var(--ct-glass);
  overflow: hidden;
}

.page-contact .ct-desk-row {
  padding: clamp(18px, 2.6vw, 28px);
  border-bottom: 1px solid var(--ct-line);
}

.page-contact .ct-desk-row:last-child {
  border-bottom: 0;
}

.page-contact .ct-desk-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-contact .ct-desk-val {
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(16px, 2.4vw, 26px);
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-contact .ct-desk-row--hot .ct-desk-val {
  border-left-color: var(--orange);
  color: var(--orange);
}

.page-contact .ct-desk-val--small {
  font-size: clamp(13px, 1.5vw, 16px);
  border-left-color: var(--slate);
  color: var(--muted);
}

.page-contact .ct-desk-note {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 邮件建议 ============ */
.page-contact .ct-mail-grid {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  margin-top: clamp(26px, 3.6vw, 46px);
}

.page-contact .ct-mail-list {
  display: grid;
}

.page-contact .ct-mail-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  padding: 18px 0;
  border-top: 1px solid var(--ct-line);
}

.page-contact .ct-mail-item:last-child {
  border-bottom: 1px solid var(--ct-line);
}

.page-contact .ct-mail-idx {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-contact .ct-mail-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.35;
  color: var(--text);
}

.page-contact .ct-mail-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .ct-mail-paper {
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--radius-lg);
}

.page-contact .ct-paper-kicker {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--paper-2);
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--paper-link);
}

.page-contact .ct-draft {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 2;
  color: var(--paper-ink);
  overflow-wrap: anywhere;
}

/* ============ 处理节奏 ============ */
.page-contact .ct-track {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin: clamp(26px, 3.6vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .ct-node {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--ct-line-soft);
}

.page-contact .ct-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 208, .14);
}

.page-contact .ct-node-time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-contact .ct-node h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--text);
}

.page-contact .ct-node-body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ 常见问题 ============ */
.page-contact .ct-faq-list {
  margin-top: clamp(24px, 3.4vw, 42px);
  border-top: 1px solid var(--ct-line);
}

.page-contact .ct-faq-item {
  border-bottom: 1px solid var(--ct-line);
}

.page-contact .ct-faq-item summary {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.5;
  color: var(--text);
  transition: color 180ms var(--ease);
}

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

.page-contact .ct-faq-item summary::marker {
  content: "";
}

.page-contact .ct-faq-item summary:hover {
  color: var(--cyan);
}

.page-contact .ct-faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-contact .ct-faq-body {
  padding-bottom: 22px;
}

.page-contact .ct-faq-body p {
  margin: 0;
  max-width: 76ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ============ 后续入口 ============ */
.page-contact .ct-next {
  padding-block: clamp(36px, 5vw, 72px) clamp(20px, 3vw, 36px);
}

.page-contact .ct-next-list {
  display: grid;
  margin: clamp(22px, 3.2vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ct-line);
}

.page-contact .ct-next-item {
  border-bottom: 1px solid var(--ct-line);
}

.page-contact .ct-next-link {
  display: grid;
  gap: 6px;
  padding: 18px 4px;
  text-decoration: none;
  transition: background-color 180ms var(--ease);
}

.page-contact .ct-next-link:hover {
  background: var(--ct-cyan-wash);
}

.page-contact .ct-next-name {
  justify-self: start;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--text);
  border-bottom: 2px solid transparent;
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}

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

.page-contact .ct-next-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 响应式 ============ */
@media (min-width: 721px) {
  .page-contact .ct-desk-grid {
    grid-template-columns: minmax(240px, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-contact .ct-mail-grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
    align-items: start;
  }

  .page-contact .ct-next-link {
    grid-template-columns: minmax(110px, 180px) minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }
}

@media (min-width: 861px) {
  .page-contact .ct-switch-body {
    grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 42px);
    align-items: start;
  }

  .page-contact .ct-track {
    position: relative;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 48px);
  }

  .page-contact .ct-track::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 9px;
    height: 1px;
    background: var(--ct-line-soft);
  }

  .page-contact .ct-node {
    padding-left: 0;
    padding-top: 32px;
    border-left: 0;
  }

  .page-contact .ct-node::before {
    left: 0;
    top: 5px;
  }
}

@media (max-width: 480px) {
  .page-contact .ct-banner-note {
    font-size: 10px;
    letter-spacing: .1em;
    padding: 9px 12px;
  }

  .page-contact .ct-desk-val {
    padding-left: 11px;
  }

  .page-contact .ct-panel {
    padding: 18px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .ct-tab,
  .page-contact .ct-next-link,
  .page-contact .ct-next-name,
  .page-contact .ct-faq-item summary {
    transition: none;
  }
}