.page-contact {
  --contact-gap: clamp(72px, 11vw, 152px);
  --contact-panel-tint: rgba(0, 224, 255, 0.06);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-sans);
}

.page-contact .breadcrumb {
  padding-top: calc(var(--header-h) + 20px);
  font-size: var(--fs-meta);
}

.page-contact .mono,
.page-contact .contact-line__v,
.page-contact .coop-item__k,
.page-contact .stat-num,
.page-contact .contact-index,
.page-contact .sub-card__num {
  font-family: var(--font-mono);
}

/* ---------- 首屏 ---------- */

.page-contact .contact-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 48px) var(--contact-gap);
  overflow: hidden;
  isolation: isolate;
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: -20% -12% 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(38, 51, 61, 0.62) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(38, 51, 61, 0.34) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: radial-gradient(120% 92% at 76% 6%, #000 10%, transparent 70%);
  mask-image: radial-gradient(120% 92% at 76% 6%, #000 10%, transparent 70%);
  opacity: 0.72;
  pointer-events: none;
}

.page-contact .contact-hero__inner {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-contact .contact-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-contact .contact-hero__lede {
  margin: 18px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.78;
}

.page-contact .contact-lines {
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line);
  display: grid;
  gap: 20px;
}

.page-contact .contact-line {
  display: grid;
  gap: 7px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  transition: border-color 180ms var(--ease);
}

.page-contact .contact-line:hover,
.page-contact .contact-line:focus-within {
  border-left-color: var(--cyan);
}

.page-contact .contact-line__k {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-contact .contact-line__v {
  display: block;
  font-size: clamp(0.98rem, 4.3vw, 2.2rem);
  font-weight: 500;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--cyan);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-contact .contact-line__note {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: var(--fs-meta);
  line-height: 1.7;
}

.page-contact .contact-hero__media {
  margin: 0;
  background: var(--panel);
}

/* ---------- 区块骨架 ---------- */

.page-contact .contact-block {
  border-top: 1px solid var(--line);
  padding-block: var(--contact-gap);
}

.page-contact .contact-block--panel {
  background: var(--panel);
}

.page-contact .contact-block--raise {
  background: var(--raise);
}

.page-contact .contact-block__grid {
  display: grid;
  gap: clamp(30px, 6vw, 64px);
}

.page-contact .contact-index {
  display: block;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  line-height: 1;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-contact .contact-block__title {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-contact .contact-block__lede {
  margin: 14px 0 0;
  max-width: 36ch;
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-contact .contact-block__body {
  min-width: 0;
}

.page-contact .contact-block__foot {
  margin: clamp(22px, 3vw, 30px) 0 0;
  color: var(--muted);
  font-size: var(--fs-meta);
  line-height: 1.8;
  max-width: 64ch;
}

.page-contact .contact-block__media {
  margin: 0 0 clamp(26px, 4vw, 38px);
  background: var(--ink);
}

.page-contact .inline-link {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-contact .inline-link:hover {
  color: var(--orange);
}

/* ---------- 01 客服咨询 ---------- */

.page-contact .topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-contact .topic-list__item {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink);
  transition: background-color 200ms var(--ease);
}

.page-contact .topic-list__item:hover {
  background: var(--raise);
}

.page-contact .topic-list__title {
  margin: 14px 0 0;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-contact .topic-list__item p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.page-contact .prep-note {
  margin-top: clamp(24px, 3.4vw, 34px);
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: linear-gradient(180deg, var(--contact-panel-tint), transparent 62%);
}

.page-contact .prep-note__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

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

.page-contact .prep-note__list li {
  position: relative;
  padding-left: 22px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.page-contact .prep-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .prep-note__foot {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: var(--fs-meta);
  line-height: 1.75;
}

/* ---------- 02 合作与数据校正 ---------- */

.page-contact .coop-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-contact .coop-item {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  background: var(--panel);
  outline: none;
  transition: background-color 200ms var(--ease);
}

.page-contact .coop-item:hover,
.page-contact .coop-item:focus {
  background: var(--raise);
}

.page-contact .coop-item:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.page-contact .coop-item__k {
  display: inline-block;
  font-size: var(--fs-meta);
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-contact .coop-item__title {
  margin: 8px 0 0;
  font-size: 1.08rem;
  font-weight: 700;
}

.page-contact .coop-item__desc {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.page-contact .coop-item__detail {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  transition: max-height 240ms var(--ease), opacity 200ms var(--ease), margin-top 240ms var(--ease);
}

.page-contact .coop-item:hover .coop-item__detail,
.page-contact .coop-item:focus .coop-item__detail,
.page-contact .coop-item:focus-within .coop-item__detail {
  max-height: 14rem;
  opacity: 1;
  margin-top: 16px;
}

.page-contact .coop-item__detail-k {
  display: block;
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-contact .coop-item__detail p {
  margin: 8px 0 0;
  color: var(--text);
  font-size: 14px;
  line-height: 1.7;
}

@media (hover: none) {
  .page-contact .coop-item__detail {
    max-height: 14rem;
    opacity: 1;
    margin-top: 16px;
  }
}

/* ---------- 03 终端适配 ---------- */

.page-contact .deploy-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .deploy-list li {
  position: relative;
  padding: 20px 0 20px 26px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-contact .deploy-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-contact .deploy-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 11px;
  height: 2px;
  background: var(--mint);
}

.page-contact .stat-num {
  color: var(--mint);
  font-weight: 500;
}

/* ---------- 04 订阅 ---------- */

.page-contact .sub-grid {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  grid-template-columns: 1fr;
}

.page-contact .sub-card {
  position: relative;
  padding: clamp(22px, 3vw, 30px);
  background: var(--ink);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-contact .sub-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: calc(var(--cut) - 2px);
  width: 2px;
  height: 22px;
  background: var(--orange);
}

.page-contact .sub-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-contact .sub-card__num {
  display: block;
  font-size: var(--fs-meta);
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-contact .sub-card__title {
  margin: 10px 0 0;
  font-size: 1.06rem;
  font-weight: 700;
}

.page-contact .sub-card__desc {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 05 公开信息 ---------- */

.page-contact .info-list {
  margin: 0;
  border: 1px solid var(--line);
}

.page-contact .info-row {
  display: grid;
  gap: 6px;
  padding: 18px clamp(18px, 3vw, 26px);
  border-bottom: 1px solid var(--line);
}

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

.page-contact .info-row dt {
  font-size: var(--fs-meta);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-contact .info-row dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-contact .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 桌面增强 ---------- */

@media (min-width: 760px) {
  .page-contact .topic-list,
  .page-contact .coop-list,
  .page-contact .sub-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .page-contact .info-row {
    grid-template-columns: 160px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }
}

@media (min-width: 940px) {
  .page-contact .contact-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(48px, 6vw, 84px);
  }

  .page-contact .contact-block__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(48px, 6vw, 96px);
  }

  .page-contact .contact-block__head {
    position: sticky;
    top: calc(var(--header-h) + 36px);
    align-self: start;
  }

  .page-contact .contact-block__lede {
    max-width: 30ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}