.page-contact {
  --contact-cut: 10px;
  --contact-gap: 18px;
  display: block;
  background: var(--ink);
}

/* ---------- hero ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: calc(var(--header-h) + 36px) 0 48px;
  background:
    radial-gradient(115% 85% at 88% 0%, rgba(255, 138, 31, 0.15), transparent 58%),
    linear-gradient(180deg, #0A1B2E 0%, #0A1B2E 78%, #0C2039 100%);
  overflow: hidden;
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line) 18%, var(--line) 82%, transparent);
}

.page-contact .contact-hero .breadcrumbs {
  margin-bottom: 26px;
}

.page-contact .contact-hero__grid {
  display: grid;
  gap: 30px;
}

.page-contact .contact-hero__copy h1 {
  margin: 10px 0 16px;
  font-family: var(--font-head);
  font-size: 34px;
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-contact .contact-hero__copy .lead {
  margin: 0 0 26px;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .contact-hero__meta {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  grid-template-columns: 1fr;
}

.page-contact .contact-hero__meta > div {
  padding: 12px 14px;
  background: rgba(16, 38, 61, 0.72);
  border-left: 2px solid var(--accent);
}

.page-contact .contact-hero__meta dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-contact .contact-hero__meta dd {
  margin: 4px 0 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.page-contact .contact-hero__media {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(
    var(--contact-cut) 0,
    100% 0,
    100% calc(100% - var(--contact-cut)),
    calc(100% - var(--contact-cut)) 100%,
    0 100%,
    0 var(--contact-cut)
  );
}

.page-contact .contact-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 通用小节题头 ---------- */
.page-contact .section-head {
  display: grid;
  gap: 12px;
  margin-bottom: 26px;
}

.page-contact .section-head__titles h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
}

.page-contact .section-head .muted {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 通道分流 ---------- */
.page-contact .contact-channels {
  padding: 54px 0 50px;
}

.page-contact .channel-grid {
  display: grid;
  gap: var(--contact-gap);
}

.page-contact .channel-card {
  position: relative;
  padding: 26px 22px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  overflow: hidden;
  clip-path: polygon(
    var(--contact-cut) 0,
    100% 0,
    100% calc(100% - var(--contact-cut)),
    calc(100% - var(--contact-cut)) 100%,
    0 100%,
    0 var(--contact-cut)
  );
  transition: border-color 240ms ease, background-color 240ms ease;
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, transparent 32%, rgba(255, 138, 31, 0.13) 48%, transparent 63%);
  transform: translateX(-105%);
  transition: transform 520ms ease;
  pointer-events: none;
}

.page-contact .channel-card:hover::before,
.page-contact .channel-card:focus-within::before {
  transform: translateX(105%);
}

.page-contact .channel-card:hover {
  border-color: rgba(255, 138, 31, 0.5);
}

.page-contact .channel-card__num {
  display: block;
  margin-bottom: 14px;
  font-size: 38px;
  line-height: 1;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.page-contact .channel-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.page-contact .channel-card > p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .channel-card__faq {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-contact .channel-card__faq summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent);
  list-style: none;
}

.page-contact .channel-card__faq summary::-webkit-details-marker {
  display: none;
}

.page-contact .channel-card__faq summary::after {
  content: " +";
}

.page-contact .channel-card__faq[open] summary::after {
  content: " −";
}

.page-contact .channel-card__faq ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .channel-card__faq li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .channel-card__faq li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--line);
}

/* ---------- 勘误 ---------- */
.page-contact .contact-erratum {
  padding: 50px 0 54px;
}

.page-contact .erratum-grid {
  display: grid;
  gap: 30px;
}

.page-contact .erratum-intro h2 {
  margin: 8px 0 14px;
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
}

.page-contact .erratum-intro > p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .erratum-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-contact .erratum-list li {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.page-contact .erratum-list__num {
  font-size: 20px;
  line-height: 1.4;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.page-contact .erratum-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-contact .erratum-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作方向 ---------- */
.page-contact .contact-partner {
  padding: 50px 0 54px;
  background: linear-gradient(180deg, #0C2039 0%, #0A1B2E 100%);
}

.page-contact .partner-grid {
  display: grid;
  gap: var(--contact-gap);
}

.page-contact .partner-card {
  padding: 22px 20px;
  background: var(--panel-2);
  border-left: 3px solid var(--accent);
}

.page-contact .partner-card .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-contact .partner-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-contact .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 申请材料 ---------- */
.page-contact .contact-kit {
  padding: 50px 0 54px;
}

.page-contact .kit-grid {
  display: grid;
  gap: 28px;
}

.page-contact .kit-intro h2 {
  margin: 8px 0 14px;
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
}

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

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

.page-contact .kit-list__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  background: rgba(16, 38, 61, 0.8);
  border: 1px dashed var(--line);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--contact-cut)),
    calc(100% - var(--contact-cut)) 100%,
    0 100%
  );
}

.page-contact .kit-list__mark {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--green);
}

.page-contact .kit-list__item h3 {
  margin: 0 0 5px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-contact .kit-list__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 联系方式 ---------- */
.page-contact .contact-dock {
  padding: 50px 0 56px;
  background:
    linear-gradient(180deg, #0A1B2E 0%, #071320 100%);
}

.page-contact .dock-grid {
  display: grid;
  gap: 26px;
}

.page-contact .contact-dock__panel {
  padding: 26px 20px;
  background: var(--panel);
  border: 1px dashed var(--line);
}

.page-contact .contact-list {
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-contact .contact-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .contact-row:first-child {
  border-top: 1px solid var(--line);
}

.page-contact .contact-row__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-contact .contact-row__value {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.page-contact .contact-row__value .mono {
  font-size: 15px;
}

.page-contact .copy-btn {
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--accent);
  cursor: pointer;
  transition: background-color 200ms ease, color 200ms ease;
}

.page-contact .copy-btn:hover,
.page-contact .copy-btn:focus-visible {
  color: var(--ink);
  background: var(--accent);
}

.page-contact .contact-dock__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .contact-dock__aside {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-contact .contact-dock__figure {
  margin: 0;
  border: 1px solid var(--line);
  clip-path: polygon(
    var(--contact-cut) 0,
    100% 0,
    100% calc(100% - var(--contact-cut)),
    calc(100% - var(--contact-cut)) 100%,
    0 100%,
    0 var(--contact-cut)
  );
  background: var(--panel-2);
}

.page-contact .contact-dock__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-contact .dock-map {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
  padding: 12px;
  background: rgba(7, 19, 32, 0.6);
  border: 1px solid var(--line);
}

.page-contact .contact-dock__aside .muted {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 延伸入口 ---------- */
.page-contact .contact-more {
  padding: 0 0 64px;
  background: var(--deep);
}

.page-contact .more-row {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-contact .more-link {
  display: grid;
  gap: 4px;
  padding: 18px 16px;
  background: var(--deep);
  text-decoration: none;
  transition: background-color 200ms ease;
}

.page-contact .more-link:hover,
.page-contact .more-link:focus-visible {
  background: var(--panel);
}

.page-contact .more-link__key {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-contact .more-link:hover .more-link__key,
.page-contact .more-link:focus-visible .more-link__key {
  color: var(--accent);
}

.page-contact .more-link__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .contact-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .contact-list .contact-row {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: center;
    gap: 16px;
  }

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

@media (min-width: 860px) {
  .page-contact .contact-hero {
    padding: calc(var(--header-h) + 52px) 0 64px;
  }

  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
    gap: 52px;
  }

  .page-contact .contact-hero__copy h1 {
    font-size: 52px;
    line-height: 1.16;
  }

  .page-contact .section-head {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
    gap: 24px;
  }

  .page-contact .section-head__titles h2 {
    font-size: 30px;
  }

  .page-contact .channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .erratum-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-contact .kit-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    gap: 48px;
    align-items: start;
  }

  .page-contact .dock-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-contact .contact-dock__panel {
    padding: 32px 28px;
  }

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

@media (min-width: 1120px) {
  .page-contact .contact-hero__copy h1 {
    font-size: 56px;
  }

  .page-contact .channel-card {
    padding: 30px 26px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-card::before {
    transition: none;
    transform: translateX(-105%);
  }

  .page-contact .channel-card:hover::before,
  .page-contact .channel-card:focus-within::before {
    transform: translateX(-105%);
  }
}
</main>