.page-contact {
  --contact-line: var(--ink-700);
  --contact-gap: 20px;
}

.page-contact .section {
  scroll-margin-top: 96px;
}

/* ============ 首屏 ============ */
.page-contact .contact-hero {
  position: relative;
  background-color: var(--ink-950);
  background-image:
    linear-gradient(rgba(27, 74, 62, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 74, 62, 0.55) 1px, transparent 1px);
  background-size: 52px 52px;
  border-bottom: 4px solid var(--ink-700);
  overflow: hidden;
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 4px;
  background: var(--cyan-400);
}

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

.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: end;
}

.page-contact .contact-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-heading);
  font-size: clamp(32px, 7.4vw, 60px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--neutral-100);
}

.page-contact .contact-hero .lead {
  margin-top: 20px;
  max-width: 60ch;
}

.page-contact .contact-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .contact-hero__quick a {
  display: inline-block;
  padding: 8px 13px;
  border: 2px solid var(--ink-700);
  background: rgba(5, 19, 15, 0.72);
  color: var(--cyan-200);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease;
}

.page-contact .contact-hero__quick a:hover,
.page-contact .contact-hero__quick a:focus-visible {
  border-color: var(--cyan-400);
  background: var(--cyan-400);
  color: var(--ink-950);
}

.page-contact .contact-hero__figure {
  border: 4px solid var(--ink-700);
  border-bottom-color: var(--cyan-400);
  box-shadow: var(--shadow-hard);
  aspect-ratio: 14 / 9;
  margin: 0;
}

.page-contact .contact-hero__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.9) contrast(1.05);
}

/* ============ 通用小标题 ============ */
.page-contact .contact-head {
  max-width: 72ch;
  margin-bottom: 34px;
}

.page-contact .contact-head h2 {
  margin: 10px 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--neutral-100);
}

.page-contact .contact-head--inline {
  margin-bottom: 26px;
}

/* ============ 渠道一览 ============ */
.page-contact .contact-channels {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--contact-gap);
}

.page-contact .contact-channel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  background: var(--ink-900);
  border: 2px solid var(--contact-line);
}

.page-contact .contact-channel--primary {
  background: var(--ink-800);
  border: 4px solid var(--cyan-400);
  box-shadow: var(--shadow-hard);
  padding: 26px 22px;
}

.page-contact .contact-channel--primary::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 26px;
  width: 4px;
  height: 46px;
  background: var(--amber-400);
}

.page-contact .contact-channel h3 {
  margin: 4px 0 0;
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--neutral-100);
}

.page-contact .contact-channel__value {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--amber-400);
  word-break: break-word;
}

.page-contact .contact-channel--primary .contact-channel__value {
  font-size: 20px;
  color: var(--cyan-400);
}

.page-contact .contact-channel__value--plain {
  color: var(--neutral-100);
  font-size: 16px;
}

.page-contact .contact-channel__desc {
  margin: 0;
  color: var(--neutral-400);
  font-size: 15px;
  line-height: 1.72;
}

.page-contact .contact-channel__list {
  margin: 6px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 2px solid var(--ink-700);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-contact .contact-channel__list li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--neutral-100);
  padding-left: 14px;
  border-left: 2px solid var(--ink-700);
}

.page-contact .contact-channel__list .mono {
  display: block;
  color: var(--cyan-200);
  font-size: 12px;
  letter-spacing: 0.1em;
  margin-bottom: 2px;
}

/* ============ 问题分类 ============ */
.page-contact .contact-routing {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-contact .contact-routing__aside h2 {
  margin: 10px 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(24px, 4.4vw, 32px);
  line-height: 1.15;
  font-weight: 900;
  color: var(--neutral-100);
  letter-spacing: -0.01em;
}

.page-contact .contact-routing__figure {
  margin: 26px 0 0;
  aspect-ratio: 3 / 2;
  border: 4px solid var(--ink-700);
  box-shadow: var(--shadow-soft);
}

.page-contact .contact-routing__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-contact .contact-routing__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-contact .route-item {
  background: var(--ink-900);
  border: 2px solid var(--contact-line);
  transition: border-color 160ms ease;
}

.page-contact .route-item[open] {
  border-color: var(--cyan-400);
  box-shadow: var(--shadow-soft);
}

.page-contact .route-item__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 800;
  color: var(--neutral-100);
  transition: background-color 160ms ease, color 160ms ease;
}

.page-contact .route-item__summary::-webkit-details-marker {
  display: none;
}

.page-contact .route-item__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan-400);
}

.page-contact .route-item[open] .route-item__summary {
  background: var(--cyan-400);
  color: var(--ink-950);
}

.page-contact .route-item[open] .route-item__summary::after {
  content: "−";
  color: var(--ink-950);
}

.page-contact .route-item__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  border: 2px solid currentColor;
  font-size: 12px;
  font-weight: 600;
  flex: none;
}

.page-contact .route-item__name {
  flex: 1 1 auto;
}

.page-contact .route-item__hint {
  display: none;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--neutral-400);
}

.page-contact .route-item[open] .route-item__hint {
  color: rgba(5, 19, 15, 0.72);
}

.page-contact .route-item__body {
  padding: 18px 16px 20px;
  border-top: 2px solid var(--ink-700);
}

.page-contact .route-item__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.74;
  color: var(--neutral-400);
}

.page-contact .route-item__fields {
  margin: 0 0 4px;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-contact .route-item__fields li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.66;
  color: var(--neutral-100);
}

.page-contact .route-item__fields li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 2px;
  background: var(--amber-400);
}

.page-contact .route-item__link {
  margin: 4px 0 0;
  font-size: 14px;
}

.page-contact .route-item__link a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 2px solid var(--ink-700);
}

.page-contact .route-item__link a:hover,
.page-contact .route-item__link a:focus-visible {
  border-bottom-color: var(--cyan-400);
}

/* ============ 回复节奏 ============ */
.page-contact .contact-response {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--ink-700);
  border: 2px solid var(--ink-700);
}

.page-contact .contact-response__item {
  background: var(--ink-900);
  padding: 22px 20px;
}

.page-contact .contact-response__item--live {
  background: var(--ink-800);
  border-left: 4px solid var(--cyan-400);
}

.page-contact .contact-response__item--check {
  border-left: 4px solid var(--amber-400);
}

.page-contact .contact-response__time {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--amber-400);
}

.page-contact .contact-response__item--live .contact-response__time {
  color: var(--cyan-400);
}

.page-contact .contact-response__label {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  color: var(--neutral-100);
}

.page-contact .contact-response__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--neutral-400);
}

/* ============ 发信前自查 ============ */
.page-contact .contact-faq {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 900px;
}

.page-contact .faq-item {
  background: var(--ink-900);
  border-left: 4px solid var(--ink-700);
  border-top: 2px solid var(--ink-700);
  border-right: 2px solid var(--ink-700);
  border-bottom: 2px solid var(--ink-700);
  transition: border-color 160ms ease;
}

.page-contact .faq-item[open] {
  border-left-color: var(--cyan-400);
}

.page-contact .faq-item__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--neutral-100);
}

.page-contact .faq-item__summary::-webkit-details-marker {
  display: none;
}

.page-contact .faq-item__summary::before {
  content: "?";
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  border: 2px solid var(--ink-700);
  color: var(--cyan-200);
}

.page-contact .faq-item[open] .faq-item__summary::before {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-950);
}

.page-contact .faq-item__body {
  padding: 0 16px 18px 48px;
}

.page-contact .faq-item__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--neutral-400);
}

.page-contact .contact-faq__more {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--neutral-400);
  max-width: 72ch;
}

.page-contact .contact-faq__more a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 2px solid var(--ink-700);
}

.page-contact .contact-faq__more a:hover,
.page-contact .contact-faq__more a:focus-visible {
  border-bottom-color: var(--cyan-400);
}

/* ============ 站点信息 ============ */
.page-contact .contact-registry__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--ink-700);
  border: 2px solid var(--ink-700);
  margin: 22px 0 0;
}

.page-contact .contact-registry__cell {
  background: var(--ink-800);
  padding: 16px 18px;
}

.page-contact .contact-registry__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--neutral-400);
}

.page-contact .contact-registry__value {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  font-weight: 600;
  color: var(--neutral-100);
  word-break: break-all;
}

.page-contact .contact-registry__note {
  margin: 20px 0 0;
  max-width: 72ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--neutral-400);
  padding-left: 14px;
  border-left: 2px solid var(--ink-700);
}

/* ============ 平板 ============ */
@media (min-width: 720px) {
  .page-contact .contact-channels {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-contact .contact-channel--primary {
    grid-column: 1 / -1;
  }

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

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

  .page-contact .route-item__hint {
    display: inline-block;
  }
}

/* ============ 桌面 ============ */
@media (min-width: 1000px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 52px;
  }

  .page-contact .contact-channels {
    grid-template-columns: 1.65fr 1fr 1fr;
    gap: 24px;
  }

  .page-contact .contact-channel--primary {
    grid-column: auto;
    padding: 30px 28px;
  }

  .page-contact .contact-channel--narrow {
    padding: 22px 18px;
  }

  .page-contact .contact-routing {
    grid-template-columns: 0.92fr 1.08fr;
    gap: 52px;
    align-items: start;
  }

  .page-contact .contact-routing__aside {
    position: sticky;
    top: 108px;
  }

  .page-contact .contact-head {
    margin-bottom: 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-hero__quick a,
  .page-contact .route-item,
  .page-contact .faq-item {
    transition: none;
  }
}