.page-contact {
  --contact-rule: 1px dotted var(--color-line);
}

.page-contact a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dotted var(--color-line);
  transition: color 150ms ease-out, border-color 150ms ease-out;
}

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

.page-contact a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */

.page-contact .contact-intro .breadcrumb {
  margin-bottom: var(--space-6);
}

.page-contact .contact-intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.page-contact .contact-intro__head h1 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-3) 0 var(--space-4);
  max-width: 24ch;
}

.page-contact .contact-intro__lead {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  max-width: 60ch;
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-3);
}

.page-contact .contact-intro__aside {
  padding: var(--space-4);
}

.page-contact .contact-intro__aside-k {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-3);
}

.page-contact .contact-intro__aside-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-contact .contact-intro__aside-list li {
  display: grid;
  gap: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink);
  padding-bottom: var(--space-3);
  border-bottom: var(--contact-rule);
}

.page-contact .contact-intro__aside-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

/* ---------- 气氛图带 ---------- */

.page-contact .contact-band__figure {
  position: relative;
  margin: 0;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
}

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

.page-contact .contact-band__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4);
  font-family: var(--font-body);
}

.page-contact .contact-band__k {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-contact .contact-band__v {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  max-width: 60ch;
}

/* ---------- 渠道总览 ---------- */

.page-contact .contact-channels__lead {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: 60ch;
  margin-top: var(--space-3);
}

.page-contact .contact-channels__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-6);
}

.page-contact .channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--contact-rule);
}

.page-contact .channel-item {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: var(--space-1) var(--space-3);
  padding: var(--space-4) var(--space-2) var(--space-4) var(--space-3);
  border-bottom: var(--contact-rule);
  transition: background-color 150ms ease-out;
}

.page-contact .channel-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-4);
  width: 3px;
  height: 20px;
  background: transparent;
  transition: background-color 150ms ease-out;
}

.page-contact .channel-item:hover {
  background-color: var(--color-surface-alt);
}

.page-contact .channel-item:hover::before {
  background-color: var(--color-accent);
}

.page-contact .channel-item__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  padding-top: 3px;
}

.page-contact .channel-item__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
}

.page-contact .channel-item__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-ink);
  margin: 0;
}

.page-contact .channel-item__value {
  align-self: flex-start;
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-sm);
  padding: 3px var(--space-2);
  word-break: break-word;
}

.page-contact .channel-item__field {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: var(--space-2);
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink);
}

.page-contact .channel-item__key {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  padding-top: 3px;
}

/* ---------- 折叠 ---------- */

.page-contact details {
  margin-top: var(--space-1);
}

.page-contact details > summary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  border-bottom: var(--contact-rule);
  padding-bottom: 2px;
  transition: color 150ms ease-out, border-color 150ms ease-out;
}

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

.page-contact details > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
}

.page-contact details[open] > summary::before {
  content: "−";
}

.page-contact details > summary:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-contact details > summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-contact details > p {
  margin: var(--space-3) 0 0;
  max-width: 62ch;
  font-size: var(--text-sm);
  line-height: 1.67;
  color: var(--color-ink);
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-3);
}

/* ---------- 侧栏 ---------- */

.page-contact .contact-channels__aside {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.page-contact .contact-channels__figure {
  display: block;
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.page-contact .contact-channels__panel {
  padding: var(--space-4);
}

.page-contact .contact-channels__panel-k {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.page-contact .contact-channels__panel p:last-child {
  font-size: var(--text-sm);
  line-height: 1.67;
  color: var(--color-ink);
  margin: 0;
}

/* ---------- 反色问题边界 ---------- */

.page-contact .contact-scope .section-head h2 {
  color: var(--color-contrast-ink);
}

.page-contact .contact-scope__eyebrow {
  color: var(--color-contrast-accent);
}

.page-contact .contact-scope__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.page-contact .contact-scope__label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-contrast-ink);
  margin-bottom: var(--space-4);
}

.page-contact .contact-scope__col--no .contact-scope__label {
  color: var(--color-contrast-ink);
  opacity: 0.62;
}

.page-contact .contact-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-contact .contact-scope__list li {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  padding-bottom: var(--space-3);
  border-bottom: 1px dotted var(--color-contrast-line);
}

.page-contact .contact-scope__list li::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1.2;
  color: var(--color-contrast-accent);
}

.page-contact .contact-scope__col--no .contact-scope__list li::before {
  content: "–";
  color: var(--color-contrast-ink);
  opacity: 0.55;
}

.page-contact .contact-scope .contact-scope__note > summary {
  color: var(--color-contrast-ink);
  border-bottom: 1px dotted var(--color-contrast-line);
  opacity: 0.78;
}

.page-contact .contact-scope .contact-scope__note > summary::before {
  color: var(--color-contrast-accent);
}

.page-contact .contact-scope .contact-scope__note > summary:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
  opacity: 1;
}

.page-contact .contact-scope .contact-scope__note > p {
  color: var(--color-contrast-ink);
  border-left-color: var(--color-contrast-accent);
}

/* ---------- 备案与说明 ---------- */

.page-contact .contact-foot__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: end;
}

.page-contact .contact-foot__main h2 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-3) 0 var(--space-4);
}

.page-contact .contact-foot__main p {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  max-width: var(--measure);
  margin-bottom: var(--space-3);
}

.page-contact .contact-foot__main p:last-child {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  margin-bottom: 0;
}

.page-contact .contact-foot__meta {
  border-top: var(--contact-rule);
  padding-top: var(--space-3);
}

.page-contact .contact-foot__meta-k {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}

.page-contact .contact-foot__icp {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ---------- 窄屏适配 ---------- */

@media (max-width: 560px) {
  .page-contact .channel-item {
    grid-template-columns: 26px minmax(0, 1fr);
    padding-left: var(--space-2);
  }

  .page-contact .channel-item__field {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-1);
  }

  .page-contact .channel-item__key {
    padding-top: 0;
  }

  .page-contact .contact-intro__lead {
    border-left-width: 2px;
    padding-left: var(--space-2);
  }

  .page-contact .contact-band__body {
    padding: var(--space-3);
  }
}

@media (min-width: 760px) {
  .page-contact .contact-intro__head h1 {
    font-size: var(--text-4xl);
  }

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

  .page-contact .contact-foot__meta {
    text-align: right;
  }

  .page-contact .contact-foot__icp {
    text-align: right;
  }
}

@media (min-width: 960px) {
  .page-contact .contact-intro__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: var(--space-8);
  }

  .page-contact .contact-channels__grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: var(--space-8);
  }

  .page-contact .channel-item {
    grid-template-columns: 48px minmax(0, 1fr);
    padding-right: var(--space-4);
  }

  .page-contact .contact-scope__cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0;
  }

  .page-contact .contact-scope__col {
    padding: 0 var(--space-6);
  }

  .page-contact .contact-scope__col:first-child {
    padding-left: 0;
  }

  .page-contact .contact-scope__col:last-child {
    padding-right: 0;
    border-left: 1px dotted var(--color-contrast-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact *,
  .page-contact *::before,
  .page-contact *::after {
    transition-duration: 0ms !important;
  }
}