.page-contact {
  --contact-tint: color-mix(in srgb, var(--color-primary-soft) 58%, var(--color-surface));
  --contact-edge: color-mix(in srgb, var(--color-primary) 38%, var(--color-line));
}

.page-contact .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-contact h2,
.page-contact h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-contact h2 { font-size: var(--text-2xl); }
.page-contact h3 { font-size: var(--text-lg); }

.page-contact a {
  color: var(--color-primary);
  text-underline-offset: 3px;
}

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

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  padding-bottom: 0;
}

.page-contact .hero-strip {
  margin: 0 0 var(--space-6);
}

.page-contact .hero-strip img {
  display: block;
  width: 100%;
  height: clamp(160px, 24vw, 400px);
  object-fit: cover;
}

.page-contact .hero-copy {
  max-width: 900px;
}

.page-contact .hero-copy h1 {
  margin: var(--space-2) 0 var(--space-4);
  max-width: 24em;
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-contact .hero-lead {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-contact .section-head {
  max-width: 66ch;
  margin-bottom: var(--space-6);
}

.page-contact .section-note {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 渠道面板 ---------- */
.page-contact .channel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gutter);
}

.page-contact .ch-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.page-contact .ch-card:hover,
.page-contact .ch-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--contact-edge);
  box-shadow: var(--shadow-1);
}

.page-contact .ch-card--lead {
  background: var(--contact-tint);
  border-color: var(--contact-edge);
}

.page-contact .ch-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.page-contact .ch-head h3 {
  margin: 0;
}

.page-contact .ch-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1.35;
  color: var(--color-primary);
  overflow-wrap: anywhere;
}

.page-contact .ch-card--lead .ch-value {
  font-size: var(--text-2xl);
}

.page-contact .ch-desc {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-contact .ch-topics {
  list-style: none;
  margin: var(--space-1) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
  max-height: 4.2em;
  overflow: hidden;
  transition: max-height 260ms ease;
}

.page-contact .ch-card:hover .ch-topics,
.page-contact .ch-card:focus-within .ch-topics {
  max-height: 22em;
}

.page-contact .ch-topics li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink);
}

.page-contact .ch-topics li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: var(--space-2);
  height: var(--border-thin);
  background: var(--color-accent);
}

@media (hover: none) {
  .page-contact .ch-topics {
    max-height: none;
    overflow: visible;
  }
}

@media (min-width: 820px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-contact .ch-wide { grid-column: span 7; }
  .page-contact .ch-mid { grid-column: span 5; }

  .page-contact .ch-card {
    padding: var(--space-6);
  }
}

/* ---------- 情形明细条 ---------- */
.page-contact .quiet-slab {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}

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

.page-contact .detail-row {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) 0;
}

.page-contact .detail-row:first-child { padding-top: 0; }
.page-contact .detail-row:last-child { padding-bottom: 0; }

.page-contact .detail-key {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.page-contact .detail-key::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: var(--space-2);
  height: var(--border-thin);
  background: var(--color-primary);
}

.page-contact .detail-val {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

@media (min-width: 760px) {
  .page-contact .quiet-slab {
    padding: var(--space-6);
  }

  .page-contact .detail-row {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: baseline;
    gap: var(--space-4);
    padding: var(--space-4) 0;
  }
}

/* ---------- 双栏说明面板 ---------- */
.page-contact .split-grid {
  display: grid;
  gap: var(--gutter);
}

.page-contact .note-panel {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}

.page-contact .note-panel h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

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

.page-contact .req-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink);
}

.page-contact .req-list li::before {
  counter-increment: req;
  content: counter(req, decimal-leading-zero);
  padding-top: 0.25em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
}

.page-contact .note-tail {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

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

.page-contact .boundary-list li {
  display: grid;
  gap: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-contact .boundary-key {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink);
}

@media (min-width: 900px) {
  .page-contact .split-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-contact .note-panel {
    padding: var(--space-6);
  }
}

/* ---------- 反馈流程 ---------- */
.page-contact .feedback {
  display: grid;
  gap: var(--space-6);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
}

.page-contact .feedback-lead {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-contact .steps {
  display: grid;
  gap: var(--space-2);
}

.page-contact .step {
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.page-contact .step-head {
  margin: 0;
  font-size: inherit;
  font-weight: var(--weight-body);
}

.page-contact .disclosure-trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  font: inherit;
  text-align: left;
  color: var(--color-ink);
  cursor: pointer;
  transition: color 180ms ease;
}

.page-contact .disclosure-trigger[aria-expanded="true"] {
  color: var(--color-primary);
}

.page-contact .step-num {
  font-size: var(--text-xs);
  color: var(--color-accent);
}

.page-contact .step-label {
  font-size: var(--text-base);
  font-weight: 600;
}

.page-contact .disclosure-body {
  max-width: var(--measure);
  padding: 0 var(--space-4) var(--space-4);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-contact .feedback-side {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

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

.page-contact .side-caption {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.65;
  color: var(--color-ink-muted);
}

.page-contact .side-facts {
  margin: 0;
  display: grid;
  gap: var(--space-2);
}

.page-contact .side-facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
}

.page-contact .side-facts dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-contact .side-facts dd {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-align: right;
}

@media (min-width: 1000px) {
  .page-contact .feedback {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-8);
    align-items: start;
    padding: var(--space-8);
  }
}

/* ---------- 收尾说明 ---------- */
.page-contact .closing-note {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}