.page-contact {
  --contact-gap: var(--space-2);
  padding-bottom: var(--section-y-lg);
}

.page-contact img {
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-contact .contact-crumb {
  padding-top: var(--space-3);
  padding-bottom: var(--space-2);
}

.page-contact .breadcrumb {
  margin: 0;
}

.page-contact .breadcrumb ol,
.page-contact .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-contact .breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-lead {
  padding-top: var(--space-2);
  padding-bottom: var(--section-y);
}

.page-contact .contact-lead__grid {
  display: grid;
  gap: var(--space-4);
}

.page-contact .contact-lead__copy {
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.page-contact .contact-lead__copy > .sticker {
  justify-self: start;
}

.page-contact .contact-lead__title {
  margin: 0;
  max-width: 18ch;
  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);
}

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

.page-contact .contact-lead__facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: var(--space-2) 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-contact .contact-lead__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: calc(var(--space-1) * 0.75);
  padding: calc(var(--space-1) * 0.75) var(--space-2);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
}

.page-contact .contact-lead__facts .mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
}

/* ---------- 图片与展签 ---------- */
.page-contact .figure {
  position: relative;
  margin: 0;
}

.page-contact .figure__media {
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-deep);
  box-shadow: var(--shadow-2);
}

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

.page-contact .contact-lead__figure .figure__caption {
  position: relative;
  margin: calc(-1 * var(--space-2)) var(--space-4) 0 var(--space-2);
  padding: calc(var(--space-1) * 0.75) var(--space-2);
  background: var(--color-highlight);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  font-size: var(--text-xs);
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--color-ink);
  transform: rotate(-1deg);
}

.page-contact .cadence__figure .figure__caption {
  margin-top: var(--space-2);
  padding-left: var(--space-1);
  border-left: var(--border-thick) solid var(--color-accent);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 渠道条 ---------- */
.page-contact .channel-list {
  display: grid;
  gap: var(--contact-gap);
  margin-top: var(--space-4);
}

.page-contact .channel-strip {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  transition: box-shadow 200ms ease-out, transform 200ms ease-out;
}

.page-contact .channel-strip:hover,
.page-contact .channel-strip[open] {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.page-contact .channel-strip__summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "tag toggle"
    "value value";
  align-items: center;
  gap: var(--space-1) var(--space-2);
  padding: var(--space-3);
  list-style: none;
  cursor: pointer;
}

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

.page-contact .channel-strip__tag {
  grid-area: tag;
  justify-self: start;
}

.page-contact .channel-strip__value {
  grid-area: value;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink);
  overflow-wrap: anywhere;
}

.page-contact .channel-strip__toggle {
  grid-area: toggle;
  position: relative;
  width: calc(var(--space-3) - 2px);
  height: calc(var(--space-3) - 2px);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
}

.page-contact .channel-strip__toggle::before,
.page-contact .channel-strip__toggle::after {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  top: 50%;
  height: 1px;
  background: var(--color-ink-soft);
  transform: translateY(-50%);
}

.page-contact .channel-strip__toggle::after {
  transform: translateY(-50%) rotate(90deg);
  transition: transform 180ms ease-out;
}

.page-contact .channel-strip[open] .channel-strip__toggle::after {
  transform: translateY(-50%) rotate(0deg);
}

.page-contact .channel-strip__body {
  display: grid;
  gap: var(--space-2);
  margin: 0 var(--space-3);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) dashed var(--color-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-contact .channel-strip__body p {
  margin: 0;
}

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

.page-contact .channel-strip__list {
  display: grid;
  gap: calc(var(--space-1) * 0.75);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .channel-strip__list li {
  position: relative;
  padding-left: var(--space-2);
}

.page-contact .channel-strip__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: calc(var(--space-1) * 0.75);
  height: 1px;
  background: var(--color-accent);
}

/* ---------- 响应节奏 ---------- */
.page-contact .cadence-grid {
  display: grid;
  gap: var(--space-4);
}

.page-contact .cadence {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
}

.page-contact .cadence > .sticker {
  justify-self: start;
}

.page-contact .cadence__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-contact .cadence__clock {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: calc(var(--space-1) * 0.75);
  margin: var(--space-1) 0;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-ink);
}

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

.page-contact .cadence__lead {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-contact .cadence__list {
  display: grid;
  gap: var(--space-1);
  margin: var(--space-1) 0 0;
  padding: var(--space-2) 0 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-contact .cadence__list li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: var(--space-2);
  align-items: start;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-contact .cadence__mark {
  display: block;
  width: 12px;
  height: 2px;
  margin-top: 0.72em;
  background: var(--color-contrast-accent);
}

.page-contact .cadence__marginalia {
  margin-top: var(--space-1);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

/* ---------- 旁注 ---------- */
.page-contact .marginalia {
  position: relative;
  display: inline-block;
}

.page-contact .marginalia__trigger {
  padding: 0 0 2px;
  background: none;
  border: 0;
  border-bottom: var(--border-thin) solid currentColor;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: inherit;
  cursor: pointer;
}

.page-contact .marginalia__body {
  position: absolute;
  z-index: 6;
  left: 0;
  top: calc(100% + var(--space-1));
  width: min(340px, 78vw);
  padding: var(--space-2);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms ease-out, visibility 180ms ease-out;
}

.page-contact .marginalia:hover .marginalia__body,
.page-contact .marginalia:focus-within .marginalia__body {
  opacity: 1;
  visibility: visible;
}

/* ---------- 标题建议 ---------- */
.page-contact .subject-list {
  display: grid;
  gap: var(--contact-gap);
  margin-top: var(--space-4);
}

.page-contact .subject-item {
  display: grid;
  gap: var(--space-1);
  align-content: start;
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  transition: box-shadow 200ms ease-out, transform 200ms ease-out;
}

.page-contact .subject-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.page-contact .subject-item__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-accent);
}

.page-contact .subject-item__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-contact .subject-item__desc {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

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

.page-contact .subject-item .btn[data-copied] {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

/* ---------- 适用范围对照 ---------- */
.page-contact .scope-split {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-contact .scope-col {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.page-contact .scope-col--on {
  background: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.page-contact .scope-col--off {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-accent);
}

.page-contact .scope-col__tag {
  margin: 0;
  padding-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
}

.page-contact .scope-col--on .scope-col__tag {
  color: var(--color-contrast-accent);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-contact .scope-col--off .scope-col__tag {
  color: var(--color-accent);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-contact .scope-col__list {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .scope-col__list li {
  position: relative;
  padding-left: var(--space-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-contact .scope-col--on .scope-col__list li {
  color: color-mix(in srgb, var(--color-contrast-ink) 90%, transparent);
}

.page-contact .scope-col--off .scope-col__list li {
  color: var(--color-ink-soft);
}

.page-contact .scope-col__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: calc(var(--space-1) * 0.75);
  height: 2px;
  background: var(--color-contrast-accent);
}

.page-contact .scope-col--off .scope-col__list li::before {
  background: var(--color-accent);
}

/* ---------- 收尾 ---------- */
.page-contact .contact-close__inner {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-primary-soft);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
}

.page-contact .contact-close__inner > .sticker {
  justify-self: start;
}

.page-contact .contact-close__title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

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

.page-contact .contact-close__actions {
  margin-top: var(--space-2);
}

/* ---------- 焦点反馈 ---------- */
.page-contact a:focus-visible,
.page-contact button:focus-visible,
.page-contact summary:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: calc(var(--space-1) / 4);
  border-radius: var(--radius-sm);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-contact .subject-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }

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

@media (min-width: 900px) {
  .page-contact .contact-lead__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
    gap: var(--space-6);
  }

  .page-contact .contact-lead__title {
    font-size: var(--text-4xl);
  }

  .page-contact .channel-list {
    gap: var(--space-3);
  }

  .page-contact .channel-strip:nth-child(1) {
    margin-right: var(--space-4);
  }

  .page-contact .channel-strip:nth-child(2) {
    margin-inline: var(--space-2);
  }

  .page-contact .channel-strip:nth-child(3) {
    margin-left: var(--space-4);
  }

  .page-contact .channel-strip__summary {
    grid-template-columns: minmax(0, 170px) minmax(0, 1fr) auto;
    grid-template-areas: "tag value toggle";
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
  }

  .page-contact .channel-strip__value {
    font-size: var(--text-lg);
  }

  .page-contact .channel-strip__body {
    margin: 0 var(--space-4);
    font-size: var(--text-base);
  }

  .page-contact .contact-close__inner {
    max-width: 940px;
    padding: var(--space-6);
  }
}

@media (min-width: 960px) {
  .page-contact .cadence-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: var(--space-4);
  }

  .page-contact .scope-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-strip,
  .page-contact .subject-item,
  .page-contact .channel-strip__toggle::after,
  .page-contact .marginalia__body {
    transition: none;
  }

  .page-contact .channel-strip:hover,
  .page-contact .channel-strip[open],
  .page-contact .subject-item:hover {
    transform: none;
  }
}