.page-contact {
  --contact-ink: #B23E12;
  --contact-gap: clamp(1rem, 3vw, 1.75rem);
}

/* 首屏：对角切分 + 右侧竖图 */
.page-contact .contact-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 4vw, 2rem) 0 clamp(2rem, 6vw, 3.5rem);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: -20% -6% auto -6%;
  height: 150%;
  background: linear-gradient(116deg,
    rgba(228, 88, 30, 0.17) 0 31%,
    rgba(63, 126, 168, 0.11) 31% 45%,
    transparent 45.2%);
  pointer-events: none;
}

.page-contact .breadcrumb {
  position: relative;
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
}

.page-contact .hero-inner {
  position: relative;
  display: grid;
  gap: var(--contact-gap);
}

.page-contact .hero-copy {
  max-width: 34em;
}

.page-contact .hero-copy .lede {
  margin-top: 0.85rem;
}

.page-contact .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.page-contact .hero-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  padding: 0.4rem 0.7rem;
  font-size: 0.8125rem;
  color: var(--frost-400);
  background: rgba(16, 16, 16, 0.72);
  border: 1px solid var(--char-600);
  border-radius: var(--radius-s);
}

.page-contact .hero-chip .mono {
  color: var(--frost-100);
  font-size: 0.8125rem;
}

.page-contact .hero-chip--key {
  border-color: rgba(247, 183, 51, 0.45);
  color: var(--amber-400);
}

.page-contact .hero-figure {
  margin: 0;
}

.page-contact .hero-figure .media-frame {
  clip-path: polygon(0 2.5%, 100% 0, 100% 100%, 0 97.5%);
}

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

/* 章节通用 */
.page-contact .section {
  padding-block: clamp(2rem, 5vw, 3.25rem);
}

.page-contact .section__head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-contact .section__head .caption {
  margin-top: 0.5rem;
  max-width: 48em;
}

.page-contact .section a {
  color: var(--frost-100);
  text-decoration: underline;
  text-decoration-color: rgba(228, 88, 30, 0.6);
  text-underline-offset: 3px;
}

.page-contact .section a:focus-visible,
.page-contact .copy-btn:focus-visible,
.page-contact .btn:focus-visible {
  outline: 2px solid var(--ember-500);
  outline-offset: 2px;
}

/* 渠道卡 + 邮件模板 双栏 */
.page-contact .contact-grid {
  display: grid;
  gap: var(--contact-gap);
}

.page-contact .channel-stack {
  display: grid;
  gap: var(--contact-gap);
  align-content: start;
}

.page-contact .channel-card {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1.15rem 1.2rem;
  background: var(--char-800);
  border: 1px solid var(--char-600);
  border-radius: var(--radius-l);
  transition: border-color 200ms var(--ease), background 200ms var(--ease),
    transform 200ms var(--ease);
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14%;
  bottom: 14%;
  width: 3px;
  background: var(--ember-500);
  border-radius: 0 3px 3px 0;
  opacity: 0;
  transition: opacity 200ms var(--ease);
}

.page-contact .channel-card:hover,
.page-contact .channel-card:focus-within {
  background: #1F1D1B;
  border-color: rgba(228, 88, 30, 0.75);
  transform: translateY(-2px);
}

.page-contact .channel-card:hover::before,
.page-contact .channel-card:focus-within::before {
  opacity: 1;
}

.page-contact .channel-card__icon {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-m);
  background: rgba(228, 88, 30, 0.13);
  border: 1px solid rgba(228, 88, 30, 0.42);
  color: var(--ember-300);
}

.page-contact .channel-card__body {
  min-width: 0;
}

.page-contact .channel-card__label {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--steel-500);
}

.page-contact .channel-card__value {
  margin: 0.3rem 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--frost-100);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-contact .channel-card__hint {
  margin: 0.5rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--steel-500);
}

.page-contact .channel-card .copy-btn {
  margin-top: 0.85rem;
}

.page-contact .copy-btn[data-copied="true"] {
  border-color: var(--amber-400);
  color: var(--amber-400);
}

/* 邮件模板面板：浅色插页 */
.page-contact .mail-panel {
  padding: clamp(1.15rem, 3vw, 1.75rem);
  background: var(--frost-100);
  border-radius: var(--radius-l);
  border: 1px solid rgba(42, 40, 37, 0.25);
  color: var(--char-800);
}

.page-contact .mail-panel .h-sec {
  color: var(--char-800);
}

.page-contact .mail-panel__rule {
  margin: 0.75rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(26, 25, 23, 0.78);
}

.page-contact .mail-template {
  margin-top: 1rem;
  padding: 0.95rem 1.05rem;
  background: var(--sand-100);
  border-left: 4px solid var(--ember-500);
  border-radius: var(--radius-m);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--char-800);
  overflow-x: auto;
}

.page-contact .mail-line {
  margin: 0;
  white-space: nowrap;
}

.page-contact .mail-key {
  color: var(--contact-ink);
  font-weight: 700;
}

.page-contact .template-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1rem;
}

.page-contact .mail-panel .copy-btn {
  background: var(--char-800);
  border-color: var(--char-800);
  color: var(--frost-100);
}

.page-contact .mail-panel .btn--ghost {
  border-color: var(--char-800);
  color: var(--char-800);
}

.page-contact .mail-panel .btn--ghost:hover {
  border-color: var(--ember-500);
  color: var(--contact-ink);
}

.page-contact .mail-panel__note {
  margin: 0.85rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(26, 25, 23, 0.72);
}

.page-contact .mail-figure {
  margin: 1.15rem 0 0;
}

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

.page-contact .mail-panel .media-frame__caption {
  color: rgba(26, 25, 23, 0.72);
}

/* 勘误与反馈双栏 */
.page-contact .dual {
  display: grid;
  gap: var(--contact-gap);
}

.page-contact .dual__col {
  min-width: 0;
}

.page-contact .dual__title {
  margin: 0 0 0.9rem;
  font-size: 1.0625rem;
  line-height: 1.4;
  color: var(--frost-100);
  padding-left: 0.7rem;
  border-left: 4px solid var(--ember-500);
}

.page-contact .req-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.page-contact .req-list li {
  position: relative;
  padding-left: 1.5rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px dashed var(--char-600);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--frost-400);
}

.page-contact .req-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 0.6rem;
  height: 2px;
  background: var(--ember-500);
}

.page-contact .flow {
  margin: 0 0 0.9rem;
  padding: 0;
  list-style: none;
  counter-reset: flow;
  display: grid;
  gap: 0.85rem;
}

.page-contact .flow li {
  counter-increment: flow;
  position: relative;
  padding-left: 2.6rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--frost-400);
}

.page-contact .flow li::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.05rem;
  padding: 0.1rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--amber-400);
  border: 1px solid var(--char-600);
  border-radius: var(--radius-s);
}

/* 键值列表：合作沟通 / 站点信息 */
.page-contact .kv-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--char-600);
  border: 1px solid var(--char-600);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-contact .kv-item {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 1.1rem;
  background: var(--char-800);
}

.page-contact .kv-item__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--amber-400);
}

.page-contact .kv-item__v {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--frost-400);
}

.page-contact .kv-item__v a {
  color: var(--frost-100);
}

/* 边界清单 */
.page-contact .boundary {
  margin: 0 0 0.9rem;
  padding: 1.05rem 1.15rem 1.05rem 1.6rem;
  list-style: none;
  display: grid;
  gap: 0.7rem;
  background: var(--char-800);
  border: 1px solid var(--char-600);
  border-left: 4px solid var(--ember-500);
  border-radius: var(--radius-m);
}

.page-contact .boundary li {
  position: relative;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--frost-400);
}

.page-contact .boundary li::before {
  content: "×";
  position: absolute;
  left: -1.1rem;
  top: 0;
  color: var(--ember-300);
  font-family: var(--font-mono);
}

.page-contact .reg-note {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--char-600);
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--steel-500);
  max-width: 62em;
}

.page-contact .reg-note a {
  color: var(--frost-100);
}

/* 平板与桌面 */
@media (min-width: 760px) {
  .page-contact .dual {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 2.75rem);
  }

  .page-contact .contact-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-contact .hero-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr);
    align-items: end;
    gap: clamp(1.75rem, 4vw, 3.25rem);
  }

  .page-contact .hero-copy {
    padding-bottom: 1.25rem;
  }

  .page-contact .channel-stack {
    gap: 1rem;
  }
}

@media (min-width: 1180px) {
  .page-contact .contact-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.1fr);
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-card,
  .page-contact .channel-card::before,
  .page-contact .copy-btn {
    transition: none;
  }

  .page-contact .channel-card:hover,
  .page-contact .channel-card:focus-within {
    transform: none;
  }
}