.page-contact {
  --pc-shadow: 6px 6px 0 var(--c-deep);
  --pc-shadow-hover: 6px 6px 0 rgba(41, 224, 214, 0.22);
  background: var(--c-abyss);
  color: var(--c-mist);
  font-family: var(--font-body);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-contact h1,
.page-contact h2,
.page-contact h3 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-mist);
}

.page-contact a:focus-visible,
.page-contact input:focus-visible,
.page-contact button:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

/* 面包屑 */
.page-contact .breadcrumb {
  padding-top: clamp(16px, 2vw, 26px);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}
.page-contact .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-contact .breadcrumb li + li::before {
  content: "/";
  padding: 0 10px;
  color: var(--c-rule);
}
.page-contact .breadcrumb a {
  color: var(--c-grey);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-contact .breadcrumb a:hover {
  color: var(--c-cyan);
}
.page-contact .breadcrumb [aria-current="page"] {
  color: var(--c-cyan);
}

/* 首屏 */
.page-contact .contact-hero {
  padding-top: clamp(24px, 4vw, 48px);
}
.page-contact .contact-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-coral);
}
.page-contact h1 {
  max-width: 20ch;
  margin: 0 0 22px;
  font-size: clamp(34px, 6.4vw, 80px);
  line-height: 1.03;
}
.page-contact .contact-hero__lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(16px, 1.4vw, 17.5px);
  line-height: 1.75;
  color: var(--c-mist);
  opacity: 0.86;
}
.page-contact .contact-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  background: var(--c-rule);
  border: 1px solid var(--c-rule);
}
.page-contact .contact-hero__facts > div {
  background: var(--c-abyss);
  padding: 16px 18px;
}
.page-contact .contact-hero__facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-grey);
}
.page-contact .contact-hero__facts dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2vw, 21px);
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}
.page-contact .contact-hero__media {
  margin-top: clamp(28px, 4vw, 52px);
  aspect-ratio: 2 / 1;
  border: 2px solid var(--c-rule);
  box-shadow: var(--pc-shadow);
}
.page-contact .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-contact .media-frame__cap {
  color: var(--c-grey);
}

/* 图版基础节奏 */
.page-contact .plate {
  margin-top: clamp(56px, 8vw, 104px);
}
.page-contact .plate__head {
  max-width: 74ch;
}
.page-contact .plate__index {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.page-contact .plate__title {
  margin: 0 0 16px;
  font-size: clamp(26px, 3.4vw, 46px);
  line-height: 1.12;
}
.page-contact .plate__lede {
  max-width: 62ch;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--c-mist);
  opacity: 0.84;
}
.page-contact .plate__note {
  max-width: 68ch;
  margin: 20px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-grey);
}

/* A 联络通道 */
.page-contact .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(28px, 4vw, 48px);
}
.page-contact .channel {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--c-panel);
  border: 2px solid var(--c-rule);
  padding: 26px 22px 24px;
  box-shadow: var(--pc-shadow);
  transition: border-color 0.22s ease, box-shadow 0.22s ease, transform 0.22s ease;
}
.page-contact .channel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--c-cyan) 0 10px, transparent 10px 20px);
  opacity: 0.75;
}
.page-contact .channel:hover,
.page-contact .channel:focus-within {
  border-color: var(--c-cyan);
  box-shadow: var(--pc-shadow-hover);
  transform: translate(-2px, -2px);
}
.page-contact .channel__code {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-coral);
}
.page-contact .channel__name {
  margin: 0 0 14px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--c-grey);
}
.page-contact .channel__value {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(16px, 2.1vw, 20px);
  line-height: 1.45;
  color: var(--c-cyan);
  overflow-wrap: anywhere;
  user-select: all;
}
.page-contact .channel__use {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-mist);
}
.page-contact .channel__tips {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--c-grey);
}
.page-contact .channel__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--c-rule);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-grey);
}

/* B 反馈格式 */
.page-contact .feedback__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
  margin-top: clamp(28px, 4vw, 48px);
}
.page-contact .checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-rule);
}
.page-contact .checklist li {
  border-bottom: 1px solid var(--c-rule);
  transition: background 0.2s ease;
}
.page-contact .checklist li:has(input:checked) {
  background: rgba(41, 224, 214, 0.07);
}
.page-contact .check-item {
  display: grid;
  grid-template-columns: 20px 24px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 16px 8px 16px 4px;
  cursor: pointer;
}
.page-contact .check-item input {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  margin: 3px 0 0;
  border: 2px solid var(--c-rule);
  background: var(--c-abyss);
  position: relative;
  cursor: pointer;
  transition: border-color 0.18s ease;
}
.page-contact .check-item input:checked {
  border-color: var(--c-cyan);
}
.page-contact .check-item input:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(42deg);
}
.page-contact .check-item__no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-teal);
  font-variant-numeric: tabular-nums;
}
.page-contact .check-item__text {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--c-mist);
}
.page-contact .check-item__text strong {
  color: var(--c-cyan);
  font-weight: 700;
}
.page-contact .template {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--c-coral);
  background: linear-gradient(90deg, rgba(255, 107, 74, 0.12), rgba(255, 107, 74, 0));
}
.page-contact .template__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-coral);
}
.page-contact .template__body {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
  overflow-wrap: anywhere;
}
.page-contact .feedback__media {
  border: 2px solid var(--c-rule);
  box-shadow: var(--pc-shadow);
}

/* C 响应节奏 */
.page-contact .rhythm__list {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--c-rule);
}
.page-contact .rhythm__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--c-rule);
}
.page-contact .rhythm__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-teal);
}
.page-contact .rhythm__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2vw, 22px);
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
}
.page-contact .rhythm__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-grey);
}

/* D 受理边界 */
.page-contact .boundary-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--c-rule);
  border: 1px solid var(--c-rule);
}
.page-contact .boundary-list li {
  background: var(--c-abyss);
  padding: 22px 20px;
}
.page-contact .boundary-list h3 {
  margin: 0 0 10px;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--c-coral);
}
.page-contact .boundary-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-grey);
}
.page-contact .boundary-foot {
  max-width: 72ch;
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-grey);
}
.page-contact .boundary-foot a,
.page-contact .cite__list a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--c-rule);
  transition: border-color 0.2s ease;
}
.page-contact .boundary-foot a:hover,
.page-contact .cite__list a:hover {
  border-bottom-color: var(--c-cyan);
}

/* E 引用与转载 */
.page-contact .cite__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(26px, 4vw, 44px);
}
.page-contact .cite__aside {
  border-left: 2px solid var(--c-cyan);
  padding-left: 16px;
}
.page-contact .cite__aside p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--c-grey);
  overflow-wrap: anywhere;
}
.page-contact .cite__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-contact .cite__list li {
  padding: 0 0 18px;
  border-bottom: 1px solid var(--c-rule);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-mist);
}
.page-contact .cite__list li + li {
  padding-top: 18px;
}
.page-contact .cite__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

/* 响应式 */
@media (min-width: 720px) {
  .page-contact .contact-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-contact .boundary-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .rhythm__row {
    grid-template-columns: 180px 240px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-contact .feedback__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  }
  .page-contact .cite__grid {
    grid-template-columns: 260px minmax(0, 1fr);
  }
}