.page-contact {
  --rail-w: 380px;
  --contact-line: var(--stone);
  padding-bottom: 110px;
}

.page-contact [id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-mast {
  padding-top: 26px;
}

.page-contact .contact-head {
  margin-top: 22px;
  max-width: 900px;
}

.page-contact .contact-head__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-contact .contact-head__title span {
  color: var(--lime);
}

.page-contact .contact-head__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-contact .contact-jump {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-contact .contact-jump a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--bone);
  text-decoration: none;
  background: rgba(44, 51, 43, 0.5);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-contact .contact-jump a:hover {
  background: var(--lime);
  color: var(--ink-900);
}

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

.page-contact .contact-hero {
  margin: 36px 0 0;
}

/* ---------- 左右分置 ---------- */
.page-contact .contact-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  margin-top: 46px;
}

/* ---------- 联系面板 ---------- */
.page-contact .contact-rail .panel {
  position: relative;
}

.page-contact .contact-rail .panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--clay), var(--amber) 58%, rgba(20, 23, 18, 0));
}

.page-contact .contact-card__hours {
  margin: 12px 0 24px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-contact .contact-card__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--haze);
}

.page-contact .contact-card .divider {
  margin: 22px 0;
}

.page-contact .contact-mail {
  display: inline-block;
  font-size: clamp(15px, 3.8vw, 18px);
  color: var(--bone);
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
  word-break: break-all;
  transition: color var(--dur) var(--ease), text-decoration-color var(--dur) var(--ease);
}

.page-contact .contact-mail:hover {
  color: var(--amber);
  text-decoration-color: var(--lime);
}

.page-contact .contact-mail:focus-visible,
.page-contact .contact-tel:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}

.page-contact .contact-tel {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(23px, 6.4vw, 30px);
  letter-spacing: 0.07em;
  color: var(--amber);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-contact .contact-tel:hover {
  color: var(--lime);
}

.page-contact .contact-card__hint {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-contact .contact-addr {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bone);
}

.page-contact .contact-icp {
  margin: 24px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

/* ---------- 右侧内容区 ---------- */
.page-contact .contact-flow {
  display: flex;
  flex-direction: column;
  gap: 46px;
  min-width: 0;
}

.page-contact .contact-block__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.26;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-contact .contact-block__lede {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-contact .contact-block__foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--haze);
}

.page-contact .contact-block__foot a,
.page-contact .contact-timeline p a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-contact .contact-block__foot a:focus-visible,
.page-contact .contact-timeline p a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* ---------- 时间轴 ---------- */
.page-contact .contact-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--contact-line);
}

.page-contact .contact-timeline li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px dashed var(--contact-line);
}

.page-contact .contact-timeline__no {
  padding-top: 3px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-contact .contact-timeline h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-contact .contact-timeline p {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 来件要素 ---------- */
.page-contact .send-grid {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-contact .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-contact .checklist label {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: var(--panel);
  border-left: 3px solid var(--contact-line);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-contact .checklist label:hover {
  border-left-color: var(--lime);
  background: rgba(44, 51, 43, 0.6);
}

.page-contact .checklist input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-contact .checklist__mark {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border: 1.5px solid var(--contact-line);
  display: grid;
  place-items: center;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .checklist__mark::after {
  content: "";
  width: 5px;
  height: 10px;
  margin-top: -3px;
  border-right: 2px solid var(--ink-900);
  border-bottom: 2px solid var(--ink-900);
  transform: rotate(45deg) scale(0);
  transform-origin: center;
  transition: transform var(--dur) var(--ease);
}

.page-contact .checklist input:checked + .checklist__mark {
  background: var(--lime);
  border-color: var(--lime);
}

.page-contact .checklist input:checked + .checklist__mark::after {
  transform: rotate(45deg) scale(1);
}

.page-contact .checklist input:focus-visible + .checklist__mark {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-contact .checklist__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-contact .checklist__text strong {
  display: block;
  margin-bottom: 5px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--bone);
}

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

/* ---------- 资料协作 ---------- */
.page-contact .contact-block--coop {
  padding: 26px 22px 30px;
  background: linear-gradient(158deg, rgba(62, 92, 70, 0.45), rgba(20, 23, 18, 0.92) 64%);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-contact .contact-block--coop .contact-block__lede {
  color: var(--bone);
}

.page-contact .coop-stats {
  margin: 28px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-contact .coop-stats > div {
  padding: 14px 12px 16px;
  background: rgba(12, 31, 26, 0.62);
  border-top: 2px solid var(--lime);
}

.page-contact .coop-stats dt {
  font-size: 12px;
  line-height: 1.5;
  color: var(--haze);
}

.page-contact .coop-stats dd {
  margin: 8px 0 0;
  font-size: clamp(24px, 5vw, 32px);
  letter-spacing: 0.02em;
  color: var(--amber);
}

/* ---------- 右下固定入口 ---------- */
.page-contact .contact-return {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--signal);
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  filter: drop-shadow(0 10px 24px rgba(0, 0, 0, 0.45));
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .contact-return:hover {
  background: var(--amber);
  transform: translateY(-3px);
}

.page-contact .contact-return:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-contact .contact-return__arrow {
  font-family: var(--font-mono);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .contact-head__lede {
    font-size: 17px;
  }

  .page-contact .send-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 26px;
  }

  .page-contact .contact-block--coop {
    padding: 32px 34px 36px;
  }

  .page-contact .contact-return {
    right: 28px;
    bottom: 28px;
    padding: 14px 22px;
    font-size: 15px;
  }
}

@media (min-width: 980px) {
  .page-contact {
    padding-bottom: 90px;
  }

  .page-contact .contact-body {
    grid-template-columns: minmax(0, var(--rail-w)) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-contact .contact-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-contact .contact-timeline li {
    grid-template-columns: 44px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-jump a,
  .page-contact .checklist label,
  .page-contact .checklist__mark,
  .page-contact .checklist__mark::after,
  .page-contact .contact-return {
    transition: none;
  }

  .page-contact .checklist__mark::after {
    transform: rotate(45deg) scale(1);
  }

  .page-contact .contact-return:hover {
    transform: none;
  }
}