.page-contact {
  --pc-card-radius: 16px 3px 16px 3px;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-contact .pc-hero {
  position: relative;
  padding: 26px 0 76px;
  background:
    radial-gradient(ellipse 70% 90% at 88% 0%, rgba(43, 232, 176, 0.16), transparent 62%),
    radial-gradient(ellipse 60% 70% at 4% 100%, rgba(230, 57, 70, 0.14), transparent 65%),
    var(--pitch-900);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 42px), 0 100%);
  overflow: hidden;
}

.page-contact .pc-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  opacity: 0.7;
}

.page-contact .pc-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-contact .pc-hero .breadcrumbs {
  color: var(--moss);
  margin-bottom: 40px;
}

.page-contact .pc-hero .breadcrumbs a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-contact .pc-hero .breadcrumbs a:hover,
.page-contact .pc-hero .breadcrumbs a:focus-visible {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

.page-contact .pc-hero__grid {
  display: grid;
  gap: 36px;
}

.page-contact .pc-hero .eyebrow {
  color: var(--teal);
  margin: 0 0 16px;
}

.page-contact .pc-hero__title {
  margin: 0 0 20px;
  font-size: clamp(32px, 7.4vw, 64px);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-contact .pc-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
}

.page-contact .pc-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.page-contact .pc-tag {
  display: inline-block;
  padding: 6px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--moss);
  border: 1px solid var(--pitch-600);
  border-radius: 999px;
}

.page-contact .pc-hero__types {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(201, 214, 207, 0.22);
}

.page-contact .pc-hero__types li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(201, 214, 207, 0.16);
}

.page-contact .pc-hero__types .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex: 0 0 26px;
  font-size: 11px;
  color: var(--pitch-900);
  background: var(--teal);
  border-radius: 50%;
}

/* ---------- 主体双栏 ---------- */
.page-contact .pc-body {
  padding: 48px 0 0;
}

.page-contact .pc-body__wrap {
  display: grid;
  gap: 36px;
}

.page-contact .pc-aside {
  min-width: 0;
}

/* ---------- 联系信息卡 ---------- */
.page-contact .pc-contactcard {
  padding: 24px 20px 8px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--pc-card-radius);
  border-left: 4px solid var(--red);
}

.page-contact .pc-contactcard__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--moss-ink);
}

.page-contact .pc-contactcard__title {
  margin: 0 0 6px;
  font-size: 21px;
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-contact .pc-channels {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-contact .pc-channel {
  padding: 16px 0;
  border-top: 1px dashed var(--line);
}

.page-contact .pc-channel__kind {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--moss-ink);
  margin-bottom: 6px;
}

.page-contact .pc-channel__value {
  display: block;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-contact .pc-channel__note {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss-ink);
}

/* ---------- 右侧分节 ---------- */
.page-contact .pc-main {
  min-width: 0;
}

.page-contact .pc-sec + .pc-sec {
  margin-top: 46px;
  padding-top: 42px;
  border-top: 1px dashed var(--line);
}

.page-contact .pc-sec .section-mark {
  margin-bottom: 18px;
}

.page-contact .pc-sec__intro {
  margin: 0 0 22px;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--moss-ink);
}

.page-contact .pc-sec__foot {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--moss-ink);
}

.page-contact .pc-sec__foot a {
  color: var(--teal-ink);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 180ms var(--ease);
}

.page-contact .pc-sec__foot a:hover,
.page-contact .pc-sec__foot a:focus-visible {
  color: var(--red);
}

/* ---------- 四类来函 ---------- */
.page-contact .pc-letter {
  position: relative;
  margin-top: 12px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--pc-card-radius);
  overflow: hidden;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-contact .pc-letter::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--teal);
  transition: width 220ms var(--ease);
}

.page-contact .pc-letter:hover,
.page-contact .pc-letter[open] {
  border-color: var(--pitch-600);
}

.page-contact .pc-letter:hover::before,
.page-contact .pc-letter[open]::before {
  width: 4px;
}

.page-contact .pc-letter__head {
  display: grid;
  grid-template-columns: 34px 1fr 26px;
  align-items: center;
  gap: 12px;
  padding: 16px 16px 16px 18px;
  cursor: pointer;
  list-style: none;
  outline-offset: -2px;
}

.page-contact .pc-letter__head::-webkit-details-marker {
  display: none;
}

.page-contact .pc-letter__num {
  font-size: 13px;
  color: var(--moss-ink);
}

.page-contact .pc-letter__text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-contact .pc-letter__title {
  font-size: 17px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-contact .pc-letter__who {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--moss-ink);
}

.page-contact .pc-letter__mark {
  position: relative;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: border-color 200ms var(--ease), transform 220ms var(--ease);
}

.page-contact .pc-letter[open] .pc-letter__mark {
  border-color: var(--teal);
  transform: rotate(90deg);
}

.page-contact .pc-letter__mark::before,
.page-contact .pc-letter__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--moss-ink);
  transform: translate(-50%, -50%);
}

.page-contact .pc-letter__mark::before {
  width: 9px;
  height: 1.5px;
}

.page-contact .pc-letter__mark::after {
  width: 1.5px;
  height: 9px;
  transition: opacity 200ms var(--ease);
}

.page-contact .pc-letter[open] .pc-letter__mark::after {
  opacity: 0;
}

.page-contact .pc-letter__body {
  padding: 0 18px 20px 64px;
}

.page-contact .pc-letter__desc {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-contact .pc-letter__req {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--moss-ink);
}

.page-contact .pc-letter__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .pc-letter__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 7px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss-ink);
}

.page-contact .pc-letter__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--pitch-600);
  border-radius: 1px;
  transform: rotate(45deg);
}

.page-contact .pc-badge-row {
  margin: 16px 0 0;
}

.page-contact .pc-badge {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--teal-ink);
  background: rgba(43, 232, 176, 0.12);
  border: 1px solid rgba(43, 232, 176, 0.45);
  border-radius: 999px;
}

.page-contact .pc-badge--warn {
  color: #8a6400;
  background: rgba(255, 195, 0, 0.16);
  border-color: rgba(255, 195, 0, 0.6);
}

/* ---------- 来函三样 ---------- */
.page-contact .pc-attach {
  display: grid;
  gap: 26px;
}

.page-contact .pc-steps {
  list-style: none;
  counter-reset: pcs;
  margin: 0;
  padding: 0;
}

.page-contact .pc-steps > li {
  position: relative;
  counter-increment: pcs;
  padding: 0 0 22px 46px;
}

.page-contact .pc-steps > li:last-child {
  padding-bottom: 0;
}

.page-contact .pc-steps > li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 15px;
  top: 34px;
  bottom: 4px;
  width: 1px;
  background: var(--line);
}

.page-contact .pc-steps > li::before {
  content: counter(pcs, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  box-sizing: border-box;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal-ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 50%;
}

.page-contact .pc-steps__title {
  margin: 2px 0 6px;
  font-size: 15.5px;
  font-weight: 800;
  line-height: 1.4;
}

.page-contact .pc-steps__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--moss-ink);
}

.page-contact .pc-steps--tight > li {
  padding-bottom: 20px;
}

.page-contact .pc-attach__fig {
  margin: 0;
}

.page-contact .pc-attach__fig img,
.page-contact .pc-build__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 内容共建 ---------- */
.page-contact .pc-build {
  display: grid;
  gap: 26px;
}

.page-contact .pc-build__fig {
  position: relative;
  margin: 0;
  aspect-ratio: 12 / 7;
  overflow: hidden;
  border-radius: var(--pc-card-radius);
  border: 1px solid var(--line);
  background: var(--pitch-800);
}

/* ---------- 覆盖范围 ---------- */
.page-contact .pc-tiers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-contact .pc-tier {
  padding: 14px 14px 15px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px 2px 12px 2px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-contact .pc-tier:hover {
  border-color: var(--pitch-600);
  background: #fbfdfb;
}

.page-contact .pc-tier__name {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-contact .pc-tier__desc {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--moss-ink);
}

/* ---------- 引用转载 ---------- */
.page-contact .pc-cite {
  display: grid;
  gap: 16px;
}

.page-contact .pc-cite__item {
  padding: 18px 18px 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--yellow);
  border-radius: 12px 2px 12px 2px;
}

.page-contact .pc-cite__title {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 800;
  line-height: 1.4;
}

.page-contact .pc-cite__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--moss-ink);
}

/* ---------- 底部对接刻度 ---------- */
.page-contact .pc-flow {
  margin-top: 56px;
  padding: 72px 0 60px;
  background: var(--pitch-800);
  color: var(--white);
  clip-path: polygon(0 44px, 100% 0, 100% 100%, 0 100%);
}

.page-contact .pc-flow .section-mark {
  margin-bottom: 30px;
  border-color: rgba(201, 214, 207, 0.3);
}

.page-contact .pc-flow .section-mark__index,
.page-contact .pc-flow .section-mark__name {
  color: var(--white);
}

.page-contact .pc-flow .section-mark__state {
  color: var(--moss);
  border-color: rgba(201, 214, 207, 0.35);
}

.page-contact .pc-flow__track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-contact .pc-flow__track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--teal), rgba(43, 232, 176, 0.12));
}

.page-contact .pc-flow__step {
  position: relative;
  padding-left: 48px;
}

.page-contact .pc-flow__dot {
  position: absolute;
  left: 0;
  top: 0;
  box-sizing: border-box;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11.5px;
  color: var(--teal);
  background: var(--pitch-900);
  border: 1px solid var(--teal);
  border-radius: 50%;
}

.page-contact .pc-flow__title {
  margin: 2px 0 8px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--white);
}

.page-contact .pc-flow__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--moss);
}

.page-contact .pc-flow__note {
  margin: 40px 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(201, 214, 207, 0.25);
  font-size: 14px;
  line-height: 1.8;
  color: var(--moss);
}

.page-contact .pc-flow__note .num {
  color: var(--teal);
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-contact .pc-hero {
    padding: 32px 0 84px;
  }

  .page-contact .pc-contactcard {
    padding: 28px 26px 12px;
  }

  .page-contact .pc-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .pc-letter__head {
    grid-template-columns: 44px 1fr 26px;
    padding: 18px 20px 18px 20px;
  }

  .page-contact .pc-letter__body {
    padding: 0 20px 22px 64px;
  }
}

@media (min-width: 860px) {
  .page-contact .pc-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: end;
    gap: 48px;
  }

  .page-contact .pc-hero__types {
    border-top: 0;
  }

  .page-contact .pc-hero__types li:first-child {
    border-top: 1px solid rgba(201, 214, 207, 0.22);
  }

  .page-contact .pc-attach {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 32px;
  }

  .page-contact .pc-build {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.88fr);
    align-items: start;
    gap: 34px;
  }

  .page-contact .pc-cite {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .pc-cite__item:first-child {
    grid-column: 1 / -1;
  }

  .page-contact .pc-tiers {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-contact .pc-body {
    padding-top: 60px;
  }

  .page-contact .pc-body__wrap {
    grid-template-columns: minmax(280px, 38%) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-contact .pc-aside {
    position: sticky;
    top: calc(var(--header-h) + var(--header-strip) + 20px);
  }

  .page-contact .pc-flow__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-contact .pc-flow__track::before {
    left: 16px;
    right: 16px;
    top: 15px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--teal), rgba(43, 232, 176, 0.14));
  }

  .page-contact .pc-flow__step {
    padding-left: 0;
    padding-top: 56px;
  }

  .page-contact .pc-flow__dot {
    top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .pc-letter::before,
  .page-contact .pc-letter__mark,
  .page-contact .pc-letter__mark::after,
  .page-contact .pc-tier,
  .page-contact .pc-sec__foot a {
    transition: none;
  }
}
<<<END>>>