.page-contact {
  --pcn-line: rgba(11, 31, 51, 0.14);
  --pcn-line-light: rgba(233, 241, 245, 0.16);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-contact .pcn-hero {
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(130% 100% at 88% -20%, rgba(35, 213, 230, 0.18), transparent 62%),
    radial-gradient(90% 80% at -10% 110%, rgba(255, 138, 61, 0.13), transparent 66%),
    var(--paper);
}

.page-contact .pcn-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-contact .pcn-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.15rem, 6.6vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0.7rem 0 0;
  color: var(--ink);
}

.page-contact .pcn-hero__lede {
  margin-top: 1.05rem;
  max-width: 44ch;
  color: var(--stone);
}

.page-contact .pcn-facts {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 1.05rem 0 0;
  border-top: 1px solid var(--pcn-line);
  display: grid;
  gap: 1rem;
}

.page-contact .pcn-facts li {
  display: grid;
  gap: 0.25rem;
}

.page-contact .pcn-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1;
}

.page-contact .pcn-facts__lab {
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--stone);
}

.page-contact .pcn-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

/* ---------- 右栏联系卡 ---------- */
.page-contact .pcn-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-m);
  background: var(--ink);
  color: var(--text-light);
  padding: clamp(1.35rem, 3.6vw, 2rem);
  box-shadow: 0 20px 44px -30px rgba(11, 31, 51, 0.7);
}

.page-contact .pcn-card__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  pointer-events: none;
}

.page-contact .pcn-card__body {
  position: relative;
}

.page-contact .pcn-card__code {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0;
}

.page-contact .pcn-card__title {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 3vw, 1.55rem);
  font-weight: 700;
  line-height: 1.3;
  margin: 0.55rem 0 0;
  color: var(--text-light);
}

.page-contact .pcn-rows {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-contact .pcn-row {
  display: grid;
  gap: 0.35rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--pcn-line-light);
}

.page-contact .pcn-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-contact .pcn-row__key {
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: rgba(233, 241, 245, 0.52);
}

.page-contact .pcn-row__line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.page-contact .pcn-row__val {
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 2.4vw, 0.96rem);
  line-height: 1.5;
  color: var(--text-light);
  text-decoration: none;
  word-break: break-all;
}

.page-contact .pcn-row__val--plain {
  font-family: var(--font-body);
  word-break: normal;
}

.page-contact a.pcn-row__val:hover,
.page-contact a.pcn-row__val:focus-visible {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .pcn-copy {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  padding: 0.28rem 0.55rem;
  border-radius: var(--r-s);
  border: 1px solid rgba(35, 213, 230, 0.45);
  background: rgba(35, 213, 230, 0.08);
  color: var(--cyan);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-contact .pcn-copy:hover,
.page-contact .pcn-copy:focus-visible {
  background: var(--cyan);
  color: var(--ink);
}

.page-contact .pcn-card__note {
  margin: 1.15rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--pcn-line-light);
  font-size: 0.78rem;
  line-height: 1.75;
  color: rgba(233, 241, 245, 0.66);
}

/* ---------- 页内目录 ---------- */
.page-contact .pcn-toc {
  margin-top: clamp(1.6rem, 4vw, 2.5rem);
  border-top: 1px solid var(--pcn-line);
  border-bottom: 1px solid var(--pcn-line);
  padding: 0.65rem 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-contact .pcn-toc::-webkit-scrollbar {
  display: none;
}

.page-contact .pcn-toc__list {
  display: flex;
  gap: 1.3rem;
  list-style: none;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

.page-contact .pcn-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.8rem;
  color: var(--stone);
  text-decoration: none;
  padding: 0.15rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-contact .pcn-toc__list .mono {
  font-size: 0.66rem;
  color: var(--moss);
}

.page-contact .pcn-toc__list a:hover,
.page-contact .pcn-toc__list a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}

/* ---------- 章节头 ---------- */
.page-contact .pcn-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.4rem);
}

.page-contact .pcn-sec-head__note {
  margin: 0.7rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--stone);
}

.page-contact .pcn-sec-head .sec-title {
  margin: 0.55rem 0 0;
}

/* ---------- 合作类型 ---------- */
.page-contact .pcn-picker {
  display: grid;
  gap: 1.25rem;
}

.page-contact .pcn-picker__labels {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-contact .pcn-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.58rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(11, 31, 51, 0.18);
  background: rgba(244, 240, 230, 0.72);
  color: var(--ink);
  font-size: 0.88rem;
  line-height: 1.2;
  cursor: pointer;
  transition: background 0.22s var(--ease), color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-contact .pcn-chip .mono {
  font-size: 0.66rem;
  color: var(--moss);
  transition: color 0.22s var(--ease);
}

.page-contact .pcn-chip:hover {
  border-color: var(--ink);
}

.page-contact #coop-biz:checked ~ .pcn-picker__labels label[for="coop-biz"],
.page-contact #coop-content:checked ~ .pcn-picker__labels label[for="coop-content"],
.page-contact #coop-download:checked ~ .pcn-picker__labels label[for="coop-download"],
.page-contact #coop-mobile:checked ~ .pcn-picker__labels label[for="coop-mobile"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-contact #coop-biz:checked ~ .pcn-picker__labels label[for="coop-biz"] .mono,
.page-contact #coop-content:checked ~ .pcn-picker__labels label[for="coop-content"] .mono,
.page-contact #coop-download:checked ~ .pcn-picker__labels label[for="coop-download"] .mono,
.page-contact #coop-mobile:checked ~ .pcn-picker__labels label[for="coop-mobile"] .mono {
  color: var(--cyan);
}

.page-contact #coop-biz:focus-visible ~ .pcn-picker__labels label[for="coop-biz"],
.page-contact #coop-content:focus-visible ~ .pcn-picker__labels label[for="coop-content"],
.page-contact #coop-download:focus-visible ~ .pcn-picker__labels label[for="coop-download"],
.page-contact #coop-mobile:focus-visible ~ .pcn-picker__labels label[for="coop-mobile"] {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-contact .pcn-picker__panels {
  position: relative;
}

.page-contact .pcn-panel {
  display: none;
  background: var(--paper);
  border: 1px solid rgba(11, 31, 51, 0.12);
  border-left: 3px solid var(--orange);
  border-radius: var(--r-m);
  padding: clamp(1.15rem, 3vw, 1.8rem);
}

.page-contact #coop-biz:checked ~ .pcn-picker__panels .pcn-panel--biz,
.page-contact #coop-content:checked ~ .pcn-picker__panels .pcn-panel--content,
.page-contact #coop-download:checked ~ .pcn-picker__panels .pcn-panel--download,
.page-contact #coop-mobile:checked ~ .pcn-picker__panels .pcn-panel--mobile {
  display: block;
}

.page-contact .pcn-panel__title {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
  color: var(--ink);
}

.page-contact .pcn-panel__body {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--stone);
  max-width: 62ch;
}

.page-contact .pcn-panel__list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.page-contact .pcn-panel__list li {
  position: relative;
  padding-left: 1.05rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .pcn-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--orange);
}

/* ---------- 合作流程 ---------- */
.page-contact .pcn-process__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
}

.page-contact .pcn-process__figure {
  margin: 0;
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--ink);
}

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

.page-contact .pcn-process__figure figcaption {
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--stone);
  padding: 0.75rem 0 0;
  background: var(--paper);
}

.page-contact .pcn-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .pcn-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 0;
  border-top: 1px solid var(--pcn-line);
}

.page-contact .pcn-step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-contact .pcn-step__no {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--orange-ink);
  padding-top: 0.18rem;
}

.page-contact .pcn-step__title {
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  color: var(--ink);
}

.page-contact .pcn-step__body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 写信提示（深底） ---------- */
.page-contact .pcn-writing {
  color: var(--text-light);
}

.page-contact .pcn-writing__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-contact .pcn-writing .sec-code {
  color: var(--cyan);
}

.page-contact .pcn-writing__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.7rem, 4.2vw, 2.7rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 0;
  color: var(--text-light);
}

.page-contact .pcn-writing__lede {
  margin: 0.9rem 0 0;
  max-width: 40ch;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(233, 241, 245, 0.72);
}

.page-contact .pcn-writing__cta {
  margin-top: 1.4rem;
}

.page-contact .pcn-checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-contact .pcn-check {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--pcn-line-light);
}

.page-contact .pcn-check:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-contact .pcn-check__no {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 0.2rem;
}

.page-contact .pcn-check__title {
  font-family: var(--font-heading);
  font-size: 0.98rem;
  font-weight: 700;
  margin: 0 0 0.28rem;
  color: var(--text-light);
}

.page-contact .pcn-check p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(233, 241, 245, 0.66);
}

/* ---------- 响应说明 ---------- */
.page-contact .pcn-resp {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-contact .pcn-resp__item {
  display: grid;
  gap: 0.4rem;
  padding: 1.05rem 0 0;
  border-top: 1px solid var(--pcn-line);
}

.page-contact .pcn-resp__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .pcn-resp__key {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--moss);
}

.page-contact .pcn-resp__title {
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 700;
  margin: 0;
  color: var(--ink);
}

.page-contact .pcn-resp__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--stone);
  max-width: 56ch;
}

/* ---------- 来信之前 ---------- */
.page-contact .pcn-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-contact .pcn-next__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas:
    "idx label arrow"
    "idx desc  arrow";
  column-gap: 0.85rem;
  row-gap: 0.2rem;
  align-items: center;
  padding: 0.95rem 0;
  border-top: 1px solid rgba(11, 31, 51, 0.16);
  text-decoration: none;
  color: var(--ink);
  transition: color 0.2s var(--ease), padding-left 0.24s var(--ease);
}

.page-contact .pcn-next__list li:last-child .pcn-next__link {
  border-bottom: 1px solid rgba(11, 31, 51, 0.16);
}

.page-contact .pcn-next__idx {
  grid-area: idx;
  font-size: 0.7rem;
  color: var(--moss);
}

.page-contact .pcn-next__label {
  grid-area: label;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
}

.page-contact .pcn-next__desc {
  grid-area: desc;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--stone);
}

.page-contact .pcn-next__arrow {
  grid-area: arrow;
  font-size: 1rem;
  color: var(--orange-ink);
  transition: transform 0.24s var(--ease);
}

.page-contact .pcn-next__link:hover,
.page-contact .pcn-next__link:focus-visible {
  color: var(--cyan-ink);
  padding-left: 0.35rem;
}

.page-contact .pcn-next__link:hover .pcn-next__arrow,
.page-contact .pcn-next__link:focus-visible .pcn-next__arrow {
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .pcn-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .page-contact .pcn-resp {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem 1.8rem;
  }

  .page-contact .pcn-resp__item:nth-child(2) {
    padding-top: 0;
    border-top: 0;
  }
}

@media (min-width: 900px) {
  .page-contact .pcn-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-contact .pcn-card {
    position: sticky;
    top: 6.5rem;
  }

  .page-contact .pcn-writing__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-contact .pcn-process__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }
}

@media (min-width: 1024px) {
  .page-contact .pcn-picker__labels {
    gap: 0.6rem;
  }

  .page-contact .pcn-next__link {
    grid-template-columns: auto minmax(0, 0.32fr) minmax(0, 1fr) auto;
    grid-template-areas: "idx label desc arrow";
    column-gap: 1.4rem;
    align-items: baseline;
  }
}
<<<END>>>