.page-contact .c-block {
  padding: clamp(46px, 8vw, 92px) 0;
}

.page-contact .c-head {
  max-width: 720px;
}

.page-contact .c-head__title {
  margin-top: 10px;
}

.page-contact .c-head__lede {
  margin-top: 14px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.78;
}

/* ---------- 首屏 ---------- */
.page-contact .c-hero {
  padding: 18px 0 6px;
}

.page-contact .c-hero__grid {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-contact .c-hero__title {
  margin-top: 12px;
  font-size: clamp(1.85rem, 7.4vw, 3.35rem);
  line-height: 1.08;
  letter-spacing: -0.012em;
}

.page-contact .c-hero__lede {
  margin-top: 16px;
  color: var(--muted);
  max-width: 40ch;
}

.page-contact .c-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-contact .c-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  background: linear-gradient(160deg, rgba(14, 46, 69, 0.9), rgba(7, 28, 44, 0.98));
  box-shadow: var(--sh-soft), var(--sh-inset);
}

.page-contact .c-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(200deg, rgba(47, 230, 214, 0.18), transparent 46%),
    linear-gradient(20deg, rgba(154, 92, 255, 0.16), transparent 52%);
  pointer-events: none;
}

.page-contact .c-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-contact .c-index {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-contact .c-index li {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-contact .c-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  color: var(--cream);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-contact .c-index a:hover,
.page-contact .c-index a:focus-visible {
  color: var(--cyan);
  background: rgba(47, 230, 214, 0.06);
}

.page-contact .c-index .ly-num {
  color: var(--cyan);
  font-size: 0.76rem;
}

/* ---------- 合作方向技能树 ---------- */
.page-contact .c-tree {
  position: relative;
  margin-top: 40px;
  display: grid;
  gap: 20px;
}

.page-contact .c-tree::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--line-cyan), rgba(47, 230, 214, 0.06));
}

.page-contact .c-branch {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-contact .c-branch__node {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 18px;
}

.page-contact .c-branch__node::after {
  content: "";
  position: absolute;
  top: 37px;
  left: 50%;
  width: calc(100% + 14px);
  height: 1px;
  background: var(--line-cyan);
}

.page-contact .c-branch__dot {
  position: relative;
  z-index: 2;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--abyss);
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 230, 214, 0.1);
}

.page-contact .c-card {
  position: relative;
  z-index: 1;
  background: linear-gradient(158deg, var(--ink), rgba(7, 28, 44, 0.72));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-soft), var(--sh-inset);
  overflow: hidden;
  transition: border-color 0.24s var(--ease);
}

.page-contact .c-card[open] {
  border-color: var(--line-cyan);
}

.page-contact .c-card summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 8px;
  padding: 18px 52px 18px 20px;
}

.page-contact .c-card summary::-webkit-details-marker {
  display: none;
}

.page-contact .c-card summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-contact .c-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-contact .c-card__title {
  margin: 0;
}

.page-contact .c-card__brief {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

.page-contact .c-card__more {
  position: absolute;
  right: 20px;
  top: 26px;
  width: 13px;
  height: 13px;
}

.page-contact .c-card__more::before,
.page-contact .c-card__more::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-contact .c-card__more::before {
  left: 0;
  top: 5px;
  width: 13px;
  height: 2px;
}

.page-contact .c-card__more::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 13px;
  transition: transform 0.2s var(--ease);
}

.page-contact .c-card[open] .c-card__more::after {
  transform: scaleY(0);
}

.page-contact .c-facts {
  margin: 0;
  padding: 2px 20px 20px;
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
}

.page-contact .c-facts dt {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  padding-top: 14px;
}

.page-contact .c-facts dd {
  margin: 0;
  color: var(--cream);
  font-size: 0.94rem;
  line-height: 1.74;
}

.page-contact .c-inline-link {
  margin-top: 26px;
  color: var(--muted);
  font-size: 0.94rem;
}

.page-contact .c-network {
  margin: 38px 0 0;
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(140deg, rgba(14, 46, 69, 0.8), rgba(7, 28, 44, 0.95));
}

.page-contact .c-network img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-contact .c-network__caption {
  padding: 14px 18px 16px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.7;
  border-top: 1px solid var(--line);
}

/* ---------- 奶油纸联系区 ---------- */
.page-contact .c-cream {
  background: var(--cream);
  color: var(--charcoal);
  border-radius: var(--r-xl);
  padding: clamp(26px, 4.6vw, 50px);
  box-shadow: var(--sh-soft);
}

.page-contact .c-cream__kicker {
  color: #96602a;
}

.page-contact .c-cream__kicker::before {
  background: #96602a;
}

.page-contact .c-cream__title {
  color: var(--charcoal);
  margin-top: 10px;
}

.page-contact .c-cream__lede {
  margin-top: 14px;
  max-width: 66ch;
  color: #4a3f38;
  font-size: 1rem;
  line-height: 1.78;
}

.page-contact .c-chan {
  margin-top: 30px;
  display: grid;
  gap: 14px;
}

.page-contact .c-chan__item {
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(27, 21, 18, 0.14);
  border-radius: var(--r-md);
  padding: 18px 18px 20px;
}

.page-contact .c-chan__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: #7a6a54;
}

.page-contact .c-chan__val {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--charcoal);
  text-decoration: none;
  word-break: break-word;
  border-bottom: 1px solid rgba(27, 21, 18, 0.28);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-contact .c-chan__val:hover,
.page-contact .c-chan__val:focus-visible {
  color: #a83a1c;
  border-color: #a83a1c;
}

.page-contact .c-chan__val--plain {
  border-bottom: 0;
  cursor: default;
}

.page-contact .c-chan__note {
  margin: 12px 0 0;
  color: #4a3f38;
  font-size: 0.9rem;
  line-height: 1.72;
}

.page-contact .c-cream__foot {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(27, 21, 18, 0.16);
  color: #4a3f38;
  font-size: 0.9rem;
  line-height: 1.72;
}

/* ---------- 沟通建议 ---------- */
.page-contact .c-steps {
  margin-top: 34px;
  display: grid;
  gap: 22px;
}

.page-contact .c-step {
  border-top: 2px solid var(--line-cyan);
  padding-top: 16px;
}

.page-contact .c-step__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-contact .c-step__title {
  margin: 12px 0 0;
}

.page-contact .c-step__text {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.74;
}

/* ---------- 数据疑问 ---------- */
.page-contact .c-feedback {
  display: grid;
  gap: 26px;
}

.page-contact .c-feedback__para {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.78;
}

.page-contact .c-feedback__list {
  background: linear-gradient(160deg, rgba(14, 46, 69, 0.86), rgba(7, 28, 44, 0.9));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 20px;
  box-shadow: var(--sh-soft), var(--sh-inset);
}

.page-contact .c-feedback__listtitle {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-contact .c-checklist {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-contact .c-checklist li {
  position: relative;
  padding-left: 20px;
  color: var(--cream);
  font-size: 0.93rem;
  line-height: 1.7;
}

.page-contact .c-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--violet);
}

.page-contact .c-feedback__mail {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 地区与备案 ---------- */
.page-contact .c-registry {
  padding: 0 0 clamp(46px, 8vw, 92px);
}

.page-contact .c-registry__panel {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-contact .c-registry__cell {
  background: linear-gradient(150deg, var(--ink), rgba(7, 28, 44, 0.92));
  padding: 18px 20px;
}

.page-contact .c-registry__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-contact .c-registry__value {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--cyan);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .c-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-contact .c-facts {
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: 14px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-contact .c-hero {
    padding: 30px 0 10px;
  }

  .page-contact .c-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 44px;
  }

  .page-contact .c-hero__media {
    clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  }

  .page-contact .c-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-contact .c-tree {
    gap: 26px;
  }

  .page-contact .c-tree::before {
    left: 27px;
  }

  .page-contact .c-branch {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 22px;
  }

  .page-contact .c-branch__node {
    padding-top: 20px;
  }

  .page-contact .c-branch__node::after {
    top: 41px;
    width: calc(100% + 22px);
  }

  .page-contact .c-branch__dot {
    width: 44px;
    height: 44px;
    font-size: 0.84rem;
  }

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

  .page-contact .c-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
    row-gap: 34px;
  }

  .page-contact .c-step:nth-child(even) {
    margin-top: 26px;
  }

  .page-contact .c-feedback {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 46px;
    align-items: start;
  }

  .page-contact .c-registry__panel {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .c-index a,
  .page-contact .c-card,
  .page-contact .c-card__more::after,
  .page-contact .c-chan__val {
    transition: none;
  }
}