/* ===================== page-contact ===================== */
.page-contact {
  --pc-cut: 20px;
  --pc-gold-line: rgba(201, 162, 39, .42);
  --pc-panel-bg: linear-gradient(152deg, rgba(201, 162, 39, .13), rgba(20, 38, 60, .92) 44%, rgba(11, 26, 46, .97));
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏框景 ---------- */
.page-contact__banner {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--black);
  border-bottom: 1px solid var(--line-strong);
  padding: clamp(26px, 5.2vw, 56px) 0 clamp(30px, 5vw, 54px);
}

.page-contact__banner img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 64% 38%;
  opacity: .3;
  filter: grayscale(.45) contrast(1.1);
}

.page-contact__banner::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, var(--hair) 0 1px, transparent 1px 88px),
    linear-gradient(96deg, var(--ink) 3%, rgba(11, 26, 46, .9) 44%, rgba(5, 9, 15, .58) 100%);
}

.page-contact__banner-inner {
  position: relative;
  z-index: 1;
}

.page-contact__crumbs {
  margin: 0 0 clamp(14px, 2vw, 24px);
}

.page-contact__banner h1 {
  margin: clamp(8px, 1.4vw, 14px) 0 0;
  max-width: 22ch;
  font-size: clamp(30px, 6.4vw, 54px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-contact__lede {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 主体轨道 ---------- */
.page-contact__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(32px, 4.6vw, 60px) clamp(48px, 7vw, 96px);
}

@media (min-width: 980px) {
  .page-contact__body {
    grid-template-columns: minmax(186px, 236px) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 58px);
  }
}

.page-contact__rail {
  align-self: start;
}

@media (min-width: 980px) {
  .page-contact__rail {
    position: sticky;
    top: 96px;
  }
}

.page-contact__rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-contact__index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-contact__index li {
  border-bottom: 1px solid var(--hair);
}

.page-contact__index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 2px;
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  color: var(--steel);
  transition: color .18s var(--ease);
}

.page-contact__index a span {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  color: var(--gold);
}

.page-contact__index a:hover,
.page-contact__index a:focus-visible {
  color: var(--gold-hi);
}

.page-contact__rail-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--steel);
  padding-left: 10px;
  border-left: 2px solid var(--pc-gold-line);
}

/* ---------- 章节 ---------- */
.page-contact__section {
  border-top: 1px solid var(--line-strong);
  padding-top: clamp(22px, 3vw, 34px);
  scroll-margin-top: 100px;
}

.page-contact__section + .page-contact__section {
  margin-top: clamp(34px, 5vw, 62px);
}

.page-contact__head {
  display: grid;
  gap: 8px 18px;
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

@media (min-width: 720px) {
  .page-contact__head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
  }
}

.page-contact__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--gold);
  transition: color .25s var(--ease), text-shadow .25s var(--ease);
}

.page-contact__section.is-current .page-contact__num {
  color: var(--gold-hi);
  text-shadow: 0 0 22px rgba(240, 201, 74, .32);
}

.page-contact__section h2 {
  margin: 0;
  font-size: clamp(21px, 2.7vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--paper);
}

.page-contact__sub {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 01 三类合作方向 ---------- */
.pc-tracks {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.pc-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--hair);
}

.pc-track:first-child {
  border-top: 1px solid var(--hair);
}

@media (min-width: 720px) {
  .pc-track {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 6px 22px;
  }
}

.pc-track__i {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--gold);
  padding-top: 5px;
}

.pc-track__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 800;
  color: var(--paper);
}

.pc-track__desc {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel);
}

.pc-track__meta {
  margin: 0;
  display: grid;
  gap: 10px;
}

@media (min-width: 720px) {
  .pc-track__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 26px;
  }
}

.pc-track__meta > div {
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
}

.pc-track__meta dt {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--green);
  margin-bottom: 5px;
}

.pc-track__meta > div:last-child dt {
  color: var(--orange);
}

.pc-track__meta dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 02 官方联系渠道（金框切角面板） ---------- */
.pc-panel {
  position: relative;
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--pc-gold-line);
  background: var(--pc-panel-bg);
  clip-path: polygon(0 0, calc(100% - var(--pc-cut)) 0, 100% var(--pc-cut), 100% 100%, var(--pc-cut) 100%, 0 calc(100% - var(--pc-cut)));
}

.pc-panel__tag {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--gold-hi);
}

.pc-channels {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
}

@media (min-width: 860px) {
  .pc-channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 2.6vw, 34px);
  }
}

.pc-channel {
  padding-top: 14px;
  border-top: 1px solid var(--pc-gold-line);
}

.pc-channel__k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--steel);
}

.pc-channel__v {
  margin: 0 0 10px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
  word-break: break-word;
}

.pc-mono {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

.pc-channel__n {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 03 四步流程 ---------- */
.pc-flow-grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

@media (min-width: 1024px) {
  .pc-flow-grid {
    grid-template-columns: minmax(0, 1fr) minmax(160px, 230px);
  }
}

.pc-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

@media (min-width: 760px) {
  .pc-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px clamp(16px, 2.2vw, 28px);
  }
}

@media (min-width: 1180px) {
  .pc-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.pc-flow__step {
  position: relative;
  padding-top: 26px;
}

.pc-flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line-strong);
}

.pc-flow__step::after {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.pc-flow__step:hover::after {
  background: var(--gold-hi);
  box-shadow: 0 0 0 4px rgba(240, 201, 74, .16);
}

.pc-flow__step:hover .pc-flow__n {
  color: var(--gold-hi);
}

.pc-flow__n {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  line-height: 1;
  color: var(--gold);
  transition: color .2s var(--ease);
}

.pc-flow__t {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.pc-flow__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel);
}

.pc-flow-fig {
  margin: 0;
}

/* ---------- 04 名录收录与更正 ---------- */
.pc-split {
  display: grid;
  gap: clamp(24px, 3.2vw, 42px);
}

@media (min-width: 860px) {
  .pc-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(26px, 3.4vw, 52px);
  }
}

.pc-split__t {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
  font-size: 16px;
  font-weight: 800;
  color: var(--gold);
}

.pc-fields {
  margin: 0;
  display: grid;
  gap: 0;
}

.pc-fields > div {
  display: grid;
  gap: 4px;
  padding: 11px 0;
  border-bottom: 1px solid var(--hair);
}

@media (min-width: 560px) {
  .pc-fields > div {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 6px 16px;
    align-items: baseline;
  }
}

.pc-fields dt {
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.pc-fields dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

.pc-steps {
  margin: 0;
  padding: 0 0 0 4px;
  list-style: none;
  counter-reset: pc-step;
}

.pc-steps li {
  position: relative;
  padding: 0 0 14px 30px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel);
  border-left: 1px solid var(--line);
}

.pc-steps li::before {
  counter-increment: pc-step;
  content: counter(pc-step, decimal-leading-zero);
  position: absolute;
  left: -1px;
  top: 1px;
  transform: translateX(-50%);
  padding: 2px 0;
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  color: var(--gold);
}

.pc-steps li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.pc-split__note {
  margin: 16px 0 0;
  padding: 10px 12px;
  border: 1px solid rgba(232, 112, 58, .34);
  background: rgba(232, 112, 58, .07);
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 05 常见问题 ---------- */
.pc-qa {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.pc-qa__item {
  border-bottom: 1px solid var(--hair);
}

.pc-qa__item summary {
  position: relative;
  padding: 15px 34px 15px 0;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color .18s var(--ease);
}

.pc-qa__item summary::-webkit-details-marker {
  display: none;
}

.pc-qa__item summary::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -6px;
  border-right: 1.5px solid var(--gold);
  border-bottom: 1.5px solid var(--gold);
  transform: rotate(45deg);
  transition: transform .2s var(--ease);
}

.pc-qa__item[open] summary::after {
  transform: rotate(-135deg);
  margin-top: -3px;
}

.pc-qa__item summary:hover,
.pc-qa__item summary:focus-visible {
  color: var(--gold-hi);
}

.pc-qa__item p {
  margin: 0 0 18px;
  max-width: 72ch;
  padding-left: 14px;
  border-left: 2px solid var(--pc-gold-line);
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 页尾相关链接 ---------- */
.pc-tail {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--steel);
}

.pc-tail a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--pc-gold-line);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.pc-tail a:hover,
.pc-tail a:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}

/* ---------- 焦点可见性 ---------- */
.page-contact a:focus-visible,
.page-contact summary:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 3px;
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-contact__num,
  .pc-flow__n,
  .pc-flow__step::after,
  .pc-qa__item summary::after,
  .page-contact__index a,
  .pc-tail a {
    transition: none;
  }
}
</final>