.page-contact {
  --pc-ink: #0A0F0D;
  --pc-rule: rgba(244, 241, 234, 0.13);
  --pc-card-shade: var(--bs-warm);
}

/* ── 首屏 ───────────────────────────────── */

.page-contact .pc-hero {
  padding-top: clamp(20px, 3vw, 40px);
}

.page-contact .pc-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
}

.page-contact .pc-hero h1 {
  font-size: clamp(30px, 6vw, 62px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  font-weight: 800;
  margin: 14px 0 20px;
  color: var(--bs-rice);
}

.page-contact .pc-hero .bs-lead {
  max-width: 34em;
}

.page-contact .pc-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 34px);
}

.page-contact .pc-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 24px);
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: clamp(20px, 2.5vw, 28px);
  border-top: 1px solid var(--pc-rule);
}

.page-contact .pc-hero__fact dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--bs-muted);
  margin-bottom: 8px;
  line-height: 1.5;
}

.page-contact .pc-hero__fact dd {
  margin: 0;
  font-size: clamp(20px, 3vw, 30px);
  color: var(--bs-fluoro);
  line-height: 1.1;
}

.page-contact .pc-hero__figure {
  margin: 0;
  position: relative;
}

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

.page-contact .pc-hero__figure::before {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 3px;
  background: linear-gradient(90deg, var(--bs-matrix), var(--bs-electric) 55%, transparent);
  z-index: 1;
}

/* ── 合作方向 ─────────────────────────────── */

.page-contact .pc-directions__list {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--pc-rule);
  border: 1px solid var(--pc-rule);
}

.page-contact .pc-direction {
  background: var(--bs-black);
  padding: clamp(22px, 3vw, 34px);
  display: flex;
  flex-direction: column;
}

.page-contact .pc-direction__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--bs-clay);
  margin-bottom: 14px;
}

.page-contact .pc-direction h3 {
  font-size: clamp(19px, 2.2vw, 23px);
  margin: 0 0 12px;
  color: var(--bs-rice);
  line-height: 1.3;
}

.page-contact .pc-direction p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--bs-muted);
}

.page-contact .pc-direction__plain {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--pc-rule);
  font-family: var(--bs-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--bs-moss);
  line-height: 1.7;
}

.page-contact .pc-directions__foot {
  margin-top: clamp(22px, 3vw, 32px);
  font-size: 14px;
  line-height: 1.8;
}

.page-contact .pc-directions__foot a,
.page-contact .pc-channel__foot a,
.page-contact .pc-scope__copy > p a {
  color: var(--bs-electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 140, 255, 0.4);
}

.page-contact .pc-directions__foot a:hover,
.page-contact .pc-channel__foot a:hover,
.page-contact .pc-scope__copy > p a:hover {
  color: var(--bs-matrix);
  border-bottom-color: var(--bs-matrix);
}

/* ── 联系渠道 ─────────────────────────────── */

.page-contact .pc-channel {
  background: var(--bs-midnight);
  border-top: 1px solid var(--pc-rule);
  border-bottom: 1px solid var(--pc-rule);
}

.page-contact .pc-channel__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 44px);
  align-items: start;
}

.page-contact .pc-channel__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-contact .pc-channel-card {
  background: var(--pc-card-shade);
  color: var(--pc-ink);
  padding: clamp(20px, 2.6vw, 30px);
  border-radius: 0;
  position: relative;
}

.page-contact .pc-channel-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--bs-clay);
}

.page-contact .pc-channel-card__label {
  margin: 0 0 10px;
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(10, 15, 13, 0.6);
}

.page-contact .pc-channel-card__value {
  margin: 0 0 12px;
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  color: var(--pc-ink);
  line-height: 1.4;
  word-break: break-word;
}

.page-contact .pc-channel-card__value--text {
  font-family: var(--bs-body);
  font-weight: 600;
  font-size: clamp(15px, 1.7vw, 18px);
  letter-spacing: 0;
}

.page-contact .pc-channel-card__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(10, 15, 13, 0.72);
}

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

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

.page-contact .pc-channel__foot {
  margin-top: clamp(22px, 3vw, 32px);
  font-size: 14px;
  line-height: 1.8;
}

/* ── 邮件主题指引 ─────────────────────────── */

.page-contact .pc-subject__table {
  margin-top: clamp(26px, 3.5vw, 40px);
  border: 1px solid var(--pc-rule);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--pc-rule);
}

.page-contact .pc-subject__row {
  background: var(--bs-black);
  padding: clamp(16px, 2.2vw, 22px) clamp(18px, 2.6vw, 28px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-contact .pc-subject__code {
  margin: 0;
  font-family: var(--bs-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--bs-fluoro);
  word-break: break-word;
}

.page-contact .pc-subject__note {
  margin-top: clamp(20px, 2.6vw, 28px);
  font-size: 14px;
  line-height: 1.8;
}

/* ── 合作流程 ─────────────────────────────── */

.page-contact .pc-flow__steps {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-left: 1px solid var(--pc-rule);
}

.page-contact .pc-flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 28px);
  padding: 0 0 clamp(26px, 3.5vw, 40px) clamp(18px, 3vw, 34px);
  position: relative;
}

.page-contact .pc-flow__step:last-child {
  padding-bottom: 0;
}

.page-contact .pc-flow__step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--bs-matrix);
  border-radius: 50%;
}

.page-contact .pc-flow__no {
  font-size: clamp(26px, 3.4vw, 40px);
  color: var(--bs-clay);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-contact .pc-flow__body h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--bs-rice);
  line-height: 1.3;
}

.page-contact .pc-flow__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bs-muted);
  max-width: 60ch;
}

/* ── 服务范围与响应 ───────────────────────── */

.page-contact .pc-scope__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-contact .pc-scope__copy h2 {
  margin-bottom: 20px;
}

.page-contact .pc-scope__copy > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--bs-muted);
  margin: 0 0 18px;
  max-width: 58ch;
}

.page-contact .pc-scope__list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0;
  padding: 0;
  border-top: 1px solid var(--pc-rule);
}

.page-contact .pc-scope__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--pc-rule);
}

.page-contact .pc-scope__k {
  font-family: var(--bs-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bs-matrix);
}

.page-contact .pc-scope__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--bs-rice);
}

.page-contact .pc-scope__panel {
  border-left: 3px solid var(--bs-electric);
}

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

.page-contact .pc-scope__panel-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--pc-rule);
}

.page-contact .pc-scope__panel-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-contact .pc-scope__panel-list a {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--bs-rice);
  text-decoration: none;
  margin-bottom: 4px;
  border-bottom: 0;
}

.page-contact .pc-scope__panel-list a:hover {
  color: var(--bs-matrix);
}

.page-contact .pc-scope__panel-list span {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bs-dim);
}

/* ── 常见对接问题 ─────────────────────────── */

.page-contact .pc-faq__list {
  margin-top: clamp(26px, 3.5vw, 42px);
  border-top: 1px solid var(--pc-rule);
}

.page-contact .pc-faq__item {
  border-bottom: 1px solid var(--pc-rule);
}

.page-contact .pc-faq__item summary {
  cursor: pointer;
  list-style: none;
  padding: clamp(16px, 2.2vw, 22px) clamp(30px, 4vw, 44px) clamp(16px, 2.2vw, 22px) 0;
  font-size: clamp(15px, 1.9vw, 18px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--bs-rice);
  position: relative;
}

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

.page-contact .pc-faq__item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--bs-mono);
  font-size: 20px;
  color: var(--bs-matrix);
  line-height: 1;
}

.page-contact .pc-faq__item[open] summary::after {
  content: "−";
  color: var(--bs-fluoro);
}

.page-contact .pc-faq__item summary:hover {
  color: var(--bs-matrix);
}

.page-contact .pc-faq__item p {
  margin: 0 0 clamp(18px, 2.4vw, 24px);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--bs-muted);
  max-width: 68ch;
}

/* ── 响应式 ───────────────────────────────── */

@media (min-width: 680px) {
  .page-contact .pc-subject__row {
    flex-wrap: nowrap;
  }

  .page-contact .pc-scope__list li {
    grid-template-columns: 12em minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-contact .pc-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

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

  .page-contact .pc-channel__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-contact .pc-scope__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.75fr);
  }

  .page-contact .pc-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(24px, 4vw, 56px);
    border-left: 0;
    border-top: 1px solid var(--pc-rule);
    padding-top: clamp(24px, 3vw, 34px);
  }

  .page-contact .pc-flow__step {
    padding: 0 0 clamp(26px, 3vw, 38px) 0;
  }

  .page-contact .pc-flow__step::before {
    display: none;
  }
}

@media (min-width: 1180px) {
  .page-contact .pc-hero__facts {
    gap: 32px;
  }

  .page-contact .pc-channel__cards {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .pc-channel-card::after,
  .page-contact .pc-hero__figure::before {
    transition: none;
  }
}