.page-contact {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-sans);
}

.page-contact img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(36px, 6vw, 72px);
  border-bottom: var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, var(--signal-12), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, var(--amber-18), transparent 62%);
  overflow: hidden;
}

.page-contact .breadcrumb {
  margin-bottom: clamp(20px, 3.5vw, 36px);
}

.page-contact .contact-hero__head {
  display: grid;
  gap: clamp(22px, 3.5vw, 44px);
  align-items: end;
}

.page-contact .eyebrow {
  font-family: var(--font-mono);
  letter-spacing: .14em;
  color: var(--signal);
}

.page-contact .contact-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-condensed);
  font-weight: 800;
  font-size: clamp(34px, 7.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-contact .contact-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--white);
}

.page-contact .contact-hero__note {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .contact-hero__visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--panel);
}

.page-contact .contact-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--signal), transparent 70%);
  z-index: 1;
}

.page-contact .contact-hero__visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.85) contrast(1.08);
}

/* ---------- 三条通道 ---------- */
.page-contact .channels {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .channel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
  border: 1px solid var(--grid);
  border-top: 2px solid var(--signal-35);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-contact .channel:hover {
  border-color: var(--signal);
  transform: translateY(-2px);
}

.page-contact .channel__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-contact .channel__title {
  margin: 0;
  font-family: var(--font-condensed);
  font-size: 20px;
  letter-spacing: .05em;
  color: var(--white);
}

.page-contact .channel__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 700;
  color: var(--signal);
  word-break: break-all;
}

.page-contact .channel__for {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .channel__tip {
  margin: auto 0 0;
  padding-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .channel__link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px dashed var(--amber-40);
}

.page-contact .channel__link:hover {
  color: var(--amber-soft);
}

/* ---------- 章节通用 ---------- */
.page-contact .contact-block {
  padding: clamp(48px, 7vw, 88px) 0;
  border-bottom: var(--line);
}

.page-contact .contact-block--last {
  border-bottom: 0;
}

.page-contact .block-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 16px;
  align-items: start;
  margin-bottom: clamp(24px, 3.5vw, 44px);
}

.page-contact .block-head__no {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 60px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal-35);
}

.page-contact .block-head__title {
  margin: 0;
  font-family: var(--font-condensed);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-contact .block-head__lede {
  grid-column: 2;
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 合作方向 ---------- */
.page-contact .partner-split {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-contact .partner-split__visual {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--panel);
}

.page-contact .partner-split__visual img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.8) contrast(1.05);
}

.page-contact .media__caption {
  padding: 12px 14px;
  border-top: var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-contact .partner-list {
  display: grid;
  gap: 10px;
}

.page-contact .partner {
  background: var(--panel);
  border: 1px solid var(--grid);
  transition: border-color .22s var(--ease);
}

.page-contact .partner[open] {
  border-color: var(--signal-35);
  background:
    linear-gradient(180deg, var(--signal-06), transparent 70%),
    var(--panel);
}

.page-contact .partner__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-condensed);
  font-size: 18px;
  letter-spacing: .03em;
  color: var(--white);
}

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

.page-contact .partner__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--signal);
}

.page-contact .partner[open] .partner__sum::after {
  content: "–";
}

.page-contact .partner__no {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--amber-40);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
}

.page-contact .partner__body {
  padding: 0 18px 18px;
}

.page-contact .partner__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 数据问题反馈 ---------- */
.page-contact .feedback {
  display: grid;
  gap: 18px;
}

.page-contact .feedback__panel {
  padding: clamp(18px, 2.8vw, 28px);
  border: 1px solid var(--amber-40);
  background:
    linear-gradient(180deg, var(--amber-18), transparent 62%),
    var(--panel);
}

.page-contact .feedback__panel h3 {
  margin: 0 0 16px;
  font-family: var(--font-condensed);
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--amber-soft);
}

.page-contact .feedback__types {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .feedback__type {
  padding-top: 14px;
  border-top: 1px dashed var(--grid);
}

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

.page-contact .feedback__name {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .03em;
  color: var(--white);
}

.page-contact .feedback__need {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .feedback__kit {
  padding: clamp(18px, 2.8vw, 28px);
  border: 1px solid var(--grid);
  background: var(--ink-veil);
}

.page-contact .feedback__kit h3 {
  margin: 0 0 14px;
  font-family: var(--font-condensed);
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--signal);
}

.page-contact .kit-template {
  margin: 0;
  padding: 16px;
  border-left: 2px solid var(--signal);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 2.1;
  color: var(--mist);
}

.page-contact .feedback__hint {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 接口与批量账号 ---------- */
.page-contact .iface {
  border: 1px solid var(--grid);
  background: var(--panel);
}

.page-contact .iface .axis {
  padding: 12px;
  border-bottom: var(--line);
  flex-wrap: wrap;
  gap: 8px;
}

.page-contact .iface__panel {
  padding: clamp(18px, 2.8vw, 30px);
}

.page-contact .iface__panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-condensed);
  font-size: 21px;
  letter-spacing: .04em;
  color: var(--signal);
}

.page-contact .iface__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--muted);
}

.page-contact .iface__note {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 通信与邮寄 ---------- */
.page-contact .mailbox {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  align-items: stretch;
}

.page-contact .mailbox__map {
  position: relative;
  min-height: 220px;
  border: 1px solid var(--grid);
  background:
    repeating-linear-gradient(0deg, transparent 0 29px, var(--grid) 29px 30px),
    repeating-linear-gradient(90deg, transparent 0 29px, var(--grid) 29px 30px),
    radial-gradient(80% 80% at 70% 20%, var(--signal-06), transparent 70%),
    var(--panel);
  overflow: hidden;
}

.page-contact .mailbox__map::after {
  content: "";
  position: absolute;
  left: 40%;
  top: 46%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 6px var(--signal-18), 0 0 0 14px var(--signal-06);
}

.page-contact .mailbox__flag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 1;
}

.page-contact .mailbox__list {
  margin: 0;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--grid);
  background: var(--panel);
}

.page-contact .mailbox__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--grid);
}

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

.page-contact .mailbox__row:first-child {
  padding-top: 0;
}

.page-contact .mailbox__row dt {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.8;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-contact .mailbox__row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--white);
  word-break: break-word;
}

/* ---------- 时效与流程 ---------- */
.page-contact .timeline__desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-contact .contact-next {
  padding: clamp(36px, 6vw, 76px) 0 clamp(48px, 8vw, 96px);
  background:
    linear-gradient(180deg, transparent, var(--signal-06)),
    var(--ink);
  border-top: var(--line);
}

.page-contact .contact-next__inner {
  display: grid;
  gap: 20px;
}

.page-contact .contact-next h2 {
  margin: 0;
  font-family: var(--font-condensed);
  font-weight: 800;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-contact .contact-next p {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .contact-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .contact-next__fine {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .contact-next__fine a {
  color: var(--mist);
}

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

@media (min-width: 760px) {
  .page-contact .channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero__head {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }

  .page-contact .feedback {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-contact .mailbox {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  }
}

@media (min-width: 980px) {
  .page-contact .partner-split {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  }

  .page-contact .contact-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-contact .contact-next__fine {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel,
  .page-contact .partner {
    transition: none;
  }

  .page-contact .channel:hover {
    transform: none;
  }
}