.page-contact {
  --pc-gap: 20px;
  --pc-radius: 2px;
  display: block;
}

.page-contact .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cool-400);
}

.page-contact .crumbs a {
  color: var(--cool-300);
  text-decoration: none;
  transition: color .18s ease;
}

.page-contact .crumbs a:hover {
  color: var(--lime);
}

.page-contact .crumbs [aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏联络牌 ---------- */
.page-contact .contact-board {
  display: grid;
  gap: 36px;
  padding: 10px 0 56px;
  position: relative;
}

.page-contact .contact-board__left {
  display: grid;
  gap: 18px;
  align-content: start;
  min-width: 0;
}

.page-contact h1 {
  font-family: var(--font-display);
  font-size: clamp(29px, 5.4vw, 56px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -.005em;
  margin: 0;
  color: var(--white);
  overflow-wrap: break-word;
}

.page-contact .lede {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cool-300);
}

.page-contact .channels {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.page-contact .channel {
  position: relative;
  padding: 16px 18px 16px 22px;
  background: linear-gradient(158deg, rgba(31, 42, 54, .76), rgba(10, 20, 33, .9));
  border: 1px solid var(--line-strong);
  border-radius: var(--pc-radius);
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}

.page-contact .channel::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 3px;
  height: 24px;
  background: var(--lime);
  transition: background .2s ease;
}

.page-contact .channel:hover {
  border-color: var(--orange);
  transform: translateX(3px);
}

.page-contact .channel:hover::before {
  background: var(--orange);
}

.page-contact .channel__label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cool-400);
}

.page-contact .channel__dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.page-contact .channel__dot--lime {
  background: var(--lime);
}

.page-contact .channel__dot--orange {
  background: var(--orange);
}

.page-contact .channel__dot--cyan {
  background: var(--cyan);
}

.page-contact .channel__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.4vw, 20px);
  font-weight: 600;
  color: var(--white);
  text-decoration: none;
  overflow-wrap: break-word;
  word-break: break-word;
  transition: color .18s ease;
}

.page-contact a.channel__value:hover,
.page-contact a.channel__value:focus-visible {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-contact .channel__value--plain {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--white);
}

.page-contact .channel__note {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cool-400);
}

/* 右侧面板 */
.page-contact .contact-board__right {
  display: grid;
  gap: 14px;
  align-content: start;
  min-width: 0;
}

.page-contact .contact-visual {
  margin: 0;
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

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

.page-contact .contact-visual::after {
  content: "";
  position: absolute;
  right: 16px;
  bottom: 16px;
  width: 64px;
  height: 64px;
  border: 2px solid var(--lime);
  border-radius: 50%;
  opacity: .45;
  pointer-events: none;
}

.page-contact .support-card {
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--lime);
  background: rgba(18, 24, 32, .72);
  padding: 18px 20px 20px;
}

.page-contact .support-card__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--white);
}

.page-contact .support-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-contact .support-list li {
  position: relative;
  padding-left: 17px;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--cool-300);
}

.page-contact .support-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-contact .contact-block {
  padding: 46px 0;
  border-top: 1px solid var(--line);
}

.page-contact .contact-block--dark {
  background: var(--ink-850);
}

.page-contact .section-title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -.004em;
  color: var(--white);
  overflow-wrap: break-word;
}

/* ---------- 回复节奏 ---------- */
.page-contact .reply-grid {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-contact .reply-card {
  position: relative;
  display: grid;
  gap: 9px;
  align-content: start;
  padding: 18px 18px 22px;
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

.page-contact .reply-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 22px;
  height: 22px;
  border-right: 1px solid var(--orange);
  border-bottom: 1px solid var(--orange);
  opacity: .6;
}

.page-contact .reply-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  overflow-wrap: break-word;
}

.page-contact .reply-card__num small {
  margin-left: 5px;
  font-size: 12px;
  font-weight: 400;
  color: var(--cool-400);
}

.page-contact .reply-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--cool-300);
}

.page-contact .reply-foot,
.page-contact .prep-foot {
  margin: 22px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--cool-400);
}

.page-contact .reply-foot a,
.page-contact .prep-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 214, 255, .4);
  transition: color .18s ease, border-color .18s ease;
}

.page-contact .reply-foot a:hover,
.page-contact .reply-foot a:focus-visible,
.page-contact .prep-foot a:hover,
.page-contact .prep-foot a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 大屏准备清单 ---------- */
.page-contact .prep-list {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-contact .prep-list details {
  border: 1px solid var(--line-strong);
  background: rgba(18, 24, 32, .72);
  transition: border-color .2s ease;
}

.page-contact .prep-list details[open] {
  border-color: rgba(184, 255, 61, .5);
}

.page-contact .prep-list summary {
  position: relative;
  padding: 15px 46px 15px 18px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--white);
  cursor: pointer;
  list-style: none;
}

.page-contact .prep-list summary::-webkit-details-marker {
  display: none;
}

.page-contact .prep-list summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-contact .prep-list details[open] summary::after {
  content: "−";
  color: var(--lime);
}

.page-contact .prep-list summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -3px;
}

.page-contact .prep-list details p {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--cool-300);
}

.page-contact .prep-list details ul {
  margin: 0;
  padding: 0 18px 16px 34px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--cool-300);
}

.page-contact .prep-list details ul li {
  margin: 5px 0;
}

.page-contact .prep-list details ul li::marker {
  color: var(--cyan);
}

/* ---------- 合作与媒体 ---------- */
.page-contact .partner-grid {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-contact .partner-item {
  padding: 16px 16px 18px;
  border: 1px solid var(--line-strong);
  border-top: 2px solid var(--clay);
  background: var(--ink-800);
}

.page-contact .partner-item:nth-child(2n) {
  border-top-color: var(--moss);
}

.page-contact .partner-item:nth-child(3n) {
  border-top-color: var(--cyan);
}

.page-contact .partner-item h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--white);
}

.page-contact .partner-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cool-300);
}

/* ---------- 地址与备案纸带 ---------- */
.page-contact .registry {
  margin: 52px 0 60px;
  background:
    repeating-linear-gradient(0deg, rgba(7, 17, 31, .055) 0 1px, transparent 1px 24px),
    var(--paper);
  border: 1px solid var(--clay);
  box-shadow: 0 0 0 4px rgba(233, 226, 211, .07);
  color: var(--ink-900);
}

.page-contact .registry__inner {
  display: grid;
  gap: 0;
}

.page-contact .registry__text {
  display: grid;
  gap: 13px;
  align-content: start;
  padding: 26px 22px 28px;
}

.page-contact .registry__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--clay);
}

.page-contact .registry__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.8vw, 26px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink-900);
  overflow-wrap: break-word;
}

.page-contact .registry__icp {
  display: inline-block;
  margin: 0;
  padding: 7px 12px;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--lime);
  background: var(--ink-900);
}

.page-contact .registry__note {
  margin: 0;
  max-width: 42ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-700);
}

.page-contact .registry__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 4px;
}

.page-contact .registry__links a {
  font-size: 13px;
  color: var(--ink-800);
  text-decoration: none;
  border-bottom: 1px solid rgba(7, 17, 31, .35);
  padding-bottom: 2px;
  transition: color .18s ease, border-color .18s ease;
}

.page-contact .registry__links a:hover,
.page-contact .registry__links a:focus-visible {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

.page-contact .registry__media {
  margin: 0;
  min-height: 200px;
  overflow: hidden;
  border-top: 1px solid var(--clay);
  background: var(--ink-850);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact .reply-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-contact .registry__text {
    padding: 30px 30px 32px;
  }
}

@media (min-width: 900px) {
  .page-contact .registry__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-contact .registry__media {
    border-top: none;
    border-left: 1px solid var(--clay);
    min-height: 100%;
  }
}

@media (min-width: 980px) {
  .page-contact .contact-board {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    gap: 52px;
    padding: 14px 0 70px;
  }

  .page-contact .channels {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-contact .contact-block {
    padding: 58px 0;
  }
}

@media (min-width: 1100px) {
  .page-contact .reply-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel,
  .page-contact .channel::before,
  .page-contact .channel__value,
  .page-contact .prep-list details,
  .page-contact .registry__links a {
    transition: none;
  }

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