.page-contact {
  --pc-plate-bg: linear-gradient(158deg, rgba(30, 39, 51, .94) 0%, rgba(20, 26, 34, .97) 52%, rgba(11, 14, 19, .99) 100%);
  --pc-split: linear-gradient(180deg, var(--flame) 0%, var(--ember) 46%, var(--cyan) 100%);
  --pc-gap: clamp(28px, 4.4vw, 56px);
  padding-bottom: clamp(72px, 9vw, 120px);
}

.page-contact .breadcrumb {
  padding-block: 20px 0;
}

/* ── 首屏 ───────────────────────────────── */
.page-contact .contact-hero {
  position: relative;
  margin-top: 16px;
  isolation: isolate;
  overflow: hidden;
  border-block: 1px solid var(--line);
}

.page-contact .contact-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-contact .contact-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .4;
  filter: saturate(.9) contrast(1.05);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(178deg, rgba(11, 14, 19, .34) 0%, rgba(11, 14, 19, .84) 60%, var(--ink-900) 100%),
    linear-gradient(102deg, rgba(255, 90, 31, .18) 0%, rgba(11, 14, 19, 0) 44%, rgba(55, 194, 214, .16) 100%);
}

.page-contact .contact-hero__inner {
  position: relative;
  max-width: 44rem;
  padding-block: clamp(60px, 8.5vw, 116px) clamp(48px, 6.5vw, 86px);
}

.page-contact .contact-hero .eyebrow {
  color: var(--ember-soft);
}

.page-contact .contact-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -.012em;
  color: var(--white);
  text-wrap: balance;
}

.page-contact .contact-hero__lede {
  margin: 22px 0 0;
  max-width: 38em;
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.86;
  color: var(--mist);
}

.page-contact .contact-flags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .contact-flags .tag {
  cursor: default;
}

/* ── 主体两栏 ───────────────────────────── */
.page-contact .contact-grid {
  display: grid;
  gap: var(--pc-gap);
  padding-top: clamp(40px, 6vw, 78px);
}

/* 联系资料卡 — 仪表铭牌 */
.page-contact .contact-plate {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: var(--pc-plate-bg);
  box-shadow: var(--shadow-card);
  padding: clamp(24px, 3.2vw, 36px);
}

.page-contact .contact-plate::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--pc-split);
}

.page-contact .contact-plate::after {
  content: "";
  position: absolute;
  top: -70px;
  right: -70px;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 90, 31, .16) 0%, rgba(255, 90, 31, 0) 68%);
  pointer-events: none;
}

.page-contact .contact-plate__eyebrow {
  margin: 0 0 22px;
  font-size: 12px;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-contact .contact-plate__list {
  margin: 0;
  display: grid;
}

.page-contact .contact-plate__row {
  padding-block: 16px;
  border-top: 1px solid var(--line);
}

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

.page-contact .contact-plate__row dt {
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-contact .contact-plate__row dd {
  margin: 0;
}

.page-contact .contact-plate__text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--white);
}

.page-contact .contact-mono {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  line-height: 1.6;
  letter-spacing: .015em;
  color: var(--cyan-soft);
  word-break: break-all;
}

.page-contact .contact-mono--lg {
  font-size: clamp(20px, 2.2vw, 24px);
  letter-spacing: .05em;
  color: var(--white);
}

.page-contact .contact-plate__note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ── 右栏沟通事项流 ─────────────────────── */
.page-contact .contact-stream {
  min-width: 0;
  display: grid;
  gap: clamp(38px, 5vw, 70px);
}

.page-contact .channel {
  position: relative;
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

.page-contact .channel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 74px;
  height: 2px;
  background: linear-gradient(90deg, var(--flame), rgba(55, 194, 214, 0));
}

.page-contact .channel__head {
  max-width: 36em;
}

.page-contact .channel__head .eyebrow {
  color: var(--ember);
}

.page-contact .channel__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 2.9vw, 31px);
  line-height: 1.28;
  letter-spacing: -.008em;
  color: var(--white);
}

.page-contact .channel__body {
  margin-top: 20px;
  max-width: 40em;
}

.page-contact .channel__body > p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--mist);
}

.page-contact .channel__body > p:last-child {
  margin-bottom: 0;
}

/* 反馈分类条目 */
.page-contact .channel-list {
  display: grid;
  gap: 12px;
  margin: 22px 0 28px;
  padding: 0;
  list-style: none;
}

.page-contact .channel-list li {
  display: grid;
  gap: 10px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
  transition: border-color var(--dur) ease, transform var(--dur) ease, box-shadow var(--dur) ease;
}

.page-contact .channel-list li:hover {
  border-color: rgba(255, 90, 31, .42);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.page-contact .channel-list li .tag {
  justify-self: start;
  cursor: default;
}

.page-contact .channel-list li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-contact .channel__body .media-frame {
  margin-top: 6px;
}

/* 合作展开卡 */
.page-contact .coop-stack {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-contact .coop {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(118deg, rgba(30, 39, 51, .72) 0%, rgba(11, 14, 19, .82) 100%);
  transition: border-color var(--dur) ease;
}

.page-contact .coop:hover {
  border-color: var(--line-strong);
}

.page-contact .coop[open] {
  border-color: rgba(255, 90, 31, .44);
}

.page-contact .coop summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-contact .coop summary:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: -3px;
  box-shadow: inset 0 0 0 4px rgba(55, 194, 214, .22);
}

.page-contact .coop__no {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ember);
}

.page-contact .coop__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(16px, 1.9vw, 18px);
  color: var(--white);
}

.page-contact .coop__more {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-left: auto;
}

.page-contact .coop__more::before,
.page-contact .coop__more::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: calc(50% - 1px);
  height: 2px;
  border-radius: 2px;
  background: var(--ember);
  transition: transform var(--dur) ease, opacity var(--dur) ease;
}

.page-contact .coop__more::after {
  transform: rotate(90deg);
}

.page-contact .coop[open] .coop__more::after {
  transform: rotate(0deg);
  opacity: 0;
}

.page-contact .coop__panel {
  padding: 0 20px 20px;
  border-top: 1px solid var(--line);
}

.page-contact .coop__panel p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.84;
  color: var(--mist);
}

/* 回复时效 */
.page-contact .reply-list {
  display: grid;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .reply-list li {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--line);
}

.page-contact .reply-list li:first-child {
  border-top: 1px dashed var(--line);
}

.page-contact .reply-list__time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--flame);
}

.page-contact .reply-list__main {
  min-width: 0;
}

.page-contact .reply-list__what {
  margin: 0;
  font-size: 15.5px;
  font-weight: 500;
  color: var(--white);
}

.page-contact .reply-list__how {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

/* ── 收尾入口 ───────────────────────────── */
.page-contact .contact-next {
  display: grid;
  gap: 16px;
  margin-top: clamp(48px, 6.5vw, 88px);
  padding: clamp(24px, 3.6vw, 44px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background:
    linear-gradient(112deg, rgba(255, 90, 31, .13) 0%, rgba(11, 14, 19, .9) 52%, rgba(55, 194, 214, .12) 100%),
    var(--ink-800);
}

.page-contact .contact-next__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 27px);
  color: var(--white);
}

.page-contact .contact-next__lede {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-contact .contact-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.page-contact .contact-next__meta {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .contact-next__meta a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 194, 214, .38);
  transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease;
}

.page-contact .contact-next__meta a:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

.page-contact .contact-next__meta a:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(55, 194, 214, .24);
  border-radius: 3px;
}

/* ── 响应式 ─────────────────────────────── */
@media (min-width: 720px) {
  .page-contact .reply-list li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }

  .page-contact .channel-list li {
    padding: 20px 24px;
  }
}

@media (min-width: 960px) {
  .page-contact .contact-grid {
    grid-template-columns: minmax(0, 344px) minmax(0, 1fr);
    align-items: start;
  }

  .page-contact .contact-plate {
    position: sticky;
    top: 96px;
  }
}

@media (max-width: 560px) {
  .page-contact .contact-hero__inner {
    padding-block: 48px 40px;
  }

  .page-contact .contact-flags {
    gap: 8px;
  }

  .page-contact .contact-plate {
    border-radius: var(--r-md);
  }

  .page-contact .contact-next__links .btn {
    flex: 1 1 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-list li,
  .page-contact .coop,
  .page-contact .coop__more::before,
  .page-contact .coop__more::after {
    transition: none;
  }

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