.page-contact {
  --c-soft: rgba(241, 246, 243, .78);
  --c-gap: clamp(18px, 2.6vw, 40px);
  --c-pad: clamp(20px, 2.4vw, 34px);
  --c-sticky-top: calc(var(--topbar-h) + 28px);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-contact .contact-crumbs {
  padding-top: clamp(22px, 3.6vw, 44px);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  margin-top: clamp(16px, 2.4vw, 28px);
  padding: clamp(26px, 4.6vw, 60px) 0 clamp(32px, 5vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 95% at 86% 0%, rgba(12, 58, 43, .9), rgba(6, 17, 12, 0) 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(16, 50, 58, .7), rgba(6, 17, 12, 0) 70%),
    var(--ink);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(70, 168, 255, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(70, 168, 255, .07) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .8), rgba(0, 0, 0, 0) 86%);
}

.page-contact .contact-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 54px);
  align-items: center;
}

.page-contact .contact-hero__copy {
  min-width: 0;
}

.page-contact .contact-hero h1 {
  margin: 10px 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(32px, 5.4vw, 64px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-contact .contact-hero .lead {
  max-width: 34ch;
  color: var(--c-soft);
}

.page-contact .contact-hero__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px 26px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .contact-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
}

.page-contact .contact-hero__stat-label {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--moss);
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-contact .contact-hero__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 14 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--pitch), var(--ink));
  box-shadow: 0 2px 12px rgba(0, 0, 0, .45);
}

.page-contact .contact-hero__figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-contact .contact-hero__figure .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 12px 16px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--paper);
  background: linear-gradient(0deg, rgba(6, 17, 12, .92), rgba(6, 17, 12, 0));
}

/* ---------- 主体布局 ---------- */
.page-contact .contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--c-gap);
  padding: clamp(36px, 5vw, 76px) 0 clamp(48px, 7vw, 96px);
}

.page-contact .contact-flow,
.page-contact .contact-side {
  min-width: 0;
}

.page-contact .contact-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(42px, 5.4vw, 80px);
}

.page-contact .contact-block {
  min-width: 0;
}

.page-contact .contact-block .section-title {
  margin: 8px 0 12px;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.18;
  letter-spacing: -.01em;
}

.page-contact .contact-block .lead {
  max-width: 36ch;
  color: var(--c-soft);
}

/* ---------- 通道卡片 ---------- */
.page-contact .channel {
  --accent: var(--blue);
  position: relative;
  margin-top: 18px;
  padding: var(--c-pad);
  padding-left: calc(var(--c-pad) + 8px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(16, 50, 58, .52), rgba(6, 17, 12, .38));
  box-shadow: 0 2px 12px rgba(0, 0, 0, .34);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-contact .channel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
}

.page-contact .channel--data { --accent: var(--blue); }
.page-contact .channel--sub { --accent: var(--yellow); }

.page-contact .channel--coop {
  --accent: var(--red);
  background: linear-gradient(150deg, rgba(110, 27, 38, .5), rgba(6, 17, 12, .42));
}

.page-contact .channel:hover,
.page-contact .channel:focus-within {
  border-color: var(--accent);
  box-shadow: 0 2px 18px rgba(0, 0, 0, .5);
}

.page-contact .channel__idx {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-contact .channel__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-contact .channel__desc {
  margin: 0;
  max-width: 48ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--c-soft);
}

.page-contact .channel__tags {
  margin: 16px 0 0;
}

.page-contact .channel__points {
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .38s var(--ease), opacity .26s var(--ease), margin-top .38s var(--ease);
}

.page-contact .channel:hover .channel__points,
.page-contact .channel:focus-within .channel__points {
  max-height: 420px;
  margin-top: 18px;
  opacity: 1;
}

.page-contact .channel__points-title {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--moss);
}

.page-contact .channel__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-contact .channel__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-soft);
}

.page-contact .channel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 1px;
  background: var(--accent);
}

.page-contact .channel__link {
  display: inline-block;
  margin-top: 18px;
  font-size: 14px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 168, 255, .4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-contact .channel__link:hover,
.page-contact .channel__link:focus-visible {
  color: var(--yellow);
  border-color: var(--yellow);
}

/* ---------- 处理顺序 ---------- */
.page-contact .steps {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-contact .steps__item {
  border-bottom: 1px solid var(--line);
}

.page-contact .step__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  transition: color var(--dur) var(--ease);
}

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

.page-contact .step__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--moss);
}

.page-contact .step__name {
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  color: var(--paper);
}

.page-contact .step__time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--moss);
  white-space: nowrap;
}

.page-contact .step__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--yellow);
}

.page-contact .step[open] .step__summary::after {
  content: "−";
}

.page-contact .step[open] .step__idx {
  color: var(--yellow);
}

.page-contact .step__body {
  padding: 0 0 4px;
}

.page-contact .step__body p {
  margin: 0 0 18px;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-soft);
}

/* ---------- 合作面板 ---------- */
.page-contact .coop-panel {
  padding: clamp(24px, 3.2vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(140deg, rgba(110, 27, 38, .58), rgba(6, 17, 12, .55) 72%),
    var(--ink);
  box-shadow: 0 2px 12px rgba(0, 0, 0, .42);
}

.page-contact .coop-panel .section-title {
  color: var(--paper);
}

.page-contact .coop-panel .lead {
  color: var(--c-soft);
}

.page-contact .coop-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid rgba(241, 246, 243, .16);
}

.page-contact .coop-col {
  min-width: 0;
}

.page-contact .coop-col__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--moss);
}

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

.page-contact .coop-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

.page-contact .coop-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 2px;
  background: var(--red);
}

/* ---------- 检查清单 ---------- */
.page-contact .checklist {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.page-contact .checklist__item {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  background: rgba(6, 17, 12, .78);
}

.page-contact .checklist__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--yellow);
}

.page-contact .checklist__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-soft);
}

.page-contact .contact-thanks {
  margin: 22px 0 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--moss);
}

.page-contact .contact-thanks a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 168, 255, .4);
}

.page-contact .contact-thanks a:hover,
.page-contact .contact-thanks a:focus-visible {
  color: var(--yellow);
  border-color: var(--yellow);
}

/* ---------- 右侧联系信息栏 ---------- */
.page-contact .contact-side__inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-contact .contact-side__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 10 / 7;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--slate), var(--ink));
  box-shadow: 0 2px 12px rgba(0, 0, 0, .4);
}

.page-contact .contact-side__figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-contact .side-card {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(16, 50, 58, .42);
  box-shadow: 0 2px 12px rgba(0, 0, 0, .3);
}

.page-contact .side-card--mail {
  border-top: 2px solid var(--yellow);
}

.page-contact .side-card__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--moss);
}

.page-contact .side-card__value {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
  word-break: break-word;
}

.page-contact .side-card__value--mail {
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--blue);
}

.page-contact .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.page-contact .side-card__note {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--c-soft);
}

.page-contact .side-card .copy-btn {
  margin-top: 12px;
}

.page-contact .side-card__icp {
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--moss);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-contact .contact-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 900px) {
  .page-contact .contact-hero__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .95fr);
  }
}

@media (min-width: 1024px) {
  .page-contact .contact-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-contact .contact-side__inner {
    position: sticky;
    top: var(--c-sticky-top);
    max-height: calc(100vh - var(--c-sticky-top) - 20px);
    overflow-y: auto;
    scrollbar-width: thin;
    padding-right: 4px;
  }
}

@media (max-width: 767px) {
  .page-contact .channel__points {
    max-height: none;
    margin-top: 18px;
    opacity: 1;
  }

  .page-contact .step__time {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel,
  .page-contact .channel__points,
  .page-contact .step__summary,
  .page-contact .channel__link,
  .page-contact .contact-thanks a {
    transition: none;
  }

  .page-contact .channel__points {
    max-height: none;
    margin-top: 18px;
    opacity: 1;
  }
}