.page-contact {
  --paper-ink: #0B1730;
  --paper-mid: #4A5878;
  --block-y: clamp(40px, 6vw, 84px);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(44px, 6vw, 80px);
  background:
    radial-gradient(120% 100% at 88% 0%, rgba(255, 122, 47, .18), transparent 58%),
    radial-gradient(90% 80% at 6% 100%, rgba(79, 216, 232, .12), transparent 62%),
    linear-gradient(180deg, var(--navy-900) 0%, var(--ink-abyss) 100%);
  border-bottom: 1px solid var(--line-blue);
  overflow: hidden;
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(42, 66, 114, .38) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 66, 114, .38) 1px, transparent 1px);
  background-size: 68px 68px;
  opacity: .55;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(78% 68% at 72% 28%, #000 0%, transparent 76%);
  mask-image: radial-gradient(78% 68% at 72% 28%, #000 0%, transparent 76%);
}

.page-contact .contact-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-contact .contact-hero .crumbs {
  margin: 0 0 clamp(20px, 3vw, 34px);
}

.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-contact .contact-hero__lead,
.page-contact .channel-card {
  min-width: 0;
}

.page-contact .contact-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 6px 13px;
  border: 1px solid var(--line-blue);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--neon-lime);
  background: rgba(185, 255, 60, .06);
}

.page-contact .contact-hero__eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon-lime);
}

.page-contact .contact-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 5.4vw, 54px);
  line-height: 1.1;
  color: var(--text-hi);
}

.page-contact .contact-hero__lede {
  max-width: 46ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-mid);
}

.page-contact .contact-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--text-mid);
}

.page-contact .contact-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-contact .contact-hero__facts .num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-hi);
  line-height: 1;
}

/* ---------- 渠道卡片 ---------- */
.page-contact .channel-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-l);
  background: linear-gradient(158deg, var(--navy-800) 0%, var(--navy-900) 100%);
  box-shadow: var(--shadow-card);
}

.page-contact .channel-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
}

.page-contact .channel-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-hi);
}

.page-contact .channel-card__time {
  display: inline-block;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--warm-orange);
  color: var(--ink-abyss);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
}

.page-contact .channel-card__media {
  margin: 0 0 6px;
}

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

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

.page-contact .channel-row {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-top: 1px dashed var(--line-blue);
}

.page-contact .channel-row__key {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-mid);
}

.page-contact .channel-row__val {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-hi);
  overflow-wrap: anywhere;
}

.page-contact .channel-copy {
  padding: 3px 11px;
  border: 1px solid var(--line-blue);
  border-radius: 999px;
  background: transparent;
  color: var(--neon-lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: border-color .2s ease, background-color .2s ease;
}

.page-contact .channel-copy:hover,
.page-contact .channel-copy:focus-visible {
  border-color: var(--neon-lime);
  background: rgba(185, 255, 60, .12);
}

.page-contact .channel-copy:focus-visible {
  outline: 2px solid var(--neon-lime);
  outline-offset: 2px;
}

/* ---------- 01 问题类型 ---------- */
.page-contact .contact-topics {
  padding: var(--block-y) 0;
  background: var(--navy-900);
}

.page-contact .contact-topics__lede {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-mid);
}

.page-contact .contact-topics__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.page-contact .contact-topics__filter .chip {
  cursor: pointer;
}

.page-contact .contact-topics__filter .chip[aria-pressed="true"] {
  background: var(--neon-lime);
  border-color: var(--neon-lime);
  color: var(--ink-abyss);
}

.page-contact .contact-topics__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .topic-card {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-m);
  background: var(--navy-800);
  transition: border-color .2s ease, transform .2s ease;
}

.page-contact .topic-card:hover {
  border-color: rgba(185, 255, 60, .55);
}

.page-contact .topic-card__index {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--warm-orange);
}

.page-contact .topic-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text-hi);
}

.page-contact .topic-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-mid);
}

.page-contact .topic-card__meta {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-blue);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan-data);
}

/* ---------- 02 提交准备 ---------- */
.page-contact .contact-prep {
  padding: var(--block-y) 0;
  background: var(--ink-abyss);
  border-top: 1px solid var(--line-blue);
}

.page-contact .prep-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

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

.page-contact .prep-body {
  min-width: 0;
}

.page-contact .prep-body__lede {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-mid);
}

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

.page-contact .prep-item {
  border-bottom: 1px dashed var(--line-blue);
}

.page-contact .prep-item__label {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  padding: 15px 2px;
  cursor: pointer;
}

.page-contact .prep-item__box {
  flex: none;
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  border: 1px solid var(--line-blue);
  border-radius: 5px;
  background: var(--navy-800);
  position: relative;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  transition: background-color .18s ease, border-color .18s ease;
}

.page-contact .prep-item__box:checked {
  background: var(--neon-lime);
  border-color: var(--neon-lime);
}

.page-contact .prep-item__box:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border: solid var(--ink-abyss);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

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

.page-contact .prep-item__text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-mid);
}

.page-contact .prep-item__text strong {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--text-hi);
}

/* ---------- 03 合作共建 ---------- */
.page-contact .contact-partners {
  padding: var(--block-y) 0;
  background: var(--navy-900);
}

.page-contact .partners-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 44px);
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-l);
  background: var(--paper);
  color: var(--paper-ink);
}

.page-contact .partners-card__tag {
  display: inline-block;
  margin-bottom: 16px;
  padding: 5px 12px;
  border: 1px solid var(--paper-ink);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--paper-ink);
}

.page-contact .partners-card h2 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.2;
  color: var(--paper-ink);
}

.page-contact .partners-card__main > p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-mid);
}

.page-contact .partners-steps {
  margin: 26px 0 28px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-contact .partners-steps li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(11, 23, 48, .14);
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-ink);
}

.page-contact .partners-steps__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--warm-orange);
}

.page-contact .partners-card__aside {
  display: grid;
  align-content: start;
  gap: 4px;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid rgba(11, 23, 48, .18);
  border-radius: var(--radius-m);
  background: #FFFFFF;
}

.page-contact .partners-card__big {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-contact .partners-card__big .num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper-ink);
}

.page-contact .partners-card__unit {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper-mid);
}

.page-contact .partners-card__sub {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-mid);
}

.page-contact .partners-card__sub:last-child {
  margin-bottom: 0;
}

/* ---------- 04 自助指路 ---------- */
.page-contact .contact-selfserve {
  padding: var(--block-y) 0;
  background: var(--ink-abyss);
  border-top: 1px solid var(--line-blue);
}

.page-contact .selfserve-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(79, 216, 232, .14), transparent 60%),
    linear-gradient(150deg, var(--navy-800) 0%, var(--ink-abyss) 100%);
}

.page-contact .selfserve-panel__text .section-head__index {
  display: block;
  margin-bottom: 12px;
}

.page-contact .selfserve-panel h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3vw, 32px);
  line-height: 1.22;
  color: var(--text-hi);
}

.page-contact .selfserve-panel__text p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-mid);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .contact-topics__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-contact .prep-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-contact .partners-card {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-contact .selfserve-panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-contact .selfserve-panel__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-contact .contact-topics__list {
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .topic-card,
  .page-contact .channel-copy,
  .page-contact .prep-item__box {
    transition: none;
  }
}