.page-contact {
  --ch-gap: 20px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink-950);
  border-bottom: 1px solid var(--line);
}

.page-contact .contact-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  margin: 0;
  overflow: hidden;
}

.page-contact .contact-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .4;
}

.page-contact .contact-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(3, 17, 14, .66) 0%, rgba(3, 17, 14, .88) 58%, var(--ink-950) 100%),
    radial-gradient(120% 80% at 84% 10%, rgba(53, 240, 200, .16), transparent 62%);
}

.page-contact .contact-hero__inner {
  position: relative;
  padding: 36px 0 44px;
}

.page-contact .breadcrumb {
  margin-bottom: 20px;
}

.page-contact .contact-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 8.6vw, 62px);
  line-height: 1.03;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .contact-hero__lede {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- N-01 双栏信息板 ---------- */
.page-contact .contact-grid {
  display: grid;
  gap: 28px;
}

.page-contact .channel-stack {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-contact .channel-card {
  position: relative;
  padding: 20px 20px 20px 24px;
  background: var(--ink-700);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--mint-400), var(--teal-700));
}

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

.page-contact .channel-card__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mint-400);
}

.page-contact .channel-card__value {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(14px, 3.4vw, 17px);
  line-height: 1.45;
  letter-spacing: .01em;
  color: var(--paper);
  overflow-wrap: anywhere;
  font-variant-numeric: tabular-nums;
}

.page-contact .channel-card__use {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper);
  opacity: .9;
}

.page-contact .channel-card__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

/* ---------- 右栏：时段刻度 + 准备清单 ---------- */
.page-contact .sla-panel {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-contact .clock-bar {
  padding: 20px;
  background: var(--glass-cyan);
  border: 1px solid var(--line);
}

.page-contact .clock-bar__head {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
}

.page-contact .clock-bar__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .clock-bar__sub {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

.page-contact .clock-bar__track {
  position: relative;
  height: 12px;
  background: rgba(233, 247, 242, .06);
  border: 1px solid var(--line);
}

.page-contact .clock-bar__fill {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 37.5%;
  width: 37.5%;
  display: block;
  background: linear-gradient(90deg, var(--teal-700), var(--mint-400));
  outline: none;
}

.page-contact .clock-bar__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%) translateY(5px);
  padding: 5px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--ember-300);
  background: var(--ink-950);
  border: 1px solid var(--ember-line);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .clock-bar__fill:hover .clock-bar__tip,
.page-contact .clock-bar__fill:focus-visible .clock-bar__tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-contact .clock-bar__scale {
  display: flex;
  justify-content: space-between;
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  font-variant-numeric: tabular-nums;
}

.page-contact .prep-block__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.4vw, 24px);
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .prep-block__sub {
  margin: 0 0 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

.page-contact .prep-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .prep-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(233, 247, 242, .03);
  border: 1px solid transparent;
  border-left: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-contact .prep-item:hover {
  border-left-color: var(--mint-400);
  background: rgba(53, 240, 200, .05);
}

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

.page-contact .prep-item__box:checked {
  background: var(--mint-400);
  border-color: var(--mint-400);
}

.page-contact .prep-item__box:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--ink-950);
  border-bottom: 2px solid var(--ink-950);
  transform: rotate(45deg);
}

.page-contact .prep-item__box:focus-visible {
  outline: 2px solid var(--mint-200);
  outline-offset: 2px;
}

.page-contact .prep-item label {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--paper);
  cursor: pointer;
}

.page-contact .sla-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-contact .sla-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.68;
  color: var(--paper);
  opacity: .9;
}

.page-contact .sla-steps__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mint-400);
  padding-top: 3px;
  font-variant-numeric: tabular-nums;
}

/* ---------- N-02 数据疑问 ---------- */
.page-contact .evidence-grid {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-contact .figure {
  margin: 0;
}

.page-contact .figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: var(--ink-700);
  border: 1px solid var(--line);
}

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

.page-contact .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

.page-contact .evidence-prose {
  max-width: 68ch;
}

.page-contact .evidence-prose strong {
  color: var(--mint-200);
  font-weight: 600;
}

.page-contact .evidence-prose a {
  color: var(--mint-400);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}

.page-contact .evidence-prose a:hover {
  color: var(--mint-200);
}

/* ---------- N-03 合作 ---------- */
.page-contact .coop-grid {
  display: grid;
  gap: 16px;
}

.page-contact .coop-card {
  padding: 22px;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-top: 2px solid var(--teal-700);
  transition: border-color var(--dur) var(--ease);
}

.page-contact .coop-card:hover {
  border-top-color: var(--mint-400);
}

.page-contact .coop-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .coop-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mute);
}

.page-contact .coop-note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--ember-500);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper);
}

.page-contact .coop-note__mail {
  font-family: var(--font-mono);
  color: var(--ember-300);
  overflow-wrap: anywhere;
}

/* ---------- N-04 备案带 ---------- */
.page-contact .filing-band {
  padding: 40px 0 44px;
  border-top: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(14, 125, 106, .18), rgba(3, 17, 14, 0) 72%);
}

.page-contact .filing-band__body {
  display: grid;
  gap: 12px;
}

.page-contact .filing-band__icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(16px, 3.4vw, 20px);
  letter-spacing: .04em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-contact .filing-band__scope {
  margin: 0;
  max-width: 74ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

.page-contact .filing-band__scope a {
  color: var(--mint-400);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}

.page-contact .filing-band__scope a:hover {
  color: var(--mint-200);
}

/* ---------- 收尾引导 ---------- */
.page-contact .cta-block {
  padding: 30px 22px;
  background: var(--glass-cyan);
  border: 1px solid var(--line);
}

.page-contact .cta-block__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.12;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .cta-block__text {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

.page-contact .cta-block__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .contact-hero__inner {
    padding: 52px 0 64px;
  }

  .page-contact .contact-hero__lede {
    font-size: 17px;
  }

  .page-contact .clock-bar {
    padding: 24px;
  }

  .page-contact .cta-block {
    padding: 40px 36px;
  }

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

@media (min-width: 900px) {
  .page-contact .contact-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
  }

  .page-contact .evidence-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
  }

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

  .page-contact .filing-band__body {
    grid-template-columns: minmax(180px, auto) minmax(0, 1fr);
    gap: 10px 36px;
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-card,
  .page-contact .coop-card,
  .page-contact .prep-item,
  .page-contact .clock-bar__tip {
    transition: none;
  }
}
</main>