.page-contact {
  overflow-x: clip;
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding-block: var(--sp-6) var(--sp-8);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: min(760px, 82vw);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(53, 240, 200, 0.16), transparent 66%);
  pointer-events: none;
  z-index: 0;
}

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

.page-contact .contact-hero__grid {
  display: grid;
  gap: var(--sp-6);
  align-items: end;
}

.page-contact .contact-hero__copy .eyebrow {
  margin: 0 0 var(--sp-3);
}

.page-contact .contact-hero h1 {
  margin: 0 0 var(--sp-4);
  max-width: 17ch;
  font-size: clamp(2rem, 7vw, 3.1rem);
  line-height: 1.12;
}

.page-contact .contact-hero .lede {
  margin: 0 0 var(--sp-5);
  max-width: 44ch;
  color: var(--cream-dim);
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

.page-contact .contact-hero__media {
  margin: 0;
  border-left: 3px solid var(--cyan);
}

.page-contact .contact-hero__media .media-frame__img {
  object-fit: cover;
}

/* ---------- 三条通道 ---------- */
.page-contact .contact-channels {
  margin-top: var(--sp-7);
  align-items: start;
  row-gap: var(--sp-7);
}

.page-contact .contact-channel {
  position: relative;
  margin-bottom: var(--sp-4);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

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

.page-contact .contact-channel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--line);
  transition: background-color 0.2s ease, width 0.2s ease;
}

.page-contact .contact-channel:hover,
.page-contact .contact-channel:focus-within {
  background-color: var(--cyan-mist);
}

.page-contact .contact-channel:hover::before,
.page-contact .contact-channel:focus-within::before {
  background: var(--cyan);
  width: 5px;
}

.page-contact .contact-channel .panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
}

.page-contact .contact-channel__no {
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-contact .contact-channel__name {
  flex: 1 1 auto;
  margin: 0;
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-contact .contact-channel__value {
  margin: var(--sp-3) 0 var(--sp-3);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--cyan);
  word-break: break-all;
}

.page-contact .contact-channel__desc {
  margin: 0 0 var(--sp-4);
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--cream-dim);
}

.page-contact .contact-brief {
  margin-bottom: var(--sp-6);
}

.page-contact .contact-brief__title {
  margin: 0;
  font-size: var(--fs-lg);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.page-contact .brief-list {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-4);
}

.page-contact .brief-list li {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  gap: var(--sp-2);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid rgba(37, 80, 67, 0.6);
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--cream-dim);
}

.page-contact .brief-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .brief-list .data-num {
  font-size: var(--fs-xs);
  color: var(--orange);
  padding-top: 0.4em;
}

.page-contact .contact-quick {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-contact .contact-quick .stat {
  padding-left: var(--sp-4);
  border-left: 2px solid var(--line);
}

.page-contact .contact-quick .stat:first-child {
  border-left-color: var(--orange);
}

.page-contact .contact-quick .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  color: var(--cream);
  margin-bottom: var(--sp-1);
}

.page-contact .contact-quick .stat__label {
  display: block;
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--cream-faint);
}

/* ---------- 资料类咨询 ---------- */
.page-contact .contact-research__grid {
  margin-top: var(--sp-6);
  align-items: center;
  row-gap: var(--sp-7);
}

.page-contact .contact-research h2 {
  margin: 0 0 var(--sp-4);
}

.page-contact .contact-research .prose {
  margin-bottom: var(--sp-5);
}

.page-contact .contact-research .media-frame {
  margin: 0;
}

.page-contact .contact-research .media-frame__img {
  object-fit: cover;
}

/* ---------- 版本反馈与合作 ---------- */
.page-contact .contact-split {
  display: grid;
  gap: var(--sp-8);
}

.page-contact .contact-split__col > h2 {
  margin: 0 0 var(--sp-5);
}

.page-contact .contact-split .accordion__panel p {
  margin: 0 0 var(--sp-3);
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--cream-dim);
}

.page-contact .contact-split .accordion__panel .btn {
  margin-top: var(--sp-1);
}

.page-contact .contact-coop > .prose {
  margin-bottom: var(--sp-5);
}

.page-contact .coop-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--sp-5);
}

.page-contact .coop-list li {
  position: relative;
  padding-left: var(--sp-5);
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--cream-dim);
}

.page-contact .coop-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 16px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .coop-list strong {
  display: block;
  margin-bottom: var(--sp-1);
  font-size: var(--fs-base);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-contact .coop-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-4);
  margin-top: var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line);
}

.page-contact .coop-foot__mail {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--cyan);
  word-break: break-all;
}

/* ---------- 响应节奏时间轴 ---------- */
.page-contact .contact-timeline-section .lede {
  margin: var(--sp-4) 0 var(--sp-6);
  max-width: 52ch;
  color: var(--cream-dim);
}

.page-contact .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--sp-6);
  position: relative;
}

.page-contact .timeline__item {
  position: relative;
}

.page-contact .timeline__tick {
  display: block;
  width: 12px;
  height: 12px;
  margin-bottom: var(--sp-4);
  border: 2px solid var(--cyan);
  background: var(--ink-0);
  transform: rotate(45deg);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-contact .timeline__item:hover .timeline__tick {
  background: var(--orange);
  border-color: var(--orange);
}

.page-contact .timeline__time {
  display: block;
  margin-bottom: var(--sp-2);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-contact .timeline__label {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.page-contact .timeline__note {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--cream-dim);
}

.page-contact .timeline-outro {
  margin: var(--sp-7) 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--cream-dim);
}

.page-contact .timeline-outro a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 200, 0.5);
}

.page-contact .timeline-outro a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 底部信息带 ---------- */
.page-contact .contact-band {
  position: relative;
  margin-top: var(--sp-9);
  padding: calc(var(--sp-8) + 24px) 0 var(--sp-8);
  background-color: var(--ink-1);
  background-image: linear-gradient(100deg, rgba(138, 92, 255, 0.22), rgba(53, 240, 200, 0.07) 58%, transparent);
  clip-path: polygon(0 24px, 100% 0, 100% 100%, 0 100%);
}

.page-contact .contact-band::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 45%, transparent);
  opacity: 0.45;
}

.page-contact .contact-band__inner {
  display: grid;
  gap: var(--sp-6);
}

.page-contact .contact-band__cell {
  display: grid;
  gap: var(--sp-1);
}

.page-contact .contact-band__k {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: var(--sp-1);
}

.page-contact .contact-band__v {
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--cream);
}

.page-contact .contact-band__v--dim {
  color: var(--cream-faint);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-contact .contact-hero {
    padding-block: var(--sp-7) var(--sp-9);
  }

  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--sp-8);
  }

  .page-contact .contact-hero__media {
    align-self: end;
  }

  .page-contact .contact-channels__side {
    padding-left: var(--sp-4);
  }

  .page-contact .contact-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--sp-9);
  }

  .page-contact .contact-band__inner {
    grid-template-columns: 1.3fr 0.9fr 1.2fr;
    gap: var(--sp-8);
    align-items: start;
  }

  .page-contact .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--sp-6);
    margin-top: var(--sp-8);
  }

  .page-contact .timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 5px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), var(--line) 70%, transparent);
  }

  .page-contact .timeline__tick {
    position: relative;
    z-index: 1;
  }

  .page-contact .timeline-outro {
    margin-top: var(--sp-8);
  }
}

@media (min-width: 1200px) {
  .page-contact .contact-hero h1 {
    font-size: 3.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-channel,
  .page-contact .contact-channel::before,
  .page-contact .timeline__tick {
    transition: none;
  }
}