.page-contact {
  --pc-gap: clamp(24px, 4vw, 52px);
  --coop-pad: 52px;
}

.page-contact .crumbs {
  margin-top: clamp(16px, 3vw, 30px);
}

/* ---------- 首屏分屏 ---------- */
.page-contact .contact-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
  padding-block: clamp(20px, 4vw, 44px) clamp(34px, 5vw, 72px);
}

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

.page-contact .contact-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: clamp(28px, 6.4vw, 56px);
  color: var(--text);
  margin: 14px 0 0;
}

.page-contact .hero-lead {
  margin: 18px 0 0;
  max-width: 40ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--text);
  opacity: .88;
}

.page-contact .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-contact .hero-actions .btn {
  flex: 1 1 auto;
  min-width: 148px;
  text-align: center;
}

.page-contact .hero-meta {
  list-style: none;
  margin: 30px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
}

.page-contact .hero-meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-contact .hero-meta .mono {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  color: var(--amber);
  line-height: 1;
}

.page-contact .contact-hero__art {
  margin: 0;
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-contact .contact-hero__art img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-contact .contact-hero__art::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -34%;
  width: 62%;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  opacity: .3;
  pointer-events: none;
}

/* ---------- 反馈入口 ---------- */
.page-contact .contact-feedback-band {
  background: linear-gradient(132deg, var(--ink-deep) 0%, var(--panel) 62%, var(--ink-deep) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: clamp(34px, 5vw, 68px);
}

.page-contact .contact-feedback {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
  align-items: center;
}

.page-contact .mark-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--red);
  margin-right: 9px;
  vertical-align: middle;
}

.page-contact .contact-feedback__body p {
  margin: 16px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  opacity: .86;
}

.page-contact .feedback-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .feedback-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .feedback-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .contact-feedback__art {
  margin: 0;
  position: relative;
  background: var(--ink-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-contact .contact-feedback__art img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-contact .contact-feedback__art figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 两栏主体 ---------- */
.page-contact .contact-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 5vw, 56px);
  padding-block: clamp(38px, 5vw, 76px) clamp(44px, 6vw, 88px);
}

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

/* ---------- 合作方向编号清单 ---------- */
.page-contact .coop-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-contact .coop-item {
  position: relative;
  padding-left: var(--coop-pad);
  padding-bottom: 26px;
}

.page-contact .coop-item::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 36px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--teal), rgba(20, 117, 107, 0));
}

.page-contact .coop-item:last-child {
  padding-bottom: 0;
}

.page-contact .coop-item:last-child::before {
  display: none;
}

.page-contact .coop-num {
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 30px;
  display: grid;
  place-items: center;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
}

.page-contact .coop-item details summary {
  display: block;
  cursor: pointer;
  list-style: none;
}

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

.page-contact .coop-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.35;
  color: var(--text);
}

.page-contact .coop-hint {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  transition: color .2s ease-out;
}

.page-contact .coop-item details[open] .coop-name {
  color: var(--cyan);
}

.page-contact .coop-item details[open] .coop-hint {
  color: var(--teal);
}

.page-contact .coop-body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-contact .coop-body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  opacity: .84;
}

.page-contact .coop-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 提交前准备 ---------- */
.page-contact .prep {
  margin-top: clamp(40px, 5vw, 64px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-contact .prep-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-contact .prep-list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  opacity: .88;
}

.page-contact .prep-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 联系面板 ---------- */
.page-contact .contact-cols__side {
  min-width: 0;
}

.page-contact .contact-panel {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-contact .contact-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), var(--cyan) 58%, transparent);
}

.page-contact .contact-panel__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.35;
  color: var(--text);
}

.page-contact .channel-list {
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-contact .channel {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-contact .channel dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
  line-height: 1.6;
}

.page-contact .channel dd {
  margin: 8px 0 0;
}

.page-contact .channel__value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.5;
  color: var(--cyan);
  word-break: break-all;
  letter-spacing: .01em;
}

.page-contact .channel__value--text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  word-break: normal;
  letter-spacing: 0;
}

.page-contact .channel__hint {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .panel-region {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-contact .panel-region__line {
  margin: 0;
  font-size: 14px;
  color: var(--text);
  opacity: .86;
}

.page-contact .panel-region__mono {
  display: inline-block;
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--muted);
  border-bottom: 1px dashed var(--line-soft);
  cursor: help;
}

.page-contact .panel-note {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .contact-panel .btn {
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .hero-actions .btn {
    flex: 0 0 auto;
  }

  .page-contact .hero-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 22px;
  }
}

@media (min-width: 860px) {
  .page-contact .contact-feedback {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-contact .contact-feedback__art img {
    aspect-ratio: 4 / 3;
  }
}

@media (min-width: 960px) {
  .page-contact {
    --coop-pad: 66px;
  }

  .page-contact .contact-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-contact .contact-hero__art img {
    aspect-ratio: 16 / 7;
  }

  .page-contact .hero-actions .btn--ghost {
    display: inline-block;
  }

  .page-contact .contact-cols {
    grid-template-columns: minmax(0, 1.3fr) minmax(300px, .85fr);
    align-items: start;
    gap: clamp(40px, 4vw, 68px);
  }

  .page-contact .contact-panel {
    position: sticky;
    top: calc(var(--top-h) + 28px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-contact .coop-hint {
    transition: none;
  }
}