.page-contact {
  --coop-indigo: #8AA2FF;
  --coop-gap: clamp(20px, 3.4vw, 42px);
}

/* ============ 首屏 ============ */
.page-contact .coop-hero {
  padding-top: clamp(20px, 3.6vw, 42px);
}

.page-contact .coop-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .coop-hero__lead {
  background: linear-gradient(155deg, var(--indigo-2) 0%, var(--ink) 68%);
  padding: clamp(22px, 3.6vw, 46px);
}

.page-contact .coop-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.04;
  letter-spacing: .005em;
  color: var(--paper);
}

.page-contact .coop-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--silver);
}

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

.page-contact .coop-hero__meter {
  background: var(--lime);
  color: var(--ink);
  padding: clamp(22px, 3.6vw, 40px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.page-contact .coop-hero__meter .index-label {
  color: rgba(14, 27, 61, .68);
  margin: 0;
}

.page-contact .coop-hero__num {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(74px, 15vw, 128px);
  line-height: .84;
  letter-spacing: -.035em;
  color: var(--ink);
}

.page-contact .coop-hero__unit {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.55;
  color: rgba(14, 27, 61, .82);
}

.page-contact .coop-hero__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(14, 27, 61, .22);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(14, 27, 61, .72);
}

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

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

/* ============ 合作方向带 ============ */
.page-contact .coop-dirs .section__head {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-contact .coop-dirs__band {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .coop-dir {
  position: relative;
  background: var(--charcoal);
  padding: clamp(22px, 3vw, 30px) clamp(20px, 2.6vw, 28px) clamp(26px, 3vw, 34px);
  overflow: hidden;
  transition: background var(--t-mid) linear, box-shadow var(--t-mid) linear;
}

.page-contact .coop-dir::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent, var(--silver));
  transform: scaleX(.24);
  transform-origin: left center;
  transition: transform var(--t-mid) linear;
}

.page-contact .coop-dir::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 22px;
  height: 22px;
  background: linear-gradient(315deg, var(--ink) 49%, transparent 50%);
}

.page-contact .coop-dir:hover,
.page-contact .coop-dir:focus-within {
  background: var(--indigo-2);
  box-shadow: inset 0 0 0 1px var(--accent, var(--silver));
}

.page-contact .coop-dir:hover::before,
.page-contact .coop-dir:focus-within::before {
  transform: scaleX(1);
}

.page-contact .coop-dir--lime { --accent: var(--lime); }
.page-contact .coop-dir--orange { --accent: var(--orange); }
.page-contact .coop-dir--silver { --accent: var(--silver); }
.page-contact .coop-dir--indigo { --accent: var(--coop-indigo); }

.page-contact .coop-dir__no {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-contact .coop-dir__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(21px, 2.4vw, 26px);
  line-height: 1.16;
  color: var(--paper);
}

.page-contact .coop-dir__scene {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--silver);
}

.page-contact .coop-dir__form {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.66;
  color: var(--paper);
}

.page-contact .coop-dir__tag {
  display: inline-block;
  margin: 16px 0 0;
}

/* ============ 流程 + 联系栏 ============ */
.page-contact .coop-flow {
  padding-top: clamp(44px, 7vw, 86px);
}

.page-contact .coop-flow__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.6vw, 54px);
  align-items: start;
}

.page-contact .coop-flow__main .section__head {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

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

.page-contact .coop-step {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 22px);
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .coop-step__no {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--ink);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  line-height: 1;
  color: var(--orange);
  transition: border-color var(--t-fast) linear, color var(--t-fast) linear;
}

.page-contact .coop-step::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-contact .coop-step:hover .coop-step__no {
  border-color: var(--orange);
  color: var(--lime);
}

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

.page-contact .coop-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.2;
  color: var(--paper);
}

.page-contact .coop-step__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

.page-contact .coop-step__more {
  margin-top: 12px;
}

.page-contact .coop-step__more summary,
.page-contact .coop-faq__item summary {
  list-style: none;
  cursor: pointer;
}

.page-contact .coop-step__more summary::-webkit-details-marker,
.page-contact .coop-faq__item summary::-webkit-details-marker {
  display: none;
}

.page-contact .coop-step__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color var(--t-fast) linear;
}

.page-contact .coop-step__more summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
  color: var(--orange);
}

.page-contact .coop-step__more[open] summary::after {
  content: "−";
}

.page-contact .coop-step__more summary:hover {
  color: var(--lime);
}

.page-contact .coop-step__more p {
  margin: 10px 0 0;
  padding: 12px 14px;
  background: var(--charcoal);
  border-left: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.68;
  color: var(--silver);
}

.page-contact .coop-flow__media {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
}

/* ============ 联系资料卡 ============ */
.page-contact .coop-rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .coop-rail__title {
  margin: 0;
  padding: 15px clamp(18px, 2.4vw, 26px);
  background: var(--indigo-2);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper);
}

.page-contact .coop-rail__card {
  background: var(--charcoal);
  padding: clamp(20px, 2.6vw, 28px);
}

.page-contact .coop-rail__card .index-label {
  margin: 0 0 8px;
}

.page-contact .coop-rail__rows {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
}

.page-contact .coop-rail__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 5px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .coop-rail__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-contact .coop-rail__row dd {
  margin: 0;
  min-width: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
}

.page-contact .coop-rail__mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  word-break: break-all;
  color: var(--lime);
}

.page-contact .coop-rail__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

.page-contact .coop-rail__card--paper {
  background: var(--cream);
  color: var(--brown);
}

.page-contact .coop-rail__card--paper .index-label {
  color: rgba(42, 33, 24, .62);
}

.page-contact .coop-rail__addr {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.42;
  color: var(--brown);
}

.page-contact .coop-rail__card--paper .coop-rail__note {
  padding-top: 14px;
  border-top: 1px solid rgba(42, 33, 24, .2);
  color: rgba(42, 33, 24, .76);
}

/* ============ 常见问题 ============ */
.page-contact .coop-faq {
  padding-top: clamp(44px, 7vw, 84px);
}

.page-contact .coop-faq .section__head {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-contact .coop-faq__list {
  border-top: 1px solid var(--line);
  max-width: 940px;
}

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

.page-contact .coop-faq__item summary {
  position: relative;
  padding: clamp(17px, 2.2vw, 22px) 46px clamp(17px, 2.2vw, 22px) 0;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.35;
  color: var(--paper);
  transition: color var(--t-fast) linear;
}

.page-contact .coop-faq__item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-contact .coop-faq__item[open] summary::after {
  content: "−";
}

.page-contact .coop-faq__item summary:hover {
  color: var(--lime);
}

.page-contact .coop-faq__item p {
  margin: 0 0 clamp(18px, 2.4vw, 24px);
  padding-left: 16px;
  border-left: 2px solid var(--indigo-2);
  max-width: 78ch;
  font-size: 14px;
  line-height: 1.76;
  color: var(--silver);
}

.page-contact .coop-faq__item a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-contact .coop-faq__item a:hover {
  color: var(--orange);
}

/* ============ 断点 ============ */
@media (min-width: 640px) {
  .page-contact .coop-dirs__band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .coop-rail__row {
    grid-template-columns: minmax(90px, 130px) minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }

  .page-contact .coop-rail__row dt {
    padding-top: 2px;
  }
}

@media (min-width: 960px) {
  .page-contact .coop-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-contact .coop-dirs__band {
    grid-template-columns: 1.2fr 1fr 1fr 1.12fr;
  }

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

  .page-contact .coop-rail {
    position: sticky;
    top: 108px;
  }
}

@media (min-width: 1200px) {
  .page-contact .coop-hero__lead {
    padding: 52px 50px;
  }

  .page-contact .coop-dir {
    padding: 34px 28px 38px;
  }
}