.page-contact {
  --pc-pad-y: clamp(52px, 7.5vw, 96px);
  --pc-c1: var(--c-cyan);
  --pc-c2: var(--c-violet);
  --pc-c3: var(--c-amber);
  display: block;
}

/* ---------- 首屏 ---------- */

.page-contact .coop-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--shell-h) + 34px) 0 0;
  background:
    radial-gradient(118% 82% at 6% -14%, rgba(43, 227, 224, 0.16), transparent 60%),
    radial-gradient(102% 78% at 94% 2%, rgba(123, 92, 255, 0.19), transparent 62%),
    var(--c-void);
}

.page-contact .coop-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: 0;
  width: 68%;
  height: 200px;
  background: linear-gradient(
    94deg,
    transparent 0 26%,
    rgba(123, 92, 255, 0.15) 26% 52%,
    rgba(43, 227, 224, 0.11) 52% 68%,
    transparent 68%
  );
  transform: skewY(-6deg);
  transform-origin: right bottom;
  pointer-events: none;
}

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

.page-contact .coop-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(32px, 7.2vw, 60px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--c-text);
  max-width: 17ch;
}

.page-contact .coop-hero__lede {
  margin-top: 20px;
  max-width: 60ch;
}

/* 合作方向入口带 */

.page-contact .coop-rail {
  list-style: none;
  margin: 38px 0 0;
  padding: 0 0 62px;
  display: grid;
  gap: 14px;
}

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

.page-contact .coop-rail__link {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(19, 26, 51, 0.7), rgba(11, 16, 32, 0.42));
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease),
    background var(--t-base) var(--ease);
}

.page-contact .coop-rail__link:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-contact .coop-rail__dot {
  width: 11px;
  height: 11px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--pc-c1);
  box-shadow: 0 0 0 4px rgba(43, 227, 224, 0.16);
  transition: box-shadow var(--t-fast) var(--ease);
}

.page-contact .coop-rail__item--b .coop-rail__dot {
  background: var(--pc-c2);
  box-shadow: 0 0 0 4px rgba(123, 92, 255, 0.18);
}

.page-contact .coop-rail__item--c .coop-rail__dot {
  background: var(--pc-c3);
  box-shadow: 0 0 0 4px rgba(255, 178, 77, 0.18);
}

.page-contact .coop-rail__text {
  display: block;
  min-width: 0;
}

.page-contact .coop-rail__name {
  display: block;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.page-contact .coop-rail__desc {
  display: block;
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mute);
}

@media (min-width: 820px) {
  .page-contact .coop-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin-top: 52px;
    padding-bottom: 78px;
    position: relative;
  }

  .page-contact .coop-rail::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--pc-c1), var(--pc-c2), var(--pc-c3));
    opacity: 0.55;
  }

  .page-contact .coop-rail__link {
    border: 0;
    border-right: 1px solid var(--c-line);
    border-radius: 0;
    background: none;
    padding: 26px 26px 0 0;
    min-height: 100%;
  }

  .page-contact .coop-rail__item:last-child .coop-rail__link {
    border-right: 0;
    padding-right: 0;
  }

  .page-contact .coop-rail__item--a .coop-rail__link:hover,
  .page-contact .coop-rail__item--b .coop-rail__link:hover,
  .page-contact .coop-rail__item--c .coop-rail__link:hover {
    background: linear-gradient(180deg, rgba(19, 26, 51, 0.5), rgba(5, 7, 14, 0));
  }

  .page-contact .coop-rail__link:hover .coop-rail__name,
  .page-contact .coop-rail__link:focus-visible .coop-rail__name {
    color: var(--pc-c1);
  }

  .page-contact .coop-rail__item--b .coop-rail__link:hover .coop-rail__name,
  .page-contact .coop-rail__item--b .coop-rail__link:focus-visible .coop-rail__name {
    color: var(--pc-c2);
  }

  .page-contact .coop-rail__item--c .coop-rail__link:hover .coop-rail__name,
  .page-contact .coop-rail__item--c .coop-rail__link:focus-visible .coop-rail__name {
    color: var(--pc-c3);
  }

  .page-contact .coop-rail__link:hover .coop-rail__dot,
  .page-contact .coop-rail__link:focus-visible .coop-rail__dot {
    box-shadow: 0 0 0 7px rgba(43, 227, 224, 0.14);
  }
}

/* ---------- 三类合作 ---------- */

.page-contact .coop-types__grid {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.page-contact .coop-type {
  position: relative;
  min-width: 0;
  padding: 30px 22px 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l);
  background: linear-gradient(168deg, rgba(19, 26, 51, 0.86), rgba(11, 16, 32, 0.65));
  overflow: hidden;
  transition: border-color var(--t-base) var(--ease);
}

.page-contact .coop-type::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--pc-c1), transparent 88%);
}

.page-contact .coop-type--channel::before {
  background: linear-gradient(90deg, var(--pc-c2), transparent 88%);
}

.page-contact .coop-type--tech::before {
  background: linear-gradient(90deg, var(--pc-c3), transparent 88%);
}

.page-contact .coop-type::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -50px;
  width: 170px;
  height: 170px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(43, 227, 224, 0.13), transparent 68%);
  pointer-events: none;
}

.page-contact .coop-type--channel::after {
  background: radial-gradient(circle, rgba(123, 92, 255, 0.15), transparent 68%);
}

.page-contact .coop-type--tech::after {
  background: radial-gradient(circle, rgba(255, 178, 77, 0.14), transparent 68%);
}

.page-contact .coop-type:hover {
  border-color: var(--pc-c1);
}

.page-contact .coop-type--channel:hover {
  border-color: var(--pc-c2);
}

.page-contact .coop-type--tech:hover {
  border-color: var(--pc-c3);
}

.page-contact .coop-type__index {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.page-contact .coop-type__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 3.6vw, 23px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.page-contact .coop-type__who {
  margin: 12px 0 0;
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--pc-c3);
}

.page-contact .coop-type--channel .coop-type__who {
  color: var(--pc-c2);
}

.page-contact .coop-type--content .coop-type__who {
  color: var(--pc-c1);
}

.page-contact .coop-type__body {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-body);
}

.page-contact .coop-type__meta {
  list-style: none;
  margin: 20px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--c-line);
  display: grid;
  gap: 8px;
}

.page-contact .coop-type__meta li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mute);
}

.page-contact .coop-type__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--pc-c1);
}

.page-contact .coop-type--channel .coop-type__meta li::before {
  background: var(--pc-c2);
}

.page-contact .coop-type--tech .coop-type__meta li::before {
  background: var(--pc-c3);
}

.page-contact .coop-types__foot {
  margin: 34px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--c-line);
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-mute);
}

@media (min-width: 900px) {
  .page-contact .coop-types__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: 44px;
  }

  .page-contact .coop-type:nth-child(2) {
    transform: translateY(18px);
  }
}

/* ---------- 对接流程 ---------- */

.page-contact .coop-flow__figure {
  margin: 36px 0 0;
}

.page-contact .flow-steps {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .flow-step {
  position: relative;
  min-width: 0;
  padding: 22px 20px 20px 24px;
  border-left: 2px solid var(--pc-c1);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: linear-gradient(90deg, rgba(19, 26, 51, 0.6), rgba(11, 16, 32, 0.18));
}

.page-contact .flow-step:nth-child(2) {
  border-left-color: var(--pc-c2);
}

.page-contact .flow-step:nth-child(3) {
  border-left-color: var(--pc-c3);
}

.page-contact .flow-step:nth-child(4) {
  border-left-color: var(--c-green);
}

.page-contact .flow-step__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-mute);
}

.page-contact .flow-step__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.page-contact .flow-step__desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-body);
}

.page-contact .flow-step__out {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mute);
}

.page-contact .flow-step__outlabel {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-contact .flow-step:hover .flow-step__outlabel {
  border-color: var(--c-violet);
  color: var(--c-violet);
}

@media (min-width: 900px) {
  .page-contact .flow-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    margin-top: 46px;
  }

  .page-contact .flow-step {
    padding: 26px 24px 26px 0;
    border-left: 0;
    border-top: 2px solid var(--pc-c1);
    border-radius: 0;
    background: none;
    display: flex;
    flex-direction: column;
  }

  .page-contact .flow-step:nth-child(2) {
    border-top-color: var(--pc-c2);
    padding-left: 24px;
  }

  .page-contact .flow-step:nth-child(3) {
    border-top-color: var(--pc-c3);
    padding-left: 24px;
  }

  .page-contact .flow-step:nth-child(4) {
    border-top-color: var(--c-green);
    padding-left: 24px;
  }

  .page-contact .flow-step__out {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--c-line);
  }
}

/* ---------- 准备材料 ---------- */

.page-contact .prep-list {
  margin: 36px 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-contact .prep-item {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--c-line);
  transition: border-color var(--t-base) var(--ease);
}

.page-contact .prep-item:hover {
  border-bottom-color: var(--c-cyan);
}

.page-contact .prep-item__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.page-contact .prep-item__use {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-body);
}

@media (min-width: 780px) {
  .page-contact .prep-item {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 40px;
    align-items: baseline;
    padding: 24px 0;
  }

  .page-contact .prep-item__name {
    position: relative;
    padding-left: 20px;
  }

  .page-contact .prep-item__name::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 8px;
    height: 2px;
    background: var(--c-cyan);
  }
}

/* ---------- 常见问题 ---------- */

.page-contact .faq-list {
  margin-top: 32px;
  border-top: 1px solid var(--c-line);
}

.page-contact .faq-item {
  border-bottom: 1px solid var(--c-line);
}

.page-contact .faq-item__q {
  position: relative;
  padding: 20px 40px 20px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--c-text);
  transition: color var(--t-fast) var(--ease);
}

.page-contact .faq-item__q::-webkit-details-marker {
  display: none;
}

.page-contact .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 19px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--c-cyan);
  transition: color var(--t-fast) var(--ease);
}

.page-contact .faq-item[open] .faq-item__q::after {
  content: "\2212";
  color: var(--c-violet);
}

.page-contact .faq-item__q:hover,
.page-contact .faq-item__q:focus-visible {
  color: var(--c-cyan);
}

.page-contact .faq-item__a {
  margin: 0;
  padding: 0 0 24px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-body);
}

/* ---------- 用户支持 ---------- */

.page-contact .coop-support__grid {
  display: grid;
  gap: 34px;
}

.page-contact .support-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-contact .support-item {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-contact .support-item__label {
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.page-contact .support-item__field {
  min-width: 0;
}

.page-contact .support-item__value {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  word-break: break-word;
}

.page-contact .support-item__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mute);
}

.page-contact .coop-support__tip {
  margin: 24px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--c-amber);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(255, 178, 77, 0.07);
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-body);
}

.page-contact .coop-support__more {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--c-mute);
}

.page-contact .coop-support__figure {
  margin: 0;
}

@media (min-width: 960px) {
  .page-contact .coop-support__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 52px;
    align-items: start;
  }

  .page-contact .coop-support__figure {
    position: sticky;
    top: calc(var(--shell-h) + 24px);
  }
}

/* ---------- 窄屏兜底 ---------- */

@media (max-width: 420px) {
  .page-contact .coop-hero__title {
    font-size: 30px;
  }

  .page-contact .coop-rail__link {
    padding: 16px 15px;
  }

  .page-contact .coop-type {
    padding: 26px 17px 22px;
  }

  .page-contact .flow-step {
    padding: 18px 16px 18px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .coop-rail__link,
  .page-contact .coop-type,
  .page-contact .prep-item,
  .page-contact .faq-item__q,
  .page-contact .flow-step__outlabel {
    transition: none;
  }
}