.page-contact {
  --coop-pad: clamp(20px, 2.4vw, 32px);
  --coop-line: var(--ink-2);
  --coop-glow: rgba(53, 242, 227, 0.16);
}

/* ===== 首屏 ===== */
.page-contact .coop-hero {
  position: relative;
  padding-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(8px, 2vw, 16px);
}

.page-contact .coop-hero::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -12%;
  width: min(680px, 72%);
  height: 520px;
  background: radial-gradient(ellipse at center, var(--coop-glow), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.page-contact .coop-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-contact .coop-hero__lead .eyebrow {
  margin: 0 0 14px;
}

.page-contact .coop-hero__lead h1 {
  margin: 0;
  line-height: 1.16;
  overflow-wrap: anywhere;
}

.page-contact .coop-hero__lead .lede {
  margin: clamp(16px, 2vw, 22px) 0 0;
  max-width: 32em;
}

/* ===== 图片容器 ===== */
.page-contact .coop-figure {
  position: relative;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  background: var(--ink-1);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-lg)), calc(100% - var(--cut-lg)) 100%, 0 100%);
  overflow: hidden;
}

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

.page-contact .coop-figure figcaption {
  padding: 11px 16px 13px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--fog);
  border-top: 1px solid var(--coop-line);
}

/* ===== 悬浮联系卡 ===== */
.page-contact .coop-desk {
  position: relative;
  padding: var(--coop-pad);
  background: linear-gradient(158deg, rgba(10, 27, 61, 0.97), rgba(13, 35, 80, 0.92));
  border-left: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-contact .coop-desk__kicker {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-contact .coop-desk__title {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.32;
  color: var(--white);
}

.page-contact .coop-desk__text {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fog);
}

.page-contact .coop-desk__list {
  margin: 0 0 22px;
  display: grid;
  gap: 0;
}

.page-contact .coop-desk__row {
  display: grid;
  grid-template-columns: 5.5em minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-top: 1px solid var(--coop-line);
}

.page-contact .coop-desk__row dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-contact .coop-desk__row dd {
  margin: 0;
  font-size: 15px;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-contact .coop-desk__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ===== 章节标题组 ===== */
.page-contact .coop-head {
  max-width: 46em;
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

.page-contact .coop-head__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
}

.page-contact .coop-head__note .btn,
.page-contact .coop-flow__aside .btn,
.page-contact .coop-response__more .btn {
  margin-left: 6px;
  padding-inline: 0;
}

/* ===== 合作方向 ===== */
.page-contact .coop-dirs {
  position: relative;
}

.page-contact .coop-dirs__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-contact .coop-dir {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--ink-1);
  border-top: 2px solid var(--coop-line);
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-contact .coop-dir:nth-child(1) { border-top-color: var(--cyan); }
.page-contact .coop-dir:nth-child(2) { border-top-color: var(--violet); }
.page-contact .coop-dir:nth-child(3) { border-top-color: var(--orange); }
.page-contact .coop-dir:nth-child(4) { border-top-color: var(--green); }

.page-contact .coop-dir:hover {
  transform: translateY(-4px);
}

.page-contact .coop-dir__idx {
  display: block;
  margin-bottom: 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--fog);
}

.page-contact .coop-dir h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--white);
}

.page-contact .coop-dir p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fog);
}

.page-contact .coop-dir .coop-dir__fit {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* ===== 合作流程 ===== */
.page-contact .coop-flow {
  background: linear-gradient(180deg, rgba(5, 13, 31, 0) 0%, rgba(23, 52, 95, 0.3) 46%, rgba(5, 13, 31, 0) 100%);
}

.page-contact .coop-steps {
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
  border-left: 1px solid var(--coop-line);
}

.page-contact .coop-step {
  position: relative;
  padding: 22px 0 24px 26px;
}

.page-contact .coop-step + .coop-step {
  border-top: 1px solid var(--coop-line);
}

.page-contact .coop-step::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 29px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-contact .coop-step__num {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-contact .coop-step h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--white);
}

.page-contact .coop-step p {
  margin: 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--fog);
}

.page-contact .coop-step .coop-step__meta {
  margin-top: 10px;
  font-size: 13px;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-contact .coop-flow__aside {
  margin: clamp(24px, 3vw, 34px) 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fog);
}

/* ===== 联系渠道 ===== */
.page-contact .coop-channels__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

.page-contact .coop-channels__list {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-contact .coop-channel {
  padding: 18px 20px 20px;
  background: var(--ink-1);
  border-left: 2px solid var(--coop-line);
  transition: border-color var(--t) var(--ease);
}

.page-contact .coop-channel:hover {
  border-left-color: var(--cyan);
}

.page-contact .coop-channel h3 {
  margin: 0;
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-contact .coop-channel__value {
  margin: 8px 0 8px;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.5;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-contact .coop-channel p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--fog);
}

.page-contact .coop-figure--channels {
  margin-top: 0;
}

/* ===== 合作准备清单 ===== */
.page-contact .coop-picker {
  position: relative;
}

.page-contact .coop-picker__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-contact .coop-picker__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-contact .coop-tab {
  display: inline-block;
  padding: 9px 16px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--fog);
  background: transparent;
  border: 1px solid var(--coop-line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-contact .coop-tab:hover {
  color: var(--white);
  border-color: var(--cyan);
}

.page-contact #coop-type-data:checked ~ .coop-picker__tabs [for="coop-type-data"],
.page-contact #coop-type-content:checked ~ .coop-picker__tabs [for="coop-type-content"],
.page-contact #coop-type-brand:checked ~ .coop-picker__tabs [for="coop-type-brand"],
.page-contact #coop-type-tech:checked ~ .coop-picker__tabs [for="coop-type-tech"] {
  color: var(--ink-0);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-contact #coop-type-data:focus-visible ~ .coop-picker__tabs [for="coop-type-data"],
.page-contact #coop-type-content:focus-visible ~ .coop-picker__tabs [for="coop-type-content"],
.page-contact #coop-type-brand:focus-visible ~ .coop-picker__tabs [for="coop-type-brand"],
.page-contact #coop-type-tech:focus-visible ~ .coop-picker__tabs [for="coop-type-tech"] {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-contact .coop-prep {
  display: none;
  padding: var(--coop-pad);
  background: var(--ink-1);
  border-top: 2px solid var(--cyan);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-contact #coop-type-data:checked ~ .coop-picker__panels [data-panel="data"],
.page-contact #coop-type-content:checked ~ .coop-picker__panels [data-panel="content"],
.page-contact #coop-type-brand:checked ~ .coop-picker__panels [data-panel="brand"],
.page-contact #coop-type-tech:checked ~ .coop-picker__panels [data-panel="tech"] {
  display: block;
}

.page-contact .coop-prep h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.45;
  color: var(--white);
}

.page-contact .coop-prep__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-contact .coop-prep__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--fog);
}

.page-contact .coop-prep__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 8px;
  height: 8px;
  background: var(--green);
  transform: rotate(45deg);
}

/* ===== 响应时效条 ===== */
.page-contact .coop-response {
  position: relative;
  margin-top: clamp(48px, 6vw, 84px);
  background: var(--ink-1);
}

.page-contact .coop-response::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 58%, var(--orange));
}

.page-contact .coop-response__inner {
  display: grid;
  gap: 6px;
  padding-top: clamp(18px, 2.6vw, 26px);
  padding-bottom: clamp(18px, 2.6vw, 26px);
  outline-offset: -4px;
}

.page-contact .coop-response__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
}

.page-contact .coop-response__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-contact .coop-response__lead {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--white);
  letter-spacing: 0.02em;
}

.page-contact .coop-response__more {
  max-height: 0;
  overflow: hidden;
  transition: max-height 420ms var(--ease);
}

.page-contact .coop-response__more p {
  margin: 0;
  padding-top: 10px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--fog);
}

.page-contact .coop-response:hover .coop-response__more,
.page-contact .coop-response:focus-within .coop-response__more {
  max-height: 220px;
}

/* ===== 平板 ===== */
@media (min-width: 720px) {
  .page-contact .coop-dirs__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-contact .coop-response {
    margin-top: clamp(56px, 7vw, 96px);
  }

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

/* ===== 桌面 ===== */
@media (min-width: 960px) {
  .page-contact .coop-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(36px, 4vw, 60px);
  }

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

  .page-contact .coop-channels__list {
    gap: 14px;
  }

  .page-contact .coop-steps {
    max-width: 62em;
  }

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

@media (min-width: 1100px) {
  .page-contact .coop-dirs__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-contact .coop-dir {
    padding: 24px 22px 26px;
  }
}

/* ===== 动效降级 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-contact .coop-dir,
  .page-contact .coop-tab,
  .page-contact .coop-channel,
  .page-contact .coop-response__more {
    transition: none;
  }

  .page-contact .coop-dir:hover {
    transform: none;
  }
}
<<<END>>>