.page-contact {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-contact .co-crumbs {
  padding-top: clamp(16px, 3vw, 26px);
}
.page-contact .co-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}
.page-contact .co-crumbs li {
  display: flex;
  gap: 8px;
  color: var(--ink-mute);
}
.page-contact .co-crumbs li::after {
  content: "/";
  color: var(--grape-300);
}
.page-contact .co-crumbs li:last-child::after {
  content: "";
}
.page-contact .co-crumbs a {
  color: var(--ink-mute);
  text-decoration: none;
}
.page-contact .co-crumbs a:hover {
  color: var(--grape-500);
  text-decoration: underline;
}
.page-contact .co-crumbs a[aria-current="page"] {
  color: var(--grape-700);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 6vw, 76px);
}
.page-contact .co-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--grape-300), transparent 72%);
}
.page-contact .co-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}
.page-contact .co-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 82px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
}
.page-contact .co-hero__mark {
  background: linear-gradient(transparent 64%, var(--green-200) 64%);
}
.page-contact .co-hero__copy .lede {
  margin: 20px 0 0;
  max-width: 38ch;
  color: var(--ink-mute);
  font-size: clamp(16px, 2vw, 18px);
}
.page-contact .co-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .co-facts {
  padding: clamp(20px, 3vw, 30px);
  background:
    radial-gradient(130% 100% at 100% 0%, rgba(110, 53, 163, 0.6), transparent 62%),
    var(--night);
  color: var(--paper);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%
  );
}
.page-contact .co-facts__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold-500);
}
.page-contact .co-facts__list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-contact .co-facts__item {
  display: grid;
  gap: 2px;
  padding-bottom: 14px;
  border-bottom: 1px dashed rgba(169, 127, 212, 0.45);
}
.page-contact .co-facts__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-contact .co-facts__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.15;
}
.page-contact .co-facts__label {
  font-size: 13px;
  color: var(--grape-300);
}

/* ---------- 主栅格 ---------- */
.page-contact .co-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  padding-bottom: clamp(48px, 7vw, 96px);
}
.page-contact .co-main {
  min-width: 0;
}
.page-contact .co-rail {
  order: -1;
  display: grid;
  gap: 16px;
  align-content: start;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-contact .co-section {
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: 1px solid rgba(75, 31, 115, 0.12);
}
.page-contact .co-section:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-contact .co-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}
.page-contact .co-section__head .section-index {
  font-size: 13px;
  color: var(--grape-500);
  letter-spacing: 0.1em;
}
.page-contact .co-section__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.page-contact .co-section__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 40ch;
  color: var(--ink-mute);
}

.page-contact .co-figure {
  margin: 0 0 clamp(22px, 3vw, 32px);
}

/* ---------- 三类合作 ---------- */
.page-contact .co-types {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.2vw, 26px);
  align-items: start;
}
.page-contact .co-type {
  padding: clamp(20px, 2.4vw, 28px) clamp(18px, 2.2vw, 26px) clamp(22px, 2.6vw, 30px);
  background: var(--grape-050);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%
  );
}
.page-contact .co-type--b {
  background: transparent;
  border-left: 3px solid var(--green-600);
  clip-path: none;
}
.page-contact .co-type--c {
  background: var(--grape-900);
  color: var(--paper);
}
.page-contact .co-type__tag {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-500);
}
.page-contact .co-type--a .co-type__tag,
.page-contact .co-type--b .co-type__tag {
  color: var(--grape-500);
}
.page-contact .co-type__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.2;
}
.page-contact .co-type__scope {
  margin: 0 0 18px;
  font-size: 15.5px;
}
.page-contact .co-type--c .co-type__scope {
  color: var(--grape-300);
}
.page-contact .co-type__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
}
.page-contact .co-type--c .co-type__label {
  color: var(--grape-300);
}
.page-contact .co-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 15px;
}
.page-contact .co-list li {
  position: relative;
  padding-left: 18px;
}
.page-contact .co-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--green-600);
}
.page-contact .co-type--c .co-list li::before {
  background: var(--green-200);
}

/* ---------- 对接流程 ---------- */
.page-contact .co-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}
.page-contact .co-step {
  position: relative;
  padding: 20px 18px 24px;
  background: var(--paper);
  border: 1px solid rgba(75, 31, 115, 0.18);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 18px),
    calc(100% - 18px) 100%,
    0 100%
  );
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}
.page-contact .co-step:hover {
  background: var(--grape-050);
  transform: translateY(-2px);
}
.page-contact .co-step__num {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-500);
}
.page-contact .co-step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.25;
}
.page-contact .co-step p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-mute);
}

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  display: grid;
  gap: 10px;
}
.page-contact .co-faq__item {
  background: var(--grape-050);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 14px),
    calc(100% - 14px) 100%,
    0 100%
  );
}
.page-contact .co-faq__item[open] {
  background: var(--grape-050);
}
.page-contact .co-faq__item summary {
  position: relative;
  padding: 16px 48px 16px 18px;
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  list-style: none;
}
.page-contact .co-faq__item summary::-webkit-details-marker {
  display: none;
}
.page-contact .co-faq__item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--green-600);
}
.page-contact .co-faq__item[open] summary::after {
  content: "–";
}
.page-contact .co-faq__item summary:focus-visible {
  outline: 2px solid var(--green-600);
  outline-offset: 2px;
}
.page-contact .co-faq__body {
  padding: 0 18px 18px;
}
.page-contact .co-faq__body p {
  margin: 0;
  font-size: 15.5px;
  color: var(--ink);
}

/* ---------- 收尾 ---------- */
.page-contact .co-main__foot {
  margin: 20px 0 0;
  font-size: 15px;
  color: var(--ink-mute);
}
.page-contact .co-main__foot a {
  margin-left: 4px;
}

/* ---------- 粘性信息栏 ---------- */
.page-contact .co-rail__box {
  padding: clamp(18px, 2.4vw, 24px);
  background: var(--grape-050);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%
  );
}
.page-contact .co-rail__box--deep {
  background: var(--grape-900);
  color: var(--paper);
}
.page-contact .co-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.3;
}
.page-contact .co-rail__stats {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-contact .co-stat {
  display: grid;
  gap: 2px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(110, 53, 163, 0.32);
}
.page-contact .co-stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-contact .co-stat__num {
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  color: var(--grape-700);
}
.page-contact .co-stat__label {
  font-size: 13.5px;
  color: var(--ink-mute);
}
.page-contact .co-rail__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  color: var(--ink-mute);
}
.page-contact .co-rail__box--deep .co-rail__note {
  color: var(--grape-300);
}
.page-contact .co-rail__note a {
  color: var(--green-200);
}

.page-contact .co-line {
  padding: 12px 0;
  border-bottom: 1px dashed rgba(169, 127, 212, 0.4);
}
.page-contact .co-line:last-of-type {
  border-bottom: 0;
}
.page-contact .co-line__label {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--grape-300);
}
.page-contact .co-line__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
  text-decoration: none;
  word-break: break-word;
}
.page-contact a.co-line__value {
  border-bottom: 1px solid rgba(191, 233, 214, 0.5);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
.page-contact a.co-line__value:hover {
  color: var(--green-200);
  border-color: var(--green-200);
}
.page-contact a.co-line__value:focus-visible {
  outline: 2px solid var(--green-600);
  outline-offset: 3px;
}

.page-contact .co-links {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-contact .co-links__item {
  display: block;
  padding: 10px 12px;
  font-size: 14.5px;
  color: var(--grape-700);
  text-decoration: none;
  background: var(--paper);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 10px),
    calc(100% - 10px) 100%,
    0 100%
  );
  transition: background-color 180ms var(--ease), color 180ms var(--ease), transform 180ms var(--ease);
}
.page-contact .co-links__item:hover {
  background: var(--green-200);
  color: var(--ink);
  transform: translateY(-2px);
}
.page-contact .co-links__item:focus-visible {
  outline: 2px solid var(--green-600);
  outline-offset: 2px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-contact .co-types {
    grid-template-columns: 1.45fr 1.05fr 0.85fr;
  }
  .page-contact .co-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-contact .co-hero__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.7fr);
    align-items: end;
  }
}

@media (min-width: 1040px) {
  .page-contact .co-layout {
    grid-template-columns: minmax(0, 1.62fr) minmax(300px, 0.8fr);
    align-items: start;
  }
  .page-contact .co-rail {
    order: 0;
    position: sticky;
    top: calc(var(--h-mast) + var(--h-nav) + 20px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-step,
  .page-contact .co-links__item,
  .page-contact a.co-line__value {
    transition: none;
  }
  .page-contact .co-step:hover,
  .page-contact .co-links__item:hover {
    transform: none;
  }
}