.page-contact {
  --co-flagline: linear-gradient(90deg, var(--blue) 0 20%, var(--white) 20% 40%, var(--red) 40% 60%, var(--green) 60% 80%, var(--gold) 80% 100%);
  --co-card-accent: var(--gold);
  display: block;
  padding-bottom: clamp(56px, 9vw, 112px);
}

/* 首屏 */
.page-contact .co-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(440px, 76vh, 660px);
  margin-top: 20px;
  overflow: hidden;
  background: var(--night);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-contact .co-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-contact .co-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-contact .co-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(115% 80% at 78% 0%, rgba(42, 75, 124, 0.86), transparent 62%),
    linear-gradient(180deg, rgba(10, 20, 40, 0.42) 0%, rgba(10, 20, 40, 0.86) 58%, var(--night) 100%);
}

.page-contact .co-hero__body {
  position: relative;
  z-index: 1;
  width: 100%;
  padding-top: clamp(64px, 16vw, 148px);
  padding-bottom: clamp(32px, 6vw, 64px);
}

.page-contact .co-hero h1 {
  margin: 14px 0 0;
  max-width: 17ch;
  font-size: clamp(30px, 5.4vw, 58px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-contact .co-hero__lead {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--white);
  opacity: 0.86;
}

.page-contact .co-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 36px);
}

.page-contact .co-hero__actions .btn {
  text-decoration: none;
}

/* 通用小标题组 */
.page-contact .co-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-contact .co-head h2 {
  margin: 0;
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .co-head__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* 合作对象 */
.page-contact .co-types {
  padding-top: clamp(52px, 8vw, 100px);
}

.page-contact .co-types__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 3vw, 26px);
  align-items: start;
}

.page-contact .co-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  padding: clamp(20px, 3vw, 30px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--co-card-accent);
  border-radius: var(--radius);
}

.page-contact .co-card:nth-child(1) { --co-card-accent: var(--gold); }
.page-contact .co-card:nth-child(2) { --co-card-accent: var(--green); }
.page-contact .co-card:nth-child(3) { --co-card-accent: var(--red); }

.page-contact .co-card__tag {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--co-card-accent);
}

.page-contact .co-card h3 {
  margin: 0;
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--white);
}

.page-contact .co-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-contact .co-card__more summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: var(--gold);
}

.page-contact .co-card__more summary::-webkit-details-marker { display: none; }

.page-contact .co-card__more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  transition: transform 0.24s var(--ease);
}

.page-contact .co-card__more[open] summary::after { transform: rotate(45deg); }

.page-contact .co-card__more summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-contact .co-card__list {
  margin: 14px 0 0;
  padding-left: 1.1em;
  display: grid;
  gap: 9px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .co-card__list li::marker { color: var(--blue); }

/* 合作形式 */
.page-contact .co-gains {
  margin-top: clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(80% 120% at 0% 0%, rgba(42, 75, 124, 0.5), transparent 62%),
    linear-gradient(180deg, rgba(19, 36, 67, 0.92), rgba(10, 20, 40, 0.55));
}

.page-contact .co-gains__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 58px) var(--gutter);
}

.page-contact .co-gains__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 38px);
}

.page-contact .co-gain {
  min-width: 0;
}

.page-contact .co-gain::before {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-bottom: 12px;
  border-radius: 2px;
  background: var(--co-flagline);
}

.page-contact .co-gain__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-contact .co-gain h3 {
  margin: 8px 0 0;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-contact .co-gain p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

/* 对接流程 */
.page-contact .co-flow {
  padding-top: clamp(52px, 8vw, 96px);
}

.page-contact .co-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 32px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .co-steps__item {
  position: relative;
  min-width: 0;
}

.page-contact .co-steps__dot {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--line);
  font-size: 19px;
  color: var(--gold);
  transition: border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-contact .co-steps__item:hover .co-steps__dot,
.page-contact .co-steps__item:focus-within .co-steps__dot {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(245, 194, 74, 0.14);
}

.page-contact .co-steps__item h3 {
  margin: 16px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-contact .co-steps__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .co-steps__time {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-contact .co-flow__figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

.page-contact .co-flow__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-contact .co-flow__figure figcaption {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 联络信息 */
.page-contact .co-contact {
  position: relative;
  margin-top: clamp(52px, 8vw, 96px);
  padding: clamp(18px, 3.4vw, 40px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(95% 130% at 12% 0%, rgba(42, 75, 124, 0.92), transparent 60%),
    radial-gradient(70% 100% at 100% 100%, rgba(245, 194, 74, 0.16), transparent 68%),
    var(--night);
}

.page-contact .co-contact__card {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(20px, 3.4vw, 38px);
  border: 1px solid rgba(243, 246, 251, 0.16);
  border-radius: calc(var(--radius) - 2px);
  background: rgba(31, 55, 96, 0.62);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-contact .co-contact h2 {
  margin: 12px 0 0;
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .co-contact__note {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .co-contact__list {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-contact .co-contact__row {
  display: grid;
  gap: 6px;
  padding-block: 14px;
  border-top: 1px solid rgba(243, 246, 251, 0.14);
}

.page-contact .co-contact__row:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .co-contact__key {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-contact .co-contact__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.9vw, 19px);
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-contact .co-contact__aside {
  padding-top: clamp(18px, 3vw, 24px);
  border-top: 1px solid rgba(243, 246, 251, 0.14);
}

.page-contact .co-contact__aside h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--gold);
}

.page-contact .co-contact__aside p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--white);
  opacity: 0.86;
}

.page-contact .co-contact__aside .btn {
  margin-top: 18px;
  text-decoration: none;
}

.page-contact .co-contact__aside-fine {
  font-size: 13.5px;
  color: var(--muted) !important;
  opacity: 1 !important;
}

.page-contact .co-contact__aside-fine a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(91, 141, 239, 0.4);
}

.page-contact .co-contact__aside-fine a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 常见问题 */
.page-contact .co-faq {
  padding-top: clamp(52px, 8vw, 96px);
}

.page-contact .co-faq__item {
  padding-block: 16px;
  border-top: 1px solid var(--line);
}

.page-contact .co-faq__item:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-contact .co-faq__item summary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15.5px, 1.7vw, 17px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--white);
}

.page-contact .co-faq__item summary::-webkit-details-marker { display: none; }

.page-contact .co-faq__item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--gold);
  transition: transform 0.24s var(--ease);
}

.page-contact .co-faq__item[open] summary::after { transform: rotate(45deg); }

.page-contact .co-faq__item summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-contact .co-faq__item p {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .co-faq__more {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .co-faq__more a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 194, 74, 0.45);
}

.page-contact .co-faq__more a:hover {
  border-bottom-color: var(--gold);
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-contact .co-gains__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-contact .co-contact__card {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-contact .co-contact__aside {
    padding-top: 0;
    padding-left: clamp(18px, 2.6vw, 30px);
    border-top: 0;
    border-left: 1px solid rgba(243, 246, 251, 0.14);
  }
}

@media (min-width: 900px) {
  .page-contact .co-types__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-contact .co-card:nth-child(2) {
    margin-top: 44px;
  }

  .page-contact .co-card:nth-child(3) {
    margin-top: 18px;
  }

  .page-contact .co-card--tall {
    padding-bottom: clamp(26px, 3.4vw, 38px);
  }
}

@media (min-width: 880px) {
  .page-contact .co-steps {
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(18px, 2.4vw, 26px);
  }

  .page-contact .co-steps__item:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 26px;
    left: 66px;
    right: -14px;
    height: 2px;
    background: linear-gradient(90deg, var(--gold), var(--red) 42%, var(--green) 72%, rgba(91, 141, 239, 0.15));
    opacity: 0.75;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-card__more summary::after,
  .page-contact .co-faq__item summary::after,
  .page-contact .co-steps__dot {
    transition: none;
  }
}