/* ===== 商务合作页 · page-contact ===== */
.page-contact {
  --co-glow-line: rgba(198, 255, 0, 0.28);
  --co-gridline: rgba(138, 151, 166, 0.05);
  display: block;
  background-image: linear-gradient(to right, var(--co-gridline) 1px, transparent 1px);
  background-size: 72px 100%;
}

.page-contact .breadcrumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  padding: 28px 0 0;
}

.page-contact .co-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.4vw, 4.35rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--white);
  max-width: 16em;
}

.page-contact .co-hero__lead {
  margin: 22px 0 0;
  max-width: 44rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .co-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-contact .co-hero__media {
  margin: 42px 0 0;
  border: 1px solid var(--line);
}

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

/* ---------- 通用区块 ---------- */
.page-contact .co-section {
  padding: 76px 0 0;
}

.page-contact .co-section .section__head {
  max-width: 52rem;
}

/* ---------- 合作方向 ---------- */
.page-contact .co-dirs {
  display: grid;
  gap: 18px;
  margin-top: 38px;
}

.page-contact .co-dir {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px 22px 30px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: border-color 240ms var(--ease), transform 240ms var(--ease);
}

.page-contact .co-dir::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--cdir, var(--green));
}

.page-contact .co-dir--content { --cdir: var(--green); }
.page-contact .co-dir--data { --cdir: var(--blue); }
.page-contact .co-dir--brand { --cdir: var(--orange); }

.page-contact .co-dir:hover {
  border-color: var(--graphite);
  transform: translateY(-2px);
}

.page-contact .co-dir__tag {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cdir, var(--green));
}

.page-contact .co-dir__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.14rem;
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .co-dir__text {
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-contact .co-dir__list {
  list-style: none;
  margin: auto 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 9px;
}

.page-contact .co-dir__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .co-dir__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--cdir, var(--green));
}

.page-contact .co-dirs__media {
  margin: 22px 0 0;
  aspect-ratio: 880 / 520;
  max-height: 300px;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* ---------- 推进流程 + 联系卡片 ---------- */
.page-contact .co-flow {
  display: grid;
  gap: 34px;
  margin-top: 42px;
}

.page-contact .co-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 36px;
}

.page-contact .co-track::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--green), var(--blue) 48%, var(--line) 100%);
}

.page-contact .co-step {
  position: relative;
  padding-bottom: 36px;
}

.page-contact .co-step:last-child {
  padding-bottom: 0;
}

.page-contact .co-step::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 5px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--graphite);
  transition: border-color 240ms var(--ease), background-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-contact .co-step:hover::before {
  border-color: var(--blue);
}

.page-contact .co-step--active::before {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 0 5px var(--green-glow);
}

.page-contact .co-step__num {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-contact .co-step__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.28rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .co-step__text {
  margin: 10px 0 0;
  max-width: 44rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .co-step__more {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-contact .co-step__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--blue);
}

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

.page-contact .co-step__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1;
  color: var(--blue);
}

.page-contact .co-step__more[open] summary::before {
  content: "–";
}

.page-contact .co-step__more p {
  margin: 10px 0 0;
  max-width: 40rem;
  font-size: 0.87rem;
  line-height: 1.8;
  color: var(--muted);
}

/* 联系卡片：切角 + 荧光描边 */
.page-contact .co-card {
  padding: 1px;
  background: linear-gradient(155deg, rgba(198, 255, 0, 0.55), rgba(26, 32, 41, 0.9) 34%, rgba(26, 32, 41, 0.9) 62%, rgba(0, 229, 255, 0.5));
  clip-path: polygon(22px 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%, 0 22px);
}

.page-contact .co-card__inner {
  padding: 28px 22px 30px;
  background: var(--ink-2);
  clip-path: polygon(21px 0, 100% 0, 100% calc(100% - 21px), calc(100% - 21px) 100%, 0 100%, 0 21px);
}

.page-contact .co-card__index {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--green);
}

.page-contact .co-card__title {
  margin: 10px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.32rem;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .co-lines {
  margin: 0;
  display: grid;
}

.page-contact .co-line {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
}

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

.page-contact .co-line dt {
  padding-top: 3px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-contact .co-line dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.68;
  color: var(--white);
  word-break: break-word;
}

.page-contact .co-card__note {
  margin: 18px 0 0;
  font-size: 0.84rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 材料清单 ---------- */
.page-contact .co-mats {
  margin-top: 36px;
  display: grid;
  border-top: 1px solid var(--line);
}

.page-contact .co-mat {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .co-mat__num {
  margin: 0;
  padding-top: 4px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-contact .co-mat__title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-contact .co-mat__text {
  grid-column: 2;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 订阅与数据 ---------- */
.page-contact .co-help {
  display: grid;
  gap: 28px;
  margin-top: 36px;
  padding: 30px 24px 32px;
  background: var(--teal);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
}

.page-contact .co-help__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 20em;
}

.page-contact .co-help__text {
  margin: 16px 0 0;
  max-width: 42rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .co-help__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .co-help__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--white);
}

.page-contact .co-help__list .mono {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-contact .co-help__note {
  margin: 20px 0 0;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .co-help__note a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
}

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

/* ---------- 收尾行动 ---------- */
.page-contact .co-final {
  margin-top: 88px;
  padding: 92px 0 124px;
  border-top: 1px solid var(--line);
  background: repeating-linear-gradient(45deg, rgba(198, 255, 0, 0.032) 0 1px, transparent 1px 28px);
}

.page-contact .co-final__eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--green);
}

.page-contact .co-final__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.4vw, 2.85rem);
  line-height: 1.14;
  letter-spacing: -0.025em;
  color: var(--white);
  max-width: 22em;
}

.page-contact .co-final__text {
  margin: 18px 0 0;
  max-width: 38rem;
  font-size: 0.97rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-contact .co-final__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 34px;
}

.page-contact .co-copy {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 14px 20px;
  font: inherit;
  text-align: left;
  cursor: pointer;
  color: var(--white);
  background: var(--green-glow);
  border: 1px solid var(--co-glow-line);
  transition: background-color 240ms var(--ease), border-color 240ms var(--ease);
}

.page-contact .co-copy:hover {
  background: rgba(198, 255, 0, 0.2);
  border-color: var(--green);
}

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

.page-contact .co-copy__addr {
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  color: var(--green);
}

.page-contact .co-copy__tag {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-contact .co-copy {
    flex-direction: row;
    align-items: center;
    gap: 14px;
  }

  .page-contact .co-copy__tag {
    padding-left: 14px;
    border-left: 1px solid var(--line);
  }
}

@media (min-width: 760px) {
  .page-contact .co-mats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 52px;
  }
}

@media (min-width: 900px) {
  .page-contact .co-dirs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .co-help {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.7fr);
    align-items: center;
    gap: 46px;
    padding: 40px;
  }
}

@media (min-width: 1000px) {
  .page-contact .co-flow {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.86fr);
    gap: 56px;
    align-items: start;
  }

  .page-contact .co-side {
    position: sticky;
    top: calc(var(--ticker-h) + 24px);
  }
}

@media (min-width: 1200px) {
  .page-contact .co-hero {
    padding-top: 40px;
  }

  .page-contact .co-section {
    padding-top: 96px;
  }

  .page-contact .co-final {
    padding: 112px 0 150px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-dir,
  .page-contact .co-step::before,
  .page-contact .co-copy {
    transition: none;
  }

  .page-contact .co-dir:hover {
    transform: none;
  }
}