/* ================= 商务合作 /cooperation/ ================= */
.page-contact {
  --pc-radius: 24px;
  --pc-gap: clamp(32px, 5vw, 64px);
  background: var(--ink-900);
  color: var(--silver-200);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-contact .pc-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--top-offset) + clamp(40px, 7vw, 92px)) 0 clamp(48px, 6vw, 84px);
  background: var(--ink-900);
}

.page-contact .pc-hero-shape {
  position: absolute;
  inset: 0 0 0 auto;
  width: min(1020px, 90%);
  background: linear-gradient(205deg, var(--ink-800) 0%, var(--ink-900) 76%);
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 86%);
  z-index: -1;
  pointer-events: none;
}

.page-contact .pc-hero-shape::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ink-500) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-500) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.3;
  -webkit-mask-image: linear-gradient(205deg, rgba(0, 0, 0, 0.85), transparent 72%);
  mask-image: linear-gradient(205deg, rgba(0, 0, 0, 0.85), transparent 72%);
}

.page-contact .pc-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-contact .pc-hero-title {
  margin: 12px 0 0;
  max-width: 13em;
  font-size: var(--fs-display);
  font-weight: 300;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-contact .pc-hero-lede {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 46em;
  color: var(--silver-200);
}

.page-contact .pc-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-contact .pc-hero-actions .btn-ghost {
  color: var(--silver-200);
  border-color: var(--ink-500);
}

.page-contact .pc-hero-actions .btn-ghost:hover,
.page-contact .pc-hero-actions .btn-ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-contact .pc-hero-meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 40px;
  margin: clamp(34px, 5vw, 52px) 0 0;
  padding: clamp(20px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--ink-500);
  font-size: 0.9rem;
  color: var(--silver-500);
}

.page-contact .pc-meta-num {
  margin-right: 8px;
  font-size: 1.05rem;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-contact .pc-hero-sentinel {
  display: block;
  height: 1px;
  margin-top: -1px;
}

/* ---------- 五步流程 ---------- */
.page-contact .pc-path {
  position: relative;
  overflow: hidden;
  padding: var(--section-y) 0;
  background: var(--ink-800);
}

.page-contact .pc-path-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
  z-index: 0;
}

.page-contact .pc-path .container {
  position: relative;
  z-index: 1;
}

.page-contact .pc-path-lede {
  max-width: 40em;
  color: var(--silver-500);
}

.page-contact .pc-steps {
  list-style: none;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-contact .pc-step {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  gap: 4px 18px;
  align-items: start;
  padding: 0 0 0 4px;
  border-left: 1px solid var(--ink-500);
}

.page-contact .pc-step-no {
  grid-row: 1 / span 2;
  align-self: start;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--ink-500);
  background: var(--ink-700);
  color: var(--cyan);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  transition: border-color 240ms ease, background-color 240ms ease;
}

.page-contact .pc-step-title {
  margin: 6px 0 0;
  font-size: 1.12rem;
  font-weight: 500;
  color: var(--paper);
}

.page-contact .pc-step-body {
  margin: 6px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver-500);
}

.page-contact .pc-step:hover .pc-step-no,
.page-contact .pc-step:focus-within .pc-step-no {
  border-color: var(--cyan);
  background: var(--mist);
}

.page-contact .pc-step:hover .pc-step-body,
.page-contact .pc-step:focus-within .pc-step-body {
  color: var(--silver-200);
}

.page-contact .pc-path-foot {
  margin: clamp(34px, 5vw, 52px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--ink-500);
  font-size: 0.9rem;
  color: var(--silver-500);
}

/* ---------- 四类合作情况 ---------- */
.page-contact .pc-cases {
  padding: var(--section-y) 0;
  background: var(--ink-900);
}

.page-contact .pc-case-list {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  border-bottom: 1px solid var(--ink-500);
}

.page-contact .pc-case {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: clamp(24px, 3vw, 36px) 0;
  border-top: 1px solid var(--ink-500);
  transition: background-color 240ms ease, padding-inline 240ms ease;
}

.page-contact .pc-case-no {
  display: inline-block;
  margin-bottom: 8px;
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-contact .pc-case-title {
  margin: 0 0 10px;
  font-size: 1.32rem;
  font-weight: 400;
  color: var(--paper);
}

.page-contact .pc-case-scene p {
  margin: 0;
  max-width: 40em;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--silver-500);
}

.page-contact .pc-case-fit {
  padding-left: 18px;
  border-left: 2px solid transparent;
  transition: border-color 240ms ease;
}

.page-contact .pc-fit-label {
  margin: 0 0 8px;
  color: var(--silver-500);
}

.page-contact .pc-case-fit p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver-500);
  transition: color 240ms ease;
}

.page-contact .pc-case:hover,
.page-contact .pc-case:focus-within {
  background: var(--ink-800);
}

.page-contact .pc-case:hover .pc-case-fit,
.page-contact .pc-case:focus-within .pc-case-fit {
  border-left-color: var(--cyan);
}

.page-contact .pc-case:hover .pc-case-fit p,
.page-contact .pc-case:focus-within .pc-case-fit p {
  color: var(--silver-200);
}

/* ---------- 材料清单（浅色画布） ---------- */
.page-contact .pc-prep {
  padding: var(--section-y) 0;
  background: var(--silver-050);
  color: var(--ink-900);
}

.page-contact .pc-prep .eyebrow {
  color: var(--ink-500);
}

.page-contact .pc-prep .section-title {
  color: var(--ink-900);
  max-width: 22em;
}

.page-contact .pc-prep-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
  align-items: start;
}

.page-contact .pc-prep-lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-contact .pc-prep-list {
  list-style: none;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-contact .pc-prep-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 20px;
  padding: 22px 0;
  border-top: 1px solid rgba(44, 59, 88, 0.22);
}

.page-contact .pc-prep-no {
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  color: var(--gold);
  padding-top: 4px;
}

.page-contact .pc-prep-title {
  margin: 0 0 6px;
  font-size: 1.06rem;
  font-weight: 500;
  color: var(--ink-900);
}

.page-contact .pc-prep-item p {
  margin: 0;
  max-width: 42em;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-contact .pc-prep-side {
  padding: clamp(24px, 3vw, 34px);
  border-radius: var(--pc-radius);
  background: var(--paper);
  border: 1px solid rgba(44, 59, 88, 0.16);
}

.page-contact .pc-side-label {
  margin: 0;
  color: var(--ink-500);
}

.page-contact .pc-side-stat {
  margin: 10px 0 0;
  font-size: clamp(2.2rem, 5vw, 3rem);
  font-weight: 300;
  line-height: 1;
  color: var(--ink-900);
}

.page-contact .pc-side-stat .mono {
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-contact .pc-side-desc {
  margin: 14px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ink-500);
}

.page-contact .pc-side-notes {
  list-style: none;
  margin: 22px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid rgba(44, 59, 88, 0.16);
  display: grid;
  gap: 14px;
}

.page-contact .pc-side-notes li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-700);
}

.page-contact .pc-side-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-contact .pc-side-btn {
  margin-top: 24px;
  width: 100%;
  border-color: rgba(44, 59, 88, 0.32);
  color: var(--ink-700);
}

.page-contact .pc-side-btn:hover,
.page-contact .pc-side-btn:focus-visible {
  border-color: var(--cyan);
  color: var(--ink-900);
}

/* ---------- 联系渠道信息台 ---------- */
.page-contact .pc-desk {
  padding: var(--section-y) 0;
  background: var(--ink-900);
}

.page-contact .pc-desk-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
  align-items: start;
}

.page-contact .pc-channel-list {
  margin: clamp(28px, 4vw, 44px) 0 0;
  display: grid;
  gap: 0;
}

.page-contact .pc-channel {
  padding: clamp(22px, 3vw, 30px) 0;
  border-top: 1px solid var(--ink-500);
  transition: background-color 240ms ease;
}

.page-contact .pc-channel:hover {
  background: var(--ink-800);
}

.page-contact .pc-channel-key {
  margin: 0 0 12px;
  color: var(--silver-500);
}

.page-contact .pc-channel-value {
  margin: 0;
  font-size: clamp(1.02rem, 2.2vw, 1.32rem);
  color: var(--cyan);
  letter-spacing: -0.01em;
  word-break: break-all;
}

.page-contact .pc-channel-value--text {
  font-family: var(--font-sans);
  font-size: 1.06rem;
  color: var(--silver-200);
  word-break: break-word;
}

.page-contact .pc-channel-desc {
  margin: 10px 0 0;
  max-width: 44em;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--silver-500);
}

.page-contact .pc-desk-note {
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--ink-500);
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--silver-500);
}

.page-contact .pc-desk-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 22px;
  font-size: 0.9rem;
}

.page-contact .pc-desk-links a {
  color: var(--silver-200);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-500);
  padding-bottom: 3px;
  transition: color 240ms ease, border-color 240ms ease;
}

.page-contact .pc-desk-links a:hover,
.page-contact .pc-desk-links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-contact .pc-desk-side {
  display: grid;
  gap: 20px;
}

.page-contact .pc-desk-figure {
  aspect-ratio: 5 / 7;
  border-radius: var(--pc-radius);
  overflow: hidden;
  margin: 0;
}

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

.page-contact .pc-desk-side-note {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--silver-500);
}

/* ---------- 响应式 ---------- */
@media (max-width: 719px) {
  .page-contact .pc-hero-shape {
    width: 100%;
    clip-path: polygon(0 58%, 100% 34%, 100% 100%, 0 100%);
  }

  .page-contact .pc-hero-title {
    max-width: none;
    font-size: clamp(2rem, 8vw, 2.6rem);
  }

  .page-contact .pc-hero-actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }

  .page-contact .pc-hero-meta {
    flex-direction: column;
    gap: 12px;
  }
}

@media (min-width: 860px) {
  .page-contact .pc-case {
    grid-template-columns: 7fr 4fr;
    column-gap: clamp(28px, 5vw, 72px);
    padding-inline: 20px;
  }
}

@media (min-width: 960px) {
  .page-contact .pc-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    position: relative;
  }

  .page-contact .pc-steps::before {
    content: "";
    position: absolute;
    top: 28px;
    left: 10%;
    right: 10%;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--cyan) 0%, var(--ink-500) 48%, var(--ink-500) 100%);
    opacity: 0.5;
  }

  .page-contact .pc-step {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto;
    gap: 12px;
    position: relative;
    padding: 0 22px 0 0;
    border-left: 0;
  }

  .page-contact .pc-step-no {
    grid-row: auto;
    position: relative;
    z-index: 1;
  }

  .page-contact .pc-step-title {
    margin-top: 6px;
  }

  .page-contact .pc-prep-grid,
  .page-contact .pc-desk-grid {
    grid-template-columns: 7fr 4fr;
  }

  .page-contact .pc-desk-side {
    position: sticky;
    top: calc(var(--top-offset) + 32px);
  }
}