.page-contact {
  --co-shear: 26px;
}

.page-contact .breadcrumb {
  padding: 22px 0 0;
}

/* ---------- 首屏：左重右轻的对接窗口 ---------- */
.page-contact .co-hero {
  padding: 20px 0 60px;
  border-bottom: 1px solid var(--line);
}

.page-contact .co-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

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

.page-contact h1 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(2.1rem, 8vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 14px 0 20px;
  overflow-wrap: break-word;
}

.page-contact .co-hero .lead {
  color: var(--paper);
  opacity: 0.82;
  max-width: 46ch;
}

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

.page-contact .co-hero-aside {
  align-self: start;
  min-width: 0;
  padding-left: 22px;
  border-left: 1px solid var(--gold-line);
}

.page-contact .co-aside-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--mute);
  margin: 0 0 20px;
}

.page-contact .co-channel-mini {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-contact .co-channel-mini li {
  min-width: 0;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-contact .co-channel-mini li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .co-mini-label {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--paper);
}

.page-contact .co-mini-note {
  display: block;
  margin-top: 7px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mute);
}

.page-contact .co-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--patina);
}

.page-contact .co-dot--gold {
  background: var(--gold);
}

.page-contact .co-dot--crimson {
  background: var(--crimson);
}

/* ---------- 章节骨架 ---------- */
.page-contact .co-section {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}

.page-contact .co-section:first-of-type {
  border-top: 0;
}

.page-contact .co-section--alt {
  background: var(--ink-2);
}

.page-contact .co-head {
  max-width: 62ch;
  margin-bottom: 36px;
}

.page-contact .co-head h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.6rem, 4.6vw, 2.25rem);
  line-height: 1.24;
  color: var(--paper);
  margin: 12px 0 14px;
}

.page-contact .co-head p {
  margin: 0;
  line-height: 1.85;
  color: var(--mute);
}

/* ---------- 四类合作方向：斜切角方块 ---------- */
.page-contact .co-dirs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-contact .co-dir {
  position: relative;
  min-width: 0;
  padding: 26px 22px 24px;
  background: var(--bronze);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--co-shear)),
    calc(100% - var(--co-shear)) 100%,
    0 100%
  );
}

.page-contact .co-dir::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--gold);
}

.page-contact .co-dir-idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-contact .co-dir h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--paper);
  margin: 10px 0 14px;
}

.page-contact .co-dir p {
  margin: 0 0 10px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mute);
}

.page-contact .co-dir p:last-child {
  margin-bottom: 0;
}

.page-contact .co-dir .co-fit {
  color: var(--paper);
  opacity: 0.88;
}

.page-contact .co-label {
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--gold-lite);
}

.page-contact .co-figure {
  margin: 34px 0 0;
}

.page-contact .co-figure--side {
  margin: 0;
}

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

.page-contact .co-media-3x2 {
  aspect-ratio: 3 / 2;
}

.page-contact .co-media-10x7 {
  aspect-ratio: 10 / 7;
}

/* ---------- 对接流程：等宽数字连成的刻度线 ---------- */
.page-contact .co-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-contact .co-steps li {
  position: relative;
  min-width: 0;
  padding-top: 30px;
}

.page-contact .co-steps li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line-strong);
}

.page-contact .co-steps li::after {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
}

.page-contact .co-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-contact .co-step-title {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
  margin: 10px 0 6px;
}

.page-contact .co-step-time {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--patina);
}

.page-contact .co-steps p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mute);
}

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

.page-contact .co-mat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .co-mat-idx {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--gold);
}

.page-contact .co-mat h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
}

.page-contact .co-mat p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 渠道控制台 ---------- */
.page-contact .co-channels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-contact .co-ch-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-contact .co-ch {
  min-width: 0;
  padding: 20px 20px 18px;
  background: var(--bronze);
  border-left: 2px solid var(--gold);
}

.page-contact .co-ch-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-contact .co-ch-name {
  font-weight: 600;
  color: var(--paper);
}

.page-contact .co-ch-value {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  color: var(--gold-lite);
  overflow-wrap: anywhere;
}

.page-contact .co-ch-note {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--mute);
}

.page-contact .co-links {
  margin: 34px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--mute);
}

.page-contact .co-links a {
  color: var(--gold-lite);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
}

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

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  border-top: 1px solid var(--line);
}

.page-contact .co-faq-item {
  border-bottom: 1px solid var(--line);
}

.page-contact .co-faq-item summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
}

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

.page-contact .co-faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--gold);
}

.page-contact .co-faq-item[open] summary::after {
  content: "−";
}

.page-contact .co-faq-idx {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--mute);
}

.page-contact .co-faq-item p {
  margin: 0 0 20px;
  padding-left: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mute);
}

.page-contact .co-faq-item p a {
  color: var(--gold-lite);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-contact .co-hero {
    padding: 26px 0 84px;
  }

  .page-contact .co-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-contact .co-section {
    padding: 84px 0;
  }

  .page-contact .co-dirs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .co-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px 28px;
  }

  .page-contact .co-mats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
  }

  .page-contact .co-channels {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-contact .co-faq-item p {
    padding-left: 42px;
    padding-right: 32px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-contact h1 {
    font-size: clamp(2.6rem, 5.2vw, 4.4rem);
  }

  .page-contact .co-dirs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-contact .co-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 30px;
  }

  .page-contact .co-figure {
    margin-top: 42px;
  }
}