.page-contact {
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-contact .breadcrumbs {
  padding: 18px 0 0;
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line-hair);
  position: relative;
  overflow: hidden;
}

.page-contact .co-hero::after {
  content: "";
  position: absolute;
  right: -90px;
  top: -120px;
  width: 340px;
  height: 340px;
  border: 1px solid var(--line-hair);
  border-radius: 50%;
  pointer-events: none;
}

.page-contact .co-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
  position: relative;
  z-index: 1;
}

.page-contact .co-hero-copy h1 {
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(30px, 6vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ivory);
  margin: 14px 0 20px;
  max-width: 15ch;
}

.page-contact .co-hero-copy .eyebrow {
  color: var(--cyan);
  font-family: var(--font-en);
  letter-spacing: 0.16em;
}

.page-contact .co-hero-copy .lede {
  color: var(--mute);
  font-size: var(--fs-16);
  line-height: 1.8;
}

.page-contact .co-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-contact .co-hero-media {
  border: 1px solid var(--line-soft);
  background: var(--turf-deep);
  position: relative;
}

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

.page-contact .co-hero-media::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 16, 12, 0.1) 0%, rgba(4, 16, 12, 0.72) 100%);
  pointer-events: none;
  z-index: 1;
}

.page-contact .co-hero-media .media-caption {
  position: relative;
  z-index: 2;
}

/* ---------- 主体分栏 ---------- */
.page-contact .co-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 56px);
  padding-top: clamp(36px, 6vw, 72px);
}

/* ---------- 左侧联系栏 ---------- */
.page-contact .co-rail {
  background: linear-gradient(168deg, var(--turf) 0%, var(--ink) 72%);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  padding: 24px 20px 22px;
  align-self: start;
}

.page-contact .co-rail .eyebrow {
  color: var(--cyan-soft);
  font-family: var(--font-en);
  letter-spacing: 0.16em;
  font-size: var(--fs-12);
}

.page-contact .co-rail-title {
  font-size: var(--fs-20);
  line-height: 1.4;
  color: var(--ivory);
  margin: 10px 0 20px;
  font-weight: 700;
}

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

.page-contact .co-rail-item {
  display: grid;
  gap: 5px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-hair);
}

.page-contact .co-rail-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-contact .co-rail-label {
  font-size: var(--fs-12);
  color: var(--mute);
  letter-spacing: 0.08em;
}

.page-contact .co-rail-value {
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--ivory);
}

.page-contact .co-contact-link {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  word-break: break-all;
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-contact .co-contact-link:hover,
.page-contact .co-contact-link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  text-decoration-color: transparent;
  outline: none;
}

.page-contact .co-copy {
  justify-self: start;
  margin-top: 2px;
}

.page-contact .co-rail-media {
  margin-top: 22px;
  border: 1px solid var(--line-hair);
  background: var(--shade);
}

.page-contact .co-rail-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.78;
}

.page-contact .co-rail-media .media-caption {
  padding: 8px 0 0;
}

/* ---------- 右侧内容 ---------- */
.page-contact .co-body {
  min-width: 0;
}

.page-contact .co-section + .co-section {
  margin-top: clamp(44px, 7vw, 84px);
}

.page-contact .co-section .section-head {
  border-bottom: 1px solid var(--line-hair);
  padding-bottom: 14px;
  margin-bottom: 22px;
}

.page-contact .co-section .eyebrow {
  color: var(--cyan-soft);
  font-family: var(--font-en);
  letter-spacing: 0.16em;
  font-size: var(--fs-12);
}

.page-contact .co-section .section-title {
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.22;
  color: var(--ivory);
  margin: 10px 0 0;
  font-weight: 800;
  letter-spacing: -0.015em;
}

.page-contact .co-intro {
  color: var(--mute);
  font-size: var(--fs-16);
  line-height: 1.8;
  margin: 0 0 26px;
}

/* ---------- 合作方向 ---------- */
.page-contact .co-direction-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-hair);
}

.page-contact .co-direction {
  border-bottom: 1px solid var(--line-hair);
  border-left: 3px solid transparent;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-contact .co-direction[open] {
  border-left-color: var(--cyan);
  background: rgba(22, 64, 52, 0.28);
}

.page-contact .co-direction-summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 44px 1fr;
  grid-template-areas:
    "code name"
    "code hint";
  align-items: center;
  gap: 2px 16px;
  padding: 22px 16px 22px 12px;
  transition: transform 160ms var(--ease);
}

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

.page-contact .co-direction-summary:hover {
  transform: translateX(4px);
}

.page-contact .co-direction-code {
  grid-area: code;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  color: var(--cyan);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-soft);
  background: var(--ink);
}

.page-contact .co-direction[open] .co-direction-code {
  background: var(--cyan);
  color: var(--ink);
  border-color: var(--cyan);
}

.page-contact .co-direction-name {
  grid-area: name;
  font-size: clamp(17px, 2.2vw, var(--fs-20));
  font-weight: 700;
  color: var(--ivory);
  line-height: 1.3;
}

.page-contact .co-direction-hint {
  grid-area: hint;
  font-size: var(--fs-12);
  color: var(--mute);
  letter-spacing: 0.04em;
}

.page-contact .co-direction-body {
  padding: 0 16px 26px 72px;
  animation: co-fade 240ms ease-out;
}

.page-contact .co-dl {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-contact .co-dl dt {
  font-size: var(--fs-12);
  color: var(--cyan-soft);
  letter-spacing: 0.08em;
  margin-bottom: 3px;
}

.page-contact .co-dl dd {
  margin: 0 0 6px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ivory);
  max-width: 62ch;
}

.page-contact .co-direction-body .meta-line {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-hair);
}

/* ---------- 数据能力速览 ---------- */
.page-contact .co-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-hair);
  border: 1px solid var(--line-soft);
}

.page-contact .co-stat {
  background: var(--turf-deep);
  padding: 24px 20px 26px;
  display: grid;
  gap: 6px;
  align-content: start;
  position: relative;
}

.page-contact .co-stat::after {
  content: "";
  position: absolute;
  left: 20px;
  bottom: 18px;
  width: 28px;
  height: 1px;
  background: var(--line-soft);
}

.page-contact .co-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(44px, 8vw, var(--fs-72));
  line-height: 0.94;
  letter-spacing: -0.04em;
  color: var(--cyan);
  font-weight: 700;
}

.page-contact .co-stat .unit {
  font-size: var(--fs-12);
  color: var(--cyan-soft);
  letter-spacing: 0.1em;
}

.page-contact .co-stat p {
  margin: 12px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mute);
  max-width: 34ch;
}

.page-contact .co-stats-note {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
}

/* ---------- 四步流程 ---------- */
.page-contact .co-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  position: relative;
}

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

.page-contact .co-flow-step {
  border: 1px solid var(--line-hair);
  background: rgba(11, 31, 24, 0.55);
  transition: border-color 200ms var(--ease);
}

.page-contact .co-flow-step[open] {
  border-color: var(--line-soft);
}

.page-contact .co-flow-step summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 10px;
  padding: 16px 16px 18px;
}

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

.page-contact .co-flow-num {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  color: var(--cyan);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-soft);
  background: var(--ink);
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.page-contact .co-flow-step[open] .co-flow-num {
  background: var(--cyan);
  color: var(--ink);
  border-color: var(--cyan);
}

.page-contact .co-flow-title {
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--ivory);
  line-height: 1.4;
}

.page-contact .co-flow-body {
  padding: 0 16px 20px;
  animation: co-fade 240ms ease-out;
}

.page-contact .co-flow-body p {
  margin: 0 0 10px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mute);
}

.page-contact .co-flow-body p.meta-line {
  margin-bottom: 0;
  color: var(--cyan-soft);
}

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  display: grid;
  gap: 10px;
}

.page-contact .co-faq-item {
  border: 1px solid var(--line-hair);
  border-left: 3px solid var(--line-soft);
  background: var(--turf-deep);
  transition: border-left-color 200ms var(--ease);
}

.page-contact .co-faq-item[open] {
  border-left-color: var(--cyan);
}

.page-contact .co-faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--ivory);
  line-height: 1.5;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

.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: var(--fs-20);
  color: var(--cyan);
  flex: none;
}

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

.page-contact .co-faq-body {
  padding: 0 18px 20px;
  animation: co-fade 240ms ease-out;
}

.page-contact .co-faq-body p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mute);
  max-width: 62ch;
}

.page-contact .co-faq-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

/* ---------- 收束区块 ---------- */
.page-contact .co-closing {
  margin-top: clamp(48px, 8vw, 96px);
  padding: clamp(32px, 5vw, 56px) 0;
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(120deg, rgba(15, 42, 33, 0.55) 0%, rgba(8, 13, 11, 0) 62%);
}

.page-contact .co-closing-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

.page-contact .co-closing .eyebrow {
  color: var(--cyan-soft);
  font-family: var(--font-en);
  letter-spacing: 0.16em;
  font-size: var(--fs-12);
}

.page-contact .co-closing-title {
  font-size: clamp(24px, 3.8vw, 40px);
  line-height: 1.16;
  color: var(--ivory);
  margin: 12px 0 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-contact .co-closing-copy p {
  color: var(--mute);
  font-size: var(--fs-16);
  line-height: 1.8;
}

.page-contact .co-closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-contact .co-closing-card {
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  background: var(--ink);
  padding: 24px 22px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-contact .co-closing-mail,
.page-contact .co-closing-tel {
  font-family: var(--font-mono);
  color: var(--ivory);
  text-decoration: underline;
  text-underline-offset: 5px;
  text-decoration-color: var(--cyan);
  text-decoration-thickness: 2px;
  word-break: break-all;
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-contact .co-closing-mail {
  font-size: clamp(17px, 3.4vw, 24px);
}

.page-contact .co-closing-tel {
  font-size: clamp(17px, 3.2vw, 22px);
  margin-top: 12px;
}

.page-contact .co-closing-mail:hover,
.page-contact .co-closing-mail:focus-visible,
.page-contact .co-closing-tel:hover,
.page-contact .co-closing-tel:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  text-decoration-color: transparent;
  outline: none;
}

.page-contact .co-closing-card .co-copy {
  justify-self: start;
}

/* ---------- 动效 ---------- */
@keyframes co-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-direction-summary,
  .page-contact .co-direction-body,
  .page-contact .co-flow-body,
  .page-contact .co-faq-body {
    transition: none;
    animation: none;
  }
  .page-contact .co-direction-summary:hover {
    transform: none;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-contact .co-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 760px) {
  .page-contact .co-direction-summary {
    grid-template-columns: 56px 1fr auto;
    grid-template-areas: "code name hint";
    gap: 20px;
    padding: 24px 20px 24px 16px;
  }

  .page-contact .co-direction-body {
    padding: 0 20px 28px 92px;
  }

  .page-contact .co-dl {
    grid-template-columns: 120px 1fr;
    gap: 10px 22px;
    align-items: start;
  }

  .page-contact .co-dl dt {
    margin-bottom: 0;
    padding-top: 3px;
    text-align: right;
  }

  .page-contact .co-closing-inner {
    grid-template-columns: 8fr 4fr;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero-grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-contact .co-flow {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    padding-top: 6px;
  }

  .page-contact .co-flow::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 28px;
    height: 1px;
    background: var(--line-soft);
  }

  .page-contact .co-flow-item {
    padding-right: 18px;
  }

  .page-contact .co-flow-item:last-child {
    padding-right: 0;
  }

  .page-contact .co-flow-step {
    border: 0;
    background: transparent;
  }

  .page-contact .co-flow-step summary {
    padding: 0 0 0 0;
    background: var(--ink);
    padding-right: 12px;
    position: relative;
    z-index: 1;
  }

  .page-contact .co-flow-step[open] summary {
    background: var(--ink);
  }

  .page-contact .co-flow-body {
    padding: 14px 12px 0 0;
  }

  .page-contact .co-flow-num {
    position: relative;
    z-index: 2;
  }
}

@media (min-width: 980px) {
  .page-contact .co-layout {
    grid-template-columns: 300px minmax(0, 1fr);
  }

  .page-contact .co-rail {
    position: sticky;
    top: 28px;
  }
}