.page-contact {
  --contact-max: 68ch;
  background: var(--frost);
  color: var(--ink);
}

.page-contact [id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-contact .breadcrumb {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏：框景信封 ---------- */
.page-contact .contact-hero {
  padding-top: clamp(10px, 2vw, 18px);
}

.page-contact .contact-hero-frame {
  display: grid;
  gap: 10px;
  padding: 10px;
  background: var(--night-blue);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.page-contact .contact-hero-media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(140deg, #0d3a58, #16465f 50%, #23546f);
}

.page-contact .contact-hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-contact .contact-hero-copy {
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: center;
  padding: clamp(20px, 4vw, 40px);
  background: var(--frost);
  border-radius: var(--radius);
}

.page-contact .contact-hero-copy .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
  text-transform: uppercase;
}

.page-contact .contact-hero-copy h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  font-size: clamp(1.8rem, 6.8vw, 2.5rem);
  color: var(--night-blue);
}

.page-contact .contact-hero-lead {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.85;
  color: var(--ink);
}

.page-contact .contact-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

/* ---------- 双栏主体 ---------- */
.page-contact .contact-body {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  padding-top: clamp(34px, 6vw, 70px);
  padding-bottom: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-contact .contact-col {
  min-width: 0;
}

.page-contact .contact-col > .section {
  padding-top: 0;
  padding-bottom: 0;
}

.page-contact .contact-col--rail > .section + .section {
  margin-top: clamp(26px, 4vw, 40px);
}

.page-contact .section-head {
  display: grid;
  gap: 6px;
  margin-bottom: clamp(16px, 3vw, 24px);
}

.page-contact .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.32;
  font-size: clamp(1.3rem, 3.6vw, 1.7rem);
  color: var(--night-blue);
}

.page-contact .section-sub {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-blue);
  opacity: 0.78;
}

/* ---------- 合作方向清单 ---------- */
.page-contact .paths-grid {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  align-items: start;
}

.page-contact .path-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .path-item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: clamp(16px, 2.6vw, 22px) 0;
  border-top: var(--line);
}

.page-contact .path-item:last-child {
  border-bottom: var(--line);
}

.page-contact .path-num {
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-contact .path-body h3 {
  margin: 0 0 8px;
  font-size: clamp(1rem, 2.8vw, 1.125rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--night-blue);
}

.page-contact .path-body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-contact .path-body p.path-case {
  margin-bottom: 0;
  padding-left: 12px;
  border-left: 2px solid var(--pale-blue);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-blue);
}

.page-contact .path-media {
  margin: 0;
  max-width: 320px;
}

.page-contact .path-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--line);
  border-radius: var(--radius);
  object-fit: cover;
}

.page-contact .path-media figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-blue);
  opacity: 0.8;
}

/* ---------- 流程刻度 ---------- */
.page-contact .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-contact .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--pale-blue);
}

.page-contact .timeline-step {
  position: relative;
  padding-left: 26px;
  padding-bottom: 14px;
}

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

.page-contact .timeline-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-blue);
  box-shadow: 0 0 0 3px var(--frost);
}

.page-contact .step summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 2px 0 6px;
  cursor: pointer;
  list-style: none;
}

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

.page-contact .step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--ice-blue);
}

.page-contact .step[open] summary::after {
  content: "−";
  color: var(--signal);
}

.page-contact .step-name {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--night-blue);
}

.page-contact .step-time {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-blue);
  opacity: 0.72;
}

.page-contact .step-body {
  padding: 4px 0 12px;
  border-bottom: var(--line);
}

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

.page-contact .step-body p.step-need {
  margin-bottom: 0;
  padding: 8px 10px;
  background: var(--cream);
  border-radius: var(--radius-sm);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-blue);
}

/* ---------- 联系信息卡 ---------- */
.page-contact .contact-card {
  display: grid;
  gap: 18px;
  padding: clamp(22px, 4vw, 30px);
  background: var(--night-blue);
  color: var(--frost);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.page-contact .contact-lines {
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-contact .contact-line {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(201, 216, 226, 0.22);
}

.page-contact .contact-line:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .contact-line dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pale-blue);
}

.page-contact .contact-line dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 3.4vw, 17px);
  letter-spacing: 0.02em;
  color: #fff;
  word-break: break-word;
}

.page-contact .contact-line dd.contact-address {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  letter-spacing: 0;
  color: var(--frost);
}

.page-contact .contact-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--pale-blue);
}

/* ---------- 典型场景 ---------- */
.page-contact .contact-scenes {
  padding-bottom: clamp(28px, 5vw, 52px);
}

.page-contact .scene-grid {
  display: grid;
  gap: 12px;
}

.page-contact .scene-card {
  padding: clamp(18px, 3vw, 24px);
  background: var(--frost);
  border: var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-contact .scene-card:hover {
  border-color: var(--ink-blue);
  transform: translateY(-2px);
}

.page-contact .scene-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-contact .scene-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--night-blue);
}

.page-contact .scene-card p.scene-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 常见问题 ---------- */
.page-contact .contact-faq {
  padding-bottom: clamp(28px, 5vw, 52px);
}

.page-contact .faq-grid {
  display: grid;
  gap: 10px;
  align-items: start;
}

.page-contact .faq-item {
  padding: 14px 16px;
  background: var(--cream);
  border: var(--line);
  border-radius: var(--radius);
}

.page-contact .faq-item summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--night-blue);
}

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

.page-contact .faq-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--ice-blue);
}

.page-contact .faq-item[open] summary::after {
  content: "−";
  color: var(--signal);
}

.page-contact .faq-item p {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 延伸入口 ---------- */
.page-contact .contact-next {
  padding-bottom: clamp(32px, 6vw, 64px);
}

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

.page-contact .next-list a {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--frost);
  border: var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-contact .next-list a:hover,
.page-contact .next-list a:focus-visible {
  border-color: var(--ink-blue);
  transform: translateY(-2px);
}

.page-contact .next-list a:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-contact .next-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--night-blue);
}

.page-contact .next-label::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--signal);
}

.page-contact .next-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink);
  opacity: 0.82;
}

/* ---------- 协作生态带 ---------- */
.page-contact .ecosystem {
  margin-top: clamp(16px, 3vw, 32px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: var(--line);
  background: var(--cream);
}

.page-contact .ecosystem-inner {
  max-width: var(--width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-contact .ecosystem-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-blue);
}

.page-contact .ecosystem-track {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scroll-padding-left: var(--gutter);
  padding: 0 var(--gutter) clamp(20px, 3vw, 28px);
}

@supports (mask-image: linear-gradient(90deg, #000, transparent)) {
  .page-contact .ecosystem-track {
    mask-image: linear-gradient(
      90deg,
      transparent 0,
      #000 20px,
      #000 calc(100% - 20px),
      transparent 100%
    );
  }
}

.page-contact .ecosystem-chip {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  min-height: 44px;
  padding: 10px 16px;
  background: var(--frost);
  border: 1px solid var(--pale-blue);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-blue);
  white-space: nowrap;
}

.page-contact .ecosystem-chip strong {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--signal);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-contact .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-contact .faq-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .page-contact .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero-frame {
    grid-template-columns: 1.06fr 0.94fr;
    gap: 12px;
    padding: 12px;
  }

  .page-contact .contact-hero-media img {
    aspect-ratio: auto;
    min-height: 400px;
    height: 100%;
  }

  .page-contact .contact-hero-copy h1 {
    font-size: clamp(2rem, 3.4vw, 3rem);
  }
}

@media (min-width: 980px) {
  .page-contact .contact-body {
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }
}

@media (min-width: 1120px) {
  .page-contact .paths-grid {
    grid-template-columns: minmax(0, 1fr) 210px;
    gap: 24px;
  }

  .page-contact .path-media {
    max-width: none;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (max-width: 480px) {
  .page-contact .contact-hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .page-contact .contact-line dd {
    font-size: 14px;
  }
}