.page-contact {
  --coop-glass: rgba(35, 42, 49, .72);
  --coop-hair: rgba(59, 70, 80, .65);
  --coop-text: #C7D2D9;
  background: var(--karst-ink);
  color: var(--mist-stone);
}

/* ---------- 面包屑 ---------- */
.page-contact__crumbs {
  padding-top: clamp(14px, 2.4vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-contact__hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 52px) clamp(20px, 3vw, 40px);
}

.page-contact__hero::before {
  content: "";
  position: absolute;
  inset: -25% -12% auto -12%;
  height: 560px;
  background:
    radial-gradient(58% 78% at 18% 22%, rgba(20, 160, 165, .30), transparent 70%),
    radial-gradient(48% 66% at 82% 8%, rgba(255, 106, 26, .20), transparent 72%);
  filter: blur(8px);
  pointer-events: none;
}

.page-contact__hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
}

.page-contact__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-4);
  line-height: .96;
  letter-spacing: -.02em;
  color: var(--mist-stone);
  max-width: 20ch;
}

.page-contact__lead {
  margin: 18px 0 0;
  max-width: 50ch;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--coop-text);
}

.page-contact__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-contact__facts {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--coop-hair);
}

.page-contact__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-contact__facts .num {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1;
  color: var(--turf-lime);
}

.page-contact__facts .dim {
  font-size: var(--step--1);
  line-height: 1.6;
}

.page-contact__hero-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--fog-line);
  background: var(--slate-rock);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-contact__hero-frame img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

/* ---------- 章节索引 ---------- */
.page-contact__index-wrap {
  margin-block: 6px clamp(20px, 3vw, 32px);
}

.page-contact .index-rail {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  border-bottom: 1px solid var(--coop-hair);
  -webkit-overflow-scrolling: touch;
}

.page-contact .index-rail li {
  flex: 0 0 auto;
}

.page-contact .index-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: var(--step--1);
  letter-spacing: .14em;
  text-decoration: none;
  white-space: nowrap;
  color: var(--dim);
  border: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-contact .index-rail__link::before {
  content: attr(data-ord);
  font-family: var(--font-mono);
  font-size: .92em;
  color: var(--waterfall-teal);
}

.page-contact .index-rail__link:hover,
.page-contact .index-rail__link.is-current {
  color: var(--mist-stone);
  border-color: rgba(182, 255, 60, .45);
  background: rgba(182, 255, 60, .07);
}

/* ---------- 主体布局 ---------- */
.page-contact__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-contact__stream {
  min-width: 0;
}

.page-contact__section {
  padding-block: clamp(30px, 4.4vw, 56px);
  border-top: 1px solid rgba(59, 70, 80, .45);
}

.page-contact__section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-contact__head {
  max-width: 60ch;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-contact__head .section-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 5.4vw, 3.6rem);
  line-height: .9;
  letter-spacing: -.02em;
  color: rgba(182, 255, 60, .32);
}

.page-contact__head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-3);
  line-height: 1.15;
  letter-spacing: -.01em;
}

.page-contact__head p {
  margin: 12px 0 0;
  color: var(--dim);
  font-size: var(--step-0);
  line-height: 1.75;
}

/* ---------- 01 合作方向卡片 ---------- */
.page-contact__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .coop-card {
  transition: transform .32s var(--ease), filter .32s var(--ease);
}

.page-contact .coop-card:hover {
  transform: translateY(-6px);
  filter: brightness(1.06);
}

.page-contact .coop-card__body {
  display: grid;
  gap: 12px;
  padding: 20px 18px 22px;
}

.page-contact .coop-card__body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-2);
  line-height: 1.2;
}

.page-contact .coop-card__meta {
  display: grid;
  gap: 10px;
  margin: 0;
}

.page-contact .coop-card__meta > div {
  display: grid;
  grid-template-columns: 4.6em minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-contact .coop-card__meta dt {
  font-size: var(--step--1);
  letter-spacing: .12em;
  color: var(--waterfall-teal);
}

.page-contact .coop-card__meta dd {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--coop-text);
}

/* ---------- 02 流程时间轴 ---------- */
.page-contact__flow {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .flow__step {
  position: relative;
  padding-top: 52px;
}

.page-contact .flow__node {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--mist-stone);
  background: linear-gradient(150deg, rgba(20, 160, 165, .45), rgba(35, 42, 49, .9));
  border: 1px solid rgba(20, 160, 165, .7);
  border-radius: 50%;
}

.page-contact .flow__title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-1);
}

.page-contact .flow__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--pulse-orange);
}

.page-contact .flow__desc {
  margin: 10px 0 0;
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--coop-text);
}

.page-contact .flow__out {
  margin: 12px 0 0;
  padding-left: 10px;
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--dim);
  border-left: 2px solid var(--waterfall-teal);
}

.page-contact__flow-media {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-contact__flow-frame {
  display: block;
  overflow: hidden;
  border: 1px solid var(--fog-line);
  background: var(--slate-rock);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-contact__flow-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-contact__flow-note {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--dim);
}

/* ---------- 03 材料清单 ---------- */
.page-contact__materials {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .materials__col {
  padding: 18px 18px 20px;
  background: var(--slate-rock);
  border-top: 2px solid var(--waterfall-teal);
  transition: transform .3s var(--ease);
}

.page-contact .materials__col:hover {
  transform: translateY(-4px);
}

.page-contact .materials__col h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-1);
  color: var(--mist-stone);
}

.page-contact .materials__col ul {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .materials__col li {
  position: relative;
  padding-left: 16px;
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--coop-text);
}

.page-contact .materials__col li::before {
  content: "";
  position: absolute;
  top: .62em;
  left: 0;
  width: 7px;
  height: 2px;
  background: var(--turf-lime);
}

.page-contact__hint {
  margin: 20px 0 0;
  padding: 16px 18px;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--coop-text);
  background: linear-gradient(120deg, rgba(20, 160, 165, .14), rgba(35, 42, 49, .8));
  border-left: 3px solid var(--pulse-orange);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

/* ---------- 04 合作实例 ---------- */
.page-contact__cases {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .case {
  padding: 20px 18px 22px;
  background: linear-gradient(155deg, rgba(20, 160, 165, .13), rgba(35, 42, 49, .92));
  border-left: 3px solid var(--turf-lime);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-contact .case:hover {
  transform: translateY(-4px);
  border-left-color: var(--pulse-orange);
}

.page-contact .case h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-1);
}

.page-contact .case p {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--coop-text);
}

/* ---------- 05 联系面板 ---------- */
.page-contact__contact {
  min-width: 0;
}

.page-contact__contact-panel {
  position: relative;
  padding: 22px 20px 24px;
  background:
    linear-gradient(165deg, var(--coop-glass), rgba(20, 24, 28, .95)),
    var(--slate-rock);
  border: 1px solid var(--fog-line);
  backdrop-filter: blur(10px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  box-shadow: 0 0 0 1px rgba(20, 160, 165, .12), 0 18px 40px -28px rgba(0, 0, 0, .9);
  transition: box-shadow .4s var(--ease), transform .4s var(--ease);
}

.page-contact__contact-panel:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 0 1px rgba(182, 255, 60, .35), 0 22px 46px -26px rgba(0, 0, 0, .95);
}

.page-contact__contact-panel h2 {
  margin: 8px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-2);
  line-height: 1.2;
}

.page-contact__channels {
  display: grid;
  gap: 12px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-contact__channels li {
  display: grid;
  gap: 5px;
  padding-bottom: 11px;
  border-bottom: 1px solid var(--coop-hair);
}

.page-contact__ch-label {
  font-size: var(--step--1);
  letter-spacing: .14em;
  color: var(--waterfall-teal);
}

.page-contact__ch-value {
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--mist-stone);
  word-break: break-word;
}

.page-contact__ch-value.mono {
  font-family: var(--font-mono);
  font-size: .95rem;
  letter-spacing: .01em;
}

.page-contact__contact-note {
  margin: 0 0 18px;
  font-size: var(--step--1);
  line-height: 1.75;
}

.page-contact__rel {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact__cards,
  .page-contact__cases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact__materials {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-contact__flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-contact__flow::before {
    content: "";
    position: absolute;
    top: 21px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--waterfall-teal), rgba(20, 160, 165, .18), var(--pulse-orange));
    pointer-events: none;
  }

  .page-contact__flow-media {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: center;
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .page-contact__hero-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-contact__hero-copy {
    grid-column: span 7;
  }

  .page-contact__hero-media {
    grid-column: span 5;
  }

  .page-contact__layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-contact__contact {
    position: sticky;
    top: 104px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .coop-card,
  .page-contact .materials__col,
  .page-contact .case,
  .page-contact__contact-panel,
  .page-contact .index-rail__link {
    transition: none;
  }

  .page-contact .coop-card:hover,
  .page-contact .materials__col:hover,
  .page-contact .case:hover,
  .page-contact__contact-panel:hover {
    transform: none;
  }
}