.page-contact {
  --coop-cut: 18px;
  background: var(--mist);
}

.page-contact .coop-breadcrumb {
  padding-top: 22px;
  padding-bottom: 2px;
}

.page-contact h2 {
  margin: 10px 0 0;
  font-size: clamp(1.5rem, 4.6vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-contact .coop-section-note {
  margin: 14px 0 0;
  max-width: 58ch;
  color: var(--ink-soft);
  font-size: 0.97rem;
  line-height: 1.78;
}

.page-contact p a,
.page-contact dd a,
.page-contact .fold-body a {
  color: var(--sky);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-contact .coop-hero {
  padding: 14px 0 46px;
  background: linear-gradient(158deg, rgba(10, 110, 189, 0.08), rgba(127, 200, 232, 0) 62%);
}

.page-contact .coop-hero-grid {
  display: grid;
  gap: 30px;
}

.page-contact .coop-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(1.95rem, 7.2vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-contact .coop-hero .lede {
  margin: 16px 0 0;
  max-width: 42ch;
  color: var(--ink-soft);
  font-size: 1.0625rem;
  line-height: 1.78;
}

.page-contact .coop-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

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

.page-contact .coop-fact {
  padding: 16px 15px 18px;
  background: var(--white);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-contact .coop-fact-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-contact .coop-fact-value {
  display: block;
  margin-top: 8px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.2;
  color: var(--sky);
}

/* ---------- 三类方向 ---------- */
.page-contact .coop-tabs {
  margin-top: 26px;
}

.page-contact .coop-tablist {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-contact .coop-tab {
  display: flex;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  padding: 15px 18px;
  font: inherit;
  font-weight: 700;
  text-align: left;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-contact .coop-tab:hover {
  border-color: var(--sky);
}

.page-contact .coop-tab:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--saffron);
}

.page-contact .coop-tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}

.page-contact .coop-tab-num {
  font-size: 0.82rem;
  color: var(--gold-deep);
}

.page-contact .coop-tab[aria-selected="true"] .coop-tab-num {
  color: var(--gold);
}

.page-contact .coop-panel {
  margin-top: 16px;
  padding: 4px 20px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--coop-cut)), calc(100% - var(--coop-cut)) 100%, 0 100%);
}

.page-contact .coop-panel::before {
  content: "";
  display: block;
  height: 3px;
  margin: 0 -20px 20px;
  background: linear-gradient(90deg, var(--sky), var(--glacier), var(--gold));
}

.page-contact .coop-panel-lede {
  margin: 0 0 20px;
  max-width: 58ch;
  color: var(--ink-soft);
  line-height: 1.78;
  font-size: 0.99rem;
}

.page-contact .coop-panel-spec {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
}

.page-contact .coop-panel-spec dt {
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--saffron);
}

.page-contact .coop-panel-spec dd {
  margin: 0;
  color: var(--ink);
  font-size: 0.96rem;
  line-height: 1.72;
}

/* ---------- 四步流程 ---------- */
.page-contact .coop-steps {
  display: grid;
  grid-template-columns: 1fr;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--white);
  border: 1px solid var(--line);
}

.page-contact .coop-step {
  position: relative;
  padding: 24px 22px 26px;
  border-bottom: 1px solid var(--line);
}

.page-contact .coop-step:last-child {
  border-bottom: 0;
}

.page-contact .coop-step-num {
  display: block;
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold-deep);
}

.page-contact .coop-step h3 {
  margin: 12px 0 8px;
  font-size: 1.1rem;
  color: var(--ink);
}

.page-contact .coop-step p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-contact .coop-flow-figure {
  margin: 24px 0 0;
}

.page-contact .coop-flow-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  background: var(--white);
  border: 1px solid var(--line);
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-contact .coop-flow-figure .media-caption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--rock);
}

/* ---------- 响应节奏 ---------- */
.page-contact .coop-timing-band {
  display: grid;
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .coop-timing-item {
  padding: 20px 20px 22px;
  background: var(--white);
}

.page-contact .coop-timing-num {
  display: block;
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--sky);
}

.page-contact .coop-timing-label {
  display: block;
  margin-top: 8px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 联系信息 ---------- */
.page-contact .coop-contact-panel {
  position: relative;
  overflow: hidden;
  padding: 40px 22px 42px;
  background: var(--ink);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-contact .coop-contact-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
}

.page-contact .coop-contact-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 36, 54, 0.72), rgba(11, 36, 54, 0.95));
}

.page-contact .coop-contact-inner {
  position: relative;
  z-index: 1;
}

.page-contact .coop-contact-panel .eyebrow {
  color: var(--glacier);
}

.page-contact .coop-contact-panel h2 {
  color: var(--white);
}

.page-contact .coop-channels {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .coop-ch-item {
  display: grid;
  gap: 5px;
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-contact .coop-ch-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--glacier);
}

.page-contact .coop-ch-value {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

.page-contact .coop-note {
  margin: 22px 0 0;
  max-width: 52ch;
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 投稿与收录 ---------- */
.page-contact .coop-standard-grid {
  display: grid;
  gap: 28px;
}

.page-contact .coop-standard-lead .coop-section-note:first-of-type {
  margin-top: 16px;
}

.page-contact .coop-checklist {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .coop-check {
  position: relative;
  padding: 14px 16px 14px 48px;
  background: var(--white);
  border: 1px solid var(--line);
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--ink-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-contact .coop-check::before {
  content: "✓";
  position: absolute;
  left: 17px;
  top: 12px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--green);
}

/* ---------- 常见问题 ---------- */
.page-contact .coop-faq-grid {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-contact .fold {
  background: var(--white);
  border: 1px solid var(--line);
}

.page-contact .fold summary {
  padding: 16px 18px;
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.page-contact .fold summary::after {
  content: "＋";
  float: right;
  margin-left: 12px;
  font-family: var(--mono);
  color: var(--sky);
}

.page-contact .fold[open] summary::after {
  content: "－";
  color: var(--saffron);
}

.page-contact .fold-body {
  padding: 0 18px 18px;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-contact .fold-body p {
  margin: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact .coop-tablist {
    flex-direction: row;
    align-items: stretch;
  }

  .page-contact .coop-tab {
    flex: 1 1 0;
  }

  .page-contact .coop-tab:nth-child(1) {
    flex-grow: 1.16;
  }

  .page-contact .coop-tab:nth-child(2) {
    flex-grow: 1;
  }

  .page-contact .coop-tab:nth-child(3) {
    flex-grow: 0.88;
  }

  .page-contact .coop-panel-spec {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .coop-timing-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-contact .coop-contact-panel {
    padding: 52px 40px 56px;
  }
}

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

  .page-contact .coop-step {
    padding: 26px 22px 30px;
    border-bottom: 0;
  }

  .page-contact .coop-step:not(:first-child)::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10%;
    height: 80%;
    width: 2px;
    background: linear-gradient(180deg, var(--sky), var(--glacier));
    transform: skewX(-12deg);
    opacity: 0.75;
  }
}

@media (min-width: 900px) {
  .page-contact .coop-hero {
    padding: 22px 0 62px;
  }

  .page-contact .coop-hero-grid {
    grid-template-columns: 62fr 38fr;
    gap: 48px;
    align-items: start;
  }

  .page-contact .coop-standard-grid {
    grid-template-columns: 42fr 58fr;
    gap: 40px;
    align-items: start;
  }

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

@media (min-width: 1100px) {
  .page-contact .coop-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .coop-contact-panel {
    padding: 60px 56px 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .coop-tab {
    transition: none;
  }
}