.page-contact {
  --contact-line: rgba(6, 26, 46, .10);
  --contact-soft: rgba(11, 22, 32, .68);
  background: var(--foam);
  color: var(--ink);
}

/* ---------- 首屏：海报层 + 联系展牌 ---------- */

.page-contact .contact-stage {
  position: relative;
  padding: 20px 0 64px;
  background: var(--deep-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 46px), 0 100%);
}

.page-contact .contact-stage::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(23, 224, 200, .16), rgba(23, 224, 200, 0) 68%);
  pointer-events: none;
}

.page-contact .contact-stage .crumbs__link,
.page-contact .contact-stage .crumbs__item {
  color: rgba(245, 250, 255, .70);
}

.page-contact .contact-stage .crumbs__link:hover {
  color: var(--neon);
}

.page-contact .contact-stage__grid {
  display: grid;
  gap: 34px;
  padding-top: 26px;
}

.page-contact .contact-stage__kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--neon);
}

.page-contact .contact-stage h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8.4vw, 3.35rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: #FFFFFF;
}

.page-contact .contact-stage__intro {
  margin: 20px 0 0;
  max-width: 40ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245, 250, 255, .80);
}

.page-contact .contact-stage__intro--sub {
  margin-top: 12px;
  font-size: .9375rem;
  color: rgba(245, 250, 255, .60);
}

/* 联系展牌 */

.page-contact .contact-board {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--shallow);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-2);
}

.page-contact .contact-board::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  z-index: 3;
  width: 3px;
  height: 100%;
  background: var(--neon);
}

.page-contact .contact-board::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(242, 237, 227, .42) 0%, var(--paper) 56%);
  pointer-events: none;
}

.page-contact .contact-board__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .55;
}

.page-contact .contact-board__panel {
  position: relative;
  z-index: 2;
  padding: 22px 20px 24px;
}

.page-contact .contact-board__kicker {
  margin: 0 0 4px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--deep-700);
  text-transform: uppercase;
}

.page-contact .contact-line {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 0;
  border-top: 1px solid var(--contact-line);
}

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

.page-contact .contact-line__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--gull);
}

.page-contact .contact-line__value {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.5;
  color: var(--deep-700);
  text-decoration: none;
  word-break: break-all;
}

.page-contact .contact-line__value--mail,
.page-contact .contact-line__value--tel {
  border-bottom: 1px solid rgba(22, 104, 179, .35);
}

.page-contact .contact-line__value--tel {
  font-size: 1.5rem;
  letter-spacing: .06em;
}

.page-contact .contact-line__value--addr {
  font-family: var(--font-body);
  font-size: 1rem;
  letter-spacing: .02em;
  word-break: normal;
}

.page-contact .contact-line__value:hover {
  color: var(--tide-500);
}

.page-contact .contact-board__note {
  margin: 14px 0 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--contact-soft);
}

/* ---------- 通用章节 ---------- */

.page-contact .section {
  padding: 54px 0;
}

.page-contact .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 5.6vw, 2.25rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.015em;
  max-width: 24ch;
}

.page-contact .section-title--tight {
  max-width: 16ch;
}

.page-contact .section-sub {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--contact-soft);
}

/* ---------- 三条合作路径 ---------- */

.page-contact .paths-band {
  margin: 26px 0 30px;
}

.page-contact .path-card {
  position: relative;
  border: 1px solid var(--shallow);
  border-radius: var(--radius);
  background: #FFFFFF;
  box-shadow: var(--shadow-1);
  transition: border-color .24s ease, box-shadow .24s ease, transform .24s ease;
}

.page-contact .path-card + .path-card {
  margin-top: 12px;
}

.page-contact .path-card:hover,
.page-contact .path-card[open] {
  border-color: var(--tide-500);
  box-shadow: var(--shadow-2);
}

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

.page-contact .path-card__summary {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 18px;
  cursor: pointer;
  list-style: none;
}

.page-contact .path-card__summary::-webkit-details-marker {
  display: none;
}

.page-contact .path-card__no {
  flex: 0 0 auto;
  margin-top: 2px;
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--coral);
}

.page-contact .path-card__main {
  display: block;
  flex: 1 1 auto;
}

.page-contact .path-card__title {
  display: block;
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-contact .path-card__desc {
  display: block;
  margin-top: 6px;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--contact-soft);
}

.page-contact .path-card__toggle {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 6px;
  color: var(--tide-500);
}

.page-contact .path-card__toggle::before,
.page-contact .path-card__toggle::after {
  content: "";
  position: absolute;
  background: currentColor;
}

.page-contact .path-card__toggle::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1px;
}

.page-contact .path-card__toggle::after {
  left: 7px;
  top: 0;
  width: 1px;
  height: 16px;
  transition: transform .24s ease;
}

.page-contact .path-card[open] .path-card__toggle::after {
  transform: scaleY(0);
}

.page-contact .path-card__body {
  margin: 0 18px 18px;
  padding-top: 14px;
  border-top: 1px solid var(--contact-line);
}

.page-contact .path-card__sub {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--gull);
}

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

.page-contact .path-card__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 6px;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--contact-soft);
}

.page-contact .path-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 1px;
  background: var(--tide-500);
}

.page-contact .path-card__tail {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--neon);
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--contact-soft);
}

.page-contact .paths-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  border: 1px solid var(--shallow);
  background: var(--shallow);
}

.page-contact .paths-stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 18px;
  background: var(--foam);
}

.page-contact .paths-stat__num {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--tide-500);
}

.page-contact .paths-stat__label {
  font-size: .875rem;
  color: var(--contact-soft);
}

/* ---------- 准备清单与处理流程 ---------- */

.page-contact .section--paper {
  background: var(--paper);
}

.page-contact .prep-grid {
  display: grid;
  gap: 40px;
}

.page-contact .check-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .check-list li {
  display: flex;
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--contact-line);
}

.page-contact .check-list li:first-child {
  border-top: 1px solid var(--contact-line);
}

.page-contact .check-list__box {
  flex: 0 0 auto;
  margin-top: 4px;
  color: var(--tide-500);
}

.page-contact .check-list__title {
  margin: 0;
  font-size: .9688rem;
  font-weight: 800;
  color: var(--ink);
}

.page-contact .check-list__text {
  margin: 6px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--contact-soft);
}

.page-contact .flow-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.page-contact .flow-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--shallow);
}

.page-contact .flow-list li {
  position: relative;
  padding: 0 0 26px 28px;
}

.page-contact .flow-list li:last-child {
  padding-bottom: 0;
}

.page-contact .flow-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  box-sizing: border-box;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--tide-500);
  background: var(--paper);
}

.page-contact .flow-list li:first-child::before {
  border-color: var(--neon);
  background: var(--neon);
}

.page-contact .flow-list__stage {
  margin: 0;
  font-size: .9688rem;
  font-weight: 800;
  color: var(--ink);
}

.page-contact .flow-list__text {
  margin: 6px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--contact-soft);
}

.page-contact .handling__link {
  margin: 20px 0 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--contact-soft);
}

.page-contact .handling__link a {
  color: var(--tide-500);
  border-bottom: 1px solid rgba(22, 104, 179, .35);
  text-decoration: none;
}

.page-contact .handling__link a:hover {
  border-bottom-color: var(--tide-500);
}

/* ---------- 使用问题与数据反馈 ---------- */

.page-contact .section--usage {
  background: var(--foam);
}

.page-contact .usage__lead {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--contact-soft);
}

.page-contact .usage-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .usage-item {
  padding: 18px 0;
  border-top: 1px solid var(--contact-line);
}

.page-contact .usage-item:last-child {
  border-bottom: 1px solid var(--contact-line);
}

.page-contact .usage-item__title {
  margin: 0;
  font-size: .9688rem;
  font-weight: 800;
  color: var(--ink);
}

.page-contact .usage-item__text {
  margin: 8px 0 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--contact-soft);
}

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

.page-contact .usage-actions .btn {
  text-decoration: none;
}

.page-contact .usage__note {
  margin: 14px 0 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--gull);
}

/* ---------- 常见合作问题 ---------- */

.page-contact .section--deep {
  background: var(--deep-900);
  color: var(--foam);
}

.page-contact .section--deep .section-title--light {
  color: #FFFFFF;
}

.page-contact .section-label--light {
  color: var(--neon);
}

.page-contact .faq-list {
  margin-top: 26px;
}

.page-contact .faq-item {
  border-top: 1px solid rgba(207, 228, 245, .22);
}

.page-contact .faq-item:last-child {
  border-bottom: 1px solid rgba(207, 228, 245, .22);
}

.page-contact .faq-item__summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-contact .faq-item__q {
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.6;
  color: #FFFFFF;
}

.page-contact .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 6px;
  color: var(--neon);
}

.page-contact .faq-item__mark::before,
.page-contact .faq-item__mark::after {
  content: "";
  position: absolute;
  background: currentColor;
}

.page-contact .faq-item__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1px;
}

.page-contact .faq-item__mark::after {
  left: 7px;
  top: 0;
  width: 1px;
  height: 16px;
  transition: transform .24s ease;
}

.page-contact .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
}

.page-contact .faq-item__body {
  padding: 0 0 20px;
}

.page-contact .faq-item__body p {
  margin: 0;
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.9;
  color: rgba(245, 250, 255, .76);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-contact .paths-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-contact .paths-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-contact .usage-actions {
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-stage {
    padding: 30px 0 96px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 72px), 0 100%);
  }

  .page-contact .contact-stage__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(340px, .82fr);
    gap: 56px;
    align-items: start;
    padding-top: 42px;
  }

  .page-contact .contact-board {
    margin-top: 18px;
  }

  .page-contact .section {
    padding: 88px 0;
  }

  .page-contact .prep-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  .page-contact .path-card__summary {
    padding: 22px 24px;
    gap: 20px;
  }

  .page-contact .path-card__body {
    margin: 0 24px 22px;
    padding-top: 16px;
  }

  .page-contact .path-card__title {
    font-size: 1.1875rem;
  }

  .page-contact .contact-line__value--tel {
    font-size: 1.75rem;
  }
}

@media (min-width: 1180px) {
  .page-contact .section-title {
    font-size: 2.375rem;
  }

  .page-contact .contact-stage h1 {
    max-width: 15ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .path-card,
  .page-contact .path-card__toggle::after,
  .page-contact .faq-item__mark::after {
    transition: none;
  }

  .page-contact .path-card:hover {
    transform: none;
  }
}