/* =========================================================
   常见问题页 · 分组手风琴
   作用域：.page-faq
   ========================================================= */

.page-faq {
  --faq-gap: clamp(24px, 4.5vw, 56px);
  --faq-rule: 8px;
  display: block;
  background-color: var(--deep);
  color: var(--mist);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-top {
  padding-top: var(--sp-5);
  padding-bottom: var(--sp-3);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--line);
  background:
    radial-gradient(120% 88% at 84% -12%, var(--cyan-12), transparent 62%),
    linear-gradient(180deg, transparent, rgba(7, 12, 24, .55));
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .5;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 76%);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(36px, 7vw, 80px) clamp(20px, 3.5vw, 36px);
}

.page-faq .faq-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  margin: 0 0 var(--sp-3);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
  white-space: nowrap;
}

.page-faq .faq-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0 0 var(--sp-3);
  max-width: 20em;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-hero__media {
  position: relative;
  z-index: 1;
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-faq .faq-banner {
  margin: 0;
  border: var(--line);
  background: var(--navy);
  overflow: hidden;
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 分组跳转条 ---------- */
.page-faq .faq-jump {
  position: sticky;
  top: 56px;
  z-index: 20;
  border-bottom: var(--line);
  background: rgba(7, 12, 24, .94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.page-faq .faq-jump__list {
  display: flex;
  align-items: stretch;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.page-faq .faq-jump__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-jump__item {
  flex: 0 0 auto;
  border-right: var(--line);
}

.page-faq .faq-jump__item:first-child {
  border-left: var(--line);
}

.page-faq .faq-jump__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 18px;
  font-size: var(--fs-sm);
  letter-spacing: .02em;
  color: var(--grey);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  color: var(--cyan);
  background: var(--cyan-12);
  outline: none;
}

.page-faq .faq-jump__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--grey);
  opacity: .72;
  transition: color .18s var(--ease), opacity .18s var(--ease);
}

.page-faq .faq-jump__link:hover .faq-jump__idx,
.page-faq .faq-jump__link:focus-visible .faq-jump__idx {
  color: var(--cyan);
  opacity: 1;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-block: clamp(40px, 6vw, 72px);
  scroll-margin-top: 120px;
}

.page-faq .faq-group + .faq-group {
  position: relative;
  border-top: 1px solid var(--grid);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 8px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--grid) 0,
    var(--grid) 1px,
    transparent 1px,
    transparent 8px
  );
  pointer-events: none;
}

.page-faq .faq-group__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
}

.page-faq .faq-group__rail {
  position: relative;
  padding-left: 20px;
}

.page-faq .faq-group__rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background-image: repeating-linear-gradient(
    180deg,
    var(--grid) 0,
    var(--grid) 1px,
    transparent 1px,
    transparent 8px
  );
}

.page-faq .faq-group__no {
  display: block;
  margin-bottom: var(--sp-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0 0 var(--sp-2);
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.28;
  font-weight: 900;
  letter-spacing: -.005em;
  color: var(--white);
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 26em;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--grey);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-group__list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--grid);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--grid);
  -webkit-tap-highlight-color: transparent;
  transition: background-color .2s var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--navy);
}

.page-faq .faq-item__q {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) 16px;
  align-items: start;
  gap: 8px;
  padding: 17px 12px 17px 14px;
  cursor: pointer;
  list-style: none;
  color: var(--mist);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  background: var(--cyan-12);
  outline: none;
}

.page-faq .faq-item[open] .faq-item__q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: var(--cyan);
}

.page-faq .faq-item__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  text-align: right;
  letter-spacing: .04em;
  color: var(--grey);
  transition: color .18s var(--ease);
}

.page-faq .faq-item[open] .faq-item__idx {
  color: var(--cyan);
}

.page-faq .faq-item__text {
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  letter-spacing: .005em;
  color: var(--mist);
}

.page-faq .faq-item[open] .faq-item__text {
  color: var(--white);
}

.page-faq .faq-item__mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  justify-self: end;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--grey);
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 6.25px;
  width: 14px;
  height: 1.5px;
}

.page-faq .faq-item__mark::after {
  left: 6.25px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

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

.page-faq .faq-item[open] .faq-item__mark::before {
  background: var(--cyan);
}

.page-faq .faq-item__a {
  padding: 0 12px 20px 46px;
}

.page-faq .faq-item[open] .faq-item__a {
  animation: faq-answer-in .28s var(--ease) both;
}

@keyframes faq-answer-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-item__a p + p {
  margin-top: var(--sp-3);
}

.page-faq .faq-item__links {
  font-size: 14px;
}

.page-faq .faq-item__links a {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-24);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-faq .faq-item__links a:hover,
.page-faq .faq-item__links a:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- 流程说明图 ---------- */
.page-faq .faq-flow {
  margin: var(--sp-5) 0 0;
}

.page-faq .faq-flow .figure__frame {
  border: var(--line);
  background: var(--deep);
  overflow: hidden;
}

.page-faq .faq-flow img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 底部联系带 ---------- */
.page-faq .faq-cta {
  border-top: 1px solid var(--grid);
  background:
    linear-gradient(180deg, var(--cyan-12), transparent 72%),
    var(--deep);
}

.page-faq .faq-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  padding-block: clamp(40px, 6vw, 72px);
}

.page-faq .faq-cta__kicker {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-cta__title {
  margin: 0 0 var(--sp-2);
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -.005em;
  color: var(--white);
}

.page-faq .faq-cta__note {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--grey);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  align-items: flex-start;
}

/* ---------- 断点：小屏调整 ---------- */
@media (max-width: 599px) {
  .page-faq .faq-item__q {
    grid-template-columns: 22px minmax(0, 1fr) 14px;
    gap: 8px;
    padding: 16px 10px 16px 12px;
  }

  .page-faq .faq-item__a {
    padding: 0 10px 18px 42px;
  }

  .page-faq .faq-item__mark {
    width: 12px;
    height: 12px;
  }

  .page-faq .faq-item__mark::before {
    width: 12px;
    top: 5.25px;
  }

  .page-faq .faq-item__mark::after {
    height: 12px;
    left: 5.25px;
  }

  .page-faq .faq-jump__link {
    padding: 13px 14px;
  }

  .page-faq .faq-cta__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

/* ---------- 断点：桌面非对称分栏 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-group__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-faq .faq-group__rail {
    position: sticky;
    top: 124px;
    padding-left: 24px;
  }

  .page-faq .faq-item__q {
    grid-template-columns: 34px minmax(0, 1fr) 18px;
    gap: 12px;
    padding: 20px 16px 20px 18px;
  }

  .page-faq .faq-item__a {
    padding: 0 16px 24px 64px;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: var(--sp-6);
    align-items: end;
  }

  .page-faq .faq-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__title {
    max-width: 16em;
  }
}

/* ---------- 无障碍：降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-item__idx,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-jump__link,
  .page-faq .faq-jump__idx,
  .page-faq .faq-item__links a {
    transition: none;
  }

  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }
}