.page-faq {
  --faq-rail: 236px;
  --faq-line: rgba(195, 208, 218, .16);
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

.page-faq img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-faq .num {
  font-family: var(--font-num);
  letter-spacing: .08em;
}

/* ---------- 首屏 ---------- */
.page-faq .crumbs {
  padding-top: 24px;
  font-size: 13px;
  color: var(--text-mute);
}
.page-faq .crumbs a {
  color: var(--text-dim);
  text-decoration: none;
}
.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--cyan);
}

.page-faq .faq-hero {
  padding-top: 20px;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 28px;
  align-items: end;
  padding-bottom: 36px;
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 1.14;
  letter-spacing: .01em;
}

.page-faq .faq-hero__lede {
  max-width: 44ch;
  margin-top: 18px;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.78;
}

.page-faq .faq-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__figure {
  margin: 0;
}

.page-faq .faq-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 8px;
  background: var(--faq-line);
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-strip .strip__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  background: var(--ink);
}

.page-faq .faq-strip .strip__key {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--text-mute);
}

.page-faq .faq-strip .strip__val {
  font-size: 15px;
  color: var(--text);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 36px;
  padding-block: 48px 72px;
}

/* 左侧分类刻度 */
.page-faq .faq-side__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--text-mute);
}

.page-faq .faq-side__list {
  display: flex;
  gap: 6px;
  margin: 14px 0 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-side__list > li {
  flex: 0 0 auto;
}

.page-faq .faq-side__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-left: 2px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .faq-side__link:hover,
.page-faq .faq-side__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(47, 211, 232, .07);
}

.page-faq .faq-side__idx {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--rock);
}

.page-faq .faq-side__link:hover .faq-side__idx,
.page-faq .faq-side__link:focus-visible .faq-side__idx {
  color: var(--cyan);
}

.page-faq .faq-side__meta {
  display: none;
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--faq-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-faq .faq-side__meta a {
  color: var(--cyan);
  text-decoration: none;
}

/* 右侧问答 */
.page-faq .faq-group {
  margin-bottom: 52px;
  scroll-margin-top: 110px;
}

.page-faq .faq-group:last-of-type {
  margin-bottom: 24px;
}

.page-faq .faq-group__head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-group__idx {
  flex: 0 0 auto;
  padding-top: 7px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 3.2vw, 29px);
  line-height: 1.3;
}

.page-faq .faq-group__note {
  max-width: 50ch;
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-mute);
}

/* 折叠条目 */
.page-faq .faq-item {
  position: relative;
  padding-left: 0;
  border-bottom: 1px solid var(--faq-line);
  transition: padding-left .28s var(--ease), background-color .28s var(--ease);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--cyan);
  transition: width .28s var(--ease);
}

.page-faq .faq-item[open] {
  padding-left: 18px;
  background: linear-gradient(90deg, rgba(47, 211, 232, .06), rgba(47, 211, 232, 0) 62%);
}

.page-faq .faq-item[open]::before {
  width: 3px;
}

.page-faq .faq-item summary {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 17px 0;
  cursor: pointer;
  list-style: none;
  color: var(--text);
}

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

.page-faq .faq-item summary::marker {
  content: "";
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.6;
  transition: color .25s var(--ease);
}

.page-faq .faq-item summary:hover .faq-item__q {
  color: var(--cyan);
}

.page-faq .faq-item[open] .faq-item__q {
  color: #FFFFFF;
}

.page-faq .faq-item__sign {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-top: 7px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .28s var(--ease), opacity .28s var(--ease);
}

.page-faq .faq-item__sign::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1.5px;
}

.page-faq .faq-item__sign::after {
  left: 7px;
  top: 0;
  width: 1.5px;
  height: 16px;
}

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

.page-faq .faq-item__body {
  padding: 0 32px 20px 0;
  color: var(--text-dim);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
}

.page-faq .faq-item__body p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 211, 232, .4);
}

.page-faq .faq-item__body a:hover,
.page-faq .faq-item__body a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-outro {
  margin-top: 20px;
  padding-top: 44px;
  border-top: 1px solid var(--line-strong);
}

.page-faq .faq-outro__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-faq .faq-outro h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 33px);
  line-height: 1.25;
}

.page-faq .faq-outro__text {
  max-width: 46ch;
  margin: 14px 0 0;
  color: var(--text-dim);
  font-size: 15.5px;
  line-height: 1.78;
}

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

.page-faq .faq-outro__meta {
  display: grid;
  gap: 8px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--faq-line);
  list-style: none;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-faq .faq-outro__meta strong {
  margin-right: 8px;
  font-weight: 500;
  color: var(--text-dim);
}

.page-faq .faq-outro figure {
  margin: 0;
}

/* ---------- 返回顶部 ---------- */
.page-faq .to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 40;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(10, 26, 42, .92);
  color: var(--cyan);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), border-color .3s var(--ease);
}

.page-faq .to-top[data-visible] {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.page-faq .to-top:hover,
.page-faq .to-top:focus-visible {
  border-color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 44px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 60px;
    padding-block: 56px 88px;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-faq .faq-side__list {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-side__link {
    padding: 11px 12px;
  }

  .page-faq .faq-side__meta {
    display: block;
  }

  .page-faq .faq-outro__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    gap: 52px;
  }

  .page-faq .to-top {
    right: 32px;
    bottom: 32px;
  }
}

@media (min-width: 1440px) {
  .page-faq {
    --faq-rail: 268px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item::before,
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-item__q,
  .page-faq .faq-side__link,
  .page-faq .to-top {
    transition-duration: .01ms;
  }

  .page-faq .to-top {
    transform: none;
  }
}