.page-faq {
  --faq-rule: rgba(201, 210, 220, .2);
  --faq-rule-strong: rgba(201, 210, 220, .42);
  --faq-body: rgba(244, 246, 241, .8);
  --faq-body-strong: rgba(244, 246, 241, .92);
  background: var(--ink);
  padding-bottom: 84px;
}

/* ---------- 页头 ---------- */
.page-faq .page-head {
  padding-top: 26px;
  padding-bottom: 0;
}

.page-faq .page-head__eyebrow {
  color: var(--lime);
}

.page-faq .page-head__title {
  max-width: 15em;
}

.page-faq .page-head__lead {
  max-width: 46em;
  color: var(--faq-body);
  margin-top: 16px;
}

/* ---------- 顶部快捷条 ---------- */
.page-faq .faq-quickbar {
  margin-top: 30px;
  border-top: 1px solid var(--track-line);
  border-bottom: 1px solid var(--track-line);
  background: linear-gradient(180deg, rgba(20, 49, 90, .5), rgba(5, 13, 24, .72));
}

.page-faq .faq-quickbar__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  overflow: hidden;
}

.page-faq .faq-quickbar__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--lime);
  padding: 14px 14px 14px 0;
  border-right: 1px solid var(--track-line);
  text-transform: uppercase;
}

.page-faq .faq-quickbar__track {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding: 11px 2px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-quickbar__track::-webkit-scrollbar {
  height: 4px;
}

.page-faq .faq-quickbar__track::-webkit-scrollbar-thumb {
  background: var(--track-line);
  border-radius: 2px;
}

.page-faq .faq-quickbar__chip {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--track-line);
  background: rgba(5, 13, 24, .55);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  border-radius: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-quickbar__chip:hover,
.page-faq .faq-quickbar__chip:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(216, 255, 62, .08);
}

/* ---------- 主体网格 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  min-width: 0;
}

/* ---------- 左侧分类索引 ---------- */
.page-faq .faq-index {
  border-top: 2px solid var(--lime);
  padding-top: 14px;
  min-width: 0;
}

.page-faq .faq-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px 8px 8px;
  border-left: 2px solid transparent;
  color: var(--paper);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  border-left-color: var(--lime);
  background: rgba(216, 255, 62, .08);
  color: var(--lime);
}

.page-faq .faq-index__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 分组 ---------- */
.page-faq .faq-groups {
  display: grid;
  gap: 60px;
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
  min-width: 0;
}

.page-faq .faq-group__head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--track-line);
}

.page-faq .faq-group__head::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 58px;
  height: 2px;
  background: var(--lime);
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--muted);
}

.page-faq .faq-group__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.7vw, 27px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group__count {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
  white-space: nowrap;
}

.page-faq .faq-group__items {
  margin-top: 2px;
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 6px 16px 0;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.45;
  letter-spacing: 0;
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 13px;
  height: 13px;
  margin-top: 6px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: '';
  position: absolute;
  background: var(--lime);
  transition: transform 160ms var(--ease), opacity 160ms var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 5.5px;
  width: 13px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  left: 5.5px;
  top: 0;
  width: 2px;
  height: 13px;
}

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

.page-faq .faq-item__a {
  margin-left: 1px;
  padding: 0 0 20px 0;
  border-left: 2px solid transparent;
  transition: border-color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-faq .faq-item[open] > .faq-item__a {
  border-left-color: var(--coral);
  padding-left: 18px;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  max-width: 800px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--faq-body);
  overflow-wrap: break-word;
}

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

/* ---------- 答案内的高亮与跳转 ---------- */
.page-faq .hl {
  background: var(--lime);
  color: var(--night);
  padding: 0 4px;
  border-radius: 2px;
  font-weight: 600;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.page-faq .faq-jump {
  display: inline-block;
  margin: 0 2px;
  padding: 0 1px;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  text-decoration: none;
  border-bottom: 1px solid var(--lime);
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-jump:hover,
.page-faq .faq-jump:focus-visible {
  background: var(--lime);
  color: var(--night);
}

/* ---------- 图示 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 6px;
  min-width: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border: 1px solid var(--track-line);
  background: var(--night);
}

.page-faq .faq-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.65;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-faq .faq-figure--square {
  margin: 20px 0 0;
}

.page-faq .faq-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  min-width: 0;
}

/* ---------- 收尾区块 ---------- */
.page-faq .faq-group--help {
  padding-top: 4px;
}

.page-faq .faq-help {
  margin-top: 30px;
  padding: 26px 22px;
  background: linear-gradient(135deg, var(--track), rgba(11, 27, 51, .9));
  border-left: 4px solid var(--coral);
}

.page-faq .faq-help__text {
  margin: 0 0 18px;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--faq-body-strong);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-group__head {
    gap: 16px;
  }

  .page-faq .faq-item summary {
    font-size: 18px;
    padding-top: 18px;
    padding-bottom: 18px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 34px;
    align-items: start;
  }

  .page-faq .faq-figure--square {
    margin-top: 6px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 52px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }

  .page-faq .faq-figure--wide {
    margin-top: 24px;
  }
}

@media (max-width: 640px) {
  .page-faq .faq-quickbar__label {
    display: none;
  }

  .page-faq {
    padding-bottom: 60px;
  }

  .page-faq .faq-groups {
    gap: 46px;
  }

  .page-faq .faq-item__a {
    padding-bottom: 18px;
  }

  .page-faq .faq-item[open] > .faq-item__a {
    padding-left: 14px;
  }

  .page-faq .faq-help {
    padding: 22px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-item__a,
  .page-faq .faq-item summary,
  .page-faq .faq-index__list a,
  .page-faq .faq-quickbar__chip,
  .page-faq .faq-jump {
    transition: none;
  }
}