.page-faq {
  --faq-rail: 212px;
  --faq-sticky: 104px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-mast {
  position: relative;
  padding: clamp(22px, 4.5vw, 54px) 0 clamp(20px, 3.5vw, 40px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 92% at 88% -12%, rgba(52, 226, 210, .12), transparent 62%),
    linear-gradient(180deg, var(--hull) 0%, rgba(6, 23, 38, .15) 100%);
}

.page-faq .faq-mast::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--orange) 0%, rgba(255, 106, 31, 0) 48%);
}

.page-faq .faq-mast__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(14px, 2vw, 22px);
}

.page-faq .faq-mast__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(29px, 5.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--cool);
  margin: 14px 0 0;
}

.page-faq .faq-mast__title em {
  font-style: normal;
  color: var(--orange);
}

.page-faq .faq-mast__lede {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--dim);
}

.page-faq .faq-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-faq .faq-metric {
  padding: 14px 14px 16px;
  background: rgba(6, 23, 38, .78);
}

.page-faq .faq-metric__value {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cool);
}

.page-faq .faq-metric__value span {
  margin-left: 4px;
  font-size: .48em;
  letter-spacing: 0;
  color: var(--steel);
}

.page-faq .faq-metric__label {
  display: block;
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--dim-2);
}

.page-faq .faq-mast__media {
  margin: 0;
  align-self: end;
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-toolbar {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-faq .faq-toolbar .filter-bar {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 84px);
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--dim-2);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--dim);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--orange);
  color: var(--cool);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 116px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(36px, 5vw, 66px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--line-strong);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-faq .faq-group__title {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.28;
  color: var(--cool);
}

.page-faq .faq-group__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--dim-2);
  white-space: nowrap;
}

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

.page-faq .faq-item[hidden] {
  display: none;
}

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

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 20px;
  gap: 10px;
  align-items: start;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.55;
  color: var(--cool);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-faq .faq-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2.1;
  color: var(--steel);
  transition: color .18s var(--ease);
}

.page-faq .faq-item__q:hover .faq-item__no,
.page-faq .faq-item__details[open] .faq-item__no {
  color: var(--orange);
}

.page-faq .faq-item__chev {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 6px;
}

.page-faq .faq-item__chev::before,
.page-faq .faq-item__chev::after {
  content: "";
  position: absolute;
  background: var(--steel);
  transition: transform .22s var(--ease), opacity .22s var(--ease), background .22s var(--ease);
}

.page-faq .faq-item__chev::before {
  left: 50%;
  top: 0;
  width: 1px;
  height: 16px;
  transform: translateX(-50%);
}

.page-faq .faq-item__chev::after {
  top: 50%;
  left: 0;
  width: 16px;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .faq-item__details[open] .faq-item__chev::before {
  opacity: 0;
}

.page-faq .faq-item__details[open] .faq-item__chev::after {
  background: var(--orange);
}

.page-faq .faq-item__a {
  margin: 0 0 20px 34px;
  padding: 15px 18px 16px;
  border-left: 2px solid var(--orange);
  background: linear-gradient(180deg, rgba(12, 36, 55, .95), rgba(12, 36, 55, .5));
  color: var(--dim);
  font-size: 15px;
  line-height: 1.8;
}

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

.page-faq .faq-item__a p + p {
  margin-top: 10px;
}

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 226, 210, .45);
}

.page-faq .faq-item__a a:hover {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-k {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .96em;
  letter-spacing: .01em;
  color: var(--orange);
}

.page-faq .faq-k--cyan {
  color: var(--cyan);
}

/* ---------- 时间刻度带 ---------- */
.page-faq .faq-band {
  display: grid;
  gap: 16px;
  margin: 22px 0 10px;
  padding: 16px;
  border: 1px solid var(--line);
  background: rgba(8, 26, 43, .62);
}

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

.page-faq .faq-band__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-faq .faq-band__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(6, 23, 38, .88);
  font-size: 14px;
  color: var(--dim);
}

.page-faq .faq-band__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

.page-faq .faq-band__name {
  color: var(--cool);
  font-weight: 600;
}

.page-faq .faq-band__time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- 底部协助 ---------- */
.page-faq .faq-help {
  display: grid;
  gap: 18px;
  margin-top: clamp(40px, 6vw, 76px);
  padding: clamp(22px, 3.4vw, 36px);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(120deg, rgba(255, 106, 31, .10), rgba(6, 23, 38, 0) 58%),
    var(--hull);
}

.page-faq .faq-help__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.3;
  color: var(--cool);
}

.page-faq .faq-help__text {
  max-width: 62ch;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim);
}

.page-faq .faq-help__channels {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--dim);
}

.page-faq .faq-help__channels li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-faq .faq-help__channels .mono {
  color: var(--steel);
  font-size: 12px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 860px) {
  .page-faq .faq-band {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-faq .faq-band__list {
    align-content: start;
  }

  .page-faq .faq-item__a {
    margin-left: 44px;
    padding: 18px 22px 20px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-mast__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky);
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 10px 10px 10px 14px;
    white-space: normal;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-left-color: var(--orange);
    background: rgba(255, 106, 31, .07);
    color: var(--cool);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-item__q {
    grid-template-columns: 46px minmax(0, 1fr) 22px;
    gap: 14px;
  }

  .page-faq .faq-item__a {
    margin-left: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__chev::before,
  .page-faq .faq-item__chev::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-item__no {
    transition: none;
  }
}