.page-faq {
  --faq-rail-w: 268px;
  --faq-indent: 58px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: 0;
  overflow: hidden;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
  margin-top: clamp(20px, 3vw, 36px);
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-size: clamp(32px, 7vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  max-width: 15em;
}

.page-faq .faq-hero__main .lede {
  margin-top: clamp(16px, 2vw, 24px);
  max-width: 40em;
}

.page-faq .faq-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-faq .faq-hero__panel .panel {
  border-top: 2px solid var(--signal-400);
}

.page-faq .faq-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .faq-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 10px;
  border-left: 1px solid var(--line-700);
}

.page-faq .faq-metric__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--signal-400);
}

.page-faq .faq-metric__num--amber {
  color: var(--round-500);
}

.page-faq .faq-metric__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--index-600);
}

.page-faq .faq-hero__hint {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-700);
  font-size: 14px;
  line-height: 1.75;
  color: var(--index-600);
}

.page-faq .faq-scale {
  height: 44px;
  margin-top: clamp(28px, 5vw, 54px);
  border-top: 1px solid var(--line-700);
  background-image: repeating-linear-gradient(
    90deg,
    var(--line-700) 0 1px,
    transparent 1px 40px
  );
  background-size: 100% 14px;
  background-position: 0 0;
  background-repeat: repeat-x;
  opacity: 0.9;
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
  .page-faq .faq-hero__panel {
    margin-top: clamp(24px, 4vw, 62px);
  }
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index__head {
  max-width: 46em;
}

.page-faq .faq-index__head .body-text {
  margin-top: 14px;
}

.page-faq .faq-catbar {
  display: flex;
  margin-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line-700);
  border-bottom: 1px solid var(--line-700);
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-catbar__item {
  flex: 1 0 auto;
  min-width: 156px;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 8px;
  row-gap: 4px;
  align-items: center;
  padding: 13px 16px 15px;
  border-right: 1px solid var(--line-700);
  color: var(--mist-200);
  text-decoration: none;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.page-faq .faq-catbar__item:last-child {
  border-right: 0;
}

.page-faq .faq-catbar__num {
  grid-row: 1;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--index-600);
}

.page-faq .faq-catbar__name {
  grid-row: 1;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-faq .faq-catbar__count {
  grid-row: 2;
  grid-column: 1 / -1;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--round-500);
}

.page-faq .faq-catbar__item:hover,
.page-faq .faq-catbar__item:focus-visible {
  background: var(--layer-800);
  color: var(--archive-050);
  box-shadow: inset 0 -2px 0 var(--signal-400);
  outline: none;
}

.page-faq .faq-catbar__item:focus-visible {
  box-shadow: inset 0 -2px 0 var(--signal-400), inset 0 0 0 2px var(--focus-300);
}

.page-faq .faq-index__fig {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

/* ---------- 双栏问答 ---------- */
.page-faq .faq-body {
  padding-top: clamp(34px, 5vw, 64px);
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 60px);
  align-items: start;
}

.page-faq .faq-rail {
  display: none;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--index-600);
}

.page-faq .faq-rail__group + .faq-rail__group {
  margin-top: 18px;
}

.page-faq .faq-rail__cat {
  margin: 0 0 6px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-700);
}

.page-faq .faq-rail__cat a {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--round-500);
  text-decoration: none;
}

.page-faq .faq-rail__cat a:hover,
.page-faq .faq-rail__cat a:focus-visible {
  color: var(--archive-050);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-rail__link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 6px;
  padding: 5px 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist-200);
  text-decoration: none;
  border-left: 1px solid transparent;
  padding-left: 6px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-rail__link .num {
  color: var(--index-600);
  font-size: 11px;
  padding-top: 3px;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--archive-050);
  border-left-color: var(--signal-400);
  outline: none;
}

.page-faq .faq-rail__link:hover .num,
.page-faq .faq-rail__link:focus-visible .num {
  color: var(--signal-400);
}

@media (min-width: 1024px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  }
  .page-faq .faq-rail {
    display: block;
    position: sticky;
    top: calc(var(--head-h) + 26px);
    max-height: calc(100vh - var(--head-h) - 56px);
    overflow-y: auto;
    padding-right: 12px;
    border-top: 1px solid var(--signal-400);
    padding-top: 14px;
    scrollbar-width: thin;
  }
}

/* ---------- 分组与折叠条目 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(38px, 6vw, 68px);
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  margin-bottom: 4px;
  border-bottom: 2px solid var(--signal-400);
}

.page-faq .faq-group:nth-of-type(even) .faq-group__head {
  border-bottom-color: var(--round-500);
}

.page-faq .faq-group__head .h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  font-family: var(--font-display);
}

.page-faq .faq-group__count {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--index-600);
  white-space: nowrap;
}

.page-faq .qa {
  border-bottom: 1px solid var(--line-700);
  scroll-margin-top: calc(var(--head-h) + 24px);
}

.page-faq .qa__q {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 14px 30px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 15px 4px 15px 0;
  font-size: clamp(15px, 2vw, 17px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--archive-050);
  transition: color 0.18s var(--ease);
}

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

.page-faq .qa__q:hover .qa__text,
.page-faq .qa__q:focus-visible .qa__text {
  color: var(--signal-400);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--focus-300);
  outline-offset: 2px;
}

.page-faq .qa__mark {
  width: 11px;
  height: 11px;
  margin-top: 7px;
  border: 1px solid var(--index-600);
  background: transparent;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .qa[open] .qa__mark {
  background: var(--signal-400);
  border-color: var(--signal-400);
}

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--index-600);
  padding-top: 5px;
}

.page-faq .qa[open] .qa__num {
  color: var(--round-500);
}

.page-faq .qa__a {
  padding: 0 8px 20px var(--faq-indent);
  max-width: 60em;
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist-200);
}

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

.page-faq .qa__a a {
  color: var(--signal-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__a a:hover,
.page-faq .qa__a a:focus-visible {
  color: var(--focus-300);
}

.page-faq .qa__note {
  padding-left: 10px;
  border-left: 1px solid var(--line-700);
  font-size: 13.5px !important;
  color: var(--index-600) !important;
}

@media (max-width: 560px) {
  .page-faq {
    --faq-indent: 24px;
  }
  .page-faq .qa__q {
    grid-template-columns: 12px 24px minmax(0, 1fr);
    gap: 8px;
  }
  .page-faq .faq-metric {
    padding-left: 8px;
  }
}

.page-faq .faq-shot {
  margin: 18px 0 0;
  max-width: 640px;
}

/* ---------- 收束 ---------- */
.page-faq .faq-end {
  border-top: 1px solid var(--line-700);
  margin-top: clamp(30px, 5vw, 60px);
}

.page-faq .faq-end__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  align-items: start;
}

.page-faq .faq-end__line {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.45;
  max-width: 26em;
}

.page-faq .faq-end__sub {
  margin: 12px 0 0;
  color: var(--index-600);
}

.page-faq .faq-end__sub a {
  color: var(--signal-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-end__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

@media (min-width: 900px) {
  .page-faq .faq-end__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(24px, 4vw, 56px);
    row-gap: 22px;
  }
  .page-faq .faq-end__actions {
    justify-content: flex-end;
    padding-top: 6px;
  }
  .page-faq .faq-end__note {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-catbar__item,
  .page-faq .qa__mark,
  .page-faq .qa__num,
  .page-faq .qa__q,
  .page-faq .qa__text,
  .page-faq .faq-rail__link {
    transition: none;
  }
}
<<<END>>>