.page-faq {
  --faq-col-gap: clamp(1.5rem, 3.5vw, 3.5rem);
  --faq-block: clamp(2rem, 5vw, 3.5rem);
  background-color: var(--ink);
  color: var(--ivory);
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(1.25rem, 3vw, 2.25rem) clamp(2rem, 5vw, 3.5rem);
}

.page-faq .faq-hero .crumbs {
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}

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

.page-faq .faq-kicker {
  color: var(--cyan);
  margin: 0;
}

.page-faq .faq-hero__title {
  margin: 0.7rem 0 1.1rem;
  max-width: 16ch;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 56ch;
  color: var(--ivory);
  line-height: 1.8;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2.25rem;
  margin: 2rem 0 0;
  padding: 1.15rem 0 0;
  border-top: var(--line);
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-faq .faq-hero__meta .num {
  color: var(--cyan);
  font-size: 1.0625rem;
  margin-right: 0.5rem;
}

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

.page-faq .faq-hero__media {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: var(--line);
  background-color: var(--ink-2);
}

.page-faq .faq-hero__media img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.72) contrast(1.06) brightness(0.92);
}

.page-faq .media-frame__caption {
  margin-top: 0.7rem;
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 双栏阅读区 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-col-gap);
}

.page-faq .faq-stream {
  min-width: 0;
}

/* 主题索引 */
.page-faq .topic-index {
  border-top: 1px solid var(--grid);
  padding-top: 1rem;
}

.page-faq .topic-index__title {
  margin: 0 0 0.4rem;
}

.page-faq .topic-index__note {
  margin: 0 0 1.25rem;
  font-size: 0.8125rem;
  line-height: 1.7;
}

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

.page-faq .topic-index__item + .topic-index__item {
  border-top: 1px solid var(--grid);
}

.page-faq .topic-index__link {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 0.65rem;
  row-gap: 0.2rem;
  padding: 0.75rem 0.5rem 0.75rem 0.85rem;
  border-left: 2px solid var(--grid);
  text-decoration: none;
  color: var(--ivory);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-faq .topic-index__link:hover,
.page-faq .topic-index__link:focus-visible {
  border-left-color: var(--orange);
  background-color: var(--ink-2);
}

.page-faq .topic-index__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding-top: 0.18rem;
}

.page-faq .topic-index__label {
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1.4;
}

.page-faq .topic-index__sub {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .topic-index__foot {
  margin: 1.5rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--grid);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .flink {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--teal);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 条目组 ---------- */
.page-faq .qa-group {
  padding-top: clamp(1.5rem, 3.5vw, 2.5rem);
  border-top: 1px solid var(--grid);
}

.page-faq .qa-group + .qa-group {
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.page-faq .qa-group__head {
  margin-bottom: 1.25rem;
}

.page-faq .qa-group__num {
  margin: 0 0 0.55rem;
  color: var(--orange);
}

.page-faq .qa-group__title {
  margin: 0 0 0.6rem;
  max-width: 26ch;
}

.page-faq .qa-group__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* 问答条目 */
.page-faq .qa {
  border-top: 1px solid var(--grid);
}

.page-faq .qa-group__head + .qa {
  border-top-color: var(--grid);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.95rem 0;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.65;
  color: var(--ivory);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1.125rem;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .qa[open] .qa__q::after {
  content: "–";
  color: var(--orange);
}

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

.page-faq .qa__no {
  flex: none;
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  font-weight: 400;
  color: var(--muted);
}

.page-faq .qa__a {
  padding: 0 2.5rem 1.2rem 2.3rem;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 配图与图示 ---------- */
.page-faq .faq-figure {
  margin: 0 0 1.5rem;
}

.page-faq .faq-figure__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: var(--line);
  background-color: var(--ink-2);
}

.page-faq .faq-figure__frame img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.7) contrast(1.05) brightness(0.9);
}

.page-faq .range-figure {
  margin: 1.75rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--grid);
}

.page-faq .range-figure__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-faq .rf-axis,
.page-faq .rf-tick {
  stroke: var(--grid);
  stroke-width: 1;
}

.page-faq .rf-track {
  fill: var(--ink-2);
}

.page-faq .rf-span {
  fill: var(--teal);
  opacity: 0.55;
}

.page-faq .rf-peak {
  fill: var(--cyan);
  opacity: 0.38;
}

.page-faq .rf-node {
  fill: var(--orange);
}

.page-faq .rf-guide {
  stroke: var(--orange);
  stroke-width: 1;
  stroke-dasharray: 4 4;
  opacity: 0.65;
}

.page-faq .rf-label,
.page-faq .rf-note {
  font-family: var(--font-mono);
  text-anchor: middle;
}

.page-faq .rf-label {
  fill: var(--muted);
  font-size: 13px;
}

.page-faq .rf-note {
  fill: var(--orange);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 求助与更正 ---------- */
.page-faq .faq-help {
  padding-block: clamp(2rem, 5vw, 3.5rem);
}

.page-faq .faq-help__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-faq .faq-help__kicker {
  margin: 0 0 0.6rem;
  color: var(--cyan);
}

.page-faq .faq-help__title {
  margin: 0 0 0.9rem;
  max-width: 22ch;
}

.page-faq .faq-help__text {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--muted);
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--grid);
}

.page-faq .faq-help__item {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--grid);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--ivory);
}

.page-faq .faq-help__item .num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-faq .faq-help__contact {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 1rem 1.15rem;
  background-color: var(--orange-deep);
  border-left: 3px solid var(--orange);
  font-size: 0.8125rem;
  line-height: 1.8;
  color: var(--ivory);
}

.page-faq .faq-help__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero__meta {
    gap: 1rem 2.75rem;
  }

  .page-faq .qa__q {
    font-size: 1.0625rem;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-faq .faq-hero__title {
    max-width: 14ch;
  }

  .page-faq .faq-help__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-faq .faq-help__list {
    margin-top: 0.4rem;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  }

  .page-faq .faq-side {
    position: sticky;
    top: 1.75rem;
    align-self: start;
  }

  .page-faq .topic-index {
    max-width: 22rem;
  }

  .page-faq .qa__a {
    padding-left: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .topic-index__link,
  .page-faq .qa__q,
  .page-faq .flink {
    transition: none;
  }
}