.page-faq {
  --faq-nav-w: 216px;
  --faq-gap: 56px;
}

/* ---------- 面包屑与首屏 ---------- */
.page-faq .breadcrumb {
  padding-block-start: 28px;
}

.page-faq .faq-hero {
  padding-block: 36px 52px;
  border-bottom: 1px solid var(--line-faint);
}

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--text-2);
}

.page-faq .faq-hero__meta {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  border-top: 1px solid var(--line-faint);
  padding-block-start: 24px;
}

.page-faq .faq-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-faq .faq-hero__num {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-hero__cap {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

/* ---------- 双栏骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-block: 44px 100px;
}

/* ---------- 左侧分类导航 ---------- */
.page-faq .faq-nav {
  min-width: 0;
}

.page-faq .faq-nav__label {
  margin: 0 0 14px;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--text-3);
}

.page-faq .faq-nav__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-nav__link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line-faint);
  border-radius: var(--radius);
  color: var(--text-2);
  font-size: 0.875rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--text);
  border-color: var(--signal);
  background: var(--signal-dim);
  outline: none;
}

.page-faq .faq-nav__aside {
  display: none;
  margin-block-start: 32px;
  padding: 20px;
  border: 1px solid var(--line-faint);
  background: var(--ink-800);
}

.page-faq .faq-nav__tip {
  margin: 0 0 16px;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--text-3);
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-body {
  display: flex;
  flex-direction: column;
  gap: 72px;
  min-width: 0;
}

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

.page-faq .faq-section__head {
  margin: 0 0 32px;
}

.page-faq .faq-section__index {
  margin: 0 0 12px;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-section__intro {
  margin: 14px 0 0;
  max-width: 60ch;
  color: var(--text-2);
  line-height: 1.85;
}

/* ---------- 问答列表 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--line-faint);
}

.page-faq .faq-list--on-panel {
  border-top-color: var(--line-soft);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line-faint);
}

.page-faq .faq-list--on-panel .faq-item {
  border-bottom-color: var(--line-soft);
}

.page-faq .faq-item__h {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
}

.page-faq .faq-q {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  min-height: 44px;
  padding: 20px 4px 20px 18px;
  background: transparent;
  border: 0;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.65;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: var(--line-faint);
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-q:hover {
  color: var(--signal);
}

.page-faq .faq-q[aria-expanded="true"]::before {
  background: var(--signal);
}

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

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

.page-faq .faq-q__mark {
  flex: none;
  position: relative;
  width: 14px;
  height: 14px;
  margin-block-start: 6px;
  color: var(--text-3);
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-q__mark::before {
  left: 0;
  top: 6.5px;
  width: 14px;
  height: 1px;
}

.page-faq .faq-q__mark::after {
  left: 6.5px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-faq .faq-q:hover .faq-q__mark,
.page-faq .faq-q[aria-expanded="true"] .faq-q__mark {
  color: var(--signal);
}

.page-faq .faq-q[aria-expanded="true"] .faq-q__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

/* ---------- 答案 ---------- */
.page-faq .faq-a {
  padding: 0 4px 26px 18px;
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  max-width: 64ch;
  color: var(--text-2);
  line-height: 1.85;
}

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

.page-faq .faq-a__more {
  font-size: 0.8125rem;
  color: var(--text-3);
}

.page-faq .faq-a__more a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-dim);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-a__more a:hover,
.page-faq .faq-a__more a:focus-visible {
  border-bottom-color: var(--signal);
  outline: none;
}

/* ---------- 数据口径分区 ---------- */
.page-faq .faq-section--metrics {
  background: var(--indigo);
  border: 1px solid var(--line-soft);
  padding: 32px 20px;
}

.page-faq .fact-figure,
.page-faq .faq-figure {
  margin: 0 0 28px;
}

.page-faq .faq-figure--flow {
  margin: 32px 0 0;
}

/* ---------- 处理时限刻度 ---------- */
.page-faq .faq-scale {
  margin: 0 0 32px;
  padding: 20px 0 0;
}

.page-faq .faq-scale__track {
  position: relative;
  height: 2px;
  background: var(--line-faint);
  margin: 0 0 14px;
}

.page-faq .faq-scale__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 66%;
  background: var(--signal);
}

.page-faq .faq-scale__marks {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.page-faq .faq-scale__mark {
  position: relative;
  padding-inline-start: 12px;
}

.page-faq .faq-scale__mark::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 4px;
  background: var(--signal);
}

/* ---------- 结尾引导 ---------- */
.page-faq .faq-section--next {
  background: var(--ink-800);
  border: 1px solid var(--line-faint);
  padding: 32px 20px;
}

.page-faq .faq-next__title {
  margin: 12px 0 0;
  max-width: 22ch;
}

.page-faq .faq-next__lead {
  margin: 16px 0 0;
  max-width: 58ch;
  color: var(--text-2);
  line-height: 1.85;
}

.page-faq .faq-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: 28px;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-section--metrics,
  .page-faq .faq-section--next {
    padding: 40px 36px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding-block: 48px 72px;
  }

  .page-faq .faq-shell {
    grid-template-columns: var(--faq-nav-w) minmax(0, 1fr);
    gap: var(--faq-gap);
    padding-block: 56px 120px;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: calc(var(--topbar-h) + 32px);
    align-self: start;
  }

  .page-faq .faq-nav__list {
    display: block;
    overflow: visible;
    border-left: 1px solid var(--line-faint);
    padding: 0;
  }

  .page-faq .faq-nav__link {
    display: block;
    margin-inline-start: -1px;
    padding: 11px 0 11px 18px;
    border: 0;
    border-left: 1px solid transparent;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    font-size: 0.9375rem;
    line-height: 1.5;
  }

  .page-faq .faq-nav__link:hover,
  .page-faq .faq-nav__link:focus-visible {
    background: transparent;
    border-left-color: var(--signal);
  }

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

  .page-faq .faq-q {
    padding-inline: 24px 4px;
  }

  .page-faq .faq-a {
    padding-inline: 24px 4px;
  }

  .page-faq .faq-section--metrics,
  .page-faq .faq-section--next {
    padding: 48px 48px 44px;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-q::before,
  .page-faq .faq-q__mark::before,
  .page-faq .faq-q__mark::after,
  .page-faq .faq-nav__link,
  .page-faq .faq-a__more a {
    transition: none;
  }
}