.page-faq {
  --faq-rail: 296px;
  --faq-grid: 44px;
  --faq-muted: #5b6169;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(var(--grid-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-dark) 1px, transparent 1px);
  background-size: var(--faq-grid) var(--faq-grid);
  color: var(--paper);
  padding: clamp(26px, 5vw, 68px) 0 clamp(26px, 5vw, 52px);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: .45;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-hero .h1 {
  color: var(--white);
  margin-top: 12px;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(244, 239, 230, .84);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-metrics__wrap {
  margin-top: clamp(28px, 4vw, 52px);
}

.page-faq .faq-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
}

.page-faq .faq-metrics__item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 12px;
  border-top: 1px solid var(--line-dark);
}

.page-faq .faq-metrics__num {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-faq .faq-metrics__label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--steel);
  line-height: 1.6;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-body {
  padding: clamp(32px, 5vw, 76px) 0 clamp(40px, 6vw, 84px);
}

.page-faq .faq-layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index {
  background: var(--ink-900);
  color: var(--paper);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-1);
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--steel);
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(244, 239, 230, .86);
  text-decoration: none;
  transition: background .18s ease, border-color .18s ease, color .18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: rgba(43, 227, 198, .08);
  border-left-color: var(--cyan);
  color: var(--white);
}

.page-faq .faq-index__no {
  font-size: 12px;
  color: var(--lava);
  letter-spacing: .06em;
}

.page-faq .faq-index__foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-dark-soft);
  font-size: 13px;
  line-height: 1.85;
  color: var(--steel);
}

.page-faq .faq-index__figure {
  margin: 16px 0 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

.page-faq .faq-index__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(28px, 4vw, 46px);
  scroll-margin-top: 88px;
}

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

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  align-items: baseline;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--graphite);
}

.page-faq .faq-group__no {
  font-size: 13px;
  font-weight: 700;
  color: var(--lava-ink);
  letter-spacing: .06em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--graphite);
}

.page-faq .faq-group__hint {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--faq-muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-group .fold-stack {
  display: grid;
  gap: 10px;
}

.page-faq .faq-fold {
  background: var(--ink-900);
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .18s ease;
}

.page-faq .faq-fold:hover {
  box-shadow: var(--shadow-2);
}

.page-faq .faq-fold .fold__btn {
  display: flex;
  width: 100%;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: background .18s ease, color .18s ease;
}

.page-faq .faq-fold .fold__btn:hover,
.page-faq .faq-fold .fold__btn:focus-visible {
  background: rgba(43, 227, 198, .08);
  color: var(--white);
}

.page-faq .faq-fold .fold__sign {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--cyan);
}

.page-faq .faq-fold .fold__inner {
  background: var(--paper);
  color: var(--graphite);
  padding: 18px;
  font-size: 14.5px;
  line-height: 1.9;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-fold .fold__inner p {
  margin: 0 0 10px;
}

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

.page-faq .faq-next {
  display: inline-block;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--lava-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--lava);
  padding-bottom: 2px;
  transition: color .18s ease, border-color .18s ease;
}

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

/* ---------- 切换周期图示 ---------- */
.page-faq .faq-cycle {
  margin: 16px 0 0;
}

.page-faq .faq-cycle__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-faq .faq-cycle__cap {
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--faq-muted);
}

/* ---------- 尾段入口 ---------- */
.page-faq .faq-cta {
  background: var(--ink-900);
  background-image:
    linear-gradient(var(--grid-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-dark) 1px, transparent 1px);
  background-size: var(--faq-grid) var(--faq-grid);
  color: var(--paper);
  padding: clamp(34px, 5vw, 76px) 0;
  border-top: 1px solid var(--line-dark);
}

.page-faq .faq-cta .h2 {
  color: var(--white);
  margin: 10px 0 0;
}

.page-faq .faq-cta__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-cta__card {
  display: block;
  padding: 22px;
  background: var(--ink-800);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  color: var(--paper);
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.page-faq .faq-cta__card:hover,
.page-faq .faq-cta__card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-2);
}

.page-faq .faq-cta__card .h4 {
  margin: 12px 0 8px;
  color: var(--white);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.page-faq .faq-cta__card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-group__hint {
    grid-column: 2;
    margin-top: 4px;
  }
}

@media (min-width: 880px) {
  .page-faq .faq-cta__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-faq .faq-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 88px;
  }

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

@media (min-width: 1200px) {
  .page-faq .faq-hero__figure {
    margin-top: 8px;
  }
}
<<<END>>>