.page-faq {
  --faq-rail-w: 238px;
  --faq-gap: clamp(22px, 3.4vw, 48px);
  color: var(--c-mist);
  font-family: var(--font-body);
  background:
    radial-gradient(1100px 480px at 88% -8%, rgba(53, 214, 230, 0.1), transparent 62%),
    radial-gradient(700px 420px at 2% 22%, rgba(122, 46, 69, 0.16), transparent 70%),
    linear-gradient(180deg, var(--c-abyss) 0%, #061523 48%, var(--c-deep) 100%);
}

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

.page-faq .faq-shell {
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-faq .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--c-line);
}

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

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 58px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: clamp(14.5px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(234, 242, 246, 0.84);
}

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

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 26px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12.5px;
  color: var(--c-steel);
}

.page-faq .faq-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-amber);
  letter-spacing: 0.02em;
}

.page-faq .faq-hero__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-panel);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.page-faq .faq-hero__figure::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(53, 214, 230, 0.1) 62%, transparent);
  z-index: 1;
}

.page-faq .faq-hero__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.92;
}

.page-faq .faq-hero__caption,
.page-faq .faq-figure__caption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  font-size: 12px;
  color: var(--c-steel);
  border-top: 1px solid var(--c-line);
  background: rgba(5, 17, 31, 0.55);
}

.page-faq .faq-hero__caption .mono,
.page-faq .faq-figure__caption .mono {
  font-family: var(--font-mono);
  color: var(--c-amber-soft);
  letter-spacing: 0.06em;
}

/* ---------- 索引 + 问答主体 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  padding-top: clamp(28px, 4.4vw, 54px);
}

.page-faq .faq-rail {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 16px 18px;
  background: linear-gradient(180deg, var(--c-panel-soft), rgba(10, 34, 55, 0.34));
}

.page-faq .faq-rail__title {
  margin: 0;
  color: var(--c-cyan);
  letter-spacing: 0.14em;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--c-mist);
  text-decoration: none;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-faq .faq-rail__link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-steel);
  transition: color 160ms var(--ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--c-cyan-soft);
  border-color: var(--c-line-strong);
}

.page-faq .faq-rail__link[aria-current="location"] {
  color: var(--c-cyan);
  border-color: var(--c-line-strong);
  background: rgba(53, 214, 230, 0.08);
}

.page-faq .faq-rail__link[aria-current="location"] .mono {
  color: var(--c-cyan);
}

.page-faq .faq-rail__note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--c-line);
  font-size: 12px;
  line-height: 1.75;
  color: var(--c-steel);
}

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

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-offset) + 28px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(34px, 5vw, 58px);
}

.page-faq .faq-group__head {
  padding-left: 16px;
  border-left: 2px solid var(--c-cyan);
}

.page-faq .faq-group__head .eyebrow {
  margin: 0;
  color: var(--c-steel);
  letter-spacing: 0.16em;
}

.page-faq .faq-group__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 29px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--c-mist);
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-steel);
}

.page-faq .faq-list {
  margin-top: 18px;
  border-top: 1px solid var(--c-line);
}

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

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 2px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--c-mist);
  cursor: pointer;
  list-style: none;
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item[open] .faq-item__q {
  color: var(--c-cyan-soft);
}

.page-faq .faq-item__q:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 3px;
}

.page-faq .faq-item__q-text {
  min-width: 0;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 6px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--c-cyan);
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-faq .faq-item__mark::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 0 26px 18px 2px;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(234, 242, 246, 0.82);
}

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

.page-faq .faq-item__a a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 214, 230, 0.4);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

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

/* ---------- 版本路径图 ---------- */
.page-faq .faq-figure {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-panel);
  overflow: hidden;
}

.page-faq .faq-figure img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  opacity: 0.9;
}

/* ---------- 结尾咨询区 ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: 22px;
  margin-top: clamp(40px, 6vw, 74px);
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid var(--c-line-strong);
  border-radius: var(--radius);
  background:
    radial-gradient(520px 240px at 92% 0%, rgba(242, 180, 92, 0.14), transparent 66%),
    linear-gradient(140deg, rgba(18, 58, 85, 0.9), rgba(5, 17, 31, 0.94));
  box-shadow: var(--glow-cyan);
}

.page-faq .faq-cta .eyebrow {
  margin: 0;
  color: var(--c-amber);
  letter-spacing: 0.16em;
}

.page-faq .faq-cta__title {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-mist);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(234, 242, 246, 0.8);
}

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

.page-faq .faq-cta__list li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 0;
  border-top: 1px solid var(--c-line);
  font-size: 14px;
  color: var(--c-mist);
}

.page-faq .faq-cta__list .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-amber-soft);
}

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

.page-faq .faq-topline {
  margin: clamp(26px, 4vw, 38px) 0 0;
  text-align: right;
}

.page-faq .faq-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-steel);
  text-decoration: none;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-top:hover {
  color: var(--c-cyan);
  border-color: var(--c-line-strong);
}

/* ---------- 响应式 ---------- */
@media (min-width: 860px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.65fr);
    align-items: start;
  }

  .page-faq .faq-cta__actions {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-offset) + 18px);
  }

  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list li + li {
    margin-top: 6px;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    white-space: normal;
    border-color: transparent;
    padding: 8px 10px;
  }

  .page-faq .faq-item__q {
    padding: 18px 4px;
    font-size: 15.5px;
  }

  .page-faq .faq-item__a {
    padding: 0 48px 20px 4px;
  }
}

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