.page-faq {
  --faq-num: rgba(49, 242, 208, 0.32);
  --faq-card: rgba(18, 34, 51, 0.78);
  --faq-rail-w: 272px;
  background:
    radial-gradient(1100px 520px at 84% -14%, rgba(14, 79, 92, 0.55), transparent 70%),
    var(--ink-navy);
  color: var(--board-white);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-mast {
  position: relative;
  isolation: isolate;
  padding: clamp(18px, 3vw, 28px) 0 clamp(34px, 5vw, 62px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-mast::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(104deg, transparent 57%, rgba(255, 107, 44, 0.16) 57%, rgba(255, 107, 44, 0.16) 73%, transparent 73%),
    linear-gradient(104deg, transparent 43%, rgba(49, 242, 208, 0.1) 43%, rgba(49, 242, 208, 0.1) 57%, transparent 57%);
  pointer-events: none;
}

.page-faq .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-mast__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-faq .faq-mast__title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.4vw, 3.9rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.page-faq .faq-mast__title em {
  font-style: normal;
  color: var(--neon-cyan);
  display: inline-block;
  position: relative;
}

.page-faq .faq-mast__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 3px;
  background: var(--volt-orange);
}

.page-faq .faq-mast__lede {
  max-width: 54ch;
  color: rgba(244, 247, 250, 0.82);
}

.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-facts__item {
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
  padding: 14px 16px;
  background: var(--faq-card);
}

.page-faq .faq-facts dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--slate-blue);
}

.page-faq .faq-facts__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--board-white);
}

.page-faq .faq-facts__num span {
  font-size: 0.62em;
  color: var(--neon-cyan);
  margin-left: 3px;
}

/* ---------- 主体分屏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(28px, 5vw, 56px) var(--gutter) clamp(48px, 7vw, 96px);
}

.page-faq .faq-rail {
  border-top: 1px solid var(--line-cyan);
  padding-top: 16px;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--board-white);
  font-size: 0.9rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  background: rgba(27, 42, 58, 0.55);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-left-color: var(--neon-cyan);
  background: rgba(49, 242, 208, 0.1);
  outline: none;
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--neon-cyan);
}

.page-faq .faq-rail__count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--slate-blue);
  padding: 1px 5px;
  border: 1px solid var(--line);
}

.page-faq .faq-rail__hint {
  margin: 12px 0 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--slate-blue);
}

/* ---------- 问题区块 ---------- */
.page-faq .faq-block {
  scroll-margin-top: 96px;
  padding-bottom: clamp(30px, 4vw, 46px);
}

.page-faq .faq-block + .faq-block {
  padding-top: clamp(30px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-block__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 8px;
  align-items: start;
  margin-bottom: 18px;
}

.page-faq .faq-block__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 700;
  line-height: 0.95;
  color: var(--faq-num);
  letter-spacing: -0.04em;
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
}

.page-faq .faq-block__note {
  grid-column: 2;
  margin: 0;
  max-width: 58ch;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--slate-blue);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border-top: 1px solid var(--line);
}

.page-faq .qa:last-child {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 38px 16px 2px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(0.98rem, 1.7vw, 1.06rem);
  font-weight: 600;
  line-height: 1.55;
  color: var(--board-white);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa__q::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 0.6em;
  background: var(--slate-blue);
  transition: background-color 0.2s var(--ease);
}

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--neon-cyan);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

.page-faq .qa[open] .qa__q,
.page-faq .qa__q:hover {
  color: var(--neon-cyan);
}

.page-faq .qa[open] .qa__q::before {
  background: var(--neon-cyan);
}

.page-faq .qa__a {
  margin: 0 0 0 3px;
  padding: 2px 0 22px 19px;
  border-left: 1px solid var(--line-cyan);
  font-size: 0.95rem;
  line-height: 1.78;
  color: rgba(244, 247, 250, 0.84);
}

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

.page-faq .qa__a p:last-of-type {
  margin-bottom: 12px;
}

.page-faq .qa__next {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--neon-cyan);
  padding-bottom: 3px;
  border-bottom: 1px solid var(--line-cyan);
}

.page-faq .qa__next::after {
  content: "→";
}

.page-faq .qa__next:hover,
.page-faq .qa__next:focus-visible {
  color: var(--volt-orange);
  border-bottom-color: var(--volt-orange);
  outline: none;
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line-strong);
  background: var(--track-grey);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-faq .faq-figure figcaption {
  padding: 10px 13px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.06em;
  color: var(--slate-blue);
}

.page-faq .faq-figure--support {
  border-color: rgba(255, 107, 44, 0.45);
}

.page-faq .faq-figure--support figcaption {
  color: var(--paper-beige);
  border-top-color: rgba(255, 107, 44, 0.3);
}

/* ---------- 宽屏 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-figure {
    max-width: 560px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-mast__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 68px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
  }

  .page-faq .faq-rail__list {
    display: grid;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
    margin-top: 12px;
  }

  .page-faq .faq-rail__list li {
    flex: none;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    justify-content: flex-start;
    white-space: normal;
    padding: 10px 12px;
  }

  .page-faq .faq-rail__count {
    margin-left: auto;
  }
}

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