.page-faq {
  --faq-panel: rgba(22, 50, 79, 0.62);
  --faq-panel-open: #0d2036;
  --faq-hl-bg: rgba(255, 122, 47, 0.12);
  --faq-hl-line: rgba(255, 122, 47, 0.38);
  padding-bottom: clamp(56px, 8vw, 112px);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 18px;
  padding: clamp(28px, 5vw, 72px) 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-serif);
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 8px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-hero__stat {
  background: var(--ink-1);
  padding: 14px 16px;
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
}

.page-faq .faq-hero__stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-hero__stat dt {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .faq-hero__stat--alert dd {
  color: var(--orange);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 44px);
  padding-top: clamp(26px, 4vw, 48px);
}

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

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-faq .faq-rail__item {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-bottom: 2px solid var(--line);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible,
.page-faq .faq-rail__link.is-active {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: rgba(53, 242, 214, 0.07);
}

.page-faq .faq-rail__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
  color: var(--orange);
}

.page-faq .faq-rail__note {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

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

/* ---------- 筛选 ---------- */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 96px;
  padding-bottom: 6px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(34px, 5vw, 64px);
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px dashed var(--line);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 8px;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-group__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 20px;
}

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

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  margin-bottom: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background: var(--faq-panel);
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-faq .qa:hover {
  border-color: rgba(53, 242, 214, 0.45);
}

.page-faq .qa[open] {
  background: var(--faq-panel-open);
  border-color: rgba(53, 242, 214, 0.55);
}

.page-faq .qa__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--radius-organic);
}

.page-faq .qa__code {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-faq .qa__q {
  min-width: 0;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
}

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

.page-faq .qa__icon {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 3px;
}

.page-faq .qa__icon::before,
.page-faq .qa__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 1px;
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.page-faq .qa__icon::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-faq .qa__icon::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

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

.page-faq .qa__body {
  padding: 0 16px 18px;
}

.page-faq .qa__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(234, 242, 248, 0.88);
}

/* ---------- 高亮数字 ---------- */
.page-faq .faq-hl {
  display: inline-block;
  padding: 0 6px;
  border: 1px solid var(--faq-hl-line);
  border-radius: 4px;
  background: var(--faq-hl-bg);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.92em;
  color: var(--orange);
}

/* ---------- 底部联系 ---------- */
.page-faq .faq-tail {
  display: grid;
  gap: 22px;
  margin-top: clamp(40px, 6vw, 88px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(53, 242, 214, 0.1), transparent 55%),
    linear-gradient(140deg, var(--ink-1) 0%, var(--pool) 100%);
}

.page-faq .faq-tail__title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-tail__copy p {
  margin: 0 0 18px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(234, 242, 248, 0.82);
}

.page-faq .faq-tail__list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-tail__key {
  display: block;
  margin-bottom: 3px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-tail__val {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--cyan-soft);
  overflow-wrap: anywhere;
}

.page-faq .faq-tail__link {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 214, 0.4);
}

.page-faq .faq-tail__link:hover,
.page-faq .faq-tail__link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 52px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    padding: 10px 12px 10px 14px;
    border-bottom: 0;
    border-left: 2px solid var(--line);
    white-space: normal;
    font-size: 14px;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible,
  .page-faq .faq-rail__link.is-active {
    border-bottom-color: transparent;
    border-left-color: var(--cyan);
  }

  .page-faq .faq-tail {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 3vw, 48px);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-shell {
    grid-template-columns: 224px minmax(0, 1fr);
  }

  .page-faq .qa__summary {
    padding: 18px 20px;
  }

  .page-faq .qa__body {
    padding: 0 20px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__icon::before,
  .page-faq .qa__icon::after,
  .page-faq .qa,
  .page-faq .faq-rail__link {
    transition: opacity 0.15s linear;
  }

  .page-faq .qa[open] .qa__icon::after {
    transform: none;
  }
}
<<<END>>>