.page-faq {
  --faq-rail-w: 236px;
  --faq-gap: clamp(32px, 5vw, 64px);
  --faq-cut: 14px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(40px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% -20% 40%;
  background-image: repeating-linear-gradient(
    -12deg,
    rgba(31, 107, 255, .16) 0 1px,
    transparent 1px 42px
  );
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--orange), var(--blue) 45%, transparent);
  opacity: .7;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

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

.page-faq .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-faq .breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.4vw, 64px);
  line-height: 1.04;
  letter-spacing: .01em;
  max-width: 18ch;
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 54ch;
  color: var(--paper-dim);
}

.page-faq .faq-hero__note {
  margin: 12px 0 0;
  max-width: 56ch;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__media {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-shot {
  position: relative;
  border: 1px solid var(--line);
  background: var(--ink-800);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%
  );
}

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

.page-faq .faq-hero__media .media-frame__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  text-align: left;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-faq .faq-rail {
  min-width: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 2px 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  color: var(--paper-dim);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
}

.page-faq .faq-rail__num {
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-rail__count {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--blue);
  color: var(--paper);
  box-shadow: inset 3px 0 0 var(--orange);
  outline: none;
}

.page-faq .faq-rail__hint {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}

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

.page-faq .faq-group + .faq-group {
  margin-top: var(--faq-gap);
  padding-top: var(--faq-gap);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.2;
  letter-spacing: .01em;
}

.page-faq .faq-group__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-figure {
  margin: 22px 0 6px;
}

.page-faq .faq-figure .media-frame__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  margin-top: 6px;
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line-soft);
  transition: border-color var(--t-fast);
}

.page-faq .faq-item[open] {
  border-bottom-color: rgba(31, 107, 255, .55);
}

.page-faq .faq-item__q {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: start;
  padding: 18px 12px 18px 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  transition: color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--paper);
  background: rgba(31, 107, 255, .07);
  box-shadow: inset 3px 0 0 var(--orange);
  outline: none;
}

.page-faq .faq-item__idx {
  font-size: 12px;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  padding-top: 3px;
}

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

.page-faq .faq-item__sign {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
  flex: none;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform var(--t-fast), background var(--t-fast);
}

.page-faq .faq-item__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

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

.page-faq .faq-item[open] .faq-item__sign::before {
  background: var(--magenta);
}

.page-faq .faq-item__q:hover .faq-item__sign::before {
  background: var(--orange);
}

.page-faq .faq-item__a {
  padding: 0 12px 20px 34px;
  max-width: 62ch;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-faq .faq-item__a p + p {
  margin-top: 14px;
}

.page-faq .faq-copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-faq .faq-copy-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .faq-inline-link {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-inline-link a {
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, .5);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-faq .faq-inline-link a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 768px) {
  .page-faq .faq-item__q {
    padding: 20px 16px 20px 10px;
    font-size: 16px;
    gap: 16px;
  }

  .page-faq .faq-item__a {
    padding: 0 16px 22px 42px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 4px;
    padding: 0;
    overflow: visible;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    justify-content: flex-start;
    background: transparent;
    border-color: transparent;
    border-left: 2px solid var(--line);
    padding: 10px 10px 10px 12px;
  }

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

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-left-color: var(--orange);
    border-top-color: var(--line);
    border-right-color: var(--line);
    border-bottom-color: var(--line);
    background: var(--ink-800);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-item__q,
  .page-faq .faq-inline-link a {
    transition: none;
  }
}
<<<END>>>