.page-faq {
  --faq-sticky-top: 104px;
  --faq-pad: 18px;
  --faq-no-col: 30px;
  background: var(--night-950);
  color: var(--mist-050);
}

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 13px;
  color: var(--fog-300);
}

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--slate-700);
}

.page-faq .breadcrumb__item a {
  color: var(--fog-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .breadcrumb__item a:hover,
.page-faq .breadcrumb__item a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-700);
}

/* 首屏框景 */
.page-faq .faq-hero {
  padding-top: clamp(16px, 4vw, 40px);
}

.page-faq .faq-hero__panel {
  position: relative;
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  padding: clamp(20px, 4vw, 44px);
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(11, 143, 125, 0.22), transparent 62%),
    linear-gradient(158deg, var(--pitch-950) 0%, var(--night-950) 68%);
  overflow: hidden;
}

.page-faq .faq-hero__panel::before {
  content: "";
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  border-top: 2px solid var(--cyan-400);
  border-right: 2px solid var(--cyan-400);
  opacity: 0.65;
  pointer-events: none;
}

.page-faq .faq-hero__panel::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 96px;
  height: 2px;
  background: var(--orange-500);
  opacity: 0.8;
  pointer-events: none;
}

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

.page-faq .faq-hero__text .display {
  margin: 10px 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist-050);
}

.page-faq .faq-hero__text .lead {
  margin: 0 0 22px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fog-300);
}

.page-faq .faq-search {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 11px 16px;
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-m);
  background: rgba(16, 32, 41, 0.86);
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-faq .faq-search:focus-within {
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 3px rgba(61, 245, 208, 0.14);
}

.page-faq .faq-search__label {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-search__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--mist-050);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  outline: none;
}

.page-faq .faq-search__input::placeholder {
  color: var(--fog-300);
  opacity: 0.8;
}

.page-faq .faq-search__hint {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fog-300);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--fog-300);
}

.page-faq .faq-hero__facts .num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--mist-050);
  margin-right: 6px;
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-m);
  border: 1px solid var(--slate-700);
  object-fit: cover;
}

.page-faq .faq-hero__figure figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fog-300);
}

/* 主体：左索引 + 右手风琴 */
.page-faq .faq-body {
  padding-top: clamp(32px, 6vw, 64px);
  padding-bottom: clamp(40px, 8vw, 88px);
}

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

.page-faq .faq-rail {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-m);
  background: var(--slate-850);
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fog-300);
}

.page-faq .faq-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 10px 10px 12px;
  border-left: 2px solid var(--slate-700);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(5, 11, 14, 0.35);
  color: var(--mist-050);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-left-color: var(--cyan-400);
  background: rgba(11, 143, 125, 0.2);
  color: var(--cyan-400);
}

.page-faq .faq-rail__count {
  flex: none;
  font-size: 12px;
  color: var(--amber-300);
}

.page-faq .faq-rail__hint {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fog-300);
}

.page-faq .faq-rail__hint .link-arrow {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-700);
  white-space: nowrap;
}

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

.page-faq .faq-group {
  scroll-margin-top: 92px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(34px, 6vw, 60px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--slate-700);
}

.page-faq .faq-group__icon {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  color: var(--cyan-400);
}

.page-faq .faq-group__icon svg {
  width: 20px;
  height: 20px;
}

.page-faq .faq-group__title {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--mist-050);
}

.page-faq .faq-group__head .tag {
  flex: none;
}

.page-faq .faq-item {
  border: 1px solid var(--slate-700);
  border-left: 2px solid var(--slate-700);
  border-radius: var(--radius-m);
  background: var(--slate-850);
  margin-top: 10px;
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-item:hover {
  border-left-color: var(--cyan-700);
}

.page-faq .faq-item[open] {
  border-left-color: var(--cyan-400);
  background: linear-gradient(180deg, rgba(11, 143, 125, 0.16), var(--slate-850) 72%);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: var(--faq-pad);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -3px;
  border-radius: var(--radius-m);
}

.page-faq .faq-item__no {
  flex: none;
  width: var(--faq-no-col);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.7;
  color: var(--cyan-400);
}

.page-faq .faq-item[open] .faq-item__no {
  color: var(--amber-300);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--mist-050);
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 4px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan-400);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.page-faq .faq-item__sign::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}

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

.page-faq .faq-item__a {
  padding: 0 var(--faq-pad) 18px calc(var(--faq-pad) + var(--faq-no-col) + 12px);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fog-300);
}

.page-faq .faq-item__a a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-700);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  border-bottom-color: var(--cyan-400);
}

.page-faq .faq-figure {
  margin: 22px 0 0;
  max-width: 360px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-m);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--fog-300);
}

/* 收束区 */
.page-faq .faq-tail {
  margin-top: clamp(44px, 8vw, 84px);
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--slate-700);
}

.page-faq .faq-tail .chapter-no {
  display: block;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan-400);
}

.page-faq .faq-tail__title {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--mist-050);
}

.page-faq .faq-tail__text {
  margin: 0 0 22px;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fog-300);
}

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

.page-faq .faq-tail__meta {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fog-300);
}

.page-faq .faq-tail__meta a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-700);
}

@media (min-width: 700px) {
  .page-faq .faq-rail__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__panel {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
  }

  .page-faq .faq-layout {
    grid-template-columns: 248px minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky-top);
    padding: 20px;
  }

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

  .page-faq .faq-rail__link {
    padding: 11px 12px 11px 14px;
  }

  .page-faq .faq-figure {
    max-width: 380px;
  }
}

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