.page-faq {
  --faq-strip-gap: 34px;
  --faq-line-w: 3px;
  background: var(--ab-void);
  color: var(--ab-ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 44px;
  background: #04060B;
  border-bottom: var(--faq-line-w) solid var(--ab-line);
}

.page-faq .faq-hero__img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% 45%;
  opacity: .26;
  filter: saturate(.6) contrast(1.08);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(6, 9, 15, .38) 0%, rgba(6, 9, 15, .9) 74%, var(--ab-void) 100%),
    repeating-linear-gradient(90deg, rgba(29, 41, 65, .5) 0 1px, transparent 1px 86px);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 2;
}

.page-faq .faq-hero__cols {
  display: grid;
  gap: 26px;
  margin-top: 20px;
}

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-family: var(--ab-font-cn);
  font-size: clamp(30px, 7.4vw, 62px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--ab-ink);
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  margin: 16px 0 0;
  max-width: 46em;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ab-muted);
}

/* ---------- 搜索框 ---------- */
.page-faq .faq-search {
  border: 2px solid var(--ab-line);
  background: rgba(12, 19, 31, .88);
  border-radius: var(--ab-radius);
  padding: 13px 14px 14px;
  box-shadow: var(--ab-shadow);
}

.page-faq .faq-search__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--ab-font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ab-cyan);
}

.page-faq .faq-search__input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  background: var(--ab-void);
  border: 1px solid var(--ab-line);
  border-radius: var(--ab-radius);
  color: var(--ab-ink);
  font-family: var(--ab-font-cn);
  font-size: 15px;
  line-height: 1.4;
  outline: none;
  transition: border-color .18s ease, box-shadow .18s ease;
}

.page-faq .faq-search__input::placeholder {
  color: #5D6D85;
}

.page-faq .faq-search__input:focus {
  border-color: var(--ab-cyan);
  box-shadow: 0 0 0 2px var(--ab-cyan-12);
}

.page-faq .faq-search__hint {
  margin: 9px 0 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ab-muted);
  font-family: var(--ab-font-mono);
  letter-spacing: .02em;
}

/* ---------- 主体 ---------- */
.page-faq .faq-shell {
  padding: 34px 0 78px;
}

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index__title {
  margin: 0 0 10px;
  font-family: var(--ab-font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ab-muted);
}

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

.page-faq .faq-index__list::-webkit-scrollbar {
  display: none;
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: var(--faq-line-w) solid var(--ab-line);
  color: var(--ab-muted);
  font-size: 13.5px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-faq .faq-index__link:hover {
  color: var(--ab-ink);
  border-bottom-color: var(--ab-cyan-35);
}

.page-faq .faq-index__link.is-active {
  color: var(--ab-ink);
  border-bottom-color: var(--ab-cyan);
  background: var(--ab-cyan-06);
}

.page-faq .faq-index__no {
  font-family: var(--ab-font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--ab-cyan);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  border-top: var(--faq-line-w) solid var(--ab-line);
  padding-top: 18px;
  margin-bottom: 48px;
  scroll-margin-top: 96px;
}

.page-faq .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  padding: 2px 7px;
  border: 1px solid var(--ab-cyan-35);
  border-radius: var(--ab-radius);
  font-family: var(--ab-font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--ab-cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--ab-font-cn);
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.2;
  color: var(--ab-ink);
}

.page-faq .faq-group__count {
  margin-left: auto;
  font-family: var(--ab-font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--ab-muted);
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  position: relative;
  margin: 0 0 16px;
  border: 1px solid var(--ab-line);
  border-left: var(--faq-line-w) solid var(--ab-red);
  border-radius: var(--ab-radius);
  background: var(--ab-void);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: .84;
}

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--ab-line);
  background: var(--ab-board);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ab-muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  margin-bottom: 10px;
  background: var(--ab-board);
  border: 1px solid var(--ab-line);
  border-left: var(--faq-line-w) solid var(--ab-line);
  border-radius: var(--ab-radius);
  transition: border-color .18s ease, box-shadow .18s ease, background-color .18s ease;
}

.page-faq .faq-item:hover {
  border-left-color: var(--ab-cyan-35);
}

.page-faq .faq-item[open] {
  border-left-color: var(--ab-cyan);
  box-shadow: var(--ab-shadow);
  background: linear-gradient(180deg, var(--ab-cyan-06), transparent 46%), var(--ab-board);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--ab-ink);
  transition: background-color .18s ease;
}

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

.page-faq .faq-item__q:hover {
  background: rgba(43, 231, 214, .045);
}

.page-faq .faq-item__no {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--ab-font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--ab-muted);
  transition: color .18s ease;
}

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

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  font-family: var(--ab-font-cn);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.48;
  letter-spacing: -.005em;
  color: inherit;
}

.page-faq .faq-item__mark {
  flex: 0 0 auto;
  align-self: center;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--ab-muted);
  border-bottom: 2px solid var(--ab-muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .2s ease, border-color .2s ease;
}

.page-faq .faq-item[open] .faq-item__mark {
  transform: rotate(-135deg) translate(-2px, -2px);
  border-color: var(--ab-cyan);
}

.page-faq .faq-item__a {
  padding: 2px 16px 16px 16px;
  color: var(--ab-muted);
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 42em;
}

.page-faq .faq-item__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--ab-line);
}

.page-faq .faq-item__link {
  margin-left: auto;
  padding-bottom: 2px;
  color: var(--ab-cyan);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  border-bottom: 1px solid var(--ab-cyan-35);
  transition: border-color .18s ease, color .18s ease;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-item__a {
    padding-left: 42px;
  }

  .page-faq .faq-group {
    margin-bottom: 56px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero {
    padding: 32px 0 54px;
  }

  .page-faq .faq-hero__cols {
    grid-template-columns: minmax(0, 1fr) 358px;
    gap: 48px;
    align-items: end;
    margin-top: 24px;
  }

  .page-faq .faq-shell {
    padding: 46px 0 96px;
  }

  .page-faq .faq-body {
    grid-template-columns: 222px minmax(0, 1fr);
    gap: 54px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

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

  .page-faq .faq-index__item {
    flex: none;
  }

  .page-faq .faq-index__link {
    border-bottom: none;
    border-left: var(--faq-line-w) solid var(--ab-line);
    padding: 10px 12px;
    white-space: normal;
    font-size: 14px;
  }

  .page-faq .faq-index__link:hover {
    border-left-color: var(--ab-cyan-35);
  }

  .page-faq .faq-index__link.is-active {
    border-left-color: var(--ab-cyan);
    border-bottom-color: transparent;
  }

  .page-faq .faq-group {
    margin-bottom: 64px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-body {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 66px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-item__no,
  .page-faq .faq-item__mark,
  .page-faq .faq-item__link,
  .page-faq .faq-index__link,
  .page-faq .faq-search__input {
    transition: none !important;
  }
}
<<<END>>>

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