.page-faq {
  --faq-rail-w: 220px;
  --faq-gap: var(--s2);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: var(--s4) 0 var(--s6);
  border-bottom: 1px solid var(--line-700);
  position: relative;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 96px;
  height: 3px;
  background: var(--lime);
}
.page-faq .faq-hero__title {
  margin: var(--s2) 0 var(--s2);
  font-size: clamp(38px, 7.2vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  max-width: 16ch;
}
.page-faq .faq-hero .lead {
  max-width: 66ch;
  color: var(--white);
  opacity: 0.86;
}
.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: var(--s4);
  background: var(--line-700);
  border: 1px solid var(--line-700);
}
.page-faq .faq-hero__stat {
  background: var(--ink-900);
  padding: var(--s2) 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-faq .faq-hero__statnum {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 34px);
  color: var(--lime);
  letter-spacing: -0.02em;
}
.page-faq .faq-hero__statlabel {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index {
  padding: var(--s6) 0 var(--s4);
}
.page-faq .faq-index__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
  margin-top: var(--s3);
}
.page-faq .faq-index__card {
  background: var(--panel-900);
  padding: var(--s2);
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 16px;
  row-gap: 6px;
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}
.page-faq .faq-index__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background 0.25s var(--ease);
}
.page-faq .faq-index__card:hover,
.page-faq .faq-index__card:focus-visible {
  background: var(--card-900);
  transform: translateY(-2px);
}
.page-faq .faq-index__card:hover::before,
.page-faq .faq-index__card:focus-visible::before {
  background: var(--lime);
}
.page-faq .faq-index__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--lime);
  padding-top: 4px;
  letter-spacing: 0.04em;
}
.page-faq .faq-index__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}
.page-faq .faq-index__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 双轨布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s3);
  padding: var(--s4) 0 var(--s8);
}
.page-faq .faq-rail {
  align-self: start;
  padding-bottom: var(--s2);
  border-bottom: 1px solid var(--line-700);
}
.page-faq .faq-rail__caption {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-faq .faq-rail__list::-webkit-scrollbar {
  height: 4px;
}
.page-faq .faq-rail__list::-webkit-scrollbar-thumb {
  background: var(--line-700);
}
.page-faq .faq-rail__link {
  display: block;
  white-space: nowrap;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--white);
  text-decoration: none;
  border: 1px solid var(--line-700);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
}
.page-faq .faq-rail__foot {
  display: none;
  margin: var(--s2) 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-flow {
  display: flex;
  flex-direction: column;
  gap: var(--s6);
  min-width: 0;
}
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
  border-top: 1px solid var(--line-700);
  padding-top: var(--s3);
  position: relative;
}
.page-faq .faq-group::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 64px;
  height: 2px;
  background: var(--lime);
}
.page-faq .faq-group__head {
  margin-bottom: var(--s3);
}
.page-faq .faq-group__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.06em;
}
.page-faq .faq-group__title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.08;
  color: var(--white);
}
.page-faq .faq-group__note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}
.page-faq .faq-group__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s3);
  align-items: start;
}
.page-faq .faq-group__figure {
  margin: 0;
}
.page-faq .faq-group__figure.media--tall .media__frame {
  aspect-ratio: 3 / 2;
}
.page-faq .faq-group__items {
  display: flex;
  flex-direction: column;
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line-700);
}
.page-faq .faq-item__q {
  list-style: none;
  cursor: pointer;
  padding: 18px 34px 18px 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
  position: relative;
  transition: color 0.2s var(--ease);
}
.page-faq .faq-item__q::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item__q::after {
  content: "";
  position: absolute;
  right: 4px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.28s var(--ease), border-color 0.2s var(--ease);
}
.page-faq .faq-item[open] > .faq-item__q::after {
  transform: rotate(-135deg);
  border-color: var(--lime);
}
.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--lime);
}
.page-faq .faq-item__a {
  padding: 0 34px var(--s2) 0;
  color: var(--white);
  opacity: 0.86;
  font-size: 15px;
  line-height: 1.78;
  animation: faq-open 0.3s var(--ease) both;
}
.page-faq .faq-item__a p {
  margin: 0 0 12px;
  max-width: 68ch;
}
.page-faq .faq-item__a p:last-child {
  margin-bottom: 0;
}
@keyframes faq-open {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 0.86; transform: translateY(0); }
}

/* ---------- 步骤条 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-700);
}
.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 12px;
  padding: 0 0 14px 14px;
  position: relative;
  font-size: 15px;
  line-height: 1.7;
}
.page-faq .faq-steps li:last-child {
  padding-bottom: 0;
}
.page-faq .faq-steps li::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--lime);
  border-radius: 50%;
}
.page-faq .faq-steps__n {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  padding-top: 3px;
}

/* ---------- 字段定义 ---------- */
.page-faq .faq-defs {
  margin: 0 0 var(--s3);
  border: 1px solid var(--line-700);
  border-top-color: var(--lime);
  background: var(--panel-900);
}
.page-faq .faq-defs__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px var(--s2);
  border-bottom: 1px solid var(--line-700);
  transition: background 0.2s var(--ease);
}
.page-faq .faq-defs__row:last-child {
  border-bottom: 0;
}
.page-faq .faq-defs__row:hover {
  background: var(--card-900);
}
.page-faq .faq-defs__term {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--lime);
  letter-spacing: 0.02em;
}
.page-faq .faq-defs__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--white);
  opacity: 0.86;
}
.page-faq .faq-defs__ex {
  display: inline-block;
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  border: 1px dashed var(--line-700);
  padding: 1px 7px;
  border-radius: var(--radius);
  white-space: nowrap;
}

/* ---------- 联系区 ---------- */
.page-faq .faq-group--contact {
  background: var(--panel-900);
  border: 1px solid var(--line-700);
  border-top: 2px solid var(--lime);
  padding: var(--s3) var(--s2) var(--s4);
}
.page-faq .faq-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
  margin-bottom: var(--s3);
}
.page-faq .faq-contact__col {
  background: var(--ink-900);
  padding: var(--s2);
}
.page-faq .faq-contact__k {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .faq-contact__v {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.2vw, 20px);
  color: var(--lime);
  word-break: break-all;
}
.page-faq .faq-contact__n {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.page-faq .faq-contact__links {
  margin: var(--s3) 0 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--muted);
}
.page-faq .faq-contact__links a {
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--line-700);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.page-faq .faq-contact__links a:hover,
.page-faq .faq-contact__links a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 焦点可达 ---------- */
.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-defs__row {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--s2);
    align-items: baseline;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--s6);
  }
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + var(--s2));
    border-bottom: 0;
    padding-bottom: 0;
    border-left: 1px solid var(--line-700);
    padding-left: 18px;
  }
  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
  }
  .page-faq .faq-rail__list li + li {
    margin-top: 6px;
  }
  .page-faq .faq-rail__link {
    border: 0;
    padding: 6px 0;
    font-size: 14px;
    color: var(--muted);
    white-space: normal;
    position: relative;
  }
  .page-faq .faq-rail__link::before {
    content: "";
    position: absolute;
    left: -19px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--lime);
    transition: height 0.22s var(--ease);
  }
  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    color: var(--lime);
  }
  .page-faq .faq-rail__link:hover::before,
  .page-faq .faq-rail__link:focus-visible::before {
    height: 18px;
  }
  .page-faq .faq-rail__foot {
    display: block;
  }
  .page-faq .faq-group__cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: var(--s4);
  }
  .page-faq .faq-group__figure {
    position: sticky;
    top: calc(var(--header-h) + var(--s3));
  }
  .page-faq .faq-item__q {
    font-size: 17px;
  }
  .page-faq .faq-group--contact {
    padding: var(--s4) var(--s4) var(--s6);
  }
}

@media (min-width: 1440px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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