.page-faq {
  --faq-line: 2px solid var(--ink-700);
  --faq-hard: 8px 8px 0 rgba(3, 16, 11, .92);
  display: block;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(900px 420px at 88% -8%, rgba(59, 240, 200, .10), transparent 62%),
    radial-gradient(680px 340px at 4% 16%, rgba(255, 176, 46, .06), transparent 60%);
  background-repeat: no-repeat;
  color: var(--mist-100);
  font-family: var(--font-body);
  padding-bottom: clamp(64px, 9vw, 132px);
  overflow-wrap: break-word;
}

.page-faq .breadcrumb {
  padding-top: clamp(20px, 3.4vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(26px, 4.6vw, 52px) 0 clamp(34px, 5vw, 62px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-faq .faq-hero .h-display {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 5.4vw, 54px);
  line-height: 1.1;
  letter-spacing: -.022em;
  color: var(--mist-100);
  margin: 0 0 clamp(16px, 2vw, 22px);
  max-width: 15.5em;
}

.page-faq .faq-hero__lede {
  margin: 0 0 clamp(22px, 3vw, 30px);
  max-width: 44em;
  font-size: clamp(15px, 1.55vw, 16.5px);
  line-height: 1.95;
  color: var(--mist-400);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 10px;
  border: var(--faq-line);
  background: var(--ink-800);
  box-shadow: var(--faq-hard);
}

.page-faq .faq-jump__icon {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin: 0 4px 0 6px;
  stroke: var(--cyan-400);
  stroke-width: 2;
  fill: none;
}

.page-faq .faq-jump__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  line-height: 1;
  color: var(--mist-400);
  text-decoration: none;
  border: 1px solid var(--ink-700);
  transition: color .22s var(--ease), background-color .22s var(--ease), border-color .22s var(--ease);
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  color: var(--ink-900);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}

.page-faq .faq-hero__visual {
  border: var(--faq-line);
  box-shadow: var(--faq-hard);
  background: var(--ink-800);
  overflow: hidden;
  margin: 0;
}

.page-faq .faq-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding-top: clamp(38px, 5.5vw, 72px);
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 48px);
  align-items: start;
}

/* ---------- 左侧分组索引 ---------- */
.page-faq .faq-index {
  min-width: 0;
}

.page-faq .faq-index__figure {
  margin: 0 0 20px;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  overflow: hidden;
}

.page-faq .faq-index__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 25 / 16;
  object-fit: cover;
}

.page-faq .faq-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist-400);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  color: var(--mist-400);
  text-decoration: none;
  font-size: 13.5px;
  line-height: 1.2;
  white-space: nowrap;
  transition: color .22s var(--ease), border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan-400);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--cyan-200);
  border-color: var(--cyan-400);
}

/* ---------- 右侧问答流 ---------- */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 118px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(48px, 6vw, 86px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink-700);
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: rgba(59, 240, 200, .22);
  -webkit-text-stroke: 1px rgba(59, 240, 200, .5);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--mist-100);
}

.page-faq .faq-group__note {
  margin: 14px 0 4px;
  max-width: 58em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist-400);
}

.page-faq .faq-group__note a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa {
  border-bottom: 1px dashed var(--ink-700);
  transition: border-color .25s var(--ease);
}

.page-faq .qa[open] {
  border-bottom-style: solid;
  border-bottom-color: var(--cyan-400);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  list-style: none;
  cursor: pointer;
  padding: 17px 42px 17px 0;
  font-size: clamp(15px, 1.65vw, 16.5px);
  font-weight: 500;
  line-height: 1.65;
  color: var(--mist-100);
  transition: color .2s var(--ease);
}

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

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

.page-faq .qa__q:hover {
  color: var(--cyan-200);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-faq .qa__q::after {
  content: "";
  position: absolute;
  right: 4px;
  top: 50%;
  width: 13px;
  height: 13px;
  transform: translateY(-50%);
  background-image:
    linear-gradient(var(--cyan-400), var(--cyan-400)),
    linear-gradient(var(--cyan-400), var(--cyan-400));
  background-size: 13px 2px, 2px 13px;
  background-position: center center;
  background-repeat: no-repeat;
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  transform: translateY(-50%) rotate(135deg);
  opacity: .5;
}

.page-faq .qa__a {
  padding: 2px 42px 26px 0;
  animation: faq-open .34s var(--ease) both;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 60em;
  font-size: clamp(14px, 1.5vw, 15.5px);
  line-height: 1.95;
  color: var(--mist-400);
}

.page-faq .qa__a a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-group__num {
    -webkit-text-stroke-width: 1.2px;
  }
}

@media (min-width: 920px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(32px, 4.4vw, 64px);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body__grid {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(40px, 4.6vw, 80px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: 112px;
    align-self: start;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    overflow-x: hidden;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-top: 1px solid var(--ink-700);
  }

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

  .page-faq .faq-index__link {
    display: flex;
    width: 100%;
    justify-content: flex-start;
    border: 0;
    border-bottom: 1px solid var(--ink-700);
    border-left: 2px solid transparent;
    background: transparent;
    padding: 12px 10px;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    color: var(--cyan-200);
    background: rgba(59, 240, 200, .05);
    border-left-color: var(--cyan-400);
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-body__grid {
    grid-template-columns: 260px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__a {
    animation: none;
  }

  .page-faq .qa__q::after,
  .page-faq .qa,
  .page-faq .faq-jump__link,
  .page-faq .faq-index__link {
    transition: none;
  }
}