.page-faq {
  --faq-line: rgba(155, 176, 211, 0.16);
  --faq-panel: rgba(27, 49, 89, 0.55);
  --faq-cyan-soft: rgba(79, 209, 197, 0.08);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .kb-top {
  position: relative;
  padding: 28px 0 8px;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 8% -20%, rgba(79, 209, 197, 0.13), transparent 58%),
    radial-gradient(90% 70% at 100% 0%, rgba(255, 107, 53, 0.10), transparent 60%),
    linear-gradient(180deg, var(--nt-night) 0%, var(--nt-deep) 100%);
}

.page-faq .kb-top::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(155, 176, 211, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155, 176, 211, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.75;
}

.page-faq .kb-top .nt-shell {
  position: relative;
  z-index: 1;
}

.page-faq .kb-hero {
  display: grid;
  gap: 30px;
  padding: 22px 0 52px;
}

.page-faq .kb-hero__title {
  margin: 14px 0 0;
  font-size: clamp(1.85rem, 6.2vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--nt-mist);
}

.page-faq .kb-hero__lede {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--nt-silver);
}

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

.page-faq .kb-hero__stats {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
  border-radius: var(--nt-r-md);
  overflow: hidden;
}

.page-faq .kb-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(16, 31, 60, 0.85);
}

.page-faq .kb-stat dt {
  font-family: var(--nt-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--nt-silver);
}

.page-faq .kb-stat dd {
  margin: 0;
  font-family: var(--nt-mono);
  font-size: 0.94rem;
  color: var(--nt-gold);
  text-align: right;
}

/* ---------- 主体骨架 ---------- */
.page-faq .kb-body {
  padding: 56px 0 68px;
  background: var(--nt-deep);
}

.page-faq .kb-body__title {
  margin: 0 0 30px;
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  line-height: 1.32;
  font-weight: 700;
  color: var(--nt-mist);
  max-width: 24ch;
}

.page-faq .kb-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

/* ---------- 左侧编号索引 ---------- */
.page-faq .kb-index {
  min-width: 0;
}

.page-faq .kb-index__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-faq .kb-index__cat {
  border-top: 1px solid var(--faq-line);
  padding-top: 14px;
}

.page-faq .kb-index__catlink {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 4px 2px;
  text-decoration: none;
  color: var(--nt-mist);
  font-size: 1rem;
  font-weight: 700;
  transition: color 200ms var(--nt-ease);
}

.page-faq .kb-index__catlink:hover .kb-index__catname,
.page-faq .kb-index__catlink:focus-visible .kb-index__catname {
  color: var(--nt-cyan);
}

.page-faq .kb-index__no {
  flex: none;
  font-family: var(--nt-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--nt-orange);
  border: 1px solid rgba(255, 107, 53, 0.5);
  border-radius: 999px;
  padding: 2px 9px;
}

.page-faq .kb-index__count {
  margin-left: auto;
  flex: none;
  font-family: var(--nt-mono);
  font-size: 0.7rem;
  color: var(--nt-silver);
}

.page-faq .kb-index__sub {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .kb-index__q {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 8px 7px 11px;
  border-left: 2px solid transparent;
  text-decoration: none;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--nt-silver);
  transition: color 200ms var(--nt-ease), border-color 200ms var(--nt-ease), background 200ms var(--nt-ease);
}

.page-faq .kb-index__q:hover,
.page-faq .kb-index__q:focus-visible {
  color: var(--nt-mist);
  border-left-color: var(--nt-cyan);
  background: var(--faq-cyan-soft);
}

.page-faq .kb-index__qno {
  flex: none;
  font-family: var(--nt-mono);
  font-size: 0.7rem;
  color: var(--nt-gold);
}

.page-faq .kb-index__media {
  margin: 28px 0 0;
}

.page-faq .kb-index__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 右侧答案区 ---------- */
.page-faq .kb-answers {
  display: grid;
  gap: 52px;
  min-width: 0;
}

.page-faq .kb-group {
  scroll-margin-top: 140px;
  min-width: 0;
}

.page-faq .kb-group__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .kb-group__no {
  flex: none;
  font-family: var(--nt-mono);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--nt-orange);
}

.page-faq .kb-group__title {
  margin: 0;
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  font-weight: 700;
  color: var(--nt-mist);
}

.page-faq .kb-group__intro {
  margin: 14px 0 6px;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--nt-silver);
}

.page-faq .kb-inline-media {
  margin: 20px 0 6px;
  max-width: 400px;
}

.page-faq .kb-inline-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 手风琴 ---------- */
.page-faq .kb-accordion {
  margin-top: 8px;
}

.page-faq .kb-item {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .kb-item__q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 19px 38px 19px 0;
  cursor: pointer;
  list-style: none;
  font-size: 0.99rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--nt-mist);
  transition: color 220ms var(--nt-ease);
}

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

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

.page-faq .kb-item__q::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--nt-cyan);
  border-bottom: 2px solid var(--nt-cyan);
  transform: rotate(45deg);
  transition: transform 260ms var(--nt-ease);
}

.page-faq .kb-item[open] .kb-item__q::after {
  transform: rotate(-135deg);
  top: 28px;
}

.page-faq .kb-item__q:hover {
  color: var(--nt-cyan);
}

.page-faq .kb-item__q:focus-visible {
  outline: 2px solid var(--nt-cyan);
  outline-offset: 4px;
  border-radius: var(--nt-r-sm);
}

.page-faq .kb-item__n {
  flex: none;
  font-family: var(--nt-mono);
  font-size: 0.74rem;
  color: var(--nt-gold);
}

.page-faq .kb-item__a {
  padding: 0 0 22px 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--nt-silver);
  animation: kb-fade-in 300ms var(--nt-ease) both;
}

.page-faq .kb-item__a p {
  margin: 0 0 12px;
}

.page-faq .kb-item__a p:last-of-type {
  margin-bottom: 0;
}

.page-faq .kb-quote {
  margin: 14px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--nt-cyan);
  border-radius: 0 var(--nt-r-sm) var(--nt-r-sm) 0;
  background: var(--faq-cyan-soft);
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--nt-mist);
}

.page-faq .kb-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-steps li {
  font-family: var(--nt-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--nt-mist);
  background: var(--faq-panel);
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  padding: 5px 11px;
}

.page-faq .kb-copy {
  margin-top: 16px;
  font-size: 0.8rem;
}

@keyframes kb-fade-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 收尾 ---------- */
.page-faq .kb-foot {
  padding: 0 0 72px;
  background: var(--nt-deep);
}

.page-faq .kb-foot__panel {
  display: grid;
  gap: 26px;
  padding: 32px 24px;
  border: 1px solid var(--faq-line);
  border-radius: var(--nt-r-lg);
  background:
    linear-gradient(135deg, rgba(27, 49, 89, 0.85) 0%, rgba(16, 31, 60, 0.9) 60%, rgba(10, 20, 40, 0.95) 100%);
}

.page-faq .kb-foot__title {
  margin: 12px 0 0;
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--nt-mist);
}

.page-faq .kb-foot__desc {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--nt-silver);
}

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

.page-faq .kb-top-link {
  display: inline-block;
  margin-top: 24px;
  font-family: var(--nt-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--nt-silver);
  text-decoration: none;
  border-bottom: 1px dashed rgba(155, 176, 211, 0.4);
  padding-bottom: 2px;
  transition: color 200ms var(--nt-ease), border-color 200ms var(--nt-ease);
}

.page-faq .kb-top-link:hover,
.page-faq .kb-top-link:focus-visible {
  color: var(--nt-cyan);
  border-bottom-color: var(--nt-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .kb-item__a {
    padding-left: 40px;
    padding-right: 24px;
  }

  .page-faq .kb-item__q {
    font-size: 1.04rem;
  }

  .page-faq .kb-foot__panel {
    padding: 40px 40px;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-faq .kb-foot__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-faq .kb-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    padding: 26px 0 62px;
  }
}

@media (min-width: 980px) {
  .page-faq .kb-body {
    padding: 72px 0 88px;
  }

  .page-faq .kb-body__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 56px;
  }

  .page-faq .kb-index {
    position: sticky;
    top: 118px;
    align-self: start;
  }

  .page-faq .kb-answers {
    gap: 64px;
  }
}

@media (min-width: 1200px) {
  .page-faq .kb-body__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 72px;
  }
}

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

  .page-faq .kb-item__q::after,
  .page-faq .kb-index__q,
  .page-faq .kb-index__catlink,
  .page-faq .kb-top-link {
    transition: none;
  }
}