.page-faq {
  --faq-rail: 200px;
  --faq-soft-line: rgba(27, 46, 77, 0.55);
  --faq-pulse-wash: rgba(55, 230, 206, 0.09);
  --faq-index-wash: rgba(138, 123, 255, 0.14);
  display: block;
  background: var(--pb-ink-950);
  color: var(--pb-paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 30px 0 44px;
  border-bottom: 1px solid var(--pb-line);
  background-color: var(--pb-ink-950);
  background-image:
    linear-gradient(var(--faq-soft-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--faq-soft-line) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: -1px -1px;
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 82% 8%, var(--faq-index-wash), transparent 58%),
    radial-gradient(circle at 4% 96%, var(--faq-pulse-wash), transparent 52%);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-faq .faq-hero__eyebrow {
  margin: 20px 0 10px;
}

.page-faq .faq-hero__title {
  margin: 0 0 16px;
  font-size: clamp(27px, 5.4vw, 46px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  max-width: 15em;
}

.page-faq .faq-hero__lead {
  margin: 0 0 12px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--pb-paper);
}

.page-faq .faq-hero__note {
  margin: 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--pb-ash);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--pb-line);
  background: var(--pb-line);
}

.page-faq .faq-stats__item {
  background: var(--pb-ink-900);
  padding: 14px 12px;
}

.page-faq .faq-stats__num {
  display: block;
  font-family: var(--pb-font-mono);
  font-size: 26px;
  line-height: 1.05;
  color: var(--pb-signal);
}

.page-faq .faq-stats__label {
  display: block;
  margin-top: 7px;
  font-size: 11px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--pb-ash);
}

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

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--pb-line);
  background: var(--pb-ink-900);
}

.page-faq .faq-hero__figure .pb-figure__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--pb-ash);
}

/* ---------- 主题索引 ---------- */
.page-faq .faq-index {
  padding: 46px 0 54px;
  border-top: 1px solid var(--pb-line);
}

.page-faq .faq-index__title {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 28px);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--pb-line);
  border: 1px solid var(--pb-line);
}

.page-faq .faq-index__link {
  display: flex;
  flex-direction: column;
  gap: 7px;
  height: 100%;
  padding: 16px 14px 15px;
  background: var(--pb-ink-900);
  color: var(--pb-paper);
  text-decoration: none;
  transition: background 0.2s var(--pb-ease);
}

.page-faq .faq-index__num {
  font-family: var(--pb-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--pb-index);
  transition: color 0.2s var(--pb-ease);
}

.page-faq .faq-index__name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-faq .faq-index__desc {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--pb-ash);
}

.page-faq .faq-index__count {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--pb-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--pb-pulse);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: rgba(55, 230, 206, 0.08);
}

.page-faq .faq-index__link:hover .faq-index__num,
.page-faq .faq-index__link:focus-visible .faq-index__num {
  color: var(--pb-pulse);
}

.page-faq .faq-index__link:focus-visible,
.page-faq .faq-rail__link:focus-visible,
.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--pb-pulse);
  outline-offset: 2px;
}

/* ---------- 主体：编号列 + 问答 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 32px;
  padding: 44px 0 56px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--pb-ash);
}

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 11px;
  border: 1px solid var(--pb-line);
  background: var(--pb-ink-900);
  color: var(--pb-ash);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.2s var(--pb-ease), border-color 0.2s var(--pb-ease);
}

.page-faq .faq-rail__num {
  font-family: var(--pb-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--pb-index);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--pb-pulse);
  border-color: var(--pb-pulse);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--pb-header-h) + 20px);
}

.page-faq .faq-group + .faq-group {
  margin-top: 44px;
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  display: block;
  height: 9px;
  margin-bottom: 32px;
  background-image: repeating-linear-gradient(90deg, var(--pb-line) 0 1px, transparent 1px 13px);
}

.page-faq .faq-group__head {
  position: relative;
  padding-bottom: 14px;
  margin-bottom: 4px;
  border-bottom: 2px solid var(--pb-line);
}

.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 62px;
  height: 2px;
  background: var(--pb-pulse);
}

.page-faq .faq-group__num {
  margin: 0 0 6px;
  font-family: var(--pb-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--pb-index);
}

.page-faq .faq-group__title {
  margin: 0 0 8px;
  font-size: clamp(20px, 3.2vw, 26px);
  line-height: 1.3;
}

.page-faq .faq-group__desc {
  margin: 0;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--pb-ash);
}

.page-faq .faq-figure {
  margin: 20px 0 6px;
  max-width: 380px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--pb-line);
  background: var(--pb-ink-900);
}

.page-faq .faq-figure .pb-figure__caption {
  margin-top: 9px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--pb-ash);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--pb-line);
}

.page-faq .faq-item__summary {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 15px 0;
  list-style: none;
  cursor: pointer;
  color: var(--pb-paper);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.65;
  transition: color 0.2s var(--pb-ease);
}

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

.page-faq .faq-item__summary:hover {
  color: var(--pb-pulse);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 10px;
  background: var(--pb-line);
  transition: background 0.2s var(--pb-ease);
}

.page-faq .faq-item[open] .faq-item__dot {
  background: var(--pb-pulse);
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 13px;
  height: 13px;
  margin-top: 7px;
  margin-left: auto;
  border: 1px solid var(--pb-line);
  transition: border-color 0.2s var(--pb-ease);
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--pb-ash);
  transition: opacity 0.2s var(--pb-ease), background 0.2s var(--pb-ease);
}

.page-faq .faq-item__mark::before {
  left: 2px;
  right: 2px;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .faq-item__mark::after {
  top: 2px;
  bottom: 2px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--pb-pulse);
}

.page-faq .faq-item[open] .faq-item__mark::before {
  background: var(--pb-pulse);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 0 0 17px 17px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--pb-ash);
}

.page-faq .faq-item__a p {
  margin: 0 0 9px;
  max-width: 40em;
}

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

.page-faq .faq-item__a a {
  color: var(--pb-pulse);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__a a:hover {
  color: var(--pb-paper);
}

/* ---------- 底部人工渠道条带 ---------- */
.page-faq .faq-assist {
  padding: 0 0 56px;
}

.page-faq .faq-assist__inner {
  display: grid;
  gap: 22px;
  padding: 26px 18px;
  border: 1px solid var(--pb-pulse);
  background:
    linear-gradient(118deg, rgba(55, 230, 206, 0.11), rgba(12, 21, 38, 0.42) 62%);
}

.page-faq .faq-assist__title {
  margin: 8px 0 10px;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.3;
}

.page-faq .faq-assist__text {
  margin: 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--pb-ash);
}

.page-faq .faq-assist__channels {
  display: grid;
  gap: 1px;
  align-self: start;
  background: var(--pb-line);
  border: 1px solid var(--pb-line);
}

.page-faq .faq-assist__channel {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 3px 12px;
  padding: 11px 13px;
  background: var(--pb-ink-950);
}

.page-faq .faq-assist__channel span {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pb-ash);
}

.page-faq .faq-assist__channel strong {
  font-family: var(--pb-font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--pb-paper);
  word-break: break-word;
}

.page-faq .faq-assist__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

  .page-faq .faq-figure {
    max-width: 440px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 48px 0 56px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 56px;
  }

  .page-faq .faq-hero__figure {
    margin-top: 46px;
  }

  .page-faq .faq-index {
    padding: 56px 0 62px;
  }

  .page-faq .faq-index__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-faq .faq-assist__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 26px 48px;
    padding: 34px 30px;
    align-items: start;
  }

  .page-faq .faq-assist__actions {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding: 56px 0 64px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--pb-header-h) + 26px);
    align-self: start;
  }

  .page-faq .faq-rail__title {
    padding-bottom: 10px;
    border-bottom: 1px solid var(--pb-line);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-faq .faq-rail__link {
    padding: 11px 0;
    border: 0;
    border-bottom: 1px solid var(--pb-line);
    background: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-index__num,
  .page-faq .faq-item__summary,
  .page-faq .faq-item__dot,
  .page-faq .faq-item__mark,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-rail__link {
    transition: none;
  }
}