.page-faq {
  --faq-line: rgba(155, 179, 168, .2);
  --faq-soft: rgba(242, 247, 244, .78);
  --faq-anchor: rgba(155, 179, 168, .3);
  background: var(--ab-ink);
  color: var(--ab-snow);
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  background:
    radial-gradient(90% 130% at 92% -12%, rgba(79, 224, 192, .15), transparent 60%),
    linear-gradient(174deg, #113329 0%, var(--ab-ink) 92%);
  padding-top: clamp(22px, 3.4vw, 38px);
  padding-bottom: clamp(38px, 5.6vw, 64px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
  margin-top: clamp(22px, 3.4vw, 38px);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.07;
  letter-spacing: -.01em;
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--faq-soft);
}

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

.page-faq .faq-stat {
  flex: 1 1 148px;
  min-width: 0;
  padding: 13px 16px;
  border-radius: var(--ab-radius-md);
  background: rgba(28, 58, 49, .55);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-stat__v {
  display: block;
  font-family: var(--ab-font-mono);
  font-weight: 700;
  font-size: 27px;
  line-height: 1;
  color: var(--ab-lime);
}

.page-faq .faq-stat__k {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ab-muted);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-top: clamp(34px, 5vw, 60px);
}

.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__title {
  display: none;
  margin: 0 0 12px;
  color: var(--ab-muted);
}

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

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

.page-faq .faq-rail__link {
  display: block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--ab-radius-pill);
  background: rgba(28, 58, 49, .5);
  color: var(--ab-muted);
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 180ms var(--ab-ease), background 180ms var(--ab-ease), transform 180ms var(--ab-ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--ab-snow);
  background: rgba(28, 58, 49, .92);
  transform: translateX(2px);
}

.page-faq .faq-rail__link[aria-current] {
  background: var(--ab-lime);
  color: var(--ab-ink);
  font-weight: 700;
}

.page-faq .faq-rail__more {
  display: none;
  margin-top: 18px;
  color: var(--ab-cyan);
  font-size: 13.5px;
  text-decoration: none;
  text-underline-offset: 3px;
}

.page-faq .faq-rail__more:hover {
  color: var(--ab-lime);
  text-decoration: underline;
}

.page-faq .faq-flow {
  display: grid;
  gap: clamp(36px, 5vw, 60px);
  min-width: 0;
}

/* ---------- 问题分组 ---------- */

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: calc(var(--ab-header-h) + 26px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.page-faq .faq-group__head::after {
  content: "";
  flex: 1 1 36px;
  min-width: 28px;
  height: 1px;
  background: linear-gradient(90deg, var(--faq-line), transparent);
}

.page-faq .faq-group__idx {
  flex: 0 0 auto;
  padding: 5px 10px;
  border-radius: var(--ab-radius-pill);
  background: rgba(198, 255, 61, .12);
  color: var(--ab-lime);
  font-family: var(--ab-font-mono);
  font-size: 11.5px;
  line-height: 1;
  letter-spacing: .1em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(19px, 2.5vw, 25px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -.005em;
  color: var(--ab-snow);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: 8px;
}

.page-faq .faq-item {
  position: relative;
  padding-left: 14px;
  border-radius: var(--ab-radius-md);
  background: rgba(28, 58, 49, .42);
  transition: background 200ms var(--ab-ease);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: var(--faq-anchor);
  transition: background 220ms var(--ab-ease);
}

.page-faq .faq-item[open] {
  background: rgba(28, 58, 49, .8);
}

.page-faq .faq-item[open]::before {
  background: var(--ab-lime);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 18px 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.5vw, 16.5px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--ab-snow);
  transition: transform 180ms var(--ab-ease), color 180ms var(--ab-ease);
}

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

.page-faq .faq-item__q:hover {
  transform: translateX(2px);
  color: var(--ab-lime);
}

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

.page-faq .faq-item__q-text {
  min-width: 0;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  margin: 5px 0 0 auto;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  border-radius: 2px;
  background: var(--ab-muted);
  transition: transform 220ms var(--ab-ease), background 220ms var(--ab-ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 6.5px;
  width: 15px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  left: 6.5px;
  top: 0;
  width: 2px;
  height: 15px;
}

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

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
}

.page-faq .faq-item__a {
  padding: 0 18px 18px 16px;
}

.page-faq .faq-item__a p {
  margin: 0;
  padding: 14px 16px;
  border-radius: var(--ab-radius-md);
  border-left: 2px solid rgba(198, 255, 61, .5);
  background: rgba(10, 15, 13, .55);
  font-size: clamp(14px, 1.4vw, 15.5px);
  line-height: 1.82;
  color: var(--faq-soft);
}

.page-faq .faq-item__a a {
  color: var(--ab-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-item__a a:hover {
  color: var(--ab-lime);
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 0 0 16px;
  border-radius: var(--ab-radius-lg);
  overflow: hidden;
  background: var(--ab-panel);
}

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

.page-faq .faq-figure__cap {
  padding: 11px 16px 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ab-muted);
}

/* ---------- 跑道条带 ---------- */

.page-faq .ab-runway {
  margin-bottom: 16px;
  padding: 16px 18px;
  border-radius: var(--ab-radius-lg);
  background: rgba(28, 58, 49, .38);
  border: 1px solid var(--faq-line);
}

.page-faq .ab-runway__row + .ab-runway__row {
  margin-top: 12px;
}

/* ---------- 横向提示带 ---------- */

.page-faq .faq-band {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding: 15px 22px;
  border-radius: var(--ab-radius-pill);
  border: 1px solid rgba(198, 255, 61, .26);
  background: linear-gradient(100deg, rgba(198, 255, 61, .13), rgba(79, 224, 192, .05) 68%, transparent);
}

.page-faq .faq-band__tag {
  flex: 0 0 auto;
  padding: 4px 11px;
  border-radius: var(--ab-radius-pill);
  background: var(--ab-lime);
  color: var(--ab-ink);
  font-family: var(--ab-font-mono);
  font-size: 11.5px;
  line-height: 1;
  letter-spacing: .06em;
}

.page-faq .faq-band__text {
  margin: 0;
  min-width: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--faq-soft);
}

/* ---------- 断点 ---------- */

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 214px) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--ab-header-h) + 24px);
  }

  .page-faq .faq-rail__title {
    display: block;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-rail__link {
    white-space: normal;
    padding: 9px 14px;
    border-radius: var(--ab-radius-md);
  }

  .page-faq .faq-rail__more {
    display: inline-block;
  }
}

@media (min-width: 940px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(268px, .65fr);
    gap: clamp(34px, 5vw, 64px);
    align-items: end;
  }

  .page-faq .faq-hero__stats {
    flex-direction: column;
  }

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

@media (max-width: 639px) {
  .page-faq .faq-band {
    border-radius: var(--ab-radius-md);
    padding: 14px 16px;
    gap: 10px;
  }

  .page-faq .faq-item__a {
    padding: 0 14px 14px 14px;
  }

  .page-faq .faq-item__q {
    padding: 14px 14px 14px 14px;
  }
}