.page-faq {
  --faq-rail-w: 180px;
  --faq-line: rgba(126, 154, 147, .22);
  --faq-lede: rgba(242, 247, 245, .76);
  --faq-answer: rgba(242, 247, 245, .74);
  padding-bottom: 92px;
  background: var(--ink);
  color: var(--white);
}

.page-faq .breadcrumbs {
  padding-top: calc(var(--top-pad) + 26px);
}

.page-faq .breadcrumbs ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-faq .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--hair-gold);
}

.page-faq .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
}

.page-faq .breadcrumbs a:hover,
.page-faq .breadcrumbs a:focus-visible {
  color: var(--lime);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-masthead {
  position: relative;
  padding: 30px 0 46px;
  isolation: isolate;
}

.page-faq .faq-masthead::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -60px;
  right: -14%;
  bottom: 10%;
  left: -30px;
  background:
    radial-gradient(58% 78% at 10% 0%, rgba(168, 255, 62, .13), transparent 70%),
    radial-gradient(70% 90% at 88% 18%, rgba(15, 59, 74, .55), transparent 72%);
  pointer-events: none;
}

.page-faq .faq-masthead h1 {
  margin: 16px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 6.4vw, 3.3rem);
  line-height: 1.1;
  letter-spacing: -.012em;
}

.page-faq .faq-masthead__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--faq-lede);
}

.page-faq .faq-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--hair-gold);
  list-style: none;
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-faq .faq-facts li {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.page-faq .faq-facts .num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0;
  color: var(--lime);
}

/* ---------- 骨架：索引 + 问答流 ---------- */

.page-faq .faq-shell {
  display: grid;
  gap: 34px;
}

@media (min-width: 1060px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    column-gap: 56px;
    align-items: start;
  }
}

.page-faq .faq-rail {
  padding-bottom: 6px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .faq-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 0;
  font-size: .86rem;
  color: var(--white);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-faq .faq-rail__link .num {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--mist);
  transition: color .18s var(--ease);
}

.page-faq .faq-rail__link::before {
  content: "";
  flex: none;
  width: 12px;
  height: 2px;
  background: var(--mist);
  transition: width .2s var(--ease), background .2s 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 {
  width: 22px;
  background: var(--lime);
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

@media (min-width: 1060px) {
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--bar-h-tight) + 30px);
    padding-bottom: 0;
    border-bottom: 0;
  }

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

  .page-faq .faq-rail__link {
    padding: 10px 0;
    border-bottom: 1px solid var(--faq-line);
  }
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  padding-bottom: 44px;
}

.page-faq .faq-group + .faq-group {
  padding-top: 44px;
  border-top: 1px solid var(--hair-gold);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  align-items: baseline;
  margin-bottom: 22px;
}

.page-faq .faq-group__idx {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.28rem, 4vw, 1.9rem);
  letter-spacing: .012em;
  line-height: 1.25;
}

.page-faq .faq-group__note {
  grid-column: 1 / -1;
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 图形 ---------- */

.page-faq .faq-figure {
  margin: 0 0 26px;
}

.page-faq .faq-figure .media-frame {
  border-radius: var(--radius-l);
  overflow: hidden;
}

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

.page-faq .faq-figure__cap {
  margin: 10px 0 0;
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  border-top: 1px solid var(--faq-line);
}

.page-faq .qa {
  border-bottom: 1px solid var(--faq-line);
  transition: background .2s var(--ease);
}

.page-faq .qa[open] {
  background: linear-gradient(90deg, rgba(168, 255, 62, .07), rgba(168, 255, 62, 0) 68%);
}

.page-faq .qa summary {
  position: relative;
  padding: 17px 46px 17px 14px;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.62;
  color: var(--white);
  cursor: pointer;
  list-style: none;
  transition: color .18s var(--ease);
}

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

.page-faq .qa summary:hover {
  color: var(--lime);
}

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-faq .qa summary::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 18px;
  width: 9px;
  height: 9px;
  margin-top: -6px;
  border-right: 2px solid var(--mist);
  border-bottom: 2px solid var(--mist);
  transform: rotate(45deg);
  transition: transform .22s var(--ease), border-color .22s var(--ease), margin-top .22s var(--ease);
}

.page-faq .qa[open] summary::after {
  margin-top: -2px;
  transform: rotate(-135deg);
  border-color: var(--lime);
}

.page-faq .qa__a {
  padding: 0 46px 20px 14px;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 66ch;
  font-size: .94rem;
  line-height: 1.88;
  color: var(--faq-answer);
}

.page-faq .qa__a .num {
  font-family: var(--font-mono);
  color: var(--lime);
}

/* ---------- 术语表 ---------- */

.page-faq .gloss-grid {
  display: grid;
  gap: 0 44px;
  margin: 0;
}

@media (min-width: 720px) {
  .page-faq .gloss-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq .gloss {
  padding: 15px 0;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .gloss dt {
  font-family: var(--font-display);
  font-size: .98rem;
  letter-spacing: .06em;
  color: var(--white);
}

.page-faq .gloss dd {
  margin: 7px 0 0;
  font-size: .85rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 出口 ---------- */

.page-faq .faq-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding-top: 34px;
  border-top: 1px solid var(--hair-gold);
}

.page-faq .faq-next__lead {
  margin: 0 8px 0 0;
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--mist);
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa summary,
  .page-faq .qa summary::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-rail__link::before {
    transition: none;
  }
}