.page-faq {
  --faq-rail: 192px;
  --faq-gap: clamp(22px, 3.2vw, 46px);
  --faq-hair: rgba(127, 163, 184, .22);
  --faq-hair-strong: rgba(34, 211, 238, .38);
  padding-bottom: clamp(52px, 8vw, 104px);
}

.page-faq .faq-crumb {
  margin: 0 0 10px;
  font-size: var(--fs-micro);
}

.page-faq .faq-hero {
  padding-top: clamp(10px, 2vw, 22px);
  border-bottom: 1px solid var(--line);
  padding-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .faq-hero__label {
  color: var(--cyan);
  margin: 0;
}

.page-faq .faq-hero h1 {
  margin: 12px 0 16px;
  max-width: 20em;
  font-size: var(--fs-h1);
  line-height: 1.24;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-lead {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--mist);
}

.page-faq .faq-meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: 22px 0 0;
  padding: 0;
  font-size: var(--fs-micro);
  letter-spacing: .06em;
  color: var(--muted);
}

.page-faq .faq-meta__num {
  color: var(--cyan);
  letter-spacing: .08em;
}

.page-faq .faq-meta .mono {
  color: var(--mist);
}

/* --- 双栏骨架 --- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: clamp(24px, 3.6vw, 44px);
}

.page-faq .faq-rail {
  padding: 14px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass-soft);
}

.page-faq .faq-rail__label {
  margin: 0;
  color: var(--muted);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 9px;
  border-left: 2px solid transparent;
  border-radius: 8px;
  color: var(--mist);
  font-size: var(--fs-small);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--paper);
  background: var(--glass);
  border-left-color: var(--cyan);
  outline: none;
}

.page-faq .faq-rail__num {
  color: var(--cyan);
  font-size: var(--fs-label);
  letter-spacing: .1em;
}

.page-faq .faq-rail__count {
  color: var(--muted);
  font-size: var(--fs-micro);
}

.page-faq .faq-rail__cross {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-rail__cross .label {
  width: 100%;
  color: var(--muted);
}

.page-faq .faq-rail__cross a {
  color: var(--cyan);
  font-size: var(--fs-small);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, .32);
  padding-bottom: 1px;
}

.page-faq .faq-rail__cross a:hover,
.page-faq .faq-rail__cross a:focus-visible {
  border-bottom-color: var(--cyan);
}

@media (min-width: 1040px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: var(--faq-gap);
  }

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

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .faq-rail__text {
    flex: 1 1 auto;
  }
}

/* --- 分组 --- */
.page-faq .faq-body {
  min-width: 0;
}

.page-faq .faq-group {
  padding-top: clamp(24px, 3.2vw, 38px);
  margin-top: clamp(24px, 3.2vw, 38px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 16px;
}

.page-faq .faq-group__num {
  font-size: clamp(1.5rem, 2.4vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
  opacity: .8;
  letter-spacing: .04em;
}

.page-faq .faq-group__title {
  margin: 0 0 6px;
  font-size: var(--fs-h2);
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--muted);
}

/* --- 折叠面板 --- */
.page-faq .faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--faq-hair);
}

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

.page-faq .fold__btn {
  display: flex;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  padding: 16px 12px 16px 14px;
  border: 0;
  border-left: 2px solid transparent;
  background: none;
  font: inherit;
  text-align: left;
  color: var(--paper);
  cursor: pointer;
  transition: background-color .18s ease, border-color .18s ease;
}

.page-faq .fold__btn:hover {
  background: var(--glass-soft);
}

.page-faq .fold__btn:focus-visible {
  outline: 1px solid var(--line-strong);
  outline-offset: 2px;
}

.page-faq .fold__btn[aria-expanded="true"] {
  border-left-color: var(--cyan);
  background: var(--glass-soft);
}

.page-faq .faq-item__idx {
  flex: none;
  font-size: var(--fs-label);
  letter-spacing: .1em;
  color: var(--muted);
}

.page-faq .fold__q {
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--fs-body);
  font-weight: 600;
  line-height: 1.7;
}

.page-faq .fold__sign {
  position: relative;
  flex: none;
  align-self: center;
  width: 12px;
  height: 12px;
}

.page-faq .fold__sign::before,
.page-faq .fold__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--ridge);
  transition: opacity .18s ease, background-color .18s ease;
}

.page-faq .fold__sign::before {
  width: 12px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.page-faq .fold__sign::after {
  width: 1px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.page-faq .fold__btn[aria-expanded="true"] .fold__sign::after {
  opacity: 0;
}

.page-faq .fold__btn[aria-expanded="true"] .fold__sign::before {
  background: var(--cyan);
}

.page-faq .faq-item .fold__panel {
  padding: 0 14px 20px 46px;
  font-size: .95rem;
  line-height: var(--lh-body);
  color: var(--mist);
}

.page-faq .faq-answer {
  margin: 0 0 10px;
  max-width: 34em;
}

.page-faq .faq-basis {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-small);
  color: var(--muted);
}

.page-faq .faq-conclusion {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  color: var(--cyan);
  vertical-align: 1px;
}

.page-faq .faq-conclusion--basis {
  border-color: var(--faq-hair);
  color: var(--muted);
}

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

.page-faq .faq-item .ledger-tag {
  vertical-align: 1px;
}

/* --- 配图 --- */
.page-faq .faq-fig {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

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

.page-faq .faq-fig figcaption {
  padding: 10px 14px;
  font-size: var(--fs-micro);
  letter-spacing: .05em;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--faq-hair);
}

@media (min-width: 720px) {
  .page-faq .faq-item .fold__panel {
    padding-right: 24px;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-item .fold__btn {
    padding: 14px 8px 14px 10px;
  }

  .page-faq .faq-item .fold__panel {
    padding: 0 10px 18px 34px;
  }

  .page-faq .fold__q {
    font-size: .96rem;
  }

  .page-faq .faq-fig img {
    aspect-ratio: 4 / 3;
  }
}

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