.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: 26px 42px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(95% 130% at 108% -16%, rgba(139, 92, 255, .22), transparent 58%),
    radial-gradient(70% 110% at -12% 118%, rgba(61, 245, 230, .11), transparent 62%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: .55;
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-faq .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

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

.page-faq .breadcrumbs [aria-current="page"] {
  color: var(--silver);
}

.page-faq .faq-hero__body {
  margin-top: 26px;
  max-width: 780px;
}

.page-faq .faq-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 9vw, 5.2rem);
  line-height: .96;
  letter-spacing: -.03em;
  color: var(--cream);
}

.page-faq .faq-hero__title::after {
  content: "";
  display: block;
  width: 76px;
  height: 6px;
  margin-top: 20px;
  background: var(--red);
}

.page-faq .faq-hero__lead {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.page-faq .faq-jump__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
  text-decoration: none;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .faq-body {
  padding-block: 38px 76px;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

/* 侧栏索引 */
.page-faq .faq-index {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(17, 23, 34, .92), rgba(7, 10, 15, .92));
}

.page-faq .faq-index__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-index__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-faq .faq-index__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__list > li {
  flex: 0 0 auto;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 12px;
  border-bottom: 2px solid transparent;
  font-size: 14px;
  color: var(--silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

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

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gold);
}

/* 问答主列 */
.page-faq .faq-qa {
  display: flex;
  flex-direction: column;
  gap: 44px;
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 78px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "no title"
    ". digest";
  column-gap: 12px;
  row-gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-group__no {
  grid-area: no;
  align-self: center;
  padding: 3px 8px;
  border-radius: var(--radius);
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
}

.page-faq .faq-group__title {
  grid-area: title;
  margin: 0;
  align-self: center;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.4vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.3;
  color: var(--cream);
}

.page-faq .faq-group__digest {
  grid-area: digest;
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

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

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

.page-faq .faq-item > summary {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  min-height: 44px;
  padding: 18px 4px 18px 20px;
  list-style: none;
  cursor: pointer;
  transition: background-color .18s var(--ease);
}

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

.page-faq .faq-item > summary::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 27px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line-strong);
  transition: background-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-faq .faq-item[open] > summary::before {
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(61, 245, 230, .7);
}

.page-faq .faq-item > summary:hover {
  background: rgba(61, 245, 230, .05);
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: var(--radius);
}

.page-faq .faq-item__no {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-faq .faq-item__q {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--cream);
  transition: color .18s var(--ease);
}

.page-faq .faq-item > summary:hover .faq-item__q {
  color: var(--cyan);
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 8px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
  background: var(--cyan);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.page-faq .faq-item__sign::after {
  transform: rotate(90deg);
}

.page-faq .faq-item[open] > summary .faq-item__sign::after {
  transform: rotate(0deg);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 0 4px 22px 20px;
  max-width: 68ch;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 245, 230, .42);
  transition: border-color .18s var(--ease);
}

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

/* 适配章节插图 */
.page-faq .faq-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: rgba(7, 10, 15, .6);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  line-height: 1.75;
  color: var(--mist);
}

/* 右侧短注释 */
.page-faq .faq-margin {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-faq .faq-margin__item {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-margin__no {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--violet);
}

.page-faq .faq-margin__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

/* 平板 */
@media (min-width: 760px) {
  .page-faq .faq-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 34px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 24px;
    padding: 16px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index__list > li {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__list a {
    padding: 0 10px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    white-space: normal;
  }

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

  .page-faq .faq-margin {
    grid-column: 1 / -1;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 22px;
  }

  .page-faq .faq-margin__item {
    flex: 1 1 220px;
  }
}

/* 桌面三栏：索引 / 问答 / 短注释 */
@media (min-width: 1140px) {
  .page-faq .faq-layout {
    grid-template-columns: 240px minmax(0, 1fr) minmax(0, .34fr);
    gap: 40px;
  }

  .page-faq .faq-margin {
    grid-column: auto;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 26px;
    position: sticky;
    top: 34px;
    padding-left: 22px;
    border-left: 1px solid var(--line);
  }

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

@media (max-width: 560px) {
  .page-faq .faq-item__a {
    padding-left: 4px;
  }

  .page-faq .faq-item__q {
    font-size: 15px;
  }

  .page-faq .faq-jump__link {
    font-size: 11px;
    padding: 0 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .breadcrumbs a,
  .page-faq .faq-jump__link,
  .page-faq .faq-index__list a,
  .page-faq .faq-item > summary,
  .page-faq .faq-item__q,
  .page-faq .faq-item > summary::before,
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-item__a a {
    transition: none;
  }
}