.page-faq {
  --faq-rail: 264px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: clamp(22px, 4vw, 46px) 0 10px;
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-faq .breadcrumbs__link {
  color: var(--muted);
  text-decoration: none;
  transition: color .24s ease;
}

.page-faq .breadcrumbs__link:hover,
.page-faq .breadcrumbs__link:focus-visible {
  color: var(--cyan);
}

.page-faq .breadcrumbs__sep {
  color: var(--line);
}

.page-faq .breadcrumbs__item {
  color: var(--text);
}

.page-faq .faq-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  max-width: 18em;
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-hero__lead {
  margin: 0 0 24px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  padding: 16px 0;
  margin-bottom: 22px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.page-faq .faq-hero__stat b {
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--amber);
}

/* ---------- 关键词过滤 ---------- */

.page-faq .faq-search {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-search__mark {
  flex: none;
  padding: 4px 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--cyan);
  border: 1px solid rgba(34, 224, 214, .4);
}

.page-faq .faq-search .searchfield__input {
  flex: 1 1 240px;
  min-width: 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-size: 15px;
  padding: 8px 2px;
  outline: none;
}

.page-faq .faq-search .searchfield__input:focus-visible {
  border-bottom-color: var(--cyan);
  box-shadow: 0 1px 0 0 var(--cyan);
}

.page-faq .faq-search .searchfield__hint {
  flex: 0 1 auto;
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
}

.page-faq .filtercount {
  margin: 12px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 两列骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding-bottom: clamp(40px, 7vw, 72px);
}

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

/* ---------- 左侧分组目录 ---------- */

.page-faq .faq-index {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  border-image: var(--grad) 1;
  border-image-slice: 0 0 0 1;
  padding: 20px 18px 16px;
}

.page-faq .faq-index__kicker {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 3px;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 9px 8px;
  border-left: 2px solid var(--line);
  color: var(--text);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .24s ease, background-color .24s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--cyan);
  background: rgba(34, 224, 214, .07);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
}

.page-faq .faq-index__num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--amber);
}

.page-faq .faq-index__name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-faq .faq-index__count {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
}

.page-faq .faq-index__foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-index__cta {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, .4);
  transition: border-color .24s ease;
}

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

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  margin: 0 0 clamp(32px, 5vw, 52px);
  scroll-margin-top: 132px;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding-bottom: 12px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
  transition: border-color .24s ease;
}

.page-faq .faq-group:target .faq-group__head {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-group__num {
  padding: 3px 8px;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-group__note {
  flex: 1 1 220px;
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 问答折叠块 ---------- */

.page-faq .qa {
  position: relative;
  margin-bottom: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--grad);
  opacity: .3;
  transition: opacity .24s ease;
}

.page-faq .qa[open]::before {
  opacity: 1;
}

.page-faq .qa > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  padding: 15px 16px 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--text);
  transition: background-color .24s ease, color .24s ease;
}

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

.page-faq .qa > summary:hover {
  background: rgba(34, 224, 214, .06);
}

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

.page-faq .qa__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan);
  background: transparent;
  border: 1px solid rgba(34, 224, 214, .5);
  border-radius: 2px;
  transition: background-color .24s ease, color .24s ease;
}

.page-faq .qa[open] .qa__mark {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-faq .qa__q {
  min-width: 0;
  font-weight: 600;
  overflow-wrap: break-word;
}

.page-faq .qa__caret {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 5px;
  color: var(--muted);
  transition: color .24s ease;
}

.page-faq .qa__caret::before,
.page-faq .qa__caret::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform .24s ease;
}

.page-faq .qa__caret::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-faq .qa__caret::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-faq .qa[open] .qa__caret {
  color: var(--cyan);
}

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

.page-faq .qa__body {
  padding: 0 16px 16px 52px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .qa[open] .qa__body {
  animation: faq-open .24s ease-out;
}

.page-faq .qa__body p {
  margin: 0 0 8px;
}

.page-faq .qa__body p:last-of-type {
  margin-bottom: 0;
}

.page-faq .qa__anchor {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--line);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color .24s ease, border-color .24s ease;
}

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

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 章节配图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 18px;
  padding: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) brightness(.86);
}

.page-faq .faq-figure--matrix img {
  aspect-ratio: 12 / 7;
}

.page-faq .faq-figure--flow img {
  aspect-ratio: 2 / 1;
}

.page-faq .faq-figure figcaption {
  padding: 10px 4px 3px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 页尾引导 ---------- */

.page-faq .faq-next {
  padding: 0 0 clamp(44px, 7vw, 80px);
}

.page-faq .faq-next__panel {
  padding: clamp(24px, 4vw, 40px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid transparent;
  border-image: var(--grad) 1;
  border-image-slice: 1 0 0 0;
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-next__title {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-faq .faq-next__lead {
  margin: 0 0 20px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  overflow-wrap: break-word;
}

.page-faq .faq-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-search .searchfield__hint {
    margin-left: auto;
  }

  .page-faq .faq-index__list {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 132px;
  }
}

@media (max-width: 719px) {
  .page-faq .faq-index__list {
    grid-template-columns: 1fr 1fr;
  }

  .page-faq .faq-index__name {
    white-space: normal;
  }

  .page-faq .qa__body {
    padding-left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa__body {
    animation: none;
  }

  .page-faq .qa__caret::before,
  .page-faq .qa__caret::after,
  .page-faq .qa > summary,
  .page-faq .qa__mark,
  .page-faq .qa::before,
  .page-faq .faq-index__link,
  .page-faq .faq-group__head {
    transition: none;
  }
}