.page-faq {
  --faq-rail: 156px;
  --faq-body: #C9DCD4;
  --faq-measure: 68ch;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #0A1B15 0%, var(--ink) 82%);
}
.page-faq .faq-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
  filter: saturate(.7);
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--signal) 0%, rgba(53, 242, 200, .1) 38%, transparent 70%);
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(40px, 6vw, 84px);
  padding-bottom: clamp(36px, 5vw, 68px);
}
.page-faq .faq-hero .breadcrumbs {
  margin-bottom: 22px;
}
.page-faq .faq-hero .eyebrow {
  color: var(--signal);
}
.page-faq .faq-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(32px, 5.6vw, 64px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper);
  margin: .35em 0 .5em;
  max-width: 15ch;
}
.page-faq .faq-hero .lede {
  max-width: 54ch;
  color: var(--faq-body);
  font-size: 16px;
  line-height: 1.9;
}
.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 34px;
  list-style: none;
  margin: 30px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}
.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
}
.page-faq .faq-hero__facts .num {
  font-size: 24px;
  color: var(--signal);
  line-height: 1;
}
.page-faq .faq-hero__facts .unit {
  font-size: 12px;
  color: var(--muted);
}
.page-faq .faq-hero__facts em {
  font-style: normal;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--muted);
  margin-left: 4px;
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-filter {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(7, 19, 15, .94);
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}
.page-faq .faq-filter__row {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-faq .faq-filter__row::-webkit-scrollbar {
  display: none;
}
.page-faq .faq-filter .filter-btn {
  flex: 0 0 auto;
}
.page-faq .faq-filter .filter-btn[aria-pressed="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}
.page-faq .faq-filter .filter-count {
  flex: 0 0 auto;
  margin-left: auto;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

/* 左侧分类刻度 */
.page-faq .faq-scale {
  display: none;
}
.page-faq .faq-scale__title {
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.page-faq .faq-scale__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 0 9px 12px;
  border-left: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}
.page-faq .faq-scale__item span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--stroke);
  transition: color .16s var(--ease);
}
.page-faq .faq-scale__item:hover,
.page-faq .faq-scale__item:focus-visible {
  color: var(--signal);
  border-left-color: var(--signal);
  background: rgba(53, 242, 200, .05);
}
.page-faq .faq-scale__item:hover span,
.page-faq .faq-scale__item:focus-visible span {
  color: var(--signal);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding-bottom: clamp(34px, 4.5vw, 64px);
  scroll-margin-top: 84px;
}
.page-faq .faq-group.is-in {
  animation: faq-fade .16s var(--ease) both;
}
@keyframes faq-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}
.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
  margin-bottom: 4px;
}
.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
  letter-spacing: .08em;
}
.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(21px, 2.6vw, 30px);
  letter-spacing: -.01em;
  color: var(--paper);
}

/* ---------- 单条问答 ---------- */
.page-faq .qa {
  position: relative;
  border-bottom: 1px solid var(--line);
}
.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background .18s var(--ease);
}
.page-faq .qa[open]::before {
  background: var(--signal);
}
.page-faq .qa summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding: 19px 42px 19px 18px;
  transition: color .16s var(--ease), background .16s var(--ease);
}
.page-faq .qa summary::-webkit-details-marker {
  display: none;
}
.page-faq .qa summary:hover {
  background: rgba(53, 242, 200, .04);
}
.page-faq .qa summary:hover .qa__q {
  color: var(--signal);
}
.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}
.page-faq .qa__q {
  display: block;
  font-size: clamp(15.5px, 1.6vw, 18px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
  transition: color .16s var(--ease);
}
.page-faq .qa summary::after {
  content: "";
  position: absolute;
  right: 14px;
  top: calc(50% - 5px);
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--signal);
  border-bottom: 1.5px solid var(--signal);
  transform: rotate(45deg);
  transition: transform .2s var(--ease);
}
.page-faq .qa[open] summary::after {
  transform: rotate(-135deg);
}
.page-faq .qa__body {
  padding: 0 42px 22px 18px;
  animation: faq-fade .16s var(--ease) both;
}
.page-faq .qa__body p {
  max-width: var(--faq-measure);
  margin: 0 0 .95em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--faq-body);
}
.page-faq .qa__body p:last-child {
  margin-bottom: 0;
}
.page-faq .qa__body .num {
  font-family: var(--font-mono);
  color: var(--signal);
  background: rgba(53, 242, 200, .1);
  border-radius: 2px;
  padding: 1px 6px;
  font-size: .93em;
}
.page-faq .qa__link {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 200, .45);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.page-faq .qa__link:hover {
  color: var(--signal-soft);
  border-bottom-color: var(--signal-soft);
}

/* ---------- 勘误分组配图 ---------- */
.page-faq .faq-group__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
.page-faq .faq-side {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--block);
  padding: 12px;
}
.page-faq .faq-side img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.85);
}
.page-faq .faq-side figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 底部引导 ---------- */
.page-faq .faq-next {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink) 0%, #0A1B15 100%);
}
.page-faq .faq-next__inner {
  padding-top: clamp(34px, 4.5vw, 60px);
  padding-bottom: clamp(34px, 4.5vw, 60px);
  display: grid;
  gap: 22px;
}
.page-faq .faq-next__text {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--faq-body);
}
.page-faq .faq-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 64px);
    align-items: start;
  }
  .page-faq .faq-scale {
    display: block;
    position: sticky;
    top: 88px;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-group--fix .faq-group__body {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 36px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-group.is-in,
  .page-faq .qa__body {
    animation: none;
  }
  .page-faq .qa summary::after,
  .page-faq .qa::before,
  .page-faq .faq-scale__item {
    transition: none;
  }
}