.page-faq {
  --faq-rail-w: 218px;
  --faq-rail-gap: 44px;
  --faq-num: 46px;
}

.page-faq .breadcrumb {
  padding-top: 24px;
}

/* ===== 首屏 ===== */
.page-faq .faq-masthead {
  position: relative;
  margin-top: 20px;
  padding: 38px 24px 34px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
  overflow: hidden;
}

.page-faq .faq-masthead::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 96px;
  height: 4px;
  background: var(--neon);
}

.page-faq .faq-masthead::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 220px;
  height: 220px;
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: .5;
  pointer-events: none;
}

.page-faq .eyebrow {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-faq h1 {
  margin: 0 0 18px;
  font-family: var(--f-display);
  font-size: clamp(34px, 7vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-faq .faq-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-metrics .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-metrics .stat-value {
  font-family: var(--f-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--paper);
}

.page-faq .faq-metrics .stat:first-child .stat-value {
  color: var(--neon);
}

.page-faq .faq-metrics .stat-label {
  font-size: 12px;
  color: var(--text-soft);
}

/* ===== 主体布局 ===== */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding: 40px 0 76px;
}

.page-faq .faq-rail {
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
}

.page-faq .faq-rail-title {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.page-faq .faq-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 8px 14px 8px 10px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  background: rgba(43, 49, 56, .35);
  transition: border-color .18s ease, color .18s ease, background .18s ease;
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  border-color: var(--neon);
  color: var(--neon);
}

.page-faq .faq-rail-no {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--clay);
}

.page-faq .faq-rail-link:hover .faq-rail-no,
.page-faq .faq-rail-link:focus-visible .faq-rail-no {
  color: var(--neon);
}

.page-faq .faq-rail-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}

.page-faq .faq-rail-note a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 211, 247, .4);
}

.page-faq .faq-rail-note a:hover {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ===== 分组 ===== */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--bar) + 24px);
  margin-bottom: 52px;
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--line-strong);
}

.page-faq .faq-group-no {
  font-family: var(--f-display);
  font-size: var(--faq-num);
  line-height: .9;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--line-strong);
  transition: color .25s ease, -webkit-text-stroke-color .25s ease;
}

.page-faq .faq-group:target .faq-group-no {
  -webkit-text-stroke-color: var(--neon);
  color: rgba(182, 255, 60, .08);
}

.page-faq .faq-group-title {
  margin: 0 0 8px;
  font-size: clamp(21px, 4vw, 26px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-group-lede {
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ===== 问答条目 ===== */
.page-faq .faq-item {
  position: relative;
  border-bottom: 1px solid var(--line);
  transition: background .2s ease;
}

.page-faq .faq-item[open] {
  background: rgba(43, 49, 56, .42);
}

.page-faq .faq-item[open]::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--neon);
}

.page-faq .faq-q {
  display: flex;
  align-items: stretch;
  gap: 14px;
  padding: 16px 46px 16px 16px;
  list-style: none;
  cursor: pointer;
  position: relative;
}

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

.page-faq .faq-q:hover .faq-q-text {
  color: var(--neon);
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: -2px;
}

.page-faq .faq-q::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -6px;
  border-right: 2px solid var(--neon);
  border-bottom: 2px solid var(--neon);
  transform: rotate(45deg);
  transition: transform .2s ease, margin-top .2s ease;
}

.page-faq .faq-item[open] .faq-q::after {
  transform: rotate(-135deg);
  margin-top: -2px;
}

.page-faq .faq-q-no {
  flex: none;
  display: flex;
  align-items: center;
  padding-right: 12px;
  border-right: 1px solid var(--line-strong);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--ice);
}

.page-faq .faq-q-text {
  display: flex;
  align-items: center;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  transition: color .18s ease;
}

.page-faq .faq-a {
  padding: 0 28px 20px 28px;
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-faq .faq-a .mono,
.page-faq .faq-num {
  font-family: var(--f-mono);
  font-weight: 700;
  color: var(--neon);
}

/* ===== 图文并排 ===== */
.page-faq .faq-group-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
}

.page-faq .faq-group-list {
  min-width: 0;
}

.page-faq .faq-figure-tall {
  max-width: 340px;
}

.page-faq .faq-figure-wide {
  margin: 0 0 22px;
}

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

.page-faq .media-caption {
  font-size: 12px;
  line-height: 1.6;
}

/* ===== 联系卡 ===== */
.page-faq .faq-contact-card {
  margin-top: 26px;
  padding: 22px 20px;
  background: var(--ink-deep);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-faq .faq-contact-label {
  margin: 0 0 8px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-faq .faq-contact-card .contact-row {
  margin-bottom: 18px;
}

.page-faq .faq-contact-card .contact-value {
  font-family: var(--f-mono);
  font-size: 14px;
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-contact-value {
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .faq-contact-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-soft);
}

.page-faq .faq-contact-note a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 211, 247, .4);
}

/* ===== 后续入口 ===== */
.page-faq .faq-next {
  padding-top: 28px;
  border-top: 2px solid var(--line-strong);
}

.page-faq .faq-next-title {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

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

/* ===== 回到顶部 ===== */
.page-faq .faq-top {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 40;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  color: var(--neon);
  font-family: var(--f-mono);
  font-size: 16px;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: border-color .18s ease, color .18s ease;
}

.page-faq .faq-top:hover,
.page-faq .faq-top:focus-visible {
  border-color: var(--neon);
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-faq .faq-masthead {
    padding: 46px 40px 40px;
  }

  .page-faq .faq-group-split {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 30px;
  }

  .page-faq .faq-figure-tall {
    max-width: none;
  }

  .page-faq .faq-contact-card {
    padding: 26px 28px;
  }
}

@media (min-width: 1000px) {
  .page-faq {
    --faq-num: 58px;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-rail-gap);
    padding-top: 52px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--bar) + 28px);
    align-self: start;
    border-bottom: 0;
    border-right: 1px solid var(--line);
    padding: 0 20px 0 0;
  }

  .page-faq .faq-rail-list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-faq .faq-rail-link {
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border-color: transparent;
    border-left: 2px solid var(--line);
  }

  .page-faq .faq-rail-link:hover,
  .page-faq .faq-rail-link:focus-visible {
    border-left-color: var(--neon);
    background: rgba(43, 49, 56, .5);
  }

  .page-faq .faq-q {
    padding: 18px 50px 18px 20px;
  }

  .page-faq .faq-a {
    padding: 0 32px 22px 34px;
  }

  .page-faq .faq-top {
    right: 28px;
    bottom: 28px;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-group-split {
    grid-template-columns: minmax(0, 1fr) 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q::after,
  .page-faq .faq-q-text,
  .page-faq .faq-item,
  .page-faq .faq-rail-link,
  .page-faq .faq-top {
    transition: none;
  }
}