.page-faq {
  --faq-rail-w: 236px;
  --faq-panel: rgba(12, 42, 66, .55);
  --faq-panel-deep: rgba(5, 24, 42, .55);
  color: var(--white);
  overflow-x: hidden;
}

.page-faq .is-hidden {
  display: none !important;
}

/* ---------- 封面 ---------- */
.page-faq .faq-cover {
  position: relative;
  margin-top: calc(-1 * var(--header-h));
  padding: calc(var(--header-h) + 48px) 0 56px;
  overflow: hidden;
  background:
    radial-gradient(120% 92% at 12% 0%, rgba(20, 64, 95, .85) 0%, rgba(5, 24, 42, 0) 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-cover__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
  mix-blend-mode: luminosity;
  pointer-events: none;
}

.page-faq .faq-cover__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(155, 176, 194, .09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(155, 176, 194, .09) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 88%);
  pointer-events: none;
}

.page-faq .faq-cover__inner {
  position: relative;
  z-index: 2;
}

.page-faq .faq-eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-faq .faq-title {
  margin: 0 0 24px;
  max-width: 16em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.18;
  letter-spacing: .06em;
  color: var(--white);
}

.page-faq .faq-title::after {
  content: "";
  display: block;
  width: 88px;
  height: 2px;
  margin-top: 24px;
  background: linear-gradient(90deg, var(--gold), rgba(217, 166, 74, 0));
}

.page-faq .faq-lede {
  margin: 0 0 34px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-index {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-index .index-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-index .index-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-faq .faq-index .index-value {
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  padding: 22px 0 6px;
  font-size: 13px;
}

.page-faq .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-faq .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
}

.page-faq .breadcrumb-link:hover,
.page-faq .breadcrumb-link:focus-visible {
  color: var(--gold);
}

.page-faq .breadcrumb-current {
  color: var(--white);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  padding-top: 30px;
  padding-bottom: 84px;
}

.page-faq .faq-rail__head {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line-cool);
  color: var(--mist);
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--gold);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--jade-2024);
}

.page-faq .faq-rail__link:hover .faq-rail__num,
.page-faq .faq-rail__link:focus-visible .faq-rail__num {
  color: var(--gold);
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.page-faq .filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line-cool);
  border-radius: var(--radius);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-faq .filter-btn:hover {
  color: var(--white);
  border-color: var(--line-strong);
}

.page-faq .filter-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-faq .filter-btn.is-active {
  color: var(--ink-900);
  background: var(--gold);
  border-color: var(--gold);
}

.page-faq .faq-count {
  font-family: var(--font-mono);
  font-size: 12px;
  opacity: .72;
}

/* ---------- 分组与卡片 ---------- */
.page-faq .faq-group {
  margin-bottom: 54px;
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: .06em;
  color: var(--white);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-faq .faq-group__desc {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-figure {
  margin: 0 0 20px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-item {
  margin-bottom: 10px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--faq-panel) 0%, var(--faq-panel-deep) 100%);
  box-shadow: var(--shadow);
  transition: border-color .2s ease;
}

.page-faq .faq-item[open] {
  border-color: var(--line-strong);
}

.page-faq .faq-item.is-hidden {
  display: none;
}

.page-faq .faq-summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 56px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-marker {
  flex: none;
  width: 0;
  height: 0;
  margin-top: 7px;
  border-left: 7px solid var(--gold);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transition: transform .2s ease, border-left-color .2s ease;
}

.page-faq .faq-item[open] .faq-marker {
  transform: rotate(90deg);
}

.page-faq .faq-q {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--white);
}

.page-faq .faq-item[open] .faq-q {
  color: var(--gold-soft);
}

.page-faq .faq-a {
  padding: 14px 18px 20px 37px;
  border-top: 1px solid var(--line-cool);
}

.page-faq .faq-a p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-a a {
  color: var(--gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 空状态 ---------- */
.page-faq .filter-empty {
  padding: 26px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-cover {
    padding: calc(var(--header-h) + 74px) 0 76px;
  }

  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 44px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-right: 6px;
  }

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

  .page-faq .faq-a {
    padding-left: 43px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-group__desc {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-marker,
  .page-faq .filter-btn,
  .page-faq .faq-item,
  .page-faq .faq-rail__link {
    transition: none;
  }
}