.page-faq {
  --faq-rail-w: 236px;
  --faq-sticky: 104px;
}

/* ---------- 首屏：框景海报 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 130% at 92% 0%, rgba(53, 224, 208, .13), transparent 58%),
    radial-gradient(90% 120% at 2% 100%, rgba(142, 134, 201, .11), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--panel) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(to right, rgba(34, 48, 73, .6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 73, .6) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 80%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 80%);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 26px var(--gutter) 40px;
}

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

.page-faq .faq-hero__eyebrow {
  margin: 20px 0 0;
  color: var(--lilac);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(1.95rem, 6.2vw, 3.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.03em;
  color: var(--text);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 620px;
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__chips a {
  display: inline-block;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-2);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-hero__chips a:hover,
.page-faq .faq-hero__chips a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(53, 224, 208, .08);
}

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

.page-faq .faq-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  opacity: .88;
}

/* ---------- 主体：索引 + 问答流 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: 26px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 34px var(--gutter) 78px;
}

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

.page-faq .faq-rail__label {
  display: none;
  margin: 0 0 12px;
  color: var(--lilac);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-faq .faq-rail__nav::-webkit-scrollbar {
  height: 4px;
}

.page-faq .faq-rail__nav::-webkit-scrollbar-thumb {
  background: var(--line);
}

.page-faq .faq-rail__nav a {
  flex: 0 0 auto;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 13px;
  line-height: 1.4;
  color: var(--text-2);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-rail__nav a:hover,
.page-faq .faq-rail__nav a:focus-visible {
  color: var(--cyan);
  border-color: rgba(53, 224, 208, .6);
}

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

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 112px;
}

.page-faq .faq-group + .faq-group {
  margin-top: 48px;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--lilac);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--text);
}

/* ---------- 问答条目 ---------- */

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

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 0;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.65;
  color: var(--text);
  transition: color .2s var(--ease);
}

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

.page-faq .qa__q::marker {
  content: "";
}

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

.page-faq .qa__q::after {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 9px;
  border-right: 1.5px solid var(--lilac);
  border-bottom: 1.5px solid var(--lilac);
  transform: rotate(45deg);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

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

.page-faq .qa[open] .qa__q::after {
  border-color: var(--cyan);
  transform: rotate(-135deg);
}

.page-faq .qa__a {
  max-width: 70ch;
  padding: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-2);
}

.page-faq .qa__a p {
  margin: 0;
}

.page-faq .qa[open] .qa__a {
  animation: faq-open .2s var(--ease);
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 页内图 ---------- */

.page-faq .faq-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-2);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 5;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--lilac);
}

/* ---------- 收口分组 ---------- */

.page-faq .faq-group--close {
  padding: 22px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(155deg, var(--plum) 0%, var(--panel) 62%, var(--ink) 100%);
}

.page-faq .faq-group--close .faq-group__head {
  border-bottom-color: rgba(142, 134, 201, .35);
}

.page-faq .faq-group--close .qa:last-of-type {
  border-bottom: 0;
}

.page-faq .faq-close__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

/* ---------- 数字高亮 ---------- */

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .95em;
  padding: 1px 5px;
  color: var(--cyan);
  background: rgba(53, 224, 208, .1);
  border-radius: var(--radius);
}

/* ---------- 桌面栅格 ---------- */

@media (min-width: 1024px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 1fr);
    gap: 52px;
    align-items: end;
    padding: 52px 40px 58px;
  }

  .page-faq .faq-hero__visual {
    align-self: stretch;
    display: flex;
  }

  .page-faq .faq-hero__img {
    height: 100%;
    aspect-ratio: auto;
    min-height: 220px;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 0 60px;
    align-items: start;
    padding: 60px 40px 108px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky);
    align-self: start;
    max-height: calc(100vh - 132px);
    overflow-y: auto;
    scrollbar-width: thin;
  }

  .page-faq .faq-rail__label {
    display: block;
  }

  .page-faq .faq-rail__nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-rail__nav a {
    margin-left: -1px;
    padding: 9px 0 9px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 14px;
    white-space: normal;
  }

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

  .page-faq .faq-group--close {
    padding: 28px 30px 24px;
  }

  .page-faq .qa__q {
    font-size: 15.5px;
    padding: 16px 0;
  }

  .page-faq .qa__a {
    font-size: 15px;
    padding-bottom: 20px;
  }
}

@media (min-width: 1320px) {
  .page-faq .faq-body {
    gap: 0 84px;
  }
}

/* ---------- 动效克制 ---------- */

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

  .page-faq .qa__q,
  .page-faq .qa__q::after,
  .page-faq .faq-hero__chips a,
  .page-faq .faq-rail__nav a {
    transition: none;
  }
}