.page-faq {
  --faq-rail-w: minmax(200px, 268px);
  --faq-line: 1px solid var(--jiang-light);
}

/* ============ 页头 ============ */
.page-faq .faq-head {
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(1.25rem, 3vw, 2rem);
  max-width: 60ch;
}

.page-faq .faq-head__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--jiang);
  margin: 0 0 .9rem;
}

.page-faq .faq-head__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.05rem, 5.6vw, 3.65rem);
  line-height: 1.08;
  letter-spacing: -0.022em;
  color: var(--ink);
  margin: 0 0 1.1rem;
  text-wrap: balance;
}

.page-faq .faq-head__lede {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
  max-width: 56ch;
}

/* ============ 头部横幅图 ============ */
.page-faq .faq-banner {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
}

.page-faq .faq-banner .media {
  border: 2px solid var(--ink);
  box-shadow: var(--hard-shadow);
  background: var(--jiang-light);
  overflow: hidden;
}

.page-faq .faq-banner .media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 8;
  object-fit: cover;
}

.page-faq .faq-banner .media__caption {
  margin-top: .85rem;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ============ 顶部主题标签条 ============ */
.page-faq .topic-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: .8rem;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  margin-bottom: clamp(2rem, 4.5vw, 3.25rem);
}

.page-faq .topic-bar__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .topic-bar__chips {
  display: flex;
  gap: .45rem;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .topic-bar__chips::-webkit-scrollbar {
  display: none;
}

.page-faq .topic-bar__chip {
  flex: none;
  font-family: var(--font-body);
  font-size: 12.5px;
  line-height: 1;
  padding: .48rem .7rem;
  border: 1px solid var(--jiang-light);
  background: var(--paper);
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  border-radius: 0;
  transition: border-color .18s var(--ease), color .18s var(--ease), background-color .18s var(--ease);
}

.page-faq .topic-bar__chip:hover,
.page-faq .topic-bar__chip:focus-visible {
  border-color: var(--jiang);
  color: var(--jiang);
  background: var(--jiang-light);
}

/* ============ 主体两栏 ============ */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

/* ---- 左栏索引墙 ---- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__head {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 1rem;
  padding-bottom: .6rem;
  border-bottom: 2px solid var(--ink);
}

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

.page-faq .faq-rail__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .7rem;
  align-items: baseline;
  padding: .7rem 0 .7rem .85rem;
  border-left: 2px solid var(--jiang-light);
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .93rem;
  line-height: 1.5;
  transition: border-color .18s var(--ease), color .18s var(--ease), padding-left .18s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-left-color: var(--orange);
  color: var(--jiang);
  padding-left: 1.15rem;
}

.page-faq .faq-rail__idx {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--jiang);
}

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

.page-faq .faq-rail__figure {
  margin: 1.75rem 0 0;
}

.page-faq .faq-rail__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border: 2px solid var(--ink);
  background: var(--jiang-light);
}

/* ---- 右栏问答 ---- */
.page-faq .faq-body {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 96px;
  padding-block: clamp(1.5rem, 3.5vw, 2.5rem);
  border-top: var(--faq-line);
}

.page-faq .faq-group:first-child {
  border-top: none;
  padding-top: 0;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 .95rem;
  align-items: baseline;
  margin-bottom: 1.35rem;
}

.page-faq .faq-group__idx {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--jiang);
}

.page-faq .faq-group__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.3rem, 2.8vw, 1.78rem);
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 0;
}

.page-faq .faq-group__lede {
  grid-column: 2;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--slate);
  margin: .4rem 0 0;
  max-width: 54ch;
}

/* ---- 折叠条目 ---- */
.page-faq .faq {
  display: grid;
  gap: .7rem;
}

.page-faq .faq__item {
  border: 2px solid var(--ink);
  background: var(--paper);
  transition: box-shadow .18s var(--ease);
}

.page-faq .faq__item[data-open] {
  box-shadow: var(--hard-shadow-sm);
}

.page-faq .faq__item--lead {
  box-shadow: inset 4px 0 0 var(--orange);
}

.page-faq .faq__item--lead[data-open] {
  box-shadow: inset 4px 0 0 var(--orange), var(--hard-shadow-sm);
}

.page-faq .faq__q {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .92rem 1.05rem;
  background: transparent;
  border: 0;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: .98rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: background-color .18s var(--ease);
}

.page-faq .faq__q:hover {
  background: var(--jiang-light);
}

.page-faq .faq__item[data-open] .faq__q {
  background: var(--jiang-light);
}

.page-faq .faq__sign {
  position: relative;
  flex: none;
  align-self: center;
  width: 14px;
  height: 14px;
}

.page-faq .faq__sign::before,
.page-faq .faq__sign::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--jiang);
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq__sign::before {
  width: 14px;
  height: 2px;
}

.page-faq .faq__sign::after {
  width: 2px;
  height: 14px;
}

.page-faq .faq__item[data-open] .faq__sign::before {
  background: var(--orange);
}

.page-faq .faq__item[data-open] .faq__sign::after {
  transform: scaleY(0);
}

.page-faq .faq__a {
  display: block;
  padding: 0 1.05rem 1.15rem;
  border-top: var(--faq-line);
}

.has-js .page-faq .faq__item:not([data-open]) .faq__a {
  display: none;
}

.page-faq .faq__a p {
  margin: .95rem 0 0;
  font-size: .94rem;
  line-height: 1.88;
  color: var(--ink-soft);
  max-width: 62ch;
}

/* ---- 答案末尾的细线跳转 ---- */
.page-faq .faq-jump {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: 1rem;
  padding: .35rem 0;
  border-bottom: 1px solid var(--jiang);
  color: var(--jiang);
  text-decoration: none;
  font-size: .87rem;
  font-weight: 600;
  letter-spacing: .01em;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

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

.page-faq .faq-jump__arrow {
  transition: transform .18s var(--ease);
}

.page-faq .faq-jump:hover .faq-jump__arrow,
.page-faq .faq-jump:focus-visible .faq-jump__arrow {
  transform: translateX(3px);
}

/* ============ 响应式 ============ */
@media (min-width: 900px) {
  .page-faq .faq-head {
    padding-block: clamp(2.25rem, 4.5vw, 3.5rem) clamp(1.5rem, 3vw, 2.25rem);
    max-width: 64ch;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 84px;
  }

  .page-faq .topic-bar {
    gap: 1.5rem;
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-banner .media img {
    aspect-ratio: 24 / 8;
  }
}

@media (max-width: 899px) {
  .page-faq .faq-rail__figure {
    max-width: 420px;
  }
}

@media (max-width: 520px) {
  .page-faq .topic-bar {
    flex-wrap: wrap;
    gap: .65rem;
  }

  .page-faq .topic-bar__chips {
    width: 100%;
  }

  .page-faq .faq__q {
    padding: .82rem .85rem;
    font-size: .93rem;
  }

  .page-faq .faq__a {
    padding: 0 .85rem 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq__sign::before,
  .page-faq .faq__sign::after,
  .page-faq .faq__item,
  .page-faq .faq__q,
  .page-faq .faq-jump,
  .page-faq .faq-jump__arrow,
  .page-faq .faq-rail__link,
  .page-faq .topic-bar__chip {
    transition: none;
  }
}