.page-faq {
  --faq-rule: rgba(90, 101, 112, 0.44);
  --faq-rule-soft: rgba(90, 101, 112, 0.2);
  --faq-fg: rgba(242, 246, 248, 0.78);
  --faq-fg-dim: rgba(242, 246, 248, 0.5);
  --faq-panel: rgba(18, 58, 92, 0.52);
  display: block;
  background: var(--c-deep);
  color: var(--c-spray);
}

/* ---------- 页首 ---------- */

.page-faq .faq-masthead {
  position: relative;
  overflow: clip;
  padding: clamp(2.25rem, 6vw, 4.5rem) 0 clamp(1.75rem, 4vw, 3rem);
  background:
    linear-gradient(107deg, rgba(30, 111, 168, 0.42) 0%, rgba(30, 111, 168, 0) 52%),
    linear-gradient(180deg, var(--c-deep) 0%, #0d2a45 100%);
}

.page-faq .faq-masthead::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    107deg,
    rgba(242, 246, 248, 0.055) 0px,
    rgba(242, 246, 248, 0.055) 1px,
    transparent 1px,
    transparent 46px
  );
}

.page-faq .faq-masthead .wrap {
  position: relative;
  z-index: 1;
}

.page-faq .faq-masthead__crumbs {
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-faq .faq-masthead__annot {
  display: none;
  position: absolute;
  top: 0;
  right: var(--gutter);
  letter-spacing: 0.32em;
  color: var(--c-rock);
  font-size: var(--fs-xs);
}

.page-faq .faq-masthead__title {
  display: block;
  margin: 0;
  max-width: 15ch;
  font-size: var(--fs-display);
  font-weight: 900;
  font-style: italic;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  color: var(--c-spray);
  transform: skewX(-9deg);
  transform-origin: left bottom;
  text-wrap: balance;
}

.page-faq .faq-masthead__lede {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 36rem;
  font-size: var(--fs-md);
  line-height: var(--lh-body);
  color: var(--faq-fg);
}

.page-faq .faq-masthead__media {
  margin: clamp(1.75rem, 3.5vw, 2.75rem) 0 0;
  border-radius: var(--cut);
  overflow: hidden;
  position: relative;
}

.page-faq .faq-masthead__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(196deg, rgba(11, 34, 57, 0.7) 0%, rgba(11, 34, 57, 0) 58%);
  pointer-events: none;
}

.page-faq .faq-masthead__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: var(--band);
}

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

/* ---------- 分类索引 ---------- */

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

.page-faq .faq-index__label {
  display: block;
  margin: 0 0 0.6rem;
  letter-spacing: 0.28em;
  color: var(--c-rock);
  font-size: var(--fs-xs);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--faq-rule-soft);
  border-radius: 999px;
  color: var(--faq-fg);
  font-size: var(--fs-sm);
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 0.22s var(--ease),
    border-color 0.22s var(--ease),
    background-color 0.22s var(--ease);
}

.page-faq .faq-index__num {
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--c-tide);
}

.page-faq .faq-index__count {
  font-size: var(--fs-xs);
  color: var(--c-rock);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--c-signal);
  color: var(--c-spray);
  background-color: rgba(255, 107, 44, 0.08);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--c-tide);
  outline-offset: 2px;
}

/* ---------- 搜索 ---------- */

.page-faq .faq-search {
  position: relative;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-faq .faq-search__icon {
  position: absolute;
  left: 1.05rem;
  top: 50%;
  width: 13px;
  height: 13px;
  margin-top: -9px;
  border: 2px solid var(--c-rock);
  border-radius: 50%;
  pointer-events: none;
  transition: border-color 0.22s var(--ease);
}

.page-faq .faq-search__icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -5px;
  width: 7px;
  height: 2px;
  background: var(--c-rock);
  transform: rotate(45deg);
  transition: background-color 0.22s var(--ease);
}

.page-faq .faq-search__field {
  width: 100%;
  box-sizing: border-box;
  padding: 0.85rem 1rem 0.85rem 2.75rem;
  background: var(--faq-panel);
  border: 1px solid var(--faq-rule);
  border-radius: var(--cut);
  color: var(--c-spray);
  font-family: var(--f-sans);
  font-size: var(--fs-base);
  line-height: 1.4;
  appearance: none;
  transition:
    border-color 0.22s var(--ease),
    background-color 0.22s var(--ease);
}

.page-faq .faq-search__field::placeholder {
  color: var(--faq-fg-dim);
}

.page-faq .faq-search__field:focus {
  outline: none;
  border-color: var(--c-tide);
  background-color: rgba(18, 58, 92, 0.82);
}

.page-faq .faq-search__field:focus ~ .faq-search__icon,
.page-faq .faq-search:focus-within .faq-search__icon {
  border-color: var(--c-tide);
}

.page-faq .faq-search:focus-within .faq-search__icon::after {
  background: var(--c-tide);
}

/* ---------- 章节 ---------- */

.page-faq .faq-section + .faq-section {
  margin-top: clamp(2.5rem, 5.5vw, 4rem);
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--faq-rule);
  overflow: clip;
}

.page-faq .faq-section__num {
  flex: 0 0 auto;
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
  color: var(--c-signal);
}

.page-faq .faq-section__title {
  margin: 0;
  font-size: var(--fs-lg);
  font-weight: 800;
  font-style: italic;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-spray);
}

.page-faq .faq-section__title > span {
  display: inline-block;
  transform: skewX(-9deg);
  transform-origin: left bottom;
}

.page-faq .faq-section__count {
  margin-left: auto;
  flex: 0 0 auto;
  font-size: var(--fs-xs);
  color: var(--c-rock);
  letter-spacing: 0.06em;
}

/* ---------- 数据章节配图 ---------- */

.page-faq .faq-figure {
  margin: clamp(1.25rem, 3vw, 1.85rem) 0 0;
  border-radius: var(--cut);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--faq-rule-soft);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-faq .faq-figure .media__caption {
  display: block;
  padding: 0.7rem 1rem 0.8rem;
  background: rgba(11, 34, 57, 0.85);
  color: var(--faq-fg-dim);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  margin-top: 0.35rem;
}

.page-faq .faq-item {
  position: relative;
  border-bottom: 1px solid var(--faq-rule-soft);
  background: transparent;
  transition: background-color 0.24s var(--ease);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--c-signal);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.28s var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.075) 0%, rgba(255, 107, 44, 0) 62%);
}

.page-faq .faq-item[open]::before {
  transform: scaleY(1);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1.05rem 0.75rem 1.05rem 1.1rem;
  cursor: pointer;
  list-style: none;
  color: var(--c-spray);
  font-size: var(--fs-md);
  font-weight: 700;
  font-style: italic;
  line-height: 1.5;
  transition: color 0.22s var(--ease);
}

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

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--c-signal);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--c-tide);
  outline-offset: -2px;
}

.page-faq .faq-item__idx {
  flex: 0 0 auto;
  padding-top: 0.3em;
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--c-rock);
  transition: color 0.22s var(--ease);
}

.page-faq .faq-item[open] .faq-item__idx,
.page-faq .faq-item__q:hover .faq-item__idx {
  color: var(--c-signal);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__q::after {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-left: auto;
  margin-top: 0.55em;
  border-right: 2px solid var(--c-rock);
  border-bottom: 2px solid var(--c-rock);
  transform: rotate(45deg);
  transition:
    transform 0.26s var(--ease),
    border-color 0.26s var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  transform: rotate(-135deg);
  border-color: var(--c-signal);
}

.page-faq .faq-item__a {
  padding: 0 1.25rem 1.4rem 3.15rem;
  max-width: 44rem;
  color: var(--faq-fg);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
}

.page-faq .faq-item__a p {
  margin: 0 0 0.65rem;
}

.page-faq .faq-item__a p:last-child {
  margin-bottom: 0;
}

/* ---------- 页尾提示 ---------- */

.page-faq .faq-tailnote {
  margin: clamp(2.25rem, 5vw, 3.25rem) 0 0;
  padding: 1.1rem 1.25rem 1.2rem;
  border-left: 3px solid var(--c-clay);
  background: rgba(18, 58, 92, 0.42);
  border-radius: 0 var(--cut) var(--cut) 0;
  color: var(--faq-fg);
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  max-width: 46rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-masthead__media img,
  .page-faq .faq-figure img {
    aspect-ratio: 16 / 6;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--top-h) + 1.5rem);
    padding-right: 1.25rem;
    border-right: 1px solid var(--faq-rule-soft);
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__link {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    padding: 0.55rem 0.5rem 0.55rem 0.85rem;
    border: none;
    border-left: 3px solid transparent;
    border-radius: 0;
    white-space: normal;
    font-size: var(--fs-base);
    font-weight: 600;
    color: var(--faq-fg);
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background-color: rgba(255, 107, 44, 0.07);
    border-left-color: var(--c-signal);
  }

  .page-faq .faq-index__count {
    margin-left: auto;
  }

  .page-faq .faq-masthead__title {
    font-size: var(--fs-display);
  }

  .page-faq .faq-item__q {
    padding-left: 1.35rem;
    padding-right: 1rem;
  }

  .page-faq .faq-item__a {
    padding-left: 3.6rem;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-masthead__annot {
    display: block;
  }

  .page-faq .faq-layout {
    grid-template-columns: 252px minmax(0, 1fr);
    gap: clamp(2.5rem, 4.5vw, 4.5rem);
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-layout {
    grid-template-columns: 268px minmax(0, 1fr) 148px;
  }

  .page-faq .faq-index {
    grid-column: 1;
  }

  .page-faq .faq-main {
    grid-column: 2;
  }

  .page-faq .faq-tailnote {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-search__field,
  .page-faq .faq-item,
  .page-faq .faq-item::before,
  .page-faq .faq-item__q,
  .page-faq .faq-item__idx,
  .page-faq .faq-item__q::after,
  .page-faq .faq-search__icon,
  .page-faq .faq-search__icon::after {
    transition: none;
  }
}