.page-faq {
  --faq-index-w: 272px;
  --faq-gap: 20px;
  background: var(--c-indigo);
  color: var(--c-lamp);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-masthead {
  padding-top: 28px;
  padding-bottom: 20px;
}

.page-faq .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  font-size: 13px;
}

.page-faq .crumbs__sep {
  color: var(--c-haze);
}

.page-faq .faq-title {
  margin: 12px 0 14px;
  max-width: 18em;
  font-family: var(--font-display);
  font-size: clamp(27px, 5.4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0.07em;
  color: var(--c-lamp);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 46em;
  font-family: var(--font-serif);
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--c-haze);
}

.page-faq .faq-hero {
  margin: 26px 0 0;
}

.page-faq .faq-hero .figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--c-night);
}

.page-faq .faq-hero .figure__media--wide {
  aspect-ratio: 21 / 9;
}

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

.page-faq .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-haze);
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 10px;
  padding-bottom: 64px;
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index {
  border-top: 1px solid var(--line-strong);
  padding-top: 16px;
}

.page-faq .faq-index__label {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-haze);
}

.page-faq .faq-index__toc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-faq .faq-index__group {
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

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

.page-faq .faq-index__group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--c-lamp);
}

.page-faq .faq-index__count {
  font-size: 12px;
  color: var(--c-amber);
}

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

.page-faq .faq-index .toc__item {
  margin: 0;
}

.page-faq .faq-index .toc__link {
  display: block;
  margin-left: -13px;
  padding: 5px 6px 5px 11px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--c-haze);
  text-decoration: none;
  transition: color 160ms var(--ease), background-color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-index .toc__link:hover {
  color: var(--c-lamp);
  background: var(--tint-cyan);
}

.page-faq .faq-index .toc__link[aria-current="true"] {
  color: var(--c-lamp);
  border-left-color: var(--c-amber);
  background: var(--tint-amber);
}

.page-faq .faq-index .toc__link:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

/* ---------- 答案区 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 38px;
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.09em;
  color: var(--c-lamp);
}

.page-faq .faq-group__title::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 10px;
  vertical-align: 5px;
  background: var(--c-cyan);
}

.page-faq .faq-group__count {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

.page-faq .faq-group__note {
  margin: 0 0 16px;
  padding: 12px 0 12px 12px;
  border-left: 1px solid var(--line-strong);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-haze);
}

.page-faq .faq-figure {
  margin: 0 0 18px;
}

.page-faq .faq-figure .figure__media {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--c-night);
}

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

/* 折叠条目 */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 2px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-lamp);
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-item__q::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-right: 1.5px solid var(--c-haze);
  border-bottom: 1.5px solid var(--c-haze);
  transform: rotate(45deg);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-item__q:hover {
  color: var(--c-cyan);
}

.page-faq .faq-item__q:hover::before {
  border-color: var(--c-cyan);
}

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

.page-faq .faq-item[open] .faq-item__q {
  color: var(--c-cyan);
}

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

.page-faq .faq-item__a {
  padding: 0 2px 20px 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-haze);
  animation: faq-open 180ms var(--ease) both;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-steps {
  counter-reset: faqstep;
  display: grid;
  gap: 8px;
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps > li {
  position: relative;
  padding-left: 34px;
  counter-increment: faqstep;
}

.page-faq .faq-steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  border-bottom: 1px solid var(--tint-cyan);
}

.page-faq .faq-item__more {
  display: inline-block;
  margin-top: 12px;
  padding-bottom: 1px;
  border-bottom: 1px solid var(--tint-cyan);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-cyan);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-item__more:hover {
  color: var(--c-lamp);
  border-bottom-color: var(--c-lamp);
}

.page-faq .faq-item__more:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-faq .faq-index__toc {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 22px;
  }

  .page-faq .faq-figure {
    max-width: 460px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-masthead {
    padding-top: 44px;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 16px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 32px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    padding-right: 6px;
  }

  .page-faq .faq-index__toc {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-body {
    gap: 46px;
  }

  .page-faq .faq-group__title {
    font-size: 22px;
  }

  .page-faq .faq-item__q {
    font-size: 17px;
    padding: 18px 2px;
  }

  .page-faq .faq-item__a {
    font-size: 15.5px;
    padding-left: 22px;
    max-width: 62ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item__q::before,
  .page-faq .faq-index .toc__link,
  .page-faq .faq-item__more {
    transition: none;
  }
}