.page-faq {
  --faq-index-w: 236px;
  --faq-rule: var(--line);
  color: var(--text);
}

/* ===== Hero ===== */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 34px 0 30px;
  border-bottom: 1px solid var(--faq-rule);
}

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

.page-faq .faq-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

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

.page-faq .faq-crumb__link {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}

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

.page-faq .faq-hero__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0 0 14px;
  max-width: 15ch;
  font-size: 30px;
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.012em;
  color: var(--text);
}

.page-faq .faq-hero__lead {
  margin: 0 0 26px;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.page-faq .faq-stat:nth-child(2) .faq-stat__num {
  color: var(--cyan);
}

.page-faq .faq-stat:nth-child(3) .faq-stat__num {
  color: var(--orange);
}

.page-faq .faq-stat__label {
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--muted);
}

/* ===== 主体骨架 ===== */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 32px;
  padding-bottom: 10px;
}

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

/* ===== 主题索引 ===== */
.page-faq .faq-index {
  min-width: 0;
}

.page-faq .kt-catalog__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .kt-catalog__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .kt-catalog__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--faq-rule);
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .kt-catalog__link:hover,
.page-faq .kt-catalog__link:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
}

.page-faq .kt-catalog__link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(43, 227, 210, .07);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
  color: var(--orange);
}

/* ===== 分组 ===== */
.page-faq .faq-group {
  padding-top: 22px;
  margin-bottom: 40px;
  border-top: 1px solid var(--faq-rule);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .faq-group:last-child {
  margin-bottom: 18px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 14px;
  margin-bottom: 14px;
}

.page-faq .faq-group__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-faq .faq-group:nth-of-type(even) .faq-group__num {
  color: var(--orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.008em;
  color: var(--text);
}

.page-faq .faq-group__note {
  margin: 0;
  font-size: 12.5px;
  font-style: italic;
  line-height: 1.5;
  color: var(--muted);
}

.page-faq .faq-group__lead {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ===== 问答条目 ===== */
.page-faq .faq-group__list {
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-item {
  border-top: 1px solid var(--faq-rule);
  transition: background-color .22s var(--ease);
}

.page-faq .faq-item[open] {
  background: rgba(18, 40, 61, .72);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 12px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text);
  transition: color .2s var(--ease);
}

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

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

.page-faq .faq-item__q:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 4px;
  margin-left: auto;
  border: 1px solid var(--faq-rule);
  border-radius: 2px;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .22s var(--ease), opacity .22s var(--ease), background-color .22s var(--ease);
}

.page-faq .faq-item__icon::before {
  left: 3px;
  right: 3px;
  top: 6.5px;
  height: 1.5px;
}

.page-faq .faq-item__icon::after {
  top: 3px;
  bottom: 3px;
  left: 6.5px;
  width: 1.5px;
}

.page-faq .faq-item[open] .faq-item__icon::before {
  background: var(--orange);
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 0 12px 18px;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

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

.page-faq .faq-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

/* ===== 配图 ===== */
.page-faq .faq-figure {
  margin: 0 0 18px;
  max-width: 100%;
}

.page-faq .faq-figure--square {
  max-width: 300px;
}

.page-faq .faq-figure--wide {
  margin-top: 4px;
  margin-bottom: 6px;
}

.page-faq .faq-figure .kt-media__img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 底部引导 ===== */
.page-faq .faq-cta {
  position: relative;
  overflow: hidden;
  margin-top: 20px;
  padding: 40px 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-cta__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 22px;
}

.page-faq .faq-cta__title {
  margin: 0 0 10px;
  font-size: 23px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.012em;
  color: var(--text);
}

.page-faq .faq-cta__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 640px 及以上 ===== */
@media (min-width: 640px) {
  .page-faq .faq-hero {
    padding: 46px 0 38px;
  }

  .page-faq .faq-hero__title {
    font-size: 40px;
  }

  .page-faq .faq-hero__lead {
    font-size: 15.5px;
  }

  .page-faq .faq-stat__num {
    font-size: 21px;
  }

  .page-faq .faq-group {
    padding-top: 26px;
    margin-bottom: 48px;
  }

  .page-faq .faq-group__num {
    font-size: 32px;
  }

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

  .page-faq .faq-item__q {
    padding: 17px 14px;
    font-size: 15.5px;
  }

  .page-faq .faq-item__a {
    padding: 0 14px 20px;
  }

  .page-faq .faq-cta {
    padding: 48px 0;
  }

  .page-faq .faq-cta__title {
    font-size: 26px;
  }
}

/* ===== 960px 及以上：左侧固定索引 + 右侧分组 ===== */
@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding: 58px 0 46px;
  }

  .page-faq .faq-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
      linear-gradient(101deg,
        transparent 0 53.4%,
        rgba(43, 227, 210, .45) 53.4% calc(53.4% + 2px),
        transparent calc(53.4% + 2px)),
      linear-gradient(101deg,
        transparent 0 55.6%,
        var(--ink-2) 55.6% 100%);
  }

  .page-faq .faq-hero__title {
    font-size: 48px;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 46px;
    padding-top: 46px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-faq .kt-catalog__list {
    display: block;
  }

  .page-faq .kt-catalog__list li + li {
    margin-top: 2px;
  }

  .page-faq .kt-catalog__link {
    padding: 9px 10px 9px 14px;
    border: 0;
    border-left: 2px solid var(--faq-rule);
    border-radius: 0;
    font-size: 14px;
  }

  .page-faq .faq-group {
    margin-bottom: 56px;
  }

  .page-faq .faq-group__head {
    margin-bottom: 18px;
  }

  .page-faq .faq-group__num {
    font-size: 36px;
  }

  .page-faq .faq-group__title {
    font-size: 25px;
  }

  .page-faq .faq-group__lead {
    font-size: 14.5px;
  }

  .page-faq .faq-figure--square {
    max-width: 340px;
  }

  .page-faq .faq-cta::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
    background: var(--ink-2);
    clip-path: polygon(46% 0, 100% 0, 100% 100%, 52% 100%);
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }
}

/* ===== 无障碍：减少动态 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after,
  .page-faq .faq-item,
  .page-faq .kt-catalog__link,
  .page-faq .faq-crumb__link {
    transition: none;
  }
}
</main>