.page-faq {
  --faq-rail-w: 236px;
  --faq-anchor-gap: 96px;
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--ms-line);
  background-image:
    linear-gradient(rgba(34, 50, 60, 0.28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 50, 60, 0.28) 1px, transparent 1px),
    linear-gradient(180deg, rgba(23, 53, 44, 0.9) 0%, rgba(6, 11, 18, 0) 76%);
  background-size: 96px 96px, 96px 96px, 100% 100%;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -42%;
  left: -22%;
  width: 72%;
  height: 184%;
  background: linear-gradient(150deg, rgba(23, 53, 44, 0.95), rgba(23, 53, 44, 0));
  transform: skewY(-6deg);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  padding-block: 40px 34px;
}

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

.page-faq .faq-hero__copy .ms-breadcrumb {
  margin-bottom: 18px;
}

.page-faq .faq-hero__copy .ms-h1 {
  margin: 10px 0 0;
  max-width: 18ch;
}

.page-faq .faq-hero__copy .ms-lede {
  margin-top: 16px;
  max-width: 56ch;
}

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

.page-faq .faq-hero__jump a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--ms-line);
  color: var(--ms-slate);
  font-size: var(--ms-t13);
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 160ms var(--ms-ease), border-color 160ms var(--ms-ease);
}

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

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--ms-line);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(52, 227, 194, 0.16), rgba(6, 11, 18, 0.72) 78%);
  pointer-events: none;
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  padding-block: 44px 60px;
}

.page-faq .faq-layout {
  display: grid;
  gap: 30px;
}

/* 分组轨道 */
.page-faq .faq-rail {
  border-top: 2px solid var(--ms-cyan);
  padding-top: 12px;
}

.page-faq .faq-rail__title {
  margin: 0;
  color: var(--ms-slate);
}

.page-faq .faq-rail__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__list li {
  border-bottom: 1px solid var(--ms-line);
  min-width: 0;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  padding: 12px 8px 12px 12px;
  border-left: 2px solid transparent;
  color: var(--ms-bone);
  font-size: var(--ms-t15);
  line-height: 1.5;
  text-decoration: none;
  transition: color 160ms var(--ms-ease), border-color 160ms var(--ms-ease), padding-left 160ms var(--ms-ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--ms-cyan);
  border-left-color: var(--ms-cyan);
  padding-left: 16px;
}

.page-faq .faq-rail__num {
  color: var(--ms-slate);
  font-size: var(--ms-t12);
  letter-spacing: 0.08em;
}

/* 问答堆栈 */
.page-faq .faq-stack {
  min-width: 0;
}

.page-faq .faq-group {
  margin-bottom: 52px;
  scroll-margin-top: var(--faq-anchor-gap);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ms-line);
}

.page-faq .faq-group__num {
  color: var(--ms-cyan);
  font-size: var(--ms-t13);
  letter-spacing: 0.12em;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  color: var(--ms-bone);
  font-family: var(--ms-display);
  font-size: clamp(1.32rem, 3.2vw, 1.9rem);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.25;
}

.page-faq .faq-group__head .ms-tag {
  margin-left: auto;
  white-space: nowrap;
}

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

.page-faq .faq-item > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 14px 0 14px 14px;
  border-left: 2px solid transparent;
  color: var(--ms-bone);
  font-size: var(--ms-t17);
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
  transition: color 160ms var(--ms-ease), border-color 160ms var(--ms-ease), padding-left 160ms var(--ms-ease);
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

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

.page-faq .faq-item > summary::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-right: 4px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg);
  transition: transform 180ms var(--ms-ease);
}

.page-faq .faq-item > summary:hover,
.page-faq .faq-item > summary:focus-visible {
  color: var(--ms-cyan);
  border-left-color: var(--ms-cyan);
  padding-left: 18px;
}

.page-faq .faq-item[open] > summary {
  color: var(--ms-cyan);
  border-left-color: var(--ms-cyan);
}

.page-faq .faq-item[open] > summary::after {
  transform: rotate(-135deg);
}

.page-faq .faq-item__a {
  display: grid;
  gap: 12px;
  padding: 0 0 22px 16px;
  margin-left: 0;
  border-left: 2px solid var(--ms-line);
  color: var(--ms-slate);
  font-size: var(--ms-t15);
  line-height: 1.75;
  max-width: 68ch;
}

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

.page-faq .faq-item__a a {
  color: var(--ms-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 227, 194, 0.4);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  border-bottom-color: var(--ms-cyan);
}

.page-faq .faq-note {
  justify-self: start;
  display: inline-block;
  padding: 4px 8px;
  border: 1px solid var(--ms-line);
  color: var(--ms-slate);
  font-family: var(--ms-mono);
  font-size: var(--ms-t12);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 组内配图 */
.page-faq .faq-figure {
  margin: 28px 0 0;
  max-width: 460px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--ms-line);
  filter: saturate(0.7);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  color: var(--ms-slate);
  font-size: var(--ms-t13);
  line-height: 1.7;
}

/* 联系块 */
.page-faq .faq-help {
  padding: 30px 22px;
  background: var(--ms-moss);
  border-left: 4px solid var(--ms-cyan);
  scroll-margin-top: var(--faq-anchor-gap);
}

.page-faq .faq-help .ms-eyebrow {
  margin: 0;
  color: var(--ms-cyan);
}

.page-faq .faq-help h2 {
  margin: 12px 0 0;
  color: var(--ms-bone);
  font-family: var(--ms-display);
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  font-weight: 400;
  line-height: 1.25;
}

.page-faq .faq-help > p {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--ms-bone);
  font-size: var(--ms-t15);
  line-height: 1.75;
}

.page-faq .faq-help__contact {
  display: grid;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-help__contact li {
  color: var(--ms-slate);
  font-size: var(--ms-t15);
}

.page-faq .faq-help__contact .ms-num {
  color: var(--ms-bone);
  font-size: var(--ms-t15);
  letter-spacing: 0.02em;
  word-break: break-all;
}

.page-faq .faq-help__note {
  margin-top: 16px;
  color: var(--ms-slate);
  font-size: var(--ms-t13);
  line-height: 1.7;
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero__inner {
    padding-block: 54px 44px;
  }

  .page-faq .faq-body {
    padding-block: 60px 84px;
  }

  .page-faq .faq-help {
    padding: 40px 36px;
  }

  .page-faq .faq-figure {
    margin-top: 32px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 48px;
    padding-block: 76px 52px;
  }

  .page-faq .faq-hero__media img {
    aspect-ratio: 4 / 3;
  }

  .page-faq .faq-body {
    padding-block: 76px 108px;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-rail__list {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-group {
    margin-bottom: 60px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item > summary,
  .page-faq .faq-item > summary::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-hero__jump a {
    transition: none;
  }
}