.page-faq {
  --faq-hot: rgba(53, 240, 224, 0.45);
  --faq-line: rgba(147, 164, 200, 0.18);
  --faq-line-soft: rgba(147, 164, 200, 0.10);
  --faq-rail-top: 108px;
  display: block;
  background-image:
    radial-gradient(1100px 520px at 86% -6%, rgba(140, 91, 255, 0.15), transparent 68%),
    radial-gradient(880px 460px at 4% 2%, rgba(53, 240, 224, 0.09), transparent 70%);
  background-repeat: no-repeat;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(30px, 4.5vw, 52px);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
  margin-top: clamp(18px, 3vw, 32px);
}

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  font-weight: 300;
}

.page-faq .faq-hero__aside {
  border-left: 1px solid var(--faq-hot);
  padding-left: clamp(14px, 2vw, 22px);
}

.page-faq .faq-hero__text {
  margin: 0;
  max-width: 60ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-hero__figure {
  margin-top: clamp(24px, 4vw, 46px);
}

.page-faq .faq-hero__figure .media-frame__caption {
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-main {
  position: relative;
}

.page-faq .faq-layout {
  align-items: start;
  row-gap: clamp(26px, 4vw, 40px);
}

/* ---------- 左侧坐标栏 ---------- */
.page-faq .faq-rail {
  border-left: 2px solid rgba(53, 240, 224, 0.34);
  padding-left: 16px;
}

.page-faq .faq-rail__label {
  margin: 0 0 14px;
  color: var(--mist);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 14px;
}

.page-faq .faq-rail__link {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  padding: 8px 0;
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.9375rem;
  line-height: 1.5;
  border-bottom: 1px solid var(--faq-line-soft);
  transition: color 0.24s var(--ease), padding-left 0.24s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--frost);
  padding-left: 6px;
}

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

.page-faq .faq-rail__code {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

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

.page-faq .faq-rail__top {
  display: inline-block;
  margin-top: 18px;
  padding-bottom: 3px;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 224, 0.32);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--faq-rail-top) + 14px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(40px, 5.5vw, 76px);
}

.page-faq .faq-group__head {
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 3px solid rgba(140, 91, 255, 0.55);
  margin-bottom: clamp(14px, 2.2vw, 22px);
  transition: border-color 0.3s var(--ease);
}

.page-faq .faq-group__code {
  margin: 0 0 6px;
  color: var(--violet);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-faq .faq-group__note {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-group:target .faq-group__head {
  border-left-color: var(--cyan);
}

.page-faq .faq-group:target .faq-group__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin-top: 12px;
  background: var(--cyan);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  border-top: var(--edge);
}

.page-faq .faq-item {
  border-bottom: var(--edge);
  transition: background 0.26s var(--ease);
}

.page-faq .faq-item[open] {
  background-image: linear-gradient(90deg, rgba(53, 240, 224, 0.07), rgba(14, 22, 51, 0) 64%);
}

.page-faq .faq-item__q {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: clamp(15px, 2.1vw, 21px) 2px;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  font-weight: 500;
  line-height: 1.55;
  color: var(--frost);
  transition: color 0.22s var(--ease);
}

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

.page-faq .faq-item__q::marker,
.page-faq .faq-item__q::before {
  content: none;
}

.page-faq .faq-item__q::after {
  content: "";
  width: 9px;
  height: 9px;
  margin-top: -4px;
  border-right: 1.6px solid var(--mist);
  border-bottom: 1.6px solid var(--mist);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease), border-color 0.24s var(--ease), margin-top 0.3s var(--ease);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}

.page-faq .faq-item[open] > .faq-item__q::after {
  transform: rotate(-135deg);
  border-color: var(--cyan);
  margin-top: 4px;
}

.page-faq .faq-item__a {
  border-top: 1px dashed rgba(53, 240, 224, 0.18);
  padding-top: 14px;
  padding-right: clamp(18px, 4vw, 56px);
  padding-bottom: clamp(18px, 2.4vw, 26px);
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--text-dim);
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
}

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

.page-faq .faq-item__a strong {
  color: var(--frost);
  font-weight: 600;
}

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 224, 0.38);
}

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

/* ---------- 步骤条 ---------- */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-steps__item {
  position: relative;
  counter-increment: faqstep;
  padding-left: 34px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-steps__item::before {
  content: counter(faqstep);
  position: absolute;
  left: 0;
  top: 3px;
  width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  line-height: 1;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 50%;
}

.page-faq .faq-steps__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 28px;
  bottom: -10px;
  width: 1px;
  background: rgba(53, 240, 224, 0.26);
}

/* ---------- 分组配图 ---------- */
.page-faq .faq-group__figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-faq .faq-group__figure .media-frame__caption {
  font-size: 0.8125rem;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-outro {
  padding-top: 0;
}

.page-faq .faq-outro__card {
  padding: clamp(24px, 4vw, 44px);
  border-left: 3px solid rgba(140, 91, 255, 0.6);
}

.page-faq .faq-outro__title {
  margin: 10px 0 12px;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 400;
  line-height: 1.2;
  color: var(--frost);
}

.page-faq .faq-outro__text {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-outro__mail {
  margin: 18px 0 0;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-rail-top);
    align-self: start;
  }

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

  .page-faq .faq-rail__link {
    padding: 9px 0 9px 0;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 899px) {
  .page-faq .faq-rail {
    border-left: 0;
    border-top: var(--edge);
    padding: 16px 0 0;
  }

  .page-faq .faq-item__a {
    padding-right: 4px;
  }
}

@media (max-width: 640px) {
  .page-faq .faq-rail__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .faq-hero__aside {
    border-left-width: 1px;
    padding-left: 12px;
  }

  .page-faq .faq-group__head {
    padding-left: 12px;
  }

  .page-faq .faq-outro__actions .btn {
    width: 100%;
    text-align: center;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after,
  .page-faq .faq-group__head,
  .page-faq .faq-rail__top {
    transition: none;
  }
}
</>