.page-faq {
  --faq-line: rgba(44, 71, 64, .72);
  --faq-rail-w: 224px;
  --faq-gap-g: clamp(42px, 6vw, 74px);
  display: block;
  background: var(--ink);
  color: var(--warm);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 68px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(620px, 72vw);
  height: min(620px, 72vw);
  background: radial-gradient(circle at 50% 50%, rgba(124, 92, 255, .17), rgba(124, 92, 255, 0) 66%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
  }
}

.page-faq .faq-hero__tag {
  display: inline-block;
  margin: 0 0 14px;
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(28px, 5.4vw, 54px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.025em;
  color: var(--warm);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 34rem;
  font-size: 16px;
  line-height: 1.78;
  color: var(--soft);
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-faq .faq-hero__media {
  margin: 0;
}

.page-faq .faq-hero__media .media-frame {
  border: 1px solid var(--line);
}

.page-faq .faq-hero__media figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--mint);
}

/* ---------- 两栏主体 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  padding: clamp(34px, 6vw, 66px) 0 clamp(44px, 7vw, 92px);
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(44px, 6vw, 80px);
  }
}

/* ---------- 分组索引 ---------- */

.page-faq .faq-rail__label {
  display: block;
  margin: 0 0 14px;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-rail__link {
  display: grid;
  grid-template-columns: 2.1rem 8px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 9px 8px 9px 12px;
  border-left: 2px solid var(--line);
  color: var(--soft);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.4;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--warm);
  border-left-color: var(--lime);
  background: rgba(199, 255, 60, .05);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--purple);
}

.page-faq .faq-rail__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mint);
  transition: background-color .16s var(--ease), box-shadow .16s var(--ease);
}

.page-faq .faq-rail__link:hover .faq-rail__dot,
.page-faq .faq-rail__link:focus-visible .faq-rail__dot {
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(199, 255, 60, .16);
}

.page-faq .faq-rail__foot {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mint);
}

.page-faq .faq-rail__foot a {
  color: var(--soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

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

@media (min-width: 960px) {
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
    align-self: start;
  }
}

@media (max-width: 959px) {
  .page-faq .faq-rail__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    padding: 10px 0;
    gap: 6px;
  }

  .page-faq .faq-rail__link {
    grid-template-columns: auto 8px auto;
    border-left: 1px solid var(--line);
    padding: 7px 12px;
    white-space: nowrap;
  }
}

/* ---------- 分组 ---------- */

.page-faq .faq-groups {
  min-width: 0;
  max-width: 46rem;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--bar-h) + 28px);
}

.page-faq .faq-group + .faq-group {
  position: relative;
  margin-top: var(--faq-gap-g);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  position: absolute;
  top: calc(var(--faq-gap-g) * -.5);
  left: 0;
  right: 34%;
  height: 1px;
  background: linear-gradient(90deg, var(--line), rgba(44, 71, 64, 0));
  transform: skewY(-1.2deg);
  transform-origin: left center;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--purple);
}

.page-faq .faq-group__title {
  flex: 1 1 auto;
  margin: 0;
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 900;
  letter-spacing: -.015em;
  line-height: 1.2;
  color: var(--warm);
  transition: color .16s var(--ease);
}

.page-faq .faq-group__meta {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--mint);
  white-space: nowrap;
}

.page-faq .faq-group:target .faq-group__title {
  color: var(--lime);
}

/* ---------- 问法条目 ---------- */

.page-faq .faq-item {
  position: relative;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--lime);
  opacity: 0;
  transform: scaleY(.32);
  transform-origin: top center;
  transition: opacity .16s var(--ease), transform .22s var(--ease);
}

.page-faq .faq-item:has(.faq-trigger[aria-expanded="true"])::before {
  opacity: 1;
  transform: scaleY(1);
}

.page-faq .faq-item__head {
  margin: 0;
}

.page-faq .faq-trigger {
  appearance: none;
  width: 100%;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) 16px;
  align-items: center;
  gap: 14px;
  padding: 16px 6px 16px 16px;
  background: none;
  border: 0;
  font: inherit;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.55;
  text-align: left;
  color: var(--warm);
  cursor: pointer;
  transition: color .16s var(--ease);
}

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

.page-faq .faq-trigger:hover {
  color: var(--lime);
}

.page-faq .faq-trigger__mark {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mint);
  transition: border-color .16s var(--ease), color .16s var(--ease), background-color .16s var(--ease);
}

.page-faq .faq-trigger:hover .faq-trigger__mark {
  border-color: var(--mint);
  color: var(--soft);
}

.page-faq .faq-trigger[aria-expanded="true"] .faq-trigger__mark {
  border-color: var(--lime);
  background: var(--lime);
  color: var(--ink);
}

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

.page-faq .faq-trigger__chev {
  position: relative;
  justify-self: end;
  width: 14px;
  height: 14px;
}

.page-faq .faq-trigger__chev::before,
.page-faq .faq-trigger__chev::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--soft);
  transition: transform .18s var(--ease), background-color .16s var(--ease);
}

.page-faq .faq-trigger__chev::before {
  width: 12px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-trigger__chev::after {
  width: 1px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-trigger[aria-expanded="true"] .faq-trigger__chev::before {
  background: var(--lime);
}

.page-faq .faq-trigger[aria-expanded="true"] .faq-trigger__chev::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-panel {
  padding: 0 8px 20px 54px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--soft);
}

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

.page-faq .faq-panel a {
  color: var(--warm);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

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

.page-faq .faq-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--mint) !important;
  border-bottom: 1px solid transparent !important;
}

.page-faq .faq-back::before {
  content: "↑";
}

.page-faq .faq-back:hover {
  color: var(--lime) !important;
  border-bottom-color: var(--lime) !important;
}

/* ---------- 记录插图 ---------- */

.page-faq .faq-figure {
  margin: 24px 0 0;
}

.page-faq .faq-figure .media-frame {
  border: 1px solid var(--line);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--mint);
}

/* ---------- 窄屏微调 ---------- */

@media (max-width: 599px) {
  .page-faq .faq-trigger {
    grid-template-columns: 22px minmax(0, 1fr) 14px;
    gap: 10px;
    padding: 14px 4px 14px 12px;
  }

  .page-faq .faq-trigger__mark {
    width: 22px;
    height: 22px;
    font-size: 11px;
  }

  .page-faq .faq-panel {
    padding: 0 4px 18px 44px;
    font-size: 14.5px;
  }

  .page-faq .faq-hero__title {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-trigger__chev::before,
  .page-faq .faq-trigger__chev::after,
  .page-faq .faq-trigger__mark,
  .page-faq .faq-rail__link,
  .page-faq .faq-rail__dot {
    transition-duration: .01ms;
  }
}