.page-faq {
  --faq-rail: 232px;
  display: block;
  background: var(--night);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 顶部 ---------- */
.page-faq .faq-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background: var(--night);
  overflow: hidden;
}

.page-faq .faq-hero__crumb {
  position: relative;
  z-index: 3;
  padding-top: clamp(14px, 2.4vw, 24px);
  padding-bottom: 6px;
}

.page-faq .faq-hero__media {
  position: relative;
  height: clamp(170px, 26vw, 300px);
  overflow: hidden;
  background: var(--grass);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
  filter: saturate(0.75);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(11, 18, 32, 0.15) 0%,
    rgba(11, 18, 32, 0.72) 48%,
    var(--night) 84%
  );
}

.page-faq .faq-hero__text {
  position: relative;
  z-index: 2;
  margin-top: -60px;
  padding-bottom: clamp(26px, 4vw, 48px);
}

.page-faq .faq-hero h1 {
  margin: 10px 0 0;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6vw, 62px);
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-faq .faq-hero .lead {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--text-dim);
}

/* ---------- 主栅格 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.4vw, 44px);
  padding-top: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(36px, 5vw, 72px);
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 左栏分组索引 ---------- */
.page-faq .faq-rail {
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-faq .faq-index {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-faq .faq-index::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-index-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: none;
  padding: 9px 13px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-faq .faq-index-link:hover {
  background: var(--grass);
  border-color: var(--line-strong);
  color: var(--cream);
}

.page-faq .faq-index-link:focus-visible {
  outline: 2px solid var(--live);
  outline-offset: 2px;
}

.page-faq .idx-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--live);
}

.page-faq .faq-rail__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-rail__note a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 227, 168, 0.42);
}

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

@media (min-width: 1000px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 84px;
    border-top: none;
    border-left: 1px solid var(--line-strong);
    padding-top: 0;
    padding-left: 18px;
  }

  .page-faq .faq-index {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index-link {
    width: 100%;
    justify-content: flex-start;
    padding: 10px 8px 10px 14px;
    border: none;
    border-left: 2px solid transparent;
    background: transparent;
    color: var(--text-dim);
    font-size: 14px;
    white-space: normal;
  }

  .page-faq .faq-index-link:hover {
    border-left-color: var(--moss);
    background: rgba(22, 32, 47, 0.55);
    color: var(--cream);
  }

  .page-faq .faq-index-link.is-current {
    border-left-color: var(--live);
    color: var(--cream);
  }
}

/* ---------- 分组 ---------- */
.page-faq .faq-body {
  min-width: 0;
}

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

.page-faq .faq-group + .faq-group {
  margin-top: clamp(32px, 4.2vw, 56px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .group-num {
  flex: none;
  padding-top: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--live);
}

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

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 33px);
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-faq .faq-group__note {
  margin: 9px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  position: relative;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--live);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform 220ms var(--ease);
}

.page-faq .faq-item[open]::before {
  transform: scaleY(1);
}

.page-faq .faq-item:target {
  background: rgba(200, 255, 61, 0.05);
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr) 18px;
  gap: 12px;
  align-items: start;
  padding: 16px 6px 16px 16px;
  list-style: none;
  cursor: pointer;
  transition: background 180ms var(--ease);
}

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

.page-faq .faq-q:hover {
  background: rgba(22, 32, 47, 0.62);
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--live);
  outline-offset: -2px;
}

.page-faq .q-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
  transition: color 180ms var(--ease);
}

.page-faq .faq-item[open] .q-num {
  color: var(--live);
}

.page-faq .q-text {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.7;
  color: var(--cream);
}

.page-faq .cross-mark {
  position: relative;
  display: block;
  justify-self: end;
  width: 18px;
  height: 18px;
  margin-top: 6px;
}

.page-faq .cross-mark::before,
.page-faq .cross-mark::after {
  content: "";
  position: absolute;
  background: var(--steel);
  transition: transform 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .cross-mark::before {
  left: 50%;
  top: 0;
  width: 1px;
  height: 100%;
  transform: translateX(-50%);
}

.page-faq .cross-mark::after {
  top: 50%;
  left: 0;
  height: 1px;
  width: 100%;
  transform: translateY(-50%);
}

.page-faq .faq-item[open] .cross-mark::before {
  transform: translateX(-50%) scaleY(0);
  background: var(--live);
}

.page-faq .faq-item[open] .cross-mark::after {
  background: var(--live);
}

/* ---------- 答案 ---------- */
.page-faq .faq-a {
  padding: 0 22px 22px 16px;
}

@media (min-width: 720px) {
  .page-faq .faq-a {
    padding-left: 56px;
    padding-right: 32px;
  }
}

.page-faq .faq-a p {
  margin: 0 0 10px;
  max-width: 70ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text-dim);
}

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

.page-faq .faq-a a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 227, 168, 0.42);
}

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

.page-faq .faq-points {
  display: grid;
  gap: 6px;
  margin: 12px 0 0;
  padding: 11px 0 0;
  list-style: none;
  border-top: 1px dashed var(--line-strong);
}

.page-faq .faq-points li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  font-size: 14px;
  line-height: 1.7;
}

@media (min-width: 560px) {
  .page-faq .faq-points li {
    grid-template-columns: 8.6em minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
}

.page-faq .pt-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mint);
}

.page-faq .pt-val {
  color: var(--text);
}

/* ---------- 示意图 ---------- */
.page-faq .faq-figure {
  margin: 18px 0 6px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-figure figcaption {
  padding: 11px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 底部快捷入口 ---------- */
.page-faq .faq-quick {
  padding-bottom: clamp(40px, 6vw, 78px);
}

.page-faq .faq-quick__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.2;
  color: var(--cream);
}

.page-faq .faq-quick__list {
  display: grid;
  gap: 1px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-faq .faq-quick__list li {
  background: var(--night);
}

.page-faq .faq-quick__list a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
  text-decoration: none;
  transition: background 180ms var(--ease), color 180ms var(--ease);
}

.page-faq .faq-quick__list a:hover {
  background: var(--grass);
  color: var(--cream);
}

.page-faq .faq-quick__list a:focus-visible {
  outline: 2px solid var(--live);
  outline-offset: -2px;
}

.page-faq .faq-quick__list .mono {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--live);
}

@media (min-width: 860px) {
  .page-faq .faq-quick__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 动效退化 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .cross-mark::before,
  .page-faq .cross-mark::after,
  .page-faq .faq-q,
  .page-faq .faq-index-link {
    transition: none;
  }
}