.page-faq {
  --faq-open-bg: #FCF8EF;
  --faq-indent: 1em;
  --faq-pad-l: 12px;
  --faq-idx-w: 24px;
  --faq-item-gap: 14px;
  --faq-answer-indent: calc(var(--faq-pad-l) + 3px + var(--faq-idx-w) + var(--faq-item-gap));
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  overflow: hidden;
}

.page-faq .faq-hero .crumbs__link,
.page-faq .faq-hero .crumbs__current {
  color: var(--mist-soft);
}

.page-faq .faq-hero .crumbs__link:hover {
  color: var(--mist);
}

.page-faq .faq-hero__head {
  max-width: 62ch;
  padding-bottom: clamp(28px, 4vw, 44px);
}

.page-faq .faq-hero__title {
  margin: 18px 0 20px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 6.4vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.7;
  color: var(--mist-soft);
}

.page-faq .faq-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
}

.page-faq .faq-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 12px;
  border-top: 2px solid rgba(207, 246, 234, 0.22);
}

.page-faq .faq-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  letter-spacing: 0;
  color: var(--amber);
}

.page-faq .faq-fact__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist-soft);
}

.page-faq .faq-hero__media {
  margin: clamp(30px, 5vw, 56px) 0 0;
  aspect-ratio: 5 / 3;
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding-block: clamp(40px, 6vw, 88px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 44px);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-rail {
  border-top: 2px solid var(--ink);
  padding-top: 16px;
}

.page-faq .rail__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-faq .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 8px 11px 11px;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--paper-line);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-faq .rail__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray);
}

.page-faq .rail__label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.35;
}

.page-faq .rail__link:hover {
  border-left-color: var(--gray);
  background: rgba(10, 15, 13, 0.04);
}

.page-faq .rail__link.is-active {
  border-left-color: var(--cyan);
  background: rgba(53, 240, 200, 0.16);
}

.page-faq .rail__meta {
  margin: 18px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--paper-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  margin: 0 0 clamp(44px, 6vw, 72px);
  scroll-margin-top: calc(var(--masthead-h) + 24px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gray);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 3vw, 27px);
  line-height: 1.2;
  letter-spacing: 0.005em;
  color: var(--ink);
}

.page-faq .faq-group__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray);
  white-space: nowrap;
}

.page-faq .faq-group__return {
  margin: 18px 0 0;
}

.page-faq .faq-return {
  display: inline-block;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--paper-line);
  transition: border-color 180ms var(--ease);
}

.page-faq .faq-return::before {
  content: "\2192";
  margin-right: 6px;
  color: var(--gray);
}

.page-faq .faq-return:hover {
  border-bottom-color: var(--ink);
}

/* ---------- 单条问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--paper-line);
  border-left: 3px solid transparent;
  transition: background-color 160ms var(--ease), border-left-color 160ms var(--ease);
}

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

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: var(--faq-item-gap);
  padding: 17px 16px 17px var(--faq-pad-l);
  list-style: none;
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink);
  transition: padding-left 160ms var(--ease);
}

.page-faq .faq-item__q:hover {
  background: rgba(10, 15, 13, 0.03);
}

.page-faq .faq-item__idx {
  flex: 0 0 var(--faq-idx-w);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--gray);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 400;
  line-height: 1;
  color: var(--gray);
  transition: color 160ms var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--faq-open-bg);
  border-left-color: var(--cyan);
}

.page-faq .faq-item[open] > .faq-item__q {
  padding-left: calc(var(--faq-pad-l) + var(--faq-indent));
  padding-bottom: 8px;
}

.page-faq .faq-item[open] > .faq-item__q::after {
  content: "\2013";
  color: var(--ink);
}

.page-faq .faq-item__a {
  padding: 0 20px 22px var(--faq-answer-indent);
  font-size: 16px;
  line-height: 1.72;
  color: rgba(10, 15, 13, 0.84);
}

.page-faq .faq-item[open] > .faq-item__a {
  padding-left: calc(var(--faq-answer-indent) + var(--faq-indent));
}

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

.page-faq .faq-item__a p + p {
  margin-top: 0.7em;
}

.page-faq .faq-mark {
  border-bottom: 1px dashed var(--amber);
}

.page-faq .faq-mono {
  font-family: var(--font-mono);
  font-size: 0.94em;
  letter-spacing: 0;
}

/* ---------- 中部图形 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(44px, 6vw, 72px);
}

.page-faq .faq-figure__frame {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.page-faq .faq-figure__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-faq .faq-figure__caption {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--paper-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--gap);
  }
}

@media (min-width: 768px) {
  .page-faq .faq-hero__media {
    aspect-ratio: 3 / 1;
  }

  .page-faq .faq-figure__frame {
    aspect-ratio: 2 / 1;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(200px, 3fr) minmax(0, 9fr);
    gap: var(--gap);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--masthead-h) + 28px);
    align-self: start;
  }
}

@media (max-width: 480px) {
  .page-faq {
    --faq-pad-l: 10px;
    --faq-idx-w: 20px;
    --faq-item-gap: 10px;
  }

  .page-faq .faq-item__q {
    font-size: 16px;
    padding-top: 15px;
    padding-bottom: 15px;
  }

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

  .page-faq .faq-group__count {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after,
  .page-faq .rail__link,
  .page-faq .faq-return {
    transition: none;
  }
}