.page-faq {
  --faq-rail: 232px;
  --faq-gap: clamp(24px, 3.4vw, 52px);
  --accent: var(--cyan);
  background: var(--ink-0);
  color: var(--paper);
  padding-bottom: clamp(56px, 8vw, 110px);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(34px, 5vw, 62px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 14px);
  opacity: .9;
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-faq .faq-hero__copy .display {
  margin: 14px 0 0;
  font-size: clamp(38px, 7.4vw, 92px);
  line-height: .98;
  letter-spacing: -.03em;
  font-weight: 300;
  font-style: italic;
  color: var(--paper);
}

.page-faq .faq-hero__copy .display em {
  font-style: italic;
  color: var(--violet-soft);
  display: inline-block;
}

.page-faq .faq-hero__copy .lede {
  margin: 20px 0 0;
  max-width: 60ch;
  color: var(--muted);
}

/* 搜索框 */
.page-faq .faq-search {
  margin-top: clamp(22px, 3vw, 36px);
  max-width: 520px;
}

.page-faq .faq-search__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.page-faq .faq-search__box {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  background: var(--ink-1);
  border-radius: var(--radius);
  padding: 0 14px;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-faq .faq-search__box:focus-within {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(55, 245, 224, .12);
}

.page-faq .faq-search__icon {
  color: var(--cyan);
  font-size: 17px;
  line-height: 1;
  flex: none;
}

.page-faq .faq-search__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--paper);
  font: inherit;
  font-size: 15px;
  padding: 14px 0;
}

.page-faq .faq-search__input:focus { outline: none; }

.page-faq .faq-search__input::placeholder { color: #6c6488; }

.page-faq .faq-search__hint {
  margin: 10px 0 0;
  font-size: 12.5px;
  color: var(--muted);
}

/* 首屏图 */
.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  padding: 10px;
  background: linear-gradient(150deg, rgba(109, 61, 245, .24), rgba(7, 6, 11, 0) 64%);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), calc(100% - 44px) 100%, 0 100%);
  filter: saturate(.92) contrast(1.06);
}

.page-faq .faq-hero__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-hero__cap .mono { color: var(--cyan); }

/* ---------- 双栏主体 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  padding-top: clamp(30px, 4.6vw, 62px);
}

/* 索引 */
.page-faq .faq-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  min-width: 0;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  color: var(--muted);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .faq-index__list li { flex: none; }

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--paper);
  border-color: var(--violet-soft);
  background: rgba(109, 61, 245, .16);
}

.page-faq .faq-index__list .mono {
  color: var(--cyan);
  font-size: 10.5px;
  letter-spacing: .12em;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-sections { min-width: 0; }

.page-faq .faq-group {
  margin-bottom: clamp(38px, 5.4vw, 78px);
  scroll-margin-top: 104px;
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 4px;
}

.page-faq .faq-group__num {
  flex: none;
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 27px);
  font-weight: 600;
  letter-spacing: -.015em;
  line-height: 1.28;
  color: var(--paper);
}

.page-faq .faq-group__note {
  flex-basis: 100%;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 手风琴 */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
  transition: background .3s var(--ease);
}

.page-faq .faq-item[open] {
  background: linear-gradient(90deg, rgba(109, 61, 245, .12), rgba(7, 6, 11, 0) 76%);
}

.page-faq .faq-item__q {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 17px 44px 17px 6px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.55vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
  transition: color .25s var(--ease);
}

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

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

.page-faq .faq-item__mark {
  flex: none;
  padding-top: 4px;
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--violet-soft);
}

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.2;
  color: var(--cyan);
  transition: transform .3s var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "−";
  color: var(--orange);
}

.page-faq .faq-item__a {
  padding: 0 28px 20px 30px;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-faq .faq-item__a strong {
  color: var(--cyan);
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

.page-faq .faq-item__a a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 245, 224, .45);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-faq .faq-item__a .faq-small {
  font-size: 12.5px;
  color: #8f88a6;
}

.page-faq .faq-item__a .copy-btn { margin-top: 2px; }

/* 数据小标签 */
.page-faq .faq-figs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-figs li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-1);
  color: var(--paper);
}

/* 章节配图 */
.page-faq .faq-figure {
  margin: 20px 0 8px;
  border: 1px solid var(--line);
  padding: 10px;
  background: var(--ink-1);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(.9) contrast(1.05);
}

.page-faq .faq-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
  text-transform: uppercase;
}

/* 术语小抄 */
.page-faq .faq-terms {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 18px 0 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-faq .faq-term {
  background: var(--ink-1);
  padding: 18px 20px;
}

.page-faq .faq-term dt {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .faq-term dd {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* 回到顶部 */
.page-faq .faq-top {
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-top a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
  text-decoration: none;
  transition: color .25s var(--ease);
}

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

/* 滚动显现 */
.page-faq [data-reveal] {
  transform: translateY(14px);
  transition: transform .6s var(--ease);
}

.page-faq [data-reveal].is-visible {
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal] {
    transform: none;
    transition: none;
  }
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after {
    transition: none;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-item__a {
    padding-left: 34px;
    padding-right: 40px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(34px, 4vw, 68px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 92px;
    border-top: 0;
    padding-top: 0;
  }

  .page-faq .faq-index__title {
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding-bottom: 0;
  }

  .page-faq .faq-index__list a {
    white-space: normal;
    border-color: transparent;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 8px 12px;
  }

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