.page-faq {
  --faq-accent: var(--cyan);
  display: block;
  padding-bottom: 0;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--paper-52);
}
.page-faq .faq-crumbs a {
  color: var(--cyan);
  text-decoration: none;
}
.page-faq .faq-crumbs a:hover {
  color: var(--gold);
}
.page-faq .faq-crumbs__sep {
  color: var(--line-soft);
}
.page-faq .faq-crumbs__now {
  color: var(--paper-70);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: 26px 0 0;
}
.page-faq .faq-hero__top {
  display: grid;
  gap: 28px;
}
.page-faq .faq-hero__title {
  margin: 12px 0 16px;
  font-size: var(--step-5);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--paper);
}
.page-faq .faq-hero__title em {
  font-style: normal;
  color: var(--cyan);
  position: relative;
}
.page-faq .faq-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.page-faq .faq-hero__lede {
  max-width: 44ch;
  color: var(--paper-86);
}

.page-faq .faq-hero__stats {
  margin: 0;
  border-top: 1px solid var(--line-soft);
}
.page-faq .faq-hero__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-faint);
}
.page-faq .faq-hero__stat dt {
  font-size: 13px;
  color: var(--paper-70);
  letter-spacing: .02em;
}
.page-faq .faq-hero__stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-size: 13px;
  color: var(--paper-70);
}
.page-faq .faq-hero__stat dd .mono {
  font-size: 22px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-faq .faq-banner {
  margin: 34px 0 0;
  position: relative;
  border: 1px solid var(--line-soft);
  background: var(--deep);
  overflow: hidden;
}
.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 600;
  object-fit: cover;
  filter: saturate(.8) contrast(1.06);
}
.page-faq .faq-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 20, 40, .05) 0%, rgba(10, 20, 40, .68) 100%),
    linear-gradient(90deg, rgba(34, 224, 214, .16), transparent 46%);
  pointer-events: none;
}

/* ---------- 分组索引条 ---------- */
.page-faq .faq-index {
  padding: 22px 0 0;
}
.page-faq .faq-index__bar {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-faint);
  padding: 14px 0;
  display: grid;
  gap: 12px;
}
.page-faq .faq-index__count {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--paper-52);
}
.page-faq .faq-index__count .mono {
  color: var(--gold);
  font-size: 14px;
  font-weight: 700;
}
.page-faq .faq-index__row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-faq .faq-index__row::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-chip {
  --chip-accent: var(--cyan);
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  border-color: var(--line-soft);
  color: var(--paper-70);
  transition: color .24s var(--ease), border-color .24s var(--ease), background-color .24s var(--ease);
}
.page-faq .faq-chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--chip-accent);
  margin-right: 7px;
  flex: 0 0 auto;
}
.page-faq .faq-chip:hover,
.page-faq .faq-chip:focus-visible {
  border-color: var(--chip-accent);
  color: var(--chip-accent);
  background: rgba(16, 31, 58, .8);
}
.page-faq .faq-chip--start { --chip-accent: var(--cyan); }
.page-faq .faq-chip--preview { --chip-accent: var(--gold); }
.page-faq .faq-chip--replay { --chip-accent: var(--rose); }
.page-faq .faq-chip--data { --chip-accent: var(--moss); }
.page-faq .faq-chip--help { --chip-accent: var(--clay); }

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding: 52px 0 44px;
  scroll-margin-top: 96px;
}
.page-faq .faq-group + .faq-group {
  border-top: 1px solid var(--line-faint);
}
.page-faq .faq-group__head {
  margin-bottom: 22px;
  max-width: 62ch;
}
.page-faq .faq-group__bar {
  display: block;
  width: 48px;
  height: 3px;
  margin-bottom: 16px;
  background: var(--faq-accent);
}
.page-faq .faq-group__title {
  margin: 8px 0 10px;
  font-size: var(--step-3);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}
.page-faq .faq-group__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-70);
  max-width: 40ch;
}
.page-faq .faq-group--start  { --faq-accent: var(--cyan); }
.page-faq .faq-group--preview { --faq-accent: var(--gold); }
.page-faq .faq-group--replay { --faq-accent: var(--rose); }
.page-faq .faq-group--data   { --faq-accent: var(--moss); }
.page-faq .faq-group--help   { --faq-accent: var(--clay); }

/* ---------- 折叠问答 ---------- */
.page-faq .acc {
  border-top: 1px solid var(--line-soft);
}
.page-faq .acc__item {
  position: relative;
  border-bottom: 1px solid var(--line-faint);
}
.page-faq .acc__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--faq-accent);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .3s var(--ease);
}
.page-faq .acc__item[data-open]::before,
.page-faq .acc__item.is-open::before {
  transform: scaleY(1);
}

.page-faq .acc__head {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
}
.page-faq .acc__trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 18px 4px 18px 14px;
  background: none;
  border: 0;
  color: var(--paper);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.page-faq .acc__trigger:hover {
  background: rgba(16, 31, 58, .55);
}
.page-faq .acc__trigger:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -2px;
}
.page-faq .acc__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
  transition: color .24s var(--ease);
}
.page-faq .acc__item[data-open] .acc__num,
.page-faq .acc__item.is-open .acc__num {
  color: var(--faq-accent);
}
.page-faq .acc__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
}
.page-faq .acc__icon {
  position: relative;
  width: 13px;
  height: 13px;
  flex: 0 0 auto;
  justify-self: end;
}
.page-faq .acc__icon::before,
.page-faq .acc__icon::after {
  content: "";
  position: absolute;
  background: var(--faq-accent);
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}
.page-faq .acc__icon::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}
.page-faq .acc__icon::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}
.page-faq .acc__item[data-open] .acc__icon::after,
.page-faq .acc__item.is-open .acc__icon::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .acc__panel {
  display: block;
}
.page-faq .js .acc__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height .36s var(--ease);
}
.page-faq .js .acc__item[data-open] .acc__panel,
.page-faq .js .acc__item.is-open .acc__panel {
  max-height: 760px;
}

.page-faq .acc__panel-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 0 4px 22px 14px;
}

.page-faq .faq-answer p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper-86);
  max-width: 62ch;
}
.page-faq .faq-num {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: -0.01em;
}

/* 关联页面小卡片 */
.page-faq .faq-jump {
  display: block;
  text-decoration: none;
  background: var(--deep);
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--faq-accent);
  padding: 12px 14px;
  transition: transform .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.page-faq .faq-jump:hover,
.page-faq .faq-jump:focus-visible {
  transform: translateX(3px);
  background: rgba(16, 31, 58, .96);
  border-color: var(--faq-accent);
  outline: none;
}
.page-faq .faq-jump__label {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--stone);
}
.page-faq .faq-jump__name {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}
.page-faq .faq-jump:hover .faq-jump__name,
.page-faq .faq-jump:focus-visible .faq-jump__name {
  color: var(--faq-accent);
}
.page-faq .faq-jump__hint {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--paper-52);
}

/* ---------- 中段插页图 ---------- */
.page-faq .faq-figure {
  margin: 0;
  padding: 0 0 8px;
}
.page-faq .faq-figure__frame {
  position: relative;
  border: 1px solid var(--line-soft);
  background: var(--deep);
  overflow: hidden;
}
.page-faq .faq-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 700;
  object-fit: cover;
  opacity: .88;
}
.page-faq .faq-figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(10, 20, 40, .55), transparent 62%);
  pointer-events: none;
}
.page-faq .faq-figure__cap {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper-52);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-tail {
  padding: 48px 0 64px;
  border-top: 1px solid var(--line-faint);
}
.page-faq .faq-tail__inner {
  display: grid;
  gap: 22px;
  background:
    linear-gradient(135deg, rgba(34, 224, 214, .08), transparent 55%),
    var(--deep);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
  padding: 26px 22px;
}
.page-faq .faq-tail__title {
  margin: 8px 0 10px;
  font-size: var(--step-3);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}
.page-faq .faq-tail__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-70);
  max-width: 46ch;
}
.page-faq .faq-tail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 820px) {
  .page-faq .faq-hero {
    padding-top: 34px;
  }
  .page-faq .faq-hero__top {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }
  .page-faq .faq-hero__stats {
    margin-bottom: 3px;
  }
  .page-faq .faq-index__bar {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 28px;
  }
  .page-faq .faq-index__row {
    justify-content: flex-end;
    overflow-x: visible;
  }
  .page-faq .faq-group {
    padding: 64px 0 52px;
  }
  .page-faq .faq-group__head {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    grid-template-areas:
      "bar eyebrow"
      "bar title"
      "bar lead";
    column-gap: 20px;
    max-width: none;
  }
  .page-faq .faq-group__bar {
    grid-area: bar;
    width: 3px;
    height: 100%;
    min-height: 56px;
    margin: 0;
  }
  .page-faq .faq-group__head .eyebrow {
    grid-area: eyebrow;
  }
  .page-faq .faq-group__title {
    grid-area: title;
    max-width: 26ch;
  }
  .page-faq .faq-group__lead {
    grid-area: lead;
    max-width: 50ch;
  }
  .page-faq .acc__trigger {
    padding: 22px 6px 22px 20px;
    gap: 20px;
  }
  .page-faq .acc__num {
    font-size: 13px;
  }
  .page-faq .acc__title {
    font-size: 18px;
  }
  .page-faq .acc__panel-inner {
    flex-direction: row;
    align-items: flex-start;
    gap: 34px;
    padding: 0 6px 26px 46px;
  }
  .page-faq .acc__panel-inner .faq-answer {
    flex: 1 1 auto;
    min-width: 0;
  }
  .page-faq .acc__panel-inner .faq-jump {
    flex: 0 0 222px;
  }
  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    padding: 34px 32px;
  }
  .page-faq .faq-tail__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-hero__title {
    font-size: clamp(38px, 4.6vw, 58px);
  }
  .page-faq .faq-group__title {
    font-size: clamp(28px, 3vw, 36px);
  }
  .page-faq .faq-figure__cap {
    max-width: 62ch;
  }
  .page-faq .acc__panel-inner .faq-jump {
    flex: 0 0 250px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .acc__item::before,
  .page-faq .acc__icon::before,
  .page-faq .acc__icon::after,
  .page-faq .faq-jump,
  .page-faq .acc__trigger,
  .page-faq .faq-chip {
    transition: none;
  }
  .page-faq .js .acc__panel {
    transition: none;
  }
}