.page-faq {
  --faq-rail-w: 232px;
  --faq-panel-bg: #ffffff;
  --faq-soft-ink: rgba(46, 58, 54, .72);
  background: var(--cool-white);
  color: var(--graphite);
}

.page-faq a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--step) * 6) 0 calc(var(--step) * 5);
  background:
    linear-gradient(158deg, var(--pitch-ink) 0%, var(--pitch-line) 58%, #0a3a2f 100%);
  color: var(--cool-white);
}

.page-faq .faq-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 60%;
  opacity: .26;
  filter: saturate(.65);
  z-index: -2;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: repeating-linear-gradient(102deg,
      rgba(34, 224, 184, .07) 0 2px,
      transparent 2px 16px);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(7, 18, 15, .52) 0%, rgba(7, 18, 15, .88) 78%),
    linear-gradient(104deg, transparent 0 58%, rgba(34, 224, 184, .18) 58% 100%);
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
}

.page-faq .faq-hero .breadcrumbs {
  font-size: .8125rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--light-60);
}

.page-faq .faq-hero .breadcrumbs a {
  color: var(--light-80);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

.page-faq .faq-hero .breadcrumbs a:hover {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
}

.page-faq .faq-hero .eyebrow {
  margin: 1.5rem 0 0;
  color: var(--neon-cyan);
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.page-faq .faq-hero .display-title {
  margin: .75rem 0 0;
  color: var(--cool-white);
  max-width: 20ch;
}

.page-faq .faq-hero .lede {
  margin: 1rem 0 0;
  max-width: 60ch;
  color: var(--light-80);
  line-height: 1.75;
}

.page-faq .faq-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.5rem;
}

/* ---------- 筛选栏 ---------- */
.page-faq .faq-tools {
  padding: calc(var(--step) * 5) 0 calc(var(--step) * 3);
  background: var(--cool-white);
  border-bottom: 1px solid var(--mist-gray);
}

.page-faq .faq-tools-head {
  display: grid;
  gap: .5rem;
  margin-bottom: 1.25rem;
}

.page-faq .faq-tools-head .section-title {
  margin: 0;
}

.page-faq .faq-tools-head .prose {
  margin: 0;
  color: var(--faq-soft-ink);
}

.page-faq .faq-filter-row {
  flex-wrap: wrap;
  gap: .5rem;
}

.page-faq .faq-filter-row .chip {
  cursor: pointer;
  font: inherit;
  font-size: .875rem;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: block;
  padding: calc(var(--step) * 4) 0 calc(var(--step) * 7);
}

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

.page-faq .faq-flow {
  display: grid;
  gap: calc(var(--step) * 6);
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-faq .faq-group {
  position: relative;
  min-width: 0;
}

.page-faq .faq-group-head {
  display: grid;
  gap: .35rem;
  margin-bottom: 1.125rem;
}

.page-faq .faq-group-head .section-index {
  position: static;
  display: inline-block;
  transform: none;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .2em;
  color: var(--signal-orange);
  transition: color .3s var(--ease);
}

.page-faq .faq-group.is-active .section-index {
  color: var(--neon-cyan);
}

.page-faq .faq-group-head .section-title {
  margin: 0;
}

.page-faq .faq-group-lede {
  margin: 0;
  max-width: 60ch;
  font-size: .9875rem;
  line-height: 1.72;
  color: var(--faq-soft-ink);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-flow .accordion {
  display: grid;
  gap: .5rem;
}

.page-faq .faq-flow .accordion-item {
  background: var(--faq-panel-bg);
  border: 1px solid var(--mist-gray);
  border-radius: var(--radius-cut);
  overflow: hidden;
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-color .24s var(--ease);
}

.page-faq .faq-flow .accordion-item:hover {
  transform: translateY(-2px);
  border-color: rgba(34, 224, 184, .55);
  box-shadow: 0 14px 30px -22px rgba(7, 18, 15, .7);
}

.page-faq .faq-flow .accordion-item.is-open {
  border-color: var(--neon-cyan);
}

.page-faq .faq-q {
  margin: 0;
  font-size: 1rem;
  font-weight: 400;
}

.page-faq .faq-flow .accordion-trigger {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 1.1rem;
  background: none;
  border: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--pitch-ink);
  text-align: left;
  cursor: pointer;
  transition: color .24s var(--ease);
}

.page-faq .faq-flow .accordion-trigger:hover {
  color: var(--pitch-line);
}

.page-faq .faq-flow .accordion-trigger:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: -3px;
}

.page-faq .faq-q-mark {
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: .28rem;
  border: 1px solid var(--mist-gray);
  border-radius: 2px;
  transition: border-color .24s var(--ease);
}

.page-faq .faq-q-mark::before,
.page-faq .faq-q-mark::after {
  content: "";
  position: absolute;
  background: var(--pitch-line);
  transition: background .24s var(--ease), transform .24s var(--ease);
}

.page-faq .faq-q-mark::before {
  left: 4px;
  right: 4px;
  top: 8px;
  height: 2px;
}

.page-faq .faq-q-mark::after {
  top: 4px;
  bottom: 4px;
  left: 8px;
  width: 2px;
}

.page-faq .accordion-item.is-open .faq-q-mark {
  border-color: var(--neon-cyan);
}

.page-faq .accordion-item.is-open .faq-q-mark::before {
  background: var(--neon-cyan);
}

.page-faq .accordion-item.is-open .faq-q-mark::after {
  transform: scaleY(0);
}

.page-faq .faq-flow .accordion-panel {
  padding: 0 1.1rem 1.15rem;
}

.page-faq .faq-flow .accordion-panel p {
  margin: 0;
  padding-top: .85rem;
  border-top: 1px solid var(--mist-gray);
  max-width: 64ch;
  line-height: 1.78;
  color: var(--faq-soft-ink);
}

.page-faq .faq-flow .accordion-panel a {
  color: var(--pitch-line);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid var(--neon-cyan);
}

.page-faq .faq-flow .accordion-panel a:hover {
  color: var(--signal-orange);
  border-bottom-color: var(--signal-orange);
}

.page-faq .faq-flow [data-filter-item].is-hidden {
  display: none;
}

/* ---------- 四级阶梯 ---------- */
.page-faq .faq-ladder {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.page-faq .faq-ladder-figure {
  margin: 0;
  background: linear-gradient(150deg, var(--pitch-ink), var(--pitch-line));
  border: 1px solid var(--mist-gray);
  border-radius: var(--radius-cut);
  overflow: hidden;
}

.page-faq .faq-ladder-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-ladder-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

.page-faq .faq-ladder-list li {
  padding: .7rem .85rem;
  background: var(--faq-panel-bg);
  border: 1px solid var(--mist-gray);
  border-left: 3px solid var(--pitch-line);
  border-radius: var(--radius-cut);
  transition: transform .24s var(--ease), border-left-color .24s var(--ease);
}

.page-faq .faq-ladder-list li:hover {
  transform: translateX(3px);
  border-left-color: var(--neon-cyan);
}

.page-faq .faq-ladder-list strong {
  margin-left: .5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--pitch-ink);
}

.page-faq .faq-ladder-list li > span:last-child {
  display: block;
  margin-top: .3rem;
  font-size: .9375rem;
  line-height: 1.65;
  color: var(--faq-soft-ink);
}

/* ---------- 收口 ---------- */
.page-faq .faq-help {
  display: grid;
  gap: 1.25rem;
  padding: 1.5rem;
}

.page-faq .faq-help .card-title {
  margin: 0 0 .5rem;
  color: var(--cool-white);
}

.page-faq .faq-help-copy p {
  margin: 0;
  max-width: 56ch;
  line-height: 1.78;
  color: var(--light-80);
}

.page-faq .faq-help-list {
  list-style: none;
  margin: 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line-light);
  display: grid;
  gap: .6rem;
}

.page-faq .faq-help-list li {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: .5rem;
  align-items: baseline;
  font-size: .9375rem;
  color: var(--light-80);
  overflow-wrap: anywhere;
}

.page-faq .faq-help-key {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.page-faq .faq-help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 侧栏目录（桌面端） ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: calc(var(--step) * 8) 0 calc(var(--step) * 7);
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: calc(var(--step) * 5);
    align-items: start;
  }

  .page-faq .faq-rail {
    display: block;
    position: sticky;
    top: 104px;
    padding-left: 1rem;
    border-left: 2px solid var(--mist-gray);
  }

  .page-faq .faq-rail-title {
    margin: 0 0 .75rem;
    font-family: var(--font-display);
    font-size: .8125rem;
    font-weight: 800;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--ink-50);
  }

  .page-faq .faq-rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: .125rem;
  }

  .page-faq .faq-rail-list a {
    display: block;
    margin-left: -1rem;
    padding: .48rem .25rem .48rem 1rem;
    font-size: .9375rem;
    color: var(--graphite);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: color .24s var(--ease), border-color .24s var(--ease), background .24s var(--ease);
  }

  .page-faq .faq-rail-list a:hover,
  .page-faq .faq-rail-list a:focus-visible {
    color: var(--pitch-ink);
    border-left-color: var(--neon-cyan);
    background: rgba(34, 224, 184, .12);
    outline: none;
  }

  .page-faq .faq-rail-help {
    margin-top: 1.5rem;
    padding: .875rem;
    background: var(--faq-panel-bg);
    border: 1px solid var(--mist-gray);
    border-radius: var(--radius-cut);
  }

  .page-faq .faq-rail-help p {
    margin: 0 0 .625rem;
    font-size: .875rem;
    color: var(--faq-soft-ink);
  }

  .page-faq .faq-group {
    padding-left: 1.75rem;
  }

  .page-faq .faq-group::before {
    content: "";
    position: absolute;
    left: 0;
    top: .4rem;
    bottom: .4rem;
    width: 3px;
    background: var(--mist-gray);
    transition: background .3s var(--ease), box-shadow .3s var(--ease);
  }

  .page-faq .faq-group.is-active::before {
    background: var(--neon-cyan);
    box-shadow: 0 0 14px rgba(34, 224, 184, .55);
  }

  .page-faq .faq-help {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-help-copy {
    grid-column: 1;
  }

  .page-faq .faq-help-list {
    grid-column: 2;
    grid-row: 1;
    padding-top: 0;
    border-top: 0;
    border-left: 1px solid var(--line-light);
    padding-left: 1.25rem;
  }

  .page-faq .faq-help-actions {
    grid-column: 1 / -1;
    border-top: 1px solid var(--line-light);
    padding-top: 1.25rem;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-ladder {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
    gap: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }
}