.page-faq {
  --faq-rail-mobile: 2.25rem;
  --faq-rail-desktop: 4rem;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: 2.25rem 0 1.5rem;
}

.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold);
}

.page-faq .faq-hero__eyebrow {
  margin: 1.75rem 0 .75rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-faq .faq-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 8vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-hero__lead {
  margin: 0 0 1.75rem;
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 分组索引条 ---------- */

.page-faq .faq-index {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--hold);
  color: var(--white);
  font-size: .85rem;
  line-height: 1;
  text-decoration: none;
  transition: border-color .2s ease, color .2s ease, transform .2s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--gold);
  color: var(--gold-hi);
  transform: translateY(-1px);
}

.page-faq .faq-index__id {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--gold);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  padding: 2.25rem 0;
  border-top: 1px solid var(--grid);
  scroll-margin-top: 7.5rem;
}

.page-faq .faq-group__inner {
  display: grid;
  grid-template-columns: var(--faq-rail-mobile) minmax(0, 1fr);
  gap: 1rem;
}

.page-faq .faq-group__rail {
  border-right: 1px solid var(--line);
  padding-top: .35rem;
}

.page-faq .faq-group__letter {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-faq .faq-group__head h2 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-group__lead {
  margin: 0 0 1.5rem;
  max-width: 58ch;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-inline {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-faq .faq-inline:hover,
.page-faq .faq-inline:focus-visible {
  color: var(--white);
}

/* ---------- 图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 1.5rem;
}

.page-faq .faq-group__aside .faq-figure {
  margin-bottom: 0;
}

.page-faq .faq-group__grid {
  display: grid;
  gap: 1.5rem;
}

/* ---------- 折叠面板 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: .75rem;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: var(--hold);
  box-shadow: var(--shadow-soft);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.page-faq .faq-item[open] {
  border-left-color: var(--gold);
  transform: translateY(2px);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, .45);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  padding: .9rem 1rem;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: .98rem;
  line-height: 1.55;
  color: var(--white);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: -2px;
}

.page-faq .faq-item__mark {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--gold);
  font-weight: 400;
}

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

.page-faq .faq-item__sign {
  position: relative;
  flex: 0 0 auto;
  align-self: center;
  width: 14px;
  height: 14px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--gold);
  transform: translate(-50%, -50%);
}

.page-faq .faq-item__sign::before {
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__sign::after {
  width: 2px;
  height: 14px;
  transition: transform .2s ease, opacity .2s ease;
}

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: .75rem 1rem 1.1rem;
  border-top: 1px solid var(--grid);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 66ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 中段留白与环形示意 ---------- */

.page-faq .faq-breather {
  padding: 4.5rem 0;
}

.page-faq .faq-breather__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.page-faq .faq-ring__svg {
  display: block;
  width: min(260px, 66vw);
  height: auto;
}

.page-faq .faq-ring__track {
  fill: none;
  stroke: var(--grid);
  stroke-width: 14;
}

.page-faq .faq-ring__arc {
  fill: none;
  stroke-width: 14;
  stroke-linecap: butt;
}

.page-faq .faq-ring__arc--a { stroke: var(--gold); }
.page-faq .faq-ring__arc--b { stroke: var(--gold-hi); }
.page-faq .faq-ring__arc--c { stroke: var(--amber); }
.page-faq .faq-ring__arc--d { stroke: var(--teal); }
.page-faq .faq-ring__arc--e { stroke: var(--mist); }

.page-faq .faq-ring__num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 900;
  fill: var(--white);
  text-anchor: middle;
}

.page-faq .faq-ring__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  fill: var(--gold);
  text-anchor: middle;
}

.page-faq .faq-ring__cap {
  margin: 0;
  max-width: 40ch;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 尾部求助 ---------- */

.page-faq .faq-help {
  padding: 0 0 4.5rem;
}

.page-faq .faq-help__box {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.75rem 1.5rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  background: var(--hold);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-help__text h2 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  line-height: 1.3;
  color: var(--white);
}

.page-faq .faq-help__text p {
  margin: 0;
  max-width: 60ch;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-help__box .btn {
  align-self: flex-start;
  text-decoration: none;
}

/* ---------- 窄屏微调 ---------- */

@media (max-width: 479px) {
  .page-faq .faq-group__inner {
    grid-template-columns: 1.5rem minmax(0, 1fr);
    gap: .75rem;
  }

  .page-faq .faq-item__q {
    font-size: .93rem;
    gap: .55rem;
  }
}

/* ---------- 平板及桌面 ---------- */

@media (min-width: 768px) {
  .page-faq .faq-hero {
    padding: 3rem 0 2rem;
  }

  .page-faq .faq-group {
    padding: 3rem 0;
  }

  .page-faq .faq-group__inner {
    grid-template-columns: var(--faq-rail-desktop) minmax(0, 1fr);
    gap: 2.25rem;
  }

  .page-faq .faq-group__rail {
    padding-top: .5rem;
  }

  .page-faq .faq-group__letter {
    font-size: 1.5rem;
  }

  .page-faq .faq-item__q {
    padding: 1.05rem 1.25rem;
  }

  .page-faq .faq-item__a {
    padding: .85rem 1.25rem 1.3rem;
  }

  .page-faq .faq-help__box {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    padding: 2rem;
  }

  .page-faq .faq-help__box .btn {
    flex: 0 0 auto;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-breather {
    padding: 8rem 0;
  }

  .page-faq .faq-group__grid {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
    gap: 2rem;
  }

  .page-faq .faq-ring__svg {
    width: 300px;
  }
}

/* ---------- 动效降级 ---------- */

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

  .page-faq .faq-item[open] {
    transform: none;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    transform: none;
  }
}