.page-faq {
  --faq-gap: clamp(1.5rem, 4vw, 3.25rem);
  --faq-line: 1px solid var(--c-line);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(2rem, 6vw, 4.25rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
  border-bottom: var(--faq-line);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(59, 247, 203, 0.12), transparent 62%),
    linear-gradient(180deg, rgba(14, 46, 37, 0.55), transparent 78%);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 1.1rem;
}

.page-faq .faq-hero__kicker {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(1.85rem, 5.4vw, 3.3rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--c-white);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 分组跳转 ---------- */
.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.page-faq .faq-jump__item {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.55rem 0.9rem;
  border: var(--faq-line);
  background: rgba(14, 46, 37, 0.5);
  text-decoration: none;
  color: var(--c-white);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-faq .faq-jump__item:hover,
.page-faq .faq-jump__item:focus-visible {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

.page-faq .faq-jump__num {
  font-size: 0.78rem;
  color: var(--c-cyan);
  letter-spacing: 0.06em;
}

.page-faq .faq-jump__item:hover .faq-jump__num,
.page-faq .faq-jump__item:focus-visible .faq-jump__num {
  color: var(--c-cyan);
}

.page-faq .faq-jump__label {
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  position: relative;
  padding: clamp(2.25rem, 6vw, 3.75rem) 0;
  scroll-margin-top: calc(var(--bar-h) + 16px);
}

.page-faq .faq-group + .faq-group {
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 1px;
  background: var(--c-cyan);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.page-faq .faq-group__inner {
  display: grid;
  gap: 1.25rem;
}

.page-faq .faq-group__rail {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.85rem;
  border-bottom: var(--faq-line);
}

.page-faq .faq-group__num {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-cyan);
  letter-spacing: -0.02em;
}

.page-faq .faq-group__tag {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--c-muted);
}

.page-faq .faq-group__body {
  min-width: 0;
}

.page-faq .faq-group__title {
  margin: 0 0 0.85rem;
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.24;
  color: var(--c-white);
}

.page-faq .faq-group__lede {
  margin: 0 0 1.75rem;
  max-width: 62ch;
  font-size: 0.97rem;
  line-height: 1.78;
  color: var(--c-muted);
}

.page-faq .faq-group__lede a {
  color: var(--c-cyan);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 0 0 1.9rem;
  border: var(--faq-line);
  background: var(--c-stand);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
  filter: saturate(0.92) contrast(1.04);
}

.page-faq .faq-figure__cap {
  padding: 0.7rem 1rem;
  border-top: var(--faq-line);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--c-dim);
}

/* ---------- 问答列表 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 0;
  border-top: var(--faq-line);
}

.page-faq .faq-item {
  border-bottom: var(--faq-line);
}

.page-faq .faq-item + .faq-item {
  margin-top: 0;
}

.page-faq .faq-item__q {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 0.85rem;
  padding: 1.05rem 0.15rem 1.05rem 0;
  cursor: pointer;
  list-style: none;
  transition: color 0.16s var(--ease);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--c-dim);
  padding-top: 0.2rem;
  transition: color 0.16s var(--ease), transform 0.2s var(--ease);
}

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--c-cyan);
}

.page-faq .faq-item__q:hover::after,
.page-faq .faq-item__q:focus-visible::after {
  color: var(--c-cyan);
}

.page-faq .faq-item__idx {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  padding-top: 0.32rem;
}

.page-faq .faq-item__text {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.62;
  color: var(--c-white);
}

.page-faq .faq-item[open] > .faq-item__q .faq-item__text {
  color: var(--c-white);
}

.page-faq .faq-item__a {
  padding: 0 0.15rem 0 0;
  margin: 0 0 1.15rem;
  border-left: 2px solid transparent;
  padding-left: 0;
}

.page-faq .faq-item[open] > .faq-item__a {
  border-left-color: var(--c-cyan);
  padding-left: 0.95rem;
  animation: faq-reveal 0.28s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-item__a a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 0.22em;
  text-decoration-thickness: 1px;
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  color: var(--c-orange);
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 结尾 ---------- */
.page-faq .faq-coda {
  border-top: var(--faq-line);
  background: linear-gradient(180deg, rgba(14, 46, 37, 0.6), rgba(6, 26, 20, 0.85));
}

.page-faq .faq-coda__inner {
  display: grid;
  gap: 0.7rem;
  padding-top: clamp(2rem, 5vw, 3.25rem);
  padding-bottom: clamp(2rem, 5vw, 3.25rem);
  justify-items: start;
}

.page-faq .faq-coda__text {
  margin: 0;
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-faq .faq-coda__sub {
  margin: 0 0 0.5rem;
  max-width: 58ch;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 860px) {
  .page-faq .faq-group__inner {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 2.75rem;
  }

  .page-faq .faq-group__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    position: sticky;
    top: calc(var(--bar-h) + 2rem);
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
    padding-left: 1rem;
    align-self: start;
  }

  .page-faq .faq-group__num {
    font-size: clamp(2.2rem, 3.6vw, 3.1rem);
  }

  .page-faq .faq-group__tag {
    font-size: 0.76rem;
    line-height: 1.55;
    letter-spacing: 0.14em;
  }

  .page-faq .faq-item__q {
    padding: 1.25rem 0.25rem 1.25rem 0;
  }

  .page-faq .faq-item__text {
    font-size: 1.05rem;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-group__inner {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 3.5rem;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 34ch);
    grid-template-areas:
      "kicker kicker"
      "title lede"
      "jump jump";
    column-gap: 3rem;
  }

  .page-faq .faq-hero__kicker {
    grid-area: kicker;
  }

  .page-faq .faq-hero__title {
    grid-area: title;
    max-width: 20ch;
  }

  .page-faq .faq-hero__lede {
    grid-area: lede;
    align-self: end;
    font-size: 0.98rem;
  }

  .page-faq .faq-jump {
    grid-area: jump;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] > .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item__q::after,
  .page-faq .faq-jump__item,
  .page-faq .faq-item__q {
    transition: none;
  }
}