.page-faq {
  --faq-rail-w: 216px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 100% at 84% 0%, rgba(44, 107, 87, .34), transparent 60%),
    linear-gradient(180deg, var(--stand) 0%, var(--ink) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-faint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-faint) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: .85;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(34px, 5.5vw, 68px) 0 clamp(28px, 4vw, 52px);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--lime);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 15ch;
  color: var(--chalk);
  font-size: clamp(34px, 6.6vw, 78px);
  line-height: 1.04;
  letter-spacing: .04em;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--index);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 24px;
}

.page-faq .faq-hero__meta span {
  padding: 6px 12px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--lime);
  background: rgba(18, 51, 42, .55);
  color: var(--index);
  font-size: 12px;
  letter-spacing: .1em;
}

.page-faq .faq-hero__figure {
  margin: 0;
  align-self: end;
}

/* ---------- 正文骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  padding: clamp(30px, 4.6vw, 60px) 0 clamp(46px, 7vw, 88px);
}

/* ---------- 侧栏跳转 ---------- */
.page-faq .faq-rail {
  position: static;
  padding-left: 0;
  border-left: 1px solid var(--line-soft);
}

.page-faq .faq-rail .toc__title {
  margin: 0;
  padding-left: 14px;
  color: var(--index);
}

.page-faq .faq-rail .toc__list {
  display: grid;
  gap: 2px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail .toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  color: var(--index);
  font-size: 14px;
  text-decoration: none;
  transition:
    color var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    background var(--speed) var(--ease);
}

.page-faq .faq-rail .toc__link .mono {
  color: var(--shade);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-faq .faq-rail .toc__link:hover,
.page-faq .faq-rail .toc__link:focus-visible {
  color: var(--chalk);
  border-left-color: var(--lime);
  background: rgba(18, 51, 42, .62);
}

.page-faq .faq-rail .toc__link.is-current {
  color: var(--lime);
  border-left-color: var(--lime);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 5vw, 68px);
}

.page-faq .faq-group__head {
  margin-bottom: clamp(14px, 2.2vw, 24px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-group__no {
  display: block;
  margin-bottom: 10px;
  color: var(--lime);
  font-size: 12px;
  letter-spacing: .2em;
}

.page-faq .faq-group__title {
  margin: 0;
  color: var(--chalk);
  font-size: clamp(21px, 2.9vw, 31px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: .02em;
}

.page-faq .faq-group__desc {
  margin: 10px 0 0;
  max-width: 64ch;
  color: var(--index);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 折叠问答 ---------- */
.page-faq .accordion__item {
  border-bottom: 1px solid var(--line-faint);
  transition: background var(--speed) var(--ease);
}

.page-faq .accordion__item[data-open] {
  background: linear-gradient(90deg, rgba(198, 255, 61, .08), transparent 46%);
}

.page-faq .accordion__trigger {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 16px 0;
  border: 0;
  background: none;
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  text-align: left;
  cursor: pointer;
  transition: color var(--speed) var(--ease);
}

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

.page-faq .accordion__no {
  flex: 0 0 auto;
  min-width: 34px;
  padding-top: 3px;
  color: var(--index);
  font-size: 12px;
  letter-spacing: .12em;
}

.page-faq .accordion__item[data-open] .accordion__no,
.page-faq .accordion__item[data-open] .accordion__trigger {
  color: var(--lime);
}

.page-faq .accordion__panel {
  padding: 0 0 20px 48px;
  color: var(--index);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .accordion__panel p {
  margin: 0 0 10px;
}

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

.page-faq .accordion__item:not([data-open]) > .accordion__panel {
  display: none;
}

/* ---------- 文内配图 ---------- */
.page-faq .faq-group__figure {
  margin: 22px 0 0;
}

.page-faq .frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 结尾 ---------- */
.page-faq .faq-tail {
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--stand) 0%, var(--ink) 100%);
}

.page-faq .faq-tail__inner {
  display: grid;
  gap: 22px;
  padding: clamp(34px, 5vw, 62px) 0;
}

.page-faq .faq-tail__title {
  margin: 10px 0 0;
  color: var(--chalk);
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 600;
  line-height: 1.32;
}

.page-faq .faq-tail__text {
  margin: 10px 0 0;
  max-width: 60ch;
  color: var(--index);
  font-size: 15px;
  line-height: 1.78;
}

.page-faq .faq-tail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 860px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 400px);
    align-items: end;
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-faq .faq-tail__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 40px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
    column-gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .accordion__trigger,
  .page-faq .accordion__item,
  .page-faq .faq-rail .toc__link {
    transition: none;
  }
}