.page-faq {
  --faq-hero-max: 54ch;
  display: block;
  background: var(--ink);
  color: var(--white);
  font-family: var(--sans);
}

/* ---------- 首屏：主题声明 + 分组索引 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 52px) 0 clamp(40px, 7vw, 80px);
  background:
    radial-gradient(120% 90% at 92% 4%, rgba(46, 230, 182, .16) 0%, rgba(46, 230, 182, 0) 54%),
    radial-gradient(90% 80% at 2% 102%, rgba(255, 90, 31, .16) 0%, rgba(255, 90, 31, 0) 58%),
    linear-gradient(168deg, var(--deep) 0%, var(--ink) 66%);
  border-bottom: var(--bw) solid var(--line-strong);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(201, 214, 209, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 214, 209, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .85), transparent 76%);
  pointer-events: none;
}

.page-faq .faq-hero .container {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 52px);
  margin-top: clamp(22px, 4vw, 40px);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(31px, 6.4vw, 60px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.03em;
  color: var(--white);
}

.page-faq .faq-hero .lede {
  margin: 20px 0 0;
  max-width: var(--faq-hero-max);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-hints {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 26px 0 0;
  padding: 10px 14px;
  border: var(--bw) solid var(--line-strong);
  border-left-color: var(--orange);
  background: rgba(10, 58, 49, .62);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-hints .mono {
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-faq .faq-hero__index {
  border: var(--bw) solid var(--line-strong);
  background: rgba(1, 21, 18, .74);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-hero__index-label {
  margin: 0;
  padding: 11px 16px;
  background: var(--orange);
  color: var(--deep);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  border-bottom: var(--bw) solid var(--line-strong);
}

.page-faq .faq-toc {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.page-faq .faq-toc__link {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color .18s ease, color .18s ease, padding-left .18s ease;
}

.page-faq .faq-toc__link .mono {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--cyan);
  transition: color .18s ease;
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  background: var(--orange);
  color: var(--deep);
  padding-left: 24px;
}

.page-faq .faq-toc__link:hover .mono,
.page-faq .faq-toc__link:focus-visible .mono {
  color: var(--deep);
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  padding: clamp(46px, 8vw, 94px) 0;
  border-top: var(--bw) solid var(--line-strong);
  scroll-margin-top: 108px;
}

.page-faq .faq-group--panel { background: var(--panel); }
.page-faq .faq-group--deep { background: var(--deep); }
.page-faq .faq-group--accent { border-top-color: var(--orange); }

.page-faq .faq-group__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 42px);
}

.page-faq .faq-group__rail {
  padding-left: 16px;
  border-left: var(--bw) solid var(--orange);
}

.page-faq .faq-group__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(42px, 8vw, 68px);
  font-weight: 700;
  line-height: .86;
  letter-spacing: -.05em;
  color: var(--orange);
}

.page-faq .faq-group__rail-title {
  margin: 14px 0 0;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--white);
}

.page-faq .faq-group__rail-note {
  margin: 8px 0 0;
  max-width: 26ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 36px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-group__lede {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 可展开问答 ---------- */

.page-faq .faq-list {
  margin-top: clamp(22px, 3vw, 32px);
  border-top: var(--bw) solid var(--line-strong);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
  transition: background-color .18s ease;
}

.page-faq .faq-item:has(.faq-item__trigger[aria-expanded="true"]) {
  background: rgba(255, 90, 31, .07);
}

.page-faq .faq-item__head {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .faq-item__trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 14px;
  width: 100%;
  padding: clamp(16px, 2.4vw, 22px) clamp(6px, 1.4vw, 14px);
  background: none;
  border: 0;
  color: var(--white);
  font-family: inherit;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.45;
  text-align: left;
  cursor: pointer;
  transition: color .18s ease;
}

.page-faq .faq-item__trigger:hover,
.page-faq .faq-item__trigger:focus-visible {
  color: var(--orange-soft);
}

.page-faq .faq-item__trigger[aria-expanded="true"] {
  color: var(--orange);
}

.page-faq .faq-item__no {
  padding-top: 5px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .faq-item__q {
  display: block;
}

.page-faq .faq-item__mark {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border: var(--bw) solid currentColor;
  transition: transform .2s ease, background-color .2s ease, border-color .2s ease, color .2s ease;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: opacity .2s ease;
}

.page-faq .faq-item__mark::before {
  left: 3px;
  right: 3px;
  top: 50%;
  height: 2px;
  margin-top: -1px;
}

.page-faq .faq-item__mark::after {
  top: 3px;
  bottom: 3px;
  left: 50%;
  width: 2px;
  margin-left: -1px;
}

.page-faq .faq-item__trigger[aria-expanded="true"] .faq-item__mark {
  transform: rotate(180deg);
  background: var(--orange);
  border-color: var(--orange);
  color: var(--deep);
}

.page-faq .faq-item__trigger[aria-expanded="true"] .faq-item__mark::after {
  opacity: 0;
}

.page-faq .faq-item__panel {
  padding: 0 clamp(6px, 1.4vw, 14px) clamp(18px, 2.6vw, 26px) clamp(34px, 6vw, 52px);
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.page-faq .faq-item__panel p {
  margin: 0;
  max-width: 68ch;
}

.page-faq .faq-item__panel a {
  color: var(--orange-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-item__panel a:hover {
  color: var(--orange);
}

/* ---------- 分组内配图 ---------- */

.page-faq .faq-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
  border: var(--bw) solid var(--line-strong);
  background: var(--deep);
  box-shadow: var(--shadow-hard);
}

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

.page-faq .faq-figure__caption {
  padding: 10px 14px;
  border-top: var(--bw) solid var(--line-strong);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 收束区 ---------- */

.page-faq .faq-next {
  padding: clamp(44px, 7vw, 86px) 0;
  background:
    linear-gradient(120deg, rgba(255, 90, 31, .12) 0%, rgba(255, 90, 31, 0) 52%),
    var(--deep);
  border-top: var(--bw) solid var(--orange);
}

.page-faq .faq-next__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
  align-items: center;
}

.page-faq .faq-next h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-next p {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-faq .faq-item__trigger {
    gap: 18px;
  }
}

@media (min-width: 880px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
    align-items: end;
  }

  .page-faq .faq-group__grid {
    grid-template-columns: minmax(152px, .3fr) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 76px);
    align-items: start;
  }

  .page-faq .faq-group__rail {
    position: sticky;
    top: 112px;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-next__inner {
    grid-template-columns: minmax(0, 1.5fr) auto;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-item__trigger {
    grid-template-columns: minmax(0, 1fr) auto;
    row-gap: 6px;
  }

  .page-faq .faq-item__no {
    grid-column: 1 / -1;
    padding-top: 0;
  }

  .page-faq .faq-item__panel {
    padding-left: clamp(6px, 1.4vw, 14px);
  }
}