.page-faq {
  --faq-rail-w: 248px;
  display: block;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  letter-spacing: .01em;
  padding-bottom: clamp(48px, 7vw, 96px);
  overflow-x: hidden;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--black);
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-faq .faq-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% 50%;
  opacity: .4;
  filter: grayscale(.4) contrast(1.08);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 9, 15, .88) 0%, rgba(11, 26, 46, .93) 56%, var(--ink) 100%),
    radial-gradient(120% 90% at 88% 12%, rgba(201, 162, 39, .16), transparent 62%);
}

.page-faq .faq-hero__ticks {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 16px;
  z-index: 2;
  border-bottom: 1px solid var(--hair);
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 26px);
  opacity: .8;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 3;
  padding-top: clamp(40px, 5.6vw, 72px);
  padding-bottom: clamp(32px, 5vw, 66px);
}

.page-faq .faq-hero .breadcrumbs {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-faq .faq-hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  max-width: 24ch;
  font-size: clamp(29px, 5.1vw, 52px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.7;
  color: rgba(243, 240, 233, .8);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3.4vw, 52px);
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-faq .faq-hero__stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-body {
  padding-top: clamp(28px, 4.4vw, 58px);
}

.page-faq .faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 44px);
  align-items: start;
}

/* ---------- 左侧索引轨道 ---------- */
.page-faq .faq-rail {
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-faq .faq-rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 8px 11px 12px;
  border-left: 1px solid var(--line);
  color: var(--steel);
  font-size: 14px;
  line-height: 1.35;
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .faq-rail__link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 1px;
  height: 0;
  background: var(--gold);
  transform: translateY(-50%);
  transition: height .2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--gold-hi);
  border-left-color: var(--line-strong);
}

.page-faq .faq-rail__link:hover::before,
.page-faq .faq-rail__link:focus-visible::before {
  height: 26px;
}

.page-faq .faq-rail__tick {
  flex: 0 0 auto;
  width: 12px;
  height: 1px;
  background: var(--line-strong);
}

.page-faq .faq-rail__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-faq .faq-rail__name {
  flex: 1 1 auto;
}

.page-faq .faq-rail__count {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: .72;
}

.page-faq .faq-rail__cta {
  display: inline-block;
  margin-bottom: 10px;
}

.page-faq .faq-rail__hint {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 分类区块 ---------- */
.page-faq .faq-cat {
  margin-bottom: clamp(34px, 5vw, 60px);
  scroll-margin-top: 96px;
}

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

.page-faq .faq-cat__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-cat__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.8vw, 42px);
  font-weight: 800;
  line-height: 1;
  color: rgba(201, 162, 39, .18);
  -webkit-text-stroke: 1px var(--gold);
  transition: color .24s var(--ease), -webkit-text-stroke-color .24s var(--ease);
}

.page-faq [data-chapter].is-current .faq-cat__num {
  color: rgba(240, 201, 74, .3);
  -webkit-text-stroke-color: var(--gold-hi);
}

.page-faq .faq-cat__title {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 27px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--paper);
}

.page-faq [data-chapter].is-current .faq-cat__title {
  color: var(--gold-hi);
}

.page-faq .faq-cat__note {
  margin: 10px 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  position: relative;
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gold);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .2s var(--ease);
}

.page-faq .faq-item:hover::before,
.page-faq .faq-item[open]::before {
  transform: scaleY(1);
}

.page-faq .faq-item[open] {
  background: var(--ink-3);
}

.page-faq .faq-q {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 10px 16px 12px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
  transition: color .18s var(--ease);
}

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

.page-faq .faq-q:hover {
  color: var(--gold-hi);
}

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

.page-faq .faq-q__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  align-self: center;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, .14);
}

.page-faq .faq-item[open] .faq-q__dot {
  background: var(--gold-hi);
  box-shadow: 0 0 0 4px rgba(240, 201, 74, .18);
}

.page-faq .faq-q__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-faq .faq-q__text {
  flex: 1 1 auto;
}

.page-faq .faq-q__sign {
  flex: 0 0 auto;
  width: 20px;
  text-align: center;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--steel);
  transition: transform .2s var(--ease), color .2s var(--ease);
}

.page-faq .faq-item[open] .faq-q__sign {
  transform: rotate(45deg);
  color: var(--gold-hi);
}

.page-faq .faq-a {
  padding: 0 12px 22px 30px;
  font-size: 15.5px;
  line-height: 1.72;
  color: rgba(243, 240, 233, .86);
}

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

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

.page-faq .faq-a strong {
  color: var(--gold);
  font-family: var(--font-mono);
  font-weight: 700;
}

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

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

.page-faq .faq-ul {
  margin: 0 0 10px;
  padding-left: 18px;
  list-style: none;
}

.page-faq .faq-ul li {
  position: relative;
  margin-bottom: 6px;
}

.page-faq .faq-ul li::before {
  content: "";
  position: absolute;
  left: -14px;
  top: .72em;
  width: 6px;
  height: 1px;
  background: var(--steel);
}

.page-faq .faq-note {
  margin-top: 12px;
  padding: 12px 16px 12px 14px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--steel);
  background: var(--ink-2);
  border-left: 2px solid var(--green);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-faq .faq-note--warn {
  border-left-color: var(--orange);
}

.page-faq .faq-note a {
  color: var(--gold-hi);
}

/* ---------- 勘误配图 ---------- */
.page-faq .faq-errata {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0 0 22px;
}

.page-faq .faq-errata__media {
  background: var(--black);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-errata__media img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: .88;
  filter: grayscale(.3) contrast(1.06);
}

.page-faq .faq-errata__cap {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(243, 240, 233, .78);
}

.page-faq .faq-errata__step {
  display: inline-block;
  margin-right: 8px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--paper);
  background: var(--ink-2);
  border-left: 2px solid var(--orange);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-a {
    padding: 0 18px 24px 44px;
  }

  .page-faq .faq-q {
    padding: 18px 14px 18px 18px;
    gap: 14px;
  }

  .page-faq .faq-errata {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-grid {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 4vw, 72px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    max-height: calc(100vh - 128px);
    overflow-y: auto;
    padding-right: 6px;
  }

  .page-faq .faq-hero h1 {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-rail__link,
  .page-faq .faq-rail__link::before,
  .page-faq .faq-q,
  .page-faq .faq-q__sign,
  .page-faq .faq-cat__num {
    transition: none;
  }
}