.page-faq {
  --faq-index-w: 250px;
  --faq-sticky-top: calc(var(--header-h, 80px) + 5rem);
  background: var(--ink-900);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
  background:
    radial-gradient(120% 100% at 10% 0%, rgba(18, 70, 62, 0.7) 0%, rgba(10, 14, 12, 0) 62%),
    var(--ink-900);
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.75rem);
  line-height: 1.12;
  letter-spacing: 0.01em;
  font-weight: 700;
  color: var(--paper);
  margin: 0.6rem 0 0;
  max-width: 22ch;
}

.page-faq .faq-hero__lede {
  margin: 1.25rem 0 0;
  max-width: 64ch;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.8;
  color: var(--text);
}

.page-faq .faq-hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 3.5vw, 2.75rem) 0 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-hero__meta-cell {
  background: var(--ink-900);
  padding: 0.85rem 1rem 0.95rem;
}

.page-faq .faq-hero__meta-cell dt {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .faq-hero__meta-cell dd {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  color: var(--cyan);
}

/* ---------- 分类带 ---------- */
.page-faq .faq-cats {
  position: sticky;
  top: var(--header-h, 80px);
  z-index: 20;
  background: rgba(10, 14, 12, 0.94);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-cats__inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-top: 0.7rem;
  padding-bottom: 0.7rem;
  scrollbar-width: none;
}

.page-faq .faq-cats__inner::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-cats__link {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(18, 70, 62, 0.3), rgba(10, 14, 12, 0));
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-cats__link:hover,
.page-faq .faq-cats__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-faq .faq-cats__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.7rem;
  color: var(--cyan);
  opacity: 0.85;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-main {
  padding-top: clamp(2rem, 4vw, 3.5rem);
  padding-bottom: clamp(3rem, 6vw, 5.5rem);
  background: var(--ink-900);
}

.page-faq .faq-body {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

/* ---------- 左栏索引 ---------- */
.page-faq .faq-index {
  min-width: 0;
}

.page-faq .faq-index__label {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-index__nav {
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: none;
}

.page-faq .faq-index__nav::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-index__link {
  flex: none;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  white-space: nowrap;
  padding: 0.4rem 0.7rem;
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.7rem;
  color: var(--line);
}

/* ---------- 右栏回答 ---------- */
.page-faq .faq-answers {
  min-width: 0;
}

.page-faq .faq-group {
  padding-bottom: clamp(1.75rem, 3.5vw, 3rem);
}

.page-faq .faq-group + .faq-group {
  padding-top: clamp(0.5rem, 1.5vw, 1rem);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding-bottom: 0.8rem;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-group__index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  transition: color var(--dur) var(--ease), text-shadow var(--dur) var(--ease);
}

.page-faq .faq-group__index.is-lit {
  color: var(--cyan);
  text-shadow: 0 0 14px rgba(63, 224, 200, 0.55);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-item {
  position: relative;
  padding: 1.5rem 0 1.75rem;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h, 80px) + 6.5rem);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-item:target {
  background: linear-gradient(90deg, rgba(63, 224, 200, 0.07), rgba(63, 224, 200, 0) 62%);
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin: 0;
  font-size: clamp(1.02rem, 1.6vw, 1.15rem);
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
}

.page-faq .faq-item__num {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .faq-item__lead {
  margin: 0.85rem 0 0;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--text);
}

.page-faq .faq-item__lead a,
.page-faq .notes a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-item__lead a:hover,
.page-faq .notes a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 步骤 ---------- */
.page-faq .steps {
  counter-reset: step;
  list-style: none;
  display: grid;
  gap: 0.7rem;
  margin: 1.1rem 0 0;
  padding: 0;
}

.page-faq .steps > li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 1.6rem minmax(0, 1fr);
  gap: 0.85rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text);
}

.page-faq .steps > li::before {
  content: counter(step, decimal-leading-zero);
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  margin-top: 0.2rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.68rem;
  color: var(--cyan);
  background: rgba(18, 70, 62, 0.45);
  border: 1px solid var(--line);
  border-radius: 2px;
}

/* ---------- 要点列表 ---------- */
.page-faq .notes {
  list-style: none;
  display: grid;
  gap: 0.6rem;
  margin: 1.1rem 0 0;
  padding: 0;
}

.page-faq .notes > li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--text);
}

.page-faq .notes > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 0.55rem;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  position: relative;
  margin: 1.35rem 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-faq .faq-figure::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 60%;
  background: repeating-linear-gradient(180deg, rgba(63, 224, 200, 0.05) 0 1px, rgba(0, 0, 0, 0) 1px 4px);
  pointer-events: none;
}

.page-faq .faq-figure figcaption {
  position: relative;
  z-index: 1;
  padding: 0.7rem 0.9rem;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
  background: var(--ink-900);
}

/* ---------- 图文并排 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: 1.25rem;
}

.page-faq .faq-split .faq-figure {
  margin-top: 0;
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) minmax(170px, 230px);
    gap: 1.75rem;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4.5rem);
  }

  .page-faq .faq-index__inner {
    position: sticky;
    top: var(--faq-sticky-top);
    max-height: calc(100vh - var(--header-h, 80px) - 7rem);
    overflow-y: auto;
    padding-right: 0.75rem;
    scrollbar-width: thin;
  }

  .page-faq .faq-index__nav {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__link {
    display: flex;
    padding: 0.35rem 0 0.35rem 0.75rem;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    white-space: normal;
  }

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

  .page-faq .faq-index__link + .faq-index__link {
    margin-top: 0.15rem;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-cats__link,
  .page-faq .faq-index__link,
  .page-faq .faq-item,
  .page-faq .faq-group__index {
    transition: none;
  }

  .page-faq .faq-cats__link:hover {
    transform: none;
  }
}
<<<END>>>