.page-faq {
  --faq-rail-w: 15rem;
  --faq-card: linear-gradient(158deg, rgba(21, 29, 69, .9) 0%, rgba(14, 20, 48, .88) 100%);
  --faq-gap: clamp(1.5rem, 4vw, 3rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--c-line-soft);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 68% at 16% 0%, rgba(138, 92, 255, .22), transparent 66%),
    radial-gradient(46% 56% at 94% 18%, rgba(41, 240, 222, .15), transparent 70%);
  pointer-events: none;
}
.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--faq-gap);
  padding-block: clamp(2.25rem, 6vw, 4.25rem);
}

.page-faq .faq-hero h1 {
  margin: .7rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--c-ink);
  max-width: 22ch;
}
.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 42ch;
  color: var(--c-muted);
  font-size: 1.02rem;
  line-height: 1.8;
}
.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}
.page-faq .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

/* ---------- 分类速览面板 ---------- */
.page-faq .faq-panel {
  position: relative;
  overflow: hidden;
  padding: 1.25rem 1.25rem 1rem;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: var(--faq-card);
  box-shadow: var(--shadow-card);
}
.page-faq .faq-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, var(--c-line-soft) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, var(--c-line-soft) 0 1px, transparent 1px 44px);
  opacity: .45;
  pointer-events: none;
}
.page-faq .faq-panel > * {
  position: relative;
  z-index: 1;
}
.page-faq .faq-panel__cap {
  margin: 0 0 .6rem;
  color: var(--c-muted);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.page-faq .faq-panel__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-panel__list a {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  align-items: center;
  gap: .6rem;
  padding: .7rem .15rem;
  border-bottom: 1px solid var(--c-line-soft);
  color: var(--c-ink);
  text-decoration: none;
  font-size: .95rem;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.page-faq .faq-panel__list a:hover,
.page-faq .faq-panel__list a:focus-visible {
  color: var(--c-cyan);
  padding-left: .45rem;
}
.page-faq .faq-panel__no {
  color: var(--c-cyan);
  font-size: .72rem;
}
.page-faq .faq-panel__n {
  color: var(--c-muted);
  font-size: .68rem;
  letter-spacing: .06em;
}
.page-faq .faq-panel__foot {
  margin: 1rem 0 0;
  color: var(--c-muted);
  font-size: .68rem;
  letter-spacing: .08em;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(3rem, 7vw, 5.5rem);
}
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
}
.page-faq .faq-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  margin: 0;
  padding: .25rem 0;
  background: rgba(6, 10, 28, .93);
  border-bottom: 1px solid var(--c-line);
}
.page-faq .faq-rail__list {
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: .5rem 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-faq .faq-rail__list::-webkit-scrollbar {
  display: none;
}
.page-faq .faq-rail__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .42rem .75rem;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-muted);
  font-size: .82rem;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-faq .faq-rail__link .mono {
  font-size: .66rem;
  letter-spacing: .08em;
  opacity: .85;
}
.page-faq .faq-rail__link:hover {
  color: var(--c-ink);
  border-color: var(--c-violet);
}
.page-faq .faq-rail__link.is-active {
  color: var(--c-void);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  box-shadow: var(--glow-cyan);
}

/* ---------- 章节头部 ---------- */
.page-faq .faq-block {
  padding-block: clamp(1.5rem, 4vw, 2.25rem);
  border-top: 1px solid var(--c-line-soft);
}
.page-faq .faq-block:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-faq .faq-head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: .35rem .75rem;
  margin-bottom: 1.25rem;
}
.page-faq .faq-head__no {
  color: var(--c-cyan);
  font-size: .74rem;
  letter-spacing: .14em;
}
.page-faq .faq-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-ink);
}
.page-faq .faq-head__note {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--c-muted);
  font-size: .8rem;
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-list {
  min-width: 0;
}
.page-faq .faq-item {
  position: relative;
  border-top: 1px solid var(--c-line-soft);
}
.page-faq .faq-item:last-child {
  border-bottom: 1px solid var(--c-line-soft);
}
.page-faq .faq-item--warn {
  padding-left: .8rem;
}
.page-faq .faq-item--warn::before {
  content: "";
  position: absolute;
  left: 0;
  top: .85rem;
  bottom: .85rem;
  width: 2px;
  border-radius: 2px;
  background: var(--c-warn);
  box-shadow: 0 0 12px -2px rgba(255, 138, 60, .85);
}
.page-faq .faq-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .55rem .7rem;
  padding: 1rem .2rem;
  cursor: pointer;
  list-style: none;
}
.page-faq .faq-item summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item summary:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 2px;
}
.page-faq .faq-no {
  color: var(--c-muted);
  font-size: .7rem;
  letter-spacing: .1em;
}
.page-faq .faq-q {
  flex: 1 1 12rem;
  min-width: 0;
  color: var(--c-ink);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.6;
  background-image: linear-gradient(var(--c-cyan), var(--c-cyan));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 1px;
  transition: background-size .26s var(--ease), color var(--dur) var(--ease);
}
.page-faq .faq-item summary:hover .faq-q {
  background-size: 100% 1px;
  color: var(--c-glow);
}
.page-faq .faq-chev {
  margin-left: auto;
  align-self: center;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--c-muted);
  border-bottom: 1.5px solid var(--c-muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .faq-item[open] .faq-chev {
  transform: rotate(225deg) translate(-1px, -1px);
  border-color: var(--c-cyan);
}

.page-faq .faq-a {
  padding: .1rem .2rem 1.1rem 1.4rem;
  color: var(--c-muted);
  font-size: .93rem;
  line-height: 1.8;
  max-width: 58ch;
}
.page-faq .faq-a p {
  margin: 0 0 .6rem;
}
.page-faq .faq-a strong {
  color: var(--c-ink);
  font-weight: 600;
}
.page-faq .faq-a a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-faq .faq-inline-link {
  margin: .3rem 0 .5rem;
  font-size: .88rem;
}
.page-faq .faq-steps {
  margin: .5rem 0 .6rem;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}
.page-faq .faq-steps li {
  position: relative;
  counter-increment: faqstep;
  margin-bottom: .5rem;
  padding-left: 2rem;
}
.page-faq .faq-steps li:last-child {
  margin-bottom: 0;
}
.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .18em;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--c-cyan);
  letter-spacing: .06em;
}
.page-faq .faq-meta {
  display: inline-flex;
  align-items: center;
  margin-top: .6rem;
  padding: .22rem .6rem;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-muted);
  font-size: .66rem;
  letter-spacing: .08em;
}

/* ---------- 图文分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}
.page-faq .faq-figure {
  margin: 0;
}
.page-faq .faq-figure .media-frame {
  display: block;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: var(--c-panel);
  box-shadow: var(--shadow-card);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-figure figcaption {
  margin-top: .7rem;
  color: var(--c-muted);
  font-size: .74rem;
  line-height: 1.65;
}

/* ---------- 联系收尾 ---------- */
.page-faq .faq-help {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 3.5vw, 2rem);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: var(--faq-card);
  box-shadow: var(--shadow-card);
}
.page-faq .faq-help::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(70% 90% at 88% 0%, rgba(41, 240, 222, .16), transparent 70%);
  pointer-events: none;
}
.page-faq .faq-help > * {
  position: relative;
  z-index: 1;
}
.page-faq .faq-help__lede {
  margin: 0 0 1.25rem;
  max-width: 52ch;
  color: var(--c-muted);
  font-size: .95rem;
  line-height: 1.8;
}
.page-faq .faq-help__grid {
  display: grid;
  gap: .6rem;
}
.page-faq .faq-help .copy-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: .7rem .9rem;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: rgba(6, 10, 28, .6);
  color: var(--c-glow);
  font-size: .9rem;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-faq .faq-help .copy-line:hover {
  border-color: var(--c-cyan);
  transform: translateY(-1px);
}
.page-faq .faq-help .copy-line .copy-hint {
  flex: 0 0 auto;
  color: var(--c-muted);
  font-family: var(--font-sans);
  font-size: .68rem;
  letter-spacing: .08em;
}
.page-faq .faq-help__foot {
  margin: 1.25rem 0 0;
  color: var(--c-muted);
  font-size: .82rem;
  line-height: 1.7;
}
.page-faq .faq-help__foot a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-head {
    grid-template-columns: auto auto 1fr;
  }
  .page-faq .faq-head__note {
    grid-column: 3;
    text-align: right;
  }
  .page-faq .faq-help__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 18rem;
    align-items: start;
  }
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: end;
  }
  .page-faq .faq-a {
    padding-left: 2.4rem;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 6.5rem;
    padding: 0 0 0 1rem;
    background: none;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
  }
  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: .1rem;
    padding: 0;
    overflow: visible;
  }
  .page-faq .faq-rail__link {
    border: 0;
    border-radius: 0;
    padding: .5rem 0;
    font-size: .86rem;
  }
  .page-faq .faq-rail__link::before {
    content: "";
    position: absolute;
    left: -1.07rem;
    top: 50%;
    width: 2px;
    height: 0;
    background: var(--c-cyan);
    box-shadow: var(--glow-cyan);
    transform: translateY(-50%);
    transition: height var(--dur) var(--ease);
  }
  .page-faq .faq-rail__link.is-active {
    color: var(--c-cyan);
    background: none;
    box-shadow: none;
  }
  .page-faq .faq-rail__link.is-active::before {
    height: 1.1rem;
  }
  .page-faq .faq-rail__link:hover {
    color: var(--c-glow);
    border-color: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q,
  .page-faq .faq-chev,
  .page-faq .faq-rail__link,
  .page-faq .faq-rail__link::before,
  .page-faq .faq-panel__list a,
  .page-faq .faq-help .copy-line {
    transition: none;
  }
}
<<<END>>>