.page-faq {
  --faq-fg: var(--paper-100);
  --faq-fg-soft: rgba(242, 237, 227, .68);
  --faq-rule: rgba(242, 237, 227, .18);
  --faq-rule-strong: rgba(52, 240, 206, .5);
  --faq-accent-soft: rgba(52, 240, 206, .1);
  background: var(--ink-900);
  color: var(--paper-100);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}
.page-faq * { box-sizing: border-box; }
.page-faq img { max-width: 100%; height: auto; display: block; }

/* 页头 */
.page-faq .faq-head {
  position: relative;
  padding: clamp(40px, 6vw, 80px) 0 clamp(28px, 4vw, 52px);
  background:
    radial-gradient(1200px 420px at 0% 0%, rgba(44, 90, 75, .55), transparent 62%),
    var(--ink-900);
  overflow: hidden;
}
.page-faq .faq-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(52, 240, 206, .045) 0 1px, transparent 1px 12.5%);
  pointer-events: none;
}
.page-faq .faq-head .breadcrumb {
  position: relative;
  margin-bottom: 24px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gray-450);
  font-family: var(--font-mono);
}
.page-faq .faq-head .breadcrumb a {
  color: var(--paper-100);
  text-decoration: none;
}
.page-faq .faq-head .breadcrumb a:hover { color: var(--cyan-400); }
.page-faq .faq-head .breadcrumb__sep {
  display: inline-block;
  margin: 0 8px;
  color: var(--gray-450);
}
.page-faq .faq-head__grid {
  position: relative;
  display: grid;
  gap: 32px;
}
@media (min-width: 900px) {
  .page-faq .faq-head__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: clamp(40px, 5vw, 72px);
    align-items: end;
  }
}
.page-faq .faq-head__copy .eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  padding-left: 30px;
  position: relative;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--cyan-400);
  text-transform: uppercase;
}
.page-faq .faq-head__copy .eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 22px;
  height: 1px;
  background: var(--cyan-400);
}
.page-faq .faq-head__copy h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.02em;
  margin: 0 0 20px;
  color: var(--paper-100);
}
.page-faq .faq-head__copy h1 em {
  font-style: normal;
  color: var(--cyan-400);
  display: inline-block;
}
.page-faq .faq-lead {
  margin: 0;
  max-width: 40ch;
  color: var(--faq-fg-soft);
  font-size: clamp(15px, 1.4vw, 17px);
}
.page-faq .faq-head__figure {
  margin: 0;
}
.page-faq .faq-head__figure .figure__frame {
  border: 1px solid rgba(242, 237, 227, .16);
  background: var(--ink-850);
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.page-faq .faq-head__figure .figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.62) contrast(1.02) brightness(.88);
}
.page-faq .faq-head__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gray-450);
}

/* 顶部索引带 */
.page-faq .faq-index {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--ink-850);
  border-top: 1px solid rgba(242, 237, 227, .08);
  border-bottom: 1px solid rgba(242, 237, 227, .08);
  backdrop-filter: saturate(.7);
}
.page-faq .faq-index .container {
  padding-top: 14px;
  padding-bottom: 14px;
}
.page-faq .faq-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 4px;
}
.page-faq .faq-tabs::-webkit-scrollbar { display: none; }
.page-faq .faq-tabs__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid rgba(242, 237, 227, .18);
  border-radius: 2px;
  color: var(--paper-100);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  font-family: var(--font-body);
  transition: background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}
.page-faq .faq-tabs__item:hover {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}
.page-faq .faq-tabs__item[data-active] {
  background: var(--cyan-400);
  color: var(--ink-900);
  border-color: var(--cyan-400);
}
.page-faq .faq-tabs__count {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--gray-450);
}
.page-faq .faq-tabs__item[data-active] .faq-tabs__count {
  color: rgba(10, 30, 24, .72);
}

/* 分组 */
.page-faq .faq-group {
  padding: clamp(48px, 7vw, 88px) 0;
  position: relative;
  scroll-margin-top: 80px;
}
.page-faq .faq-group--paper {
  --faq-fg: var(--ink-900);
  --faq-fg-soft: rgba(10, 30, 24, .68);
  --faq-rule: rgba(10, 30, 24, .16);
  --faq-rule-strong: rgba(10, 30, 24, .4);
  --faq-accent-soft: rgba(52, 240, 206, .12);
  background: var(--paper-100);
  color: var(--ink-900);
}
.page-faq .faq-group--dark {
  --faq-fg: var(--paper-100);
  --faq-fg-soft: rgba(242, 237, 227, .68);
  --faq-rule: rgba(242, 237, 227, .18);
  --faq-rule-strong: rgba(52, 240, 206, .5);
  --faq-accent-soft: rgba(52, 240, 206, .1);
  background: var(--ink-700);
  color: var(--paper-100);
}
.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  align-items: baseline;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--faq-rule-strong);
}
.page-faq .faq-group__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange-500);
  letter-spacing: .04em;
}
.page-faq .faq-group__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 900;
  line-height: 1.1;
  margin: 0;
  letter-spacing: -.01em;
  color: var(--faq-fg);
}
.page-faq .faq-group__desc {
  grid-column: 2 / -1;
  margin: 0;
  max-width: 54ch;
  color: var(--faq-fg-soft);
  font-size: 14px;
  line-height: 1.7;
}

/* 问答折叠组 */
.page-faq .faq-group__list {
  display: grid;
  gap: 0;
}
.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-rule);
  position: relative;
  transition: background .2s var(--ease);
}
.page-faq .faq-item:first-child {
  border-top: 1px solid var(--faq-rule);
}
.page-faq .faq-item[open] {
  background: var(--faq-accent-soft);
}
.page-faq .faq-q {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 20px 20px 20px 26px;
  position: relative;
  color: var(--faq-fg);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.005em;
}
.page-faq .faq-q::-webkit-details-marker { display: none; }
.page-faq .faq-q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: var(--faq-rule);
  transition: background .2s var(--ease), top .2s var(--ease), bottom .2s var(--ease);
}
.page-faq .faq-item[open] .faq-q::before {
  background: var(--cyan-400);
  top: 6px;
  bottom: 6px;
}
.page-faq .faq-q:hover .faq-q__text {
  color: var(--cyan-400);
}
.page-faq .faq-q__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--gray-450);
  line-height: 1;
}
.page-faq .faq-q__text {
  padding-right: 12px;
  transition: color .18s var(--ease);
}
.page-faq .faq-q__mark {
  position: relative;
  width: 20px;
  height: 20px;
  border: 1px solid currentColor;
  border-radius: 50%;
  flex-shrink: 0;
  color: var(--faq-fg-soft);
  transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform .22s var(--ease);
}
.page-faq .faq-q__mark::before {
  left: 5px;
  right: 5px;
  top: 50%;
  height: 1px;
  margin-top: -.5px;
}
.page-faq .faq-q__mark::after {
  top: 5px;
  bottom: 5px;
  left: 50%;
  width: 1px;
  margin-left: -.5px;
}
.page-faq .faq-item[open] .faq-q__mark {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-900);
}
.page-faq .faq-item[open] .faq-q__mark::after {
  transform: scaleY(0);
}

/* 答案区 */
.page-faq .faq-a {
  padding: 0 20px 24px 26px;
  color: var(--faq-fg-soft);
  font-size: 15px;
  line-height: 1.75;
  animation: faq-fade .22s var(--ease);
}
@keyframes faq-fade {
  from { opacity: 0; transform: translateY(-3px); }
  to { opacity: 1; transform: translateY(0); }
}
.page-faq .faq-a > p:first-child { margin-top: 0; }
.page-faq .faq-a__hint {
  margin-top: 14px;
  padding: 10px 14px;
  border-left: 2px solid var(--orange-500);
  background: rgba(255, 106, 43, .08);
  font-size: 13px;
  color: var(--faq-fg-soft);
  line-height: 1.7;
}
.page-faq .faq-group--paper .faq-a__hint {
  background: rgba(255, 106, 43, .1);
}
.page-faq .faq-steps {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  align-items: start;
  padding: 12px 0;
  border-top: 1px dashed var(--faq-rule);
  color: var(--faq-fg);
}
.page-faq .faq-steps li:last-child {
  border-bottom: 1px dashed var(--faq-rule);
}
.page-faq .faq-steps__no {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
  letter-spacing: .02em;
}
.page-faq .faq-group--paper .faq-steps__no {
  color: var(--ink-700);
}
.page-faq .faq-a__foot {
  margin-top: 16px;
  display: flex;
  justify-content: flex-end;
}
.page-faq .faq-nope {
  appearance: none;
  border: 1px solid var(--faq-rule);
  background: transparent;
  color: var(--faq-fg-soft);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 6px 12px;
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.page-faq .faq-nope:hover {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
}
.page-faq .faq-group--paper .faq-nope:hover {
  color: var(--ink-700);
  border-color: var(--ink-700);
  background: rgba(52, 240, 206, .16);
}

/* 下载组顶部图 */
.page-faq .faq-group__figure {
  margin: 0 0 32px;
  max-width: 760px;
}
.page-faq .faq-group__figure .figure__frame {
  border: 1px solid var(--faq-rule);
  background: rgba(10, 30, 24, .05);
  aspect-ratio: 10 / 7;
  overflow: hidden;
}
.page-faq .faq-group--dark .faq-group__figure .figure__frame {
  background: rgba(242, 237, 227, .04);
}
.page-faq .faq-group__figure .figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.62);
}
.page-faq .faq-group__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gray-450);
  line-height: 1.6;
}

/* 底部提示带 */
.page-faq .faq-help-strip {
  position: relative;
  background: var(--ink-850);
  color: var(--paper-100);
  padding: clamp(40px, 5vw, 64px) 0;
  border-top: 1px solid rgba(255, 106, 43, .5);
  overflow: hidden;
}
.page-faq .faq-help-strip::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255, 106, 43, .16), transparent 45%);
  pointer-events: none;
}
.page-faq .faq-help-strip .container {
  position: relative;
}
.page-faq .faq-help-strip__inner {
  display: grid;
  gap: 24px;
}
@media (min-width: 900px) {
  .page-faq .faq-help-strip__inner {
    grid-template-columns: 1.4fr 1fr;
    gap: 56px;
    align-items: end;
  }
}
.page-faq .faq-help-strip h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.015em;
  margin: 0 0 12px;
  color: var(--paper-100);
}
.page-faq .faq-help-strip p {
  margin: 0;
  max-width: 52ch;
  color: rgba(242, 237, 227, .72);
  font-size: 14px;
  line-height: 1.7;
}
.page-faq .faq-help-strip p a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-faq .faq-help-strip__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-faq .faq-mail {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--cyan-400);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  border-radius: 2px;
  text-decoration: none;
  overflow-wrap: anywhere;
  transition: background .18s var(--ease), color .18s var(--ease);
}
.page-faq .faq-mail:hover {
  background: var(--paper-100);
  color: var(--ink-900);
}
.page-faq .faq-help-strip .btn--ghost {
  align-self: center;
  border: 1px solid rgba(242, 237, 227, .28);
  color: var(--paper-100);
  text-decoration: none;
  padding: 12px 18px;
  font-size: 14px;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.page-faq .faq-help-strip .btn--ghost:hover {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}

@media (max-width: 640px) {
  .page-faq .faq-head__copy h1 {
    font-size: clamp(28px, 8.4vw, 40px);
    line-height: 1.08;
  }
  .page-faq .faq-group__head {
    grid-template-columns: auto 1fr;
    gap: 6px 12px;
  }
  .page-faq .faq-group__desc {
    grid-column: 1 / -1;
    margin-top: 4px;
  }
  .page-faq .faq-q {
    padding: 16px 14px 16px 22px;
    font-size: 15px;
    gap: 12px;
  }
  .page-faq .faq-q__no {
    display: none;
  }
  .page-faq .faq-a {
    padding: 0 14px 20px 22px;
    font-size: 14px;
  }
  .page-faq .faq-steps li {
    grid-template-columns: 26px 1fr;
    gap: 10px;
  }
  .page-faq .faq-steps__no {
    font-size: 17px;
  }
  .page-faq .faq-help-strip__actions {
    flex-direction: column;
    align-items: flex-start;
  }
  .page-faq .faq-mail,
  .page-faq .faq-help-strip .btn--ghost {
    width: 100%;
    justify-content: center;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-a {
    animation: none;
  }
  .page-faq .faq-q__mark::after,
  .page-faq .faq-q::before,
  .page-faq .faq-item,
  .page-faq .faq-q__text {
    transition: none;
  }
}
<<<END>>>