.page-faq {
  --faq-rail: 250px;
  --faq-gap: clamp(22px, 3.4vw, 56px);
  --faq-sticky: 96px;
}

.page-faq .breadcrumbs {
  padding-block: 18px 2px;
}

/* 首屏 */
.page-faq .faq-hero {
  padding-block: clamp(26px, 4.5vw, 58px) clamp(34px, 6vw, 78px);
  border-bottom: var(--line);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 54px);
}

.page-faq .faq-hero__main h1.display--hero {
  font-size: clamp(40px, 7vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin: 16px 0 0;
  max-width: 20ch;
}

.page-faq .faq-hero__main .lede {
  margin-top: 20px;
  max-width: 54ch;
  color: var(--fog);
}

.page-faq .faq-hero__meta {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-faq .faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__media {
  margin: 0;
  align-self: end;
}

.page-faq .faq-hero__media .media-frame__image {
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
}

/* 主体两栏 */
.page-faq .faq-body {
  padding-block: clamp(30px, 5vw, 72px);
}

.page-faq .faq-body__grid {
  display: grid;
  gap: var(--faq-gap);
}

/* 分类索引 */
.page-faq .faq-index {
  border-top: 2px solid var(--lime);
  padding-top: 14px;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  counter-reset: none;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 10px 11px 12px;
  border-left: 2px solid var(--grid);
  color: var(--fog);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.4;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-index__link .numeric {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--lime);
  background: var(--lime-wash);
  color: var(--lime-soft);
  outline: none;
}

.page-faq .faq-index__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--grid);
  font-size: var(--text-caption);
  line-height: 1.7;
  color: var(--steel);
}

/* 问答组 */
.page-faq .faq-group {
  scroll-margin-top: var(--faq-sticky);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 5vw, 68px);
}

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

.page-faq .faq-group__no {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
  flex: none;
}

.page-faq .faq-group__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 3vw, 36px);
  line-height: 1.1;
  color: var(--fog);
  margin: 0;
}

.page-faq .faq-group__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--steel);
  max-width: 58ch;
}

/* 展开项 */
.page-faq .faq-item {
  border-bottom: 1px solid var(--grid);
}

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

.page-faq .faq-item__trigger {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 2px;
  background: none;
  border: 0;
  color: var(--fog);
  text-align: left;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.4vw, 17px);
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item__trigger:hover,
.page-faq .faq-item__trigger:focus-visible {
  color: var(--lime-soft);
  outline: none;
}

.page-faq .faq-item__dot {
  flex: none;
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border: 1px solid var(--steel);
  border-radius: 50%;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-item__trigger[aria-expanded="true"] .faq-item__dot {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px var(--lime-wash);
}

.page-faq .faq-item__content {
  padding: 0 2px 18px;
  max-width: 68ch;
  font-size: var(--text-body);
  line-height: 1.75;
  color: var(--steel);
}

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

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

.page-faq .faq-item__content a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__content a:hover {
  color: var(--lime-soft);
}

/* 设备示意图 */
.page-faq .faq-devices__figure {
  margin: 22px 0 6px;
}

.page-faq .faq-devices__figure .media-frame__image {
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
}

/* 联系支持 */
.page-faq .faq-contact__grid {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.page-faq .faq-contact__item {
  border-top: 1px solid var(--amber);
  padding-top: 12px;
}

.page-faq .faq-contact__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-faq .faq-contact__value {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--fog);
  word-break: break-word;
}

.page-faq .faq-contact__desc {
  margin: 8px 0 0;
  font-size: var(--text-caption);
  line-height: 1.7;
  color: var(--steel);
}

.page-faq .faq-prep {
  margin-top: clamp(26px, 4vw, 44px);
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--grid);
  background: rgba(10, 30, 51, 0.55);
}

.page-faq .faq-prep__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 24px);
  color: var(--fog);
}

.page-faq .faq-prep__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .faq-prep__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--steel);
}

.page-faq .faq-prep__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--lime);
}

.page-faq .faq-prep__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* 平板及以上 */
@media (min-width: 760px) {
  .page-faq .faq-contact__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-faq .faq-prep__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 28px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky);
    align-self: start;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__main h1.display--hero {
    font-size: clamp(64px, 6.4vw, 104px);
  }
}
<<<END>>>