/* ===== 使用指南页 / page-faq ===== */
.page-faq {
  --faq-index-w: 236px;
  --faq-rule: rgba(30, 91, 60, .42);
  display: block;
  background: var(--sf-deep);
  color: var(--sf-chalk);
  font-family: var(--sf-font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--sf-header-h) + 36px) 0 60px;
  background:
    radial-gradient(110% 80% at 88% 2%, rgba(200, 255, 77, .10), transparent 58%),
    radial-gradient(90% 70% at 2% 100%, rgba(255, 122, 24, .08), transparent 62%),
    linear-gradient(180deg, var(--sf-night) 0%, var(--sf-deep) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--sf-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--sf-grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .6;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 32%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 32%, transparent 100%);
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-faq .faq-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--sf-silver);
}

.page-faq .faq-crumb a {
  color: var(--sf-silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--sf-glow);
  border-bottom-color: var(--sf-glow);
}

.page-faq .faq-crumb span[aria-current="page"] {
  color: var(--sf-chalk);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sf-glow);
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  color: var(--sf-chalk);
  max-width: 15em;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 40em;
  color: var(--sf-silver);
  font-size: 16px;
  line-height: 1.8;
}

.page-faq .faq-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.page-faq .faq-hero__num {
  font-size: 30px;
  line-height: 1;
  color: var(--sf-glow);
}

.page-faq .faq-hero__label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sf-silver);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--sf-line);
  border-radius: var(--sf-radius);
  overflow: hidden;
  background: var(--sf-pitch);
}

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

.page-faq .faq-hero__caption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 5px 10px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sf-silver);
  background: rgba(6, 20, 16, .76);
  border-left: 2px solid var(--sf-glow);
}

/* ---------- 三步上手 ---------- */
.page-faq .faq-steps {
  padding: 58px 0 12px;
  background: var(--sf-deep);
}

.page-faq .faq-steps__head {
  margin-bottom: 30px;
}

.page-faq .faq-steps__head .sf-eyebrow {
  margin: 0 0 10px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sf-amber);
}

.page-faq .faq-steps__title {
  margin: 0;
  color: var(--sf-chalk);
}

.page-faq .faq-steps__rail {
  display: none;
}

.page-faq .faq-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-faq .faq-steps__no {
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sf-glow);
}

.page-faq .faq-steps__item h3 {
  margin: 10px 0 8px;
  font-family: var(--sf-font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--sf-chalk);
}

.page-faq .faq-steps__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--sf-silver);
}

/* ---------- 主体：索引 + 问答 ---------- */
.page-faq .faq-body {
  padding: 70px 0 88px;
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(30, 91, 60, .38), transparent 62%),
    linear-gradient(180deg, var(--sf-deep) 0%, var(--sf-night) 100%);
}

.page-faq .faq-body__grid {
  display: grid;
  gap: 40px;
}

.page-faq .faq-index {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-faq .faq-index__head {
  margin: 0;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sf-silver);
}

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

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 12px;
  border-left: 2px solid var(--sf-mute);
  color: var(--sf-silver);
  font-size: 15px;
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--sf-chalk);
  border-left-color: var(--sf-glow);
  background: rgba(200, 255, 77, .05);
}

.page-faq .faq-index__no {
  font-family: var(--sf-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--sf-mute);
}

.page-faq .faq-index__link:hover .faq-index__no {
  color: var(--sf-glow);
}

.page-faq .faq-index__note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--faq-rule);
  font-size: 13px;
  line-height: 1.7;
  color: var(--sf-silver);
}

.page-faq .faq-index__btn {
  align-self: flex-start;
}

.page-faq .faq-flow__title {
  margin: 0 0 22px;
  color: var(--sf-chalk);
}

/* ---------- 筛选栏 ---------- */
.page-faq .faq-filterbar {
  margin-bottom: 40px;
}

.page-faq .faq-filterbar__group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .sf-filter {
  padding: 8px 14px;
  border: 1px solid var(--sf-line);
  border-radius: var(--sf-radius);
  background: transparent;
  color: var(--sf-silver);
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  line-height: 1.4;
  cursor: pointer;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}

.page-faq .sf-filter:hover {
  color: var(--sf-chalk);
  border-color: var(--sf-glow);
}

.page-faq .sf-filter:focus-visible {
  outline: 2px solid var(--sf-glow);
  outline-offset: 2px;
}

.page-faq .sf-filter[aria-pressed="true"] {
  color: var(--sf-night);
  background: var(--sf-glow);
  border-color: var(--sf-glow);
}

.page-faq [data-filter-item][hidden] {
  display: none !important;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  margin-bottom: 68px;
}

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

.page-faq .faq-group__head {
  padding-bottom: 20px;
}

.page-faq .faq-group__no {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sf-glow);
}

.page-faq .faq-group__no::before {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--sf-glow);
}

.page-faq .faq-group__title {
  margin: 0 0 12px;
  font-family: var(--sf-font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--sf-chalk);
}

.page-faq .faq-group__intro {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sf-silver);
}

.page-faq .faq-group__list {
  border-top: 1px solid var(--faq-rule);
}

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

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) 14px;
  column-gap: 12px;
  align-items: center;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--sf-glow);
  outline-offset: 3px;
}

.page-faq .faq-item__no {
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sf-mute);
}

.page-faq .faq-item__text {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--sf-chalk);
  transition: color .18s ease;
}

.page-faq .faq-item__q:hover .faq-item__text,
.page-faq .faq-item[open] .faq-item__text {
  color: var(--sf-glow);
}

.page-faq .faq-item__mark {
  position: relative;
  width: 14px;
  height: 14px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--sf-glow);
  transition: transform .18s ease;
}

.page-faq .faq-item__mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-faq .faq-item__mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .faq-item__a {
  padding: 0 0 22px 42px;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sf-silver);
}

.page-faq .faq-item__a a {
  color: var(--sf-glow);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 77, .4);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-item__a a:focus-visible {
  border-bottom-color: var(--sf-glow);
}

/* ---------- 提醒分组的插图 ---------- */
.page-faq .faq-alert__media {
  position: relative;
  margin: 0 0 26px;
  max-width: 340px;
  border: 1px solid var(--sf-line);
  border-radius: var(--sf-radius);
  overflow: hidden;
  background: var(--sf-pitch);
}

.page-faq .faq-alert__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 10;
  object-fit: cover;
}

.page-faq .faq-alert__media figcaption {
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--sf-silver);
  border-top: 1px solid var(--sf-line);
  background: rgba(6, 20, 16, .6);
}

/* ---------- 结尾渠道 ---------- */
.page-faq .faq-help {
  padding: 64px 0 72px;
  background: var(--sf-pitch);
  border-top: 1px solid var(--sf-line);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: 26px;
}

.page-faq .faq-help__text .sf-eyebrow {
  margin: 0 0 10px;
  font-family: var(--sf-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sf-amber);
}

.page-faq .faq-help__title {
  margin: 0 0 14px;
  color: var(--sf-chalk);
}

.page-faq .faq-help__text p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sf-silver);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-steps__rail {
    display: block;
    color: var(--sf-line);
    margin-bottom: -8px;
  }

  .page-faq .faq-steps__rail svg {
    display: block;
    width: 100%;
    height: 18px;
  }

  .page-faq .faq-steps__rail line {
    stroke: var(--sf-line);
  }

  .page-faq .faq-steps__rail circle {
    fill: var(--sf-glow);
  }

  .page-faq .faq-steps__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
    margin-top: 24px;
  }

  .page-faq .faq-item__q {
    grid-template-columns: 40px minmax(0, 1fr) 14px;
    column-gap: 16px;
    padding: 20px 0;
  }

  .page-faq .faq-item__text {
    font-size: 18px;
  }

  .page-faq .faq-item__a {
    padding: 0 40px 24px 56px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: calc(var(--sf-header-h) + 52px) 0 76px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    grid-template-areas:
      "crumb  media"
      "intro  media";
    column-gap: 52px;
    row-gap: 26px;
    align-items: start;
  }

  .page-faq .faq-crumb {
    grid-area: crumb;
  }

  .page-faq .faq-hero__intro {
    grid-area: intro;
  }

  .page-faq .faq-hero__media {
    grid-area: media;
    aspect-ratio: 4 / 3;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .9fr);
    align-items: center;
    gap: 40px;
  }

  .page-faq .faq-help__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    column-gap: 60px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--sf-header-h-compact) + 22px);
  }

  .page-faq .faq-group {
    margin-bottom: 80px;
  }

  .page-faq .faq-group__title {
    font-size: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-item__text,
  .page-faq .faq-index__link,
  .page-faq .sf-filter,
  .page-faq .faq-crumb a {
    transition: none;
  }
}
<<<END>>>