.page-faq {
  --faq-line: rgba(28, 70, 119, .72);
  --faq-line-lit: rgba(63, 224, 208, .48);
  --faq-glass: rgba(11, 33, 64, .72);
  --faq-halo: rgba(63, 224, 208, .16);
  color: var(--sf-mist);
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-faq .sf-crumbs {
  margin: clamp(14px, 2.6vw, 26px) 0 clamp(10px, 2vw, 18px);
}

/* ---------- 开场 ---------- */
.page-faq .faq-hero {
  position: relative;
  margin-top: clamp(4px, 1.4vw, 12px);
  padding: clamp(22px, 4.4vw, 50px) clamp(18px, 3.4vw, 44px) clamp(20px, 3.2vw, 38px);
  border: 1px solid var(--faq-line);
  border-radius: var(--sf-radius-l);
  background: var(--sf-grad-deep);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -12%;
  width: min(460px, 62%);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(63, 224, 208, .22), rgba(6, 20, 40, 0) 68%);
  pointer-events: none;
}

.page-faq .faq-hero h1 {
  position: relative;
  margin: 10px 0 0;
  max-width: 18ch;
  font-family: var(--sf-font-display);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.14;
  letter-spacing: -.02em;
}

.page-faq .faq-hero .sf-lede {
  position: relative;
  margin: 16px 0 0;
}

.page-faq .faq-hero__facts {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13.5px;
  color: var(--sf-gray);
}

.page-faq .faq-hero__facts li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-faq .faq-hero__facts .sf-mono {
  color: var(--sf-gold-500);
  font-size: 13px;
  letter-spacing: .02em;
}

.page-faq .faq-hero__media {
  position: relative;
  margin: clamp(22px, 3.6vw, 38px) 0 0;
  border-radius: var(--sf-radius-m);
  overflow: hidden;
  border: 1px solid var(--faq-line);
  background: var(--sf-deep-800);
}

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

/* ---------- 主结构 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(28px, 5vw, 60px);
}

/* ---------- 索引 ---------- */
.page-faq .faq-index {
  border: 1px solid var(--faq-line);
  border-radius: var(--sf-radius-m);
  background: var(--faq-glass);
  padding: 14px;
}

.page-faq .faq-index__label {
  margin: 0 0 10px;
  font-family: var(--sf-font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--sf-neon-400);
}

.page-faq .faq-index nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__group {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--faq-line);
  background: rgba(6, 20, 40, .5);
  color: var(--sf-mist);
  font-size: 13.5px;
  font-weight: 700;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color .25s var(--sf-ease), color .25s var(--sf-ease), background-color .25s var(--sf-ease);
}

.page-faq .faq-index__group:hover,
.page-faq .faq-index__group:focus-visible {
  border-color: var(--sf-neon-400);
  color: var(--sf-neon-200);
}

.page-faq .faq-index__sublist {
  display: none;
  margin: 6px 0 0;
  padding: 0 0 0 12px;
  list-style: none;
  border-left: 1px solid var(--faq-line);
}

.page-faq .faq-index__link {
  display: block;
  padding: 5px 8px;
  border-radius: var(--sf-radius-s);
  color: var(--sf-gray);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color .2s var(--sf-ease), background-color .2s var(--sf-ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--sf-mist);
  background: rgba(63, 224, 208, .1);
}

/* ---------- 问题组 ---------- */
.page-faq .faq-answers {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 110px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 12px;
  margin-bottom: 16px;
}

.page-faq .faq-group__num {
  font-size: 13px;
  color: var(--sf-neon-400);
  letter-spacing: .08em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--sf-font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 30px);
  letter-spacing: -.01em;
}

.page-faq .faq-group__desc {
  grid-column: 2;
  margin: 0;
  font-size: 13.5px;
  color: var(--sf-gray);
}

.page-faq .faq-band {
  height: clamp(30px, 5vw, 64px);
  margin: clamp(20px, 3vw, 34px) 0 0;
  background: linear-gradient(180deg, rgba(63, 224, 208, .09), rgba(6, 20, 40, 0));
  border-radius: var(--sf-radius-l);
}

.page-faq .faq-group__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
}

.page-faq .faq-side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-faq .faq-side .sf-media {
  margin: 0;
  border: 1px solid var(--faq-line);
  border-radius: var(--sf-radius-m);
  overflow: hidden;
  background: var(--sf-deep-800);
}

.page-faq .faq-side .sf-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-side__note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--sf-neon-400);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--sf-gray);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border: 1px solid var(--faq-line);
  border-radius: var(--sf-radius-m);
  background: linear-gradient(160deg, rgba(11, 33, 64, .92), rgba(6, 20, 40, .82));
  overflow: hidden;
  scroll-margin-top: 110px;
  transition: border-color .3s var(--sf-ease), box-shadow .3s var(--sf-ease), background-color .3s var(--sf-ease);
}

.page-faq .qa + .qa {
  margin-top: 10px;
}

.page-faq .qa summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--sf-font-display);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--sf-mist);
}

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

.page-faq .qa summary::after {
  content: "";
  flex: 0 0 auto;
  margin-left: auto;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--sf-neon-400);
  border-bottom: 2px solid var(--sf-neon-400);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .3s var(--sf-ease);
}

.page-faq .qa[open] summary::after {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-faq .qa__no {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--sf-neon-400);
  letter-spacing: .06em;
}

.page-faq .qa__q {
  min-width: 0;
}

.page-faq .qa__body {
  padding: 0 18px 18px 44px;
  border-top: 1px solid rgba(28, 70, 119, .5);
  padding-top: 14px;
}

.page-faq .qa__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--sf-mist);
  max-width: 62ch;
}

.page-faq .qa__body .sf-mono {
  color: var(--sf-gold-300);
  font-size: 14.5px;
}

.page-faq .qa[open] {
  border-color: var(--faq-line-lit);
  background: linear-gradient(160deg, rgba(18, 48, 90, .95), rgba(6, 20, 40, .9));
  box-shadow: 0 12px 30px -22px var(--faq-halo);
}

.page-faq .qa:target {
  border-color: var(--sf-gold-500);
  box-shadow: 0 0 0 1px rgba(242, 180, 65, .35);
}

.page-faq .qa[open] .qa__body {
  animation: faqSlide .34s var(--sf-ease) both;
}

@keyframes faqSlide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-faq .faq-group__more {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sf-gray);
}

.page-faq .faq-group__more a {
  color: var(--sf-neon-200);
  text-decoration: underline;
  text-decoration-color: rgba(63, 224, 208, .45);
  text-underline-offset: 3px;
}

/* ---------- 路径图 ---------- */
.page-faq .faq-path {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 14px;
  border: 1px solid var(--faq-line);
  border-radius: var(--sf-radius-m);
  background: rgba(11, 33, 64, .55);
}

.page-faq .faq-path svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 底部行动区 ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(44px, 7vw, 84px);
  padding: clamp(22px, 4vw, 44px);
  border: 1px solid var(--faq-line);
  border-radius: var(--sf-radius-l);
  background: var(--sf-grad-night);
}

.page-faq .faq-cta h2 {
  margin: 0;
  font-family: var(--sf-font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -.01em;
}

.page-faq .faq-cta__text p {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--sf-gray);
  max-width: 60ch;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-faq .sf-save {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid rgba(242, 180, 65, .5);
  background: rgba(242, 180, 65, .1);
  color: var(--sf-gold-300);
  font-family: var(--sf-font-body);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color .25s var(--sf-ease), border-color .25s var(--sf-ease), color .25s var(--sf-ease);
}

.page-faq .sf-save__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sf-gold-500);
  box-shadow: 0 0 0 3px rgba(242, 180, 65, .18);
}

.page-faq .sf-save:hover,
.page-faq .sf-save:focus-visible {
  border-color: var(--sf-gold-500);
  background: rgba(242, 180, 65, .2);
  color: var(--sf-mist);
}

.page-faq .sf-save[aria-pressed="true"] {
  background: rgba(63, 224, 208, .14);
  border-color: var(--sf-neon-400);
  color: var(--sf-neon-200);
}

.page-faq .sf-save[aria-pressed="true"] .sf-save__dot {
  background: var(--sf-neon-400);
  box-shadow: 0 0 0 3px rgba(63, 224, 208, .22);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }

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

  .page-faq .qa summary {
    padding: 17px 22px;
  }

  .page-faq .qa__body {
    padding: 15px 22px 20px 56px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(228px, 264px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 110px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    padding: 18px 16px;
  }

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

  .page-faq .faq-index__item {
    display: block;
    padding-bottom: 12px;
  }

  .page-faq .faq-index__item + .faq-index__item {
    padding-top: 12px;
    border-top: 1px solid rgba(28, 70, 119, .5);
  }

  .page-faq .faq-index__group {
    display: block;
    padding: 0 0 0 10px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    font-family: var(--sf-font-display);
    font-size: 15px;
    transition: color .25s var(--sf-ease), border-color .25s var(--sf-ease);
  }

  .page-faq .faq-index__group:hover,
  .page-faq .faq-index__group:focus-visible {
    border-left-color: var(--sf-neon-400);
    color: var(--sf-neon-200);
    background: none;
  }

  .page-faq .faq-index__sublist {
    display: block;
    margin-top: 8px;
  }

  .page-faq .faq-group__split {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
  }

  .page-faq .faq-side {
    margin-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa summary::after,
  .page-faq .faq-index__group,
  .page-faq .faq-index__link,
  .page-faq .sf-save {
    transition: none;
  }

  .page-faq .qa[open] .qa__body {
    animation: none;
  }
}