.page-faq {
  --faq-sticky: 120px;
  position: relative;
  overflow-x: clip;
  padding-bottom: clamp(64px, 8vw, 120px);
}

.page-faq::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: min(780px, 92vh);
  background-image:
    radial-gradient(880px 420px at 80% 4%, rgba(124, 77, 255, .18), transparent 70%),
    radial-gradient(660px 360px at 4% 0%, rgba(0, 229, 255, .15), transparent 72%),
    linear-gradient(rgba(42, 58, 82, .22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 58, 82, .22) 1px, transparent 1px);
  background-size: auto, auto, 64px 64px, 64px 64px;
  pointer-events: none;
  z-index: 0;
}

.page-faq > * {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-top: clamp(26px, 5vw, 56px);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
}

.page-faq .faq-hero__copy .eyebrow {
  display: inline-block;
  margin-bottom: 14px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 3.85rem);
  line-height: 1.06;
  letter-spacing: .01em;
  color: var(--c-text);
  margin: 0 0 18px;
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  max-width: 620px;
  margin: 0 0 24px;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
  color: var(--c-text-soft);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 32px;
  margin: 0;
  padding: 16px 0 0;
  border-top: 2px solid var(--c-line);
  list-style: none;
}

.page-faq .faq-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 96px;
}

.page-faq .faq-hero__facts b {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--c-cyan);
  text-shadow: var(--glow-cyan);
}

.page-faq .faq-hero__facts span {
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--c-muted);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  transform: rotate(-1deg);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 主体三栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(40px, 6vw, 80px);
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index__title,
.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--c-muted);
  text-transform: uppercase;
}

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

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-left: 2px solid var(--c-line);
  color: var(--c-text-soft);
  text-decoration: none;
  font-size: .95rem;
  line-height: 1.5;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-index__list .mono {
  flex: 0 0 auto;
  font-size: .74rem;
  color: var(--c-cyan);
  letter-spacing: .06em;
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  border-left-color: var(--c-cyan);
  background: rgba(0, 229, 255, .08);
  color: var(--c-text);
  transform: translateX(3px);
}

/* ---------- 筛选条 ---------- */
.page-faq .faq-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 14px 16px;
  margin-bottom: clamp(24px, 3vw, 36px);
  border: var(--bd);
  border-radius: 2px;
  background: var(--c-panel);
}

.page-faq .faq-filters__label {
  margin: 0;
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--c-muted);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(28px, 4vw, 46px);
  scroll-margin-top: var(--faq-sticky);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--c-line);
}

.page-faq .faq-group__no {
  font-size: .82rem;
  letter-spacing: .12em;
  color: var(--c-orange);
}

.page-faq .faq-group__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--c-text);
}

.page-faq .faq-group__note {
  margin: 0 0 16px;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-item {
  margin-bottom: 10px;
  border: var(--bd);
  border-radius: 2px;
  background: var(--c-card);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(0, 229, 255, .55);
}

.page-faq .faq-item[open] {
  border-color: var(--c-cyan);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-text);
}

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

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--c-cyan);
}

.page-faq .faq-item__q {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  margin-left: auto;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--c-cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-item__icon::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__body {
  padding: 14px 16px 18px;
  border-top: 1px solid rgba(42, 58, 82, .85);
}

.page-faq .faq-item[open] .faq-item__body {
  animation: faq-body-in 220ms var(--ease);
}

@keyframes faq-body-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
  font-size: .97rem;
  line-height: 1.8;
  color: var(--c-text-soft);
}

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

.page-faq .faq-item__body a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .faq-item__body a:hover,
.page-faq .faq-item__body a:focus-visible {
  color: var(--c-text);
  text-decoration-color: var(--c-orange);
}

/* ---------- 中部插图 ---------- */
.page-faq .faq-figure {
  margin: clamp(24px, 4vw, 42px) 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 右侧粘性面板 ---------- */
.page-faq .faq-rail {
  align-self: start;
  padding: 18px;
  border: var(--bd);
  border-radius: 2px;
  background: var(--c-panel);
}

.page-faq .faq-rail__link {
  display: block;
  padding: 12px 0 12px 12px;
  border-bottom: 1px solid rgba(42, 58, 82, .85);
  border-left: 2px solid transparent;
  color: var(--c-text);
  font-size: .95rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    padding-left var(--dur) var(--ease);
}

.page-faq .faq-rail__link span {
  display: block;
  margin-top: 3px;
  font-size: .72rem;
  font-weight: 400;
  letter-spacing: .02em;
  color: var(--c-muted);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-left-color: var(--c-cyan);
  color: var(--c-cyan);
  padding-left: 16px;
}

.page-faq .faq-rail__note {
  margin-top: 18px;
  padding: 12px 14px;
  border-left: 2px solid var(--c-orange);
  background: rgba(255, 107, 26, .09);
}

.page-faq .faq-rail__note p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--c-text-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-item > summary {
    padding: 17px 20px;
  }

  .page-faq .faq-item__body {
    padding: 15px 20px 20px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-faq .faq-layout {
    grid-template-columns: 214px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-rail {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-layout {
    grid-template-columns: 220px minmax(0, 1fr) 272px;
    gap: clamp(28px, 3vw, 46px);
  }

  .page-faq .faq-rail {
    grid-column: auto;
    position: sticky;
    top: var(--faq-sticky);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero__media {
    transform: none;
  }

  .page-faq .faq-item,
  .page-faq .faq-index__list a,
  .page-faq .faq-rail__link,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after {
    transition: none;
  }

  .page-faq .faq-item[open] .faq-item__body {
    animation: none;
  }
}