.page-faq {
  --faq-axis: rgba(53, 167, 255, .18);
  --faq-surface: rgba(18, 48, 78, .52);
  --faq-surface-soft: rgba(14, 39, 64, .26);
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-faq .faq-hero {
  padding-top: clamp(20px, 4vw, 40px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
  align-items: end;
  margin-top: 18px;
}

.page-faq .faq-hero__copy h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 6.6vw, 56px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-faq .faq-hero__copy .lede {
  margin-top: 16px;
  max-width: 62ch;
  font-size: clamp(16px, 2.4vw, 18px);
  line-height: 1.75;
  color: var(--mist-dim);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, var(--faq-surface), rgba(11, 30, 51, .2));
}

.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .04em;
}

.page-faq .faq-stat__key {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-faq .faq-hero__figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, #0E2740, #12304E 55%, #0B1E33);
}

.page-faq .faq-hero__figure .figure__media {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  opacity: .92;
}

/* ---------- 主体：分类导航 + 问答墙 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(36px, 6vw, 64px);
}

.page-faq .faq-nav {
  padding: 16px 4px 0;
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-nav__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-nav__list li {
  flex: 0 0 auto;
}

.page-faq .faq-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--mist-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .25s ease, color .25s ease, background-color .25s ease;
}

.page-faq .faq-nav__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: .55;
  animation: faq-pulse 2.6s ease-in-out infinite;
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--mist);
  border-color: var(--cyan);
  background: rgba(47, 230, 200, .08);
}

@keyframes faq-pulse {
  0%, 100% { opacity: .35; transform: scale(.9); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* ---------- 分组 ---------- */
.page-faq .faq-groups {
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 3.6vw, 36px);
  min-width: 0;
}

.page-faq .faq-group {
  padding: clamp(20px, 3.4vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: linear-gradient(180deg, var(--faq-surface), var(--faq-surface-soft));
  scroll-margin-top: 96px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  align-items: baseline;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-group__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--coral);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.3;
  color: var(--mist);
}

.page-faq .faq-group__note {
  grid-column: 2 / -1;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  margin-top: 8px;
}

.page-faq .faq-item {
  border-left: 2px solid var(--line-soft);
  transition: border-color .3s ease;
}

.page-faq .faq-item + .faq-item {
  border-top: 1px solid rgba(124, 147, 168, .14);
}

.page-faq .faq-item[open] {
  border-left-color: var(--cyan);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 6px 16px 16px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.6;
  color: var(--mist);
  transition: color .2s ease;
}

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

.page-faq .faq-item__q:hover {
  color: var(--cyan);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: var(--radius-s);
}

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

.page-faq .faq-item__chev {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 8px;
  margin-right: 4px;
  border-right: 2px solid var(--slate);
  border-bottom: 2px solid var(--slate);
  transform: rotate(45deg);
  transition: transform .28s ease, border-color .28s ease;
}

.page-faq .faq-item[open] .faq-item__chev {
  transform: rotate(-135deg);
  border-color: var(--cyan);
  margin-top: 12px;
}

.page-faq .faq-item__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .32s ease;
}

.page-faq .faq-item[open] .faq-item__body {
  grid-template-rows: 1fr;
}

.page-faq .faq-item__inner {
  overflow: hidden;
  padding-left: 16px;
}

.page-faq .faq-item[open] .faq-item__inner {
  padding-bottom: 18px;
  animation: faq-fade .34s ease both;
}

.page-faq .faq-item__inner p {
  margin: 0 0 10px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-dim);
}

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

.page-faq .faq-item__inner a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 167, 255, .4);
  transition: color .2s ease, border-color .2s ease;
}

.page-faq .faq-item__inner a:hover,
.page-faq .faq-item__inner a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

@keyframes faq-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ---------- 图示与插图 ---------- */
.page-faq .faq-diagram {
  display: block;
  width: min(100%, 340px);
  height: auto;
  margin: 14px 0 16px;
  padding: 10px 12px;
  border-radius: var(--radius-m);
  background: rgba(11, 30, 51, .5);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, #0E2740, #0B1E33);
}

.page-faq .faq-figure .figure__media {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  opacity: .9;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-body {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: 96px;
    padding-top: 6px;
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .faq-nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 9px 12px;
    border-color: transparent;
    border-radius: var(--radius-s);
  }

  .page-faq .faq-nav__link:hover,
  .page-faq .faq-nav__link:focus-visible {
    border-color: var(--line);
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-nav__dot {
    animation: none;
    opacity: .8;
  }

  .page-faq .faq-item__body,
  .page-faq .faq-item__chev,
  .page-faq .faq-item {
    transition: none;
  }

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