.page-faq {
  --faq-rail-w: 252px;
  --faq-line: rgba(37, 48, 92, 0.9);
  padding-bottom: clamp(3rem, 8vw, 6rem);
  color: var(--stardust);
}

.page-faq .breadcrumb {
  padding-block: clamp(1rem, 3vw, 1.75rem) 0.5rem;
  font-size: 0.85rem;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: center;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2rem, 5vw, 3.25rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -18% -6% -10% -6%;
  background:
    radial-gradient(52% 58% at 12% 4%, rgba(123, 47, 190, 0.32), transparent 68%),
    radial-gradient(46% 46% at 92% 16%, rgba(245, 197, 24, 0.13), transparent 70%);
  pointer-events: none;
  border-radius: 48% 52% 60% 40% / 40% 46% 54% 60%;
}

.page-faq .faq-hero > * {
  position: relative;
}

.page-faq .faq-hero h1 {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.12;
  font-size: clamp(1.95rem, 5vw, 3.3rem);
}

.page-faq .faq-hero .section-lead {
  margin-top: 1rem;
  max-width: 62ch;
  color: var(--nebula);
  line-height: 1.78;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
}

.page-faq .faq-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1.75rem 0 0;
  padding: 0;
}

.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--orbit);
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, rgba(20, 27, 60, 0.9), rgba(11, 16, 38, 0.7));
}

.page-faq .faq-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  color: var(--gold);
  line-height: 1.15;
}

.page-faq .faq-stat-label {
  font-size: 0.82rem;
  color: var(--nebula);
}

.page-faq .faq-hero-media {
  margin: 0;
  aspect-ratio: 5 / 3;
  border-radius: var(--radius-lg);
  border: 1px solid var(--orbit);
  background: radial-gradient(80% 90% at 30% 10%, rgba(123, 47, 190, 0.28), transparent 70%), #0E1430;
}

.page-faq .faq-hero-media img,
.page-faq .faq-inline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding-top: clamp(1rem, 3vw, 2rem);
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-rail-title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--nebula);
}

.page-faq .faq-rail-list {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-rail-btn {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  width: auto;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--orbit);
  border-radius: 999px;
  background: rgba(20, 27, 60, 0.65);
  color: var(--stardust);
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.page-faq .faq-rail-btn:hover {
  border-color: rgba(123, 47, 190, 0.9);
  background: rgba(123, 47, 190, 0.2);
}

.page-faq .faq-rail-btn.is-active,
.page-faq .faq-rail-btn[aria-pressed="true"] {
  border-color: var(--gold);
  background: var(--gold);
  color: #0B1026;
}

.page-faq .faq-rail-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.76rem;
  opacity: 0.72;
}

/* ---------- 问答流 ---------- */
.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 5vw, 3rem);
  min-width: 0;
}

.page-faq .faq-stream .is-filtered-out {
  display: none;
}

.page-faq .faq-topic {
  scroll-margin-top: calc(var(--bar-h) + 1.5rem);
  min-width: 0;
}

.page-faq .faq-topic-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.85rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-topic-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-faq .faq-topic h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
  font-size: clamp(1.2rem, 2.6vw, 1.65rem);
}

.page-faq .faq-topic-lead {
  margin: 0.85rem 0 1.2rem;
  max-width: 66ch;
  color: var(--nebula);
  line-height: 1.78;
  font-size: 0.95rem;
}

.page-faq .faq-item {
  border: 1px solid var(--orbit);
  border-radius: var(--radius-md);
  background: linear-gradient(158deg, rgba(20, 27, 60, 0.9), rgba(11, 16, 38, 0.78));
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-faq .faq-item + .faq-item {
  margin-top: 0.7rem;
}

.page-faq .faq-item:hover {
  border-color: rgba(123, 47, 190, 0.75);
}

.page-faq .faq-item[open] {
  border-color: rgba(245, 197, 24, 0.45);
  box-shadow: 0 16px 38px -28px rgba(245, 197, 24, 0.8);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--stardust);
  transition: color 0.25s ease;
}

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

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-item[open] > summary {
  color: var(--gold);
}

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

.page-faq .faq-toggle {
  flex: 0 0 auto;
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 0.1rem;
  border: 1px solid var(--orbit);
  border-radius: 50%;
  transition: border-color 0.3s ease;
}

.page-faq .faq-toggle::before,
.page-faq .faq-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-toggle::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: opacity 0.3s ease;
}

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

.page-faq .faq-item[open] .faq-toggle::after {
  opacity: 0;
}

.page-faq .faq-answer {
  padding: 0.9rem 1.1rem 1.15rem;
  margin-top: 0.1rem;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-answer p {
  margin: 0 0 0.7rem;
  color: var(--nebula);
  font-size: 0.94rem;
  line-height: 1.8;
  max-width: 68ch;
}

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

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

.page-faq .faq-inline-figure {
  margin: 1.5rem 0 0;
  border: 1px solid var(--orbit);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #0E1430;
}

.page-faq .faq-inline-figure img {
  height: auto;
  aspect-ratio: 8 / 5;
}

.page-faq .faq-inline-figure figcaption {
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--faq-line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--nebula);
  letter-spacing: 0.02em;
}

/* ---------- 结尾 ---------- */
.page-faq .faq-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  padding: clamp(1.4rem, 4vw, 2.5rem);
  border: 1px solid var(--orbit);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(123, 47, 190, 0.36), transparent 62%),
    linear-gradient(150deg, #141B3C, #0B1026);
}

.page-faq .faq-cta h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(1.25rem, 2.8vw, 1.75rem);
}

.page-faq .faq-cta p {
  margin: 0;
  max-width: 58ch;
  color: var(--nebula);
  line-height: 1.78;
  font-size: 0.95rem;
}

.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

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

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail-inner {
    position: sticky;
    top: calc(var(--bar-h) + 1.5rem);
    padding-right: 0.5rem;
  }

  .page-faq .faq-rail-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 0.4rem;
  }

  .page-faq .faq-rail-btn {
    width: 100%;
    justify-content: space-between;
    border-radius: var(--radius-sm);
    padding: 0.7rem 0.85rem;
    white-space: normal;
    text-align: left;
  }

  .page-faq .faq-rail-count {
    margin-left: auto;
  }

  .page-faq .faq-topic-head {
    flex-wrap: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-rail-btn,
  .page-faq .faq-toggle,
  .page-faq .faq-toggle::after {
    transition: none;
  }
}