.page-faq {
  --faq-sidebar-width: 260px;
  --faq-gap: var(--space-lg, 3rem);
  --faq-section-gap: var(--space-xl, 5rem);
  --faq-item-radius: var(--radius-md, 4px);
  --faq-bg-hover: rgba(218, 165, 32, 0.06);
  --faq-border-active: rgba(218, 165, 32, 0.5);
  --faq-glow-subtle: 0 0 12px rgba(218, 165, 32, 0.12);

  position: relative;
  background: var(--gradient-dark, linear-gradient(180deg, #1A1A1A 0%, #0D0D0D 100%));
  color: var(--c-text, #F5F5F5);
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  padding: var(--space-lg, 3rem) 0 var(--space-xl, 5rem);
  min-height: 100vh;
}

/* ── 面包屑 ── */
.page-faq .breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-xs, 0.5rem);
  font-size: 0.875rem;
  color: var(--c-text-dim, #A0A0A0);
  margin-bottom: var(--space-md, 2rem);
  flex-wrap: wrap;
}

.page-faq .breadcrumbs a {
  color: var(--c-gold, #DAA520);
  text-decoration: none;
  transition: color var(--transition, 0.3s);
}

.page-faq .breadcrumbs a:hover,
.page-faq .breadcrumbs a:focus-visible {
  color: var(--c-gold-light, #F0C75E);
  text-decoration: underline;
}

.page-faq .breadcrumbs .separator {
  color: var(--c-text-dim, #A0A0A0);
  user-select: none;
}

.page-faq .breadcrumbs [aria-current="page"] {
  color: var(--c-text, #F5F5F5);
  font-weight: 600;
}

/* ── 页面标题区 ── */
.page-faq .page-intro {
  margin-bottom: var(--space-xl, 5rem);
}

.page-faq .page-heading {
  font-family: var(--font-heading, 'Playfair Display', Georgia, serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-text, #F5F5F5);
  margin: 0 0 var(--space-sm, 1rem);
  letter-spacing: -0.02em;
}

.page-faq .page-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: var(--c-text-dim, #A0A0A0);
  max-width: 680px;
  margin: 0 0 var(--space-md, 2rem);
}

.page-faq .text-divider {
  width: 80px;
  height: 3px;
  background: var(--gradient-red-gold, linear-gradient(135deg, #8B0000 0%, #DAA520 100%));
  border-radius: 2px;
}

/* ── 双栏布局 ── */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  align-items: start;
}

/* ── 侧边栏 ── */
.page-faq .faq-sidebar {
  background: var(--c-dark-alt, #2E2E2E);
  border: 1px solid var(--c-border, rgba(218,165,32,0.25));
  border-radius: var(--faq-item-radius);
  padding: var(--space-md, 2rem);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-red-gold, linear-gradient(135deg, #8B0000 0%, #DAA520 100%));
}

.page-faq .sidebar-heading {
  font-family: var(--font-heading, 'Playfair Display', Georgia, serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-gold, #DAA520);
  margin: 0 0 var(--space-md, 2rem);
  padding-left: var(--space-sm, 1rem);
}

.page-faq .faq-nav-list {
  list-style: none;
  margin: 0 0 var(--space-lg, 3rem);
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm, 1rem);
}

.page-faq .faq-nav-link {
  display: block;
  padding: var(--space-xs, 0.5rem) var(--space-sm, 1rem);
  color: var(--c-text, #F5F5F5);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all var(--transition, 0.3s);
  border-radius: 0 var(--radius-sm, 2px) var(--radius-sm, 2px) 0;
}

.page-faq .faq-nav-link:hover,
.page-faq .faq-nav-link:focus-visible {
  color: var(--c-gold, #DAA520);
  border-left-color: var(--c-gold, #DAA520);
  background: var(--faq-bg-hover);
  outline: none;
}

.page-faq .sidebar-contact-box {
  padding-left: var(--space-sm, 1rem);
  border-top: 1px solid var(--c-border, rgba(218,165,32,0.25));
  padding-top: var(--space-md, 2rem);
}

.page-faq .sidebar-contact-label {
  font-size: 0.9rem;
  color: var(--c-text-dim, #A0A0A0);
  margin: 0 0 var(--space-sm, 1rem);
}

.page-faq .cta-btn {
  display: inline-block;
  padding: 0.7rem 1.8rem;
  background: var(--gradient-red-gold, linear-gradient(135deg, #8B0000 0%, #DAA520 100%));
  color: var(--c-text, #F5F5F5);
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: var(--radius-md, 4px);
  transition: all var(--transition, 0.3s);
  text-align: center;
  border: none;
  cursor: pointer;
  box-shadow: var(--c-glow, 0 0 20px rgba(218,165,32,0.4));
}

.page-faq .cta-btn:hover,
.page-faq .cta-btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(218,165,32,0.6);
  outline: none;
}

/* ── FAQ 主内容区 ── */
.page-faq .faq-content {
  display: flex;
  flex-direction: column;
  gap: var(--faq-section-gap);
}

.page-faq .faq-section {
  scroll-margin-top: 2rem;
}

.page-faq .faq-section-heading {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 1rem);
  font-family: var(--font-heading, 'Playfair Display', Georgia, serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--c-text, #F5F5F5);
  margin: 0 0 var(--space-lg, 3rem);
  line-height: 1.2;
}

.page-faq .section-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--c-dark-alt, #2E2E2E);
  border: 2px solid var(--c-gold, #DAA520);
  border-radius: 50%;
  transition: transform var(--transition, 0.3s);
}

.page-faq .faq-section:hover .section-icon {
  transform: rotate(-6deg) scale(1.05);
}

/* ── 手风琴 ── */
.page-faq .faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm, 1rem);
}

.page-faq .faq-item {
  background: var(--c-dark-alt, #2E2E2E);
  border: 1px solid var(--c-border, rgba(218,165,32,0.25));
  border-radius: var(--faq-item-radius);
  overflow: hidden;
  transition: border-color var(--transition, 0.3s), box-shadow var(--transition, 0.3s);
}

.page-faq .faq-item[open] {
  border-color: var(--faq-border-active);
  box-shadow: var(--faq-glow-subtle);
}

.page-faq .faq-question {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 1rem);
  padding: var(--space-md, 2rem);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background var(--transition, 0.3s);
}

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

.page-faq .faq-question:hover {
  background: var(--faq-bg-hover);
}

.page-faq .faq-q-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  transition: transform var(--transition, 0.3s);
}

.page-faq .faq-item[open] .faq-q-icon {
  transform: scale(1.1);
}

.page-faq .faq-question-text {
  flex: 1;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-text, #F5F5F5);
  line-height: 1.4;
}

.page-faq .faq-item[open] .faq-question-text {
  color: var(--c-gold, #DAA520);
}

.page-faq .faq-toggle-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  transition: transform var(--transition, 0.3s);
}

.page-faq .faq-item[open] .faq-toggle-icon {
  transform: rotate(180deg);
}

.page-faq .faq-toggle-icon svg {
  transition: stroke var(--transition, 0.3s);
}

.page-faq .faq-item[open] .faq-toggle-icon svg {
  stroke: var(--c-gold-light, #F0C75E);
}

.page-faq .faq-answer {
  padding: 0 var(--space-md, 2rem) var(--space-md, 2rem);
  color: var(--c-text-dim, #A0A0A0);
  line-height: 1.7;
  font-size: 0.95rem;
  border-top: 1px solid transparent;
}

.page-faq .faq-item[open] .faq-answer {
  border-top-color: var(--c-border, rgba(218,165,32,0.25));
  animation: faq-fade-in 0.35s ease-out;
}

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

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

.page-faq .faq-answer strong {
  color: var(--c-gold, #DAA520);
  font-weight: 600;
}

/* ── 技术支持区配图 ── */
.page-faq .tech-visual {
  margin: 0 0 var(--space-lg, 3rem);
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm, 1rem);
}

.page-faq .tech-img {
  max-width: 100%;
  height: auto;
  border: 2px solid var(--c-border, rgba(218,165,32,0.25));
  border-radius: var(--radius-md, 4px);
  object-fit: cover;
  transition: border-color var(--transition, 0.3s), box-shadow var(--transition, 0.3s);
}

.page-faq .tech-img:hover {
  border-color: var(--c-gold, #DAA520);
  box-shadow: var(--faq-glow-subtle);
}

.page-faq .tech-caption {
  font-size: 0.85rem;
  color: var(--c-text-dim, #A0A0A0);
  font-style: italic;
  letter-spacing: 0.02em;
}

/* ── 尾部 ── */
.page-faq .faq-outro {
  margin-top: var(--space-lg, 3rem);
}

.page-faq .faq-outro .text-divider {
  margin-bottom: var(--space-md, 2rem);
}

.page-faq .faq-outro-text {
  font-size: 1rem;
  color: var(--c-text-dim, #A0A0A0);
  line-height: 1.7;
}

.page-faq .faq-outro-text a {
  color: var(--c-gold, #DAA520);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition, 0.3s);
}

.page-faq .faq-outro-text a:hover,
.page-faq .faq-outro-text a:focus-visible {
  color: var(--c-gold-light, #F0C75E);
}

/* ── 返回顶部 ── */
.page-faq .back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 100;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-dark-alt, #2E2E2E);
  border: 2px solid var(--c-gold, #DAA520);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition, 0.3s);
  box-shadow: var(--c-glow, 0 0 20px rgba(218,165,32,0.4));
  padding: 0;
  color: var(--c-gold, #DAA520);
}

.page-faq .back-to-top:hover,
.page-faq .back-to-top:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 0 30px rgba(218,165,32,0.6);
  outline: none;
  background: var(--c-primary, #8B0000);
}

.page-faq .back-to-top[hidden] {
  display: none;
}

/* ── 滚动进度条 ── */
.page-faq .scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--gradient-red-gold, linear-gradient(135deg, #8B0000 0%, #DAA520 100%));
  z-index: 200;
  width: 0%;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ── 响应式：平板及以上 ── */
@media (min-width: 768px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-sidebar-width) 1fr;
  }

  .page-faq .faq-sidebar {
    position: sticky;
    top: 2rem;
  }

  .page-faq .faq-nav-list {
    gap: var(--space-xs, 0.5rem);
  }

  .page-faq .faq-question {
    padding: var(--space-md, 2rem) var(--space-lg, 3rem);
  }

  .page-faq .faq-answer {
    padding: 0 var(--space-lg, 3rem) var(--space-md, 2rem);
  }

  .page-faq .tech-img {
    max-width: 360px;
  }
}

/* ── 桌面大屏 ── */
@media (min-width: 1024px) {
  .page-faq {
    padding: var(--space-xl, 5rem) 0 var(--space-xl, 5rem);
  }

  .page-faq .faq-layout {
    gap: calc(var(--faq-gap) * 1.5);
  }

  .page-faq .faq-sidebar {
    padding: var(--space-lg, 3rem) var(--space-md, 2rem);
  }

  .page-faq .faq-content {
    max-width: 800px;
  }
}

/* ── 移动端安全间距 ── */
@media (max-width: 767px) {
  .page-faq {
    padding: var(--space-md, 2rem) 0 var(--space-lg, 3rem);
  }

  .page-faq .faq-sidebar {
    padding: var(--space-md, 2rem) var(--space-sm, 1rem);
  }

  .page-faq .faq-question {
    padding: var(--space-sm, 1rem) var(--space-md, 2rem);
  }

  .page-faq .faq-answer {
    padding: 0 var(--space-md, 2rem) var(--space-sm, 1rem);
  }

  .page-faq .faq-section-heading {
    font-size: 1.4rem;
  }

  .page-faq .section-icon {
    width: 36px;
    height: 36px;
  }

  .page-faq .section-icon svg {
    width: 20px;
    height: 20px;
  }

  .page-faq .faq-q-icon {
    width: 28px;
    height: 28px;
  }

  .page-faq .faq-q-icon svg {
    width: 18px;
    height: 18px;
  }

  .page-faq .faq-question-text {
    font-size: 0.95rem;
  }

  .page-faq .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }

  .page-faq .tech-visual {
    align-items: center;
  }

  .page-faq .tech-img {
    width: 100%;
    max-width: 280px;
  }
}

/* ── 极窄屏防护 ── */
@media (max-width: 400px) {
  .page-faq .faq-sidebar {
    padding: var(--space-sm, 1rem);
  }

  .page-faq .sidebar-heading {
    font-size: 1.1rem;
  }

  .page-faq .faq-nav-link {
    font-size: 0.85rem;
    padding: var(--space-xs, 0.5rem);
  }

  .page-faq .faq-question {
    padding: var(--space-sm, 1rem);
  }

  .page-faq .faq-answer {
    padding: 0 var(--space-sm, 1rem) var(--space-sm, 1rem);
    font-size: 0.9rem;
  }
}

/* ── 无障碍 ── */
.page-faq .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-faq a:focus-visible,
.page-faq button:focus-visible,
.page-faq details:focus-visible {
  outline: 2px solid var(--c-gold, #DAA520);
  outline-offset: 2px;
}

.page-faq .faq-item:focus-visible {
  outline: 2px solid var(--c-gold, #DAA520);
  outline-offset: 1px;
}

/* ── 减少动效 ── */
@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .page-faq .faq-answer {
    animation: none !important;
  }
}