.page-faq {
  --faq-red: #E63946;
  --faq-silver: #C0C0C0;
  --faq-dark: #2B2D42;
  --faq-accent: #39FF14;
  --faq-light: #F8F9FA;
  --faq-font-mono: 'JetBrains Mono', 'Consolas', monospace;
  --faq-font-head: 'Inter', -apple-system, sans-serif;
  --faq-font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --faq-radius: 4px;
  --faq-line: 1px solid rgba(192, 192, 192, 0.25);
}

/* 面包屑 */
.page-faq .faq-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--faq-silver);
  margin-bottom: 1.25rem;
  padding: 0.5rem 0;
  border-bottom: var(--faq-line);
  font-family: var(--faq-font-mono);
  letter-spacing: 0.02em;
}
.page-faq .faq-breadcrumb a {
  color: var(--faq-red);
  text-decoration: none;
  transition: color 0.15s;
}
.page-faq .faq-breadcrumb a:hover,
.page-faq .faq-breadcrumb a:focus-visible {
  color: var(--faq-accent);
  outline: none;
}
.page-faq .faq-breadcrumb-sep {
  color: var(--faq-silver);
  user-select: none;
}

/* 标题区域 */
.page-faq .faq-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--faq-red);
  position: relative;
}
.page-faq .faq-header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  right: 0;
  width: 40%;
  height: 2px;
  background: var(--faq-accent);
}
.page-faq .faq-heading {
  font-family: var(--faq-font-head);
  font-size: 2rem;
  font-weight: 700;
  color: var(--faq-dark);
  margin: 0 0 0.375rem;
  letter-spacing: -0.02em;
}
.page-faq .faq-subhead {
  font-family: var(--faq-font-body);
  font-size: 1rem;
  color: var(--faq-dark);
  opacity: 0.8;
  margin: 0;
  max-width: 56ch;
}

/* 两列布局 */
.page-faq .faq-layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* 左侧导航 */
.page-faq .faq-nav {
  order: -1;
  flex-shrink: 0;
  position: relative;
}
.page-faq .faq-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--faq-red) transparent;
  padding-bottom: 0.5rem;
}
.page-faq .faq-nav-list::-webkit-scrollbar {
  height: 3px;
}
.page-faq .faq-nav-list::-webkit-scrollbar-thumb {
  background: var(--faq-red);
  border-radius: 4px;
}
.page-faq .faq-nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-family: var(--faq-font-head);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--faq-dark);
  background: var(--faq-light);
  border: 1px solid var(--faq-silver);
  border-radius: var(--faq-radius);
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.15s;
}
.page-faq .faq-nav-link:hover,
.page-faq .faq-nav-link:focus-visible {
  background: var(--faq-red);
  color: #fff;
  border-color: var(--faq-red);
  outline: none;
}
.page-faq .faq-nav-link:focus-visible {
  box-shadow: 0 0 0 2px var(--faq-accent);
}
.page-faq .faq-nav-num {
  font-family: var(--faq-font-mono);
  font-size: 0.75rem;
  opacity: 0.7;
}
.page-faq .faq-nav-link:hover .faq-nav-num,
.page-faq .faq-nav-link:focus-visible .faq-nav-num {
  opacity: 1;
}
.page-faq .faq-nav-decor {
  display: none;
}

/* 右侧内容 */
.page-faq .faq-content {
  flex: 1;
  min-width: 0;
}

/* 分区 */
.page-faq .faq-section {
  margin-bottom: 2.5rem;
  scroll-margin-top: 1.5rem;
}
.page-faq .faq-section-heading {
  font-family: var(--faq-font-head);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--faq-red);
  margin: 0 0 0.25rem;
  letter-spacing: -0.01em;
}
.page-faq .faq-section-desc {
  font-family: var(--faq-font-body);
  font-size: 0.875rem;
  color: var(--faq-dark);
  opacity: 0.7;
  margin: 0 0 1.25rem;
}

/* 手风琴项 */
.page-faq .faq-item {
  border: var(--faq-line);
  border-radius: var(--faq-radius);
  margin-bottom: 0.75rem;
  background: var(--faq-light);
  transition: border-color 0.15s;
}
.page-faq .faq-item[open] {
  border-color: var(--faq-red);
  background: #fff;
}
.page-faq .faq-question {
  font-family: var(--faq-font-head);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--faq-dark);
  padding: 0.875rem 1rem 0.875rem 2.5rem;
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: color 0.15s;
  user-select: none;
}
.page-faq .faq-question::-webkit-details-marker {
  display: none;
}
.page-faq .faq-question::before {
  content: '+';
  position: absolute;
  left: 1rem;
  top: 50%;
  translate: 0 -50%;
  font-family: var(--faq-font-mono);
  font-size: 1.1rem;
  color: var(--faq-red);
  transition: transform 0.2s;
  line-height: 1;
}
.page-faq .faq-item[open] > .faq-question::before {
  content: '−';
  transform: rotate(0deg);
}
.page-faq .faq-question:hover,
.page-faq .faq-question:focus-visible {
  color: var(--faq-red);
}
.page-faq .faq-question:focus-visible {
  outline: 2px solid var(--faq-accent);
  outline-offset: -2px;
  border-radius: var(--faq-radius);
}
.page-faq .faq-answer {
  padding: 0 1rem 1rem 2.5rem;
  font-family: var(--faq-font-body);
  font-size: 0.9375rem;
  color: var(--faq-dark);
  line-height: 1.65;
}
.page-faq .faq-answer p {
  margin: 0 0 0.75rem;
}
.page-faq .faq-answer p:last-child {
  margin-bottom: 0;
}
.page-faq .faq-answer a {
  color: var(--faq-red);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s;
}
.page-faq .faq-answer a:hover,
.page-faq .faq-answer a:focus-visible {
  color: var(--faq-accent);
  outline: none;
}

/* 高亮关键词 */
.page-faq .faq-highlight {
  font-family: var(--faq-font-mono);
  background: rgba(230, 57, 70, 0.08);
  color: var(--faq-red);
  padding: 0.1em 0.4em;
  border-radius: 2px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* 图片 */
.page-faq .faq-figure {
  margin: 1rem 0 0;
  padding: 0;
  max-width: 100%;
}
.page-faq .faq-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--faq-silver);
  border-radius: var(--faq-radius);
  display: block;
  background: var(--faq-light);
}
.page-faq .faq-caption {
  font-family: var(--faq-font-mono);
  font-size: 0.75rem;
  color: var(--faq-dark);
  opacity: 0.6;
  margin-top: 0.375rem;
  letter-spacing: 0.02em;
}

/* 联系卡片 */
.page-faq .faq-contact-card {
  background: var(--faq-dark);
  padding: 1.5rem 2rem;
  border-radius: var(--faq-radius);
  margin-top: 1rem;
  position: relative;
  overflow: hidden;
}
.page-faq .faq-contact-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--faq-red);
}
.page-faq .faq-contact-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 30%;
  height: 100%;
  background: linear-gradient(135deg, transparent 40%, rgba(57, 255, 20, 0.06) 100%);
  pointer-events: none;
}
.page-faq .faq-contact-heading {
  font-family: var(--faq-font-head);
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 0.5rem;
}
.page-faq .faq-contact-card p {
  font-family: var(--faq-font-body);
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  line-height: 1.6;
}
.page-faq .faq-contact-card a {
  color: var(--faq-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s;
}
.page-faq .faq-contact-card a:hover,
.page-faq .faq-contact-card a:focus-visible {
  color: #fff;
  outline: none;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-faq .faq-layout {
    flex-direction: row;
    gap: 2.5rem;
  }
  .page-faq .faq-nav {
    order: 0;
    width: 14rem;
    flex-shrink: 0;
    position: sticky;
    top: 1.5rem;
    align-self: flex-start;
    max-height: calc(100vh - 3rem);
    overflow-y: auto;
  }
  .page-faq .faq-nav-list {
    flex-direction: column;
    gap: 0.5rem;
    overflow-x: visible;
    padding-bottom: 0;
  }
  .page-faq .faq-nav-link {
    padding: 0.625rem 1rem;
    font-size: 0.9375rem;
    white-space: normal;
    border-left: 3px solid transparent;
  }
  .page-faq .faq-nav-link:hover,
  .page-faq .faq-nav-link:focus-visible {
    border-left-color: var(--faq-accent);
  }
  .page-faq .faq-nav-decor {
    display: block;
    height: 1px;
    background: linear-gradient(90deg, var(--faq-silver), transparent);
    margin-top: 1rem;
  }
  .page-faq .faq-heading {
    font-size: 2.5rem;
  }
  .page-faq .faq-section-heading {
    font-size: 1.5rem;
  }
}

/* ===== 大桌面端 ===== */
@media (min-width: 1024px) {
  .page-faq .faq-nav {
    width: 16rem;
  }
  .page-faq .faq-content {
    max-width: 720px;
  }
}