.page-faq {
  --faq-accent-platform: var(--color-orange, #FF6B35);
  --faq-accent-data: var(--color-green, #39FF14);
  --faq-accent-contact: var(--color-dark-teal, #0B3D3D);
  --faq-bg: var(--color-light-gray, #F5F5F5);
  --faq-text: var(--color-dark-gray, #333333);
  --faq-question-bg: var(--color-white, #FFFFFF);
  --faq-question-border: #E0E0E0;
  --faq-answer-bg: #FAFAFA;
  --faq-header-bg: var(--color-deep-blue, #1A2A3A);
  --faq-header-text: var(--color-white, #FFFFFF);
  --faq-search-border: var(--color-orange, #FF6B35);
  --faq-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);

  background-color: var(--faq-bg);
  color: var(--faq-text);
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
  line-height: 1.6;
  min-height: 70vh;
}

/* 面包屑（继承共享样式，这里仅微调间距） */
.page-faq .breadcrumb {
  padding: 1rem var(--content-max-width, 1280px) 0;
  max-width: var(--content-max-width, 1280px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  font-size: 0.875rem;
}

/* 头部区域 */
.page-faq__header {
  background: linear-gradient(135deg, var(--faq-header-bg) 0%, #0f1f2f 100%);
  color: var(--faq-header-text);
  text-align: center;
  padding: 2rem 1rem 2.5rem;
  position: relative;
  overflow: hidden;
}

.page-faq__icon {
  width: 80px;
  height: 80px;
  object-fit: contain;
  margin: 0 auto 0.5rem;
  display: block;
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

.page-faq__title {
  font-family: var(--font-heading, 'Helvetica Neue', sans-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin: 0.25rem 0;
  color: var(--color-orange, #FF6B35);
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.page-faq__subtitle {
  font-size: 1.1rem;
  opacity: 0.85;
  margin: 0 0 1.25rem;
}

.page-faq__search-wrapper {
  max-width: 480px;
  margin: 0 auto;
}

.page-faq__search-input {
  width: 100%;
  padding: 0.85rem 1.2rem;
  border: 2px solid var(--faq-search-border);
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(6px);
  color: var(--faq-header-text);
  font-size: 1rem;
  font-family: var(--font-body);
  outline: none;
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
  box-sizing: border-box;
}

.page-faq__search-input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.page-faq__search-input:focus {
  background: rgba(255, 255, 255, 0.25);
  border-color: var(--color-green, #39FF14);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.2);
}

/* 内容区：侧边导航 + 问答 */
.page-faq__content {
  display: flex;
  gap: 2rem;
  max-width: var(--content-max-width, 1280px);
  margin: 2.5rem auto;
  padding: 0 1rem;
  width: 100%;
  box-sizing: border-box;
}

/* 侧边导航 */
.page-faq__nav {
  flex: 0 0 220px;
  position: sticky;
  top: calc(var(--header-height, 60px) + 1.5rem);
  align-self: flex-start;
  background: var(--color-white, #FFFFFF);
  border-radius: 12px;
  padding: 1.5rem 1rem;
  box-shadow: var(--faq-shadow);
}

.page-faq__nav-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-deep-blue, #1A2A3A);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--faq-bg);
}

.page-faq__nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-faq__nav-link {
  display: block;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 0.2s, color 0.2s;
  color: var(--faq-text);
}

.page-faq__nav-link--platform {
  border-left: 4px solid var(--faq-accent-platform);
}

.page-faq__nav-link--data {
  border-left: 4px solid var(--faq-accent-data);
}

.page-faq__nav-link--contact {
  border-left: 4px solid var(--faq-accent-contact);
}

.page-faq__nav-link:hover,
.page-faq__nav-link:focus-visible {
  background: var(--faq-bg);
  color: var(--color-deep-blue, #1A2A3A);
}

/* 问答区域 */
.page-faq__questions {
  flex: 1;
  min-width: 0;
}

.page-faq__category {
  margin-bottom: 2.5rem;
}

.page-faq__category-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid;
  display: inline-block;
}

.page-faq__category-title--platform {
  color: var(--faq-accent-platform);
  border-color: var(--faq-accent-platform);
}

.page-faq__category-title--data {
  color: var(--faq-accent-data);
  border-color: var(--faq-accent-data);
}

.page-faq__category-title--contact {
  color: var(--faq-accent-contact);
  border-color: var(--faq-accent-contact);
}

/* 问答列表 */
.page-faq__qalist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-faq__qaitem {
  background: var(--faq-question-bg);
  border-radius: 10px;
  box-shadow: var(--faq-shadow);
  overflow: hidden;
  border: 1px solid var(--faq-question-border);
  transition: box-shadow 0.2s;
}

.page-faq__qaitem:focus-within,
.page-faq__qaitem:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.page-faq__question {
  width: 100%;
  display: block;
  padding: 1rem 1.2rem;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-deep-blue, #1A2A3A);
  cursor: pointer;
  position: relative;
  transition: background 0.2s;
}

.page-faq__question::after {
  content: '+';
  position: absolute;
  right: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-orange, #FF6B35);
  transition: transform 0.3s;
  line-height: 1;
}

.page-faq__question[aria-expanded="true"]::after {
  transform: translateY(-50%) rotate(45deg);
}

.page-faq__question:hover,
.page-faq__question:focus-visible {
  background: rgba(0, 0, 0, 0.02);
}

.page-faq__answer {
  padding: 0 1.2rem 1rem;
  color: var(--faq-text);
  font-size: 0.95rem;
  border-top: 1px solid var(--faq-question-border);
}

.page-faq__answer[hidden] {
  display: none;
}

.page-faq__answer p {
  margin: 0.75rem 0;
}

.page-faq__answer a {
  color: var(--color-orange, #FF6B35);
  text-decoration: underline;
  font-weight: 500;
}

.page-faq__answer a:hover {
  color: var(--color-deep-blue, #1A2A3A);
}

/* 信任声明 */
.page-faq__trust {
  max-width: var(--content-max-width, 1280px);
  margin: 0 auto 3rem;
  padding: 0 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: #666;
  border-top: 1px solid #ddd;
  padding-top: 1.5rem;
}

/* 移动端优先布局调整 */
@media (max-width: 768px) {
  .page-faq .breadcrumb {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .page-faq__header {
    padding: 1.5rem 1rem 2rem;
  }

  .page-faq__icon {
    width: 60px;
    height: 60px;
  }

  .page-faq__title {
    font-size: 1.8rem;
  }

  .page-faq__subtitle {
    font-size: 0.95rem;
  }

  .page-faq__content {
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1.5rem;
  }

  .page-faq__nav {
    flex: none;
    position: static;
    width: 100%;
    padding: 1rem;
  }

  .page-faq__nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.3rem;
  }

  .page-faq__nav-link {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    border-left-width: 3px;
  }

  .page-faq__category-title {
    font-size: 1.3rem;
  }

  .page-faq__question {
    font-size: 0.95rem;
    padding: 0.85rem 1rem;
  }

  .page-faq__question::after {
    right: 1rem;
  }

  .page-faq__answer {
    padding: 0 1rem 0.85rem;
  }

  .page-faq__trust {
    margin-bottom: 2rem;
    padding-top: 1rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .page-faq__nav {
    flex-basis: 180px;
  }
}