.page-faq {
  --faq-toc-width: 220px;
  --faq-gap: 2rem;
  --faq-number-size: 2.8rem;
  background-color: var(--dark-bg, #0B0C10);
  color: var(--text-primary, #FFFFFF);
  font-family: var(--font-body, 'Inter', 'PingFang SC', sans-serif);
  min-height: 100vh;
  box-sizing: border-box;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: inherit;
}

/* 面包屑 */
.page-faq .faq-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary, #B0BEC5);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  padding: 0 1rem;
}

.page-faq .faq-breadcrumb a {
  color: var(--text-secondary, #B0BEC5);
  text-decoration: none;
  transition: color 0.2s;
}

.page-faq .faq-breadcrumb a:hover,
.page-faq .faq-breadcrumb a:focus-visible {
  color: var(--primary-red, #E63946);
}

.page-faq .faq-breadcrumb .sep {
  color: var(--primary-red, #E63946);
  user-select: none;
}

/* 页面标题区 */
.page-faq .faq-page-title {
  font-family: var(--font-heading, 'Montserrat', 'PingFang SC', sans-serif);
  font-size: 2.2rem;
  font-weight: 800;
  font-style: italic;
  line-height: 1.2;
  margin: 0 0 0.5rem 0;
  padding: 0 1rem;
  color: var(--text-primary, #FFFFFF);
  letter-spacing: -0.02em;
}

.page-faq .faq-page-desc {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-secondary, #B0BEC5);
  margin: 0 0 2rem 0;
  padding: 0 1rem;
  max-width: 600px;
}

/* 主布局 */
.page-faq .faq-container {
  max-width: var(--content-max, 1200px);
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.page-faq .faq-layout {
  display: flex;
  gap: var(--faq-gap);
  align-items: flex-start;
}

/* 目录侧栏 */
.page-faq .faq-toc {
  flex: 0 0 var(--faq-toc-width);
  position: sticky;
  top: 2rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle, rgba(255,255,255,0.08));
  border-radius: 8px;
  padding: 1.25rem 0.75rem;
}

.page-faq .faq-toc-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--metallic-silver, #B0BEC5);
  margin-bottom: 1rem;
  padding: 0 0.5rem;
  font-weight: 600;
}

.page-faq .faq-toc-list {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.page-faq .faq-toc-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.5rem;
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-secondary, #B0BEC5);
  transition: background 0.2s, color 0.2s;
  font-size: 0.9rem;
  line-height: 1.3;
}

.page-faq .faq-toc-link:hover,
.page-faq .faq-toc-link:focus-visible {
  background: rgba(230, 57, 70, 0.12);
  color: var(--primary-red, #E63946);
}

.page-faq .faq-toc-num {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary-red, #E63946);
  min-width: 1.8em;
}

.page-faq .faq-toc-text {
  font-weight: 500;
}

/* 问答内容区 */
.page-faq .faq-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* 单个问答项 */
.page-faq .faq-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle, rgba(255,255,255,0.08));
  border-radius: 8px;
  transition: border-color 0.3s, box-shadow 0.3s;
  overflow: hidden;
}

.page-faq .faq-item:target {
  border-color: var(--primary-red, #E63946);
  box-shadow: 0 0 0 1px var(--glow-red, rgba(230,57,70,0.4));
}

.page-faq .faq-item-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}

.page-faq .faq-item-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.page-faq .faq-item-number {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--faq-number-size, 2.8rem);
  font-weight: 800;
  line-height: 1;
  color: var(--primary-red, #E63946);
  flex-shrink: 0;
  min-width: 2.8rem;
}

.page-faq .faq-item-question {
  font-family: var(--font-heading, 'Montserrat', 'PingFang SC', sans-serif);
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary, #FFFFFF);
  flex: 1;
}

.page-faq .faq-item-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  position: relative;
  transition: transform 0.35s ease;
}

.page-faq .faq-item-icon::before,
.page-faq .faq-item-icon::after {
  content: '';
  position: absolute;
  background: var(--metallic-silver, #B0BEC5);
  border-radius: 1px;
  transition: transform 0.35s ease, background 0.35s ease;
}

.page-faq .faq-item-icon::before {
  width: 14px;
  height: 2px;
  top: 11px;
  left: 5px;
}

.page-faq .faq-item-icon::after {
  width: 2px;
  height: 14px;
  top: 5px;
  left: 11px;
}

.page-faq .faq-item[data-open] .faq-item-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.page-faq .faq-item[data-open] .faq-item-icon::before {
  background: var(--primary-red, #E63946);
}

/* 答案内容 */
.page-faq .faq-item-body {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-secondary, #B0BEC5);
  font-size: 0.95rem;
  line-height: 1.7;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, opacity 0.4s ease, padding 0.4s ease;
}

.page-faq .faq-item[data-open] .faq-item-body {
  max-height: 600px;
  opacity: 1;
  padding-top: 0;
  padding-bottom: 1.25rem;
}

.page-faq .faq-item-body p {
  margin: 0 0 0.75rem 0;
}

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

.page-faq .faq-link {
  color: var(--primary-red, #E63946);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
  font-weight: 500;
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  border-bottom-color: var(--primary-red, #E63946);
  color: #ff6b77;
}

/* 图片容器 */
.page-faq .faq-img {
  margin-top: 1rem;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border-subtle, rgba(255,255,255,0.08));
  background: var(--metallic-silver, #B0BEC5);
  max-width: 100%;
  width: 500px;
}

.page-faq .faq-img img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 500 / 300;
}

/* 滚动进度条 */
.page-faq [data-scroll-progress] {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  z-index: 999;
  pointer-events: none;
}

.page-faq [data-scroll-progress]::before {
  content: '';
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary-red, #E63946), var(--accent-orange, #F4A261));
  transition: width 0.1s linear;
}

/* ===== 移动端优先 ===== */
@media (max-width: 767px) {
  .page-faq {
    padding-top: 0;
  }

  .page-faq .faq-container {
    padding: 1rem 0.75rem 3rem;
  }

  .page-faq .faq-page-title {
    font-size: 1.6rem;
    padding: 0 0.5rem;
  }

  .page-faq .faq-page-desc {
    font-size: 0.9rem;
    padding: 0 0.5rem;
    margin-bottom: 1.5rem;
  }

  .page-faq .faq-breadcrumb {
    padding: 0 0.5rem;
    font-size: 0.8rem;
  }

  .page-faq .faq-layout {
    flex-direction: column;
    gap: 1.25rem;
  }

  /* 移动端目录转为水平滚动标签 */
  .page-faq .faq-toc {
    flex: none;
    position: static;
    width: 100%;
    padding: 0.75rem 0.5rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
  }

  .page-faq .faq-toc-label {
    font-size: 0.7rem;
    margin-bottom: 0.5rem;
    padding: 0 0.25rem;
  }

  .page-faq .faq-toc-list {
    flex-direction: row;
    overflow-x: auto;
    gap: 0.25rem;
    padding-bottom: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-subtle, rgba(255,255,255,0.08)) transparent;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .faq-toc-list::-webkit-scrollbar {
    height: 3px;
  }

  .page-faq .faq-toc-list::-webkit-scrollbar-thumb {
    background: var(--border-subtle, rgba(255,255,255,0.08));
    border-radius: 4px;
  }

  .page-faq .faq-toc-link {
    flex-shrink: 0;
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    gap: 0.4rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.04);
    white-space: nowrap;
  }

  .page-faq .faq-toc-link:hover {
    background: rgba(230, 57, 70, 0.15);
  }

  .page-faq .faq-toc-num {
    font-size: 0.75rem;
    min-width: auto;
  }

  .page-faq .faq-toc-text {
    font-weight: 400;
  }

  /* 问答项窄屏适配 */
  .page-faq .faq-item-header {
    padding: 1rem 1rem;
    gap: 0.75rem;
  }

  .page-faq .faq-item-number {
    font-size: 2rem;
    min-width: 2rem;
  }

  .page-faq .faq-item-question {
    font-size: 1rem;
  }

  .page-faq .faq-item-body {
    padding: 0 1rem 1rem;
    font-size: 0.88rem;
  }

  .page-faq .faq-item[data-open] .faq-item-body {
    padding-bottom: 1rem;
  }

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

  .page-faq .faq-img img {
    width: 100%;
    height: auto;
  }
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-faq .faq-container {
    padding: 2.5rem 2rem 5rem;
  }

  .page-faq .faq-page-title {
    font-size: 2.6rem;
    padding: 0;
  }

  .page-faq .faq-page-desc {
    padding: 0;
    font-size: 1.05rem;
  }

  .page-faq .faq-breadcrumb {
    padding: 0;
  }

  .page-faq .faq-layout {
    gap: 2.5rem;
  }

  .page-faq .faq-toc {
    padding: 1.5rem 1rem;
  }

  .page-faq .faq-item-header {
    padding: 1.5rem 2rem;
  }

  .page-faq .faq-item-number {
    font-size: 3rem;
    min-width: 3rem;
  }

  .page-faq .faq-item-question {
    font-size: 1.25rem;
  }

  .page-faq .faq-item-body {
    padding: 0 2rem 1.5rem;
    font-size: 1rem;
  }

  .page-faq .faq-item[data-open] .faq-item-body {
    padding-bottom: 1.5rem;
  }
}

/* ===== 大屏微调 ===== */
@media (min-width: 1200px) {
  .page-faq .faq-container {
    padding-left: 0;
    padding-right: 0;
  }

  .page-faq .faq-page-title {
    font-size: 3rem;
  }
}