/* ===== 页面专属 CSS — 限定 .page-faq 作用域 ===== */
.page-faq {
  --faq-card-bg: #ffffff;
  --faq-sidebar-bg: var(--tech-white, #F5F5F5);
  --faq-border-light: var(--soft-purple, #E1BEE7);
  --faq-text-dark: var(--deep-space-gray, #1A1A2E);
  --faq-text-light: #ffffff;
  --faq-radius: 12px;
  --faq-spacing: 1.5rem;
  --faq-transition: var(--transition, 0.3s ease-in-out);
  --faq-shadow: 0 4px 20px rgba(0, 51, 102, 0.08);
  --faq-shadow-hover: 0 8px 32px rgba(0, 51, 102, 0.14);

  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 1rem 1rem 3rem;
  font-family: var(--font-body, 'Inter', sans-serif);
  color: var(--faq-text-dark);
  background: var(--faq-sidebar-bg);
}

/* 面包屑 */
.page-faq__breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  color: var(--deep-blue, #003366);
  margin-bottom: 0.75rem;
}
.page-faq__breadcrumb a {
  color: var(--electric-purple, #7B2D8E);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--faq-transition);
}
.page-faq__breadcrumb a:hover,
.page-faq__breadcrumb a:focus-visible {
  color: var(--vibrant-orange, #FF6F00);
  outline: 2px solid var(--vibrant-orange, #FF6F00);
  outline-offset: 2px;
  border-radius: 2px;
}
.page-faq__breadcrumb-sep {
  color: var(--deep-blue, #003366);
  font-weight: 300;
}
.page-faq__breadcrumb [aria-current="page"] {
  color: var(--deep-space-gray, #1A1A2E);
  font-weight: 600;
}

/* 页面标题区 */
.page-faq__hero {
  margin-bottom: 2rem;
  border-left: 6px solid var(--electric-purple, #7B2D8E);
  padding-left: 1.25rem;
}
.page-faq__title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 2.25rem;
  font-weight: 800;
  font-style: italic;
  color: var(--deep-blue, #003366);
  margin: 0 0 0.25rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.page-faq__subtitle {
  font-size: 1rem;
  color: var(--deep-space-gray, #1A1A2E);
  margin: 0;
  opacity: 0.75;
  font-weight: 400;
}

/* 左右分屏布局 */
.page-faq__layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* 左侧问题列表 */
.page-faq__sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: var(--faq-card-bg);
  border-radius: var(--faq-radius);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--faq-shadow);
  border: 1px solid var(--faq-border-light);
}
.page-faq__category {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.page-faq__cat-heading {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--deep-blue, #003366);
  margin: 0 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 3px solid var(--electric-purple, #7B2D8E);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-faq__cat-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--faq-text-light);
  background: var(--electric-purple, #7B2D8E);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  line-height: 1.4;
}

/* 问题标签 — 可点击 */
.page-faq__q-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem 0.6rem 1rem;
  margin: 0;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--deep-blue, #003366);
  background: transparent;
  border: 1px solid transparent;
  transition: background var(--faq-transition), border-color var(--faq-transition), box-shadow var(--faq-transition);
  user-select: none;
}
.page-faq__q-label:hover {
  background: var(--soft-purple, #E1BEE7);
  border-color: var(--electric-purple, #7B2D8E);
}
.page-faq__q-label:focus-visible {
  outline: 2px solid var(--vibrant-orange, #FF6F00);
  outline-offset: 2px;
}
.page-faq__q-label-text {
  flex: 1;
  min-width: 0;
}

/* 箭头图标 */
.page-faq__arrow {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  color: var(--electric-purple, #7B2D8E);
  transition: transform var(--faq-transition);
}

/* 右侧答案区域 */
.page-faq__content {
  position: relative;
  background: var(--faq-card-bg);
  border-radius: var(--faq-radius);
  box-shadow: var(--faq-shadow);
  border: 1px solid var(--faq-border-light);
  min-height: 280px;
  overflow: hidden;
}

/* 隐藏所有 radio */
.page-faq__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 答案卡片 — 默认隐藏 */
.page-faq__answer {
  visibility: hidden;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: visibility 0s var(--faq-transition), opacity var(--faq-transition), max-height 0.45s ease;
  padding: 0 1.5rem;
  margin: 0;
  background: var(--faq-card-bg);
  border-radius: var(--faq-radius);
  box-sizing: border-box;
}

/* radio 选中时显示对应的答案 */
.page-faq__radio:checked + .page-faq__answer {
  visibility: visible;
  opacity: 1;
  max-height: 800px;
  padding: 1.75rem 1.5rem;
  transition: visibility 0s 0s, opacity var(--faq-transition), max-height 0.45s ease;
}

/* 答案内部样式 */
.page-faq__answer-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--faq-text-light);
  background: var(--vibrant-orange, #FF6F00);
  border-radius: 6px;
  padding: 0.15rem 0.7rem;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}
.page-faq__answer-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--deep-blue, #003366);
  margin: 0 0 0.75rem;
  line-height: 1.3;
}
.page-faq__answer-text {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--deep-space-gray, #1A1A2E);
  margin: 0 0 1rem;
  max-width: 680px;
}
.page-faq__answer-img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.25rem 0 0.25rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  object-fit: cover;
}

/* 答案中的链接 */
.page-faq__link {
  color: var(--electric-purple, #7B2D8E);
  text-decoration: underline;
  font-weight: 500;
  transition: color var(--faq-transition);
}
.page-faq__link:hover,
.page-faq__link:focus-visible {
  color: var(--vibrant-orange, #FF6F00);
  outline: 2px solid var(--vibrant-orange, #FF6F00);
  outline-offset: 2px;
  border-radius: 2px;
}

/* 底部号召 */
.page-faq__cta {
  margin-top: 2.5rem;
  text-align: center;
  padding: 1.5rem;
  background: var(--deep-blue, #003366);
  border-radius: var(--faq-radius);
  box-shadow: var(--faq-shadow);
}
.page-faq__cta-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--faq-text-light);
  margin: 0 0 1rem;
}
.page-faq__cta-btn {
  display: inline-block;
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 700;
  font-size: 1rem;
  color: var(--faq-text-light);
  background: var(--vibrant-orange, #FF6F00);
  padding: 0.7rem 2.2rem;
  border-radius: 40px;
  text-decoration: none;
  transition: background var(--faq-transition), transform 0.15s ease;
  box-shadow: 0 4px 12px rgba(255, 111, 0, 0.3);
}
.page-faq__cta-btn:hover,
.page-faq__cta-btn:focus-visible {
  background: var(--electric-purple, #7B2D8E);
  transform: scale(1.03);
  outline: 2px solid var(--vibrant-orange, #FF6F00);
  outline-offset: 3px;
}

/* ---- 选中状态高亮（使用 :has() ） ---- */
.page-faq:has(#faq-q1:checked) [for="faq-q1"],
.page-faq:has(#faq-q2:checked) [for="faq-q2"],
.page-faq:has(#faq-q3:checked) [for="faq-q3"],
.page-faq:has(#faq-q4:checked) [for="faq-q4"],
.page-faq:has(#faq-q5:checked) [for="faq-q5"],
.page-faq:has(#faq-q6:checked) [for="faq-q6"],
.page-faq:has(#faq-q7:checked) [for="faq-q7"],
.page-faq:has(#faq-q8:checked) [for="faq-q8"],
.page-faq:has(#faq-q9:checked) [for="faq-q9"],
.page-faq:has(#faq-q10:checked) [for="faq-q10"],
.page-faq:has(#faq-q11:checked) [for="faq-q11"],
.page-faq:has(#faq-q12:checked) [for="faq-q12"] {
  background: var(--electric-purple, #7B2D8E);
  color: var(--faq-text-light);
  border-color: var(--electric-purple, #7B2D8E);
  box-shadow: 0 2px 12px rgba(123, 45, 142, 0.15);
}
.page-faq:has(#faq-q1:checked) [for="faq-q1"] .page-faq__arrow,
.page-faq:has(#faq-q2:checked) [for="faq-q2"] .page-faq__arrow,
.page-faq:has(#faq-q3:checked) [for="faq-q3"] .page-faq__arrow,
.page-faq:has(#faq-q4:checked) [for="faq-q4"] .page-faq__arrow,
.page-faq:has(#faq-q5:checked) [for="faq-q5"] .page-faq__arrow,
.page-faq:has(#faq-q6:checked) [for="faq-q6"] .page-faq__arrow,
.page-faq:has(#faq-q7:checked) [for="faq-q7"] .page-faq__arrow,
.page-faq:has(#faq-q8:checked) [for="faq-q8"] .page-faq__arrow,
.page-faq:has(#faq-q9:checked) [for="faq-q9"] .page-faq__arrow,
.page-faq:has(#faq-q10:checked) [for="faq-q10"] .page-faq__arrow,
.page-faq:has(#faq-q11:checked) [for="faq-q11"] .page-faq__arrow,
.page-faq:has(#faq-q12:checked) [for="faq-q12"] .page-faq__arrow {
  transform: rotate(90deg);
  color: var(--faq-text-light);
}

/* 当 radio 选中时，同一分类下的其他问题保持可读 */
/* 无需额外覆盖，因为 :has() 只精确匹配当前选中的 label */

/* ---------- 桌面端媒体查询 (≥768px) ---------- */
@media (min-width: 768px) {
  .page-faq {
    padding: 2rem 2rem 4rem;
  }
  .page-faq__title {
    font-size: 3rem;
  }
  .page-faq__subtitle {
    font-size: 1.1rem;
  }
  .page-faq__layout {
    flex-direction: row;
    gap: 2rem;
    align-items: flex-start;
  }
  .page-faq__sidebar {
    flex: 0 0 340px;
    position: sticky;
    top: 1.5rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    padding: 1.75rem 1.5rem;
  }
  .page-faq__content {
    flex: 1;
    min-height: 400px;
  }
  .page-faq__answer {
    padding: 0 2rem;
  }
  .page-faq__radio:checked + .page-faq__answer {
    padding: 2rem 2rem 2.25rem;
  }
  .page-faq__answer-title {
    font-size: 1.5rem;
  }
  .page-faq__cat-heading {
    font-size: 1.05rem;
  }
  .page-faq__q-label {
    font-size: 0.95rem;
    padding: 0.65rem 0.85rem 0.65rem 1.1rem;
  }
  .page-faq__cta {
    margin-top: 3rem;
    padding: 2rem;
  }
  .page-faq__cta-text {
    font-size: 1.2rem;
  }
}

/* ---------- 大桌面端微调 (≥1024px) ---------- */
@media (min-width: 1024px) {
  .page-faq__sidebar {
    flex: 0 0 380px;
    padding: 2rem 1.75rem;
  }
  .page-faq__content {
    min-height: 480px;
  }
  .page-faq__answer-img {
    max-width: 90%;
  }
}

/* ---------- 窄屏安全 (≤420px) ---------- */
@media (max-width: 420px) {
  .page-faq {
    padding: 0.75rem 0.75rem 2rem;
  }
  .page-faq__title {
    font-size: 1.6rem;
  }
  .page-faq__hero {
    padding-left: 0.75rem;
    border-left-width: 4px;
  }
  .page-faq__sidebar {
    padding: 1rem 0.75rem;
  }
  .page-faq__q-label {
    font-size: 0.82rem;
    padding: 0.5rem 0.6rem;
  }
  .page-faq__cat-heading {
    font-size: 0.9rem;
  }
  .page-faq__answer-title {
    font-size: 1.1rem;
  }
  .page-faq__radio:checked + .page-faq__answer {
    padding: 1.25rem 1rem;
  }
  .page-faq__cta {
    padding: 1.25rem 0.75rem;
  }
}