/* ===== 页面作用域：.page-faq ===== */
.page-faq {
  --faq-bg: var(--color-cream, #F4F1EA);
  --faq-sidebar-bg: var(--color-blue-dark, #1A2A4A);
  --faq-sidebar-text: #FFFFFF;
  --faq-gold: var(--color-gold, #F1C40F);
  --faq-red: var(--color-red, #C41030);
  --faq-card-bg: #FFFFFF;
  --faq-text: #222222;
  --faq-muted: #666666;
  --faq-border: #E0DDD5;
  --faq-sidebar-width: 300px;
  --faq-radius: 8px;
  --faq-transition: 0.3s ease;
  display: block;
  width: 100%;
  background: var(--faq-bg);
  font-family: var(--font-body, 'Georgia', 'Songti SC', serif);
  color: var(--faq-text);
}

/* ===== Hero 区域 ===== */
.faq-hero {
  position: relative;
  width: 100%;
  height: auto;
  min-height: 220px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-blue-deep, #0B1A33);
}
.faq-hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
  pointer-events: none;
}
.faq-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 26, 50, 0.85) 0%, rgba(196, 16, 48, 0.30) 100%);
  pointer-events: none;
}
.faq-hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: #FFFFFF;
}
.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-family: var(--font-heading, 'Microsoft YaHei', sans-serif);
  margin-bottom: 1rem;
  color: rgba(255,255,255,0.7);
}
.breadcrumb a {
  color: var(--faq-gold);
  text-decoration: none;
  transition: color var(--faq-transition);
}
.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: #FFFFFF;
  text-decoration: underline;
}
.breadcrumb-sep {
  color: rgba(255,255,255,0.4);
}
.breadcrumb [aria-current="page"] {
  color: #FFFFFF;
  font-weight: 600;
}
.faq-hero-title {
  font-family: var(--font-heading, 'Microsoft YaHei', sans-serif);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
  line-height: 1.15;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.faq-hero-desc {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.6;
  color: rgba(255,255,255,0.88);
  font-family: var(--font-body, 'Georgia', 'Songti SC', serif);
}

/* ===== 左右分屏布局 ===== */
.faq-layout {
  display: flex;
  flex-direction: column;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
  gap: 2rem;
}

/* ===== 左侧索引 ===== */
.faq-sidebar {
  background: var(--faq-sidebar-bg);
  border-radius: var(--faq-radius);
  padding: 1.5rem 1.2rem;
  color: var(--faq-sidebar-text);
  font-family: var(--font-heading, 'Microsoft YaHei', sans-serif);
  box-shadow: 0 4px 24px rgba(0,0,0,0.18);
  position: relative;
  overflow: hidden;
}
.faq-sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--faq-gold), var(--faq-red));
  opacity: 0.6;
}
/* 搜索框 */
.faq-search-box {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.20);
  border-radius: 50px;
  padding: 0.5rem 1rem;
  margin-bottom: 1.8rem;
  transition: border-color var(--faq-transition), background var(--faq-transition);
}
.faq-search-box:focus-within {
  border-color: var(--faq-gold);
  background: rgba(255,255,255,0.16);
}
.faq-search-icon {
  flex-shrink: 0;
  color: var(--faq-gold);
  opacity: 0.8;
}
.faq-search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #FFFFFF;
  font-size: 0.95rem;
  font-family: var(--font-heading, 'Microsoft YaHei', sans-serif);
  min-width: 0;
}
.faq-search-input::placeholder {
  color: rgba(255,255,255,0.50);
  font-style: italic;
}
/* 分类索引 */
.faq-categories {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.faq-category {
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 0.8rem;
}
.faq-category:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.faq-category-label {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}
.faq-pinyin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--faq-gold);
  color: var(--color-blue-dark, #1A2A4A);
  font-size: 0.8rem;
  font-weight: 800;
  flex-shrink: 0;
  line-height: 1;
}
.faq-category-items {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.faq-category-link {
  display: block;
  color: rgba(255,255,255,0.78);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 400;
  padding: 0.25rem 0;
  border-radius: 4px;
  transition: color var(--faq-transition), padding-left var(--faq-transition);
  position: relative;
}
.faq-category-link::before {
  content: '–';
  position: absolute;
  left: -1rem;
  opacity: 0.4;
  color: var(--faq-gold);
}
.faq-category-link:hover,
.faq-category-link:focus-visible {
  color: var(--faq-gold);
  padding-left: 0.25rem;
}
.faq-category-link:focus-visible {
  outline: 2px solid var(--faq-gold);
  outline-offset: 2px;
}

/* ===== 右侧问答区 ===== */
.faq-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.faq-section {
  scroll-margin-top: 2rem;
}
.faq-section-title {
  font-family: var(--font-heading, 'Microsoft YaHei', sans-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-blue-dark, #1A2A4A);
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--faq-border);
}
.faq-section-pinyin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background: var(--faq-red);
  color: #FFFFFF;
  font-size: 0.9rem;
  font-weight: 800;
  flex-shrink: 0;
  line-height: 1;
}

/* ===== 问答卡片 ===== */
.faq-card {
  background: var(--faq-card-bg);
  border-radius: var(--faq-radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  margin-bottom: 0.75rem;
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--faq-transition);
  border: 1px solid var(--faq-border);
}
.faq-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 32px 32px 0 0;
  border-color: var(--faq-gold) transparent transparent transparent;
  opacity: 0.5;
  pointer-events: none;
  z-index: 1;
}
.faq-card:hover {
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
}
.faq-card:focus-within {
  box-shadow: 0 0 0 2px var(--faq-gold), 0 4px 24px rgba(0,0,0,0.10);
}
.faq-details {
  display: block;
}
.faq-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.2rem 1rem 1.5rem;
  font-family: var(--font-heading, 'Microsoft YaHei', sans-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-blue-dark, #1A2A4A);
  cursor: pointer;
  list-style: none;
  -webkit-user-select: none;
  user-select: none;
  transition: background var(--faq-transition), color var(--faq-transition);
  position: relative;
  z-index: 2;
}
.faq-summary::-webkit-details-marker {
  display: none;
}
.faq-summary:hover {
  background: rgba(196, 16, 48, 0.04);
}
.faq-details[open] .faq-summary {
  color: var(--faq-red);
  background: rgba(196, 16, 48, 0.04);
}
.faq-q-icon {
  flex-shrink: 0;
  color: var(--faq-red);
  opacity: 0.85;
  transition: transform var(--faq-transition), color var(--faq-transition);
}
.faq-details[open] .faq-q-icon {
  transform: rotate(6deg) scale(1.05);
  color: var(--faq-gold);
}
/* 展开箭头指示 */
.faq-summary::after {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--faq-muted);
  border-bottom: 2px solid var(--faq-muted);
  transform: rotate(45deg);
  margin-left: auto;
  transition: transform var(--faq-transition), border-color var(--faq-transition);
  flex-shrink: 0;
}
.faq-details[open] .faq-summary::after {
  transform: rotate(-135deg);
  border-color: var(--faq-red);
}
.faq-answer {
  padding: 0 1.5rem 1.2rem 1.5rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--faq-text);
  font-family: var(--font-body, 'Georgia', 'Songti SC', serif);
  animation: faqFadeIn 0.35s ease forwards;
}
@keyframes faqFadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
    max-height: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
    max-height: 800px;
  }
}
.faq-answer p {
  margin: 0 0 0.8rem;
}
.faq-answer p:last-child {
  margin-bottom: 0;
}
.faq-link {
  color: var(--faq-red);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--faq-transition);
}
.faq-link:hover,
.faq-link:focus-visible {
  color: var(--faq-gold);
  text-decoration-color: var(--faq-gold);
}
.faq-answer-img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 1rem 0 0.25rem;
  border: 1px solid var(--faq-border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* ===== 响应式 ===== */
/* 移动端优先（单栏）已实现，以下为桌面增强 */
@media (min-width: 768px) {
  .faq-hero {
    min-height: 260px;
  }
  .faq-hero-content {
    padding: 3rem 2.5rem;
  }
  .faq-layout {
    flex-direction: row;
    align-items: flex-start;
    padding: 2.5rem 1.5rem 4rem;
    gap: 2.5rem;
  }
  .faq-sidebar {
    width: var(--faq-sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height, 70px) + 1.5rem);
    max-height: calc(100vh - var(--header-height, 70px) - 3rem);
    overflow-y: auto;
    padding: 1.8rem 1.5rem;
  }
  .faq-sidebar::-webkit-scrollbar {
    width: 4px;
  }
  .faq-sidebar::-webkit-scrollbar-track {
    background: transparent;
  }
  .faq-sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.25);
    border-radius: 4px;
  }
  .faq-main {
    flex: 1;
    min-width: 0;
  }
  .faq-section-title {
    font-size: 1.8rem;
  }
  .faq-summary {
    font-size: 1.1rem;
    padding: 1.1rem 1.5rem 1.1rem 1.8rem;
  }
  .faq-answer {
    padding: 0 1.8rem 1.4rem 1.8rem;
    font-size: 1rem;
  }
  .faq-card {
    margin-bottom: 1rem;
  }
  .faq-card::before {
    border-width: 38px 38px 0 0;
  }
}

@media (min-width: 1024px) {
  .faq-layout {
    padding: 3rem 2rem 5rem;
    gap: 3rem;
  }
  .faq-sidebar {
    width: 320px;
    padding: 2rem 1.8rem;
  }
  .faq-hero-content {
    padding: 4rem 2.5rem;
  }
  .faq-hero-title {
    font-size: 3.2rem;
  }
}

/* 窄屏安全 */
@media (max-width: 360px) {
  .faq-hero-content {
    padding: 1.8rem 1rem;
  }
  .faq-sidebar {
    padding: 1rem 0.8rem;
  }
  .faq-category-items {
    padding-left: 1.5rem;
  }
  .faq-summary {
    font-size: 0.95rem;
    padding: 0.8rem 0.8rem 0.8rem 1rem;
  }
  .faq-answer {
    padding: 0 1rem 1rem 1rem;
    font-size: 0.9rem;
  }
  .faq-card::before {
    border-width: 24px 24px 0 0;
  }
}