/* ===== 页面专属：FAQ (page-faq) ===== */
.page-faq {
  --faq-gap: 1.5rem;
  --faq-radius: 12px;
  --faq-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --faq-max-width: 1240px;
  --faq-card-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  --faq-card-shadow-hover: 0 8px 36px rgba(0, 0, 0, 0.5);
  --faq-gold-glow: 0 0 0 1px rgba(212, 175, 55, 0.1);
  position: relative;
  max-width: var(--faq-max-width);
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
  color: var(--color-text, #E8ECF1);
  font-family: var(--font-primary, 'Inter', 'Helvetica Neue', sans-serif);
}

/* 面包屑 */
.page-faq__breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--color-text-secondary, #A0B0C0);
  margin-bottom: 0.75rem;
  letter-spacing: 0.01em;
}
.page-faq__breadcrumb a {
  color: var(--color-text-secondary, #A0B0C0);
  text-decoration: none;
  transition: color var(--faq-transition);
}
.page-faq__breadcrumb a:hover,
.page-faq__breadcrumb a:focus-visible {
  color: var(--color-gold, #D4AF37);
}
.page-faq__breadcrumb-sep {
  color: var(--color-border, #2C4058);
  font-weight: 300;
}

/* 标题区 */
.page-faq__header {
  position: relative;
  margin-bottom: 1.5rem;
}
.page-faq__title {
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--color-gold, #D4AF37);
  margin: 0 0 0.25rem;
}
.page-faq__subtitle {
  font-size: 1rem;
  font-weight: 300;
  color: var(--color-text-secondary, #A0B0C0);
  letter-spacing: 0.04em;
  margin: 0 0 1rem;
}
.page-faq__header-decor {
  width: 100%;
  height: auto;
  max-height: 80px;
  overflow: hidden;
  border-radius: var(--faq-radius);
  opacity: 0.55;
  margin-top: 0.5rem;
}
.page-faq__header-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  object-position: center top;
}

/* 搜索框 */
.page-faq__search {
  position: relative;
  max-width: 540px;
  margin-bottom: 2rem;
}
.page-faq__search-input {
  display: block;
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 3rem;
  background: var(--color-card, #142A44);
  border: 1px solid var(--color-border, #2C4058);
  border-radius: var(--faq-radius);
  color: var(--color-text, #E8ECF1);
  font-size: 1rem;
  font-weight: 300;
  font-family: inherit;
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
  -webkit-appearance: none;
  appearance: none;
}
.page-faq__search-input::placeholder {
  color: var(--color-text-secondary, #A0B0C0);
  opacity: 0.7;
}
.page-faq__search-input:focus {
  outline: none;
  border-color: var(--color-gold, #D4AF37);
  box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.2);
}
.page-faq__search-icon {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
}

/* 布局：索引 + 网格 */
.page-faq__layout {
  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
}

/* 索引（移动端水平 → 桌面垂直） */
.page-faq__index {
  flex-shrink: 0;
  width: 100%;
}
.page-faq__index-inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  background: var(--color-card, #142A44);
  border-radius: var(--faq-radius);
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border, #2C4058);
}
.page-faq__index-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gold, #D4AF37);
  margin-right: 0.25rem;
}
.page-faq__index-decor {
  display: none;
}
.page-faq__index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}
.page-faq__index-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--color-text-secondary, #A0B0C0);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: color var(--faq-transition), border-color var(--faq-transition);
}
.page-faq__index-link:hover,
.page-faq__index-link:focus-visible {
  color: var(--color-gold, #D4AF37);
  border-bottom-color: var(--color-gold, #D4AF37);
}
.page-faq__index-num {
  font-family: var(--font-mono, 'SFMono-Regular', 'Menlo', 'Monaco', 'Consolas', monospace);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-gold, #D4AF37);
  opacity: 0.8;
}

/* 卡片网格 */
.page-faq__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  flex: 1;
  min-width: 0;
}

/* 卡片基础 */
.page-faq__card {
  background: var(--color-card, #142A44);
  border: 1px solid var(--color-border, #2C4058);
  border-radius: var(--faq-radius);
  box-shadow: var(--faq-card-shadow);
  transition: box-shadow var(--faq-transition), transform var(--faq-transition);
  overflow: hidden;
  cursor: pointer;
  list-style: none;
}
.page-faq__card::-webkit-details-marker {
  display: none;
}
.page-faq__card:hover {
  box-shadow: var(--faq-card-shadow-hover);
  transform: translateY(-2px);
}
.page-faq__card:focus-within {
  border-color: var(--color-gold, #D4AF37);
  box-shadow: var(--faq-gold-glow), var(--faq-card-shadow);
}

/* 卡片摘要（始终可见） */
.page-faq__card-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  padding: 1.25rem 1.25rem 1rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
}
.page-faq__card-summary::-webkit-details-marker {
  display: none;
}
.page-faq__card-summary::marker {
  display: none;
  content: "";
}

/* 卡片图标 */
.page-faq__card-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(212, 175, 55, 0.08);
  border-radius: 10px;
  border: 1px solid rgba(212, 175, 55, 0.15);
}
.page-faq__card-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* 卡片编号 + 标签 */
.page-faq__card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}
.page-faq__card-num {
  font-family: var(--font-mono, 'SFMono-Regular', 'Menlo', 'Monaco', 'Consolas', monospace);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary, #A0B0C0);
  opacity: 0.6;
}
.page-faq__card-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.125rem 0.5rem;
  border-radius: 4px;
  background: rgba(212, 175, 55, 0.15);
  color: var(--color-gold, #D4AF37);
  border: 1px solid rgba(212, 175, 55, 0.2);
}

/* 卡片标题 */
.page-faq__card-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text, #E8ECF1);
  margin: 0;
  flex: 1;
  line-height: 1.2;
}

/* 展开图标 */
.page-faq__card-expand-icon {
  flex-shrink: 0;
  transition: transform var(--faq-transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  opacity: 0.7;
}
.page-faq__card[open] .page-faq__card-expand-icon {
  transform: rotate(180deg);
}

/* 卡片展开体 */
.page-faq__card-body {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  padding: 0 1.25rem;
  transition: max-height 0.5s ease, opacity 0.4s ease, padding 0.3s ease;
}
.page-faq__card[open] .page-faq__card-body {
  max-height: 600px;
  opacity: 1;
  padding: 0 1.25rem 1.25rem;
}

.page-faq__card-desc {
  font-size: 0.9375rem;
  font-weight: 300;
  color: var(--color-text-secondary, #A0B0C0);
  margin: 0 0 0.75rem;
  line-height: 1.5;
}

.page-faq__card-list {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.page-faq__card-list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.9375rem;
  font-weight: 300;
  line-height: 1.55;
  color: var(--color-text, #E8ECF1);
}
.page-faq__card-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-gold, #D4AF37);
  opacity: 0.6;
}
.page-faq__card-list li strong {
  font-weight: 500;
  color: var(--color-gold, #D4AF37);
}

.page-faq__card-more {
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--color-text-secondary, #A0B0C0);
  margin: 0;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border, #2C4058);
}
.page-faq__card-more a {
  color: var(--color-gold, #D4AF37);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--faq-transition);
}
.page-faq__card-more a:hover,
.page-faq__card-more a:focus-visible {
  border-bottom-color: var(--color-gold, #D4AF37);
}

/* 底部脚注 */
.page-faq__footnote {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border, #2C4058);
  text-align: center;
}
.page-faq__footnote-text {
  font-size: 0.9375rem;
  font-weight: 300;
  color: var(--color-text-secondary, #A0B0C0);
  margin: 0;
}
.page-faq__footnote-text a {
  color: var(--color-gold, #D4AF37);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--faq-transition);
}
.page-faq__footnote-text a:hover,
.page-faq__footnote-text a:focus-visible {
  border-bottom-color: var(--color-gold, #D4AF37);
}

/* ===== 桌面端 (≥768px) ===== */
@media (min-width: 768px) {
  .page-faq {
    padding: 2rem 2rem 4rem;
  }
  .page-faq__breadcrumb {
    font-size: 0.875rem;
  }
  .page-faq__header-decor {
    max-height: 100px;
  }
  .page-faq__search {
    max-width: 480px;
  }
  .page-faq__layout {
    flex-direction: row;
    align-items: flex-start;
  }
  /* 索引改为垂直侧栏 */
  .page-faq__index {
    width: 180px;
    flex-shrink: 0;
    position: sticky;
    top: 2rem;
  }
  .page-faq__index-inner {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 0.75rem;
    gap: 0.75rem;
  }
  .page-faq__index-label {
    padding-left: 0.5rem;
  }
  .page-faq__index-decor {
    display: block;
    width: 100%;
    height: auto;
    max-height: 120px;
    overflow: hidden;
    border-radius: 6px;
    opacity: 0.35;
    margin: 0.25rem 0;
  }
  .page-faq__index-img {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    object-fit: cover;
    object-position: center;
  }
  .page-faq__index-list {
    flex-direction: column;
    gap: 0.125rem;
  }
  .page-faq__index-link {
    padding: 0.4rem 0.5rem;
    border-radius: 6px;
    border-bottom: none;
    transition: background var(--faq-transition), color var(--faq-transition);
  }
  .page-faq__index-link:hover,
  .page-faq__index-link:focus-visible {
    background: rgba(212, 175, 55, 0.08);
    border-bottom: none;
  }
  /* 网格：2列，大卡片跨列 */
  .page-faq__grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-faq__card--large {
    grid-column: 1 / -1;
  }
  .page-faq__card-summary {
    padding: 1.5rem 1.5rem 1rem;
  }
  .page-faq__card-title {
    font-size: 1.375rem;
  }
  .page-faq__card-body {
    padding: 0 1.5rem;
  }
  .page-faq__card[open] .page-faq__card-body {
    padding: 0 1.5rem 1.5rem;
  }
}

/* ===== 桌面大屏 (≥1024px) ===== */
@media (min-width: 1024px) {
  .page-faq {
    padding: 3rem 2.5rem 5rem;
  }
  .page-faq__index {
    width: 200px;
  }
  .page-faq__index-decor {
    max-height: 160px;
  }
  .page-faq__grid {
    gap: 1.75rem;
  }
  .page-faq__card-summary {
    padding: 1.75rem 2rem 1.25rem;
  }
  .page-faq__card[open] .page-faq__card-body {
    padding: 0 2rem 1.75rem;
  }
  .page-faq__card-title {
    font-size: 1.5rem;
  }
  .page-faq__footnote {
    margin-top: 3.5rem;
  }
}

/* ===== 辅助类 ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}