/* ===== 页面专属：page-faq ===== */
.page-faq {
  --faq-border: var(--secondary, #FFD700);
  --faq-bg-panel: var(--primary, #4A0080);
  --faq-bg-item: rgba(255, 255, 255, 0.04);
  --faq-text-light: var(--text-primary, #FFFFFF);
  --faq-text-dim: var(--text-secondary, #B0B0B0);
  --faq-accent-neon: var(--accent1, #00E5FF);
  --faq-radius: 0px;
  --faq-shadow: var(--shadow-heavy, 0 12px 40px rgba(0,0,0,0.6));
  --faq-gap: 2rem;
  position: relative;
  padding: 1.5rem 0 4rem;
  background: var(--neutral-light, #F5F0FF);
  color: #1A1A2E;
  min-height: 100vh;
}

/* 容器继承共享 .container，此处只做微调 */
.page-faq .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  position: relative;
  z-index: 2;
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono, 'Courier Prime', monospace);
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
  color: var(--faq-text-dim);
  letter-spacing: 0.5px;
}
.page-faq .breadcrumb a {
  color: var(--faq-bg-panel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s;
}
.page-faq .breadcrumb a:hover {
  border-color: var(--faq-bg-panel);
}
.page-faq .breadcrumb .sep {
  color: var(--faq-border);
  font-weight: 700;
}
.page-faq .breadcrumb [aria-current="page"] {
  color: var(--faq-bg-panel);
  font-weight: 600;
}

/* 页面标题 */
.page-faq .page-title {
  font-family: var(--font-heading, 'Futura PT', sans-serif);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--faq-bg-panel);
  margin: 0 0 0.5rem;
  position: relative;
  display: inline-block;
}
.page-faq .page-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--gradient-alt, linear-gradient(45deg, #00E5FF, #7FFF00));
  margin-top: 4px;
}

/* 页面描述 */
.page-faq .faq-desc {
  font-family: var(--font-mono, 'Courier Prime', monospace);
  font-size: 0.9rem;
  color: #555;
  margin-bottom: 2.5rem;
  max-width: 720px;
  line-height: 1.6;
  padding-left: 0.5rem;
  border-left: 3px solid var(--faq-border);
}

/* 网格容器 */
.page-faq .faq-grid {
  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
}

/* ===== 分类面板 ===== */
.page-faq .faq-category {
  background: var(--faq-bg-panel);
  border: 4px solid var(--faq-border);
  box-shadow: var(--faq-shadow);
  padding: 1.5rem;
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.page-faq .faq-category:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.7);
}

/* 分类头部 */
.page-faq .category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid rgba(255, 215, 0, 0.25);
  padding-bottom: 0.75rem;
}
.page-faq .cat-icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
  filter: drop-shadow(0 0 6px rgba(0, 229, 255, 0.3));
  border-radius: 0;
}
.page-faq .cat-title {
  font-family: var(--font-heading, 'Futura PT', sans-serif);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--faq-text-light);
  margin: 0;
  flex: 1;
}
.page-faq .cat-code {
  font-size: 0.7rem;
  color: var(--faq-border);
  letter-spacing: 3px;
  text-transform: uppercase;
  opacity: 0.7;
  background: rgba(255, 215, 0, 0.1);
  padding: 0.25rem 0.6rem;
  border: 1px solid rgba(255, 215, 0, 0.25);
}

/* 问题列表容器 */
.page-faq .faq-items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ===== 单个折叠项 ===== */
.page-faq .faq-item {
  background: var(--faq-bg-item);
  border-left: 3px solid transparent;
  transition: border-color 0.35s, background 0.35s;
}
.page-faq .faq-item[open] {
  border-left-color: var(--faq-accent-neon);
  background: rgba(255, 255, 255, 0.07);
}

/* summary */
.page-faq .faq-item summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background 0.25s;
  position: relative;
}
.page-faq .faq-item summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item summary::marker {
  display: none;
  content: '';
}
.page-faq .faq-item summary:hover {
  background: rgba(255, 255, 255, 0.06);
}
.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--faq-accent-neon);
  outline-offset: -2px;
}

/* 编号 */
.page-faq .q-num {
  font-family: var(--font-mono, 'Courier Prime', monospace);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--faq-border);
  min-width: 2rem;
  text-align: right;
  letter-spacing: 1px;
  opacity: 0.9;
}

/* 问题文本 */
.page-faq .q-text {
  flex: 1;
  font-family: var(--font-heading, 'Futura PT', sans-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--faq-text-light);
  line-height: 1.4;
  letter-spacing: 0.3px;
}

/* 展开图标 */
.page-faq .q-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--faq-border);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}
.page-faq .faq-item[open] .q-icon {
  transform: rotate(180deg);
  color: var(--faq-accent-neon);
}

/* 答案内容 */
.page-faq .faq-answer {
  padding: 0 1rem 1.25rem calc(2rem + 0.75rem + 0.75rem);
  font-family: var(--font-body, 'Noto Serif SC', serif);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--faq-text-dim);
  border-top: 1px solid rgba(255, 215, 0, 0.1);
  margin-top: 0;
}
.page-faq .faq-answer p {
  margin: 0.75rem 0 0;
}
.page-faq .faq-answer a {
  color: var(--faq-accent-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.25s, text-decoration-color 0.25s;
}
.page-faq .faq-answer a:hover {
  color: var(--faq-border);
  text-decoration-color: var(--faq-border);
}
.page-faq .faq-answer strong {
  color: var(--faq-border);
  font-weight: 600;
}

/* ===== 装饰背景图 ===== */
.page-faq .faq-bg-decoration {
  display: none;
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 200px;
  height: 600px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.12;
  overflow: hidden;
}
.page-faq .faq-bg-decoration .bg-texture {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* ===== 滚动显现动画 ===== */
.page-faq [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-faq [data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}
.page-faq [data-reveal][data-delay="100"] { transition-delay: 0.1s; }
.page-faq [data-reveal][data-delay="200"] { transition-delay: 0.2s; }
.page-faq [data-reveal][data-delay="300"] { transition-delay: 0.3s; }

/* ===== 响应式：桌面端 ≥ 768px ===== */
@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .page-faq .faq-item[open] .q-icon {
    transform: rotate(180deg);
    transition: none;
  }
  .page-faq .faq-category:hover {
    transform: none;
  }
}

/* ===== 桌面端 ≥ 768px ===== */
@media (min-width: 768px) {
  .page-faq {
    padding: 2.5rem 0 5rem;
  }
  .page-faq .container {
    padding: 0 2rem;
  }
  .page-faq .page-title {
    font-size: 3rem;
  }
  .page-faq .faq-desc {
    font-size: 1rem;
    padding-left: 1rem;
  }
  .page-faq .faq-category {
    padding: 2rem;
  }
  .page-faq .cat-icon {
    width: 64px;
    height: 64px;
  }
  .page-faq .cat-title {
    font-size: 1.75rem;
  }
  .page-faq .cat-code {
    font-size: 0.75rem;
  }
  .page-faq .q-num {
    font-size: 0.95rem;
    min-width: 2.5rem;
  }
  .page-faq .q-text {
    font-size: 1.05rem;
  }
  .page-faq .faq-answer {
    font-size: 1rem;
    padding-left: calc(2.5rem + 0.75rem + 0.75rem);
  }
  /* 桌面显示背景装饰 */
  .page-faq .faq-bg-decoration {
    display: block;
    width: 240px;
    height: 700px;
    opacity: 0.1;
  }
}

/* ===== 桌面端 ≥ 1024px ===== */
@media (min-width: 1024px) {
  .page-faq .container {
    padding: 0 3rem;
  }
  .page-faq .page-title {
    font-size: 3.4rem;
  }
  .page-faq .faq-gap {
    gap: 2.5rem;
  }
  .page-faq .faq-category {
    padding: 2.5rem;
  }
  .page-faq .cat-icon {
    width: 72px;
    height: 72px;
  }
  .page-faq .faq-bg-decoration {
    width: 280px;
    height: 800px;
    opacity: 0.12;
  }
  .page-faq .faq-bg-decoration .bg-texture {
    object-position: left center;
  }
}

/* ===== 桌面端 ≥ 1280px ===== */
@media (min-width: 1280px) {
  .page-faq .faq-bg-decoration {
    width: 320px;
    height: 900px;
    opacity: 0.15;
  }
}

/* ===== 动效降级：窄屏安全 ===== */
@media (max-width: 480px) {
  .page-faq .faq-category {
    padding: 1rem;
    border-width: 3px;
  }
  .page-faq .cat-icon {
    width: 40px;
    height: 40px;
  }
  .page-faq .cat-title {
    font-size: 1.25rem;
  }
  .page-faq .q-text {
    font-size: 0.9rem;
  }
  .page-faq .faq-answer {
    font-size: 0.88rem;
    padding-left: 1rem;
    padding-right: 0.5rem;
  }
  .page-faq .q-num {
    font-size: 0.75rem;
    min-width: 1.6rem;
  }
  .page-faq .faq-desc {
    font-size: 0.82rem;
  }
}