/* ============================================
   page-faq — 帮助中心页面专属样式
   移动端优先，含桌面端媒体查询
   作用域限定 .page-faq
   ============================================ */
.page-faq {
  --faq-gap: 1.5rem;
  --faq-card-radius: 12px;
  --faq-transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-primary);
  padding: 1.25rem 1rem 2.5rem;
  max-width: 1120px;
  margin: 0 auto;
  min-height: 80vh;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--neutral-gray);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.page-faq .breadcrumb a {
  color: var(--neutral-gray);
  text-decoration: none;
  transition: color var(--faq-transition);
}
.page-faq .breadcrumb a:hover {
  color: var(--accent-blue);
}
.page-faq .breadcrumb .breadcrumb-current {
  color: var(--text-secondary);
  pointer-events: none;
}
.page-faq .breadcrumb-sep {
  color: var(--bg-tertiary);
  user-select: none;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 3rem;
}
.page-faq .faq-hero-content {
  flex: 1;
}
.page-faq .faq-hero .section-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1.15;
  margin: 0 0 0.75rem;
  background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-faq .faq-hero-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 0 1.5rem;
}
/* 搜索框 */
.page-faq .faq-search {
  position: relative;
  max-width: 480px;
  margin-bottom: 1.25rem;
}
.page-faq .faq-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--neutral-gray);
  pointer-events: none;
  transition: color var(--faq-transition);
}
.page-faq .faq-search-input {
  display: block;
  width: 100%;
  padding: 0.85rem 1rem 0.85rem 3rem;
  background: var(--glass-light);
  border: 1px solid var(--bg-tertiary);
  border-radius: 60px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.page-faq .faq-search-input::placeholder {
  color: var(--neutral-gray);
  opacity: 0.7;
}
.page-faq .faq-search-input:focus {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.15);
}
.page-faq .faq-search-input:focus ~ .faq-search-icon {
  color: var(--accent-green);
}
/* 热门标签 */
.page-faq .faq-hot {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.page-faq .faq-hot-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--neutral-gray);
  text-transform: uppercase;
}
.page-faq .faq-hot-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-faq .faq-hot-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 1rem;
  background: var(--glass-light);
  border: 1px solid var(--bg-tertiary);
  border-radius: 40px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--faq-transition);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.page-faq .faq-hot-tag:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(0, 191, 255, 0.08);
}
.page-faq .faq-hot-tag:active {
  transform: scale(0.97);
}
/* 首屏视觉 */
.page-faq .faq-hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-faq .faq-hero-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--faq-card-radius);
  object-fit: cover;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--glass-light);
}

/* ---------- 分类标签 ---------- */
.page-faq .faq-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--bg-tertiary);
  padding-bottom: 0.75rem;
}
.page-faq .faq-tab {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  padding: 0.5rem 1.25rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 40px;
  color: var(--neutral-gray);
  cursor: pointer;
  transition: all var(--faq-transition);
  white-space: nowrap;
}
.page-faq .faq-tab:hover {
  color: var(--text-secondary);
  border-color: var(--bg-tertiary);
}
.page-faq .faq-tab.active {
  color: var(--accent-green);
  border-color: var(--accent-green);
  background: rgba(57, 255, 20, 0.06);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.08);
}

/* ---------- 分类内容区域 ---------- */
.page-faq .faq-section {
  display: none;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 3rem;
  animation: faqFadeIn 0.45s ease-out;
}
.page-faq .faq-section.active {
  display: flex;
}
@keyframes faqFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.page-faq .faq-section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.page-faq .faq-section-title .text-mono {
  font-size: 0.85rem;
  color: var(--accent-blue);
  opacity: 0.7;
}
.page-faq .faq-section-desc {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
  max-width: 600px;
}
.page-faq .faq-section-desc a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--faq-transition);
}
.page-faq .faq-section-desc a:hover {
  border-color: var(--accent-blue);
}

/* ---------- 问题列表 ---------- */
.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
}
/* 问题卡片 */
.page-faq .faq-item {
  background: var(--glass-light);
  border: 1px solid var(--bg-tertiary);
  border-radius: var(--faq-card-radius);
  overflow: hidden;
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.page-faq .faq-item:hover {
  border-color: rgba(57, 255, 20, 0.2);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}
.page-faq .faq-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1rem 1.25rem;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  text-align: left;
  gap: 1rem;
  transition: background var(--faq-transition);
}
.page-faq .faq-item-header:hover {
  background: rgba(57, 255, 20, 0.04);
}
.page-faq .faq-item-q {
  flex: 1;
  font-weight: 500;
  line-height: 1.5;
}
.page-faq .faq-item-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--neutral-gray);
  transition: transform var(--faq-transition), color var(--faq-transition);
}
.page-faq .faq-item[data-expanded="true"] .faq-item-icon {
  transform: rotate(180deg);
  color: var(--accent-green);
}
.page-faq .faq-item-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease;
  padding: 0 1.25rem;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.88rem;
  line-height: 1.7;
}
.page-faq .faq-item[data-expanded="true"] .faq-item-body {
  max-height: 400px;
  padding: 0 1.25rem 1.25rem;
}
.page-faq .faq-item-body p {
  margin: 0;
}
.page-faq .faq-item-body a {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--faq-transition);
}
.page-faq .faq-item-body a:hover {
  border-color: var(--accent-blue);
}

/* ---------- 功能区域配图 ---------- */
.page-faq .faq-image-block {
  display: flex;
  justify-content: center;
  margin-top: 0.5rem;
}
.page-faq .faq-image-block img {
  max-width: 100%;
  height: auto;
  border-radius: var(--faq-card-radius);
  object-fit: cover;
  border: 1px solid var(--glass-light);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ---------- 底部联系引导 ---------- */
.page-faq .faq-cta {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--bg-tertiary);
}
.page-faq .faq-cta-card {
  background: var(--glass-medium);
  border: 1px solid var(--bg-tertiary);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  max-width: 520px;
  margin: 0 auto;
  transition: border-color var(--faq-transition);
}
.page-faq .faq-cta-card:hover {
  border-color: rgba(0, 191, 255, 0.25);
}
.page-faq .faq-cta-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-primary);
  margin: 0 0 0.5rem;
}
.page-faq .faq-cta-desc {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 0 1.25rem;
}
.page-faq .faq-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.75rem;
  border-radius: 60px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: all var(--faq-transition);
  cursor: pointer;
  border: none;
}
.page-faq .faq-cta .btn-primary {
  background: var(--accent-green);
  color: #0D0D0D;
}
.page-faq .faq-cta .btn-primary:hover {
  background: #2ae00f;
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.3);
  transform: scale(1.03);
}

/* ============================================
   桌面端媒体查询 (min-width: 768px)
   ============================================ */
@media (min-width: 768px) {
  .page-faq {
    padding: 1.5rem 2rem 3rem;
  }
  .page-faq .breadcrumb {
    font-size: 0.8rem;
    margin-bottom: 2.5rem;
  }
  /* 首屏左右两列 */
  .page-faq .faq-hero {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
    margin-bottom: 4rem;
  }
  .page-faq .faq-hero-content {
    flex: 1 1 55%;
  }
  .page-faq .faq-hero .section-title {
    font-size: 2.8rem;
  }
  .page-faq .faq-hero-desc {
    font-size: 1.05rem;
  }
  .page-faq .faq-hero-visual {
    flex: 0 1 40%;
    justify-content: flex-end;
  }
  .page-faq .faq-hero-img {
    max-width: 100%;
    height: auto;
  }
  /* 标签 */
  .page-faq .faq-tabs {
    gap: 0.75rem;
    padding-bottom: 1rem;
    margin-bottom: 2.5rem;
  }
  .page-faq .faq-tab {
    font-size: 0.85rem;
    padding: 0.55rem 1.5rem;
  }
  /* 问题卡片 */
  .page-faq .faq-list {
    max-width: 760px;
  }
  .page-faq .faq-item-header {
    padding: 1.15rem 1.5rem;
    font-size: 1rem;
  }
  .page-faq .faq-item[data-expanded="true"] .faq-item-body {
    padding: 0 1.5rem 1.25rem;
  }
  .page-faq .faq-item-body {
    padding: 0 1.5rem;
    font-size: 0.9rem;
  }
  /* 功能配图 */
  .page-faq .faq-image-block {
    justify-content: flex-start;
    margin-top: 1rem;
  }
  /* 底部CTA */
  .page-faq .faq-cta-card {
    padding: 2.5rem 2rem;
  }
  .page-faq .faq-cta-title {
    font-size: 1.35rem;
  }
}

/* 更大桌面端 (min-width: 1024px) */
@media (min-width: 1024px) {
  .page-faq {
    padding: 2rem 3rem 4rem;
  }
  .page-faq .faq-hero .section-title {
    font-size: 3.2rem;
  }
  .page-faq .faq-hero-desc {
    font-size: 1.1rem;
  }
  .page-faq .faq-section-title {
    font-size: 1.5rem;
  }
  .page-faq .faq-list {
    max-width: 800px;
  }
}