/* ===== 页面专属 CSS：.page-faq ===== */
.page-faq {
  --faq-accent-bar: 4px;
  --faq-tab-radius: 6px;
  --faq-card-clip: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  --faq-copy-bg: rgba(0, 255, 135, 0.08);
  --faq-copy-hover: rgba(0, 255, 135, 0.18);
  --faq-sidebar-width: 300px;
  --faq-gap: 2rem;
  display: block;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  padding: 1.5rem 0 3rem;
}

/* 容器 */
.page-faq .container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-bottom: 1.2rem;
}
.page-faq .breadcrumb-item {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.page-faq .breadcrumb-item:hover {
  color: var(--color-accent);
}
.page-faq .breadcrumb-item[aria-current="page"] {
  color: var(--color-text);
  font-weight: 600;
}
.page-faq .breadcrumb-sep {
  color: var(--color-border-light);
  font-size: 0.75rem;
}

/* 标题区 */
.page-faq .faq-header {
  margin-bottom: 1.8rem;
  border-left: var(--faq-accent-bar) solid var(--color-accent);
  padding-left: 1.2rem;
}
.page-faq .faq-headline {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.02em;
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-faq .faq-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0;
  line-height: 1.5;
}

/* 分类标签导航 */
.page-faq .faq-tabs {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
  padding-bottom: 0.3rem;
}
.page-faq .faq-tabs::-webkit-scrollbar {
  height: 4px;
}
.page-faq .faq-tabs::-webkit-scrollbar-thumb {
  background-color: var(--color-border);
  border-radius: 4px;
}
.page-faq .faq-tab {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  text-decoration: none;
  border: 1px solid var(--color-border);
  clip-path: var(--faq-card-clip);
  transition: all 0.25s ease;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.page-faq .faq-tab:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
  box-shadow: var(--glow-accent);
}
/* 当前section在视口中时高亮对应标签（:target 配合） */
.page-faq .faq-tab:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 两栏布局 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  align-items: start;
}

/* 主内容区 */
.page-faq .faq-main {
  display: flex;
  flex-direction: column;
  gap: 2.8rem;
}

/* 每个分区 */
.page-faq .faq-section {
  scroll-margin-top: 2rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border);
  transition: border-color 0.3s;
}
.page-faq .faq-section:target {
  border-top-color: var(--color-accent);
  animation: faqSectionFlash 0.6s ease;
}
@keyframes faqSectionFlash {
  0% { background-color: var(--color-accent-dim); }
  100% { background-color: transparent; }
}

.page-faq .section-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}
.page-faq .section-number {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--color-accent2);
  line-height: 1;
  opacity: 0.7;
}
.page-faq .section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 700;
  margin: 0;
  color: var(--color-text);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}
.page-faq .section-desc {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  margin: 0 0 1.2rem;
  max-width: 600px;
}

/* 图片 */
.page-faq .faq-figure {
  margin: 0 0 1.4rem;
  max-width: 600px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  clip-path: var(--faq-card-clip);
}
.page-faq .faq-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: attr(width) / attr(height);
}
.page-faq .faq-figcap {
  font-size: 0.78rem;
  color: var(--color-text-dim);
  padding: 0.4rem 0.8rem 0.6rem;
  background: var(--color-surface);
}

/* 手风琴列表 */
.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* 手风琴项 */
.page-faq .faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: var(--faq-accent-bar) solid transparent;
  clip-path: var(--faq-card-clip);
  transition: border-color 0.3s, background 0.3s;
  overflow: hidden;
}
.page-faq .faq-item[open] {
  border-left-color: var(--color-accent);
  background: rgba(17, 34, 64, 0.85);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.25);
}
.page-faq .faq-item:hover {
  border-color: var(--color-border-light);
}

.page-faq .faq-question {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1rem 0.9rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color 0.2s;
  position: relative;
}
.page-faq .faq-question::-webkit-details-marker {
  display: none;
}
.page-faq .faq-question::before {
  content: "›";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.2em;
  height: 1.2em;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-accent);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  line-height: 1;
}
.page-faq .faq-item[open] > .faq-question::before {
  transform: rotate(90deg);
}
.page-faq .faq-question:hover {
  color: var(--color-accent);
}
.page-faq .faq-question:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

/* 答案区域 */
.page-faq .faq-answer {
  padding: 0 1.2rem 1rem 2.4rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  animation: faqAnswerFade 0.3s ease;
}
@keyframes faqAnswerFade {
  from { opacity: 0.4; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
.page-faq .faq-answer p {
  margin: 0 0 0.6rem;
}
.page-faq .faq-answer a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}
.page-faq .faq-answer a:hover {
  color: var(--color-accent2);
}

/* 复制按钮 */
.page-faq .faq-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.7rem;
  font-size: 0.75rem;
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--color-accent);
  background: var(--faq-copy-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  clip-path: var(--faq-card-clip);
}
.page-faq .faq-copy::before {
  content: "📋";
  font-size: 0.7rem;
}
.page-faq .faq-copy:hover {
  background: var(--faq-copy-hover);
  border-color: var(--color-accent);
  box-shadow: var(--glow-accent);
  color: var(--color-text);
}
.page-faq .faq-copy:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ===== 侧边栏 ===== */
.page-faq .faq-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.page-faq .sidebar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  clip-path: var(--faq-card-clip);
  padding: 1.2rem 1.2rem 1.4rem;
  transition: border-color 0.3s;
}
.page-faq .sidebar-card:hover {
  border-color: var(--color-border-light);
}
.page-faq .sidebar-card--accent {
  border-left: 3px solid var(--color-accent2);
}
.page-faq .sidebar-card-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.8rem;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.page-faq .sidebar-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.page-faq .sidebar-link {
  display: block;
  padding: 0.4rem 0;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--color-border);
  transition: all 0.2s;
}
.page-faq .sidebar-link:hover {
  color: var(--color-accent);
  padding-left: 0.4rem;
  border-bottom-color: var(--color-accent-dim);
}
.page-faq .sidebar-contact-list {
  list-style: none;
  margin: 0 0 0.6rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
}
.page-faq .sidebar-contact-list li {
  display: flex;
  gap: 0.4rem;
  align-items: baseline;
}
.page-faq .contact-label {
  font-weight: 600;
  color: var(--color-text-dim);
  min-width: 2.4em;
}
.page-faq .sidebar-contact-list a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}
.page-faq .sidebar-contact-list a:hover {
  color: var(--color-accent2);
}
.page-faq .sidebar-note {
  font-size: 0.78rem;
  color: var(--color-text-dim);
  margin: 0;
  line-height: 1.5;
}

/* ===== 响应式：桌面 ≥ 768px ===== */
@media (min-width: 768px) {
  .page-faq {
    padding: 2rem 0 4rem;
  }
  .page-faq .container {
    padding: 0 1.5rem;
  }
  .page-faq .faq-header {
    margin-bottom: 2.2rem;
    padding-left: 1.6rem;
  }
  .page-faq .faq-headline {
    font-size: clamp(2.4rem, 5vw, 3.8rem);
  }
  .page-faq .faq-subtitle {
    font-size: 1.05rem;
  }
  .page-faq .faq-tabs {
    gap: 0.8rem;
    margin-bottom: 2.4rem;
  }
  .page-faq .faq-tab {
    padding: 0.55rem 1.5rem;
    font-size: 0.9rem;
  }
  .page-faq .faq-layout {
    grid-template-columns: 1fr var(--faq-sidebar-width);
    gap: 2.5rem;
  }
  .page-faq .faq-main {
    gap: 3.2rem;
  }
  .page-faq .section-number {
    font-size: 1.8rem;
  }
  .page-faq .section-title {
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  }
  .page-faq .faq-question {
    padding: 1rem 1.2rem 1rem 1.6rem;
    font-size: 1rem;
  }
  .page-faq .faq-answer {
    font-size: 0.92rem;
  }
  .page-faq .sidebar-card {
    padding: 1.4rem 1.4rem 1.6rem;
  }
}

/* ===== 大桌面 ≥ 1024px ===== */
@media (min-width: 1024px) {
  .page-faq .container {
    padding: 0 2rem;
  }
  .page-faq .faq-layout {
    gap: 3rem;
  }
  .page-faq .faq-sidebar {
    position: sticky;
    top: calc(var(--header-top-height, 60px) + var(--ticker-height, 36px) + 1rem);
  }
  .page-faq .faq-tabs {
    gap: 1rem;
  }
  .page-faq .faq-tab {
    font-size: 0.95rem;
    padding: 0.6rem 1.8rem;
  }
}

/* 微调：窄屏时避免文字溢出 */
@media (max-width: 380px) {
  .page-faq .faq-question {
    font-size: 0.85rem;
    padding: 0.7rem 0.8rem 0.7rem 1rem;
  }
  .page-faq .faq-answer {
    padding: 0 0.8rem 0.8rem 1.6rem;
    font-size: 0.82rem;
  }
  .page-faq .faq-headline {
    font-size: 1.7rem;
  }
  .page-faq .faq-tab {
    font-size: 0.78rem;
    padding: 0.4rem 0.8rem;
  }
}