/* ===== 页面专属：问答中心 .page-faq ===== */
.page-faq {
  --faq-spacing: 2rem;
  --faq-toc-width: 180px;
  --faq-icon-size: 20px;
  --faq-border-color: var(--color-border);
  --faq-text-color: var(--color-text);
  --faq-heading-color: var(--color-text-white);
  --faq-accent: var(--color-accent);
  --faq-gold: var(--color-gold);
  --faq-bg-card: var(--color-bg-secondary);
  --faq-transition: 0.35s ease;
  padding: clamp(1.5rem, 5vw, 3rem) clamp(1rem, 4vw, 2.5rem);
  max-width: 1080px;
  margin: 0 auto;
  background-color: var(--color-bg);
  color: var(--faq-text-color);
  font-family: var(--font-heading);
}

/* 标题区 */
.page-faq .faq-hero {
  margin-bottom: var(--faq-spacing);
  position: relative;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--faq-border-color);
}

.page-faq .faq-hero-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 900;
  font-stretch: 105%;
  letter-spacing: -0.02em;
  color: var(--faq-heading-color);
  margin: 0 0 0.4rem 0;
  text-transform: uppercase;
}

.page-faq .faq-hero-desc {
  font-size: 0.95rem;
  color: var(--faq-text-color);
  line-height: 1.6;
  max-width: 640px;
  margin: 0;
}

/* 网格：左侧目录 + 右侧正文 */
.page-faq .faq-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--faq-spacing);
  align-items: flex-start;
}

.page-faq .faq-toc {
  flex: 0 0 var(--faq-toc-width);
  position: sticky;
  top: 2rem;
  align-self: flex-start;
  background: var(--faq-bg-card);
  padding: 1.2rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--faq-border-color);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-toc-link {
  display: block;
  padding: 0.5rem 0.3rem;
  color: var(--faq-text-color);
  text-decoration: none;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--color-border-light);
  transition: color var(--faq-transition), padding-left var(--faq-transition);
  position: relative;
}

.page-faq .faq-toc-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--faq-gold);
  transition: height var(--faq-transition);
}

.page-faq .faq-toc-link:hover,
.page-faq .faq-toc-link:focus-visible {
  color: var(--faq-accent);
  padding-left: 0.6rem;
}

.page-faq .faq-toc-link:hover::before,
.page-faq .faq-toc-link:focus-visible::before {
  height: 60%;
}

/* 内容区 */
.page-faq .faq-content {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--faq-spacing);
}

/* 章节 */
.page-faq .faq-section {
  padding: 0;
  margin: 0;
  border: none;
  scroll-margin-top: 3rem;
}

.page-faq .faq-section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--faq-heading-color);
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 1px solid var(--faq-border-color);
  padding-bottom: 0.4rem;
}

.page-faq .faq-section-title .mono {
  font-size: 1rem;
  font-family: var(--font-mono);
  color: var(--faq-gold);
}

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

.page-faq details.faq-item {
  background: var(--faq-bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--faq-border-color);
  overflow: hidden;
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
}

.page-faq details.faq-item[open] {
  border-color: var(--faq-accent);
  box-shadow: 0 0 0 1px var(--faq-accent);
}

.page-faq .faq-question {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-weight: 500;
  color: var(--faq-heading-color);
  transition: background var(--faq-transition);
  position: relative;
}

.page-faq .faq-question::-webkit-details-marker {
  display: none;
}

.page-faq .faq-question::after {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-left: auto;
  border-right: 2px solid var(--faq-accent);
  border-bottom: 2px solid var(--faq-accent);
  transform: rotate(45deg);
  transition: transform var(--faq-transition), border-color var(--faq-transition);
  flex-shrink: 0;
}

.page-faq details.faq-item[open] .faq-question::after {
  transform: rotate(-135deg);
  border-color: var(--faq-gold);
}

.page-faq .faq-question:hover,
.page-faq .faq-question:focus-visible {
  background: rgba(57, 255, 20, 0.05);
}

.page-faq .faq-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--faq-icon-size);
  height: var(--faq-icon-size);
  flex-shrink: 0;
}

.page-faq .faq-question-text {
  flex: 1 1 0;
  font-size: 0.95rem;
  line-height: 1.4;
}

/* 答案区 */
.page-faq .faq-answer {
  padding: 0 1rem 1rem 2.8rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--faq-text-color);
  animation: faqFadeIn 0.3s ease;
}

.page-faq .faq-link {
  color: var(--faq-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--faq-transition);
}

.page-faq .faq-link:hover,
.page-faq .faq-link:focus-visible {
  color: var(--faq-gold);
}

/* 底部装饰图 */
.page-faq .faq-foot-art {
  margin-top: var(--faq-spacing);
  text-align: center;
}

.page-faq .faq-decor-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  opacity: 0.7;
  border: 1px solid var(--faq-border-color);
}

/* 颜色与辅助类复用 */
.page-faq .text-gold {
  color: var(--faq-gold);
}

.page-faq .mono {
  font-family: var(--font-mono);
}

/* 淡入动画 */
@keyframes faqFadeIn {
  0% { opacity: 0; transform: translateY(-4px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ===== 移动端优先 (窄屏 ≤ 720px) ===== */
@media (max-width: 720px) {
  .page-faq {
    padding: 1rem 0.75rem;
  }

  .page-faq .faq-grid {
    flex-direction: column;
  }

  .page-faq .faq-toc {
    flex: unset;
    width: 100%;
    position: static;
    top: auto;
    padding: 0.8rem 0.75rem;
  }

  .page-faq .faq-toc-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem 0.5rem;
  }

  .page-faq .faq-toc-link {
    padding: 0.3rem 0.2rem;
    border-bottom: none;
    font-size: 0.8rem;
  }

  .page-faq .faq-toc-link::before {
    display: none;
  }

  .page-faq .faq-content {
    gap: 1rem;
  }

  .page-faq .faq-question {
    padding: 0.7rem 0.75rem;
  }

  .page-faq .faq-answer {
    padding: 0 0.75rem 0.75rem 2.2rem;
  }

  .page-faq .faq-section-title {
    font-size: 1.1rem;
  }

  .page-faq .faq-foot-art {
    margin-top: 1rem;
  }
}

/* ===== 宽屏补充 (> 720px) ===== */
@media (min-width: 721px) {
  .page-faq .faq-toc {
    margin-right: var(--faq-spacing);
  }
}