/* ===== FAQ 页面专属样式 ===== */
.page-faq {
  --faq-nav-height: 56px;
  --faq-card-radius: 12px;
  --faq-card-padding: 1.5rem 1.75rem;
  --faq-accent-clr: var(--clr-primary-orange);
  --faq-bg-gradient: linear-gradient(180deg, var(--clr-bg-light) 0%, rgba(255,255,255,0.85) 100%);
}

/* 整体背景 */
.page-faq .faq-article {
  background: var(--faq-bg-gradient);
  min-height: 60vh;
  padding-top: 0;
}

/* 面包屑 */
.page-faq .faq-breadcrumb {
  padding-top: 1rem;
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  letter-spacing: 0.02em;
}
.page-faq .faq-breadcrumb a {
  color: var(--clr-primary-blue);
  text-decoration: none;
  transition: color 0.2s;
}
.page-faq .faq-breadcrumb a:hover,
.page-faq .faq-breadcrumb a:focus {
  color: var(--faq-accent-clr);
  outline: none;
}
.page-faq .faq-breadcrumb .sep {
  margin: 0 0.4rem;
  color: var(--clr-border-light);
}

/* 标题区 */
.page-faq .faq-article-header {
  padding: 3rem 0 2rem;
}
.page-faq .faq-main-title {
  font-family: var(--font-headings);
  font-size: clamp(2.6rem, 8vw, 4.5rem);
  line-height: 1.1;
  color: var(--clr-text-primary);
  margin: 0.5rem 0 0.25rem;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.page-faq .faq-subtitle {
  font-size: 1.1rem;
  color: var(--clr-text-secondary);
  margin-top: 0.25rem;
  font-weight: 400;
  letter-spacing: 0.03em;
}

/* 吸顶导航 */
.page-faq .faq-sticky-nav {
  position: sticky;
  top: var(--nav-height);
  z-index: 20;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border-light);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s;
}
.page-faq .faq-sticky-nav.scrolled {
  box-shadow: var(--shadow-md);
}
.page-faq .faq-nav-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  padding: 0.75rem 0;
  align-items: center;
  justify-content: center;
}
.page-faq .faq-nav-link {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-primary);
  text-decoration: none;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s, color 0.25s;
  white-space: nowrap;
}
.page-faq .faq-nav-link:hover,
.page-faq .faq-nav-link:focus {
  color: var(--faq-accent-clr);
  border-bottom-color: var(--faq-accent-clr);
  outline: none;
}
.page-faq .faq-nav-link:focus-visible {
  outline: 2px solid var(--faq-accent-clr);
  outline-offset: 4px;
  border-radius: 4px;
}

/* 章节 */
.page-faq .faq-chapter {
  padding-top: 3.5rem;
  margin-top: 0;
}
.page-faq .faq-chapter-heading {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--clr-border-light);
  padding-bottom: 0.75rem;
}
.page-faq .faq-chapter .section-number {
  font-family: var(--font-headings);
  font-size: 2.8rem;
  line-height: 1;
  color: var(--faq-accent-clr);
  opacity: 0.6;
  flex-shrink: 0;
}
.page-faq .faq-chapter-title {
  font-family: var(--font-headings);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  color: var(--clr-primary-blue);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

/* 问答卡片列表 */
.page-faq .faq-card-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* 单个问答卡片 (details) */
.page-faq .faq-card {
  background: var(--clr-card-bg);
  border: 1px solid var(--clr-border-light);
  border-radius: var(--faq-card-radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.3s, border-color 0.3s;
}
.page-faq .faq-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(255,111,0,0.25);
}
.page-faq .faq-card[open] {
  border-color: rgba(255,111,0,0.35);
  box-shadow: var(--shadow-md);
}

/* summary 问题行 */
.page-faq .faq-question {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: var(--faq-card-padding);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--clr-text-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: background 0.2s;
  position: relative;
}
.page-faq .faq-question::-webkit-details-marker {
  display: none;
}
.page-faq .faq-question:hover,
.page-faq .faq-question:focus {
  background: rgba(255,111,0,0.04);
}
.page-faq .faq-question:focus-visible {
  outline: 2px solid var(--faq-accent-clr);
  outline-offset: -2px;
  border-radius: var(--faq-card-radius) var(--faq-card-radius) 0 0;
}

/* 图标 */
.page-faq .faq-q-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: var(--faq-accent-clr);
  opacity: 0.7;
  transition: opacity 0.2s;
}
.page-faq .faq-card[open] .faq-q-icon {
  opacity: 1;
}
.page-faq .faq-q-icon svg {
  width: 24px;
  height: 24px;
  display: block;
}

/* 展开/折叠标记 */
.page-faq .faq-toggle-mark {
  margin-left: auto;
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  position: relative;
  transition: transform 0.3s ease;
}
.page-faq .faq-toggle-mark::before,
.page-faq .faq-toggle-mark::after {
  content: '';
  position: absolute;
  background: var(--clr-primary-blue);
  border-radius: 2px;
  transition: transform 0.3s ease;
}
.page-faq .faq-toggle-mark::before {
  width: 2px;
  height: 12px;
  top: 0;
  left: 5px;
}
.page-faq .faq-toggle-mark::after {
  width: 12px;
  height: 2px;
  top: 5px;
  left: 0;
}
.page-faq .faq-card[open] .faq-toggle-mark {
  transform: rotate(45deg);
}
.page-faq .faq-card[open] .faq-toggle-mark::before {
  transform: scaleY(0);
}

/* 问题文本 */
.page-faq .faq-q-text {
  flex: 1;
  line-height: 1.4;
}

/* 答案区域 */
.page-faq .faq-answer {
  padding: 0 1.75rem 1.5rem;
  color: var(--clr-text-secondary);
  line-height: 1.7;
  font-size: 0.975rem;
  border-top: 1px solid var(--clr-border-light);
  animation: faq-fadeIn 0.35s ease;
}
.page-faq .faq-answer p {
  margin: 0.75rem 0;
}
.page-faq .faq-answer p:first-child {
  margin-top: 1rem;
}
@keyframes faq-fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 步骤示意图 */
.page-faq .faq-step-img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin: 1rem 0 0.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--clr-border-light);
  object-fit: cover;
}

/* 联系方式列表 */
.page-faq .faq-contact-list {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0;
}
.page-faq .faq-contact-list li {
  padding: 0.35rem 0;
  padding-left: 1.2em;
  position: relative;
  font-family: var(--font-body);
}
.page-faq .faq-contact-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--faq-accent-clr);
  font-weight: 700;
}
.page-faq .faq-answer a {
  color: var(--clr-primary-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}
.page-faq .faq-answer a:hover,
.page-faq .faq-answer a:focus {
  color: var(--faq-accent-clr);
}

/* 文章底部 */
.page-faq .faq-article-footer {
  padding: 3rem 0 4rem;
  text-align: center;
}
.page-faq .faq-footer-text {
  font-size: 1.05rem;
  color: var(--clr-text-secondary);
}
.page-faq .faq-footer-text a {
  color: var(--clr-primary-blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}
.page-faq .faq-footer-text a:hover,
.page-faq .faq-footer-text a:focus {
  color: var(--faq-accent-clr);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .page-faq .faq-article-header {
    padding: 1.5rem 0 1rem;
  }
  .page-faq .faq-main-title {
    font-size: clamp(2rem, 10vw, 3rem);
  }
  .page-faq .faq-subtitle {
    font-size: 0.95rem;
  }
  .page-faq .faq-sticky-nav {
    top: 60px; /* 适配更小的导航高度 */
  }
  .page-faq .faq-nav-inner {
    gap: 0.3rem 0.75rem;
    padding: 0.5rem 0;
    justify-content: flex-start;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .page-faq .faq-nav-inner::-webkit-scrollbar {
    display: none;
  }
  .page-faq .faq-nav-link {
    font-size: 0.8rem;
    white-space: nowrap;
    flex-shrink: 0;
  }
  .page-faq .faq-chapter {
    padding-top: 2.5rem;
  }
  .page-faq .faq-chapter .section-number {
    font-size: 2rem;
  }
  .page-faq .faq-chapter-title {
    font-size: clamp(1.3rem, 5vw, 1.8rem);
  }
  .page-faq .faq-question {
    padding: 1rem 1.25rem;
    font-size: 0.95rem;
    gap: 0.65rem;
  }
  .page-faq .faq-q-icon {
    width: 24px;
    height: 24px;
  }
  .page-faq .faq-q-icon svg {
    width: 20px;
    height: 20px;
  }
  .page-faq .faq-answer {
    padding: 0 1.25rem 1.25rem;
    font-size: 0.9rem;
  }
  .page-faq .faq-step-img {
    border-radius: 6px;
  }
  .page-faq .faq-article-footer {
    padding: 2rem 0 3rem;
  }
  .page-faq .faq-footer-text {
    font-size: 0.95rem;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-nav-inner {
    gap: 1.5rem 2rem;
  }
  .page-faq .faq-nav-link {
    font-size: 1rem;
  }
  .page-faq .faq-chapter-heading {
    margin-bottom: 2.5rem;
  }
  .page-faq .faq-card-list {
    gap: 1rem;
  }
}