/* ===== 页面专属：常见问题 (page-faq) ===== */
.page-faq {
  --faq-sidebar-width: 280px;
  --faq-section-gap: 2.5rem;
  --faq-item-radius: 6px;
  --faq-gold-line: 3px solid var(--color-accent-gold);
  display: block;
  width: 100%;
  min-height: 80vh;
  background: var(--color-bg-dark);
  color: var(--color-text-primary);
  font-family: var(--font-body);
}

/* ===== 布局容器 ===== */
.page-faq .faq-layout {
  display: flex;
  flex-direction: column;
  max-width: var(--content-max-width, 1200px);
  margin: 0 auto;
  min-height: inherit;
  position: relative;
}

/* ===== 左侧固定栏 ===== */
.page-faq .faq-sidebar {
  background: var(--color-bg-medium);
  border-bottom: 1px solid rgba(255, 215, 0, 0.15);
  order: -1;
  width: 100%;
  flex-shrink: 0;
}

.page-faq .faq-sidebar__inner {
  padding: 1.5rem 1.25rem;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow: hidden;
}

.page-faq .faq-sidebar__heading {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-gold);
  margin: 0 0 0.1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 215, 0, 0.2);
}

/* 搜索框 */
.page-faq .faq-search {
  position: relative;
  display: flex;
  align-items: center;
}

.page-faq .faq-search__input {
  width: 100%;
  padding: 0.6rem 0.8rem 0.6rem 2.2rem;
  background: rgba(10, 10, 10, 0.7);
  border: 1px solid rgba(255, 215, 0, 0.25);
  border-radius: var(--faq-item-radius);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 0.875rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  outline: none;
}

.page-faq .faq-search__input::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.7;
}

.page-faq .faq-search__input:focus {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 0 2px rgba(255, 215, 0, 0.15), 0 0 12px rgba(255, 215, 0, 0.05);
}

.page-faq .faq-search__icon {
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--color-accent-gold);
  pointer-events: none;
  opacity: 0.6;
  line-height: 1;
}

/* 导航链接 */
.page-faq .faq-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
}

.page-faq .faq-nav__link {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
  white-space: nowrap;
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus {
  color: var(--color-accent-gold);
  border-bottom-color: var(--color-accent-gold);
}

/* 侧边栏联系 */
.page-faq .faq-sidebar__contact {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 215, 0, 0.1);
}

.page-faq .faq-sidebar__contact-label {
  margin: 0 0 0.3rem;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}

.page-faq .faq-sidebar__contact-link {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent-gold);
  text-decoration: none;
  transition: opacity 0.25s ease;
}

.page-faq .faq-sidebar__contact-link:hover {
  opacity: 0.8;
}

/* 纹理装饰 */
.page-faq .faq-sidebar__texture {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 120px;
  height: auto;
  opacity: 0.06;
  pointer-events: none;
  object-fit: cover;
  max-width: 40%;
}

/* ===== 右侧内容区 ===== */
.page-faq .faq-main {
  flex: 1;
  padding: 1.5rem 1.25rem 3rem;
  min-width: 0;
}

/* 面包屑 */
.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-wrap: wrap;
}

.page-faq .breadcrumb__link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-faq .breadcrumb__link:hover {
  color: var(--color-accent-gold);
}

.page-faq .breadcrumb__sep {
  color: var(--color-text-secondary);
  opacity: 0.5;
  font-size: 1em;
}

.page-faq .breadcrumb__current {
  color: var(--color-accent-gold);
  font-weight: 500;
}

/* 标题区 */
.page-faq .faq-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-faq .faq-header__title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0;
  line-height: 1.1;
  color: var(--color-text-primary);
  background: linear-gradient(135deg, var(--color-text-primary) 40%, var(--color-accent-gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-faq .faq-header__icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  opacity: 0.7;
  object-fit: contain;
  filter: drop-shadow(0 0 6px rgba(255, 215, 0, 0.2));
}

/* ===== 问题分区 ===== */
.page-faq .faq-section {
  margin-bottom: var(--faq-section-gap);
  padding: 1.6rem 1.25rem;
  border-radius: 8px;
  background: rgba(26, 26, 26, 0.5);
  border-left: 3px solid var(--color-accent-gold);
  transition: background 0.3s ease;
}

.page-faq .faq-section:nth-child(2) { /* 资料索引 */
  border-left-color: var(--color-primary-light);
  background: rgba(26, 26, 26, 0.4);
}

.page-faq .faq-section:nth-child(3) { /* 旧版本资料 */
  border-left-color: var(--color-accent-neon);
  background: rgba(10, 10, 10, 0.6);
}

.page-faq .faq-section:nth-child(4) { /* 其他问题 */
  border-left-color: var(--color-accent-gold-light);
  background: rgba(26, 26, 26, 0.35);
}

.page-faq .faq-section__heading {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 1rem;
  color: var(--color-accent-gold);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.page-faq .faq-section__heading::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 2px;
  background: var(--color-accent-gold);
  flex-shrink: 0;
}

.page-faq .faq-section__body {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* ===== 折叠面板 ===== */
.page-faq .faq-item {
  background: rgba(10, 10, 10, 0.5);
  border-radius: var(--faq-item-radius);
  border: 1px solid rgba(255, 215, 0, 0.08);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-faq .faq-item:hover {
  border-color: rgba(255, 215, 0, 0.2);
}

.page-faq .faq-item[open] {
  border-color: rgba(255, 215, 0, 0.25);
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.03);
}

.page-faq .faq-item__question {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  padding: 0.85rem 1rem 0.85rem 2.6rem;
  cursor: pointer;
  list-style: none;
  position: relative;
  user-select: none;
  transition: color 0.25s ease, background 0.25s ease;
  line-height: 1.4;
}

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

.page-faq .faq-item__question::marker {
  display: none;
  content: '';
}

/* 自定义金色加号/减号 */
.page-faq .faq-item__question::before {
  content: '+';
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-tech);
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--color-accent-gold);
  line-height: 1;
  transition: transform 0.35s ease, color 0.25s ease;
  opacity: 0.8;
}

.page-faq .faq-item[open] > .faq-item__question::before {
  transform: translateY(-50%) rotate(45deg);
  color: var(--color-primary-light);
}

.page-faq .faq-item__question:hover {
  color: var(--color-accent-gold);
  background: rgba(255, 215, 0, 0.02);
}

.page-faq .faq-item[open] > .faq-item__question {
  color: var(--color-accent-gold);
  border-bottom: 1px solid rgba(255, 215, 0, 0.1);
}

/* 答案区 */
.page-faq .faq-item__answer {
  padding: 0.8rem 1rem 1rem 2.6rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  background: rgba(10, 10, 10, 0.3);
}

.page-faq .faq-item__answer p {
  margin: 0 0 0.5rem;
}

.page-faq .faq-item__answer p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__answer a {
  color: var(--color-accent-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 215, 0, 0.2);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-faq .faq-item__answer a:hover {
  color: var(--color-accent-gold-light);
  border-bottom-color: var(--color-accent-gold-light);
}

/* ===== 响应式：桌面端 ≥768px ===== */
@media (width >= 768px) {
  .page-faq .faq-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-faq .faq-sidebar {
    width: var(--faq-sidebar-width);
    flex-shrink: 0;
    border-bottom: none;
    border-right: 1px solid rgba(255, 215, 0, 0.12);
    min-height: 80vh;
    order: 0;
  }

  .page-faq .faq-sidebar__inner {
    position: sticky;
    top: var(--header-height, 60px);
    padding: 2rem 1.5rem;
    height: calc(100vh - var(--header-height, 60px));
    justify-content: flex-start;
    gap: 1.5rem;
  }

  .page-faq .faq-sidebar__heading {
    font-size: 0.75rem;
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    gap: 0.35rem;
  }

  .page-faq .faq-nav__link {
    font-size: 0.8rem;
    white-space: normal;
    padding: 0.3rem 0;
  }

  .page-faq .faq-sidebar__contact {
    margin-top: 0;
  }

  .page-faq .faq-sidebar__texture {
    width: 180px;
    max-width: 60%;
  }

  .page-faq .faq-main {
    padding: 2rem 2.5rem 4rem;
  }

  .page-faq .faq-header__title {
    font-size: 2.8rem;
  }

  .page-faq .faq-header__icon {
    width: 56px;
    height: 56px;
  }

  .page-faq .faq-section {
    padding: 2rem 2rem;
  }

  .page-faq .faq-section__heading {
    font-size: 1.15rem;
  }

  .page-faq .faq-item__question {
    font-size: 0.95rem;
    padding: 1rem 1rem 1rem 2.8rem;
  }

  .page-faq .faq-item__question::before {
    left: 1rem;
    font-size: 1.4rem;
  }

  .page-faq .faq-item__answer {
    padding: 0.9rem 1rem 1.1rem 2.8rem;
    font-size: 0.9rem;
  }
}

/* ===== 大桌面端 ≥1024px ===== */
@media (width >= 1024px) {
  .page-faq .faq-sidebar {
    width: 300px;
  }

  .page-faq .faq-sidebar__inner {
    padding: 2.5rem 2rem;
  }

  .page-faq .faq-main {
    padding: 2.5rem 3.5rem 5rem;
  }

  .page-faq .faq-header__title {
    font-size: 3.2rem;
  }

  .page-faq .faq-section {
    padding: 2.2rem 2.5rem;
    margin-bottom: 2.8rem;
  }
}

/* ===== 过滤高亮（配合 data-filter，JS 增强） ===== */
.page-faq .faq-item.is-hidden {
  display: none;
}

.page-faq .faq-item.is-highlighted {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 0 1px rgba(255, 215, 0, 0.15), 0 0 20px rgba(255, 215, 0, 0.05);
}

/* ===== 滚动与焦点 ===== */
.page-faq .faq-section:target {
  scroll-margin-top: calc(var(--header-height, 60px) + 1rem);
  animation: faq-section-pulse 2s ease;
}

@keyframes faq-section-pulse {
  0%, 100% { box-shadow: none; }
  50% { box-shadow: 0 0 0 2px rgba(255, 215, 0, 0.08); }
}

/* ===== 打印样式 ===== */
@media print {
  .page-faq {
    background: #fff;
    color: #111;
  }
  .page-faq .faq-sidebar {
    display: none;
  }
  .page-faq .faq-item__answer {
    background: none;
  }
  .page-faq .faq-header__title {
    -webkit-text-fill-color: #111;
    background: none;
    color: #111;
  }
}

/* ===== 极窄屏安全 ===== */
@media (width < 400px) {
  .page-faq .faq-header {
    flex-wrap: wrap;
  }
  .page-faq .faq-header__title {
    font-size: 1.6rem;
  }
  .page-faq .faq-sidebar__inner {
    padding: 1rem 0.8rem;
  }
  .page-faq .faq-section {
    padding: 1rem 0.8rem;
  }
  .page-faq .faq-item__question {
    font-size: 0.82rem;
    padding: 0.7rem 0.7rem 0.7rem 2.2rem;
  }
  .page-faq .faq-item__question::before {
    left: 0.6rem;
    font-size: 1.1rem;
  }
  .page-faq .faq-item__answer {
    padding: 0.6rem 0.7rem 0.8rem 2.2rem;
  }
}