/* ===== 页面专属：问答中心（.page-faq） ===== */
.page-faq {
  --faq-sidebar-width: 280px;
  --faq-panel-bg: #1a4a3a;
  --faq-panel-text: #ffffff;
  --faq-panel-accent: #d4a843;
  --faq-border-radius: 16px;
  --faq-item-radius: 12px;
  --faq-transition: 0.3s ease;
  max-width: var(--max-width, 1440px);
  margin: 0 auto;
  padding: 0 16px 40px;
  font-family: var(--font-body, 'Noto Sans SC', 'PingFang SC', sans-serif);
  color: var(--c-text, #1a1a1a);
  background: var(--c-bg, #ffffff);
}
/* 面包屑 */
.page-faq__breadcrumb {
  padding: 16px 0 8px;
  font-size: 0.85rem;
  font-family: var(--font-mono, 'DM Mono', 'JetBrains Mono', monospace);
  color: var(--c-text-secondary, #4a4a4a);
  border-bottom: 1px solid var(--c-border, #b3b3b3);
  margin-bottom: 24px;
}
.page-faq__breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.page-faq__breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-faq__breadcrumb li + li::before {
  content: "/";
  color: var(--c-border, #b3b3b3);
  font-weight: 300;
}
.page-faq__breadcrumb a {
  color: var(--c-brand, #1a4a3a);
  text-decoration: none;
  transition: color var(--faq-transition);
}
.page-faq__breadcrumb a:hover {
  color: var(--faq-panel-accent, #d4a843);
}
.page-faq__breadcrumb [aria-current="page"] {
  color: var(--c-text-secondary, #4a4a4a);
  pointer-events: none;
}
/* 左右布局 */
.page-faq__layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
/* 左侧控制台 */
.page-faq__sidebar {
  flex-shrink: 0;
}
.page-faq__panel {
  background: var(--faq-panel-bg);
  color: var(--faq-panel-text);
  border-radius: var(--faq-border-radius);
  padding: 24px 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  position: relative;
  overflow: hidden;
}
.page-faq__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--faq-panel-accent);
}
.page-faq__panel-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.page-faq__panel-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
}
.page-faq__panel-title {
  font-family: var(--font-mono, 'DM Mono', 'JetBrains Mono', monospace);
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0;
  letter-spacing: 0.02em;
}
/* 搜索 */
.page-faq__search {
  margin-bottom: 20px;
}
.page-faq__search-input {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-capsule, 999px);
  background: rgba(255,255,255,0.1);
  color: var(--faq-panel-text);
  font-family: var(--font-body, 'Noto Sans SC', 'PingFang SC', sans-serif);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--faq-transition), background var(--faq-transition);
  box-sizing: border-box;
}
.page-faq__search-input::placeholder {
  color: rgba(255,255,255,0.5);
}
.page-faq__search-input:focus {
  border-color: var(--faq-panel-accent);
  background: rgba(255,255,255,0.15);
}
/* 分类标签 */
.page-faq__filters {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-faq__filter {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 16px;
  border: 2px solid transparent;
  border-radius: var(--radius-capsule, 999px);
  background: rgba(255,255,255,0.08);
  color: var(--faq-panel-text);
  font-family: var(--font-mono, 'DM Mono', 'JetBrains Mono', monospace);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--faq-transition), border-color var(--faq-transition), transform 0.2s;
  text-align: left;
  box-sizing: border-box;
}
.page-faq__filter:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.2);
  transform: translateX(2px);
}
.page-faq__filter.active {
  background: var(--faq-panel-accent);
  color: var(--faq-panel-bg);
  border-color: var(--faq-panel-accent);
  font-weight: 700;
}
.page-faq__filter.active .page-faq__filter-icon {
  filter: brightness(0.8);
}
.page-faq__filter-icon {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
}
/* 右侧内容区 */
.page-faq__content {
  flex: 1;
  min-width: 0;
}
.page-faq__heading {
  font-family: var(--font-mono, 'DM Mono', 'JetBrains Mono', monospace);
  font-weight: 700;
  font-size: clamp(1.8rem, 3vw, 3rem);
  color: var(--c-text, #1a1a1a);
  margin: 0 0 8px;
  line-height: 1.2;
}
.page-faq__subtitle {
  font-size: 1rem;
  color: var(--c-text-secondary, #4a4a4a);
  margin: 0 0 28px;
  line-height: 1.6;
  max-width: 640px;
}
/* 问答列表 */
.page-faq__items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
/* 单个问答折叠面板 */
.page-faq__item {
  border: 1px solid var(--c-border, #b3b3b3);
  border-radius: var(--faq-item-radius);
  background: var(--c-bg-light, #f2f2f2);
  overflow: hidden;
  transition: box-shadow var(--faq-transition), border-color var(--faq-transition);
  border-left: 4px solid transparent;
}
.page-faq__item[open] {
  border-left-color: var(--c-brand, #1a4a3a);
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  border-color: var(--c-brand, #1a4a3a);
}
.page-faq__item summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  font-family: var(--font-body, 'Noto Sans SC', 'PingFang SC', sans-serif);
  font-weight: 600;
  font-size: 1rem;
  color: var(--c-text, #1a1a1a);
  cursor: pointer;
  list-style: none;
  transition: background var(--faq-transition);
  user-select: none;
}
.page-faq__item summary::-webkit-details-marker {
  display: none;
}
.page-faq__item summary:hover {
  background: rgba(0,0,0,0.02);
}
.page-faq__item summary::after {
  content: "";
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--c-brand, #1a4a3a);
  border-bottom: 2px solid var(--c-brand, #1a4a3a);
  transform: rotate(45deg);
  margin-left: auto;
  flex-shrink: 0;
  transition: transform var(--faq-transition);
  opacity: 0.6;
}
.page-faq__item[open] summary::after {
  transform: rotate(-135deg);
  opacity: 1;
}
.page-faq__q-marker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-brand, #1a4a3a);
  color: #fff;
  font-family: var(--font-mono, 'DM Mono', 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.page-faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  padding: 0 20px;
}
.page-faq__item[open] .page-faq__answer {
  max-height: 600px;
  opacity: 1;
  padding: 0 20px 20px;
}
.page-faq__answer p {
  margin: 0 0 8px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--c-text-secondary, #4a4a4a);
}
.page-faq__answer a {
  color: var(--c-brand, #1a4a3a);
  text-decoration: underline;
  transition: color var(--faq-transition);
}
.page-faq__answer a:hover {
  color: var(--faq-panel-accent, #d4a843);
}
.page-faq__answer p:last-child {
  margin-bottom: 0;
}
/* 联系支持区域 */
.page-faq__support {
  margin-top: 40px;
  border-radius: var(--faq-border-radius);
  overflow: hidden;
  background: var(--faq-panel-bg);
  color: var(--faq-panel-text);
}
.page-faq__support-inner {
  padding: 32px 24px;
  position: relative;
}
.page-faq__support-title {
  font-family: var(--font-mono, 'DM Mono', 'JetBrains Mono', monospace);
  font-weight: 700;
  font-size: 1.5rem;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}
.page-faq__support-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0 0 20px;
  opacity: 0.85;
  max-width: 520px;
}
.page-faq__support-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  margin-bottom: 20px;
}
.page-faq__support-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-family: var(--font-mono, 'DM Mono', 'JetBrains Mono', monospace);
  color: var(--faq-panel-text);
}
.page-faq__support-item svg {
  flex-shrink: 0;
  opacity: 0.7;
}
.page-faq__support-item a {
  color: var(--faq-panel-accent);
  text-decoration: none;
  transition: opacity var(--faq-transition);
}
.page-faq__support-item a:hover {
  opacity: 0.8;
  text-decoration: underline;
}
.page-faq__support-graphic {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: 12px;
  object-fit: cover;
  display: block;
  margin-top: 8px;
}
/* 隐藏辅助类 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
/* 响应式：桌面端 */
@media (min-width: 768px) {
  .page-faq {
    padding: 0 32px 60px;
  }
  .page-faq__layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 40px;
  }
  .page-faq__sidebar {
    position: sticky;
    top: calc(var(--nav-height, 60px) + 20px);
    width: var(--faq-sidebar-width);
    max-height: calc(100vh - var(--nav-height, 60px) - 80px);
    overflow-y: auto;
    flex-shrink: 0;
  }
  .page-faq__panel {
    padding: 28px 24px;
  }
  .page-faq__content {
    flex: 1;
    min-width: 0;
  }
  .page-faq__items {
    gap: 14px;
  }
  .page-faq__item summary {
    padding: 18px 24px;
    font-size: 1.05rem;
  }
  .page-faq__answer {
    padding: 0 24px;
  }
  .page-faq__item[open] .page-faq__answer {
    padding: 0 24px 24px;
  }
  .page-faq__support-inner {
    padding: 40px 36px;
  }
  .page-faq__support-graphic {
    margin-top: 12px;
  }
}
@media (min-width: 1024px) {
  .page-faq {
    padding: 0 48px 80px;
  }
  .page-faq__sidebar {
    --faq-sidebar-width: 300px;
  }
  .page-faq__layout {
    gap: 56px;
  }
  .page-faq__subtitle {
    font-size: 1.05rem;
  }
}
/* 当问答项隐藏时（前端筛选） */
.page-faq__item.is-hidden {
  display: none;
}
/* 确保图片响应式 */
.page-faq img {
  max-width: 100%;
  height: auto;
}
/* 品牌色点缀：胶囊内图标圆角调整 */
.page-faq__filter-icon {
  border-radius: 50%;
}
/* 专注态提升可访问性 */
.page-faq__filter:focus-visible,
.page-faq__search-input:focus-visible,
.page-faq__item summary:focus-visible {
  outline: 2px dashed var(--faq-panel-accent, #d4a843);
  outline-offset: 2px;
}
/* 窄屏下分类标签横向滚动 */
@media (max-width: 767px) {
  .page-faq__filters {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 8px;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
  }
  .page-faq__filter {
    flex-shrink: 0;
    width: auto;
    white-space: nowrap;
    padding: 6px 14px;
    font-size: 0.8rem;
  }
  .page-faq__filter-icon {
    width: 32px;
    height: 32px;
  }
  .page-faq__panel-head {
    margin-bottom: 16px;
  }
  .page-faq__support-meta {
    flex-direction: column;
    gap: 10px;
  }
  .page-faq__support-graphic {
    max-width: 100%;
  }
}
/* 极端窄屏安全 */
@media (max-width: 400px) {
  .page-faq {
    padding: 0 8px 32px;
  }
  .page-faq__panel {
    padding: 16px 14px;
  }
  .page-faq__item summary {
    padding: 12px 14px;
    font-size: 0.9rem;
  }
  .page-faq__item[open] .page-faq__answer {
    padding: 0 14px 16px;
  }
  .page-faq__support-inner {
    padding: 24px 16px;
  }
}
/* 动效：页面加载时内容逐项淡入（渐进增强） */
.page-faq__item {
  animation: faqFadeIn 0.4s ease both;
}
.page-faq__item:nth-child(1) { animation-delay: 0.02s; }
.page-faq__item:nth-child(2) { animation-delay: 0.05s; }
.page-faq__item:nth-child(3) { animation-delay: 0.08s; }
.page-faq__item:nth-child(4) { animation-delay: 0.11s; }
.page-faq__item:nth-child(5) { animation-delay: 0.14s; }
.page-faq__item:nth-child(6) { animation-delay: 0.17s; }
.page-faq__item:nth-child(7) { animation-delay: 0.20s; }
.page-faq__item:nth-child(8) { animation-delay: 0.23s; }
.page-faq__item:nth-child(9) { animation-delay: 0.26s; }
.page-faq__item:nth-child(10) { animation-delay: 0.29s; }
.page-faq__item:nth-child(11) { animation-delay: 0.32s; }
@keyframes faqFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-faq__item,
  .page-faq__answer,
  .page-faq__filter,
  .page-faq__search-input,
  .page-faq__item summary::after {
    animation: none !important;
    transition: none !important;
  }
}