/* ========================================
   page-faq ｜ 问答中心
   作用域限定：.page-faq
   移动端优先 + 桌面媒体查询
   ======================================== */

/* ---------- 设计令牌（页面级） ---------- */
.page-faq {
  --faq-grad-hero: linear-gradient(145deg, #0B0B1A 0%, #1A0A2E 60%, #0B0B1A 100%);
  --faq-grad-section: linear-gradient(135deg, #7B2FF7, #00E5FF);
  --faq-glow-question: 0 0 12px rgba(123, 47, 247, 0.25);
  --faq-border-answer: 1px solid rgba(176, 176, 200, 0.15);
  --faq-radius-item: 6px;
  --faq-transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 面包屑 ---------- */
.page-faq__breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.5rem;
  padding-top: 1rem;
  padding-bottom: 0.5rem;
  font-family: var(--zb-font-body, 'Inter', sans-serif);
  font-size: 0.8125rem;
  color: var(--zb-text-secondary, #B0B0C8);
}
.page-faq__breadcrumb-link {
  color: var(--zb-secondary, #00E5FF);
  text-decoration: none;
  transition: color var(--faq-transition);
}
.page-faq__breadcrumb-link:hover {
  color: var(--zb-primary, #7B2FF7);
}
.page-faq__breadcrumb-sep {
  color: var(--zb-text-secondary, #B0B0C8);
  opacity: 0.5;
}
.page-faq__breadcrumb-current {
  color: var(--zb-text-primary, #FFF);
  opacity: 0.85;
}

/* ---------- Hero 区 ---------- */
.page-faq__hero {
  background: var(--faq-grad-hero);
  border-bottom: var(--zb-border-width, 3px) solid transparent;
  border-image: var(--zb-grad-main, linear-gradient(135deg, #7B2FF7, #00E5FF)) 1;
  padding: 2.5rem 0 2rem;
  position: relative;
}
.page-faq__hero::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--zb-grad-main, linear-gradient(135deg, #7B2FF7, #00E5FF));
  opacity: 0.3;
}
.page-faq__hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}
.page-faq__hero-visual {
  flex-shrink: 0;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: rgba(123, 47, 247, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 40px rgba(123, 47, 247, 0.2);
}
.page-faq__hero-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 0 12px rgba(0, 229, 255, 0.3));
}
.page-faq__hero-content {
  text-align: center;
  max-width: 640px;
}
.page-faq__hero-title {
  margin: 0 0 0.5rem;
  font-family: var(--zb-font-heading, 'Space Grotesk', sans-serif);
  font-weight: 800;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  line-height: 1.1;
  color: var(--zb-text-primary, #FFF);
  text-shadow: 0 0 10px #7B2FF7, 0 0 20px #00E5FF;
}
.page-faq__hero-desc {
  margin: 0 0 1.25rem;
  font-family: var(--zb-font-body, 'Inter', sans-serif);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--zb-text-secondary, #B0B0C8);
}

/* ---------- 搜索框 ---------- */
.page-faq__search {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
}
.page-faq__search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--zb-secondary, #00E5FF);
  pointer-events: none;
  line-height: 1;
}
.page-faq__search-input {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  background: var(--zb-bg-card, #1A1A2E);
  border: 2px solid rgba(0, 229, 255, 0.25);
  border-radius: var(--zb-radius, 4px);
  color: var(--zb-text-primary, #FFF);
  font-family: var(--zb-font-body, 'Inter', sans-serif);
  font-size: 0.9375rem;
  line-height: 1.4;
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
  appearance: none;
  -webkit-appearance: none;
}
.page-faq__search-input::placeholder {
  color: var(--zb-text-secondary, #B0B0C8);
  opacity: 0.6;
}
.page-faq__search-input:focus {
  outline: none;
  border-color: var(--zb-secondary, #00E5FF);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.15);
}

/* ---------- 主内容布局 ---------- */
.page-faq__main {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
}

/* ---------- 左侧导航（移动端水平标签，桌面侧栏） ---------- */
.page-faq__nav {
  flex-shrink: 0;
}
.page-faq__nav-heading {
  font-family: var(--zb-font-heading, 'Space Grotesk', sans-serif);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--zb-text-secondary, #B0B0C8);
  margin: 0 0 0.5rem;
  display: none;
}
.page-faq__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-faq__nav-link {
  display: block;
  padding: 0.45rem 1rem;
  font-family: var(--zb-font-body, 'Inter', sans-serif);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--zb-text-secondary, #B0B0C8);
  background: var(--zb-bg-card, #1A1A2E);
  border: 1px solid rgba(123, 47, 247, 0.2);
  border-radius: var(--zb-radius, 4px);
  text-decoration: none;
  transition: background var(--faq-transition), color var(--faq-transition), border-color var(--faq-transition);
  white-space: nowrap;
}
.page-faq__nav-link:hover {
  color: var(--zb-text-primary, #FFF);
  border-color: var(--zb-primary, #7B2FF7);
  background: rgba(123, 47, 247, 0.15);
}

/* ---------- 折叠面板 ---------- */
.page-faq__content {
  flex: 1;
  min-width: 0;
}

.page-faq__section {
  margin-bottom: 2.5rem;
}
.page-faq__section:last-child {
  margin-bottom: 0;
}

.page-faq__section-title {
  display: inline-block;
  margin: 0 0 0.25rem;
  padding: 0.35rem 1.25rem 0.35rem 1rem;
  font-family: var(--zb-font-heading, 'Space Grotesk', sans-serif);
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--zb-text-primary, #FFF);
  background: var(--faq-grad-section);
  border-radius: var(--zb-radius, 4px);
  box-shadow: 0 0 16px rgba(123, 47, 247, 0.2);
}
.page-faq__section-desc {
  margin: 0.5rem 0 1rem;
  font-family: var(--zb-font-body, 'Inter', sans-serif);
  font-size: 0.9375rem;
  color: var(--zb-text-secondary, #B0B0C8);
  padding-left: 0.25rem;
}

/* ---------- 单个问答项 ---------- */
.page-faq__item {
  margin-bottom: 0.75rem;
  border-radius: var(--faq-radius-item);
  background: var(--zb-bg-card, #1A1A2E);
  border: var(--zb-border-width, 3px) solid transparent;
  background-clip: padding-box;
  position: relative;
  box-shadow: var(--zb-shadow-card, 0 8px 32px rgba(0,0,0,0.6));
  transition: border-color var(--faq-transition), box-shadow var(--faq-transition);
}
.page-faq__item::before {
  content: '';
  position: absolute;
  inset: calc(var(--zb-border-width, 3px) * -1);
  border-radius: calc(var(--faq-radius-item) + 2px);
  background: var(--zb-grad-main, linear-gradient(135deg, #7B2FF7, #00E5FF));
  z-index: -1;
  opacity: 0.35;
  transition: opacity var(--faq-transition);
}
.page-faq__item[open] {
  border-color: transparent;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6), 0 0 20px rgba(123, 47, 247, 0.15);
}
.page-faq__item[open]::before {
  opacity: 0.7;
}

.page-faq__question {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  font-family: var(--zb-font-heading, 'Space Grotesk', sans-serif);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--zb-text-primary, #FFF);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  list-style: none;
  position: relative;
}
.page-faq__question::-webkit-details-marker {
  display: none;
}
.page-faq__question::before {
  content: '╱';
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--zb-secondary, #00E5FF);
  transform: rotate(15deg);
  transition: transform var(--faq-transition);
  flex-shrink: 0;
  line-height: 1;
  opacity: 0.7;
}
.page-faq__item[open] .page-faq__question::before {
  transform: rotate(75deg);
  color: var(--zb-primary, #7B2FF7);
  opacity: 1;
}
.page-faq__question:hover {
  text-shadow: var(--faq-glow-question);
}

.page-faq__answer {
  padding: 0 1.25rem 1.125rem;
  font-family: var(--zb-font-body, 'Inter', sans-serif);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--zb-text-primary, #FFF);
  border-top: var(--faq-border-answer);
  margin-top: 0;
  background: rgba(11, 11, 26, 0.35);
  border-radius: 0 0 var(--faq-radius-item) var(--faq-radius-item);
}
.page-faq__answer p {
  margin: 0.75rem 0;
}
.page-faq__answer p:first-child {
  margin-top: 0.75rem;
}
.page-faq__answer a {
  color: var(--zb-secondary, #00E5FF);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--faq-transition);
}
.page-faq__answer a:hover {
  color: var(--zb-primary, #7B2FF7);
}

.page-faq__answer-img {
  margin: 1rem 0 0.5rem;
  max-width: 100%;
}
.page-faq__answer-img img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--zb-radius, 4px);
  border: 1px solid rgba(0, 229, 255, 0.15);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ---------- 相关链接区 ---------- */
.page-faq__related {
  padding-top: 1rem;
  padding-bottom: 3rem;
}
.page-faq__related-title {
  font-family: var(--zb-font-heading, 'Space Grotesk', sans-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--zb-text-primary, #FFF);
  margin: 0 0 1rem;
  text-align: center;
  text-shadow: 0 0 8px rgba(123, 47, 247, 0.25);
}
.page-faq__related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.page-faq__related-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: var(--zb-bg-card, #1A1A2E);
  border: var(--zb-border-width, 3px) solid transparent;
  border-radius: var(--zb-radius, 4px);
  position: relative;
  background-clip: padding-box;
  text-decoration: none;
  box-shadow: var(--zb-shadow-card, 0 8px 32px rgba(0,0,0,0.6));
  transition: transform var(--faq-transition), box-shadow var(--faq-transition);
}
.page-faq__related-card::before {
  content: '';
  position: absolute;
  inset: calc(var(--zb-border-width, 3px) * -1);
  border-radius: calc(var(--zb-radius, 4px) + 2px);
  background: var(--zb-grad-main, linear-gradient(135deg, #7B2FF7, #00E5FF));
  z-index: -1;
  opacity: 0.25;
  transition: opacity var(--faq-transition);
}
.page-faq__related-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.7);
}
.page-faq__related-card:hover::before {
  opacity: 0.6;
}
.page-faq__related-card-icon {
  font-size: 1.25rem;
  color: var(--zb-secondary, #00E5FF);
  line-height: 1;
}
.page-faq__related-card-label {
  font-family: var(--zb-font-heading, 'Space Grotesk', sans-serif);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--zb-text-primary, #FFF);
}
.page-faq__related-card-desc {
  font-family: var(--zb-font-body, 'Inter', sans-serif);
  font-size: 0.75rem;
  color: var(--zb-text-secondary, #B0B0C8);
}

/* ========================================
   桌面端媒体查询 (min-width: 768px)
   ======================================== */
@media (min-width: 768px) {
  .page-faq__hero {
    padding: 3rem 0 2.5rem;
  }
  .page-faq__hero-inner {
    flex-direction: row;
    justify-content: center;
    gap: 2.5rem;
  }
  .page-faq__hero-visual {
    width: 180px;
    height: 180px;
  }
  .page-faq__hero-content {
    text-align: left;
  }
  .page-faq__search {
    margin: 0;
  }

  .page-faq__main {
    flex-direction: row;
    align-items: flex-start;
    gap: 2rem;
    padding-top: 2rem;
  }

  .page-faq__nav {
    position: sticky;
    top: calc(var(--zb-header-h, 56px) + 1rem);
    width: 180px;
    flex-shrink: 0;
  }
  .page-faq__nav-heading {
    display: block;
  }
  .page-faq__nav-list {
    flex-direction: column;
    gap: 0.375rem;
  }
  .page-faq__nav-link {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    white-space: normal;
  }

  .page-faq__content {
    max-width: 740px;
  }

  .page-faq__section-title {
    font-size: 1.375rem;
  }

  .page-faq__question {
    padding: 1.125rem 1.5rem;
    font-size: 1.0625rem;
  }
  .page-faq__answer {
    padding: 0 1.5rem 1.25rem;
    font-size: 0.9375rem;
  }

  .page-faq__related-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }
  .page-faq__related-title {
    font-size: 1.375rem;
  }
}

/* ========================================
   大桌面端 (min-width: 1024px)
   ======================================== */
@media (min-width: 1024px) {
  .page-faq__hero-visual {
    width: 200px;
    height: 200px;
  }
  .page-faq__nav {
    width: 200px;
  }
}