/* ===== 问答中心 FAQ 页面专属样式 ===== */
.page-faq {
  background: var(--deep-space-blue);
  color: var(--ink-white);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-wrap: break-word;
}

/* Hero 首屏 */
.page-faq__hero {
  padding: 32px 0 56px;
  background: linear-gradient(135deg, rgba(10, 28, 47, 0.9) 0%, rgba(2, 11, 22, 0.4) 60%), var(--deep-space-blue);
  border-bottom: 1px solid var(--divider);
}
.page-faq__hero-grid {
  display: grid;
  gap: 32px;
  margin-top: 36px;
}
.page-faq__hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.page-faq__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink-white);
  margin: 0 0 20px;
}
.page-faq__title-sep {
  color: var(--electric-green);
  margin: 0 8px;
}
.page-faq__lead {
  font-size: 1rem;
  color: var(--mist-blue);
  max-width: 620px;
  margin: 0 0 32px;
}
.page-faq__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-faq__visual-card {
  background: var(--panel-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-panel);
}
.page-faq__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.page-faq__visual-foot {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-top: 1px solid var(--divider);
  background: var(--layer-blue);
}
.page-faq__visual-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--electric-green);
  line-height: 1;
}
.page-faq__visual-text {
  font-size: 0.85rem;
  color: var(--mist-blue);
  letter-spacing: 0.04em;
}

/* 分类快捷入口 */
.page-faq__topics {
  background: var(--panel-blue);
  padding: 28px 0;
}
.page-faq__topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.page-faq__topic {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  background: var(--deep-space-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--ink-white);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.page-faq__topic:hover,
.page-faq__topic:focus-visible {
  border-color: var(--electric-green);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  outline: none;
}
.page-faq__topic-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--signal-orange);
}
.page-faq__topic-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
}
.page-faq__topic-count {
  font-size: 0.78rem;
  color: var(--mist-blue);
}

/* FAQ 主体 */
.page-faq__body {
  padding: 56px 0 72px;
}
.page-faq__layout {
  display: grid;
  gap: 36px;
}
.page-faq__side-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ink-white);
  margin: 0 0 16px;
  letter-spacing: 0.02em;
}
.page-faq__index {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-bottom: 1px solid var(--divider);
}
.page-faq__index-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 8px 12px 0;
  text-decoration: none;
  color: var(--mist-blue);
  border-bottom: 1px solid var(--divider);
  font-size: 0.95rem;
  transition: color 0.2s ease, border-color 0.2s ease, padding-left 0.2s ease;
}
.page-faq__index-link:hover,
.page-faq__index-link:focus-visible {
  color: var(--electric-green);
  border-bottom-color: var(--electric-green);
  padding-left: 6px;
  outline: none;
}
.page-faq__index-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--signal-orange);
}
.page-faq__side-note {
  margin-top: 20px;
  background: var(--panel-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
}
.page-faq__side-note-label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist-blue);
}
.page-faq__side-note-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--electric-green);
  margin: 4px 0;
}
.page-faq__side-note-sub {
  font-size: 0.85rem;
  color: var(--mist-blue);
}
.page-faq__side-link {
  display: inline-block;
  margin-top: 18px;
  color: var(--signal-orange);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  transition: color 0.2s ease;
}
.page-faq__side-link:hover {
  color: var(--electric-green);
}
.page-faq__panels {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

/* 折叠面板组 */
.page-faq__group {
  background: var(--panel-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-lg);
  padding: 26px 22px 18px;
  scroll-margin-top: 110px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.page-faq__group:target {
  border-color: var(--electric-green);
  box-shadow: var(--shadow-glow);
  background: var(--layer-blue);
}
.page-faq__group-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 16px;
}
.page-faq__group-index {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2rem;
  color: var(--signal-orange);
  line-height: 0.9;
}
.page-faq__group-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 6px;
}
.page-faq__group-desc {
  color: var(--mist-blue);
  font-size: 0.9rem;
  margin: 0;
}

/* 单个问答项 */
.page-faq__item {
  background: var(--panel-blue);
  border: 1px solid var(--divider);
  border-radius: var(--radius-md);
  margin-top: 14px;
  transition: background 0.35s ease, border-color 0.35s ease;
}
.page-faq__item[open] {
  background: var(--layer-blue);
  border-color: rgba(76, 242, 0, 0.45);
}
.page-faq__question {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px;
  cursor: pointer;
  list-style: none;
  user-select: none;
  border-radius: var(--radius-md);
}
.page-faq__question::-webkit-details-marker {
  display: none;
}
.page-faq__question:focus-visible {
  outline: 2px solid var(--electric-green);
  outline-offset: -2px;
}
.page-faq__q-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--signal-orange);
  white-space: nowrap;
}
.page-faq__q-text {
  flex: 1;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-white);
  margin: 0;
  line-height: 1.5;
}
.page-faq__q-arrow {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--signal-orange);
  transition: transform 0.25s ease, color 0.25s ease;
}
.page-faq__item[open] .page-faq__q-arrow {
  color: var(--electric-green);
  transform: rotate(45deg);
}
.page-faq__answer {
  color: var(--mist-blue);
  font-size: 0.95rem;
  padding: 0 18px 20px 46px;
  border-top: 1px solid var(--divider);
  margin-top: 12px;
  padding-top: 14px;
}
.page-faq__answer p {
  margin: 0;
}

/* 更新流程说明 */
.page-faq__update {
  padding: 72px 0;
  background: var(--layer-blue);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
}
.page-faq__update-head {
  display: grid;
  gap: 16px;
  margin-bottom: 28px;
}
.page-faq__update-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  font-weight: 800;
  margin: 8px 0 0;
  line-height: 1.2;
}
.page-faq__update-lead {
  color: var(--mist-blue);
  margin: 0;
  max-width: 640px;
}
.page-faq__update-stage {
  display: grid;
  gap: 20px;
}
.page-faq__stage-diagram {
  background: var(--deep-space-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-lg);
  padding: 16px 12px;
  overflow-x: auto;
}
.page-faq__stage-diagram svg {
  width: 100%;
  min-width: 560px;
  height: auto;
  display: block;
}
.page-faq__stage-diagram text {
  font-family: var(--font-mono);
}
.page-faq__stage-circle {
  fill: var(--deep-space-blue);
  stroke: var(--signal-orange);
  stroke-width: 3;
}
.page-faq__stage-circle--final {
  fill: var(--electric-green);
  stroke: var(--electric-green);
}
.page-faq__stage-label,
.page-faq__stage-label-final {
  fill: var(--ink-white);
  font-size: 14px;
  font-weight: 600;
}
.page-faq__stage-label-final {
  fill: var(--electric-green);
  font-weight: 700;
}
.page-faq__stage-sub,
.page-faq__stage-sub-final {
  fill: var(--mist-blue);
  font-size: 12px;
}
.page-faq__stage-sub-final {
  fill: var(--ink-white);
}
.page-faq__stage-figure {
  margin: 0;
  background: var(--panel-blue);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.page-faq__stage-photo {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}
.page-faq__stage-caption {
  color: var(--mist-blue);
  font-size: 0.88rem;
  padding: 14px 18px;
  border-top: 1px solid var(--divider);
}

/* 帮助引导区 */
.page-faq__help {
  padding: 72px 0;
}
.page-faq__help-card {
  background: linear-gradient(135deg, var(--panel-blue) 0%, var(--layer-blue) 100%);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center;
  max-width: 840px;
  margin: 0 auto;
}
.page-faq__help-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  margin: 0 0 12px;
}
.page-faq__help-desc {
  color: var(--mist-blue);
  max-width: 560px;
  margin: 0 auto 20px;
}
.page-faq__help-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 26px;
}
.page-faq__help-item {
  color: var(--mist-blue);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  border: 1px solid var(--divider);
  border-radius: 999px;
  padding: 8px 14px;
}
.page-faq__help-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* 移动端适配 */
@media (max-width: 480px) {
  .page-faq__topic-grid {
    grid-template-columns: 1fr;
  }
  .page-faq__question {
    flex-wrap: wrap;
    gap: 8px 12px;
  }
  .page-faq__q-num {
    width: 100%;
  }
  .page-faq__answer {
    padding-left: 18px;
    padding-right: 18px;
  }
  .page-faq__group {
    padding: 20px 16px 14px;
  }
  .page-faq__help-card {
    padding: 28px 18px;
  }
}

/* 桌面端布局 */
@media (min-width: 900px) {
  .page-faq__hero {
    padding: 48px 0 72px;
  }
  .page-faq__hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 48px;
  }
  .page-faq__topic-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
  .page-faq__layout {
    grid-template-columns: 240px 1fr;
    gap: 48px;
    align-items: start;
  }
  .page-faq__side {
    position: sticky;
    top: 110px;
    border-left: 2px solid var(--line-blue);
    padding-left: 18px;
  }
  .page-faq__panels {
    gap: 24px;
  }
  .page-faq__group {
    padding: 32px 28px 24px;
  }
  .page-faq__update-head {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: end;
  }
  .page-faq__update-stage {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: stretch;
  }
  .page-faq__help-card {
    padding: 48px;
  }
}