/* ===== 问题解答页：两列问答索引 + 技术蓝图网格 ===== */
.page-faq {
  --faq-gold-soft: rgba(212, 175, 55, 0.12);
  --faq-gold-border: rgba(212, 175, 55, 0.45);
  --faq-panel-bg: rgba(27, 58, 107, 0.3);
  position: relative;
  background:
    linear-gradient(rgba(10, 20, 40, 0.94), rgba(10, 20, 40, 0.97)),
    repeating-linear-gradient(90deg, rgba(42, 75, 124, 0.16) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(42, 75, 124, 0.16) 0 1px, transparent 1px 80px);
  color: var(--c-ice);
  font-family: var(--font-body);
  min-height: 100vh;
  padding: 1.25rem 0 3rem;
}

/* 面包屑 */
.page-faq .breadcrumb {
  margin-bottom: 2rem;
}
.page-faq .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.82rem;
  color: var(--c-mist);
}
.page-faq .breadcrumb a {
  color: var(--c-gold);
  text-decoration: none;
}
.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  text-decoration: underline;
}
.page-faq .faq-breadcrumb-sep {
  margin-left: 0.4rem;
  color: var(--c-mist);
}

/* Hero 区域 */
.page-faq .faq-hero {
  padding: 1.5rem 0 2.2rem;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 2rem;
}
.page-faq .faq-hero-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
.page-faq .faq-hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--c-gold);
  text-transform: uppercase;
}
.page-faq .faq-hero-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mist);
}
.page-faq .faq-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 3.1rem);
  line-height: 1.15;
  margin: 0 0 0.9rem;
  max-width: 760px;
}
.page-faq .faq-lead {
  margin: 0 0 1.5rem;
  max-width: 680px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--c-mist);
}
.page-faq .faq-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.8rem;
  margin: 0;
  padding: 0;
}
.page-faq .faq-stat {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  margin: 0;
}
.page-faq .faq-stat dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mist);
}
.page-faq .faq-stat dd {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--c-gold);
  margin: 0;
}

/* 两列布局 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

/* 侧栏索引 */
.page-faq .faq-sidemenu {
  background: rgba(27, 58, 107, 0.25);
  border: 1px solid var(--c-border);
  border-radius: 18px;
  padding: 1.2rem;
}
.page-faq .faq-sidemenu-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ice);
  margin: 0 0 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--c-border);
}
.page-faq .faq-cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-faq .faq-cat-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  background: rgba(27, 58, 107, 0.18);
  text-decoration: none;
  color: var(--c-ice);
  font-size: 0.85rem;
  line-height: 1.2;
  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}
.page-faq .faq-cat-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-gold);
}
.page-faq .faq-cat-link:hover,
.page-faq .faq-cat-link:focus-visible {
  background: var(--faq-gold-soft);
  border-color: var(--faq-gold-border);
  color: var(--c-gold);
}
.page-faq .faq-sync-status {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1rem;
  padding: 0.7rem 0.85rem;
  background: rgba(39, 174, 96, 0.08);
  border: 1px solid rgba(39, 174, 96, 0.22);
  border-radius: 14px;
  font-size: 0.8rem;
  color: var(--c-mist);
  line-height: 1.4;
}
.page-faq .faq-sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 8px rgba(39, 174, 96, 0.7);
  flex-shrink: 0;
}

/* 右侧面板 */
.page-faq .faq-panels {
  display: flex;
  flex-direction: column;
  gap: 2.4rem;
}
.page-faq .faq-section {
  scroll-margin-top: 90px;
}
.page-faq .faq-section-head {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}
.page-faq .faq-section-index {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-gold);
}
.page-faq .faq-section-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0;
  color: var(--c-ice);
  line-height: 1.3;
}
.page-faq .faq-section-title::after {
  content: "";
  display: block;
  width: 34px;
  height: 2px;
  margin-top: 0.35rem;
  background: linear-gradient(90deg, var(--c-gold), transparent);
}
.page-faq .faq-section:target .faq-section-title {
  color: var(--c-gold);
}

/* QA 手风琴 */
.page-faq .faq-qa-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.page-faq .faq-item {
  background: var(--faq-panel-bg);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  overflow: hidden;
  transition:
    background 0.25s ease,
    border-color 0.25s ease;
}
.page-faq .faq-item:hover,
.page-faq .faq-item[open] {
  border-color: var(--faq-gold-border);
  background: rgba(27, 58, 107, 0.45);
}
.page-faq .faq-item summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.15rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.45;
  color: var(--c-ice);
  user-select: none;
}
.page-faq .faq-item summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item summary::marker {
  content: "";
}
.page-faq .faq-item summary::before {
  content: "?";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 3px;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mist);
  flex-shrink: 0;
  transition:
    transform 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}
.page-faq .faq-item summary:hover::before,
.page-faq .faq-item[open] summary::before {
  transform: scale(1.18);
  border-color: var(--c-gold);
  color: var(--c-gold);
}
.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--c-mist);
  transition: color 0.2s ease;
}
.page-faq .faq-item[open] summary::after {
  content: "−";
  color: var(--c-gold);
}
.page-faq .faq-answer {
  padding: 0 1.2rem 1.15rem 3.6rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--c-mist);
}
.page-faq .faq-answer p {
  margin: 0 0 0.55rem;
}
.page-faq .faq-answer p:last-child {
  margin-bottom: 0;
}
.page-faq .faq-answer a {
  color: var(--c-gold);
  text-decoration: none;
}
.page-faq .faq-answer a:hover {
  text-decoration: underline;
}

/* 会员条目金色描边 */
.page-faq .faq-item.is-member {
  border-color: rgba(212, 175, 55, 0.5);
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.09), rgba(27, 58, 107, 0.3));
}
.page-faq .faq-item.is-member:hover,
.page-faq .faq-item.is-member[open] {
  border-color: rgba(212, 175, 55, 0.7);
}
.page-faq .faq-item.is-member summary::before {
  border-color: rgba(212, 175, 55, 0.6);
  color: var(--c-gold);
}

/* 插图 */
.page-faq .faq-figure {
  margin: 1.5rem 0 0;
  padding: 0.7rem;
  background: rgba(27, 58, 107, 0.22);
  border: 1px solid var(--c-border);
  border-radius: 16px;
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  object-fit: cover;
}
.page-faq .faq-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mist);
  padding: 0.6rem 0.2rem 0.15rem;
  line-height: 1.4;
}
.page-faq .faq-figure-card {
  max-width: 420px;
}

/* 底部 CTA */
.page-faq .faq-cta {
  margin-top: 2.8rem;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  align-items: flex-start;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.14), rgba(27, 58, 107, 0.4));
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 20px;
}
.page-faq .faq-cta-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--c-ice);
  margin: 0 0 0.4rem;
}
.page-faq .faq-cta-desc {
  margin: 0;
  color: var(--c-mist);
  font-size: 0.9rem;
  line-height: 1.65;
}
.page-faq .faq-cta-desc a {
  color: var(--c-gold);
  text-decoration: none;
}
.page-faq .faq-cta-desc a:hover {
  text-decoration: underline;
}
.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* 中型屏幕适配 */
@media (min-width: 768px) {
  .page-faq {
    padding: 2rem 0 4.5rem;
  }
  .page-faq .faq-hero {
    padding: 2.2rem 0 2.6rem;
    margin-bottom: 2.4rem;
  }
  .page-faq .faq-cta {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 1.8rem 2rem;
  }
}

/* 桌面两列索引 */
@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 260px 1fr;
    gap: 2.2rem;
  }
  .page-faq .faq-sidemenu {
    position: sticky;
    top: 100px;
  }
  .page-faq .faq-cat-list {
    flex-direction: column;
  }
  .page-faq .faq-cat-link {
    border-radius: 12px;
    padding: 0.65rem 0.8rem;
  }
}