.page-faq {
  --faq-rail-w: 232px;
  --faq-amber-line: 2px solid var(--amber-400);
  --faq-hair-dark: 1px solid rgba(159, 178, 196, 0.22);
  --faq-hair-paper: 1px solid rgba(27, 21, 18, 0.16);
}

/* 面包屑 */
.page-faq .crumbs {
  padding-top: 18px;
}
.page-faq .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(159, 178, 196, 0.72);
}
.page-faq .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(159, 178, 196, 0.38);
}
.page-faq .crumbs a {
  color: var(--cyan-400);
  text-decoration: none;
}
.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  text-decoration: underline;
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  padding: 44px 0 40px;
  border-bottom: var(--faq-hair-dark);
  background-image:
    linear-gradient(rgba(53, 208, 214, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 208, 214, 0.055) 1px, transparent 1px);
  background-size: 48px 48px;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan-400), transparent 60%);
}
.page-faq .faq-hero h1 {
  margin: 16px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 48px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--white-soft);
}
.page-faq .faq-hero .lede {
  margin: 20px 0 0;
  max-width: 62ch;
}
.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 28px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: var(--faq-hair-dark);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate-300);
}
.page-faq .faq-hero-meta .num {
  color: var(--amber-400);
  margin-right: 6px;
}

/* 双栏骨架 */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 72px;
}

/* 左侧分类轴 */
.page-faq .faq-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}
.page-faq .faq-rail-nav {
  overflow-x: auto;
  overscroll-behavior-x: contain;
}
.page-faq .faq-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
}
.page-faq .faq-rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: var(--faq-hair-dark);
  font-size: 13px;
  color: var(--slate-300);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}
.page-faq .faq-rail-link .num {
  font-size: 12px;
  color: var(--amber-400);
}
.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  color: var(--white-soft);
  border-color: var(--cyan-400);
  background: rgba(53, 208, 214, 0.09);
}
.page-faq .faq-rail-link:focus-visible {
  outline: 2px solid var(--amber-400);
  outline-offset: 2px;
}
.page-faq .faq-rail-hint {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(159, 178, 196, 0.75);
}

/* 分组 */
.page-faq .faq-group {
  scroll-margin-top: 96px;
  padding-bottom: 36px;
  margin-bottom: 36px;
  border-bottom: var(--faq-hair-dark);
}
.page-faq .faq-group-head {
  margin-bottom: 18px;
}
.page-faq .faq-group-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--white-soft);
}
.page-faq .faq-group-sub {
  margin: 10px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-300);
}

/* 折叠条目 */
.page-faq .faq-item {
  border-top: var(--faq-hair-dark);
}
.page-faq .faq-item--mark {
  border-left: var(--faq-amber-line);
  padding-left: 14px;
}
.page-faq .faq-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  transition: color 0.18s ease;
}
.page-faq .faq-q::-webkit-details-marker {
  display: none;
}
.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--amber-400);
  outline-offset: 2px;
}
.page-faq .faq-q-text {
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white-soft);
}
.page-faq .faq-q:hover .faq-q-text {
  color: var(--cyan-400);
}
.page-faq .faq-ver {
  flex: 0 0 auto;
  margin-top: 2px;
  padding: 2px 7px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber-400);
  border: 1px solid rgba(242, 178, 62, 0.42);
  white-space: nowrap;
}
.page-faq .faq-q-icon {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  margin-top: 7px;
}
.page-faq .faq-q-icon::before,
.page-faq .faq-q-icon::after {
  content: "";
  position: absolute;
  background: var(--cyan-400);
}
.page-faq .faq-q-icon::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 1px;
}
.page-faq .faq-q-icon::after {
  left: 5px;
  top: 0;
  width: 1px;
  height: 12px;
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.page-faq .faq-item[open] .faq-q-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}
.page-faq .faq-a {
  padding: 0 28px 18px 0;
}
.page-faq .faq-a p {
  margin: 0 0 8px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate-300);
}
.page-faq .faq-a p:last-child {
  margin-bottom: 0;
}
.page-faq .faq-a-lead {
  color: var(--white-soft);
  font-weight: 600;
}

/* 配图 */
.page-faq .faq-figure {
  margin: 20px 0 22px;
}

/* 奶油纸分组 */
.page-faq .faq-group--paper {
  padding: 26px 20px 22px;
  border-bottom: 0;
  margin-bottom: 0;
}
.page-faq .faq-group--paper .faq-group-head h2,
.page-faq .faq-group--paper .faq-q-text,
.page-faq .faq-group--paper .faq-a-lead {
  color: var(--brown-900);
}
.page-faq .faq-group--paper .faq-group-sub,
.page-faq .faq-group--paper .faq-a p {
  color: #4c3d33;
}
.page-faq .faq-group--paper .eyebrow {
  color: var(--cyan-700);
}
.page-faq .faq-group--paper .faq-item,
.page-faq .faq-group--paper .faq-q {
  border-top: var(--faq-hair-paper);
}
.page-faq .faq-group--paper .faq-q-icon::before,
.page-faq .faq-group--paper .faq-q-icon::after {
  background: var(--cyan-700);
}
.page-faq .faq-group--paper .faq-q:hover .faq-q-text {
  color: var(--cyan-700);
}

/* 尾部行动条 */
.page-faq .faq-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 44px;
  padding: 26px 22px;
  border: var(--faq-hair-dark);
  border-left: 3px solid var(--amber-400);
  background: linear-gradient(135deg, rgba(53, 208, 214, 0.09), rgba(7, 14, 23, 0) 62%);
}
.page-faq .faq-cta h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.2vw, 26px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--white-soft);
}
.page-faq .faq-cta-text p:not(.eyebrow) {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate-300);
}
.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-faq .faq-hero {
    padding: 56px 0 48px;
  }
  .page-faq .faq-layout {
    padding-top: 56px;
    padding-bottom: 96px;
  }
  .page-faq .faq-group--paper {
    padding: 30px 28px 26px;
  }
  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 28px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 64px;
    padding-bottom: 112px;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-faq .faq-rail-nav {
    overflow: visible;
  }
  .page-faq .faq-rail-list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    border-top: var(--faq-hair-dark);
  }
  .page-faq .faq-rail-link {
    border: 0;
    border-bottom: var(--faq-hair-dark);
    padding: 12px 0;
    white-space: normal;
    justify-content: flex-start;
  }
  .page-faq .faq-rail-link .num {
    min-width: 22px;
  }
  .page-faq .faq-group {
    padding-bottom: 44px;
    margin-bottom: 44px;
  }
  .page-faq .faq-a {
    padding-right: 48px;
  }
  .page-faq .faq-figure {
    margin: 24px 0 26px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-layout {
    grid-template-columns: 268px minmax(0, 1fr);
    gap: 72px;
  }
  .page-faq .faq-group--paper {
    padding: 34px 36px 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q-icon::after,
  .page-faq .faq-rail-link,
  .page-faq .faq-q,
  .page-faq .faq-q-text {
    transition: none;
  }
}