.page-faq {
  --faq-cut: 18px;
  --faq-rail-w: 236px;
  padding-bottom: 96px;
}

/* 面包屑 */
.page-faq .breadcrumb {
  padding-top: 28px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}
.page-faq .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-faq .crumb-sep {
  margin: 0 8px;
  color: var(--line);
}
.page-faq .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* 首屏声明 */
.page-faq .faq-head {
  padding: 34px 0 0;
}
.page-faq .faq-head .tag {
  color: var(--cyan);
}
.page-faq .faq-head h1 {
  margin: 16px 0 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(28px, 6vw, 52px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-faq .faq-head .lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
}
.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
}
.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-800);
}
.page-faq .faq-stats .num {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--cyan);
}
.page-faq .faq-stats li span:last-child {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--muted);
}

/* 主布局 */
.page-faq .faq-layout {
  margin-top: 56px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}
.page-faq .faq-stream {
  display: grid;
  gap: 64px;
  min-width: 0;
}

/* 分类竖列 */
.page-faq .faq-rail {
  border-top: 1px solid var(--line-soft);
  padding-top: 20px;
}
.page-faq .rail-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .rail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .rail-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: border-color var(--fast) var(--ease), color var(--fast) var(--ease), background var(--fast) var(--ease);
}
.page-faq .rail-list a:hover,
.page-faq .rail-list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-06);
}
.page-faq .rail-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}
.page-faq .rail-note {
  margin: 20px 0 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
.page-faq .rail-cta {
  display: inline-block;
  font-size: 14px;
}

/* 分组摘要卡 */
.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: 96px;
}
.page-faq .group-card {
  padding: 26px 24px 22px;
  background: linear-gradient(158deg, var(--ink-700) 0%, var(--ink-800) 46%);
  border: 1px solid var(--line-faint);
  clip-path: polygon(
    0 0,
    calc(100% - var(--faq-cut)) 0,
    100% var(--faq-cut),
    100% 100%,
    var(--faq-cut) 100%,
    0 calc(100% - var(--faq-cut))
  );
}
.page-faq .group-card .tag {
  color: var(--cyan);
}
.page-faq .group-card h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-faq .group-sum {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}
.page-faq .group-points {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed var(--line-soft);
  list-style: none;
}
.page-faq .group-points li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
}
.page-faq .group-points li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  margin-top: 8px;
  background: var(--cyan);
  transform: rotate(45deg);
}
.page-faq .group-points--hot li::before {
  background: var(--amber);
}
.page-faq .group-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.page-faq .group-link::after {
  content: "\2192";
  font-family: var(--font-mono);
}
.page-faq .group-link:hover,
.page-faq .group-link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* 配图 */
.page-faq .faq-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line-faint);
  background: var(--ink-800);
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-cap {
  margin: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--line-faint);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* 问答折叠流 */
.page-faq .qa-list {
  margin-top: 24px;
  border-top: 1px solid var(--line-soft);
}
.page-faq .qa {
  border-bottom: 1px solid var(--line-soft);
}
.page-faq .qa summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 42px 18px 4px;
  cursor: pointer;
  list-style: none;
  transition: background var(--fast) var(--ease);
}
.page-faq .qa summary::-webkit-details-marker {
  display: none;
}
.page-faq .qa summary:hover,
.page-faq .qa summary:focus-visible {
  background: var(--cyan-06);
}
.page-faq .qa-no {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
}
.page-faq .qa-q {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
}
.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  top: 16px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--base) var(--ease);
}
.page-faq .qa[open] summary {
  background: var(--ink-800);
}
.page-faq .qa[open] summary::after {
  transform: rotate(45deg);
}
.page-faq .qa-body {
  padding: 2px 18px 20px 4px;
}
.page-faq .qa-body p {
  margin: 0 0 12px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.page-faq .qa-body p:last-child {
  margin-bottom: 0;
}
.page-faq .qa-foot {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-faint);
}
.page-faq .qa-foot .tag {
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-faq .qa-anchor {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--line);
  text-decoration: none;
  transition: color var(--fast) var(--ease);
}
.page-faq .qa-anchor:hover,
.page-faq .qa-anchor:focus-visible {
  color: var(--cyan);
}

/* 响应式 */
@media (min-width: 720px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .qa-body {
    padding: 2px 42px 22px 58px;
  }
  .page-faq .group-card {
    padding: 32px 34px 26px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 88px;
    border-top: none;
    border-left: 2px solid var(--line);
    padding: 4px 0 4px 20px;
  }
  .page-faq .rail-list {
    display: grid;
    gap: 4px;
  }
  .page-faq .rail-list a {
    display: flex;
    justify-content: flex-start;
    padding: 9px 10px;
    border: none;
    border-left: 2px solid var(--line-faint);
    margin-left: -22px;
  }
  .page-faq .rail-list a:hover,
  .page-faq .rail-list a:focus-visible {
    border-left-color: var(--cyan);
    background: var(--cyan-06);
  }
  .page-faq .faq-stream {
    gap: 88px;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-head h1 {
    max-width: 24ch;
  }
  .page-faq .qa summary {
    padding-right: 48px;
  }
  .page-faq .qa-body {
    padding-right: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary::after,
  .page-faq .rail-list a,
  .page-faq .group-link,
  .page-faq .qa-anchor {
    transition: none;
  }
}