.page-faq {
  --faq-side: 176px;
  --faq-stack: clamp(20px, 3vw, 40px);
  padding-block: clamp(20px, 3vw, 36px) clamp(64px, 9vw, 120px);
}

/* 面包屑 */
.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: baseline;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist-300);
  margin-bottom: clamp(22px, 3.4vw, 40px);
}
.page-faq .breadcrumbs a {
  color: var(--lime-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur), color var(--dur);
}
.page-faq .breadcrumbs a:hover,
.page-faq .breadcrumbs a:focus-visible {
  border-bottom-color: var(--lime-400);
}
.page-faq .breadcrumbs span {
  color: var(--mist-300);
}

/* 首屏 */
.faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 34px);
  align-items: end;
}
.faq-hero__lead .label-caps {
  color: var(--orange-500);
  margin: 0 0 12px;
}
.page-faq h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(29px, 4.6vw, 52px);
  line-height: 1.24;
  letter-spacing: 0.005em;
  color: var(--text-100);
  max-width: 16em;
}
.faq-hero__note p {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist-300);
  max-width: 34em;
}
.faq-hero__note p:last-child {
  margin-bottom: 0;
}
.faq-hero__figure {
  margin: clamp(26px, 4vw, 52px) 0 0;
}

@media (min-width: 900px) {
  .faq-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: clamp(32px, 5vw, 76px);
  }
}

/* 主题跳转条 */
.faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(32px, 5vw, 60px);
  padding: 16px 0;
  border-top: 1px solid var(--ink-700);
  border-bottom: 1px solid var(--ink-700);
  scroll-margin-top: 96px;
}
.faq-jump__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  background: var(--ink-900);
  border: 1px solid var(--ink-700);
  color: var(--text-100);
  font-family: var(--font-sans);
  font-size: 14px;
  text-decoration: none;
  transition: transform var(--dur), border-color var(--dur), color var(--dur);
}
.faq-jump__link:hover,
.faq-jump__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--lime-400);
  color: var(--lime-400);
}
.faq-jump__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-500);
}

/* 分组骨架 */
.faq-group {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 26px);
  margin-top: clamp(48px, 7vw, 92px);
  scroll-margin-top: 88px;
}
.faq-group__side {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--ink-700);
}
.faq-group__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--orange-500);
}
.faq-group__tag {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--orange-500);
}
.faq-group__tag-text,
.faq-group__tag {
  display: block;
}

@media (min-width: 900px) {
  .faq-group {
    grid-template-columns: var(--faq-side) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 58px);
  }
  .faq-group__side {
    position: sticky;
    top: 96px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding-top: 0;
    border-top: 0;
  }
  .faq-group__tag {
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
  }
}

/* 刷新时间轴 */
.faq-timeline {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 34px);
  padding: 22px 22px 24px;
  border: 1px solid var(--ink-700);
  background: var(--ink-900);
  display: grid;
  gap: 26px;
}
.faq-timeline__node {
  position: relative;
  padding-top: 20px;
}
.faq-timeline__node::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 4px rgba(198, 255, 74, 0.14);
}
.faq-timeline__node::after {
  content: "";
  position: absolute;
  top: 9px;
  left: 14px;
  right: 0;
  height: 1px;
  background: var(--ink-700);
}
.faq-timeline__node--after::before {
  background: var(--orange-500);
  box-shadow: 0 0 0 4px rgba(255, 122, 51, 0.16);
}
.faq-timeline__node--after::after {
  display: none;
}
.faq-timeline__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime-400);
}
.faq-timeline__node--after .faq-timeline__time {
  color: var(--orange-500);
}
.faq-timeline__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist-300);
}

@media (min-width: 680px) {
  .faq-timeline {
    grid-template-columns: 1fr 1fr;
    gap: 34px;
  }
}

/* 问题与答案 */
.faq-group__body {
  min-width: 0;
  border-top: 1px solid var(--ink-700);
}
.faq-item {
  border-bottom: 1px solid var(--ink-700);
  scroll-margin-top: 100px;
}
.faq-q__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.6;
  color: var(--text-100);
  transition: color var(--dur);
}
.faq-q__summary::-webkit-details-marker {
  display: none;
}
.faq-q__summary:hover,
.faq-q__summary:focus-visible {
  color: var(--lime-400);
}
.faq-q__text {
  font-weight: 500;
}
.faq-q__mark {
  position: relative;
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  color: currentColor;
}
.faq-q__mark::before,
.faq-q__mark::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform var(--dur), opacity var(--dur);
}
.faq-q__mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}
.faq-q__mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}
.faq-q[open] .faq-q__mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}
.faq-q[open] .faq-q__summary {
  color: var(--lime-400);
}

.faq-a {
  margin: 0 0 20px;
  padding: 18px 20px 14px;
  background: var(--paper-50);
  border: 1px solid var(--ink-700);
  box-shadow: var(--shadow-paper);
  animation: faq-rise var(--dur) ease-out both;
}
.faq-a p {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-900);
  max-width: 62ch;
}
.faq-a a {
  color: var(--lime-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.faq-a a:hover,
.faq-a a:focus-visible {
  color: var(--ink-950);
  background: var(--orange-200);
}
.faq-a__anchor {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  color: var(--lime-600);
}
.faq-a__anchor:hover,
.faq-a__anchor:focus-visible {
  color: var(--orange-500);
}

@keyframes faq-rise {
  from {
    opacity: 0;
    transform: translateY(7px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.faq-group__figure {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  max-width: 480px;
}

/* 未解决区块 */
.faq-help {
  margin-top: clamp(56px, 8vw, 108px);
  scroll-margin-top: 88px;
}
.faq-help__paper {
  display: grid;
  gap: 16px;
  padding: clamp(24px, 4vw, 46px);
  background: var(--paper-50);
  border: 1px solid var(--ink-700);
  box-shadow: var(--shadow-paper);
}
.faq-help__paper .label-caps {
  margin: 0;
  color: var(--lime-600);
}
.faq-help__paper h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.3;
  color: var(--ink-950);
}
.faq-help__paper p {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-900);
  max-width: 60ch;
}
.faq-help__paper a {
  color: var(--lime-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.faq-help__paper a:hover,
.faq-help__paper a:focus-visible {
  color: var(--ink-950);
  background: var(--orange-200);
}
.faq-help__list {
  list-style: none;
  margin: 0;
  padding: 16px 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid rgba(23, 64, 52, 0.28);
  border-bottom: 1px solid rgba(23, 64, 52, 0.28);
}
.faq-help__list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-950);
  word-break: break-word;
}
.faq-help__k {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--lime-600);
}
.faq-help__actions {
  margin-top: 4px;
}
.faq-help__actions .btn {
  text-decoration: none;
}

@media (min-width: 620px) {
  .faq-help__list li {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-a {
    animation: none;
  }
  .page-faq .faq-jump__link,
  .page-faq .faq-q__mark::before,
  .page-faq .faq-q__mark::after,
  .page-faq .faq-q__summary,
  .page-faq .breadcrumbs a {
    transition: none;
  }
}
</main>