.page-faq {
  --faq-shell: 1120px;
  --faq-radius: 24px;
  padding-bottom: clamp(64px, 9vw, 128px);
}

.page-faq .faq-shell {
  width: 100%;
  max-width: var(--faq-shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 64px);
}

.page-faq .breadcrumb {
  padding-top: clamp(20px, 3vw, 36px);
  font-size: 0.8125rem;
  color: var(--fog);
}

.page-faq .breadcrumb__item a {
  color: var(--fog);
  text-decoration: none;
}

.page-faq .breadcrumb__item a:hover,
.page-faq .breadcrumb__item a:focus-visible {
  color: var(--signal);
}

.page-faq .breadcrumb__sep {
  margin-inline: 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  display: grid;
  gap: 32px;
  padding-top: clamp(28px, 5vw, 56px);
}

.page-faq .faq-hero__text {
  max-width: 62ch;
}

.page-faq .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-faq .faq-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 7vw, 4.4rem);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-lead {
  margin: 24px 0 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--fog);
}

.page-faq .faq-hero__meta {
  margin: 20px 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .link-underline {
  color: var(--mist);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 4px;
}

.page-faq .link-underline:hover,
.page-faq .link-underline:focus-visible {
  color: var(--signal);
}

.page-faq .faq-hero__art {
  border-radius: 32px;
  border: 1px solid var(--line);
  background: var(--harbor);
  overflow: hidden;
  max-width: 420px;
}

.page-faq .faq-hero__art img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 吸顶索引 ---------- */

.page-faq .faq-index {
  position: sticky;
  top: var(--header-h);
  z-index: 5;
  margin-top: clamp(28px, 4vw, 48px);
  background: rgba(6, 24, 38, 0.94);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-block: 1px solid var(--line);
}

.page-faq .faq-index__track {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 0;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--fog);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-faq .faq-index__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  background: var(--harbor);
  border-color: var(--line);
  font-weight: 700;
}

.page-faq .faq-index__link:hover .faq-index__dot,
.page-faq .faq-index__link:focus-visible .faq-index__dot {
  background: var(--ember);
  transform: scale(1.4);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  padding-top: clamp(56px, 8vw, 104px);
  scroll-margin-top: calc(var(--header-h) + 72px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  color: var(--signal);
}

.page-faq .faq-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  font-weight: 750;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-lead-line {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--fog);
}

/* ---------- 步骤 ---------- */

.page-faq .faq-steps {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  max-width: 60ch;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-faq .faq-step__no {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--tide);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1;
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 图 ---------- */

.page-faq .faq-figure {
  margin: 32px 0 0;
  border-radius: var(--faq-radius);
  border: 1px solid var(--line);
  background: var(--harbor);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 抽屉 ---------- */

.page-faq .faq-acc {
  margin-top: 32px;
  max-width: 72ch;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item {
  border-top: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--harbor);
  box-shadow: inset 2px 0 0 var(--signal);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 12px 20px 8px;
  cursor: pointer;
  list-style: none;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item__q::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover {
  color: var(--mist);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  border-radius: 6px;
}

.page-faq .faq-item__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-faq .faq-item__icon::before,
.page-faq .faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--signal);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-item__icon::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-item__icon::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-item__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 0 24px 24px 24px;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--fog);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 58ch;
}

/* ---------- 术语表 ---------- */

.page-faq .faq-terms {
  margin: 32px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-faq .faq-term {
  display: grid;
  gap: 6px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-term dt {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-faq .faq-term dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-next {
  margin-top: clamp(56px, 8vw, 96px);
  padding: clamp(24px, 4vw, 40px);
  border-radius: 32px;
  border: 1px solid var(--line);
  background: var(--harbor);
  display: grid;
  gap: 24px;
}

.page-faq .faq-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 750;
  line-height: 1.25;
  color: var(--paper);
}

.page-faq .faq-next__text {
  margin: 12px 0 0;
  max-width: 48ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--fog);
}

.page-faq .faq-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 40px;
  }

  .page-faq .faq-index__link {
    padding: 8px 16px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
    align-items: end;
  }

  .page-faq .faq-hero__art {
    max-width: none;
    justify-self: end;
    width: 100%;
  }

  .page-faq .faq-index__track {
    overflow-x: visible;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 10px;
    padding: 14px 0;
  }

  .page-faq .faq-next {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-faq .faq-next__links {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-index__link,
  .page-faq .faq-index__dot,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after {
    transition-duration: 1ms;
  }

  .page-faq .faq-index__link:hover .faq-index__dot,
  .page-faq .faq-index__link:focus-visible .faq-index__dot {
    transform: none;
  }
}