.page-faq {
  display: block;
  --faq-index-w: 236px;
  --faq-edge: rgba(192, 139, 62, .55);
}

.page-faq .breadcrumbs {
  margin-bottom: 18px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-top: clamp(18px, 4vw, 38px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 22px;
  margin-top: 6px;
}

.page-faq .faq-hero__lead h1 {
  margin: 10px 0 0;
  font-size: clamp(28px, 5.2vw, 44px);
  line-height: 1.22;
  letter-spacing: -.01em;
}

.page-faq .faq-hero__intro {
  max-width: 58ch;
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--gray-400);
}

.page-faq .faq-hero__note {
  padding: 18px 20px 20px;
  border-radius: var(--r-lg);
}

.page-faq .faq-checklist {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-checklist li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ivory);
}

.page-faq .faq-checklist .code {
  color: var(--copper);
  font-size: 12px;
  line-height: 1.9;
}

.page-faq .faq-banner {
  position: relative;
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  opacity: .5;
}

.page-faq .faq-banner__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 18px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--copper-light);
  background: linear-gradient(180deg, rgba(11, 22, 34, 0) 0%, rgba(11, 22, 34, .92) 78%);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
  margin-top: clamp(32px, 5vw, 64px);
}

/* 移动端：横向滚动的主题索引 */

.page-faq .faq-index__cap {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gray-400);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  color: var(--ivory);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}

.page-faq .faq-index__link .code {
  font-size: 11px;
  color: var(--copper);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--faq-edge);
  color: var(--copper-light);
  outline: none;
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: calc(var(--masthead-h) + 26px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 6vw, 64px);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__head .code {
  font-size: 12px;
  color: var(--copper);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(21px, 2.6vw, 27px);
  line-height: 1.35;
}

.page-faq .faq-group__lead {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gray-400);
}

/* ---------- 折叠条目 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-faq .faq-item {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: var(--paper);
  overflow: hidden;
  transition: border-color var(--dur-2) var(--ease), background var(--dur-2) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: var(--line);
}

.page-faq .faq-item.is-open {
  border-color: var(--faq-edge);
  background: rgba(27, 53, 80, .42);
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  margin: 0;
  padding: 16px;
  border: 0;
  background: transparent;
  color: var(--ivory);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.62;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease);
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: -2px;
}

.page-faq .faq-q__num {
  font-size: 11px;
  color: var(--copper);
}

.page-faq .faq-q__text {
  min-width: 0;
}

.page-faq .faq-q__mark {
  display: inline-flex;
  color: var(--copper-light);
  transition: transform var(--dur-2) var(--ease), color var(--dur-1) var(--ease);
}

.page-faq .faq-item.is-open .faq-q__mark {
  transform: rotate(135deg);
  color: var(--copper);
}

.page-faq .faq-a[hidden] {
  display: none;
}

.page-faq .faq-item.is-open .faq-a {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-a__inner {
  display: grid;
  gap: 16px;
  padding: 16px 16px 20px;
}

.page-faq .faq-a__body {
  min-width: 0;
}

.page-faq .faq-a__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--ivory);
  opacity: .9;
}

.page-faq .faq-a__body p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-a__body a {
  color: var(--copper-light);
  text-decoration: underline;
  text-decoration-color: rgba(216, 195, 154, .4);
  text-underline-offset: 3px;
}

.page-faq .faq-a__body a:hover {
  color: var(--copper);
}

.page-faq .faq-a__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: start;
}

.page-faq .faq-a__meta .code {
  font-size: 11px;
  color: var(--copper-light);
}

.page-faq .faq-a__meta .chip {
  font-size: 11px;
}

@keyframes faq-rise {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-item.is-open .faq-a__inner {
  animation: faq-rise var(--dur-3) var(--ease) both;
}

/* ---------- 章节插图 ---------- */

.page-faq .faq-figure {
  margin: 22px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--gray-400);
}

/* ---------- 末尾联系块 ---------- */

.page-faq .faq-contact {
  display: grid;
  gap: 18px;
  margin-top: 22px;
  padding: 22px 20px;
  border-radius: var(--r-xl);
  border-left: 3px solid var(--copper);
}

.page-faq .faq-contact__line {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--ivory);
  word-break: break-word;
}

.page-faq .faq-contact__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--gray-400);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-q {
    gap: 16px;
    padding: 18px 22px;
  }

  .page-faq .faq-a__inner {
    padding: 18px 22px 24px;
  }

  .page-faq .faq-contact {
    padding: 24px 26px;
  }
}

@media (min-width: 760px) {
  .page-faq .faq-a__inner {
    grid-template-columns: minmax(0, 1fr) 180px;
    gap: 24px;
  }

  .page-faq .faq-a__meta {
    flex-direction: column;
    align-items: flex-start;
    border-left: 1px solid var(--line-soft);
    padding-left: 18px;
  }

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

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 32px;
    align-items: end;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--masthead-h) + 28px);
    align-self: start;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__link {
    border-color: transparent;
    border-radius: var(--r-md);
    padding: 10px 12px;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: var(--paper);
    border-color: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item.is-open .faq-a__inner {
    animation: none;
  }

  .page-faq .faq-item.is-open .faq-q__mark {
    transform: none;
  }
}