.page-faq {
  --faq-muted: #35506b;
  --faq-rule: rgba(15, 76, 92, 0.16);
  --faq-soft: #f2f7fc;
  display: block;
  background: #ffffff;
  color: var(--ink-blue);
}

/* ---------- 页首横幅 ---------- */
.page-faq__banner {
  position: relative;
  background: radial-gradient(130% 110% at 12% 0%, #0F4C5C 0%, #0B1B2B 56%, #071320 100%);
  color: var(--mist);
  padding: 30px var(--gutter) 0;
  overflow: hidden;
}

.page-faq__banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 168px;
  height: 3px;
  background: var(--lime);
}

.page-faq__banner-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 6px 0 32px;
}

.page-faq__banner-copy {
  min-width: 0;
}

.page-faq .breadcrumb {
  font-size: 13px;
  color: var(--steel);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.page-faq .breadcrumb a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease);
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  border-bottom-color: var(--sky);
}

.page-faq .breadcrumb__sep {
  color: rgba(154, 169, 184, 0.6);
}

.page-faq .eyebrow {
  margin: 18px 0 0;
  color: var(--lime);
  letter-spacing: 0.16em;
}

.page-faq__banner h1 {
  font-family: var(--font-head);
  font-size: clamp(44px, 9vw, 96px);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 10px 0 18px;
  color: #ffffff;
}

.page-faq__lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 58ch;
  margin: 0;
}

.page-faq__banner-note {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--steel);
  letter-spacing: 0.02em;
}

.page-faq__banner-note .num {
  font-family: var(--font-num);
  font-size: 20px;
  color: var(--ref-yellow);
  margin-right: 4px;
}

.page-faq__banner-media {
  margin: 0;
  overflow: hidden;
  clip-path: var(--cut-md);
  aspect-ratio: 16 / 9;
  background: #0F4C5C;
}

.page-faq__banner-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */
.page-faq__body {
  padding: 0 var(--gutter) 72px;
}

.page-faq__body-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
}

/* ---------- 左侧索引 ---------- */
.faq-index {
  padding: 32px 0 8px;
}

.faq-index .index-label {
  margin: 0 0 12px;
}

.faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.faq-index__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 14px;
  background: var(--faq-soft);
  color: var(--ink-blue);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  clip-path: var(--cut-sm);
  border-left: 2px solid transparent;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.faq-index__link:hover,
.faq-index__link:focus-visible {
  background: #e2eefa;
  border-left-color: var(--water-blue);
}

.faq-index__link:focus-visible {
  outline: 2px solid var(--water-blue);
  outline-offset: 2px;
}

.faq-index__num {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--steel);
}

/* ---------- 问答区 ---------- */
.faq-section {
  padding: 44px 0 40px;
  border-top: 1px solid var(--faq-rule);
  scroll-margin-top: 130px;
}

.faq-section:first-child {
  border-top: none;
  padding-top: 8px;
}

.faq-section__head .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.faq-section__head h2 {
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink-blue);
}

.faq-section__intro {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-muted);
  max-width: 62ch;
}

.faq-list {
  margin-top: 24px;
  border-top: 1px solid var(--faq-rule);
}

.faq-item {
  position: relative;
  border-bottom: 1px solid var(--faq-rule);
}

.faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  background: var(--lime);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur-mid) var(--ease);
}

.faq-item[open]::before {
  transform: scaleY(1);
}

.faq-item__q {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 4px 18px 20px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-blue);
  transition: color var(--dur-fast) var(--ease);
}

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

.faq-item__q:hover {
  color: var(--water-blue);
}

.faq-item__q:focus-visible {
  outline: 2px solid var(--water-blue);
  outline-offset: -2px;
}

.faq-item__icon {
  flex: 0 0 auto;
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--water-blue);
  transition: transform var(--dur-fast) var(--ease);
}

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

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

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

.faq-item__a {
  padding: 0 40px 22px 20px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--faq-muted);
}

.faq-item__a p {
  margin: 0 0 10px;
}

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

.faq-item__a .num {
  font-family: var(--font-num);
  color: var(--water-blue);
  font-weight: 500;
}

.faq-section__fig {
  margin: 28px 0 0;
  overflow: hidden;
  clip-path: var(--cut-md);
  background: var(--faq-soft);
}

.faq-section__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.faq-section__cap {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--steel);
  background: var(--faq-soft);
}

.faq-section__next {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 26px;
  padding: 12px 20px;
  background: var(--water-blue);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  clip-path: var(--cut-sm);
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.faq-section__next:hover,
.faq-section__next:focus-visible {
  background: #085a9c;
  transform: translateX(3px);
}

.faq-section__next:focus-visible {
  outline: 2px solid var(--ref-yellow);
  outline-offset: 3px;
}

.faq-section__next span[aria-hidden] {
  color: var(--lime);
  font-family: var(--font-num);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 900px) {
  .page-faq__banner {
    padding: 36px var(--gutter) 0;
  }

  .page-faq__banner-inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
    padding: 20px 0 44px;
  }

  .page-faq__banner-media {
    aspect-ratio: 16 / 10;
  }
}

@media (min-width: 960px) {
  .page-faq__body {
    padding-bottom: 96px;
  }

  .page-faq__body-inner {
    display: grid;
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .faq-index {
    position: sticky;
    top: 124px;
    padding: 44px 0 0;
  }

  .faq-index__list {
    display: block;
  }

  .faq-index__list li + li {
    margin-top: 4px;
  }

  .faq-index__link {
    background: none;
    justify-content: flex-start;
    gap: 10px;
    padding: 8px 10px;
    font-size: 14.5px;
  }

  .faq-index__num {
    margin-left: auto;
  }

  .faq-section {
    padding: 52px 0 48px;
  }

  .faq-section:first-child {
    padding-top: 44px;
  }

  .faq-item__a {
    padding-right: 72px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-item__icon::before,
  .page-faq .faq-item__icon::after,
  .page-faq .faq-index__link,
  .page-faq .faq-section__next {
    transition: none;
  }

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