.page-faq {
  --faq-sticky: calc(var(--head-h) + 12px);
  position: relative;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(76px, 11vw, 132px) 0 clamp(40px, 6vw, 72px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -140px -10% auto -10%;
  height: 640px;
  background:
    radial-gradient(58% 68% at 16% 26%, rgba(23, 67, 160, 0.62), transparent 64%),
    radial-gradient(46% 52% at 84% 6%, rgba(255, 106, 26, 0.2), transparent 62%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
  align-items: center;
  min-width: 0;
}

.page-faq .faq-hero__copy {
  min-width: 0;
  max-width: 44rem;
}

.page-faq .faq-hero__copy .h1 {
  margin: 14px 0 18px;
}

.page-faq .faq-hero__copy .lede {
  color: var(--text-soft);
}

.page-faq .faq-hero__media {
  margin: 0;
  overflow: hidden;
  box-shadow: var(--shadow-lift);
}

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

/* 页内筛选 */
.page-faq .faq-search {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 30rem;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-faq .faq-search__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-faq .faq-search__input {
  width: 100%;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--snow);
  background: rgba(14, 30, 51, 0.86);
  border: 1px solid var(--line);
  border-left: 3px solid var(--flame);
  border-radius: var(--radius);
  padding: 13px 16px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-search__input::placeholder {
  color: var(--steel);
}

.page-faq .faq-search__input:focus-visible {
  outline: none;
  border-color: var(--ice);
  box-shadow: 0 0 0 3px rgba(168, 203, 255, 0.22);
}

.page-faq .faq-search__hint {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* 首屏数字 */
.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3.5vw, 40px);
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-stats__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--flame);
}

.page-faq .faq-stats__label {
  font-size: 13px;
  color: var(--text-soft);
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  padding-top: clamp(24px, 4vw, 40px);
}

.page-faq .faq-body__inner {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  min-width: 0;
}

/* 左侧分组索引 */
.page-faq .faq-nav {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  min-width: 0;
}

.page-faq .faq-nav__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

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

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

.page-faq .faq-nav__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--radius);
  white-space: nowrap;
  font-size: 14.5px;
  color: var(--text-soft);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-nav__link:hover,
.page-faq .faq-nav__link:focus-visible {
  color: var(--snow);
  border-left-color: var(--flame);
  background: var(--glass);
}

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

.page-faq .faq-nav__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--neon);
}

.page-faq .faq-nav__note {
  display: none;
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--steel);
}

/* 问答列 */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-intro {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-faq .faq-intro__frame {
  overflow: hidden;
}

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

.page-faq .faq-intro__cap {
  padding: 10px 2px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* 分组 */
.page-faq .faq-group {
  margin-bottom: clamp(34px, 5vw, 56px);
  scroll-margin-top: calc(var(--head-h) + 24px);
}

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

.page-faq .faq-group__head {
  position: sticky;
  top: var(--head-h);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  background: rgba(7, 11, 18, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--flame), rgba(43, 227, 208, 0.5) 42%, transparent 88%);
  opacity: 0.7;
}

.page-faq .faq-group__num {
  flex: none;
  padding: 4px 8px;
  border: 1px solid rgba(255, 106, 26, 0.45);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--flame);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 24px);
}

/* 问答条目 */
.page-faq .faq-item {
  position: relative;
  margin-bottom: 12px;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-left: 3px solid rgba(168, 203, 255, 0.26);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-item:not([open]):hover {
  border-left-color: var(--neon);
  transform: translateY(-2px);
}

.page-faq .faq-item[open] {
  border-left-color: var(--flame);
  background: linear-gradient(180deg, rgba(255, 106, 26, 0.08), rgba(14, 30, 51, 0.96) 46%);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px 18px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--snow);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1.2;
  color: var(--neon);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "–";
  color: var(--flame);
}

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

.page-faq .faq-item__a {
  padding: 0 18px 20px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 42rem;
}

.page-faq .faq-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(168, 203, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ice);
}

/* ---------- 尾部去向 ---------- */
.page-faq .faq-next {
  padding-top: clamp(44px, 6vw, 76px);
}

.page-faq .faq-next__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(230px, 100%), 1fr));
  gap: 16px;
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-faq .faq-next__card {
  display: block;
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-next__card:hover,
.page-faq .faq-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--flame);
  background: linear-gradient(160deg, rgba(255, 106, 26, 0.1), rgba(14, 30, 51, 0.98) 60%);
}

.page-faq .faq-next__card:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-faq .faq-next__idx {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-faq .faq-next__name {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--snow);
}

.page-faq .faq-next__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-faq .faq-next__go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--flame);
}

/* ---------- 断点 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body__inner {
    grid-template-columns: 252px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: var(--faq-sticky);
    max-height: calc(100vh - var(--head-h) - 48px);
    overflow-y: auto;
    border-top: 0;
    padding-top: 0;
  }

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

  .page-faq .faq-nav__note {
    display: block;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-item__q {
    padding: 15px 14px;
    font-size: 15px;
  }

  .page-faq .faq-item__a {
    padding: 0 14px 18px;
    font-size: 15px;
  }

  .page-faq .faq-group__head {
    padding: 12px 0;
    gap: 10px;
  }

  .page-faq .faq-group__head::after {
    opacity: 0.55;
  }

  .page-faq .faq-search {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-next__card,
  .page-faq .faq-nav__link {
    transition: none;
  }

  .page-faq .faq-item:not([open]):hover,
  .page-faq .faq-next__card:hover {
    transform: none;
  }
}