.page-faq {
  --faq-radius: 2px;
  --faq-line: var(--board);
  --faq-rail-w: 250px;
  background: var(--ink);
  color: var(--text-body);
}

/* ---------- 面包屑层 ---------- */
.page-faq .breadcrumbs {
  background: var(--ink);
  padding-block: 14px 0;
}
.page-faq .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mid);
}
.page-faq .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--mist);
}
.page-faq .breadcrumbs__item a {
  color: var(--mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}
.page-faq .breadcrumbs__item a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-faq .breadcrumbs__item[aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(110% 80% at 88% 0%, rgba(200, 246, 46, 0.13), transparent 58%),
    radial-gradient(90% 76% at 4% 100%, rgba(127, 212, 255, 0.11), transparent 62%),
    var(--ink);
  border-bottom: 1px solid var(--board);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    116deg,
    transparent 0 44px,
    rgba(232, 237, 231, 0.05) 44px 45px
  );
  pointer-events: none;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -32%;
  width: min(680px, 78vw);
  aspect-ratio: 1 / 1;
  background: conic-gradient(
    from 200deg,
    rgba(200, 246, 46, 0.16),
    transparent 32%,
    rgba(255, 106, 31, 0.14) 58%,
    transparent 82%
  );
  pointer-events: none;
}
.page-faq .faq-hero__inner {
  position: relative;
  z-index: 2;
  padding-block: clamp(42px, 6.5vw, 84px);
}
.page-faq .faq-hero__kicker {
  display: inline-block;
  margin: 0;
  padding: 4px 10px;
  border: 1px solid var(--board);
  color: var(--lime);
  background: rgba(200, 246, 46, 0.07);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.page-faq .faq-hero__title {
  margin: 18px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.2vw, 4.5rem);
  line-height: 1.03;
  letter-spacing: -0.022em;
  color: var(--white);
}
.page-faq .faq-hero__title em {
  display: block;
  font-style: normal;
  color: var(--lime);
}
.page-faq .faq-hero__lead {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.95;
  color: var(--text-body);
}

.page-faq .faq-hero__metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--board);
  border: 1px solid var(--board);
}
.page-faq .faq-hero__metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--charcoal);
}
.page-faq .faq-hero__val {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}
.page-faq .faq-hero__val em {
  font-style: normal;
  margin-left: 4px;
  font-size: 13px;
  color: var(--lime);
}
.page-faq .faq-hero__lab {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mid);
}

.page-faq .faq-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 章节通用 ---------- */
.page-faq .section__kicker {
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.page-faq .section__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-faq .section__lead {
  max-width: 64ch;
  color: var(--text-body);
  line-height: 1.9;
}

/* ---------- 四类入口 ---------- */
.page-faq .faq-index {
  background: var(--ink);
  border-bottom: 1px solid var(--board);
}
.page-faq .faq-index__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 0;
}
.page-faq .faq-index__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 22px;
  border: 1px solid var(--board);
  border-radius: var(--faq-radius);
  background: linear-gradient(180deg, rgba(30, 43, 37, 0.6), rgba(18, 28, 24, 0.9));
  text-decoration: none;
  color: var(--text-body);
  transition: transform var(--t), border-color var(--t), background var(--t);
}
.page-faq .faq-index__card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--lime);
  transition: width var(--t);
}
.page-faq .faq-index__card:hover,
.page-faq .faq-index__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--lime);
  background: linear-gradient(180deg, rgba(30, 43, 37, 0.95), rgba(18, 28, 24, 1));
}
.page-faq .faq-index__card:hover::after,
.page-faq .faq-index__card:focus-visible::after {
  width: 100%;
}
.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}
.page-faq .faq-index__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  letter-spacing: 0.01em;
  color: var(--white);
}
.page-faq .faq-index__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mid);
}
.page-faq .faq-index__tag {
  align-self: flex-start;
  margin-top: 4px;
  padding: 2px 8px;
  border: 1px solid var(--board);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-faq .faq-index__viz {
  margin: 34px 0 0;
  border: 1px solid var(--board);
  background: var(--charcoal);
}
.page-faq .faq-index__viz img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}
.page-faq .faq-index__viz figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--board);
  font-size: 13px;
  line-height: 1.8;
  color: var(--mid);
}

/* ---------- 主体：左索引 + 右问答 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-block: 48px 76px;
}

.page-faq .faq-rail {
  align-self: start;
  padding: 18px 16px 20px;
  border: 1px solid var(--board);
  border-top: 3px solid var(--lime);
  background: var(--charcoal);
}
.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}
.page-faq .faq-rail__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}
.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 8px;
  border-left: 2px solid transparent;
  color: var(--text-body);
  text-decoration: none;
  font-size: 14.5px;
  transition: border-color var(--t), color var(--t), background var(--t);
}
.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-left-color: var(--lime);
  background: rgba(200, 246, 46, 0.06);
  color: var(--white);
}
.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.page-faq .faq-rail__link:hover .faq-rail__num {
  color: var(--lime);
}
.page-faq .faq-rail__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--board);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--mid);
}

/* ---------- 分组 ---------- */
.page-faq .faq-flow {
  display: grid;
  gap: 52px;
  min-width: 0;
}
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + var(--ticker-h) + 20px);
  min-width: 0;
}
.page-faq .faq-group__head {
  padding-top: 16px;
  border-top: 2px solid var(--board);
  margin-bottom: 20px;
}
.page-faq .faq-group__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}
.page-faq .faq-group__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-faq .faq-group__lead {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mid);
}
.page-faq .faq-group__list {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-faq .faq-group--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}
.page-faq .faq-fig {
  margin: 0;
  border: 1px solid var(--board);
  background: var(--charcoal);
  align-self: start;
}
.page-faq .faq-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-faq .faq-fig figcaption {
  padding: 12px 14px;
  border-top: 1px solid var(--board);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--mid);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border: 1px solid var(--board);
  border-radius: var(--faq-radius);
  background: linear-gradient(180deg, rgba(30, 43, 37, 0.5), rgba(18, 28, 24, 0.82));
  transition: border-color var(--t), background var(--t), transform var(--t);
}
.page-faq .qa:hover {
  border-color: var(--mist);
}
.page-faq .qa[open] {
  border-color: var(--lime);
  background: linear-gradient(180deg, rgba(30, 43, 37, 0.85), rgba(11, 20, 16, 0.95));
}
.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 16px 15px;
  cursor: pointer;
  list-style: none;
  color: var(--white);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.65;
}
.page-faq .qa__q::-webkit-details-marker {
  display: none;
}
.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}
.page-faq .qa__idx {
  flex: 0 0 auto;
  padding: 2px 6px;
  border: 1px solid var(--board);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--lime);
}
.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}
.page-faq .qa__mark {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-top: 5px;
}
.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform var(--t), opacity var(--t);
}
.page-faq .qa__mark::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}
.page-faq .qa__mark::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}
.page-faq .qa[open] .qa__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__a {
  padding: 2px 16px 18px 46px;
  border-top: 1px dashed var(--board);
  margin-top: 0;
  padding-top: 14px;
  font-size: 15px;
  line-height: 1.92;
  color: var(--text-body);
  animation: faq-in 240ms var(--ease) both;
}
.page-faq .qa__a p {
  margin: 0 0 10px;
}
.page-faq .qa__a p:last-child {
  margin-bottom: 0;
}

@keyframes faq-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 步骤清单 ---------- */
.page-faq .steps {
  counter-reset: step;
  margin: 12px 0 14px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.page-faq .steps li {
  position: relative;
  padding-left: 38px;
  font-size: 14.5px;
  line-height: 1.85;
}
.page-faq .steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  padding: 1px 5px;
  border: 1px solid var(--board);
  border-radius: 2px;
  background: rgba(11, 20, 16, 0.8);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

/* ---------- 下一步 ---------- */
.page-faq .qa__next {
  margin: 14px 0 0;
  padding: 11px 13px;
  border-left: 2px solid var(--orange);
  background: rgba(255, 106, 31, 0.07);
  font-size: 14px;
  line-height: 1.85;
  color: var(--white);
}
.page-faq .qa__next b {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-close {
  margin-top: 8px;
  padding: 26px 20px 28px;
  border: 1px solid var(--board);
  border-radius: var(--faq-radius);
  background:
    linear-gradient(135deg, rgba(200, 246, 46, 0.08), transparent 46%),
    var(--board);
  box-shadow: var(--shadow-lift);
}
.page-faq .faq-close .label--lime {
  display: inline-block;
  padding: 3px 9px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.page-faq .faq-close__title {
  margin: 14px 0 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 1.95rem);
  line-height: 1.22;
  color: var(--white);
}
.page-faq .faq-close__lead {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.92;
  color: var(--text-body);
}
.page-faq .faq-close__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.page-faq .faq-close__meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(91, 122, 110, 0.35);
}
.page-faq .faq-close__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--lime);
}
.page-faq .faq-close__meta dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--white);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-hero__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-close {
    padding: 32px 30px 34px;
  }
  .page-faq .faq-close__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .qa__q {
    padding: 18px 22px 17px;
    font-size: 16px;
  }
  .page-faq .qa__a {
    padding: 16px 22px 20px 56px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-index__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding-bottom: 26px;
  }
  .page-faq .faq-index__card:nth-child(even) {
    transform: translateY(26px);
  }
  .page-faq .faq-index__card:nth-child(even):hover,
  .page-faq .faq-index__card:nth-child(even):focus-visible {
    transform: translateY(22px);
  }
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: 48px;
    padding-block: 56px 92px;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + var(--ticker-h) + 20px);
  }
  .page-faq .faq-group--split {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 26px;
  }
  .page-faq .faq-close {
    padding: 38px 40px 40px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-body {
    gap: 62px;
  }
  .page-faq .faq-group--split {
    grid-template-columns: minmax(0, 1fr) 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__a {
    animation: none;
  }
  .page-faq .faq-index__card,
  .page-faq .faq-index__card:nth-child(even),
  .page-faq .faq-index__card:nth-child(even):hover,
  .page-faq .qa {
    transition: none;
    transform: none;
  }
  .page-faq .faq-index__card:hover,
  .page-faq .faq-index__card:focus-visible {
    transform: none;
  }
}
</main>