.page-faq {
  --faq-gap: 18px;
  --faq-pad: 18px;
  padding-bottom: 76px;
}

.page-faq .faq-crumb {
  padding-top: 20px;
  padding-bottom: 18px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-bottom: 38px;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: var(--faq-gap);
}

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

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  max-width: 17ch;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 8.4vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

.page-faq .faq-hero__media {
  margin: 0;
}

.page-faq .faq-hero__aside {
  border-left: 2px solid var(--lime);
  padding-left: 16px;
}

.page-faq .faq-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-hero__stat small {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mute-2);
}

.page-faq .faq-hero__aside-text {
  margin: 0;
  max-width: 36ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 常用动作带 ---------- */

.page-faq .faq-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
  padding: 26px 0 30px;
}

.page-faq .faq-band__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 16px;
}

.page-faq .faq-band__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-faq .faq-band__hint {
  margin: 0;
  font-size: 12px;
  color: var(--mute-2);
}

.page-faq .faq-actions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}

.page-faq .faq-action__link {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 58px;
  padding: 12px 15px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--paper);
  text-decoration: none;
  transition: border-color 200ms var(--ease), background 200ms var(--ease), transform 200ms var(--ease);
}

.page-faq .faq-action__link:hover,
.page-faq .faq-action__link:focus-visible {
  border-color: var(--lime);
  background: var(--card-hi);
  transform: translateY(-2px);
}

.page-faq .faq-action__ico {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  fill: none;
  stroke: var(--lime);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-faq .faq-action__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-faq .faq-action__name {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.3;
}

.page-faq .faq-action__desc {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--mute-2);
}

/* ---------- 主体：索引 + 问答 ---------- */

.page-faq .faq-body {
  padding-top: 42px;
}

.page-faq .faq-rail {
  margin-bottom: 26px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mute-2);
}

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

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 9px 12px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--mute);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-faq .faq-index__link:hover {
  color: var(--paper);
  border-color: var(--mute-2);
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--mute-2);
}

.page-faq .faq-index__link[aria-current="true"] {
  color: var(--lime);
  border-color: var(--lime-dim);
  background: var(--card-hi);
}

.page-faq .faq-index__link[aria-current="true"] .faq-index__no {
  color: var(--lime);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  background: var(--card);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .faq-item[open] {
  border-color: var(--lime-dim);
  background: var(--card-hi);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 16px;
  cursor: pointer;
  list-style: none;
  outline-offset: 2px;
}

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

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

.page-faq .faq-item__no {
  flex: 0 0 auto;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-faq .faq-item__title {
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .faq-item__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 7px;
  margin-left: 6px;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  background: var(--mute-2);
  transition: transform 220ms var(--ease), background 220ms var(--ease);
}

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

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

.page-faq .faq-item[open] .faq-item__sign::before,
.page-faq .faq-item[open] .faq-item__sign::after {
  background: var(--lime);
}

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

.page-faq .faq-item__a {
  margin: 0 14px 14px;
  padding: 16px 16px 14px;
  background: rgba(217, 228, 223, 0.055);
  border-top: 1px solid var(--line);
  animation: faqReveal 240ms var(--ease) both;
}

@keyframes faqReveal {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .faq-item__a p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mute);
}

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

.page-faq .faq-item__a strong {
  font-weight: 600;
  color: var(--paper);
}

.page-faq .faq-item__a a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-dim);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-faq .faq-item__a a:hover {
  color: var(--paper);
  border-color: var(--paper);
}

.page-faq .faq-item__cols {
  display: grid;
  gap: 16px;
}

.page-faq .faq-item__media {
  margin: 4px 0 0;
}

/* ---------- 平板 ---------- */

@media (min-width: 620px) {
  .page-faq {
    --faq-gap: 22px;
  }

  .page-faq .faq-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-item__q {
    padding: 18px 20px;
  }

  .page-faq .faq-item__a {
    margin: 0 18px 18px;
    padding: 18px 20px 16px;
  }

  .page-faq .faq-item__cols {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-faq {
    --faq-pad: 24px;
  }

  .page-faq .faq-hero {
    padding-bottom: 54px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas:
      "intro media"
      "aside media";
    column-gap: 52px;
    row-gap: 30px;
    align-items: start;
  }

  .page-faq .faq-hero__intro { grid-area: intro; }
  .page-faq .faq-hero__media { grid-area: media; }
  .page-faq .faq-hero__aside {
    grid-area: aside;
    align-self: end;
  }

  .page-faq .faq-actions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-body {
    display: grid;
    grid-template-columns: 228px minmax(0, 1fr);
    column-gap: 58px;
    align-items: start;
    padding-top: 52px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 26px;
    margin-bottom: 0;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 18px;
  }

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

  .page-faq .faq-index__link {
    border: 0;
    background: transparent;
    padding: 8px 0;
    font-size: 14px;
  }

  .page-faq .faq-index__link:hover {
    border-color: transparent;
    background: transparent;
  }

  .page-faq .faq-index__link[aria-current="true"] {
    background: transparent;
    border-color: transparent;
    color: var(--lime);
    font-weight: 700;
  }

  .page-faq .faq-item__cols {
    grid-template-columns: minmax(0, 1fr) 260px;
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-body {
    grid-template-columns: 248px minmax(0, 1fr);
    column-gap: 72px;
  }

  .page-faq .faq-item__title {
    font-size: 18px;
  }

  .page-faq .faq-item__a p {
    font-size: 15.5px;
    max-width: 44em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

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