.page-faq {
  --faq-index-w: 232px;
  padding-bottom: 96px;
}

/* ---------- hero ---------- */
.page-faq .faq-hero {
  padding-top: 28px;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 16px;
  padding-bottom: 30px;
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(34px, 6.4vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--flash-white);
  margin: 0;
  max-width: 17ch;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist-100);
  opacity: 0.9;
}

.page-faq .faq-hero__media {
  margin-top: 6px;
}

/* ---------- 主体网格 ---------- */
.page-faq .faq-body {
  padding-top: 60px;
}

.page-faq .faq-body__grid {
  display: grid;
  gap: 40px;
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index__label {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan-signal);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line-hair);
  border-radius: 2px;
  background: var(--ink-850);
  color: var(--mist-100);
  font-size: 14px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background 160ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--cyan-signal);
  color: var(--cyan-signal);
  background: var(--ink-750);
  outline: none;
}

.page-faq .faq-index__num {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan-signal);
}

.page-faq .faq-index__hint {
  display: none;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  margin-bottom: 56px;
}

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

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 16px;
  row-gap: 8px;
  align-items: baseline;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-hair);
  margin-bottom: 4px;
}

.page-faq .faq-group__num {
  font-family: var(--font-num);
  font-size: 32px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan-signal);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3.2vw, 36px);
  letter-spacing: 0.01em;
  color: var(--flash-white);
  line-height: 1.15;
}

.page-faq .faq-group__desc {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--violet-haze);
}

/* ---------- 单条问答 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line-hair);
  transition: border-color 180ms var(--ease);
}

.page-faq .faq-item[open] {
  border-bottom-color: rgba(43, 227, 210, 0.42);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--mist-100);
  transition: color 160ms var(--ease);
}

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

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--cyan-signal);
  outline: none;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-top: 6px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan-signal);
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.page-faq .faq-item__mark::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 1.5px;
}

.page-faq .faq-item__mark::after {
  top: 0;
  left: 7px;
  width: 1.5px;
  height: 16px;
}

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

.page-faq .faq-item__a {
  padding: 0 4px 22px 34px;
  animation: faq-fade 200ms var(--ease);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-100);
  opacity: 0.86;
}

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

/* ---------- 联系收束 ---------- */
.page-faq .faq-contact {
  padding-top: 20px;
}

.page-faq .faq-contact__inner {
  display: grid;
  gap: 36px;
  border-top: 1px solid var(--line-hair);
  padding-top: 44px;
}

.page-faq .faq-contact__title {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.1;
  color: var(--flash-white);
}

.page-faq .faq-contact__copy > p {
  margin: 0 0 26px;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist-100);
  opacity: 0.9;
}

.page-faq .faq-contact__facts {
  display: grid;
  gap: 14px;
  margin: 0 0 28px;
  padding: 22px 0 0;
  border-top: 1px solid var(--line-hair);
}

.page-faq .faq-contact__facts > div {
  display: grid;
  grid-template-columns: 96px 1fr;
  align-items: baseline;
  gap: 12px;
}

.page-faq .faq-contact__facts dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--violet-haze);
}

.page-faq .faq-contact__value {
  margin: 0;
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--flash-white);
  word-break: break-word;
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-contact__media {
  max-width: 460px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-index-w) 1fr;
    column-gap: 64px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 128px;
    padding-right: 8px;
    border-right: 1px solid var(--line-hair);
  }

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

  .page-faq .faq-index__link {
    display: flex;
    width: 100%;
    border: 0;
    border-bottom: 1px solid var(--line-hair);
    border-radius: 0;
    background: transparent;
    padding: 13px 12px 13px 0;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: transparent;
    padding-left: 8px;
  }

  .page-faq .faq-index__hint {
    display: block;
    margin: 18px 0 0;
    font-size: 12px;
    line-height: 1.7;
    color: var(--violet-haze);
  }

  .page-faq .faq-contact__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    column-gap: 64px;
    align-items: start;
  }

  .page-faq .faq-contact__media {
    max-width: none;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-body__grid {
    column-gap: 88px;
  }
}

/* ---------- 窄屏收边 ---------- */
@media (max-width: 640px) {
  .page-faq {
    padding-bottom: 72px;
  }

  .page-faq .faq-body {
    padding-top: 44px;
  }

  .page-faq .faq-group {
    margin-bottom: 44px;
  }

  .page-faq .faq-item__a {
    padding-left: 30px;
  }

  .page-faq .faq-contact__facts > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .page-faq .faq-contact__actions .btn {
    width: 100%;
    justify-content: center;
  }
}

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

  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-index__link,
  .page-faq .faq-item__q {
    transition: none;
  }
}