.page-faq {
  --faq-index-w: 268px;
  --faq-body-gap: 44px;
}

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-top: 32px;
  padding-bottom: 40px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -12%;
  width: 58%;
  height: 150%;
  background: linear-gradient(205deg, var(--red) 0%, var(--red-deep) 72%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 78%);
  opacity: .62;
  z-index: 0;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 44, 49, .85) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 44, 49, .85) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .38;
  z-index: 0;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__kicker {
  margin: 22px 0 14px;
  color: var(--copper);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 20px;
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 17em;
  font-family: var(--sans);
  font-size: clamp(30px, 7vw, 62px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-hero .lead {
  max-width: 40em;
  margin: 18px 0 0;
  color: var(--gray);
  font-size: 16px;
  line-height: 1.78;
}

.page-faq .faq-hero__note {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--copper);
  border-left: 1px solid var(--red);
  padding-left: 12px;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel);
}

.page-faq .faq-stat__num {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--copper);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

/* 主体双栏 */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-body-gap);
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  color: var(--gray);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 1px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--line);
}

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: grid;
  gap: 4px;
  min-width: 176px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--white);
  border-left: 2px solid transparent;
  border-bottom: 1px solid var(--line);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--red);
  background: var(--panel);
}

.page-faq .faq-index__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--copper);
}

.page-faq .faq-index__text {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}

.page-faq .faq-index__hint {
  font-size: 12px;
  line-height: 1.5;
  color: var(--gray);
}

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

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

.page-faq .faq-group__head {
  display: grid;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--red);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(22px, 4.6vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--white);
}

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

.page-faq .faq-list {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item {
  border-top: 1px solid var(--line);
}

.page-faq .faq-item:first-child {
  border-top: 0;
}

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1.1;
  color: var(--gray);
  transition: color 180ms var(--ease);
}

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

.page-faq .faq-item__num {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--copper);
}

.page-faq .faq-item__q {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
  transition: color 180ms var(--ease);
}

.page-faq .faq-item > summary:hover .faq-item__q {
  color: var(--copper);
}

.page-faq .faq-item[open] > summary .faq-item__q {
  color: var(--copper);
}

.page-faq .faq-item__body {
  position: relative;
  padding: 0 0 22px 20px;
}

.page-faq .faq-item__body::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 22px;
  width: 1px;
  background: var(--red);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 320ms var(--ease);
}

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

.page-faq .faq-item__body > p {
  max-width: 62ch;
  margin: 0 0 12px;
  color: var(--gray);
  font-size: 15.5px;
  line-height: 1.78;
}

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

.page-faq .faq-item__foot {
  margin-top: 12px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px !important;
  color: var(--gray);
}

.page-faq .faq-inline-link {
  color: var(--copper);
  text-decoration: none;
  border-bottom: 1px solid rgba(192, 138, 62, .45);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

/* 材料清单 */
.page-faq .faq-checklist {
  margin: 14px 0 18px;
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-faq .faq-checklist .mono-label {
  color: var(--copper);
}

.page-faq .faq-checklist ul {
  display: grid;
  gap: 9px;
  margin: 14px 0 16px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-checklist li {
  position: relative;
  padding-left: 26px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--white);
}

.page-faq .faq-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 12px;
  height: 12px;
  border: 1px solid var(--copper);
}

.page-faq .faq-checklist li:hover::before {
  background: var(--red);
  border-color: var(--red);
}

/* 图片 */
.page-faq .faq-figure {
  margin: 20px 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure .media-frame__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

/* 术语表 */
.page-faq .faq-terms {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-top: 0;
}

.page-faq .faq-term {
  padding: 16px 18px;
  background: var(--ink);
  transition: background-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-faq .faq-term:hover {
  background: var(--panel-2);
  box-shadow: inset 0 0 0 1px var(--copper);
}

.page-faq .faq-term dt {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--copper);
}

.page-faq .faq-term dd {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
}

.page-faq .faq-terms__foot {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

/* 结尾引导 */
.page-faq .faq-next {
  border-top: 1px solid var(--line);
}

.page-faq .faq-next__inner {
  display: grid;
  gap: 22px;
}

.page-faq .faq-next__copy h2 {
  margin: 10px 0 10px;
  font-size: clamp(22px, 4.6vw, 32px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-next__copy .note {
  max-width: 46ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray);
}

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

@media (min-width: 700px) {
  .page-faq .faq-hero {
    padding-top: 40px;
    padding-bottom: 56px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }

  .page-faq .faq-hero__note {
    writing-mode: vertical-rl;
    letter-spacing: .2em;
    border-left: 0;
    border-top: 1px solid var(--red);
    padding: 14px 0 0;
    justify-self: end;
  }

  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 44px;
  }

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

  .page-faq .faq-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    overflow-x: visible;
    padding-bottom: 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .page-faq .faq-index__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__link {
    min-width: 0;
    padding: 14px 14px 14px 16px;
    border-bottom: 0;
    border-top: 1px solid var(--line);
  }

  .page-faq .faq-index__item:first-child .faq-index__link {
    border-top: 0;
  }

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

  .page-faq .faq-item > summary {
    padding: 20px 0;
  }

  .page-faq .faq-terms {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-index {
    --faq-index-w: 292px;
  }

  .page-faq .faq-item__body {
    padding-left: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__body::before,
  .page-faq .faq-index__link,
  .page-faq .faq-term,
  .page-faq .faq-item__q,
  .page-faq .faq-item > summary::after {
    transition: none;
  }

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