/* ===== 答疑中心 /answers/ ===== */

.page-faq {
  --faq-idx-w: 246px;
  --faq-indent: 20px;
  padding-bottom: calc(var(--step) * 14);
}

/* ---- 首屏 ---- */

.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: calc(var(--step) * 4);
  padding: calc(var(--step) * 6) 0 calc(var(--step) * 7);
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 88px;
  height: 3px;
  background: var(--orange);
}

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

.page-faq .faq-hero__copy .h1 {
  margin: calc(var(--step) * 2) 0 0;
  max-width: 22ch;
}

.page-faq .faq-hero__copy .lede {
  margin-top: calc(var(--step) * 3);
  max-width: 46ch;
}

.page-faq .faq-hero__figure {
  margin: 0;
  aspect-ratio: 10 / 7;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--step) * 4);
  margin: calc(var(--step) * 5) 0 0;
  padding: calc(var(--step) * 4) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-faq .faq-hero__stats li {
  display: grid;
  gap: 2px;
  min-width: 64px;
}

.page-faq .faq-hero__stats .stat-num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-faq .faq-hero__stats .stat-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---- 索引 + 答案 双栏 ---- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-top: calc(var(--step) * 5);
}

/* ---- 问题索引 ---- */

.page-faq .faq-index {
  min-width: 0;
  padding-bottom: calc(var(--step) * 4);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index__head {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 calc(var(--step) * 3);
}

.page-faq .faq-index__group + .faq-index__group {
  margin-top: calc(var(--step) * 3);
}

.page-faq .faq-index__groupname {
  display: flex;
  align-items: center;
  gap: calc(var(--step));
  margin: 0 0 calc(var(--step) * 1.5);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-index__groupname::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--line);
}

.page-faq .faq-index__list {
  display: flex;
  gap: calc(var(--step) * 1.5);
  margin: 0;
  padding: 0 0 calc(var(--step));
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__link {
  display: block;
  white-space: nowrap;
  padding: 6px 10px;
  border: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.4;
  color: var(--text-soft);
  text-decoration: none;
  transition: border-color var(--ease), color var(--ease), background-color var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: var(--cyan);
  color: var(--text);
  background: rgba(0, 224, 200, 0.06);
}

/* ---- 答案画布 ---- */

.page-faq .faq-answers {
  min-width: 0;
  padding-top: calc(var(--step) * 6);
}

.page-faq .faq-group + .faq-group {
  margin-top: calc(var(--step) * 9);
  padding-top: calc(var(--step) * 9);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group__head {
  max-width: 62ch;
  margin-bottom: calc(var(--step) * 5);
}

.page-faq .faq-group__head .h2 {
  margin: calc(var(--step) * 1.5) 0 0;
}

.page-faq .faq-group__head .lede {
  margin-top: calc(var(--step) * 2);
}

.page-faq .faq-media {
  margin: 0 0 calc(var(--step) * 5);
}

/* ---- 折叠问答 ---- */

.page-faq .faq-item {
  scroll-margin-top: calc(var(--step) * 12);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: baseline;
  gap: calc(var(--step) * 1.5);
  padding: calc(var(--step) * 3) 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--muted);
  transition: color var(--ease);
}

.page-faq .faq-item[open] summary::after {
  content: "\2212";
  color: var(--cyan);
}

.page-faq .faq-item__num {
  flex: none;
  min-width: 1.9em;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.9;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-faq .faq-item__title {
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.65;
  color: var(--text);
  transition: color var(--ease);
}

.page-faq .faq-item summary:hover .faq-item__title,
.page-faq .faq-item summary:focus-visible .faq-item__title {
  color: var(--cyan);
}

.page-faq .faq-item__a {
  margin: 0 0 0 var(--faq-indent);
  padding: 0 0 calc(var(--step) * 4) calc(var(--step) * 2.5);
  border-left: 1px solid var(--line-strong);
}

.page-faq .faq-item[open] .faq-item__a {
  border-left-color: var(--cyan);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-faq .faq-item__a p + .faq-points {
  margin-top: calc(var(--step) * 2.5);
}

.page-faq .faq-points {
  display: grid;
  gap: calc(var(--step) * 1.5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-points li {
  position: relative;
  padding-left: calc(var(--step) * 3);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-faq .faq-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 12px;
  height: 1px;
  background: var(--orange);
}

/* ---- 继续了解 ---- */

.page-faq .faq-next {
  margin-top: calc(var(--step) * 12);
  padding-top: calc(var(--step) * 6);
  border-top: 1px solid var(--line-strong);
}

.page-faq .faq-next__lead {
  margin: 0 0 calc(var(--step) * 4);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-next__card {
  display: grid;
  gap: calc(var(--step));
  padding: calc(var(--step) * 3) calc(var(--step) * 3) calc(var(--step) * 4);
  background: var(--ink-800);
  text-decoration: none;
  transition: background-color var(--ease), transform var(--ease);
}

.page-faq .faq-next__card:hover,
.page-faq .faq-next__card:focus-visible {
  background: var(--ink-700);
}

.page-faq .faq-next__label {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-faq .faq-next__card:hover .faq-next__label,
.page-faq .faq-next__card:focus-visible .faq-next__label {
  color: var(--cyan);
}

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

/* ---- 桌面端 ---- */

@media (min-width: 720px) {
  .page-faq {
    --faq-indent: 38px;
  }

  .page-faq .faq-item__title {
    font-size: 1.08rem;
  }

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

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: center;
    gap: calc(var(--step) * 8);
    padding: calc(var(--step) * 9) 0 calc(var(--step) * 10);
  }

  .page-faq .faq-hero__figure {
    order: -1;
  }

  .page-faq .faq-hero__copy .lede {
    max-width: 42ch;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-idx-w) minmax(0, 1fr);
    gap: calc(var(--step) * 9);
    padding-top: calc(var(--step) * 8);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--step) * 12);
    align-self: start;
    max-height: calc(100vh - var(--step) * 20);
    overflow-y: auto;
    padding: 0;
    border-bottom: 0;
  }

  .page-faq .faq-index__group + .faq-index__group {
    margin-top: calc(var(--step) * 4);
  }

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

  .page-faq .faq-index__link {
    white-space: normal;
    border: 0;
    border-left: 1px solid var(--line);
    padding: 7px 0 7px 12px;
    font-size: 13.5px;
    color: var(--muted);
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(0, 224, 200, 0.1), transparent 72%);
    color: var(--text);
  }

  .page-faq .faq-answers {
    padding-top: 0;
  }

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

@media (min-width: 1440px) {
  .page-faq .faq-item__a {
    padding-right: calc(var(--step) * 6);
  }
}