.page-faq {
  --faq-side: 216px;
  --faq-radius: 2px;
}

.page-faq .breadcrumbs {
  padding-block: 18px 0;
}

.page-faq .faq-hero {
  padding-block: clamp(18px, 3vw, 30px) clamp(22px, 3.4vw, 38px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero .kicker {
  color: var(--red-soft);
}

.page-faq .faq-hero .display {
  margin: 10px 0 14px;
  max-width: 20ch;
  color: var(--paper);
}

.page-faq .faq-hero .lede {
  max-width: 64ch;
  color: var(--mist);
}

/* ---------- 布局：左锚点 / 右问答 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding-block: clamp(24px, 4vw, 48px) clamp(40px, 6vw, 72px);
}

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

.page-faq .faq-side-title {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-faq .faq-anchors {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-anchor {
  flex: 0 0 auto;
  display: block;
  padding: 9px 14px;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}

.page-faq .faq-anchor:hover,
.page-faq .faq-anchor:focus-visible {
  color: var(--paper);
  border-color: var(--teal);
  outline: none;
}

.page-faq .faq-anchor.is-current {
  color: var(--amber);
  border-color: var(--amber-deep);
  background: rgba(242, 178, 62, .08);
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-side) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-faq .faq-side {
    position: sticky;
    top: 104px;
    align-self: start;
  }

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

  .page-faq .faq-anchor {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 10px 12px;
  }

  .page-faq .faq-anchor.is-current {
    background: linear-gradient(90deg, rgba(192, 73, 43, .16), rgba(192, 73, 43, 0));
    border-left-color: var(--red);
    color: var(--amber);
  }
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-group {
  margin-bottom: clamp(34px, 5vw, 60px);
  scroll-margin-top: 108px;
}

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

.page-faq .faq-group-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group-num {
  flex: 0 0 auto;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--paper);
  background: var(--red);
  border-radius: var(--faq-radius);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-size: clamp(19px, 2.3vw, 25px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-diagram {
  flex: 0 0 auto;
  margin-left: auto;
  width: 104px;
  height: auto;
  color: var(--mist);
}

.page-faq .faq-group-lede {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .image-frame {
  margin: 0 0 18px;
}

.page-faq .figure-note {
  color: var(--mist);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  display: block;
}

.page-faq .faq-item {
  position: relative;
  margin: 0 0 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  transition: border-color .16s ease;
}

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

.page-faq .faq-item[open] {
  border-color: rgba(192, 73, 43, .55);
}

.page-faq .faq-item[open]::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--red);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

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

.page-faq .faq-item summary::before {
  content: "";
  flex: 0 0 auto;
  width: 0;
  height: 0;
  margin-top: 7px;
  border-left: 6px solid var(--teal-soft);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transition: transform .18s ease, border-left-color .18s ease;
}

.page-faq .faq-item[open] summary::before {
  transform: rotate(90deg);
  border-left-color: var(--amber);
}

.page-faq .faq-item summary:hover {
  color: var(--amber);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}

.page-faq .faq-a {
  padding: 0 16px 16px 34px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-a p {
  margin: 0;
}

.page-faq .faq-a a {
  color: var(--teal-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--amber);
}

.page-faq .kw {
  display: inline-block;
  padding: 1px 6px;
  margin: 0 2px;
  font-size: .9em;
  font-weight: 700;
  line-height: 1.5;
  white-space: nowrap;
  color: var(--ink);
  background: var(--teal-soft);
  border-radius: var(--faq-radius);
}

@media (max-width: 560px) {
  .page-faq .faq-group-head {
    flex-wrap: wrap;
    gap: 10px;
  }

  .page-faq .faq-diagram {
    width: 80px;
  }

  .page-faq .faq-item summary {
    font-size: 15px;
    padding: 13px 14px;
  }

  .page-faq .faq-a {
    padding: 0 14px 14px 32px;
    font-size: 14.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-anchor,
  .page-faq .faq-item,
  .page-faq .faq-item summary::before {
    transition: none;
  }
}