.page-faq {
  --faq-line: rgba(31, 122, 106, .38);
  --faq-answer-bg: rgba(14, 42, 42, .55);
  --faq-hair: rgba(23, 54, 74, .9);
  display: block;
  background: var(--ink);
  color: var(--mist);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-head {
  position: relative;
  padding-top: calc(var(--unit) * 1.4);
  padding-bottom: calc(var(--unit) * 0.8);
}

.page-faq .faq-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 84px 84px;
  opacity: .28;
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-head > * {
  position: relative;
  z-index: 1;
}

.page-faq .faq-head .breadcrumbs {
  margin-bottom: 34px;
}

.page-faq .faq-head .eyebrow {
  margin: 0 0 16px;
  letter-spacing: .14em;
}

.page-faq .faq-head h1 {
  margin: 0 0 24px;
  max-width: 18ch;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--mist);
  overflow-wrap: break-word;
}

.page-faq .faq-head .lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.75vw, 17px);
  line-height: 1.78;
  color: var(--graphite);
}

/* ---------- 顶部横幅 ---------- */

.page-faq .faq-banner {
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.page-faq .faq-banner .media-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06);
}

.page-faq .media-frame__caption {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--graphite);
}

/* ---------- 问题分类导航 ---------- */

.page-faq .faq-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 12px clamp(18px, 3.4vw, 44px);
  padding-top: calc(var(--unit) * 0.9);
  padding-bottom: calc(var(--unit) * 0.7);
}

.page-faq .faq-toc__link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--graphite);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link[data-active] {
  color: var(--jade-2);
  border-bottom-color: var(--jade-2);
}

/* ---------- 章节骨架 ---------- */

.page-faq .faq-chapter {
  border-top: 1px solid var(--faq-line);
  padding-block: calc(var(--unit) * 1.1);
}

.page-faq .faq-chapter__inner {
  display: grid;
  gap: 26px;
  min-width: 0;
}

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

.page-faq .faq-chapter__side h2 {
  margin: 12px 0 0;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.005em;
  color: var(--mist);
}

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

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

/* ---------- 问答条目 ---------- */

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

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--mist);
  transition: color 200ms var(--ease);
}

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

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

.page-faq .qa__q:hover {
  color: var(--jade-2);
}

.page-faq .qa__q::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 8px;
  border-right: 1.5px solid var(--jade-2);
  border-bottom: 1.5px solid var(--jade-2);
  transform: rotate(45deg);
  transition: transform 220ms var(--ease), border-color 220ms var(--ease);
}

.page-faq .qa[open] .qa__q {
  color: var(--jade-2);
}

.page-faq .qa[open] .qa__q::after {
  transform: rotate(-135deg);
  border-color: var(--flare);
}

.page-faq .qa__a {
  margin: 0 0 22px;
  padding: 16px 18px 18px 20px;
  background: var(--faq-answer-bg);
  border-left: 2px solid var(--jade);
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.78;
  overflow-wrap: break-word;
}

.page-faq .qa__a a,
.page-faq .faq-final__copy a {
  color: var(--jade-2);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 180ms var(--ease);
}

.page-faq .qa__a a:hover,
.page-faq .faq-final__copy a:hover {
  color: var(--flare);
}

/* ---------- 图文分栏 ---------- */

.page-faq .faq-chapter__body--split {
  display: grid;
  gap: 34px;
  min-width: 0;
}

.page-faq .faq-figure {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-figure .media-frame {
  overflow: hidden;
  background: var(--ink-2);
  border-left: 2px solid var(--gold);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.9) contrast(1.04);
}

/* ---------- 结尾引导 ---------- */

.page-faq .faq-final {
  border-top: 1px solid var(--faq-line);
  padding-block: calc(var(--unit) * 1.3) calc(var(--unit) * 1.8);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(31, 122, 106, .18), transparent 62%),
    var(--ink);
}

.page-faq .faq-final__inner {
  display: grid;
  gap: 30px;
  min-width: 0;
}

.page-faq .faq-final__copy h2 {
  margin: 12px 0 18px;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.18;
  font-weight: 800;
  color: var(--mist);
}

.page-faq .faq-final__copy p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--graphite);
}

.page-faq .faq-final__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

/* ---------- 中大屏 ---------- */

@media (min-width: 760px) {
  .page-faq .faq-chapter__inner {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 24px;
  }

  .page-faq .faq-chapter__side {
    grid-column: 1 / span 3;
  }

  .page-faq .faq-chapter__body {
    grid-column: 5 / span 7;
  }

  .page-faq .faq-final__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 56px;
    align-items: end;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-chapter {
    padding-block: calc(var(--unit) * 1.8);
  }

  .page-faq .faq-chapter__side {
    grid-column: 2 / span 3;
  }

  .page-faq .faq-chapter__body {
    grid-column: 5 / span 7;
  }

  .page-faq .faq-chapter__side h2 {
    margin-top: 16px;
  }

  .page-faq .faq-chapter__body--split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    column-gap: 44px;
    align-items: start;
  }
}

@media (min-width: 1320px) {
  .page-faq .faq-chapter__side {
    grid-column: 2 / span 3;
  }

  .page-faq .faq-chapter__body {
    grid-column: 6 / span 6;
  }
}

/* ---------- 窄屏收敛 ---------- */

@media (max-width: 759px) {
  .page-faq .faq-head {
    padding-top: calc(var(--unit) * 1.1);
  }

  .page-faq .faq-head h1 {
    max-width: 100%;
  }

  .page-faq .faq-head .breadcrumbs {
    margin-bottom: 24px;
  }

  .page-faq .qa__q {
    padding: 17px 0;
  }

  .page-faq .qa__a {
    margin-bottom: 18px;
    padding: 14px 14px 16px 16px;
    font-size: 14.5px;
  }

  .page-faq .faq-final__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__q,
  .page-faq .qa__q::after,
  .page-faq .faq-toc__link {
    transition: none;
  }
}