.page-faq {
  --faq-index-w: 216px;
  --faq-gap: clamp(32px, 5vw, 72px);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .page-faq__hero {
  background:
    radial-gradient(125% 90% at 82% -10%, rgba(20, 81, 47, .95) 0%, rgba(7, 20, 16, 0) 58%),
    var(--ink-black);
  padding-top: calc(var(--header-h) + clamp(52px, 9vw, 104px));
  padding-bottom: clamp(44px, 7vw, 84px);
  overflow: hidden;
}

.page-faq .page-faq__title {
  margin: 18px 0 0;
  max-width: 15ch;
  font-size: clamp(34px, 6.4vw, 78px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .page-faq__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--archive);
}

.page-faq .page-faq__hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 38px;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  line-height: 1.5;
  color: var(--note);
}

.page-faq .page-faq__hero-stats li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.page-faq .page-faq__hero-stats .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-faq .page-faq__strip {
  height: 6px;
  margin-top: clamp(34px, 5vw, 56px);
  background: linear-gradient(
    90deg,
    var(--neon) 0 20%,
    var(--orange) 20% 34%,
    var(--pitch-green) 34% 72%,
    var(--line) 72% 100%
  );
}

/* ---------- 双栏骨架 ---------- */
.page-faq .page-faq__body {
  background: var(--ink-black);
}

.page-faq .page-faq__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

/* ---------- 左栏目录 ---------- */
.page-faq .page-faq__index {
  border-top: 2px solid var(--line);
  padding-top: 18px;
}

.page-faq .page-faq__index-list {
  display: grid;
  gap: 2px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .page-faq__index-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 11px 2px 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--note);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, padding-left .2s ease;
}

.page-faq .page-faq__index-link .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-faq .page-faq__index-link:hover,
.page-faq .page-faq__index-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--neon);
  padding-left: 6px;
  outline: none;
}

.page-faq .page-faq__index-note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--note);
}

.page-faq .page-faq__index-cta {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 2px solid rgba(182, 255, 60, .38);
  transition: border-color .2s ease, color .2s ease;
}

.page-faq .page-faq__index-cta:hover,
.page-faq .page-faq__index-cta:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
  outline: none;
}

/* ---------- 分组 ---------- */
.page-faq .page-faq__group {
  scroll-margin-top: calc(var(--header-h) + 28px);
  margin-bottom: clamp(46px, 7vw, 92px);
}

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

.page-faq .page-faq__group-head {
  border-top: 2px solid var(--neon);
  padding-top: 20px;
}

.page-faq .page-faq__group-title {
  margin: 12px 0 0;
  font-size: clamp(26px, 4.2vw, 46px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .page-faq__group-lede {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--note);
}

/* ---------- 问答条目 ---------- */
.page-faq .page-faq__qa-list {
  margin-top: clamp(20px, 3vw, 34px);
}

.page-faq .qa {
  border-bottom: 2px solid var(--line);
  transition: background-color .25s ease, box-shadow .25s ease;
}

.page-faq .qa[open] {
  background-color: var(--panel);
  box-shadow:
    inset 4px 0 0 0 var(--neon),
    8px 8px 0 0 rgba(14, 59, 42, .55);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 16px;
  gap: 14px;
  align-items: start;
  padding: 20px 16px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  transition: color .2s ease;
}

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

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

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

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
  color: var(--neon);
}

.page-faq .qa__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.7;
  color: var(--neon);
}

.page-faq .qa[open] .qa__num {
  color: var(--orange);
}

.page-faq .qa__mark {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 7px;
  justify-self: end;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--note);
  transition: transform .25s ease, background-color .25s ease;
}

.page-faq .qa__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .qa__mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .qa[open] .qa__mark::before {
  background: var(--neon);
}

.page-faq .qa[open] .qa__mark::after {
  transform: scaleY(0);
}

.page-faq .qa__a {
  padding: 18px 16px 24px;
  border-top: 2px solid var(--line);
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--note);
}

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

.page-faq .qa__a p + p {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

/* ---------- 配图 ---------- */
.page-faq .page-faq__figure {
  margin: clamp(22px, 3vw, 32px) 0;
  padding: 0;
  border: 2px solid var(--line);
  background-color: var(--panel);
}

.page-faq .page-faq__figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(.92) contrast(1.05);
}

.page-faq .page-faq__figure figcaption {
  padding: 12px 16px;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  line-height: 1.65;
  color: var(--note);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .page-faq__layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .page-faq__index {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    border-top: 0;
    border-left: 2px solid var(--line);
    padding-top: 4px;
    padding-left: 22px;
  }

  .page-faq .page-faq__index-list {
    gap: 0;
  }

  .page-faq .page-faq__index-link {
    border-bottom: 0;
    border-left: 3px solid transparent;
    margin-left: -25px;
    padding-left: 22px;
  }

  .page-faq .page-faq__index-link:hover,
  .page-faq .page-faq__index-link:focus-visible {
    border-left-color: var(--orange);
    border-bottom-color: transparent;
    padding-left: 26px;
  }

  .page-faq .qa__q {
    padding: 24px 24px;
    gap: 20px;
  }

  .page-faq .qa__a {
    padding: 20px 24px 28px;
  }
}

@media (min-width: 1180px) {
  .page-faq .page-faq__layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 88px;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 899px) {
  .page-faq .page-faq__index-list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--line) transparent;
  }

  .page-faq .page-faq__index-link {
    grid-template-columns: auto auto;
    border: 1px solid var(--line);
    padding: 8px 14px;
    white-space: nowrap;
    font-size: 14px;
  }

  .page-faq .page-faq__index-link:hover,
  .page-faq .page-faq__index-link:focus-visible {
    border-color: var(--neon);
    padding-left: 14px;
  }

  .page-faq .page-faq__index-note {
    margin-top: 16px;
  }
}

@media (max-width: 560px) {
  .page-faq .page-faq__hero-stats {
    gap: 12px 22px;
  }

  .page-faq .page-faq__hero-stats li {
    padding-left: 12px;
  }

  .page-faq .page-faq__hero-stats .num {
    font-size: 21px;
  }

  .page-faq .qa__q {
    grid-template-columns: auto minmax(0, 1fr) 14px;
    gap: 10px;
    padding: 18px 12px;
  }

  .page-faq .qa__a {
    padding: 16px 12px 22px;
  }

  .page-faq .qa__mark {
    width: 14px;
    height: 14px;
  }

  .page-faq .qa__mark::before {
    top: 6px;
    width: 14px;
  }

  .page-faq .qa__mark::after {
    left: 6px;
    height: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__num,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .page-faq__index-link,
  .page-faq .page-faq__index-cta {
    transition: none;
  }
}