.page-faq {
  --faq-idx-w: 236px;
  --faq-pad: clamp(16px, 2.2vw, 24px);
  --faq-radius: 3px;
  position: relative;
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: min(74vh, 660px);
  background:
    linear-gradient(112deg, rgba(18, 51, 43, .92) 0%, rgba(18, 51, 43, .5) 34%, rgba(7, 17, 15, 0) 64%),
    linear-gradient(288deg, rgba(11, 27, 43, .95) 0%, rgba(11, 27, 43, 0) 58%),
    repeating-linear-gradient(90deg, rgba(240, 247, 243, .035) 0 1px, transparent 1px 96px);
  pointer-events: none;
  z-index: 0;
}

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

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  padding-top: clamp(18px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 3.6vw, 52px) 0 clamp(30px, 4.6vw, 60px);
}

.page-faq .faq-hero__mark {
  position: absolute;
  right: clamp(-26px, -1vw, 6px);
  bottom: -0.16em;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(88px, 17vw, 196px);
  font-weight: 700;
  line-height: .78;
  letter-spacing: -.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(200, 255, 61, .2);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-faq .faq-hero__shell {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(36px, 8.2vw, 88px);
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-hero__lead strong {
  color: var(--chalk);
  font-weight: 700;
}

.page-faq .faq-hero__aside {
  padding-top: clamp(18px, 2.6vw, 26px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-faq .faq-stats__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(240, 247, 243, .13);
}

.page-faq .faq-stats__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 25px);
  line-height: 1.35;
  letter-spacing: .01em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-stats__label {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--score-gray);
}

@media (min-width: 1000px) {
  .page-faq .faq-hero__shell {
    grid-template-columns: minmax(0, 1.3fr) minmax(270px, .7fr);
    align-items: end;
  }
}

/* ---------- 主体：索引 + 问答流 ---------- */
.page-faq .faq-body {
  padding-top: clamp(10px, 2vw, 24px);
}

.page-faq .faq-index {
  margin-bottom: clamp(24px, 4vw, 34px);
}

.page-faq .faq-index__title {
  margin: 0 0 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--score-gray);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 9px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-index__list li {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.35;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-index__link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--score-gray);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--lime);
  border-color: rgba(200, 255, 61, .45);
}

@media (min-width: 900px) {
  .page-faq .faq-body__shell {
    display: grid;
    grid-template-columns: var(--faq-idx-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: clamp(16px, 3vw, 34px);
    margin-bottom: 0;
    padding-right: 16px;
    border-right: 1px solid var(--line);
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__link {
    width: 100%;
    padding: 9px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--lime);
    background: rgba(18, 51, 43, .6);
  }
}

/* ---------- 章节 ---------- */
.page-faq .faq-section {
  padding: clamp(30px, 4.6vw, 58px) 0 clamp(6px, 1.4vw, 14px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.page-faq .faq-section__head {
  display: grid;
  gap: 6px 20px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .faq-section__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  letter-spacing: .03em;
  color: rgba(200, 255, 61, .28);
  -webkit-text-stroke: 1px rgba(200, 255, 61, .7);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: .98;
  letter-spacing: -.01em;
  color: var(--chalk);
}

.page-faq .faq-section__lead {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-faq .faq-section__head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-faq .faq-section__grid {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

@media (min-width: 900px) {
  .page-faq .faq-section__grid {
    grid-template-columns: minmax(0, 1fr) minmax(230px, 316px);
    align-items: start;
  }

  .page-faq .faq-section__grid--flip {
    grid-template-columns: minmax(230px, 316px) minmax(0, 1fr);
  }

  .page-faq .faq-section__grid--flip .faq-figure {
    order: -1;
  }
}

/* ---------- 展签式问答卡 ---------- */
.page-faq .qa-stack {
  display: grid;
  gap: 12px;
}

.page-faq .qa {
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: linear-gradient(180deg, rgba(18, 51, 43, .6), rgba(11, 27, 43, .42));
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-faq .qa:hover {
  border-color: rgba(240, 247, 243, .28);
}

.page-faq .qa[open] {
  border-color: rgba(200, 255, 61, .4);
  box-shadow: inset 2px 0 0 var(--lime);
  background: linear-gradient(180deg, rgba(18, 51, 43, .92), rgba(11, 27, 43, .6));
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: clamp(15px, 2vw, 20px) var(--faq-pad);
  cursor: pointer;
  list-style: none;
}

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

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

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

.page-faq .qa__num {
  flex: none;
  width: 22px;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--lime);
}

.page-faq .qa__title {
  flex: 1 1 auto;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  line-height: 1.56;
  color: var(--chalk);
}

.page-faq .qa__mark {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 6px;
}

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

.page-faq .qa__mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-faq .qa__mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}

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

.page-faq .qa[open] .qa__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .qa__body {
  padding: 0 var(--faq-pad) clamp(16px, 2.2vw, 22px);
}

@media (min-width: 720px) {
  .page-faq .qa__body {
    padding-left: calc(var(--faq-pad) + 36px);
  }
}

.page-faq .qa__body p {
  margin: 0 0 10px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-faq .qa__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px !important;
}

.page-faq .qa__tags .tag {
  font-size: 10.5px;
}

.page-faq .faq-cta {
  padding-top: 6px;
}

/* ---------- 图片展签 ---------- */
.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: var(--stand-gray);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) contrast(1.06);
}

.page-faq .faq-figure__caption {
  display: block;
  padding: 11px 14px;
  border-top: 1px solid var(--line);
  background: rgba(7, 17, 15, .62);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.65;
  letter-spacing: .05em;
  color: var(--score-gray);
}

.page-faq .faq-figure__caption::before {
  content: "// ";
  color: var(--lime);
}

/* ---------- 底部延伸 ---------- */
.page-faq .faq-next {
  margin-top: clamp(38px, 6vw, 82px);
  padding: clamp(28px, 4vw, 52px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 27, 43, .74), rgba(7, 17, 15, .24));
}

.page-faq .faq-next__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(21px, 2.8vw, 32px);
  line-height: 1.05;
  letter-spacing: -.01em;
  color: var(--chalk);
}

.page-faq .faq-next__list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-faq .faq-next__list li {
  background: rgba(7, 17, 15, .6);
}

.page-faq .faq-next__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px clamp(14px, 2vw, 22px);
  font-size: 14.5px;
  line-height: 1.62;
  color: var(--chalk);
  text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease), padding-left .2s var(--ease);
}

.page-faq .faq-next__list a::before {
  content: "→";
  flex: none;
  font-family: var(--font-mono);
  color: var(--lime);
}

.page-faq .faq-next__list a:hover,
.page-faq .faq-next__list a:focus-visible {
  padding-left: clamp(20px, 3vw, 32px);
  background: rgba(18, 51, 43, .88);
  color: var(--lime);
}