.page-faq {
  --faq-vgap: clamp(2rem, 6vw, 3.8rem);
  --faq-panel: rgba(20, 48, 40, 0.62);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 92% at 88% 0%, rgba(51, 240, 198, 0.10) 0%, rgba(51, 240, 198, 0) 58%),
    linear-gradient(158deg, var(--ink-800) 0%, var(--ink-900) 66%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46px;
  left: 52%;
  height: 210px;
  background: linear-gradient(96deg, rgba(51, 240, 198, 0), rgba(51, 240, 198, 0.10));
  transform: skewY(-8deg);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  padding: clamp(1.5rem, 5vw, 2.4rem) 0 clamp(2.2rem, 7vw, 4rem);
}

.page-faq .faq-hero__crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: clamp(1.3rem, 4vw, 2.4rem);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-faq .faq-hero__crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-hero__crumb a:hover,
.page-faq .faq-hero__crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.8rem, 5vw, 3rem);
}

.page-faq .faq-hero__title {
  margin: 0.65rem 0 0;
  max-width: 17ch;
  font-size: clamp(1.9rem, 7.2vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 1.15rem 0 0;
  max-width: 36em;
  font-size: clamp(0.94rem, 2.4vw, 1.04rem);
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-faq .faq-stat {
  padding: 0.9rem 1rem 1rem;
  background: var(--ink-800);
}

.page-faq .faq-stat__k {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-stat__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.2;
  color: var(--paper-dim);
}

.page-faq .faq-stat__num {
  display: inline-block;
  margin-right: 0.18rem;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  padding-top: var(--faq-vgap);
  padding-bottom: var(--faq-vgap);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 5vw, 3.2rem);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-toc {
  padding-top: 0.85rem;
  border-top: 2px solid var(--cyan);
}

.page-faq .faq-toc__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc__list a {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.5rem;
  align-items: baseline;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 0.83rem;
  line-height: 1.5;
  color: var(--paper-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-toc__no {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan);
}

.page-faq .faq-toc__note {
  margin: 1rem 0 0;
  font-size: 0.73rem;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 分节 ---------- */
.page-faq .faq-sec {
  scroll-margin-top: 88px;
}

.page-faq .faq-sec + .faq-sec {
  margin-top: clamp(2.6rem, 8vw, 5rem);
}

.page-faq .faq-sec__head {
  margin-bottom: 1.3rem;
  padding-bottom: 1.05rem;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-sec__title {
  margin: 0.45rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.32rem, 4.4vw, 2.05rem);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--paper);
}

.page-faq .faq-sec__lede {
  margin: 0.6rem 0 0;
  max-width: 40em;
  font-size: 0.86rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 1.4rem;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-faq .faq-figure--square {
  max-width: 430px;
}

.page-faq .faq-figure figcaption {
  margin-top: 0.6rem;
  max-width: 40em;
  font-size: 0.73rem;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-group {
  display: grid;
  gap: 0.55rem;
}

.page-faq .qa {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--faq-panel);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .qa[open] {
  border-color: rgba(51, 240, 198, 0.38);
  background: var(--ink-800);
}

.page-faq .qa__summary {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr) 1.3rem;
  gap: 0.65rem;
  align-items: start;
  padding: 0.9rem 0.95rem;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  transition: background-color var(--dur) var(--ease);
}

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

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

.page-faq .qa__summary:hover {
  background: rgba(51, 240, 198, 0.05);
}

.page-faq .qa__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .qa__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: var(--mist);
}

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

.page-faq .qa__q {
  font-size: clamp(0.95rem, 2.5vw, 1.06rem);
  font-weight: 600;
  line-height: 1.62;
  letter-spacing: 0.002em;
  color: var(--paper);
}

.page-faq .qa__sign {
  position: relative;
  justify-self: end;
  width: 1.3rem;
  height: 1.3rem;
  margin-top: 0.2rem;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 1px;
  background: var(--cyan);
}

.page-faq .qa__sign::before {
  width: 0.72rem;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .qa__sign::after {
  width: 1.5px;
  height: 0.72rem;
  transform: translate(-50%, -50%);
  transition: transform var(--dur) var(--ease);
}

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

.page-faq .qa__body {
  margin: 0 0.95rem 1.05rem;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--line-soft);
  max-width: 46em;
  font-size: 0.88rem;
  line-height: 1.95;
  color: var(--paper-dim);
}

.page-faq .qa__body p {
  margin: 0 0 0.7rem;
}

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

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 240, 198, 0.42);
}

.page-faq .qa__body a:hover,
.page-faq .qa__body a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-faq .qa__body .cond {
  font-size: 0.81rem;
  line-height: 1.95;
  color: var(--mist);
}

.page-faq .qa__body .qa__meta {
  margin: 0.75rem 0 0;
  padding-left: 0.7rem;
  border-left: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.85;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-faq .hl {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--gold);
}

/* ---------- 尾部提示 ---------- */
.page-faq .faq-foot {
  margin-top: clamp(2.4rem, 7vw, 4rem);
  padding: clamp(1.3rem, 4vw, 2rem);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  background: linear-gradient(120deg, rgba(20, 48, 40, 0.72), rgba(14, 33, 28, 0.42));
}

.page-faq .faq-foot p {
  margin: 0;
  max-width: 42em;
  font-size: 0.89rem;
  line-height: 1.9;
  color: var(--paper-dim);
}

.page-faq .faq-foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.15rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .qa__body {
    padding-left: 2.65rem;
  }
}

@media (min-width: 760px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.6fr);
    align-items: end;
  }

  .page-faq .faq-layout {
    grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 84px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__summary,
  .page-faq .qa__sign::after,
  .page-faq .faq-toc__list a,
  .page-faq .faq-hero__crumb a {
    transition: none;
  }
}