.page-faq {
  --faq-rule: rgba(30, 90, 74, 0.7);
  --faq-rule-soft: rgba(30, 90, 74, 0.34);
  --faq-sheet: rgba(18, 59, 53, 0.4);
  display: block;
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.6rem, 4.6vw, 4rem) 0 clamp(2rem, 5vw, 4rem);
  border-bottom: 1px solid var(--faq-rule);
  background:
    radial-gradient(880px 440px at 88% -10%, rgba(30, 90, 74, 0.78), transparent 70%),
    radial-gradient(560px 380px at -8% 112%, rgba(255, 61, 127, 0.1), transparent 72%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(198, 255, 74, 0.05) 0 1px,
    transparent 1px 92px
  );
  opacity: 0.55;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: center;
}

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

.page-faq .faq-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 1.1rem 0 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .faq-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--lime);
  opacity: 0.75;
}

.page-faq .faq-hero__title {
  margin: 0 0 1rem;
  max-width: 15ch;
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__title em {
  font-style: normal;
  color: var(--lime);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 48ch;
  font-size: var(--step-0);
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__quick a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--faq-rule-soft);
  background: rgba(16, 20, 20, 0.5);
  color: var(--text);
  font-size: var(--step--1);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-hero__quick a:hover,
.page-faq .faq-hero__quick a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(198, 255, 74, 0.08);
}

.page-faq .faq-hero__qnum {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--amber);
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__figure::before {
  content: "";
  position: absolute;
  top: -0.55rem;
  right: -0.55rem;
  width: 3.6rem;
  height: 3.6rem;
  border-top: 2px solid var(--amber);
  border-right: 2px solid var(--amber);
  opacity: 0.75;
  pointer-events: none;
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
  padding-top: clamp(2rem, 4.6vw, 3.5rem);
  padding-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-index {
  min-width: 0;
  align-self: start;
}

.page-faq .faq-index__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--faq-rule-soft);
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.58rem 0.7rem;
  border-left: 2px solid transparent;
  border-bottom: 1px solid var(--faq-rule-soft);
  color: var(--muted);
  font-size: var(--step--1);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--text);
  background: rgba(18, 59, 53, 0.5);
}

.page-faq .faq-index__list a[aria-current="true"],
.page-faq .faq-index__list a[aria-current="location"],
.page-faq .faq-index__list a[aria-current="page"] {
  color: var(--lime);
  border-left-color: var(--lime);
  background: rgba(198, 255, 74, 0.07);
}

.page-faq .faq-index__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--amber);
}

.page-faq .faq-index__list a[aria-current="true"] .faq-index__num,
.page-faq .faq-index__list a[aria-current="location"] .faq-index__num {
  color: var(--lime);
}

.page-faq .faq-index__foot {
  margin: 1rem 0 0;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-index__foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 74, 0.4);
}

/* ---------- 问答组 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: clamp(2rem, 4.5vw, 3.6rem);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: clamp(4.5rem, 10vw, 6rem);
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-group__idx {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.12em;
  color: var(--rose);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-faq .faq-group__note {
  margin: 0 0 1.1rem;
  max-width: 62ch;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 单条问答 ---------- */

.page-faq .qa {
  margin-bottom: 0.45rem;
  border: 1px solid var(--faq-rule-soft);
  border-left: 2px solid var(--faq-rule);
  background: linear-gradient(180deg, rgba(18, 59, 53, 0.3), rgba(16, 20, 20, 0.52));
  transition: border-color 0.22s ease, background 0.22s ease;
}

.page-faq .qa:hover {
  border-color: rgba(30, 90, 74, 0.85);
}

.page-faq .qa[open] {
  border-left-color: var(--lime);
  background: linear-gradient(180deg, rgba(18, 59, 53, 0.62), rgba(16, 20, 20, 0.62));
}

.page-faq .qa__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.85rem 0.95rem;
  cursor: pointer;
  list-style: none;
  color: var(--text);
}

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

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

.page-faq .qa__num {
  flex: none;
  min-width: 1.85rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 700;
  color: var(--amber);
}

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

.page-faq .qa__q {
  flex: 1 1 auto;
  font-size: var(--step-0);
  font-weight: 500;
  line-height: 1.55;
}

.page-faq .qa__mark {
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: 0.3rem;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.24s ease, border-color 0.24s ease;
}

.page-faq .qa[open] .qa__mark {
  border-color: var(--lime);
  transform: rotate(225deg);
}

.page-faq .qa__body {
  padding: 0 0.95rem 1.05rem;
  border-top: 1px solid var(--faq-rule-soft);
  padding-top: 0.8rem;
  font-size: var(--step-0);
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .qa__body p {
  margin: 0;
  max-width: 64ch;
}

.page-faq .qa__body a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 74, 0.42);
}

.page-faq .qa__body a:hover {
  border-bottom-color: var(--lime);
}

.page-faq .faq-stats__figure {
  margin: 1.1rem 0 1.5rem;
}

/* ---------- 结尾行动区 ---------- */

.page-faq .faq-cta {
  border-top: 1px solid var(--faq-rule);
  background:
    linear-gradient(90deg, rgba(255, 61, 127, 0.1), rgba(198, 255, 74, 0.07) 52%, transparent 84%),
    var(--ink-950);
  padding: clamp(2rem, 5vw, 3.6rem) 0;
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 0.7rem;
}

.page-faq .faq-cta__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rose);
}

.page-faq .faq-cta__title {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .faq-cta__text {
  margin: 0;
  max-width: 58ch;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.page-faq .faq-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-hero__quick {
    gap: 0.55rem;
  }

  .page-faq .qa__head {
    padding: 0.95rem 1.2rem;
  }

  .page-faq .qa__body {
    padding: 0.9rem 1.2rem 1.2rem;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-shell {
    grid-template-columns: 218px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq .faq-index {
    position: sticky;
    top: clamp(1rem, 3vw, 2rem);
  }

  .page-faq .qa__body {
    padding-left: calc(1.2rem + 2.55rem);
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 1.5rem 2rem;
  }

  .page-faq .faq-cta__eyebrow,
  .page-faq .faq-cta__title,
  .page-faq .faq-cta__text {
    grid-column: 1;
  }

  .page-faq .faq-cta__actions {
    grid-column: 2;
    grid-row: 1 / span 3;
    align-self: center;
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__mark,
  .page-faq .faq-hero__quick a,
  .page-faq .faq-index__list a {
    transition: none;
  }
}