.page-faq {
  --faq-gap: clamp(18px, 3vw, 30px);
  --faq-rail-w: 236px;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 58px) 0 clamp(30px, 5vw, 62px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 84% -12%, rgba(255, 138, 60, .18), transparent 58%),
    radial-gradient(90% 70% at 4% 0%, rgba(63, 224, 208, .13), transparent 60%),
    linear-gradient(180deg, var(--panel-2), var(--ink));
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(124, 138, 153, .10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 138, 153, .10) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(120% 100% at 30% 0%, #000 20%, transparent 78%);
  mask-image: radial-gradient(120% 100% at 30% 0%, #000 20%, transparent 78%);
}

.page-faq .faq-hero-inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 42px);
  align-items: start;
}

.page-faq .faq-hero-copy .crumbs {
  margin-bottom: 16px;
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 7.4vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: .01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-faq .faq-hero .lede {
  margin: 16px 0 0;
  max-width: 60ch;
  color: var(--rock);
  font-size: clamp(.98rem, 2.2vw, 1.06rem);
  line-height: 1.8;
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  background: rgba(19, 38, 58, .6);
  color: var(--paper);
  font-size: .88rem;
  text-decoration: none;
  transition: border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.page-faq .faq-jump .mono {
  font-size: .72rem;
  color: var(--cyan);
}

.page-faq .faq-hero-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--panel-2);
  box-shadow: 10px 12px 0 rgba(5, 16, 26, .55);
}

.page-faq .faq-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-hero-figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--idx);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  padding-top: clamp(30px, 5vw, 58px);
}

.page-faq .faq-rail {
  padding: 18px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(19, 38, 58, .72), rgba(14, 29, 44, .72));
}

.page-faq .faq-toc {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  color: var(--rock);
  font-size: .93rem;
  text-decoration: none;
  transition: background .2s var(--ease), color .2s var(--ease);
}

.page-faq .faq-toc a .mono {
  font-size: .72rem;
  color: var(--cyan-deep);
}

.page-faq .faq-toc a:hover,
.page-faq .faq-toc a:focus-visible {
  background: var(--panel);
  color: var(--paper);
}

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

.page-faq .faq-rail-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
  color: var(--idx);
  font-size: .82rem;
  line-height: 1.7;
}

/* ---------- 问题分组 ---------- */
.page-faq .faq-body {
  min-width: 0;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 5.5vw, 60px);
}

.page-faq .faq-group-head {
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-group-num {
  margin: 0;
  color: var(--cyan);
  font-size: .74rem;
  letter-spacing: .16em;
}

.page-faq .faq-group-head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.6vw, 1.9rem);
  line-height: 1.2;
  color: var(--paper);
}

.page-faq .faq-group-note {
  margin: 8px 0 0;
  max-width: 62ch;
  color: var(--rock);
  font-size: .93rem;
  line-height: 1.7;
}

.page-faq .qa-list {
  display: grid;
  gap: 12px;
}

.page-faq .qa {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(19, 38, 58, .88), rgba(14, 29, 44, .94));
  overflow: hidden;
  transition: border-color .22s var(--ease), transform .22s var(--ease), box-shadow .26s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-faq .qa[open] {
  border-color: var(--cyan);
  box-shadow: 0 16px 34px rgba(5, 16, 26, .5);
  transform: none;
}

.page-faq .qa summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .qa-num {
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .qa-q {
  color: var(--paper);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.55;
}

.page-faq .qa-mark {
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--rock);
  border-bottom: 2px solid var(--rock);
  transform: rotate(45deg);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

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

.page-faq .qa-a {
  padding: 18px 18px 22px;
  border-top: 1px solid var(--line-soft);
  background: var(--paper);
  color: #15212d;
  font-size: .945rem;
  line-height: 1.78;
}

.page-faq .qa-a > * + * {
  margin-top: 12px;
}

.page-faq .qa-a p {
  margin: 0;
  max-width: 68ch;
}

.page-faq .qa-a ol,
.page-faq .qa-a ul {
  margin: 0;
  padding-left: 1.35em;
  max-width: 68ch;
}

.page-faq .qa-a li {
  margin-top: 5px;
}

.page-faq .qa-a a {
  color: #0f5f57;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa-a a:hover {
  color: #0a4a44;
}

.page-faq .qa-a .mono {
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(10, 22, 34, .08);
  color: #0d3f3a;
  font-size: .86rem;
  letter-spacing: .02em;
}

/* ---------- 索引分组的错层侧图 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: var(--faq-gap);
}

.page-faq .faq-side {
  margin: 0;
  align-self: start;
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--panel-2);
  box-shadow: 8px 10px 0 rgba(5, 16, 26, .45);
}

.page-faq .faq-side img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-faq .faq-side figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--idx);
}

/* ---------- 收束 CTA ---------- */
.page-faq .faq-cta {
  position: relative;
  display: grid;
  gap: 20px;
  margin-top: clamp(42px, 6vw, 74px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(255, 138, 60, .16), transparent 55%),
    linear-gradient(180deg, var(--panel), var(--panel-2));
}

.page-faq .faq-cta::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: 180px;
  height: 180px;
  border-left: 1px solid var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-top-left-radius: var(--r-lg);
  opacity: .5;
  pointer-events: none;
}

.page-faq .faq-cta-kicker {
  margin: 0;
  color: var(--cyan);
  font-size: .74rem;
  letter-spacing: .16em;
}

.page-faq .faq-cta h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2.05rem);
  line-height: 1.18;
  color: var(--paper);
  max-width: 24ch;
}

.page-faq .faq-cta p {
  margin: 10px 0 0;
  max-width: 56ch;
  color: var(--rock);
  font-size: .94rem;
  line-height: 1.75;
}

.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 66px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 112px;
  }

  .page-faq .faq-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa-mark,
  .page-faq .faq-jump a,
  .page-faq .faq-toc a {
    transition: none;
  }

  .page-faq .qa:hover {
    transform: none;
  }
}