.page-faq {
  --faq-rail: 300px;
  --faq-gap: clamp(1.5rem, 3vw, 3rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(2rem, 5vw, 3.75rem);
  padding-bottom: clamp(2rem, 4vw, 3.25rem);
  border-bottom: 1px solid var(--cv-grid);
  background:
    radial-gradient(880px 420px at 84% -12%, rgba(47, 212, 232, 0.16), transparent 62%),
    radial-gradient(620px 340px at 6% 0%, rgba(138, 92, 255, 0.15), transparent 66%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(29, 60, 97, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 60, 97, 0.5) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 86%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 86%);
}

.page-faq .faq-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__kicker {
  margin: 1.15rem 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--cv-cyan);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 5.6vw, 3.6rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--cv-ink);
}

.page-faq .faq-hero__lead {
  margin: 1.25rem 0 0;
  max-width: 62ch;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.8;
  color: var(--cv-muted);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.6rem;
}

/* ---------- 双栏主体 ---------- */
.page-faq .faq-body {
  padding-top: clamp(1.75rem, 4vw, 3rem);
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-side__sticky {
  display: grid;
  gap: 1rem;
}

.page-faq .faq-side__figure {
  margin: 0;
}

.page-faq .faq-side__figure img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--cv-night);
  clip-path: var(--cut-poly);
  object-fit: cover;
}

.page-faq .faq-side__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cv-dim);
}

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--cv-grid);
}

.page-faq .faq-index li {
  border-bottom: 1px solid var(--cv-grid);
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.7rem 0.5rem 0.7rem 0.2rem;
  font-size: 0.94rem;
  color: var(--cv-muted);
  text-decoration: none;
  transition: color 0.22s var(--ease), padding-left 0.22s var(--ease), background 0.22s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--cv-ink);
  outline: none;
}

.page-faq .faq-index__link:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cv-cyan);
}

.page-faq .faq-index__link.is-current {
  padding-left: 0.85rem;
  color: var(--cv-cyan);
  background: linear-gradient(90deg, rgba(47, 212, 232, 0.14), rgba(47, 212, 232, 0) 78%);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cv-dim);
}

.page-faq .faq-index__link.is-current .faq-index__num {
  color: var(--cv-lime);
}

/* ---------- 问答分组 ---------- */
.page-faq .qa-group {
  padding-bottom: clamp(1.75rem, 3.6vw, 3rem);
  margin-bottom: clamp(1.75rem, 3.6vw, 3rem);
  border-bottom: 1px solid var(--cv-grid);
}

.page-faq .qa-group:last-child {
  margin-bottom: 0;
  border-bottom: 0;
}

.page-faq .qa-group__head {
  display: grid;
  grid-template-columns: 2.9rem minmax(0, 1fr);
  align-items: baseline;
  column-gap: 0.9rem;
  margin-bottom: 1.35rem;
}

.page-faq .qa-group__num {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  line-height: 1;
  color: var(--cv-cyan);
  letter-spacing: 0.04em;
}

.page-faq .qa-group__title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 3.2vw, 1.95rem);
  line-height: 1.2;
  color: var(--cv-ink);
}

.page-faq .qa-group__sub {
  grid-column: 2;
  margin: 0.45rem 0 0;
  font-size: 0.9rem;
  color: var(--cv-dim);
}

.page-faq .qa {
  position: relative;
  margin-bottom: 0.85rem;
  padding: 1.1rem 1.25rem 1.2rem;
  background: linear-gradient(180deg, rgba(18, 49, 82, 0.92), rgba(12, 38, 68, 0.92));
  clip-path: var(--cut-poly);
}

.page-faq .qa::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--cv-cyan);
}

.page-faq .qa--violet::after {
  background: var(--cv-violet);
}

.page-faq .qa__q {
  margin: 0 0 0.7rem;
  font-size: clamp(1rem, 1.8vw, 1.1rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--cv-ink);
}

.page-faq .qa__a {
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--cv-muted);
}

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

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

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

.page-faq .qa__points li {
  position: relative;
  padding-left: 1.1rem;
  margin-bottom: 0.45rem;
}

.page-faq .qa__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cv-lime);
}

.page-faq .qa__note {
  margin: 0.85rem 0 0;
}

.page-faq .faq-inline-link {
  color: var(--cv-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 232, 0.42);
  font-size: 0.9rem;
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  border-bottom-color: var(--cv-cyan);
  outline: none;
}

/* ---------- 路径条 ---------- */
.page-faq .path-strip {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.9rem 0 0.9rem;
  padding: 0;
}

.page-faq .path-strip__step {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.42rem 0.75rem;
  font-size: 0.82rem;
  color: var(--cv-ink);
  background: rgba(12, 38, 68, 0.85);
  border: 1px solid var(--cv-grid);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.page-faq .path-strip__step:first-child {
  border-color: rgba(47, 212, 232, 0.6);
  color: var(--cv-cyan);
}

.page-faq .path-strip__idx {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cv-dim);
}

.page-faq .path-strip__step:first-child .path-strip__idx {
  color: var(--cv-cyan);
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0.35rem 0 1.15rem;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--cv-night);
  clip-path: var(--cut-poly);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--cv-dim);
}

/* ---------- 底部行动区 ---------- */
.page-faq .faq-cta {
  border-top: 1px solid var(--cv-grid);
  background:
    radial-gradient(700px 300px at 88% 120%, rgba(183, 245, 71, 0.1), transparent 68%),
    rgba(12, 38, 68, 0.55);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 1.35rem;
  align-items: center;
}

.page-faq .faq-cta__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  line-height: 1.25;
  color: var(--cv-ink);
}

.page-faq .faq-cta__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--cv-muted);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

/* ---------- 返回顶部 ---------- */
.page-faq .to-top {
  position: fixed;
  right: 1.15rem;
  bottom: 1.15rem;
  z-index: 45;
  padding: 0.6rem 0.95rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cv-ink);
  background: rgba(12, 38, 68, 0.94);
  border: 1px solid var(--cv-cyan);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
  transform: translateY(8px);
}

.page-faq .to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.page-faq .to-top:focus-visible {
  outline: 2px solid var(--cv-lime);
  outline-offset: 3px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
  }

  .page-faq .faq-side__sticky {
    position: sticky;
    top: calc(var(--topbar-h) + 1.75rem);
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1.6fr) auto;
  }

  .page-faq .faq-cta__actions {
    justify-content: flex-end;
  }
}

@media (max-width: 899px) {
  .page-faq .faq-side__figure img {
    height: 220px;
    object-fit: cover;
  }

  .page-faq .qa {
    padding: 1rem 1rem 1.1rem;
  }

  .page-faq .qa-group__head {
    grid-template-columns: 2.3rem minmax(0, 1fr);
    column-gap: 0.7rem;
  }
}