*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial}
#app{min-height:100%;background:transparent;color:inherit}
.qna-inner{width:100%}
.blank{width:100%;height:40vh}

/* --- Ad Styles --- */
.ads-block { padding: 12px; text-align: center; margin-top: 80vh; width: 100%; margin-bottom: 40px; }
.ads-title { font-weight: 700; margin-bottom: 8px; opacity: 0.7; }
.ad-slot {
  display: block;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  overflow: hidden;
  position: relative;
  margin: 0 auto;
  width: 100%;
  max-width: 300px;
  aspect-ratio: 300/250;
}
.ad-banner { width: 100%; max-width: 300px; aspect-ratio: 300/250; }
.ad-slot::before {
  content: "AD";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, 0.3);
  font-weight: 700;
  letter-spacing: 2px;
  z-index: 0;
}
.ad-slot > * {
  position: relative;
  z-index: 1;
}