html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  padding: clamp(8px, 3vw, 20px);
}

.card-c {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: min(240px, 78vw);
  border-radius: 16px;
  background: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-c::after {
  content: "";
  position: absolute;
  inset: -30% -10%;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.8;
  background: repeating-linear-gradient(115deg, transparent 0 18px, rgba(47, 109, 246, 0.55) 18px 30px, rgba(255, 210, 63, 0.55) 30px 42px, rgba(255, 247, 230, 0.6) 42px 54px, transparent 54px 72px);
  background-size: 200% 200%;
  animation: foilSweep 2s linear infinite;
}

.card-c__icon {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: radial-gradient(circle at 30% 30%, #fff7e6, #2f6df6 55%, #17141a 100%);
}

.card-c__title {
  position: relative;
  z-index: 1;
  margin: 0;
  color: #ffffff;
  font-weight: 700;
  font-size: clamp(13px, 3.2vw, 15px);
  line-height: 1.3;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.card-c__desc {
  position: relative;
  z-index: 1;
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
  font-size: clamp(11px, 2.6vw, 12.5px);
  line-height: 1.4;
  font-family: inherit;
}

@keyframes foilSweep {
  0% {
    background-position: 0% 0%;
  }
  100% {
    background-position: -140% -140%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .card-c::after {
    animation: none;
  }
}