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);
}

.band {
  position: relative;
  width: clamp(240px, 84vw, 360px);
  border-radius: 16px;
  padding: 4px;
  overflow: hidden;
  isolation: isolate;
}

.band::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: conic-gradient(from 0deg, transparent 0%, rgba(47, 109, 246, 0.95) 18%, transparent 40%);
  animation: bandSpin 2s linear infinite;
}

.band__inner {
  position: relative;
  z-index: 1;
  border-radius: calc(16px - 4px);
  background: #17141a;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.band__title {
  margin: 0;
  color: #fff7e6;
  font: 700 clamp(15px, 3.8vw, 19px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.band__cta {
  border: 0;
  border-radius: 999px;
  background: #0a4fe8;
  color: #fff7e6;
  padding: 8px 20px;
  font-weight: 600;
  font-size: clamp(11px, 2.8vw, 13px);
  line-height: 1;
}

@keyframes bandSpin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .band::before {
    animation: none !important;
  }
}