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

.stage {
  position: relative;
  min-height: 100vh;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sentinel {
  position: absolute;
  top: 0;
  height: 1px;
  width: 1px;
}

.photo {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(120deg, #2f6df6 0 18px, #fff7e6 18px 36px);
}

.head {
  position: sticky;
  top: 0;
  height: 56px;
  display: flex;
  align-items: center;
  padding: 0 clamp(16px, 5vw, 24px);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(0);
  transition: background 300ms ease-out, backdrop-filter 300ms ease-out;
}
.head__logo {
  color: #17141a;
  font-weight: 800;
  font-size: 18px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}
.head.is-scrolled {
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(10px);
}

.head.is-demo {
  animation: blur-loop 2s ease-out infinite;
}

@keyframes blur-loop {
  0%, 15% {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(0);
  }
  45%, 70% {
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(10px);
  }
  95%, 100% {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .head {
    transition: none;
  }
  .head.is-demo {
    animation: none !important;
    background: rgba(255, 255, 255, 0.55);
    backdrop-filter: blur(10px);
  }
}