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

.stage {
  min-height: 100vh;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.head {
  position: sticky;
  top: 0;
  height: 56px;
  display: flex;
  align-items: center;
  padding: 0 clamp(16px, 5vw, 24px);
  background: #17141a;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}
.head__logo {
  color: #fff7e6;
  font-weight: 800;
  font-size: 18px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}
.head__bar {
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 3px;
  background: #2f6df6;
  transform: scaleX(0);
  transform-origin: left;
}
@supports (animation-timeline: scroll()) {
  .head__bar {
    animation: fill-bar linear both;
    animation-timeline: scroll(root);
  }
}

@keyframes fill-bar {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}
.head__bar.is-demo {
  animation: fill-loop 2s linear infinite;
}

@keyframes fill-loop {
  0% {
    transform: scaleX(0);
  }
  90% {
    transform: scaleX(1);
  }
  100% {
    transform: scaleX(1);
  }
}
.page {
  padding: 28px 24px 0;
}

.page__line {
  height: 12px;
  margin: 0 0 14px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.12);
}
.page__line.short {
  width: 60%;
}

@media (prefers-reduced-motion: reduce) {
  .head__bar, .head__bar.is-demo {
    animation: none !important;
    transform: scaleX(1);
  }
}