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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.dfh {
  position: relative;
  display: flex;
  align-items: center;
  border-radius: 12px;
  background: rgba(23, 20, 26, 0.06);
  padding: 4px;
}

.dfh__btn {
  appearance: none;
  border: none;
  background: transparent;
  color: #17141a;
  font-size: 13px;
  font-weight: 700;
  padding: 8px 16px;
  cursor: pointer;
  border-radius: 8px;
  transition: background-color 220ms ease-out;
}
.dfh__btn:hover, .dfh__btn:focus-visible {
  background: rgba(23, 20, 26, 0.08);
}
.dfh__btn:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.dfh__seam {
  position: relative;
  width: 4px;
  height: 28px;
  align-self: center;
  opacity: 1;
  will-change: opacity;
}
.dfh__seam::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 4px;
  background: rgba(23, 20, 26, 0.42);
}
.dfh__seam::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 26px;
  height: 26px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: rgba(23, 20, 26, 0.14);
  filter: blur(5px);
}

@media (max-width: 340px) {
  .dfh__btn {
    font-size: 12px;
    padding: 8px 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .dfh__btn {
    transition: none;
  }
  .dfh__seam {
    opacity: 1 !important;
  }
}