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);
}

.kb {
  width: 100%;
  max-width: 220px;
  background: #fff7e6;
  border-radius: 16px;
  padding: 8px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  box-sizing: border-box;
}

.kb__head {
  text-align: center;
  margin-bottom: 4px;
}

.kb__label {
  font-size: 11px;
  font-weight: 700;
  color: #17141a;
}

.kb__weekday {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  margin-bottom: 4px;
}

.kb__weekday span {
  font-size: 9px;
  text-align: center;
  color: rgba(23, 20, 26, 0.72);
}

.kb__gridWrap {
  position: relative;
}

.kb__grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-auto-rows: 21px;
  position: relative;
  z-index: 1;
}

.kb__cell {
  display: grid;
  place-items: center;
  border: none;
  background: transparent;
  font-size: 11px;
  color: #17141a;
  border-radius: 4px;
  cursor: pointer;
}

.kb__cell:focus {
  outline: none;
}

.kb__cell--out {
  visibility: hidden;
}

.kb__ring {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  border: 2px solid #0a4fe8;
  border-radius: 4px;
  box-sizing: border-box;
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
  pointer-events: none;
}

@media (max-width: 340px) {
  .kb {
    max-width: 180px;
  }
  .kb__grid {
    grid-auto-rows: 17px;
  }
  .kb__cell {
    font-size: 10px;
  }
  .kb__weekday span {
    font-size: 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .kb__ring {
    transition: none;
  }
}