.react-area {
    display: flex; align-items: center; justify-content: center; text-align: center;
    padding: 1rem; min-height: min(52vh, 380px); border-radius: 24px;
    font-family: var(--kf); font-weight: 700; font-size: clamp(1.4rem, 5vw, 2.2rem);
    color: #fff; cursor: pointer; user-select: none; margin-bottom: 1rem;
    transition: background .1s;
}
.react-idle { background: linear-gradient(160deg, #74c0fc, #1971c2); }
.react-wait { background: linear-gradient(160deg, #ff8787, #e03131); }
.react-go { background: linear-gradient(160deg, #8ce99a, #2f9e44); }
.react-result { background: linear-gradient(160deg, #ffd43b, #f59f00); color: #5b3d00; }