*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
    text-align: center;
}

body{
    height: 100vh;
    background: linear-gradient(135deg, #1f1c2c, #928dab);
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
}

.game-wrapper{
    background: rgba(255,255,255,0.1);
    padding: 30px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.container{
    display: grid;
    grid-template-columns: repeat(2,150px);
    gap: 20px;
    margin-top: 20px;
}

.btn{
    height: 150px;
    width: 150px;
    border-radius: 20px;
    cursor: pointer;
    transition: 0.2s;
}

.red{ background: #ff4d4d; }
.green{ background: #00cc99; }
.orange{ background: #ff9933; }
.purple{ background: #6666ff; }

.flash{
    transform: scale(1.1);
    opacity: 0.6;
    box-shadow: 0 0 30px white;
}

.userflash{
    transform: scale(0.95);
    box-shadow: 0 0 20px yellow;
}

#startBtn{
    margin-top: 15px;
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    background: white;
    color: black;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

#startBtn:hover{
    background: #ddd;
}