* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: linear-gradient(135deg, #000000 0%, #4751df 100%);
    color: #fff;
    font-family: 'Poppins', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    text-align: center;
}

h1 {
    margin-bottom: 40px;
    font-size: 2.5rem;
    color: #ffffff;
}

.drum-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    max-width: 800px;
    padding: 0 50px;
}

.key {
    width: 90px;
    height: 90px;
    border: 2px solid #fff;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    background: #1e1e1e;
    cursor: pointer;
    transition: all 0.1s ease;
    user-select: none;
}

.key .letter {
    font-size: 1.8rem;
}

.key .sound {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 4px;
}

.key:active,
.key.playing {
    transform: scale(1.1);
    background: #4751df;
    box-shadow: 0 0 15px #4751df;
    border-color: #4751df;
}

.key.playing .sound {
    opacity: 1;
    color: #fff;
    font-weight: 700;
}

@media (max-width: 600px) {
    .key {
        width: 70px;
        height: 70px;
    }

    .key .letter {
        font-size: 1.4rem;
    }

    .key .sound {
        font-size: 0.7rem;
    }

    h1 {
        font-size: 2rem;
    }
}