body {
    background: radial-gradient(circle, #1a2a6c, #b21f1f, #fdbb2d);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.button-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2em;
    max-width: 30em;
}

.btn {
    position: relative;
    width: 7em;
    height: 7em;
    border-radius: 50%;
    outline: none;
    border: none;
    background: linear-gradient(145deg, #434343, #000000);
    box-shadow: 8px 8px 15px rgba(0, 0, 0, 0.6), -8px -8px 15px rgba(255, 255, 255, 0.1);
    color: #ffffff;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.btn:hover {
    transform: translateY(-10px) scale(1.1);
    box-shadow: 12px 12px 20px rgba(0, 0, 0, 0.7), -12px -12px 20px rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, #ff7e5f, #feb47b);
}

.btn span {
    font-size: 2.5em;
    transition: color 0.3s ease;
}

.btn.button-clicked {
    background: linear-gradient(145deg, #ff7e5f, #feb47b);
    box-shadow: inset 8px 8px 15px rgba(0, 0, 0, 0.6), inset -8px -8px 15px rgba(255, 255, 255, 0.1);
}

.btn.button-clicked span {
    color: #ffecd2;
}

.btn:active {
    transform: scale(0.95);
}
