body {
    background: url('src/images/CalcBg2.jpg') no-repeat center center;
    background-size: cover;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: rgba(245, 245, 245, 1);
}
#calculator {
    font-family: 'Poppins', sans-serif;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    max-width: 100%;
    width: 350px;
    padding: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

header {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: auto;
    gap: 10px;
}
header i {
    font-size: 24px;
    padding: auto;
}
header h1 {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    color: #5333dc;
    padding: auto;
}

#display {
    width: 90%;
    padding: 20px;
    font-size: 2.5rem;
    text-align: right;
    border: none;
    border-radius: 15px;
    background: rgba(0, 0, 0, 0.3);
    color: white;
    box-shadow: inset 0 -1px 5px rgba(0, 0, 0, 0.4);
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}
#keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    padding: 20px;
}
button {
    width: 100%;
    height: 70px;
    border-radius: 15px;
    border: none;
    background: linear-gradient(145deg, rgba(106, 17, 203, 1), rgba(37, 117, 252, 1));
    color: white;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}
button:hover {
    background: linear-gradient(145deg, rgba(142, 68, 173, 1), rgba(52, 152, 219, 1));
    transform: scale(1.05);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.4);
}
button:active {
    background: linear-gradient(145deg, rgba(155, 89, 182, 1), rgba(41, 128, 185, 1));
    transform: scale(1.02);
}
.operator-btn {
    background: linear-gradient(145deg, rgba(255, 152, 0, 1), rgba(255, 87, 34, 1));
}
.operator-btn:hover {
    background: linear-gradient(145deg, rgba(255, 167, 38, 1), rgba(255, 112, 67, 1));
}
.operator-btn:active {
    background: linear-gradient(145deg, rgba(255, 183, 77, 1), rgba(255, 138, 101, 1));
}
.ACoperator-btn {
    background: linear-gradient(145deg, rgba(231, 76, 60, 1), rgba(192, 57, 43, 1));
}
.ACoperator-btn:hover {
    background: linear-gradient(145deg, rgba(240, 96, 84, 1), rgba(211, 72, 54, 1));
}
.ACoperator-btn:active {
    background: linear-gradient(145deg, rgba(241, 122, 106, 1), rgba(217, 88, 70, 1));
}

#mute-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: none;
    backdrop-filter: blur(10px);
    border: none;
    cursor: pointer;
    color: #5333dc;
    font-size: 18px;
    width: 50px; 
    height: 50px; 
}
#mute-btn:hover {
    color: #e32d2d;
}
#mute-btn i {
    font-size: inherit;
}

@media (max-width: 500px) {
    #display {
        font-size: 2rem;
    }
    button {
        font-size: 1.5rem;
        height: 60px;
    }
}
@media (max-width: 320px) {
    #display {
        font-size: 1.8rem;
    }
    button {
        font-size: 1.6rem;
        height: 50px;
    }
}