* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Digital-7', 'Calculator', monospace;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #000000;
}

.calculator {
    background-color: #1a1a1a;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(255, 255, 255, 0.1);
    border: 2px solid #333;
    width: 320px;
}

.brand {
    color: rgba(255, 255, 255, 0.7);
    text-align: left;
    font-size: 0.8em;
    margin-bottom: 5px;
    letter-spacing: 2px;
}

.solar-panel {
    background: linear-gradient(90deg, #1a1a1a, #2c2c2c, #1a1a1a);
    height: 30px;
    margin-bottom: 10px;
    border-radius: 3px;
    position: relative;
    overflow: hidden;
}

.solar-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(90deg, 
        transparent, 
        transparent 10px, 
        rgba(255, 255, 255, 0.1) 10px, 
        rgba(255, 255, 255, 0.1) 20px
    );
}

.display {
    margin-bottom: 20px;
    background-color: #222;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #444;
}

#result {
    width: 100%;
    height: 60px;
    font-size: 2.5em;
    text-align: right;
    padding: 10px;
    background-color: #1c4a1c;
    color: #32ff3a;
    border: none;
    border-radius: 3px;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    font-family: 'Digital-7', 'Calculator', monospace;
    letter-spacing: 2px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

button {
    padding: 15px;
    font-size: 1.2em;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background: linear-gradient(145deg, #2e2e2e, #1a1a1a);
    color: #fff;
    transition: all 0.2s;
    box-shadow: 3px 3px 5px #0d0d0d,
                -3px -3px 5px #333333;
}

button:active {
    box-shadow: inset 2px 2px 5px #0d0d0d,
                inset -2px -2px 5px #333333;
    transform: scale(0.95);
}

.operator {
    background: linear-gradient(145deg, #363636, #222222);
    color: #ff9500;
}

.equals {
    background: linear-gradient(145deg, #006400, #004d00);
    grid-column: span 2;
    color: #fff;
}

.equals:active {
    background: linear-gradient(145deg, #004d00, #006400);
}

/* Add shine effect to buttons */
button::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        rgba(255, 255, 255, 0.1),
        transparent
    );
    pointer-events: none;
}

/* Responsive design */
@media (max-width: 360px) {
    .calculator {
        width: 95%;
        padding: 10px;
    }

    button {
        padding: 10px;
        font-size: 1em;
    }

    #result {
        font-size: 2em;
        height: 50px;
    }
}