/* styles.css */
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #00a78e;
}

.container {
    text-align: center;
}

.calculator-name {
    font-size: 2em;
    color: #ffffff;
    background-color: #007d6a;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 10px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.calculator {
    width: 280px;
    background-color: #ffffff;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    padding: 10px;
}

.display {
    background-color: #444;
    padding: 20px;
    border-radius: 10px;
}

#display {
    width: 100%;
    border: none;
    background: none;
    color: #ffffff;
    font-size: 2em;
    text-align: right;
    outline: none;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.btn {
    padding: 20px;
    font-size: 1.5em;
    border: 1px solid #ddd;
    cursor: pointer;
    background-color: #f0f0f0;
    border-radius: 10px;
    transition: background-color 0.2s, transform 0.2s;
}

.btn:active {
    background-color: #ccc;
    transform: scale(0.95);
}

.operator {
    background-color: #ff9800;
    color: #ffffff;
}

.operator:active {
    background-color: #fb8c00;
}

.equal {
    grid-column: span 2;
    background-color: #4caf50;
    color: #ffffff;
}

.equal:active {
    background-color: #43a047;
}

.clear {
    background-color: #f44336;
    color: #ffffff;
}

.clear:active {
    background-color: #e53935;
}