body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.calculadora-container {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    width: 300px;
}

h1 {
    color: #333;
    font-size: 24px;
    margin-bottom: 20px;
}

.input-group {
    margin-bottom: 15px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #666;
    font-weight: bold;
}

input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-sizing: border-box; /* Para que el padding no afecte el ancho total */
    font-size: 16px;
}

.botones-container {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.btn {
    width: 60px;
    height: 60px;
    font-size: 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    color: white;
    transition: transform 0.1s;
}

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

/* Colores para cada operación */
.btn-suma { background-color: #4CAF50; }
.btn-resta { background-color: #f44336; }
.btn-multi { background-color: #FF9800; }
.btn-div { background-color: #2196F3; }

.resultado-container {
    background-color: #e8f0fe;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 15px;
}

.resultado-container h2 {
    margin: 0;
    font-size: 16px;
    color: #555;
}

#resultado {
    margin: 10px 0 0 0;
    font-size: 32px;
    font-weight: bold;
    color: #333;
}

.btn-limpiar {
    background-color: #9e9e9e;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
}