/* General Reset and Styling */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #e0e5ec;
}

/* Calculator Container */
#calculetor {
    background: #212121;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    width: 320px;
}

/* Input Display Box */
#inputBox {
    width: 100%;
    height: 70px;
    background: #333333;
    color: #ffffff;
    font-size: 3rem;
    text-align: right;
    padding: 0 20px;
    border: none;
    border-radius: 8px;
    margin-bottom: 20px;
    outline: none;
}

/* Keys Grid Layout */
#keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

/* Calculator Buttons */
#keys button {
    background: #383838;
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: 600;
    height: 60px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease;
}

/* Button Hover & Active Effects */
#keys button:hover {
    background: #4a4a4a;
}

#keys button:active {
    transform: scale(0.95);
}

/* Special Styling for Operators/Actions (Optional Enhancement) */
#keys button:last-child {
    background: #ff9500;
    color: #ffffff;
}

#keys button:last-child:hover {
    background: #e00000;
}
.butcol{
  background-color: orange;
}