body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
}

.calculator {
    border: 1px solid #ccc;
    padding: 20px;
    border-radius: 10px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 400px;
}

.tab {
    overflow: hidden;
    border: 1px solid #ccc;
    background-color: #f1f1f1;
}

.tab button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: background-color 0.3s;
}

.tab button:hover {
    background-color: #ddd;
}

.tab button.active {
    background-color: #ccc;
}

.tabcontent {
    display: none;
    padding: 6px 12px;
    border: 1px solid #ccc;
    border-top: none;
}

.matrix-input, .complex-input {
    margin-bottom: 10px;
}

.matrix-input textarea, .complex-input input {
    width: 100%;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    margin-right: 5px;
    padding: 10px;
    border: none;
    border-radius: 5px;
    background-color: #f0f0f0;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #e0e0e0;
}

.result {
    margin-top: 10px;
}

.result textarea, .result input {
    width: 100%;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
}