body {
    font-family: Arial, sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f5f5f5;
}

header {
    width: 100%;
    background-color: #333;
    color: #fff;
    padding: 10px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

header .logo {
    font-size: 2em;
}

header h1 {
    margin: 0;
}

header nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 15px;
}

header nav ul li {
    display: inline;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
    transition: background-color 0.3s;
}

header nav ul li a:hover {
    background-color: #555;
}

main {
    flex-grow: 1;
    width: 100%;
}

.calculator-section, .about-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    background-color: #f9f9f9;
    width: 100%;
    box-sizing: border-box;
}

.calculator {
    width: 360px;
    border: 1px solid #ccc;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-color: #fff;
    margin-bottom: 20px;
}

.display {
    background-color: #fff;
    padding: 20px;
    border-bottom: 1px solid #ccc;
}

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

.buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1px;
}

.btn {
    padding: 20px;
    font-size: 1.2em;
    border: none;
    background-color: #f0f0f0;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn:active {
    background-color: #ccc;
}

#deg, #rad {
    background-color: #FFA500;
    color: white;
}

.ac {
    background-color: #FF6347;
    color: white;
}

.description {
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 10px;
    padding: 20px;
    width: 360px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: left;
    margin-top: 20px;
    color: #333;
    line-height: 1.5;
}

.description h2 {
    text-align: center;
    color: #333;
}

.about-section {
    text-align: center;
}

footer {
    width: 100%;
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
}

footer .container {
    padding: 0 20px;
}