* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f0f4f8;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
    text-align: center;
}

h1 {
    color: #2c3e50;
    margin-bottom: 25px;
    font-size: 24px;
}

label {
    display: block;
    text-align: left;
    margin-bottom: 8px;
    color: #555;
    font-weight: bold;
}

input[type="number"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    margin-bottom: 20px;
    transition: border-color 0.3s;
}

input[type="number"]:focus {
    outline: none;
    border-color: #3498db;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

/* zbroj.php stilovi */
.brojevi {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    text-align: left;
}

.brojevi p {
    color: #555;
    font-size: 16px;
    margin-bottom: 8px;
}

.brojevi span {
    font-weight: bold;
    color: #3498db;
}

.rezultat {
    background-color: #3498db;
    color: white;
    padding: 20px;
    border-radius: 8px;
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 25px;
}

.natrag {
    display: inline-block;
    padding: 12px 30px;
    background-color: #2ecc71;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 16px;
    transition: background-color 0.3s;
}

.natrag:hover {
    background-color: #27ae60;
}

.greska {
    color: #e74c3c;
    font-size: 18px;
    margin-bottom: 20px;
}