:root {
    --primary-color: #004a99; 
    --secondary-color: #f4f4f9;
    --accent-color: #28a745;
    --error-color: #dc3545;
    --text-color: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

h2 { 
    color: var(--primary-color); 
    margin-bottom: 1.5rem; 
}

.btn-group { 
    display: flex; 
    flex-direction: column; 
    gap: 1rem; 
}

button {
    padding: 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

.btn-login {
    background-color: var(--primary-color);
    color: white;
}

.btn-login:hover { 
    background-color: #003366; 
}

#section-2fa {
    margin-top: 20px;
}

input {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border: 2px solid #ddd;
    border-radius: 8px;
}

input:focus {
    border-color: var(--primary-color);
}