:root {
    --primary-color: #000a2e;
    --primary-dark: #357abd;
    --text-color: #2c3e50;
}

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

html, body {
    height: 100%;
    font-family: 'Arial', sans-serif;
    color: var(--text-color);
    background-color: #000a2e;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.imagen {
    width: 100%;
    height: auto;
    margin-bottom: 30px;
}

.login-form {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(74, 144, 226, 0.1);
    width: 100%;
    max-width: 400px;
}

.grupo {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 500;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-color);
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.1);
}

.form__submit {
    background: var(--primary-color);
    color: white;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s ease;
}

.form__submit:hover {
    background: var(--primary-dark);
}

.error-message {
    background-color: red;
    color: white;
    padding: 12px;
    margin-bottom: 20px;
    border-radius: 4px;
    text-align: center;
    font-size: 14px;
}

@media screen and (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    .imagen {
        width: 100%;
    }
    
    .login-form {
        padding: 20px;
    }
}