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

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #1a3a7c 0%, #2d5aa8 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
}

.login-box {
    background: white;
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.login-logo {
    width: 100px;
    height: auto;
    margin-bottom: 1.5rem;
}

.login-box h1 {
    color: #1a3a7c;
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.login-box p {
    color: #666;
    margin-bottom: 2rem;
}

.login-form {
    text-align: left;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #2d5aa8;
}

.error-message {
    color: #d32f2f;
    background: #ffebee;
    padding: 0.75rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    display: none;
}

.error-message.show {
    display: block;
}

.btn-login {
    width: 100%;
    padding: 0.875rem;
    background: #2d5aa8;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s ease;
}

.btn-login:hover {
    background: #1a3a7c;
}

.volver-link {
    display: inline-block;
    margin-top: 1.5rem;
    color: #2d5aa8;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

.volver-link:hover {
    color: #1a3a7c;
}

@media (max-width: 480px) {
    .login-box {
        padding: 1.5rem;
    }
    
    .login-box h1 {
        font-size: 1.5rem;
    }
}