body {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), 
                url('../img/fondo-ecosocialismo.jpg') no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    padding: 40px;
    max-width: 450px;
    width: 100%;
    border: 3px solid #27ae60;
}

.header-logo {
    text-align: center;
    margin-bottom: 20px;
}

.header-logo img {
    height: 80px;
}

.login-title {
    text-align: center;
    color: #2c3e50;
    font-weight: 700;
    margin-bottom: 30px;
    border-bottom: 3px solid #e74c3c;
    padding-bottom: 15px;
}

.form-label {
    font-weight: 600;
    color: #2c3e50;
    font-size: 0.9rem;
}

.input-group-text {
    background: #f8f9fa;
    border-right: none;
    border-color: #dee2e6;
}

.form-control {
    border-left: none;
    border-color: #dee2e6;
}

.form-control:focus {
    border-color: #27ae60;
    box-shadow: 0 0 0 0.2rem rgba(39, 174, 96, 0.25);
    background-color: #f0fff4;
}

.input-group:focus-within .input-group-text {
    background-color: #f0fff4;
}

.btn-login {
    background: linear-gradient(135deg, #27ae60, #2ecc71);
    border: none;
    color: white;
    padding: 12px 30px;
    font-weight: 600;
    width: 100%;
}

.btn-login:hover {
    background: linear-gradient(135deg, #229954, #27ae60);
    color: white;
}

.error {
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 5px;
}

.is-invalid {
    border-color: #e74c3c !important;
}