/* Fond dégradé bleu */
body {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%) !important;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    padding: 40px 20px;
}

/* Masquer le fond spatial par défaut */
#background_url {
    display: none !important;
}

/* Container principal */
.container {
    max-width: 650px !important;
}

/* Carte principale */
.card {
    border-radius: 16px !important;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3) !important;
    border: none !important;
}

.card-body {
    padding: 50px 40px !important;
}

/* MASQUER LES LOGOS */
.navbar-brand img.menu-logo,
img.logo,
img[src*="ltb-logo"] {
    display: none !important;
}

/* Ajuster le titre sans logo */
.navbar-brand {
    font-size: 20px;
    font-weight: 600;
    color: #1e3c72 !important;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Menu navbar - style moderne */
.navbar {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%) !important;
    border-radius: 12px !important;
    margin-bottom: 30px !important;
    padding: 15px 20px !important;
}

/* Items du menu */
.nav-item .nav-link {
    padding: 12px 24px !important;
    margin: 0 8px !important;
    border-radius: 10px !important;
    color: #1565c0 !important;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.3s ease;
    background: transparent !important;
}

.nav-item .nav-link:hover {
    background: linear-gradient(135deg, #bbdefb 0%, #90caf9 100%) !important;
    color: #0d47a1 !important;
    transform: translateY(-2px);
}

.nav-item .nav-link.active {
    background: linear-gradient(135deg, #1e88e5 0%, #1565c0 100%) !important;
    color: white !important;
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.4);
}

.nav-item .nav-link i {
    font-size: 16px;
    margin-right: 6px;
}

/* Alertes avec dégradés */
.alert {
    border-radius: 12px !important;
    padding: 18px 24px !important;
    margin-bottom: 25px !important;
    border: none !important;
    font-size: 15px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1) !important;
}

.alert-success {
    background: linear-gradient(135deg, #c8e6c9 0%, #a5d6a7 100%) !important;
    color: #2e7d32 !important;
}

.alert-warning {
    background: linear-gradient(135deg, #fff9c4 0%, #fff59d 100%) !important;
    color: #f57f17 !important;
}

.alert-info {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%) !important;
    color: #0d47a1 !important;
}

.alert-danger {
    background: linear-gradient(135deg, #ffcdd2 0%, #ef9a9a 100%) !important;
    color: #c62828 !important;
}

/* Labels de formulaire */
.col-form-label {
    color: #1565c0 !important;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* Groupes de champs */
.input-group {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border-radius: 10px !important;
    overflow: hidden;
}

.input-group-text {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%) !important;
    border: 2px solid #90caf9 !important;
    border-right: none !important;
    color: #1565c0 !important;
    font-size: 16px;
}

/* Champs de saisie */
.form-control {
    padding: 14px 18px !important;
    border: 2px solid #90caf9 !important;
    border-left: none !important;
    font-size: 15px !important;
    background: #f8fbff !important;
    transition: all 0.3s ease;
}

.form-control:focus {
    background: #ffffff !important;
    border-color: #1e88e5 !important;
    box-shadow: 0 0 0 4px rgba(30, 136, 229, 0.15) !important;
    outline: none;
}

.form-control:focus + .input-group-text {
    border-color: #1e88e5 !important;
}

/* Espacement des lignes de formulaire */
.row.mb-3 {
    margin-bottom: 25px !important;
}

/* Bouton principal */
.btn-success {
    padding: 14px 32px !important;
    background: linear-gradient(135deg, #1e88e5 0%, #1565c0 100%) !important;
    border: none !important;
    border-radius: 25px !important;
    color: white !important;
    font-weight: 700;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.3) !important;
}

.btn-success:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(30, 136, 229, 0.5) !important;
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%) !important;
}

.btn-success i {
    margin-right: 8px;
}

/* Footer */
#footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .card-body {
        padding: 30px 20px !important;
    }
    
    .navbar {
        padding: 10px !important;
    }
    
    .nav-item .nav-link {
        margin: 5px 0 !important;
        width: 100%;
    }
    
    .col-form-label {
        text-align: left !important;
        margin-bottom: 8px;
    }
}

/* Navbar toggler pour mobile */
.navbar-toggler {
    border-color: #1565c0 !important;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%231565c0' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}