/* --- Import des polices Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Lato:wght@400;700&family=Poppins:wght@500;700;800&display=swap');

/* --- Variables de Design --- */
:root {
    --primary-color: #3A86FF;
    --primary-dark-color: #0d61d1;
    --secondary-color: #6c757d;
    --secondary-dark-color: #565e64;
    --success-color: #198754;
    --success-dark-color: #13653f;
    --danger-color: #dc3545;
    --danger-dark-color: #b02a37;
    --warning-color: #FFBE0B;
    --warning-dark-color: #D4A10A;
    
    --text-color: #212529;
    --text-on-primary: #ffffff;
    --text-on-accent: #212529;

    --background-gradient: linear-gradient(170deg, #f4f7f9 0%, #e9f0f6 100%);
    --card-background: #FFFFFF;
    
    --blur-background: rgba(255, 255, 255, 0.80);
    --blur-effect: saturate(180%) blur(15px);

    --border-radius: 0.8rem;
    --box-shadow: 0 4px 10px rgba(0,0,0,0.05), 0 1px 3px rgba(0,0,0,0.04);
    --box-shadow-hover: 0 12px 20px rgba(0,0,0,0.06), 0 5px 8px rgba(0,0,0,0.05);
}

/* --- Barre de Défilement --- */
::-webkit-scrollbar { width: 12px; }
::-webkit-scrollbar-track { background: #eef1f4; }
::-webkit-scrollbar-thumb { background: #bdc9d7; border-radius: 10px; border: 3px solid #eef1f4; }
::-webkit-scrollbar-thumb:hover { background: #aab8c9; }

/* --- Styles Globaux --- */
body {
    font-family: 'Lato', sans-serif;
    background-image: var(--background-gradient);
    color: var(--text-color);
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6, .navbar-brand { font-family: 'Poppins', sans-serif; font-weight: 700; }

.card {
    background-color: var(--card-background);
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
}

/* --- Barre de Navigation --- */
.navbar-blur {
    position: sticky;
    z-index: 1071;
    top: 0;
    background-color: var(--blur-background);
    -webkit-backdrop-filter: var(--blur-effect);
    backdrop-filter: var(--blur-effect);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding: 0.75rem 0;
    transition: all 0.3s ease;
}

.nav-link {
    font-family: 'Poppins', sans-serif; font-weight: 500;
    color: #495057; padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius);
    transition: color 0.2s ease-in-out, background-color 0.2s ease-in-out;
}
.nav-link:hover { color: var(--primary-color); background-color: rgba(0,0,0,0.05); }
.nav-link.active { color: var(--primary-color); font-weight: 700; }
.nav-link i { margin-right: 8px; font-size: 1.1em; vertical-align: middle; }

/* --- Menus Déroulants --- */
.dropdown-menu {
    border-radius: var(--border-radius); border: none;
    box-shadow: 0 0.5rem 1.5rem rgba(0,0,0,0.15); padding: 0.5rem;
    background-color: var(--blur-background);
    -webkit-backdrop-filter: var(--blur-effect);
    backdrop-filter: var(--blur-effect);
}

.dropdown-item {
    font-family: 'Poppins', sans-serif; font-weight: 500;
    padding: 0.6rem 1rem; border-radius: 0.5rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}
.dropdown-item i { margin-right: 10px; width: 20px; opacity: 0.7; }
.dropdown-item:active { background-color: var(--primary-color); color: white; }

/* --- ======================================================= --- */
/* ---        STYLE DE BOUTON DUOLINGO UNIFIÉ (VOTRE STYLE)      --- */
/* --- ======================================================= --- */
.btn {
    font-family: 'Poppins', sans-serif !important;
    font-weight: 700 !important;
    text-transform: uppercase !important;
    border-radius: var(--border-radius) !important;
    border-style: solid !important;
    border-width: 2px !important;
    border-bottom-width: 5px !important;
    padding: 0.75rem 1.5rem !important;
    transition: transform 0.1s ease-in-out, border-bottom-width 0.1s ease-in-out, filter 0.2s ease !important;
}

.btn:hover {
    filter: brightness(1.05); /* Effet universel qui fonctionne pour toutes les couleurs */
}

.btn:active {
    transform: translateY(3px) !important;
    border-bottom-width: 2px !important;
}

.btn:disabled, .btn.disabled {
    transform: translateY(3px) !important;
    border-bottom-width: 2px !important;
    background-color: var(--secondary-color) !important;
    border-color: var(--secondary-dark-color) !important;
    filter: grayscale(50%);
    opacity: 0.65;
}

/* Couleurs des boutons Bootstrap */
.btn-primary { background-color: var(--primary-color) !important; border-color: var(--primary-dark-color) !important; color: var(--text-on-primary) !important; }
.btn-secondary { background-color: var(--secondary-color) !important; border-color: var(--secondary-dark-color) !important; color: var(--text-on-primary) !important; }
.btn-success { background-color: var(--success-color) !important; border-color: var(--success-dark-color) !important; color: var(--text-on-primary) !important; }
.btn-danger { background-color: var(--danger-color) !important; border-color: var(--danger-dark-color) !important; color: var(--text-on-primary) !important; }
.btn-warning { background-color: var(--warning-color) !important; border-color: var(--warning-dark-color) !important; color: var(--text-on-accent) !important; }

/* Alias pour la cohérence */
.btn-duolingo {
    background-color: var(--warning-color) !important;
    border-color: var(--warning-dark-color) !important;
    color: var(--text-on-accent) !important;
}
.py-5 {
    padding-top: 1rem !important;
}