/* ===============================================
   ANIMATION DE CHARGEMENT FEI - PROPRE & CENTRÉE
   =============================================== */

:root {
    --loader-primary: #00f5ca;
    --loader-secondary: #9c5096;
    --loader-bg: rgba(3, 6, 21, 0.98);
}

/* Container principal du loader */
#loader,
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 30% 20%, rgba(0, 245, 202, 0.08), transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(156, 80, 150, 0.08), transparent 50%),
                linear-gradient(135deg, rgba(3, 6, 21, 0.96), rgba(5, 11, 32, 0.96));
    z-index: 9999;
    transition: opacity 400ms cubic-bezier(0.4, 0, 0.2, 1),
                visibility 400ms cubic-bezier(0.4, 0, 0.2, 1);
    visibility: visible;
    overflow: hidden;
}

/* État caché du loader */
#loader.loader-hidden,
.loader.loader-hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Container pour l'animation */
.loader-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 280px;
    height: 280px;
}

/* Cercle animé externe */
#loader::before,
.loader::before {
    content: '';
    position: absolute;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: var(--loader-primary);
    border-right-color: var(--loader-secondary);
    background: radial-gradient(circle at 50% 50%, rgba(0, 245, 202, 0.05), transparent 70%);
    box-shadow: 0 0 40px rgba(0, 245, 202, 0.2),
                inset 0 0 30px rgba(0, 245, 202, 0.1);
    animation: loaderSpin 1.6s linear infinite;
}

/* Texte FEI-AIX centré */
#loader::after,
.loader::after {
    content: 'FEI-AIX';
    position: absolute;
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    letter-spacing: 0.3rem;
    font-size: 2rem;
    color: #ffffff;
    text-shadow: 0 0 20px rgba(0, 245, 202, 0.5),
                 0 0 40px rgba(0, 245, 202, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    background: rgba(3, 7, 18, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 245, 202, 0.3),
                inset 0 0 10px rgba(0, 245, 202, 0.1);
    animation: loaderPulse 2s ease-in-out infinite;
    white-space: nowrap;
    z-index: 2;
}

/* Animation de rotation */
@keyframes loaderSpin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Animation de pulsation */
@keyframes loaderPulse {
    0%, 100% {
        opacity: 0.7;
        letter-spacing: 0.25rem;
        box-shadow: 0 0 15px rgba(0, 245, 202, 0.25),
                    inset 0 0 8px rgba(0, 245, 202, 0.1);
    }
    50% {
        opacity: 1;
        letter-spacing: 0.35rem;
        box-shadow: 0 0 30px rgba(0, 245, 202, 0.5),
                    inset 0 0 15px rgba(0, 245, 202, 0.2);
    }
}

/* Cercles décoratifs en arrière-plan */
.loader-bg-circle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.4;
    animation: floatCircle 8s ease-in-out infinite;
}

.loader-bg-circle:nth-child(1) {
    width: 400px;
    height: 400px;
    top: -10%;
    left: -10%;
    background: radial-gradient(circle, var(--loader-secondary) 0%, transparent 70%);
    filter: blur(80px);
    animation-delay: 0s;
}

.loader-bg-circle:nth-child(2) {
    width: 350px;
    height: 350px;
    bottom: -5%;
    right: -5%;
    background: radial-gradient(circle, var(--loader-primary) 0%, transparent 70%);
    filter: blur(70px);
    animation-delay: 2s;
}

@keyframes floatCircle {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.3;
    }
    50% {
        transform: translate(20px, -20px) scale(1.1);
        opacity: 0.5;
    }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    #loader::before,
    .loader::before {
        width: 200px;
        height: 200px;
        border-width: 2px;
    }
    
    #loader::after,
    .loader::after {
        font-size: 1.6rem;
        letter-spacing: 0.25rem;
        padding: 0.4rem 1.2rem;
    }
    
    .loader-wrapper {
        width: 220px;
        height: 220px;
    }
    
    @keyframes loaderPulse {
        0%, 100% {
            letter-spacing: 0.2rem;
        }
        50% {
            letter-spacing: 0.3rem;
        }
    }
}

@media (max-width: 480px) {
    #loader::before,
    .loader::before {
        width: 180px;
        height: 180px;
    }
    
    #loader::after,
    .loader::after {
        font-size: 1.4rem;
        letter-spacing: 0.2rem;
        padding: 0.35rem 1rem;
    }
    
    .loader-wrapper {
        width: 200px;
        height: 200px;
    }
    
    .loader-bg-circle {
        display: none; /* Masquer les cercles décoratifs sur petits écrans */
    }
}