/* --- Reset et Configuration de base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #12053B; /* Ton bleu foncé en fond principal */
    color: #ffffff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* --- Arrière-plan : Des bulles éclatantes et bien visibles --- */
.bulla-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: #12053B;
    pointer-events: none;
}

.bubble {
    position: absolute;
    border-radius: 50%;
    filter: blur(30px); /* Blur réduit pour garder la forme de bulle bien visible */
    opacity: 0.8;       /* Augmenté pour une forte visibilité */
    will-change: transform;
}

/* Bulle Bleue Éclatante (à droite) */
.bubble-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle at 40% 40%, #2563eb 0%, #12053B 80%);
    top: 10%;
    right: 10%;
    animation: float-blue 20s infinite ease-in-out;
}

/* Bulle Violette Éclatante (à gauche) */
.bubble-2 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle at 40% 40%, #7c3aed 0%, #33004F 80%);
    bottom: 15%;
    left: 15%;
    animation: float-purple 25s infinite ease-in-out;
}

/* Animations de flottaison douce */
@keyframes float-blue {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-40px, 30px) scale(1.05); }
}

@keyframes float-purple {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -40px) scale(1.08); }
}

/* --- Structure du Header --- */
.main-header {
    background-color: #12053B;
    width: 100%;
    padding: 15px 0;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column; /* Aligne le logo au-dessus du menu comme sur l'image */
    align-items: center;
    gap: 15px;
}

.logo-container {
    display: flex;
    justify-content: center;
}

.site-logo {
    height: 75px; /* Taille idéale pour la visibilité du logo manette/fusée */
    width: auto;
    display: block;
}

.nav-links {
    display: flex;
    gap: 25px;
}

.nav-links a {
    color: #ffffff;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    opacity: 0.85;
    transition: opacity 0.3s, color 0.3s;
}

.nav-links a:hover {
    opacity: 1;
    color: #a78bfa;
}

/* --- Zone Centrale avec effet Verre Givré (Glassmorphism) --- */
.content-area {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 20px;
}

.hero {
    max-width: 650px;
    width: 100%;
    background: rgba(255, 255, 255, 0.07); /* Fond blanc ultra-léger pour le reflet */
    backdrop-filter: blur(15px);          /* Effet flouté derrière le verre */
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.15); /* Bordure fine brillante */
    border-radius: 24px;                  /* Coins bien arrondis */
    padding: 50px 40px;
    text-align: center;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
}

.hero h1 {
    font-size: 2.4rem;
    margin-bottom: 20px;
    color: #ffffff;
    font-weight: bold;
}

.hero p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #e2e8f0;
    margin-bottom: 35px;
    opacity: 0.9;
}

/* Bouton YouTube rouge dégradé avec lueur */
.btn-youtube {
    display: inline-block;
    background: linear-gradient(135deg, #dc2626, #991b1b);
    color: #ffffff;
    padding: 14px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 8px 25px rgba(220, 38, 38, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-youtube:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(220, 38, 38, 0.6);
}

/* --- Pied de page (Footer) --- */
.main-footer {
    background-color: #33004F; /* Ton violet sombre */
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
    padding: 20px;
    font-size: 0.95rem;
    margin-top: auto;
}