/* --- VARIABLES GLOBALES --- */
:root {
    --bg-dark: #0a0a0a;
    --text-light: #ffffff;
    --text-gray: #a0aec0;
    --neon-color: #8b5cf6; /* Couleur violet néon (modifiable) */
    --neon-hover: #7c3aed;
}

/* --- RESET DE BASE --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    scroll-behavior: smooth; /* Pour un défilement fluide */
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
}

/* --- BARRE DE NAVIGATION --- */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px); /* Fait un effet verre dépoli très moderne */
    z-index: 100;
    border-bottom: 1px solid #1f1f1f;
}

.logo img {
    height: 50px;
}

.nav-menu a {
    color: var(--text-gray);
    text-decoration: none;
    margin-left: 30px;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--text-light);
}

/* --- SECTION HERO (ACCUEIL) --- */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    /* Image d'arrière-plan avec de la foule/lumière (URL provisoire pour tester) */
    background-image: url('https://images.unsplash.com/photo-1566737236500-c8ac43014a67?q=80&w=2070');
    background-size: cover;
    background-position: center;
}

/* Filtre noir par-dessus l'image pour lire le texte */
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 5rem;
    font-weight: 900;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.hero-content h1 span {
    color: var(--neon-color);
    text-shadow: 0 0 15px var(--neon-color); /* L'effet de lumière qui brille */
}

.hero-content p {
    font-size: 1.5rem;
    color: var(--text-gray);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* --- BOUTONS --- */
.btn-neon {
    display: inline-block;
    background-color: var(--neon-color);
    color: #fff;
    text-decoration: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.6); /* L'ombre colorée */
    transition: all 0.3s ease;
}

.btn-neon:hover {
    background-color: var(--neon-hover);
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.9);
    transform: translateY(-3px); /* Le bouton se soulève un peu au survol */
}