:root {
    --bg-gradient: linear-gradient(135deg, #0f0c1b, #201335, #0f0c1b);
    --card-bg: rgba(255, 255, 255, 0.05);
    --color-text: #ffffff;
    --color-accent: #8a2be2;      /* Violet de base */
    --color-cyan-neon: #00f2fe;   /* Cyan électrique pour le dégradé du titre */
    --color-sub: #b3b3b3;
}

body {
    margin: 0;
    padding: 40px 20px;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    text-align: center;
    margin-bottom: 50px;
}

/* Titre principal ultra-stylisé et animé */
.main-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-top: 15px;
    margin-bottom: 10px;
    
    /* Effet de texte en dégradé */
    background: linear-gradient(90deg, var(--color-cyan-neon), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    
    /* Effet de lueur néon en arrière-plan */
    filter: drop-shadow(0 0 15px rgba(0, 242, 254, 0.3)) 
            drop-shadow(0 0 30px rgba(138, 43, 226, 0.2));
            
    animation: pulseGlow 4s ease-in-out infinite alternate;
}

/* Animation de respiration pour la lueur du titre */
@keyframes pulseGlow {
    0% {
        filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.2)) drop-shadow(0 0 20px rgba(138, 43, 226, 0.1));
    }
    100% {
        filter: drop-shadow(0 0 20px rgba(0, 242, 254, 0.5)) drop-shadow(0 0 35px rgba(138, 43, 226, 0.3));
    }
}

.subtitle {
    color: var(--color-sub);
    font-size: 1.2rem;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1200px;
    width: 100%;
    margin-bottom: 50px;
}

.card {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card h2 {
    color: var(--color-text);
    margin-top: 0;
}

.card p {
    color: var(--color-sub);
    line-height: 1.6;
    margin-bottom: 25px;
}

.card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 18px 40px rgba(138, 43, 226, 0.3), 0 0 20px var(--color-accent);
    border-color: var(--color-accent);
}

.upcoming {
    opacity: 0.6;
    border-style: dashed;
}

a {
    text-decoration: none;
}

.button-cta {
    display: inline-block;
    padding: 12px 25px;
    background-color: var(--color-accent);
    color: #ffffff !important;
    border-radius: 30px;
    font-weight: bold;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(138, 43, 226, 0.4);
}

.button-cta:hover {
    background-color: #a046f5;
    box-shadow: 0 6px 20px rgba(138, 43, 226, 0.6);
}

footer {
    margin-top: auto;
    color: var(--color-sub);
    font-size: 0.9rem;
    text-align: center;
}