body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    font-family: Arial, sans-serif;
}

#bg-video {
    position: fixed;
    top: 0;
    left: 0;
    min-width: 100%;
    min-height: 100%;
    object-fit: cover;
    z-index: -1;
}

.center-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    gap: 40px;
}

.main-btn {
    padding: 25px 60px;
    font-size: 32px;
    border: 4px solid rgba(0, 0, 0, 0.9); /* Bordure noire épaisse */
    border-radius: 16px;
    cursor: pointer;

    background: rgba(255, 255, 255, 0.35); /* Opaque mais moderne */
    backdrop-filter: blur(12px);

    color: white;
    font-weight: bold;

    /* Contour noir autour du texte */
    text-shadow:
        -2px -2px 0 #000,
         2px -2px 0 #000,
        -2px  2px 0 #000,
         2px  2px 0 #000;

    transition: 0.25s ease;
}

.main-btn:hover {
    background: rgba(255, 255, 255, 0.55);
    transform: scale(1.10);

    /* Glow léger */
    box-shadow: 0 0 25px rgba(0, 0, 0, 0.8);
}