.upgrade-container {
    display: none;
}

.upgrade-container.show {
    display: block;
    margin: 2rem auto;
    max-width: 800px;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.upgrade-content {
    text-align: left;
}

.upgrade-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.upgrade-star {
    font-size: 1.4rem;
}

.upgrade-description {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

.upgrade-features {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
}

.upgrade-features li {
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.upgrade-cta {
    text-align: center;
}

/* Animation du bouton d'achat */
@keyframes pulse-glow {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(59, 62, 255, 0.4);
    }
    70% {
        transform: scale(1.02);
        box-shadow: 0 0 20px 10px rgba(59, 62, 255, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(59, 62, 255, 0);
    }
}

.upgrade-button {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.8rem;
    transition: all 0.3s ease;
    animation: pulse-glow 2s infinite;
    position: relative;
    overflow: hidden;
}

.upgrade-button:before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transform: rotate(45deg);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% {
        left: -50%;
    }
    100% {
        left: 150%;
    }
}

.upgrade-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 20px rgba(59, 62, 255, 0.3);
}

.upgrade-note {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Responsive */
@media (max-width: 768px) {
    .upgrade-container {
        padding: 1.5rem;
        margin: 1rem;
    }

    .upgrade-title {
        font-size: 1.3rem;
    }

    .upgrade-description,
    .upgrade-features li {
        font-size: 1rem;
    }

    .upgrade-button {
        width: 100%;
        padding: 0.8rem 1.5rem;
    }
}