.duurzaamheid-container {
    width: 80%;
    margin: 0 auto;
    padding: 2rem;
    border-radius: 12px;
    font-family: 'Segoe UI', Arial, sans-serif;
    color: var(--gray);
    line-height: 1.6;
}

.duurzaamheid-container h1 {
    color: var(--dark);
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 2.5rem;
    font-family: var(--roboto-slab);
    font-weight: 700;
    position: relative;
    padding-bottom: 1rem;
}

.duurzaamheid-container h1:after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary);
    border-radius: 2px;
}

.content-box {
    padding: 2rem;
    border-radius: 8px;
}

.earth-icon {
    font-size: 3rem;
    text-align: center;
    margin: 1.5rem 0;
    animation: float 3s ease-in-out infinite;
}

.sustainability-list {
    list-style: none;
    padding: 0;
    margin-top: 1.5rem;
}

.sustainability-list li {
    padding: 0.8rem;
    margin-bottom: 0.8rem;
    background-color: var(--accent-light);
    border-radius: 6px;
    display: flex;
    align-items: center;
}

.sustainability-list li:hover {
    background-color: var(--accent-dark);
    transform: translateX(5px);
    transition: all 0.3s ease;
}

.icon {
    margin-right: 10px;
    font-size: 1.2rem;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@media (max-width: 600px) {
    .duurzaamheid-container {
        width: 95%;
        padding: 1rem;
        margin: 0 auto;
    }

    .duurzaamheid-container h1 {
        font-size: 1.8rem;
    }

    .content-box {
        padding: 1rem;
    }

    .sustainability-list li {
        padding: 0.6rem;
        font-size: 0.9rem;
    }
}