/* Algemene opmaak */
body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: url('Achtergrond.jpeg') no-repeat center center fixed;
    background-size: cover;
    position: relative;
}

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5); /* Zwarte overlay */
    z-index: 0;
    pointer-events: none;
}

/* Zorg ervoor dat de inhoud boven de overlay wordt weergegeven */
header, main, .lesmateriaal-container {
    position: relative;
    z-index: 1;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: rgba(0, 128, 0, 0.8);
    color: white;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.header-button {
    padding: 10px 20px;
    background-color: rgba(0, 150, 0, 0.9);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.header-button:hover {
    background-color: rgba(0, 180, 0, 1);
}

header h1 {
    flex: 1;
    text-align: center;
}

/* Main sectie met flexbox */
main {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 20px;
    gap: 20px;
    box-sizing: border-box;
}

/* Videospeler */
.video-container {
    flex: 2;
}

video {
    width: 100%;
    border-radius: 10px;
}

/* Afspeellijst */
.playlist {
    flex: 1;
    background-color: rgba(0, 128, 0, 0.8);
    padding: 20px;
    border-radius: 10px;
    color: white;
}

.playlist ul {
    list-style-type: none;
    padding: 0;
}

.playlist li {
    padding: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.playlist li:hover {
    background-color: rgba(0, 150, 0, 0.9);
}

/* Lesmateriaal knop */
.lesmateriaal-container {
    text-align: center;
    padding: 20px;
}

.lesmateriaal-container button {
    padding: 15px 30px;
    font-size: 18px;
    background-color: rgba(0, 128, 0, 0.8);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.lesmateriaal-container button:hover {
    background-color: rgba(0, 150, 0, 0.9);
}

/* Media Query voor mobiele apparaten */
@media (max-width: 600px) {
    header {
        flex-direction: column;
        align-items: center;
    }

    .header-content {
        flex-direction: column;
        gap: 10px;
    }

    main {
        flex-direction: column;
        align-items: center;
    }

    .video-container,
    .playlist {
        width: 100%;
    }
}