body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f4f4f4;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.main-container {
    width: 100%;
    max-width: 600px;
}

h1 {
    text-align: center;
}

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

li {
    background-color: #fff;
    margin: 10px 0;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    cursor: pointer;
    border: none;
    transition: border 0.2s ease;
}

li:hover {
    background-color: #e0e0e0;
}

#videoView {
    text-align: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, #333333, #222222); /* Subtiler Gradient für Tiefe */
    color: white; /* Weiße Schrift für Lesbarkeit */
    z-index: 1000;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#videoPlayer {
    max-width: 90%;
    max-height: 70vh;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5); /* Schatten für Hervorhebung */
    border-radius: 8px; /* Abgerundete Ecken */
}

button {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #666666; /* Dunklerer Hintergrund für dunkles Theme */
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #444444; /* Noch dunkler beim Hover */
}

#filterButton {
    margin-bottom: 10px;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-top: 5px;
}

#filterOptions input[type="radio"] {
    display: none;
}

.filter-button {
    padding: 6px 8px;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 5px;
    display: inline-block;
    white-space: nowrap;
}

#filterOptions input[type="radio"]:checked + .filter-button {
    background-color: #007bff;
    color: white;
    border-color: #007bff;
}

.filter-button:hover {
    background-color: #e0e0e0;
}

#newMarks {
    display: none;
}