body {
    font-family: 'Segoe UI', Arial, sans-serif;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f8f9fa;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    color: #2c3e50;
}

.main-title {
    font-size: 2.5em;
    margin-bottom: 10px;
    color: #1a237e;
}

.sub-title {
    font-size: 1.5em;
    color: #3949ab;
    font-weight: normal;
}

.file-list {
    list-style: none;
    padding: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.file-item {
    padding: 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-item:hover {
    background: #f5f5f5;
}

.video-controls {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 8px 16px;
    background: #3949ab;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.btn:hover {
    background: #1a237e;
}

#videoPlayer {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: black;
    padding: 20px;
    border-radius: 8px;
    z-index: 1000;
}

.close-btn {
    position: absolute;
    right: 10px;
    top: 10px;
    color: white;
    cursor: pointer;
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 999;
}