.form-group label { font-weight: bold; }
 textarea#playlist-input { font-family: monospace; }
 #preview-container { margin-top: 30px; min-height: 320px; }
 .audio-player { border-radius: 5px; padding: 15px; color: #fff; position: relative; user-select: none; }
 .audio-player .playlist { overflow-y: auto; border-radius: 4px; padding: 5px; margin-bottom: 5px; }
 .audio-player .playlist-item { padding: 5px 10px; cursor: pointer; border-radius: 3px; }
 .audio-player .playlist-item.active { font-weight: bold; background-color: rgba(255,255,255,0.3); }
 .audio-player .time { font-size: 12px; }
 .audio-player input[type=range] { vertical-align: middle; cursor: pointer; }
 .audio-player .btn-toolbar { margin-bottom: 5px; }
 .audio-player .progress { margin-top: 5px; }
 .btn-custom { background-color: var(--btn-bg-color, transparent); color: var(--btn-text-color, #fff); border: none; cursor: pointer; transition: filter 0.3s ease; font-size: inherit; padding: 6px 12px; }
 .btn-custom:hover, .btn-custom:focus { filter: brightness(1.3); outline: none; }
 .btn-shape-square { border-radius: 0 !important; }
 .btn-shape-rounded { border-radius: 8px !important; }
 .btn-shape-circle { border-radius: 50% !important; width: 36px; height: 36px; padding: 0 !important; text-align: center; line-height: 36px; }
 .btn-shadow { box-shadow: 0 2px 5px rgba(0,0,0,0.3); }
 .progress-linear { height: 10px; cursor: pointer; background-color: rgba(255,255,255,0.3); border-radius: 5px; }
 .progress-linear .progress-bar { background-color: #fff; transition: width 0.3s ease; }
 .progress-gradient .progress-bar { background: linear-gradient(90deg, #ff7e5f, #feb47b); }
 .layout-buttons-top-playlist-bottom .btn-toolbar { margin-bottom: 5px; }
 .layout-buttons-top-playlist-bottom .progress { margin-top: 5px; }
 .layout-buttons-top-playlist-bottom .playlist { margin-bottom: 5px; }
 .layout-buttons-bottom-playlist-top .playlist { margin-bottom: 5px; }
 .layout-buttons-bottom-playlist-top .btn-toolbar { margin-top: 5px; }
 .layout-buttons-bottom-playlist-top .progress { margin-top: 5px; }
 @media (max-width: 768px) { .hide-mobile { display: none !important; } }
 @media (max-width: 992px) { .hide-tablet { display: none !important; } }
 #notification { position: fixed; top: 20px; right: 20px; min-width: 200px; z-index: 1050; display: none; padding: 10px 15px; border-radius: 4px; color: #fff; font-weight: 600; box-shadow: 0 2px 6px rgba(0,0,0,0.3); }
 #notification.success { background-color: #5cb85c; }
 #notification.error { background-color: #d9534f; }