:root{--preview-primary:#193c76;--preview-secondary:#0077b6;--preview-success:#28a745;--preview-danger:#dc3545;--preview-warning:#ffc107;--preview-dark:#212529;--preview-light:#f8f9fa;--preview-border:#dee2e6;}  #materialPreviewModal .modal-dialog{max-width:90%;margin:1.75rem auto;} #materialPreviewModal .modal-content{border-radius:16px;border:none;box-shadow:0 10px 40px rgba(0, 0, 0, 0.2);} #materialPreviewModal .modal-header{background:linear-gradient(135deg, var(--preview-primary), var(--preview-secondary));color:white;border-radius:16px 16px 0 0;padding:20px 30px;border:none;} #materialPreviewModal .modal-header .btn-close{filter:brightness(0) invert(1);opacity:0.8;} #materialPreviewModal .modal-header .btn-close:hover{opacity:1;} .preview-header-info{display:flex;flex-direction:column;gap:8px;flex:1;} .preview-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255, 255, 255, 0.2);padding:4px 12px;border-radius:20px;font-size:12px;font-weight:600;width:fit-content;} .preview-badge i{font-size:14px;} #materialPreviewModal .modal-title{margin:0;font-size:20px;font-weight:700;} #materialPreviewModal .modal-body{padding:30px;min-height:400px;max-height:calc(100vh - 300px);overflow-y:auto;} #materialPreviewModal .modal-footer{padding:20px 30px;border-top:2px solid var(--preview-border);background:var(--preview-light);border-radius:0 0 16px 16px;}  .preview-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;gap:20px;} .preview-loading .spinner-border{width:3rem;height:3rem;} .preview-loading p{font-size:16px;color:#666;margin:0;}  .preview-error{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;gap:20px;text-align:center;} .preview-error i{font-size:64px;color:var(--preview-danger);} .preview-error h4{color:var(--preview-dark);font-weight:700;margin:0;} .preview-error p{color:#666;max-width:500px;margin:0;}  .preview-container{animation:fadeIn 0.3s ease-in;} @keyframes fadeIn{from{opacity:0;transform:translateY(10px);} to{opacity:1;transform:translateY(0);}}  .video-wrapper{position:relative;width:100%;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0, 0, 0, 0.1);background:#000;} .video-wrapper #videoPlayer{width:100%;height:auto;min-height:400px;}  .plyr{border-radius:12px;} .plyr--video{background:#000;} .plyr__control--overlaid{background:rgba(25, 60, 118, 0.9);} .plyr__control--overlaid:hover{background:var(--preview-primary);} .plyr--full-ui input[type=range]{color:var(--preview-primary);} .plyr__control.plyr__tab-focus, .plyr__control:hover, .plyr__control[aria-expanded=true]{background:var(--preview-primary);}  .text-content-wrapper{background:white;border-radius:12px;padding:30px;box-shadow:0 2px 8px rgba(0, 0, 0, 0.05);border:1px solid var(--preview-border);} .text-preview-content{font-size:16px;line-height:1.8;color:#333;max-height:500px;overflow-y:auto;} .text-preview-content h1, .text-preview-content h2, .text-preview-content h3, .text-preview-content h4, .text-preview-content h5, .text-preview-content h6{color:var(--preview-primary);font-weight:700;margin-top:24px;margin-bottom:12px;} .text-preview-content h1{font-size:28px;} .text-preview-content h2{font-size:24px;} .text-preview-content h3{font-size:20px;} .text-preview-content p{margin-bottom:16px;} .text-preview-content ul, .text-preview-content ol{margin-bottom:16px;padding-left:24px;} .text-preview-content li{margin-bottom:8px;} .text-preview-content strong{font-weight:600;color:var(--preview-dark);} .text-preview-content em{font-style:italic;} .text-preview-content code{background:var(--preview-light);padding:2px 6px;border-radius:4px;font-family:'Courier New', monospace;font-size:14px;color:var(--preview-danger);} .text-preview-content pre{background:var(--preview-dark);color:#fff;padding:16px;border-radius:8px;overflow-x:auto;margin-bottom:16px;} .text-preview-content blockquote{border-left:4px solid var(--preview-primary);padding-left:16px;margin:16px 0;font-style:italic;color:#666;}  .pdf-controls{display:flex;justify-content:space-between;align-items:center;padding:16px;background:var(--preview-light);border-radius:12px 12px 0 0;border:1px solid var(--preview-border);border-bottom:none;gap:16px;flex-wrap:wrap;} .pdf-nav-controls{display:flex;align-items:center;gap:12px;} .pdf-page-info{font-size:14px;font-weight:600;color:var(--preview-dark);padding:0 8px;} .pdf-zoom-controls{display:flex;align-items:center;gap:12px;} #pdfZoomLevel{font-size:14px;font-weight:600;color:var(--preview-dark);min-width:50px;text-align:center;} .pdf-viewer-wrapper{background:#525659;border:1px solid var(--preview-border);border-radius:0 0 12px 12px;padding:20px;display:flex;justify-content:center;align-items:flex-start;min-height:500px;max-height:600px;overflow:auto;} #pdfCanvas{max-width:100%;height:auto;box-shadow:0 4px 16px rgba(0, 0, 0, 0.3);background:white;}  .preview-note{display:flex;align-items:center;gap:12px;margin-top:20px;padding:16px 20px;background:linear-gradient(135deg, rgba(40, 167, 69, 0.1), rgba(32, 201, 151, 0.1));border:1px solid rgba(40, 167, 69, 0.3);border-radius:12px;} .preview-note i{font-size:20px;color:var(--preview-success);flex-shrink:0;} .preview-note span{font-size:14px;color:#333;font-weight:500;}  @media (max-width:991px){#materialPreviewModal .modal-dialog{max-width:95%;} #materialPreviewModal .modal-body{padding:20px;max-height:calc(100vh - 250px);} .text-content-wrapper{padding:20px;} .text-preview-content{font-size:15px;} .video-wrapper #videoPlayer{min-height:300px;}} @media (max-width:768px){#materialPreviewModal .modal-header{padding:16px 20px;} #materialPreviewModal .modal-title{font-size:18px;} #materialPreviewModal .modal-body{padding:16px;} #materialPreviewModal .modal-footer{padding:16px 20px;flex-direction:column;gap:10px;} #materialPreviewModal .modal-footer .btn{width:100%;} .pdf-controls{flex-direction:column;align-items:stretch;gap:12px;} .pdf-nav-controls{justify-content:space-between;} .pdf-zoom-controls{justify-content:center;} .preview-note{padding:12px 16px;} .preview-note span{font-size:13px;} .video-wrapper #videoPlayer{min-height:250px;}} @media (max-width:576px){#materialPreviewModal .modal-dialog{margin:0.5rem;max-width:calc(100% - 1rem);} .text-content-wrapper{padding:16px;} .text-preview-content{font-size:14px;} .pdf-page-info{font-size:13px;} .pdf-controls .btn{padding:6px 10px;font-size:13px;} .video-wrapper #videoPlayer{min-height:200px;}}  .text-preview-content::-webkit-scrollbar, .pdf-viewer-wrapper::-webkit-scrollbar, #materialPreviewModal .modal-body::-webkit-scrollbar{width:8px;} .text-preview-content::-webkit-scrollbar-track, .pdf-viewer-wrapper::-webkit-scrollbar-track, #materialPreviewModal .modal-body::-webkit-scrollbar-track{background:var(--preview-light);border-radius:4px;} .text-preview-content::-webkit-scrollbar-thumb, .pdf-viewer-wrapper::-webkit-scrollbar-thumb, #materialPreviewModal .modal-body::-webkit-scrollbar-thumb{background:#ccc;border-radius:4px;} .text-preview-content::-webkit-scrollbar-thumb:hover, .pdf-viewer-wrapper::-webkit-scrollbar-thumb:hover, #materialPreviewModal .modal-body::-webkit-scrollbar-thumb:hover{background:#999;}