:root{--color-primary: #1a5276;--color-primary-dark: #154360;--color-primary-light: #2980b9;--color-secondary: #2c3e50;--color-accent: #27ae60;--color-background: #f5f5f5;--color-surface: #ffffff;--color-text: #333333;--color-text-muted: #666666;--color-border: #dddddd;--color-error: #e74c3c;--color-warning: #f39c12;--color-success: #27ae60;--font-family: Arial, sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);font-size:11pt;line-height:1.4;background-color:var(--color-background);color:var(--color-text)}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:5px;font-weight:700;font-size:11pt;color:var(--color-text)}input[type=text],input[type=number],input[type=email],input[type=password],select,textarea{font-family:var(--font-family);font-size:11pt;padding:10px 12px;border:1px solid var(--color-border);border-radius:4px;width:100%;color:var(--color-text);background:var(--color-surface)}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 2px #1a52761a}input:disabled{background:var(--color-background);cursor:not-allowed}.btn{font-family:var(--font-family);font-size:11pt;padding:10px 20px;border:none;border-radius:4px;cursor:pointer;transition:background .2s,opacity .2s;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-primary-dark)}.btn-secondary{background:var(--color-text-muted);color:#fff}.btn-secondary:hover:not(:disabled){background:var(--color-secondary)}.btn-success{background:var(--color-success);color:#fff}.btn-danger{background:var(--color-error);color:#fff}.btn-sm{padding:6px 12px;font-size:10pt}.card{background:var(--color-surface);border-radius:6px;box-shadow:0 1px 3px #0000001a;padding:20px;margin-bottom:20px}.card h2{font-size:14pt;color:var(--color-text);margin-bottom:15px}.app-layout{min-height:100vh;display:flex;flex-direction:column}.main-header{background:var(--color-surface);padding:12px 20px;display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid var(--color-primary);flex-shrink:0}.header-left{display:flex;align-items:center;gap:12px}.header-logo{height:50px;width:auto;cursor:pointer}.header-brand{cursor:pointer}.header-brand-name{font-size:14pt;font-weight:700;color:var(--color-primary)}.header-divider{color:var(--color-border);font-size:18pt;font-weight:200}.header-app-name{font-size:12pt;color:var(--color-text-muted)}.header-right{display:flex;align-items:center;gap:15px}.user-info{color:var(--color-text);font-size:11pt}.desktop-nav{display:flex;gap:25px;align-items:center}.desktop-nav a{color:var(--color-primary);text-decoration:none;font-size:11pt;font-weight:400;padding:6px 0;transition:opacity .2s}.desktop-nav a.nav-bold{font-weight:700}.desktop-nav a:hover{opacity:.8}.desktop-nav a.active{text-decoration:underline;text-underline-offset:4px}.main-content{flex:1;padding:20px;background:var(--color-background)}@media (max-width: 768px){.main-header{padding:10px 15px;flex-wrap:wrap;gap:10px}.header-logo{height:40px}.desktop-nav{display:none}.main-content{padding:15px}}.loading-screen{display:flex;justify-content:center;align-items:center;min-height:100vh;background:var(--color-background)}.loading-content{text-align:center;color:var(--color-text-muted)}.loading-spinner{width:40px;height:40px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 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140px);overflow-y:auto}.folder-tree-header{display:flex;justify-content:space-between;align-items:center;font-size:12pt;font-weight:700;color:var(--color-text);margin-bottom:15px;padding-bottom:10px;border-bottom:1px solid var(--color-border)}.folder-tree-controls{display:flex;gap:6px;align-items:center}.btn-mini{font-family:var(--font-family);font-size:9pt;padding:5px 12px;border:1px solid var(--color-border);border-radius:4px;background:var(--color-surface);color:var(--color-text);cursor:pointer;transition:background .15s;min-width:60px;height:28px}.btn-mini:hover{background:var(--color-background)}.btn-mini.btn-new{background:var(--color-primary);color:#fff;border-color:var(--color-primary);font-weight:500}.btn-mini.btn-new:hover{background:var(--color-primary-dark);border-color:var(--color-primary-dark)}.btn-back{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;padding:0;margin-right:8px;border:1px solid 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th.sortable-header:hover{color:var(--color-primary)}.sort-indicator{font-size:.7em;margin-left:4px;opacity:.7}.file-table tr:hover{background:var(--color-background)}.file-table tr[draggable]{cursor:grab}.file-table .file-name{display:flex;align-items:center;gap:10px}.file-table .file-icon{font-size:18pt;display:inline-flex;align-items:center;vertical-align:middle}.file-table .file-icon svg{width:34px;height:34px}.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:15px}.file-item{display:flex;flex-direction:column;align-items:center;padding:15px 10px;border-radius:6px;cursor:pointer;transition:background .15s;text-align:center}.file-item:hover{background:var(--color-background)}.file-item[draggable]{cursor:grab}.file-item.drop-target,.file-table tr.drop-target{outline:2px solid var(--color-primary);outline-offset:-2px;background:#1a527614}.file-item-icon{font-size:40px;margin-bottom:8px}.file-item-icon 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var(--color-border)}.upload-progress-text{font-size:10pt;color:var(--color-text);margin-bottom:8px}.upload-progress-bar{height:4px;background:var(--color-border);border-radius:2px;overflow:hidden}.upload-progress-fill{height:100%;background:var(--color-primary);transition:width .3s}.context-menu{position:fixed;background:var(--color-surface);border:1px solid var(--color-border);border-radius:6px;box-shadow:0 4px 12px #00000026;min-width:150px;z-index:1000;overflow:hidden}.context-menu button{display:block;width:100%;padding:10px 15px;border:none;background:none;text-align:left;font-size:11pt;cursor:pointer;transition:background .15s;color:var(--color-text)}.context-menu button:hover{background:var(--color-background)}.context-menu button.danger{color:var(--color-error)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:var(--color-surface);padding:25px;border-radius:8px;min-width:300px;max-width:90%;box-shadow:0 10px 40px #0003}.modal-content h3{margin-bottom:15px;font-size:13pt}.modal-input{width:100%;margin-bottom:15px}.modal-actions{display:flex;gap:10px;justify-content:flex-end}.modal-folder-picker{min-width:400px;max-width:500px}.folder-picker-container{max-height:350px;overflow-y:auto;border:1px solid var(--color-border);border-radius:4px;margin-bottom:15px;background:var(--color-background)}.folder-picker-loading{text-align:center;padding:30px;color:var(--color-text-muted)}.folder-picker-loading .loading-spinner{width:30px;height:30px}.folder-picker-tree{padding:8px 0}.folder-picker-item{display:flex;align-items:center;padding:6px 8px;cursor:pointer;transition:background 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8px 32px #0006}.file-viewer-header{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;background-color:var(--color-secondary);color:#fff;flex-shrink:0}.file-viewer-title{display:flex;align-items:center;gap:10px;min-width:0}.file-viewer-title h3{margin:0;font-size:13pt;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-viewer-icon{font-size:20px;flex-shrink:0}.file-viewer-actions{display:flex;gap:8px;flex-shrink:0}.file-viewer-close{font-size:16px;line-height:1;padding:6px 10px!important;min-width:0}.file-viewer-body{flex:1;overflow:hidden;position:relative;background:#f0f0f0}.viewer-iframe{width:100%;height:100%;border:none;background:#fff}.viewer-image-container{display:flex;flex-direction:column;height:100%}.viewer-image-controls{display:flex;align-items:center;gap:8px;padding:8px 16px;background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-shrink:0}.viewer-zoom-label{font-size:10pt;color:var(--color-text-muted);min-width:45px;text-align:center}.viewer-image-scroll{flex:1;overflow:auto;display:flex;align-items:center;justify-content:center;padding:20px}.viewer-image-scroll img{max-width:100%;max-height:100%;object-fit:contain;transition:transform .15s ease}.viewer-docx-container{height:100%;overflow:auto;background:#e8e8e8;padding:20px}.viewer-docx-container .docx-wrapper{background:#fff;padding:40px;margin:0 auto;max-width:900px;box-shadow:0 2px 8px #0000001f;border-radius:2px}.viewer-xlsx-container{display:flex;flex-direction:column;height:100%}.viewer-xlsx-tabs{display:flex;gap:0;background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:0 12px;flex-shrink:0;overflow-x:auto}.viewer-xlsx-tab{padding:8px 16px;border:none;background:none;font-size:10pt;cursor:pointer;color:var(--color-text-muted);border-bottom:2px solid 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svg{width:80px;height:80px}.viewer-info-name{margin:0 0 12px;font-size:16pt;font-weight:600;word-break:break-word}.viewer-info-meta{display:flex;gap:16px;color:var(--color-text-muted);font-size:10pt;margin-bottom:16px}.viewer-info-message{color:var(--color-text-muted);font-size:11pt;margin-bottom:24px;max-width:400px}.viewer-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:12px;color:var(--color-text-muted)}.viewer-error{display:flex;align-items:center;justify-content:center;height:100%;padding:40px;color:var(--color-error);font-size:12pt;text-align:center}.btn-icon{background:none;border:none;padding:5px 10px;cursor:pointer;font-size:16px;color:var(--color-text-muted);border-radius:4px;transition:background 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