:root{--color-bg: #ffffff;--color-fg: #000000;--color-border: #e5e5e5;--color-hover: #f5f5f5;--color-accent: #333333;--color-error: #dc2626;--color-success: #16a34a;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--border-width: 1px;--border-radius: 4px;--transition: .2s ease;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;--text-xs: 12px;--text-sm: 14px;--text-base: 16px;--text-lg: 18px;--text-xl: 20px;--text-2xl: 24px;--text-3xl: 32px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:1.5;color:var(--color-fg);background-color:var(--color-bg);min-height:100vh}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;margin-bottom:var(--spacing-md)}h1{font-size:var(--text-3xl)}h2{font-size:var(--text-2xl)}h3{font-size:var(--text-xl)}h4{font-size:var(--text-lg)}p{margin-bottom:var(--spacing-md)}a{color:var(--color-fg);text-decoration:none;transition:opacity var(--transition)}a:hover{opacity:.7}ul,ol{list-style:none}img{max-width:100%;height:auto;display:block}button,input,textarea,select{font-family:inherit;font-size:inherit;line-height:inherit}button{cursor:pointer;border:none;background:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg)}.container-sm{max-width:600px}.container-fluid{width:100%;padding:0 var(--spacing-lg)}.flex{display:flex}.flex-col{flex-direction:column}.flex-wrap{flex-wrap:wrap}.items-center{align-items:center}.items-start{align-items:flex-start}.items-end{align-items:flex-end}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.justify-end{justify-content:flex-end}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.grid{display:grid}.grid-cols-2{grid-template-columns:repeat(2,1fr)}.grid-cols-3{grid-template-columns:repeat(3,1fr)}.grid-cols-4{grid-template-columns:repeat(4,1fr)}.mt-sm{margin-top:var(--spacing-sm)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}.mt-xl{margin-top:var(--spacing-xl)}.mb-sm{margin-bottom:var(--spacing-sm)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.mb-xl{margin-bottom:var(--spacing-xl)}.p-sm{padding:var(--spacing-sm)}.p-md{padding:var(--spacing-md)}.p-lg{padding:var(--spacing-lg)}.p-xl{padding:var(--spacing-xl)}@media(max-width:768px){.container{padding:0 var(--spacing-md)}.grid-cols-4,.grid-cols-3{grid-template-columns:repeat(2,1fr)}}@media(max-width:480px){.grid-cols-4,.grid-cols-3,.grid-cols-2{grid-template-columns:1fr}}.page{min-height:100vh;display:flex;flex-direction:column}.page-header{background:var(--color-fg);color:var(--color-bg);padding:var(--spacing-md) 0;border-bottom:var(--border-width) solid var(--color-border)}.page-content{flex:1;padding:var(--spacing-xl) 0}.auth-layout{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--color-bg);padding:var(--spacing-lg)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--spacing-sm) var(--spacing-lg);font-size:var(--text-base);font-weight:500;border:var(--border-width) solid var(--color-fg);border-radius:var(--border-radius);background:var(--color-bg);color:var(--color-fg);cursor:pointer;transition:all var(--transition);text-decoration:none;gap:var(--spacing-sm)}.btn:hover{background:var(--color-fg);color:var(--color-bg);opacity:1}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-fg);color:var(--color-bg)}.btn-primary:hover{background:var(--color-accent);border-color:var(--color-accent)}.btn-sm{padding:var(--spacing-xs) var(--spacing-md);font-size:var(--text-sm)}.btn-lg{padding:var(--spacing-md) var(--spacing-xl);font-size:var(--text-lg)}.btn-block{width:100%}.btn-danger{border-color:var(--color-error);color:var(--color-error)}.btn-danger:hover{background:var(--color-error);color:var(--color-bg)}.form-group{margin-bottom:var(--spacing-lg)}.form-label{display:block;margin-bottom:var(--spacing-sm);font-size:var(--text-sm);font-weight:500}.form-input,.form-textarea,.form-select{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:var(--text-base);border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);background:var(--color-bg);color:var(--color-fg);transition:border-color var(--transition)}.form-input:focus,.form-textarea:focus,.form-select:focus{outline:none;border-color:var(--color-fg)}.form-textarea{resize:vertical;min-height:100px}.form-error{color:var(--color-error);font-size:var(--text-sm);margin-top:var(--spacing-xs)}.form-checkbox{display:flex;align-items:center;gap:var(--spacing-sm)}.form-checkbox input[type=checkbox]{width:18px;height:18px;cursor:pointer}.card{background:var(--color-bg);border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);padding:var(--spacing-lg);transition:box-shadow var(--transition)}.card:hover{box-shadow:var(--shadow-md)}.card-header{margin-bottom:var(--spacing-md);padding-bottom:var(--spacing-md);border-bottom:var(--border-width) solid var(--color-border)}.card-title{font-size:var(--text-xl);font-weight:600;margin:0}.card-body{margin-bottom:var(--spacing-md)}.card-footer{margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:var(--border-width) solid var(--color-border)}.navbar{background:var(--color-fg);color:var(--color-bg);padding:var(--spacing-md) 0}.navbar-container{display:flex;align-items:center;justify-content:space-between}.navbar-brand{font-size:var(--text-xl);font-weight:600;color:var(--color-bg)}.navbar-nav{display:flex;gap:var(--spacing-lg);align-items:center}.navbar-link{color:var(--color-bg);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--border-radius);transition:background var(--transition)}.navbar-link:hover{background:#ffffff1a;opacity:1}.navbar-link.active{background:#fff3}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--spacing-lg)}.modal{background:var(--color-bg);border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);max-width:600px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg)}.modal-header{padding:var(--spacing-lg);border-bottom:var(--border-width) solid var(--color-border);display:flex;align-items:center;justify-content:space-between}.modal-title{font-size:var(--text-xl);font-weight:600;margin:0}.modal-close{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius);transition:background var(--transition)}.modal-close:hover{background:var(--color-hover)}.modal-body{padding:var(--spacing-lg)}.modal-footer{padding:var(--spacing-lg);border-top:var(--border-width) solid var(--color-border);display:flex;gap:var(--spacing-md);justify-content:flex-end}.upload-zone{border:2px dashed var(--color-border);border-radius:var(--border-radius);padding:var(--spacing-2xl);text-align:center;cursor:pointer;transition:all var(--transition);background:var(--color-bg)}.upload-zone:hover,.upload-zone.drag-over{border-color:var(--color-fg);background:var(--color-hover)}.upload-zone-icon{font-size:var(--text-3xl);margin-bottom:var(--spacing-md)}.upload-zone-text{font-size:var(--text-base);color:var(--color-accent)}.upload-zone-hint{font-size:var(--text-sm);color:var(--color-accent);opacity:.7;margin-top:var(--spacing-sm)}.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:var(--spacing-lg)}.file-card{border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);overflow:hidden;transition:all var(--transition);background:var(--color-bg);position:relative}.file-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.file-card-preview{width:100%;aspect-ratio:1;background:var(--color-hover);display:flex;align-items:center;justify-content:center;overflow:hidden}.file-card-preview img,.file-card-preview video{width:100%;height:100%;object-fit:cover}.file-card-icon{font-size:var(--text-3xl);color:var(--color-accent)}.file-card-info{padding:var(--spacing-sm)}.file-card-name{font-size:var(--text-sm);font-weight:500;margin-bottom:var(--spacing-xs);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-card-meta{font-size:var(--text-xs);color:var(--color-accent);display:flex;justify-content:space-between}.file-card-actions{position:absolute;top:var(--spacing-sm);right:var(--spacing-sm);display:flex;gap:var(--spacing-xs);opacity:0;transition:opacity var(--transition)}.file-card:hover .file-card-actions{opacity:1}.file-card-action{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--color-bg);border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);transition:all var(--transition)}.file-card-action:hover{background:var(--color-fg);color:var(--color-bg)}.loader-overlay{position:fixed;inset:0;background:#ffffffe6;display:flex;align-items:center;justify-content:center;z-index:2000;flex-direction:column;gap:var(--spacing-md)}.loader{width:48px;height:48px;border:4px solid var(--color-border);border-top-color:var(--color-fg);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loader-text{font-size:var(--text-base);color:var(--color-accent)}.progress{width:100%;height:8px;background:var(--color-border);border-radius:var(--border-radius);overflow:hidden}.progress-bar{height:100%;background:var(--color-fg);transition:width var(--transition)}.toast{position:fixed;bottom:var(--spacing-lg);right:var(--spacing-lg);background:var(--color-fg);color:var(--color-bg);padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--border-radius);box-shadow:var(--shadow-lg);z-index:3000;animation:slideInRight .3s ease}@keyframes slideInRight{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.toast.error{background:var(--color-error)}.toast.success{background:var(--color-success)}.filter-group{display:flex;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg);flex-wrap:wrap}.filter-btn{padding:var(--spacing-sm) var(--spacing-md);border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);background:var(--color-bg);color:var(--color-fg);cursor:pointer;transition:all var(--transition);font-size:var(--text-sm)}.filter-btn:hover{background:var(--color-hover)}.filter-btn.active{background:var(--color-fg);color:var(--color-bg);border-color:var(--color-fg)}.empty-state{text-align:center;padding:var(--spacing-2xl);color:var(--color-accent)}.empty-state-icon{font-size:var(--text-3xl);margin-bottom:var(--spacing-md);opacity:.5}.empty-state-text{font-size:var(--text-lg);margin-bottom:var(--spacing-sm)}.empty-state-hint{font-size:var(--text-sm);opacity:.7}