:root{--bg-primary:#fff;--bg-secondary:#f8fafc;--bg-tertiary:#f1f5f9;--bg-hover:#e2e8f0;--bg-card:#fff;--bg-card-rgb:255,255,255;--text-primary:#0f172a;--text-secondary:#475569;--text-tertiary:#94a3b8;--border-color:#e2e8f0;--border-light:#f1f5f9;--accent-primary:#6366f1;--accent-secondary:#818cf8;--accent-bg:#eef2ff;--success:#10b981;--warning:#f59e0b;--error:#ef4444;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a,0 4px 6px -4px #0000001a;--shadow-xl:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--radius-full:9999px;--transition-fast:.15s ease;--transition-base:.2s ease;--transition-slow:.3s ease;--sidebar-width:210px;--header-height:50px}[data-theme=dark]{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--bg-hover:#475569;--bg-card:#1e293b;--bg-card-rgb:30,41,59;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--text-tertiary:#64748b;--border-color:#334155;--border-light:#1e293b;--accent-bg:#312e81;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 6px -1px #0006,0 2px 4px -2px #0000004d;--shadow-lg:0 10px 15px -3px #0006,0 4px 6px -4px #0000004d;--shadow-xl:0 20px 25px -5px #00000080,0 8px 10px -6px #0006}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}h4{font-size:1.125rem}a{color:var(--accent-primary);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--accent-secondary)}button{font-family:inherit;font-size:inherit;cursor:pointer;background:0 0;border:none}.btn{justify-content:center;align-items:center;gap:var(--space-2);padding:var(--space-2)var(--space-4);border-radius:var(--radius-md);transition:all var(--transition-fast);font-weight:500;display:inline-flex}.btn-primary{background:var(--accent-primary);color:#fff}.btn-primary:hover{background:var(--accent-secondary);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover{background:var(--bg-hover)}.btn-ghost{color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg-hover);color:var(--text-primary)}.btn-icon{border-radius:var(--radius-md);width:36px;height:36px;padding:0}input,textarea,select{font-family:inherit;font-size:inherit;padding:var(--space-3)var(--space-4);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);transition:all var(--transition-fast);width:100%}input:focus,textarea:focus,select:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-bg);outline:none}input::placeholder,textarea::placeholder{color:var(--text-tertiary)}.app-layout{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border-color);z-index:100;flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0}.main-content{margin-left:var(--sidebar-width);flex-direction:column;flex:1;height:100vh;display:flex;overflow-y:auto}.header{height:var(--header-height);padding:0 var(--space-6);background:var(--bg-primary);border-bottom:1px solid var(--border-color);z-index:60;justify-content:space-between;align-items:center;display:flex;position:sticky;top:0}.content-area{padding:var(--space-6);flex:1}.sidebar-header{padding:var(--space-5)var(--space-4);border-bottom:1px solid var(--border-color)}.sidebar-logo{align-items:center;gap:var(--space-3);color:var(--text-primary);font-size:1.25rem;font-weight:700;display:flex}.sidebar-logo-icon{background:var(--accent-primary);border-radius:var(--radius-md);color:#fff;justify-content:center;align-items:center;width:32px;height:32px;display:flex}.sidebar-nav{padding:var(--space-4);flex:1;overflow-y:auto}.nav-section{margin-bottom:var(--space-6)}.nav-section-title{text-transform:uppercase;letter-spacing:.05em;color:var(--text-tertiary);padding:var(--space-2)var(--space-3);margin-bottom:var(--space-2);font-size:.75rem;font-weight:600}.nav-item{align-items:center;gap:var(--space-3);padding:var(--space-2)var(--space-3);border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition-fast);cursor:pointer;text-align:left;width:100%;padding-right:var(--space-8);display:flex;position:relative}.nav-item:hover{background:var(--bg-hover);color:var(--text-primary)}.nav-item.active{background:var(--accent-bg);color:var(--accent-primary)}.nav-item-expand{width:16px;height:16px;color:var(--text-tertiary);cursor:pointer;margin-right:calc(var(--space-1)*-1);transition:color var(--transition-fast);flex-shrink:0;justify-content:center;align-items:center;font-size:.625rem;display:flex}.nav-item-expand:hover{color:var(--accent-primary)}.nav-item-delete{opacity:0;padding:var(--space-1);border-radius:var(--radius-sm);transition:opacity var(--transition-fast),background var(--transition-fast);right:var(--space-2);font-size:.75rem;position:absolute;top:50%;transform:translateY(-50%)}.nav-item:hover .nav-item-delete{opacity:1}.nav-item-delete:hover{background:#ef444433}.nav-item-icon{flex-shrink:0;justify-content:center;align-items:center;width:24px;display:flex}.nav-item-label{flex:1;font-weight:500}.nav-item-count{color:var(--text-tertiary);background:var(--bg-tertiary);border-radius:var(--radius-full);text-align:center;min-width:24px;right:var(--space-3);transition:transform var(--transition-fast),opacity var(--transition-fast);margin-left:auto;padding:2px 8px;font-size:.75rem;font-weight:600;position:absolute;top:50%;transform:translateY(-50%)}.nav-item:hover .nav-item-count{opacity:.5;transform:translateY(-50%)translate(-24px)}.sidebar-footer{padding:var(--space-4);border-top:1px solid var(--border-color);gap:var(--space-2);flex-direction:column;display:flex}.user-info{align-items:center;gap:var(--space-3);margin-bottom:var(--space-2);display:flex}.user-avatar{border-radius:50%;width:32px;height:32px}.user-details{flex:1;min-width:0}.user-name{white-space:nowrap;text-overflow:ellipsis;font-size:.875rem;font-weight:500;overflow:hidden}.user-status{color:var(--text-tertiary);font-size:.7rem}.search-bar{flex:1;max-width:400px;position:relative}.search-bar input{background:var(--bg-secondary);padding-left:44px}.search-bar-icon{color:var(--text-tertiary);pointer-events:none;position:absolute;top:50%;left:14px;transform:translateY(-50%)}.header-actions{align-items:center;gap:var(--space-3);display:flex}.view-toggle{background:var(--bg-secondary);border-radius:var(--radius-md);gap:4px;padding:4px;display:flex}.view-toggle-btn{border-radius:var(--radius-sm);width:32px;height:32px;color:var(--text-tertiary);transition:all var(--transition-fast);justify-content:center;align-items:center;display:flex}.view-toggle-btn:hover{color:var(--text-primary)}.view-toggle-btn.active{background:var(--bg-primary);color:var(--accent-primary);box-shadow:var(--shadow-sm)}.bookmark-grid{gap:var(--space-3);grid-template-columns:repeat(auto-fill,minmax(180px,1fr));display:grid}.bookmark-grid.view-list{grid-template-columns:1fr}.bookmark-grid.view-compact{gap:var(--space-4);grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}.bookmark-grid.view-compact .bookmark-card-description{display:none}.bookmark-grid.view-compact .bookmark-card-title{margin-bottom:var(--space-1);font-size:.875rem}.bookmark-grid.view-compact .bookmark-card-body{padding:var(--space-3)}.bookmark-grid.view-compact .bookmark-card-tags{display:none}.bookmark-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-base);cursor:pointer;overflow:hidden}.bookmark-card:hover{box-shadow:var(--shadow-lg);border-color:var(--accent-primary);transform:translateY(-2px)}.bookmark-card-thumbnail{aspect-ratio:16/10;background:var(--bg-tertiary);justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.bookmark-card-thumbnail img{object-fit:cover;width:100%;height:100%}.bookmark-card-thumbnail-placeholder{color:var(--text-tertiary);font-size:3rem}.bookmark-card-badge{bottom:var(--space-2);left:var(--space-2);background:rgba(var(--bg-card-rgb),.9);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border:1px solid var(--border-color);border-radius:var(--radius-sm);align-items:center;gap:var(--space-1);color:var(--text-secondary);box-shadow:var(--shadow-sm);box-shadow:var(--shadow-sm);max-width:calc(100% - var(--space-3));padding:2px 8px;font-size:.7rem;font-weight:600;display:flex;position:absolute}.bookmark-card-badge span{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.bookmark-card-domain{align-items:center;gap:var(--space-2);color:var(--text-tertiary);margin-bottom:2px;font-size:.75rem;display:flex}.bookmark-card-collection-badge{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-secondary);white-space:nowrap;margin-left:auto;padding:1px 4px;font-size:.65rem;font-weight:500}.bookmark-card-domain img{border-radius:2px;width:14px;height:14px}.bookmark-card-title{color:var(--text-primary);line-clamp:2;margin-bottom:2px;font-size:.9rem;font-weight:600;overflow:hidden}.bookmark-card-description{color:var(--text-secondary);line-clamp:1;margin-bottom:var(--space-2);font-size:.875rem;overflow:hidden}.bookmark-card-tags{gap:var(--space-2);flex-wrap:wrap;display:flex}.tag{background:var(--accent-bg);color:var(--accent-primary);border-radius:var(--radius-full);padding:2px 8px;font-size:.75rem;font-weight:500}.view-list .bookmark-card{flex-direction:row;display:flex}.view-list .bookmark-card-thumbnail{aspect-ratio:auto;width:200px;height:100%;min-height:120px}.view-list .bookmark-card-body{flex-direction:column;flex:1;justify-content:center;display:flex}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;opacity:0;animation:fadeIn var(--transition-base)forwards;background:#00000080;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}@keyframes fadeIn{to{opacity:1}}.modal{background:var(--bg-card);border-radius:var(--radius-xl);width:100%;max-width:500px;max-height:90vh;box-shadow:var(--shadow-xl);animation:slideUp var(--transition-base)forwards;overflow-y:auto;transform:scale(.95)}@keyframes slideUp{to{transform:scale(1)}}.modal-header{padding:var(--space-5)var(--space-6);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;display:flex}.modal-title{font-size:1.25rem;font-weight:600}.modal-body{padding:var(--space-6)}.modal-footer{padding:var(--space-4)var(--space-6);border-top:1px solid var(--border-color);justify-content:flex-end;gap:var(--space-3);display:flex}.form-group{margin-bottom:var(--space-5)}.form-label{color:var(--text-secondary);margin-bottom:var(--space-2);font-size:.875rem;font-weight:500;display:block}.tags-input{gap:var(--space-2);padding:var(--space-2);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);flex-wrap:wrap;min-height:44px;display:flex}.tags-input:focus-within{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-bg)}.tags-input .tag{align-items:center;gap:var(--space-1);display:flex}.tags-input .tag-remove{cursor:pointer;border-radius:50%;justify-content:center;align-items:center;width:14px;height:14px;font-size:12px;line-height:1;display:flex}.tags-input .tag-remove:hover{background:var(--accent-primary);color:#fff}.tags-input input{min-width:120px;padding:var(--space-1);background:0 0;border:none;flex:1}.tags-input input:focus{box-shadow:none;outline:none}.empty-state{text-align:center;padding:var(--space-12);color:var(--text-tertiary)}.empty-state-icon{margin-bottom:var(--space-4);font-size:4rem}.empty-state-title{color:var(--text-secondary);margin-bottom:var(--space-2);font-size:1.25rem;font-weight:600}.empty-state-description{margin-bottom:var(--space-6);font-size:.875rem}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.add-button{width:100%;padding:var(--space-3);justify-content:center;align-items:center;gap:var(--space-2);background:var(--accent-primary);color:#fff;border-radius:var(--radius-md);transition:all var(--transition-fast);font-weight:500;display:flex}.add-button:hover{background:var(--accent-secondary);box-shadow:var(--shadow-md);transform:translateY(-1px)}.collection-form{gap:var(--space-2);margin-bottom:var(--space-4);display:flex}.collection-form input{flex:1}.bookmark-card-actions{top:var(--space-2);right:var(--space-2);gap:var(--space-1);opacity:0;transition:opacity var(--transition-fast);display:flex;position:absolute}.bookmark-card:hover .bookmark-card-actions{opacity:1}.bookmark-card-actions .btn-icon{background:rgba(var(--bg-card-rgb),.8);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border:1px solid var(--border-color);width:32px;height:32px;color:var(--text-primary);box-shadow:var(--shadow-md)}.bookmark-card-actions .btn-icon:hover{background:var(--bg-primary);color:var(--accent-primary);transform:scale(1.1)}.bookmark-card-actions .btn-icon[title=Delete]:hover{color:var(--error);border-color:#ef444466}@media (max-width:768px){.sidebar{transform:translate(-100%)}.main-content{margin-left:0}.bookmark-grid{grid-template-columns:1fr}.bookmark-grid.view-compact{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.view-list .bookmark-card{flex-direction:column}.view-list .bookmark-card-thumbnail{aspect-ratio:16/10;width:100%;height:auto}}@media (max-width:1024px){.bookmark-grid.view-compact{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}}.drop-zone{flex-direction:column;flex:1;display:flex;position:relative}.drop-zone-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border:3px dashed var(--accent-primary);border-radius:var(--radius-lg);z-index:200;background:#6366f11a;justify-content:center;align-items:center;animation:1.5s ease-in-out infinite dropZonePulse;display:flex;position:absolute;inset:0}@keyframes dropZonePulse{0%,to{border-color:var(--accent-primary);background:#6366f11a}50%{border-color:var(--accent-secondary);background:#6366f133}}.drop-zone-content{text-align:center;padding:var(--space-8)}.drop-zone-icon{margin-bottom:var(--space-4);font-size:4rem;animation:1s ease-in-out infinite dropZoneBounce}@keyframes dropZoneBounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.drop-zone-text{color:var(--accent-primary);margin-bottom:var(--space-2);font-size:1.5rem;font-weight:600}.drop-zone-subtext{color:var(--text-secondary);font-size:.875rem}.drop-notification{bottom:var(--space-6);right:var(--space-6);background:var(--success);color:#fff;padding:var(--space-3)var(--space-5);border-radius:var(--radius-md);align-items:center;gap:var(--space-2);box-shadow:var(--shadow-lg);z-index:1000;font-weight:500;animation:.3s ease-out slideInRight;display:flex;position:fixed}@keyframes slideInRight{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}.drop-notification-icon{font-size:1.25rem}.import-instructions{margin-bottom:var(--space-6)}.import-instructions h3{margin-bottom:var(--space-3);color:var(--text-primary);font-size:1rem}.import-instructions ol{padding-left:var(--space-5);color:var(--text-secondary);font-size:.875rem;line-height:1.8}.import-instructions li{margin-bottom:var(--space-2)}.import-dropzone{border:2px dashed var(--border-color);border-radius:var(--radius-lg);padding:var(--space-10);text-align:center;cursor:pointer;transition:all var(--transition-base)}.import-dropzone:hover{border-color:var(--accent-primary);background:var(--accent-bg)}.import-dropzone-icon{margin-bottom:var(--space-3);font-size:3rem}.import-dropzone-text{color:var(--text-primary);margin-bottom:var(--space-2);font-size:1rem;font-weight:500}.import-dropzone-hint{color:var(--text-tertiary);font-size:.875rem}.import-result{text-align:center;padding:var(--space-8);border-radius:var(--radius-lg)}.import-result.import-success{background:#10b9811a}.import-result.import-error{background:#ef44441a}.import-result-icon{margin-bottom:var(--space-4);font-size:3rem}.import-success .import-result-icon{color:var(--success)}.import-error .import-result-icon{color:var(--error)}.import-result-title{margin-bottom:var(--space-4);font-size:1.25rem;font-weight:600}.import-result-message{color:var(--text-secondary);font-size:.875rem}.import-result-stats{justify-content:center;gap:var(--space-8);display:flex}.import-stat{flex-direction:column;align-items:center;display:flex}.import-stat-number{color:var(--success);font-size:2rem;font-weight:700}.import-stat-label{color:var(--text-secondary);font-size:.875rem}.bulk-action-bar{padding:var(--space-3)var(--space-6);background:var(--accent-bg);border-bottom:1px solid var(--border-color);top:var(--header-height);z-index:50;justify-content:space-between;align-items:center;animation:.2s ease-out slideDown;display:flex;position:sticky}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.bulk-action-left{align-items:center;gap:var(--space-4);display:flex}.bulk-action-right{align-items:center;gap:var(--space-3);display:flex}.bulk-action-count{color:var(--accent-primary);font-weight:600}.bulk-action-move{position:relative}.bulk-action-dropdown{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);min-width:200px;box-shadow:var(--shadow-lg);z-index:100;max-height:300px;position:absolute;top:100%;left:0;overflow-y:auto}.bulk-action-dropdown-item{align-items:center;gap:var(--space-2);padding:var(--space-3)var(--space-4);text-align:left;width:100%;color:var(--text-primary);cursor:pointer;transition:background var(--transition-fast);background:0 0;border:none;display:flex}.bulk-action-dropdown-item:hover{background:var(--bg-hover)}.bulk-action-delete{color:var(--error)}.bulk-action-delete:hover{background:#ef44441a}.bookmark-card.selected{outline:2px solid var(--accent-primary);outline-offset:2px;background:var(--accent-bg)}.nav-item.drag-over{background:var(--accent-bg);outline:2px dashed var(--accent-primary);outline-offset:-2px}.toast-container{bottom:var(--space-6);right:var(--space-6);z-index:1000;gap:var(--space-2);flex-direction:column;display:flex;position:fixed}.toast{justify-content:space-between;align-items:center;gap:var(--space-4);padding:var(--space-3)var(--space-4);border-radius:var(--radius-md);background:var(--bg-primary);border:1px solid var(--border-color);box-shadow:var(--shadow-lg);cursor:pointer;min-width:200px;animation:.3s ease-out slideInRight;display:flex}.toast-success{border-left:4px solid var(--success)}.toast-error{border-left:4px solid var(--error)}.toast-info{border-left:4px solid var(--accent-primary)}.toast-message{color:var(--text-primary);font-size:.875rem;font-weight:500}.toast-close{color:var(--text-tertiary);cursor:pointer;padding:var(--space-1);background:0 0;border:none}.tag-list{flex-direction:column;display:flex}.tag-item-wrapper{position:relative}.tag-item{font-size:.8125rem;padding:var(--space-2)var(--space-4)!important}.tag-item-actions{gap:var(--space-1);opacity:0;transition:opacity var(--transition-fast);background:var(--bg-secondary);border-radius:var(--radius-sm);z-index:2;box-shadow:var(--shadow-sm);margin-left:auto;padding:2px 4px;display:flex}.nav-item:hover .tag-item-actions{opacity:1}.tag-action-btn{border-radius:var(--radius-sm);width:20px;height:20px;color:var(--text-tertiary);transition:all var(--transition-fast);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;display:flex}.tag-action-btn:hover{color:var(--accent-primary);background:var(--accent-bg)}.tag-action-btn.delete:hover{color:var(--error);background:#ef44441a}.bookmark-card-tags{gap:var(--space-1);margin-top:var(--space-2);flex-wrap:wrap;display:flex}.bookmark-card-tag{background:var(--bg-tertiary);color:var(--text-tertiary);border:1px solid var(--border-color);text-overflow:ellipsis;white-space:nowrap;border-radius:4px;max-width:80px;padding:1px 6px;font-size:.6875rem;overflow:hidden}.bookmark-card-tag-more{color:var(--accent-primary);align-self:center;padding-left:2px;font-size:.6875rem;font-weight:600}.nav-item-empty{padding:var(--space-4);color:var(--text-tertiary);text-align:center;font-size:.8125rem;font-style:italic}.tag-selection-grid{gap:var(--space-2);margin-top:var(--space-2);max-height:200px;padding:var(--space-2);background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border-color);flex-wrap:wrap;display:flex;overflow-y:auto}.tag-chip{padding:var(--space-1)var(--space-3);background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);border-radius:100px;font-size:.75rem}.tag-chip:hover{border-color:var(--accent-primary);color:var(--accent-primary)}.tag-chip.active{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff}.bookmark-card-favorite{top:var(--space-2);left:var(--space-2);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);color:#fff;cursor:pointer;width:32px;height:32px;transition:all var(--transition-fast);z-index:10;opacity:0;background:#0006;border:1px solid #fff3;border-radius:50%;justify-content:center;align-items:center;display:flex;position:absolute;transform:scale(.8)}.bookmark-card:hover 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