:root{--bg-gradient-start: #667eea;--bg-gradient-end: #764ba2;--card-bg: white;--card-shadow: 0 25px 50px -12px rgba(0, 0, 0, .25);--text-primary: #2d3748;--text-secondary: #718096;--text-muted: #a0aec0;--input-bg: white;--input-border: #e2e8f0;--input-border-hover: #cbd5e0;--input-border-focus: #667eea;--stat-bg: #f7fafc;--task-bg: #f7fafc;--task-bg-hover: #edf2f7;--btn-secondary-bg: #edf2f7;--btn-secondary-hover: #e2e8f0;--btn-secondary-text: #4a5568}html.dark{--bg-gradient-start: #1a1a2e;--bg-gradient-end: #16213e;--card-bg: #1e293b;--card-shadow: 0 25px 50px -12px rgba(0, 0, 0, .5);--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--input-bg: #334155;--input-border: #475569;--input-border-hover: #64748b;--input-border-focus: #818cf8;--stat-bg: #334155;--task-bg: #334155;--task-bg-hover: #475569;--btn-secondary-bg: #475569;--btn-secondary-hover: #64748b;--btn-secondary-text: #e2e8f0}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,var(--bg-gradient-start) 0%,var(--bg-gradient-end) 100%);min-height:100vh;color:var(--text-primary);line-height:1.6;padding:2rem;transition:background .3s ease}.container{max-width:900px;margin:0 auto;background:var(--card-bg);border-radius:20px;padding:2rem;box-shadow:var(--card-shadow);transition:background .3s ease,box-shadow .3s ease}.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}h1{color:var(--text-primary);font-size:2rem;margin:0}.dark-mode-toggle{width:44px;height:44px;border-radius:50%;background:var(--btn-secondary-bg);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:none;padding:0;transition:all .2s ease}.dark-mode-toggle:hover{background:var(--btn-secondary-hover);transform:scale(1.1);box-shadow:none}.dark-mode-toggle .icon{font-size:1.25rem}.loading-bar{height:3px;background:linear-gradient(90deg,var(--bg-gradient-start),var(--bg-gradient-end),var(--bg-gradient-start));background-size:200% 100%;animation:loading 1.5s infinite;border-radius:2px;margin-bottom:1rem}@keyframes loading{0%{background-position:200% 0}to{background-position:-200% 0}}.stats{display:flex;justify-content:center;gap:1.5rem;margin-bottom:1.5rem;padding:1rem;background:var(--stat-bg);border-radius:12px;transition:background .3s ease}.stat{text-align:center;font-size:.875rem;color:var(--text-secondary)}.stat strong{display:block;font-size:1.5rem;color:var(--text-primary)}.stat.open strong{color:#ed8936}.stat.done strong{color:#48bb78}.search-container{position:relative;margin-bottom:1rem}.search-input{width:100%;padding:1rem 3rem 1rem 2.75rem;border:2px solid var(--input-border);border-radius:12px;font-size:1rem;background:var(--input-bg);color:var(--text-primary);transition:all .2s ease}.search-input:hover{border-color:var(--input-border-hover)}.search-input:focus{outline:none;border-color:var(--input-border-focus);box-shadow:0 0 0 4px #667eea26}.search-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);font-size:1rem;pointer-events:none}.search-clear{position:absolute;right:.75rem;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:50%;background:var(--btn-secondary-bg);border:none;cursor:pointer;font-size:.875rem;padding:0;display:flex;align-items:center;justify-content:center;box-shadow:none;color:var(--text-secondary)}.search-clear:hover{background:var(--btn-secondary-hover);transform:translateY(-50%) scale(1.1);box-shadow:none}.filter-buttons{display:flex;gap:.5rem;margin-bottom:1.5rem}.filter-buttons button{flex:1;padding:.75rem 1rem;font-size:.875rem;background:var(--btn-secondary-bg);color:var(--btn-secondary-text);box-shadow:none;text-transform:none;letter-spacing:normal;border-radius:10px;transition:all .2s ease}.filter-buttons button:hover{background:var(--btn-secondary-hover);transform:none;box-shadow:none}.filter-buttons button.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.task-form{display:flex;gap:.75rem;margin-bottom:1.5rem}.input-wrapper{flex:1;position:relative}.input-wrapper input{width:100%;padding:1rem 1.25rem 1rem 2.75rem;border:2px solid var(--input-border);border-radius:12px;font-size:1rem;background:var(--input-bg);color:var(--text-primary);transition:all .2s ease}.input-wrapper input::placeholder{color:var(--text-muted)}.input-wrapper input:hover{border-color:var(--input-border-hover)}.input-wrapper input:focus{outline:none;border-color:var(--input-border-focus);box-shadow:0 0 0 4px #667eea26}.input-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);font-size:1rem;pointer-events:none}.task-form button{padding:1rem 1.5rem;white-space:nowrap;min-width:130px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea66}.task-form button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea80}.spinner{width:20px;height:20px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.task-list{list-style:none}.task-item{display:flex;align-items:center;gap:.75rem;padding:1rem;background:var(--task-bg);border-radius:12px;margin-bottom:.5rem;transition:all .2s ease}.task-item:hover{background:var(--task-bg-hover)}.task-item.completed{opacity:.6}.task-item.completed .task-text{text-decoration:line-through;color:var(--text-muted)}.task-checkbox{width:22px;height:22px;cursor:pointer;accent-color:#667eea}.task-text{flex:1;font-size:1rem;color:var(--text-primary)}.task-edit-btn,.task-delete-btn{padding:.5rem .75rem;font-size:.75rem;border-radius:8px;text-transform:none;letter-spacing:normal;border:none;cursor:pointer;transition:all .2s ease}.task-edit-btn{background:var(--btn-secondary-bg);color:var(--btn-secondary-text);box-shadow:none}.task-edit-btn:hover{background:var(--btn-secondary-hover);transform:none;box-shadow:none}.task-delete-btn{background:#fed7d7;color:#c53030;box-shadow:none}html.dark .task-delete-btn{background:#ef444433;color:#fca5a5}.task-delete-btn:hover{background:#feb2b2;transform:none;box-shadow:none}html.dark .task-delete-btn:hover{background:#ef44444d}.filter-open .task-item.completed,.filter-done .task-item:not(.completed){display:none}.empty-state{text-align:center;padding:2rem;color:var(--text-muted);font-style:italic}.error-message{text-align:center;padding:1rem;color:#c53030;background:#fed7d7;border-radius:8px}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;backdrop-filter:blur(4px)}.modal{background:var(--card-bg);padding:2rem;border-radius:16px;width:90%;max-width:400px;box-shadow:0 25px 50px -12px #00000040}.modal h3{margin-bottom:1rem;color:var(--text-primary)}.modal p{margin-bottom:1.5rem;color:var(--text-secondary)}.modal input{width:100%;padding:1rem;border:2px solid var(--input-border);border-radius:12px;font-size:1rem;margin-bottom:1rem;background:var(--input-bg);color:var(--text-primary);transition:all .2s ease}.modal input:focus{outline:none;border-color:var(--input-border-focus);box-shadow:0 0 0 4px #667eea26}.modal-actions{display:flex;gap:.75rem;justify-content:flex-end}.btn-cancel,.btn-save,.btn-delete{padding:.75rem 1.25rem;border-radius:10px;font-size:.875rem;font-weight:600;border:none;cursor:pointer;transition:all .2s ease}.btn-cancel{background:var(--btn-secondary-bg);color:var(--btn-secondary-text);box-shadow:none}.btn-cancel:hover{background:var(--btn-secondary-hover);transform:none;box-shadow:none}.btn-save{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 4px 15px #667eea66}.btn-save:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea80}.btn-delete{background:#e53e3e;color:#fff;box-shadow:0 4px 15px #e53e3e66}.btn-delete:hover{background:#c53030;transform:translateY(-2px);box-shadow:0 6px 20px #e53e3e80}.success-banner{position:fixed;top:1rem;right:1rem;background:#48bb78;color:#fff;padding:1rem 1.5rem;border-radius:12px;box-shadow:0 4px 15px #48bb7866;font-weight:500;z-index:1001}.kanban-board{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:1rem}@media(max-width:768px){.kanban-board{grid-template-columns:1fr}}.kanban-column{background:var(--stat-bg);border-radius:12px;padding:1rem;min-height:200px;transition:all .2s ease}.kanban-column.drag-over{background:var(--task-bg-hover);box-shadow:inset 0 0 0 2px var(--input-border-focus)}.column-header{display:flex;align-items:center;gap:.5rem;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:3px solid}.column-icon{font-size:1.25rem}.column-header h3{flex:1;font-size:.9rem;font-weight:600;color:var(--text-primary);margin:0}.column-count{display:flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;font-size:.75rem;font-weight:600;color:#fff}.column-tasks{display:flex;flex-direction:column;gap:.5rem}.kanban-task{background:var(--card-bg);border-radius:8px;padding:.75rem;cursor:grab;transition:all .2s ease;box-shadow:0 1px 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.5rem;border-radius:4px;color:#fff;text-transform:uppercase}.due-date{font-size:.75rem;color:var(--text-muted)}.task-description{font-size:.8rem;color:var(--text-secondary);margin:.5rem 0;line-height:1.4}.priority-select-input{padding:1rem 1.25rem;border:2px solid var(--input-border);border-radius:12px;font-size:1rem;background:var(--input-bg);color:var(--text-primary);cursor:pointer;transition:all .2s ease;min-width:120px}.priority-select-input:hover{border-color:var(--input-border-hover)}.priority-select-input:focus{outline:none;border-color:var(--input-border-focus);box-shadow:0 0 0 4px #667eea26}.modal-large{max-width:500px}.form-group{margin-bottom:1.25rem}.form-group label{display:block;margin-bottom:.5rem;font-size:.8rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.form-input,.form-textarea,.form-select,.edit-form input[type=text],.edit-form input[type=date],.edit-form 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