:root{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--text-primary: #1e293b;--text-secondary: #64748b;--border-color: #e2e8f0;--primary: #3b82f6;--primary-hover: #2563eb;--primary-light: #eff6ff;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--overdue: #fef2f2;--shadow-sm: 0 1px 2px rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1);--radius: 8px}body.dark{--bg-primary: #0f172a;--bg-secondary: #1e293b;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--border-color: #334155;--primary: #60a5fa;--primary-hover: #3b82f6;--primary-light: #1e3a5f;--overdue: #450a0a;--shadow-sm: 0 1px 2px rgba(0,0,0,.3);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.4)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg-primary);min-height:100vh;color:var(--text-primary);transition:background-color .3s ease,color .3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg-primary);min-height:100vh;color:var(--text-primary)}#root{width:100%;max-width:800px;margin:0 auto;padding:20px}.app{background:var(--bg-secondary);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-md);transition:background-color .3s ease}.app-header{margin-bottom:24px}.app-header h1{font-size:1.75rem;color:var(--text-primary);margin-bottom:16px;font-weight:700}.header-content{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.dark-mode-toggle{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius);width:40px;height:40px;font-size:1.5rem;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center}.dark-mode-toggle:hover{border-color:var(--primary);transform:scale(1.05)}.view-tabs{display:flex;gap:8px;margin-bottom:20px}.tab{flex:1;padding:10px 16px;border:2px solid var(--border-color);background:var(--bg-secondary);color:var(--text-secondary);border-radius:var(--radius);cursor:pointer;font-weight:600;transition:all .2s}.tab:hover{border-color:var(--primary);color:var(--primary)}.tab.active{background:var(--primary);border-color:var(--primary);color:#fff}.todo-form-enhanced{margin-bottom:24px;padding:20px;background:var(--primary-light);border-radius:var(--radius);border:1px solid var(--border-color)}.form-group{margin-bottom:16px}.todo-input-main{width:100%;padding:12px 16px;border:2px solid var(--border-color);border-radius:var(--radius);font-size:1rem;transition:border-color .2s,background-color .3s ease,color .3s ease;background:var(--bg-secondary);color:var(--text-primary)}.todo-input-main:focus{outline:none;border-color:var(--primary)}.form-row{display:flex;gap:12px;margin-bottom:12px}.form-field{flex:1}.form-field label{display:block;font-size:.85rem;color:var(--text-secondary);margin-bottom:4px}.form-control{width:100%;padding:8px 12px;border:1px solid var(--border-color);border-radius:var(--radius);font-size:.95rem;background:var(--bg-secondary);color:var(--text-primary);transition:background-color .3s ease,color .3s ease,border-color .2s}.form-control:focus{outline:none;border-color:var(--primary)}.form-notes-toggle{margin-bottom:8px}.notes-toggle-btn{background:none;border:none;color:var(--primary);font-size:.9rem;cursor:pointer;padding:0;text-decoration:underline}.todo-notes-input{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:var(--radius);font-size:.95rem;resize:vertical;min-height:80px;background:var(--bg-secondary);color:var(--text-primary);font-family:inherit;transition:background-color .3s ease,color .3s ease}.todo-notes-input:focus{outline:none;border-color:var(--primary)}.form-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:16px}.submit-button{padding:10px 24px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:.95rem;font-weight:600;cursor:pointer;transition:background .2s}.submit-button:hover{background:var(--primary-hover)}.submit-button:disabled{background:var(--text-secondary);cursor:not-allowed}.cancel-button{padding:10px 24px;background:transparent;color:var(--text-secondary);border:1px solid var(--border-color);border-radius:var(--radius);font-size:.95rem;cursor:pointer}.cancel-button:hover{background:var(--bg-primary)}.error-message{background:#fef2f2;color:var(--danger);padding:12px;border-radius:var(--radius);margin-bottom:16px;text-align:center;font-size:.9rem;border:1px solid #fecaca}.loading-message{text-align:center;color:var(--text-secondary);padding:40px 0;font-size:1rem}.todo-list-enhanced{list-style:none;display:flex;flex-direction:column;gap:12px}.todo-item-enhanced{display:flex;align-items:flex-start;gap:12px;padding:16px;border:1px solid var(--border-color);border-radius:var(--radius);background:var(--bg-secondary);transition:box-shadow .2s}.todo-item-enhanced:hover{box-shadow:var(--shadow-sm)}.todo-item-enhanced.completed{opacity:.7;background:var(--bg-primary)}.todo-item-enhanced.overdue{border-left:3px solid var(--danger)}.todo-checkbox{width:20px;height:20px;cursor:pointer;margin-top:2px}.todo-content{flex:1}.todo-header{display:flex;align-items:center;gap:8px;margin-bottom:8px}.todo-text{font-size:1rem;color:var(--text-primary);word-break:break-word;flex:1}.todo-text.strikethrough{text-decoration:line-through;color:var(--text-secondary)}.priority-indicator{width:8px;height:8px;border-radius:50%;flex-shrink:0}.todo-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}.category-badge{padding:2px 8px;background:var(--primary-light);color:var(--primary);border:1px solid var(--primary);border-radius:12px;font-size:.75rem;font-weight:600}.due-date-badge{display:inline-flex;align-items:center;gap:4px;padding:2px 8px;background:var(--bg-primary);color:var(--text-secondary);border-radius:12px;font-size:.75rem}.due-date-badge.overdue{background:var(--overdue);color:var(--danger);font-weight:600}.todo-notes-section{margin-top:8px}.notes-toggle{background:none;border:none;color:var(--primary);font-size:.85rem;cursor:pointer;padding:0;text-decoration:underline}.notes-content{margin-top:8px;padding:12px;background:var(--bg-primary);border-radius:var(--radius);font-size:.9rem;color:var(--text-primary);white-space:pre-wrap;line-height:1.5}.todo-actions{display:flex;gap:8px}.edit-button,.delete-button{background:none;border:none;cursor:pointer;font-size:1.2rem;padding:4px 8px;transition:opacity .2s}.edit-button:hover{opacity:.7}.delete-button{color:var(--danger)}.search-filter{margin-bottom:24px;padding:16px;background:var(--bg-primary);border-radius:var(--radius);border:1px solid var(--border-color)}.month-year-filter{margin-bottom:16px;padding:12px 16px;background:var(--bg-primary);border-radius:var(--radius);border:1px solid var(--border-color);display:flex;align-items:center;gap:12px;flex-wrap:wrap}.filter-label{font-size:.9rem;font-weight:600;color:var(--text-secondary)}.month-select,.year-select{padding:6px 12px;border:1px solid var(--border-color);border-radius:var(--radius);font-size:.9rem;background:var(--bg-secondary);color:var(--text-primary);cursor:pointer}.month-select:focus,.year-select:focus{outline:none;border-color:var(--primary)}.month-select{min-width:120px}.year-select{width:80px}.search-bar{margin-bottom:12px}.search-input{width:100%;padding:10px 14px;border:1px solid var(--border-color);border-radius:var(--radius);font-size:.95rem;background:var(--bg-secondary);color:var(--text-primary);transition:border-color .2s,background-color .3s ease,color .3s ease}.search-input:focus{outline:none;border-color:var(--primary)}.filter-controls{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.filter-select{padding:8px 12px;border:1px solid var(--border-color);border-radius:var(--radius);font-size:.9rem;background:var(--bg-secondary);min-width:140px}.priority-filters{display:flex;gap:8px}.priority-checkbox{display:flex;align-items:center;gap:4px;font-size:.85rem;cursor:pointer}.priority-pill{padding:3px 10px;border-radius:12px;font-weight:600;font-size:.8rem}.priority-pill.low{background:#d1fae5;color:#065f46}.priority-pill.medium{background:#fef3c7;color:#92400e}.priority-pill.high{background:#fee2e2;color:#991b1b}.show-completed{display:flex;align-items:center;gap:6px;font-size:.9rem;cursor:pointer;margin-left:auto}.date-filter-info{margin:16px 0;padding:12px;background:var(--primary-light);border-radius:var(--radius);display:flex;align-items:center;gap:12px;font-size:.95rem}.clear-filter{background:none;border:none;color:var(--primary);cursor:pointer;font-size:.9rem;text-decoration:underline}.calendar{margin-bottom:24px;border:1px solid var(--border-color);border-radius:var(--radius);padding:16px;background:var(--bg-secondary)}.calendar-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.calendar-nav-btn{background:var(--bg-primary);border:1px solid var(--border-color);width:36px;height:36px;border-radius:var(--radius);font-size:1.2rem;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center}.calendar-nav-btn:hover{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}.calendar-title-group{display:flex;gap:8px;align-items:center}.calendar-month-select,.calendar-year-select{padding:6px 10px;border:1px solid var(--border-color);border-radius:var(--radius);font-size:.9rem;background:var(--bg-secondary);color:var(--text-primary);cursor:pointer}.calendar-month-select{min-width:100px}.calendar-year-select{width:70px}.calendar-month-select:focus,.calendar-year-select:focus{outline:none;border-color:var(--primary)}.calendar-weekdays{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;margin-bottom:8px}.calendar-weekday{text-align:center;font-size:.8rem;font-weight:600;color:var(--text-secondary);padding:8px 0}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px}.calendar-day{min-height:60px;border-radius:var(--radius);padding:6px;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-start;cursor:pointer;transition:background-color .2s,background-color .3s ease;position:relative;gap:2px;overflow:hidden}.calendar-day.empty{cursor:default;background:transparent}.calendar-day.has-date{background:var(--bg-primary)}.calendar-day.has-date:hover{background:var(--primary-light)}.calendar-day.today{border:2px solid var(--primary)}.day-number{font-size:.85rem;font-weight:600;color:var(--text-primary);flex-shrink:0}.day-todos{display:flex;flex-direction:column;gap:2px;width:100%;overflow:hidden;margin-top:2px}.day-todo-title{font-size:.7rem;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.2;padding:1px 4px;border-radius:3px;background:var(--primary-light);transition:background-color .3s ease,color .3s ease}.day-todo-title.completed{text-decoration:line-through;opacity:.6;background:transparent}.more-todos{font-size:.65rem;color:var(--text-secondary);text-align:center;padding:1px;font-style:italic}.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;padding:20px}.modal-content{background:var(--bg-secondary);border-radius:var(--radius);max-width:500px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-md)}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--border-color)}.modal-header h3{font-size:1.1rem;color:var(--text-primary)}.modal-close{background:none;border:none;font-size:1.5rem;color:var(--text-secondary);cursor:pointer;padding:0;line-height:1}.modal-close:hover{color:var(--danger)}.modal-body{padding:20px}.empty-message{text-align:center;color:var(--text-secondary);padding:40px 20px;font-size:1rem}.form-error{color:var(--danger);font-size:.85rem;margin-top:8px;text-align:center}@media (max-width: 600px){#root{padding:10px}.app{padding:16px}.form-row{flex-direction:column}.filter-controls{flex-direction:column;align-items:stretch}.show-completed{margin-left:0;margin-top:8px}.calendar-day{min-height:50px;padding:4px}.day-number{font-size:.75rem}.day-todo-title{font-size:.65rem}}