*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f0f2f5;color:#1a1a2e;min-height:100vh}.page{max-width:680px;margin:0 auto;padding:40px 16px}.page-title{font-size:2rem;font-weight:700;text-align:center;margin-bottom:24px;color:#4f46e5;letter-spacing:-.5px}.card{background:#fff;border-radius:16px;box-shadow:0 4px 24px #00000014;overflow:hidden}.todo-form{display:flex;gap:8px;padding:20px;border-bottom:1px solid #f0f0f0}.todo-input{flex:1;padding:10px 14px;font-size:1rem;border:1.5px solid #e0e0e0;border-radius:8px;outline:none;transition:border-color .2s}.todo-input:focus{border-color:#4f46e5}.todo-filters{display:flex;gap:4px;padding:12px 20px;border-bottom:1px solid #f0f0f0;background:#fafafa}.filter-btn{padding:6px 14px;border:1.5px solid transparent;border-radius:20px;background:none;font-size:.875rem;cursor:pointer;color:#666;transition:all .15s}.filter-btn:hover{background:#f0f0f0}.filter-btn.active{background:#4f46e5;color:#fff;border-color:#4f46e5}.filter-count{font-size:.75rem;opacity:.8;margin-left:4px}.todo-list{list-style:none}.todo-list li+li{border-top:1px solid #f0f0f0}.todo-item{display:flex;align-items:center;gap:12px;padding:14px 20px;transition:background .15s}.todo-item:hover{background:#fafafa}.todo-item.completed .todo-title{text-decoration:line-through;color:#aaa}.todo-checkbox{width:18px;height:18px;cursor:pointer;accent-color:#4f46e5;flex-shrink:0}.todo-content{flex:1;min-width:0}.todo-title{font-size:1rem;word-break:break-word}.todo-description{font-size:.8rem;color:#888;margin-top:2px}.todo-edit-input{width:100%;padding:6px 10px;font-size:1rem;border:1.5px solid #4f46e5;border-radius:6px;outline:none}.todo-actions{display:flex;gap:6px;flex-shrink:0}.btn{padding:6px 14px;border:none;border-radius:6px;font-size:.875rem;cursor:pointer;font-weight:500;transition:opacity .15s,transform .1s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:not(:disabled):active{transform:scale(.97)}.btn-primary{background:#4f46e5;color:#fff}.btn-primary:not(:disabled):hover{background:#4338ca}.btn-edit{background:#e0e7ff;color:#4338ca}.btn-edit:not(:disabled):hover{background:#c7d2fe}.btn-save{background:#d1fae5;color:#065f46}.btn-save:not(:disabled):hover{background:#a7f3d0}.btn-cancel{background:#f3f4f6;color:#374151}.btn-cancel:not(:disabled):hover{background:#e5e7eb}.btn-delete{background:#fee2e2;color:#991b1b}.btn-delete:not(:disabled):hover{background:#fecaca}.loading,.empty-state{text-align:center;padding:40px 20px;color:#999;font-size:.95rem}.error-state{text-align:center;padding:32px 20px;color:#dc2626}.error-state p{margin-bottom:12px}