*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f0f2f5;min-height:100vh;color:#333}.app{max-width:560px;margin:0 auto;padding:48px 16px 80px}.app-title{text-align:center;font-size:3rem;font-weight:700;letter-spacing:.2em;color:#d9534f;margin-bottom:32px;opacity:.9}.todo-card{background:#fff;border-radius:8px;box-shadow:0 2px 16px #00000014;overflow:hidden}.todo-input-form{display:flex;border-bottom:1px solid #eee}.todo-input{flex:1;padding:16px 20px;font-size:1rem;border:none;outline:none;background:transparent}.todo-input::placeholder{color:#bbb}.btn{border:none;cursor:pointer;font-size:.875rem;transition:background .15s,color .15s;background:transparent}.btn-primary{padding:0 20px;background:#d9534f;color:#fff;font-weight:600;font-size:.9rem}.btn-primary:hover{background:#c9302c}.todo-list{list-style:none}.todo-item{display:flex;align-items:center;padding:14px 20px;border-bottom:1px solid #f0f0f0;gap:12px}.todo-item:last-child{border-bottom:none}.todo-item.completed .todo-text{text-decoration:line-through;color:#bbb}.todo-checkbox{width:20px;height:20px;cursor:pointer;accent-color:#d9534f;flex-shrink:0}.todo-text{flex:1;font-size:1rem;line-height:1.5;cursor:text;word-break:break-all}.todo-edit-input{flex:1;font-size:1rem;padding:2px 6px;border:1px solid #d9534f;border-radius:4px;outline:none}.btn-delete{color:#ccc;font-size:.875rem;padding:4px 8px;border-radius:4px;opacity:0;transition:opacity .15s,color .15s}.todo-item:hover .btn-delete{opacity:1}.btn-delete:hover{color:#d9534f}.todo-footer{display:flex;align-items:center;padding:10px 20px;border-top:1px solid #eee;gap:8px;font-size:.85rem;color:#888;flex-wrap:wrap}.todo-count{flex:1;min-width:fit-content}.filter-buttons{display:flex;gap:4px}.btn-filter{padding:4px 10px;border-radius:4px;color:#666;border:1px solid transparent}.btn-filter:hover{border-color:#ddd}.btn-filter.active{border-color:#d9534f;color:#d9534f}.btn-clear{color:#999;padding:4px 8px;border-radius:4px}.btn-clear:hover{color:#d9534f}.empty-message{text-align:center;padding:32px;color:#bbb;font-size:.95rem}