:root{--bg:#f5f6fa;--card:#fff;--text:#1f2430;--text-muted:#6b7280;--primary:#2f5fd6;--primary-hover:#274ec2;--border:#e2e5eb;--danger:#d64545;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}.app{max-width:560px;margin:0 auto;padding:48px 20px}header{text-align:center;margin-bottom:24px}header h1{margin:0 0 4px;font-size:28px}.subtitle{color:var(--text-muted);margin:0;font-size:14px}.task-form{flex-wrap:wrap;gap:8px;margin-bottom:24px;display:flex}.task-form input{border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:8px;flex:160px;padding:10px 12px;font-size:14px}.task-form button{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:10px 18px;font-size:14px;transition:background .15s}.task-form button:hover:not(:disabled){background:var(--primary-hover)}.task-form button:disabled{opacity:.6;cursor:not-allowed}.task-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.task-list li{background:var(--card);border:1px solid var(--border);border-radius:10px;justify-content:space-between;align-items:center;padding:12px 14px;display:flex}.task-list li.completed .task-title{color:var(--text-muted);text-decoration:line-through}.task-list label{cursor:pointer;flex:1;align-items:flex-start;gap:10px;display:flex}.task-list input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary);margin-top:3px}.task-text{flex-direction:column;display:flex}.task-title{font-size:15px}.task-description{color:var(--text-muted);margin-top:2px;font-size:13px}.delete-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:6px;padding:4px 8px;font-size:14px}.delete-btn:hover{color:var(--danger);background:#fbe9e9}.empty-state{text-align:center;color:var(--text-muted);margin-top:32px;font-size:14px}.error-banner{color:var(--danger);text-align:center;background:#fdecec;border:1px solid #f5c2c2;border-radius:8px;padding:10px 12px;font-size:14px}