*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,sans-serif;background-color:#f2f4f8;margin:0;padding:0}.app-container{display:flex;gap:40px;max-width:1000px;width:100%;padding:40px;background:#fff;border-radius:16px;box-shadow:0 4px 12px #00000014}.user-switcher{min-width:220px}.user-switcher h3{margin-bottom:16px;font-size:30px;color:#444;text-align:center}.user-switcher ul{list-style:none;padding:0}.user-switcher li{margin-bottom:12px}.user-switcher button{width:100%;padding:14px;font-size:16px;background-color:#e0e0e0;border:none;border-radius:10px;cursor:pointer;transition:all .3s ease}.user-switcher button:hover{background-color:#d5d5d5}.user-switcher button.active{background-color:#4caf50;color:#fff}.task-form{display:flex;gap:12px;margin-bottom:24px}.task-form input{flex:1;padding:12px;font-size:16px;border:1px solid #ccc;border-radius:8px}.task-form button{padding:12px 20px;font-size:16px;background-color:#007bff;color:#fff;border:none;border-radius:8px;cursor:pointer;transition:background .3s ease}.task-form button:hover{background-color:#0056b3}.task-list{list-style:none;padding:0;margin:0}.task-item{background-color:#f9f9f9;padding:14px 18px;margin-bottom:14px;border-radius:10px;box-shadow:0 1px 4px #0000000d;display:flex;align-items:center;gap:14px}.task-item input[type=checkbox]{cursor:pointer;transform:scale(1.3)}.task-item span{flex:1;font-size:17px}.task-item span.completed{text-decoration:line-through;color:#888}.task-item button{background:transparent;border:none;font-size:20px;cursor:pointer;color:#e74c3c;transition:transform .2s ease}.task-item button:hover{transform:scale(1.3)}