.app{max-width:600px;margin:40px auto;background:#fff;border-radius:12px;box-shadow:0 4px 20px #0000001a;overflow:hidden}.app-header{background:#1f5c99;color:#fff;padding:24px;display:flex;justify-content:space-between;align-items:center}.app-header h1{font-size:1.5rem}.badge{background:#e74c3c;color:#fff;border-radius:20px;padding:4px 12px;font-size:.85rem;font-weight:700}main{padding:24px}.add-task{display:flex;gap:12px;margin-bottom:24px}.add-task input{flex:1;padding:10px 14px;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;outline:none}.add-task input:focus{border-color:#1f5c99}.add-task button{padding:10px 20px;background:#1f5c99;color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:1rem}.task-list{list-style:none;display:flex;flex-direction:column;gap:10px}.task-list li{display:flex;align-items:center;gap:12px;padding:12px 16px;background:#f8f9fa;border-radius:8px}.task-list li.done span{text-decoration:line-through;color:#aaa}.task-list li span{flex:1}.task-list li button{background:none;border:none;color:#e74c3c;cursor:pointer;font-size:1rem}.empty{text-align:center;color:#aaa;padding:40px}footer{padding:12px 24px;background:#f8f9fa;border-top:1px solid #eee}footer small{color:#aaa;font-size:.75rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Arial,sans-serif;background:#f0f4f8;color:#1a1a2e}