body {
    font-family: Arial, sans-serif;
    background: #f0f4f8;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    height: 100vh;
    padding-top: 60px;
    margin: 0;
}

.app {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 900px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.todo-form {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

input[type="text"] {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    padding: 10px;
    background-color: #0077cc;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #005fa3;
}

.task-columns {
    display: flex;
    gap: 20px;
    justify-content: space-between;
}

.column {
    flex: 1;
}

.column h2 {
    margin-bottom: 10px;
    border-bottom: 1px solid #ccc;
    padding-bottom: 5px;
}

.task-list {
    list-style: none;
    padding-left: 0;
    margin-top: 25px;
}

.task-list li {
    background: #f9f9f9;
    padding: 12px 10px;
    border-radius: 5px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}

.task-list li.done span {
    text-decoration: line-through;
    color: #888;
}

.task-buttons {
    display: flex;
    gap: 8px;
}

.task-buttons button {
    padding: 5px 8px;
    font-size: 14px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.task-buttons .dont-btn {
    background-color: #2ecc71;
    color: white;
}

.task-buttons .delete-btn {
    background-color: #e74c3c;
    color: white;
}

.done-task {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.done-task span:first-child {
    font-weight: bold;
}

.done-date {
    font-size: 0.8em;
    color: #777;
    margin-top: 5px;
}

u1 {
    list-style: none;
    padding: 0;
}

li {
    background: #f9f9f9;
    padding: 12px 10px;
    border-radius: 5px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

li.done span {
    text-decoration: line-through;
    color: #888;
}

.delete-btn {
    background: none;
    color: red;
    border: none;
    cursor: pointer;
    font-size: 16px;
}