/* Mobile-first responsive design */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #007bff;
    color: white;
    padding: 1rem;
    text-align: center;
}

header h1 {
    margin: 0;
}

header p {
    margin: 0.5rem 0 0;
}

header a {
    color: white;
    text-decoration: underline;
}

main {
    flex: 1;
    padding: 1rem;
}

.todo-container {
    max-width: 600px;
    margin: 0 auto;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    padding: 1rem;
}

.add-todo {
    display: flex;
    margin-bottom: 1rem;
}

.add-todo input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
}

.add-todo button {
    padding: 0.5rem 1rem;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

.add-todo button:hover {
    background-color: #218838;
}

#todo-list {
    list-style: none;
    padding: 0;
}

.todo-item {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    border-bottom: 1px solid #ddd;
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: #888;
}

.todo-text {
    flex: 1;
    margin-left: 0.5rem;
}

.edit-input {
    flex: 1;
    margin-left: 0.5rem;
    padding: 0.25rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.todo-actions {
    display: flex;
    gap: 0.5rem;
}

.btn {
    padding: 0.25rem 0.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-edit {
    background-color: #ffc107;
    color: white;
}

.btn-edit:hover {
    background-color: #e0a800;
}

.btn-delete {
    background-color: #dc3545;
    color: white;
}

.btn-delete:hover {
    background-color: #c82333;
}

.btn-save {
    background-color: #17a2b8;
    color: white;
}

.btn-save:hover {
    background-color: #138496;
}

footer {
    background-color: #007bff;
    color: white;
    text-align: center;
    padding: 1rem;
}

/* Tablet and larger screens */
@media (min-width: 768px) {
    .todo-item {
        padding: 1rem;
    }

    .add-todo input {
        font-size: 1rem;
    }

    .add-todo button {
        font-size: 1rem;
    }
}