*{
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    background-color: #f4f6f8;
    display: flex;
    justify-content: center;
    padding-top: 50px;
}

.app{
    background:#fff;
    padding: 20px;
    width: 100%;
    max-width: 450px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);

    display: flex;
    flex-direction: column;
    gap: 20px;
}

h1 {
    text-align: center;
}

.input-section {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 10px;
}

button {
  padding: 10px 14px;
  border: none;
  border-radius: 6px;
  background: #f0f2f5;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}
button:hover {
  background: #e2e6ea;
}

button:active {
  transform: scale(0.97);
}

#addTaskBtn {
  background: #007bff;
  color: white;
}

#addTaskBtn:hover {
  background: #0069d9;
}

.filters {
    display: flex;
  gap: 10px;
}

.filters button {
    flex: 1;
    background-color: #f1f3f5;
}

.filters button.active {
    background-color: #007bff;
    color: white;
}

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

li {
  background: #f9fafb;
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;

  display: flex;
  justify-content: space-between;
  align-items: center;

  transition: background 0.2s ease;
}

li:hover {
  background: #f1f3f5;
}

li span {
  font-size: 15px;
  color: #333;
  max-width: 70%;
  word-break: break-word;
}

li.completed {
  background: #eef1f4;
}

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

li div {
  display: flex;
  gap: 8px;
}

li div button {
  font-size: 12px;
  padding: 6px 10px;
}

@media (max-width: 400px) {
   .input-section {
    flex-direction: column;
   }
}