.todo-container {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #fff;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  max-width: 400px;
  margin: 0 auto;
}
.todo-container h2 {
  margin: 0 0 20px 0;
  color: #1f2937;
}
.input-row {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}
.input-row input {
  flex: 1;
  padding: 10px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  outline: none;
}
.input-row input:focus {
  border-color: #3b82f6;
}
.input-row button {
  background: #3b82f6;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}
#taskList {
  list-style: none;
  padding: 0;
  margin: 0;
}
#taskList li {
  background: #f9fafb;
  border-bottom: 1px solid #e5e7eb;
  padding: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: background 0.2s;
  border-radius: 6px;
  margin-bottom: 5px;
}
#taskList li.checked {
  text-decoration: line-through;
  color: #9ca3af;
  background: #f0fdf4;
}
.close {
  padding: 4px 8px;
  color: #ef4444;
  font-weight: bold;
  border-radius: 4px;
}
.close:hover {
  background: #fee2e2;
}

function addTask() {
  const inputValue = document.getElementById("taskInput").value;
  if (inputValue === "") return;

  const li = document.createElement("li");
  const t = document.createTextNode(inputValue);
  li.appendChild(t);
  
  // Toggle complete
  li.addEventListener("click", function() {
    this.classList.toggle("checked");
  });

  // Delete button
  const span = document.createElement("span");
  const txt = document.createTextNode("\u00D7");
  span.className = "close";
  span.appendChild(txt);
  span.onclick = function(e) {
    e.stopPropagation();
    const div = this.parentElement;
    div.style.display = "none";
  };
  
  li.appendChild(span);
  document.getElementById("taskList").appendChild(li);
  document.getElementById("taskInput").value = "";
}