/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 500px;
  padding: 30px;
}

h1 {
  color: #333;
  margin-bottom: 25px;
  text-align: center;
  font-size: 28px;
}

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

#todoInput {
  flex: 1;
  padding: 12px 15px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s;
}

#todoInput:focus {
  outline: none;
  border-color: #667eea;
}

#addBtn {
  padding: 12px 25px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s;
}

#addBtn:hover {
  background: #5568d3;
}

#addBtn:active {
  transform: scale(0.98);
}

/* Todo list */
.todo-list {
  list-style: none;
  margin-bottom: 20px;
}

.todo-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px;
  background: #f8f9fa;
  border-radius: 8px;
  margin-bottom: 10px;
  transition: all 0.3s;
}

.todo-item:hover {
  background: #e9ecef;
  transform: translateX(5px);
}

.todo-text {
  flex: 1;
  color: #333;
  font-size: 16px;
}

.delete-btn {
  padding: 8px 16px;
  background: #dc3545;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.3s;
}

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

.delete-btn:active {
  transform: scale(0.95);
}

/* Footer */
.footer {
  text-align: center;
  color: #666;
  font-size: 14px;
  padding-top: 15px;
  border-top: 1px solid #e0e0e0;
}

/* Empty state */
.empty-state {
  text-align: center;
  color: #999;
  padding: 40px 20px;
  font-size: 16px;
}