* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 40px 20px;
}

.container {
  background: white;
  border-radius: 16px;
  padding: 40px;
  max-width: 500px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
  font-size: 24px;
  color: #333;
  margin-bottom: 8px;
}

.subtitle {
  color: #888;
  margin-bottom: 24px;
  font-size: 14px;
}

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

#todo-list li {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  margin-bottom: 8px;
  border-radius: 8px;
  transition: background 0.2s;
}

#todo-list li:hover {
  background: #f5f5f5;
}

#todo-list li.completed {
  background: #e8f5e9;
}

#todo-list li.completed label {
  text-decoration: line-through;
  color: #999;
}

input[type="checkbox"] {
  width: 20px;
  height: 20px;
  margin-right: 12px;
  cursor: pointer;
  accent-color: #667eea;
}

label {
  font-size: 16px;
  color: #444;
  cursor: pointer;
  user-select: none;
}

.progress {
  margin-top: 24px;
  text-align: center;
}

#progress-text {
  font-size: 14px;
  color: #666;
  display: block;
  margin-bottom: 8px;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
}

#progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #667eea, #764ba2);
  transition: width 0.3s ease;
  border-radius: 4px;
}