:root {
  --color-primary: #2b2b7a;
  --color-bg: #f4f4f8;
  --color-card: #ffffff;
  --color-text: #333333;
  --color-done: #999999;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
}

.container {
  max-width: 480px;
  margin: 40px auto;
  background-color: var(--color-card);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

header {
  background-color: var(--color-primary);
  color: white;
  text-align: center;
  padding: 28px 20px;
}

header h1 {
  margin: 0 0 6px;
}

.subtitle {
  margin: 0;
  opacity: 0.85;
  font-size: 14px;
}

main {
  padding: 24px;
}

#taskForm {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

#taskInput {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  font-size: 15px;
  border: 1px solid #ccc;
  border-radius: 6px;
}

button {
  padding: 10px 16px;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
}

button.secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  font-weight: normal;
  font-size: 13px;
  padding: 6px 12px;
}

#taskList {
  list-style: none;
  margin: 0;
  padding: 0;
}

#taskList li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background-color: var(--color-bg);
  border-radius: 6px;
  margin-bottom: 8px;
}

#taskList li span {
  cursor: pointer;
  flex: 1;
  word-break: break-word;
}

#taskList li.done span {
  text-decoration: line-through;
  color: var(--color-done);
}

#taskList li button {
  background-color: #c0392b;
  padding: 6px 10px;
  font-size: 12px;
  margin-left: 10px;
  flex-shrink: 0;
}

.summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: #777;
  margin-top: 16px;
}

.empty-message {
  text-align: center;
  color: #999;
  padding: 20px 0;
  font-style: italic;
  justify-content: center;
}

footer {
  text-align: center;
  padding: 16px;
  font-size: 13px;
  color: #777;
  border-top: 1px solid var(--color-bg);
}

footer a {
  color: var(--color-primary);
}