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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f3f4f6;
  display: flex;
  justify-content: center;
  padding: 48px 16px;
  color: #1f2937;
}

.container {
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 32px;
  width: 100%;
  max-width: 480px;
}

h1 {
  font-size: 24px;
  margin-bottom: 4px;
}

.subtitle {
  color: #6b7280;
  font-size: 13px;
  margin-bottom: 24px;
}

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

#task-input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 14px;
}

#task-input:focus {
  outline: none;
  border-color: #2563eb;
}

button {
  padding: 10px 16px;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

#task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#task-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
}

#task-list li span {
  flex: 1;
  font-size: 14px;
  word-break: break-word;
}

#task-list li.done span {
  text-decoration: line-through;
  color: #9ca3af;
}

.delete-btn {
  background: #ef4444;
  padding: 6px 10px;
  font-size: 12px;
}

.delete-btn:hover {
  background: #dc2626;
}

.empty-state {
  text-align: center;
  color: #9ca3af;
  font-size: 13px;
  padding: 16px 0;
}