:root {
  --primary-color: #90caf9;
  --secondary-color: #f92f60;
  --text-color: #f5f5f5;
  --border-color: #444a57;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  --background-color: #181a20;
  --secondary-background-color: #393939;

  --task-completed-color: #5bfb76;
}

* {
  margin: 0;
  padding: 0;
  font-size: 1.1rem;
  box-sizing: border-box;
  font-family: "Arial", sans-serif;
}

body {
  background-color: var(--secondary-background-color);
  color: var(--text-color);
  line-height: 1.6;
  padding: 20px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--background-color);
  padding: 2rem;
  border-radius: 10px;
  box-shadow: var(--shadow);
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  color: var(--primary-color);
  font-size: 2.5rem;
}

.input-section {
  display: flex;
  gap: 10px;
  margin-bottom: 1.5rem;
}

input[type="text"] {
  flex: 1;
  padding: 12px;
  border: 2px solid var(--border-color);
  border-radius: 5px;
  font-size: 1rem;
  transition: border-color 0.3s;
  background-color: var(--secondary-background-color);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--primary-color);
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

.filters button:hover {
  background-color: var(--secondary-color);
}

.filters {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 1.5rem 0;
}

.filter-btn {
  background: none;
  color: var(--text-color);
  border: 1px solid var(--secondary-color);
  padding: 5px 15px;
}

.filter-btn.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

#taskList {
  list-style: none;
  margin-bottom: 1.5rem;
}

.task-item {
  display: flex;
  align-items: center;
  padding: 12px;
  background: var(--secondary-background-color);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  margin-bottom: 10px;
  transition: all 0.3s ease;
}

.task-item:hover {
  transform: translateX(7px);
}

.task-item.completed {
  /* text-decoration: line-through; */
  background-color: var(--task-completed-color);
  color: #000000;
}

.task-checkbox {
  margin-right: 10px;
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.task-text {
  flex: 1;
}

.delete-btn {
  border: none;
  width: 25px;
  height: 25px;
  border: 3px solid var(--secondary-color);
  padding: 10px;
  background-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.3s;
}

.task-item:hover .delete-btn {
  opacity: 1;
}

.task-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-color);
}

#clearCompleted {
  background: none;
  color: var(--text-color);
  padding: 5px 10px;
  border: 1px solid var(--border-color);
}

#clearCompleted:hover {
  background-color: var(--primary-color);
  color: var(--text-color);
}

@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .input-section {
    flex-direction: column;
  }

  button {
    padding: 10px;
  }
}