styles.css

/* External CSS File */
.intro {
  background-color: #f0f0f0;
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid #ccc;
}

.intro h1 {
  color: #333;
  font-size: 1.5em;
}

footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 2px;
  position: fixed;
  bottom: 0;
  width: 100%;
}

/* Default theme variables */
:root {
  --background-color: #f0f0f0;
  --primary-color: #007bff;
  --primary-hover-color: #0056b3;
  --text-color: #333;
  --section-bg-color: white;
  --task-bg-color: #f9f9f9;
  --delete-button-color: #dc3545;
  --delete-button-hover-color: #c82333;
}

/* Dark theme variables */
[data-theme="dark"] {
  --background-color: #333;
  --primary-color: #555;
  --primary-hover-color: #777;
  --text-color: #f0f0f0;
  --section-bg-color: #444;
  --task-bg-color: #555;
  --delete-button-color: #aa0000;
  --delete-button-hover-color: #cc0000;
}

/* Blue theme variables */
[data-theme="blue"] {
  --background-color: #e0f7fa;
  --primary-color: #00796b;
  --primary-hover-color: #004d40;
  --text-color: #fffcfc;
  --section-bg-color: #b2ebf2;
  --task-bg-color: #80deea;
  --delete-button-color: #147e6c;
  --delete-button-hover-color: #296b66;
}

/* Purple theme variables */
[data-theme="purple"] {
  --background-color: #f9f4f9;
  --primary-color: #c88bd3;
  --primary-hover-color: #ba4be9;
  --text-color: #ffffff;
  --section-bg-color: #dcade4;
  --task-bg-color: #ba68c8;
  --delete-button-color: #7b1fa2;
  --delete-button-hover-color: #5a1b7d;
}

body {
  font-family: "Arial", sans-serif;
  background-color: var(--background-color);
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: background-color 0.3s;
}

.menu {
  background-color: var(--primary-color);
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 10px 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.menu button {
  background-color: var(--primary-color);
  color: var(--text-color);
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  margin: 0 10px;
  font-size: 16px;
  border-radius: 4px;
  transition: background-color 0.3s, transform 0.2s;
}

.menu button:hover {
  background-color: var(--primary-hover-color);
  transform: scale(1.05);
}

.section {
  background-color: var(--section-bg-color);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  width: 400px;
  margin-top: 20px;
  transition: all 0.3s;
}

h2 {
  color: var(--text-color);
  margin-bottom: 20px;
  text-align: center;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  color: var(--text-color);
}

.form-group input {
  width: calc(100% - 22px);
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  transition: border-color 0.3s;
}

.form-group input:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

button {
  width: 100%;
  padding: 10px;
  border: none;
  background-color: var(--primary-color);
  color: var(--text-color);
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 0.3s, transform 0.2s;
}

button:hover {
  background-color: var(--primary-hover-color);
  transform: scale(1.05);
}

#taskListContent,
#deletedTaskContent {
  margin-top: 20px;
}

.task {
  background-color: var(--task-bg-color);
  padding: 10px;
  border-radius: 4px;
  margin-bottom: 10px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s;
}

.task:hover {
  transform: scale(1.02);
}

.task button {
  background-color: var(--delete-button-color);
  margin-top: 10px;
}

.task button:hover {
  background-color: var(--delete-button-hover-color);
}

.theme-switcher {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--section-bg-color);
  padding: 12px 20px;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  margin-top: 20px;
  position: relative;
}

.theme-switcher h2 {
  font-size: 15px;
  font-weight: bold;
  color: var(--text-color);
  margin: 0;
}

.theme-switcher select {
  appearance: none;
  padding: 12px;
  border: 1px solid var(--primary-color);
  border-radius: 8px;
  background-color: var(--background-color);
  color: var(--text-color);
  font-size: 14px;
  transition: border-color 0.3s, box-shadow 0.3s;
  width: 150px;
  cursor: pointer;
  position: relative;
  z-index: 1;
}

.theme-switcher select:focus {
  outline: none;
  border-color: var(--primary-hover-color);
  box-shadow: 0 0 8px rgba(0, 123, 255, 0.6);
}

.theme-switcher select::after {
  content: "\25BC";
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-color);
  font-size: 14px;
  z-index: 0;
}