/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body, html {
  height: 100%;
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background: linear-gradient(to right, #e3f2fd, #fce4ec);
  color: #333;
  transition: all 0.3s ease-in-out;
}

/* Navbar */
nav {
  height: 60px;
  background-color: #4CAF50;
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

/* Layout */
.main-container {
  display: flex;
  height: calc(100% - 60px);
  padding: 20px;
}

/* Sidebars */
#left-sidebar,
#right-sidebar {
  width: 300px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
  overflow-y: auto;
}

#left-sidebar {
  border-right: 1px solid #ccc;
}

#right-sidebar {
  border-left: 1px solid #ccc;
}

/* Sidebar Task Cards */
.sidebar-task {
  background: white;
  padding: 15px;
  margin-bottom: 15px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: transform 0.2s ease, background-color 0.3s ease;
}

.sidebar-task:hover {
  background-color: #f9f9f9;
  transform: translateY(-5px);
}

.task-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}

.task-buttons button {
  padding: 6px 10px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: 0.3s ease;
}

.task-buttons .complete {
  background: #4caf50;
  color: white;
}

.task-buttons .update {
  background: #ffc107;
  color: black;
}

.task-buttons .delete {
  background: #f44336;
  color: white;
}

.task-buttons button:hover {
  transform: scale(1.05);
}

/* Completed Task Cards */
.completed-task {
  background: #d4edda;
  padding: 15px;
  margin-bottom: 15px;
  border-radius: 12px;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

.completed-task:hover {
  background-color: #c8e6c9;
  transform: scale(1.02);
}

/* To-Do Form */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.todo-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 25px;
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 8px #00000015;
  width: 650px;
  height: 400px;
}

.todo-form input,
.todo-form textarea,
.todo-form select {
  padding: 10px;
  font-size: 15px;
  border-radius: 6px;
  border: 1px solid #ccc;
}

.todo-form button {
  padding: 12px;
  font-size: 16px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

/* DateTime */
.datetime-wrapper {
  display: flex;
  gap: 10px;
}

/* Dark Mode */
body.dark-mode {
  background: #121212;
  color: white;
}

body.dark-mode .todo-form,
body.dark-mode #left-sidebar,
body.dark-mode #right-sidebar {
  background-color: #1e1e1e;
  color: white;
}

body.dark-mode .sidebar-task {
  background-color: #2c2c2c;
}

body.dark-mode .completed-task {
  background-color: #2e7d32;
  color: white;
}