#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1050;
  pointer-events: none;
}

/* General Body Styles */
body {
  min-height: 100vh;
  font-size: 1.2rem; /* Larger base font size */
}

body {
  max-width: 480px;
  margin: 0 auto;
}

/* Header Navigation Tabs */
.nav-btn {
  text-decoration: none;
  color: #6c757d; /* Muted gray for inactive tabs */
  transition: color 0.3s ease, transform 0.3s ease;
}

.nav-btn:hover {
  transform: scale(1.1);
}

.nav-btn[data-tab="home"].active {
  color: #0d6efd; /* Blue for Home */
}
.nav-btn[data-tab="levels"].active {
  color: #198754; /* Green for Levels */
}
.nav-btn[data-tab="settings"].active {
  color: #fd7e14; /* Orange for Settings */
}

.nav-btn.active {
  font-weight: bold;
}

/* Question & Answer Card */
.question-container .card {
  border-radius: 20px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  border: none;
}

/* Container for the answer input and button */
.answer-form-container {
  max-width: 250px;
}

/* Style for the submit button */
#submit-answer {
  border-radius: 15px; /* Rounded corners */
  background-color: #28a745; /* Cheerful green */
  border: none;
  font-weight: bold;
}

#submit-answer:hover {
  background-color: #218838; /* Darker green on hover */
}

/* Multi-line question format */
.question-multiline {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  font-family: "Courier New", Courier, monospace;
  padding-right: 20%;
}

.question-multiline .operand {
  display: block;
}

.question-multiline .operator-line {
  display: flex;
  align-items: center;
  width: 100%;
}

.question-multiline .operator {
  margin-right: 10px;
}

.question-multiline .bottom-operand {
  border-bottom: 2px solid #000;
  width: 100%;
  text-align: right;
}

/* Levels Tab */
.list-group-item {
  cursor: pointer;
  border-radius: 10px !important; /* Rounded corners for level items */
  margin-bottom: 5px;
  font-weight: 500;
}

.list-group-item:hover {
  background-color: #e9ecef;
}

.level-item {
  border-radius: 12px !important;
  transition: transform 0.2s ease-in-out;
}

.level-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.level-icon-container {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  font-size: 1.5rem;
}

.list-group-item.active {
  background-color: #0d6efd;
  border-color: #0d6efd;
}

/* General Feedback Text */
#feedback {
  min-height: 30px;
  font-weight: bold;
}

.danger-zone {
  border: 2px solid #dc3545;
  border-radius: 10px;
  padding: 15px;
  background-color: #f8d7da;
}