/* General Body and Font Styles */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  background-color: #f4f7f9;
  color: #333;
  margin: 0;
  padding: 20px;
}

/* Main Container */
.container {
  max-width: 900px;
  margin: 20px auto;
  background: #ffffff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Header Styles */
h1, h2, h3 {
  color: #2c3e50;
  border-bottom: 2px solid #e0e0e0;
  padding-bottom: 10px;
}
h1 {
  text-align: center;
  font-size: 2.2em;
}

/* Mode Selection Buttons */
.mode-selection {
  text-align: center;
  margin-bottom: 30px;
}
.mode-btn {
  padding: 12px 25px;
  margin: 0 10px;
  font-size: 18px;
  cursor: pointer;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 5px;
  transition: background-color 0.3s, transform 0.2s;
}
.mode-btn:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
}

/* Practice & Study Area Shared Styles */
.practice-area, .study-area {
  margin-top: 20px;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 8px;
  background: #fdfdfd;
}

/* Practice Mode Specific Styles */
.question-text {
  font-size: 1.5em;
  font-weight: bold;
  color: #00008B; /* Dark Blue */
  text-align: center;
  margin-bottom: 25px;
}
.factor-input-group {
  margin-bottom: 15px;
}
.factor-input-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
  color: #555;
}
.factor-input {
  width: 100%;
  padding: 10px;
  font-size: 1.1em;
  border: 2px solid #ccc;
  border-radius: 5px;
  box-sizing: border-box;
}
.action-buttons {
  text-align: center;
  margin-top: 20px;
}
.action-buttons button {
   padding: 10px 20px;
   font-size: 16px;
   margin: 5px;
   cursor: pointer;
   border-radius: 5px;
   border: none;
   color: white;
}
#submit-btn { background-color: #27ae60; }
#submit-btn:hover { background-color: #229954; }
#next-btn { background-color: #f39c12; }
#next-btn:hover { background-color: #d68910; }

/* Feedback and Solution Boxes */
.feedback, .solution-box {
  margin-top: 20px;
  padding: 15px;
  border-radius: 5px;
  font-size: 1.1em;
}
.feedback.correct {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}
.feedback.incorrect {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}
.solution-box {
  background-color: #e0f0ff;
  border: 1px dashed #007bff;
}
.solution-box strong {
  color: #0056b3;
}

/* Study Mode Specific Styles */
.method-card {
  background: #f9f9f9;
  border-left: 5px solid #3498db;
  padding: 15px 20px;
  margin-bottom: 20px;
  border-radius: 5px;
}
.method-card h3 {
  margin-top: 0;
  border-bottom: none;
}
.method-card code {
  background-color: #e9ecef;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Courier New", Courier, monospace;
}
.method-card ul {
    padding-left: 20px;
}

/* Utility Class */
.hidden {
  display: none;
}