/* Variables for colors and common properties */
:root {
    --banner-bg-start: #444;
    --banner-bg-end: #222;
    --white: #fff;
    --text-dark: #333;
    --header-bg-start: #1a2a3d;
    --header-bg-end: #4a6785;
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --btn-bg: #3498db;
    --btn-bg-hover: #2980b9;
    --btn-alt-bg: #4CAF50;
    --btn-alt-hover: #45a049;
  }
  
  /* Reset & Global Styles */
  *,
  *::before,
  *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: Arial, sans-serif;
    color: var(--text-dark);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: url('../img/bg.jpg') center repeat;
    position: relative;
  }
  
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-color: rgba(255, 255, 255, 0.5);
    z-index: -1;
  }
  
  /* Core Layout */
  header, main, footer {
    position: relative;
    z-index: 1;
  }
  
  /* Scrolling Banner */
  .scrolling-banner {
    background: linear-gradient(to right, var(--banner-bg-start), var(--banner-bg-end));
    color: var(--white);
    font-weight: bold;
    padding: 10px 0;
    text-align: center;
    font-size: 16px;
    overflow: hidden;
    white-space: nowrap;
    width: 100%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    margin-top: 0;
    position: relative;
    z-index: 999;
  }
  
  .scrolling-banner p {
    display: inline-block;
    margin: 0;
    animation: scroll-left 50s linear infinite;
  }
  
  @keyframes scroll-left {
    0% {
      transform: translateX(100%);
    }
    100% {
      transform: translateX(-100%);
    }
  }
  
  /* Header */
  header {
    background: linear-gradient(135deg, var(--header-bg-start) 0%, var(--header-bg-end) 100%);
    color: var(--white);
    padding: 20px 40px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  }
  
  header h1 {
    font-size: 24px;
    line-height: 1.2;
  }
  
  /* Title & Subtitle */
  .cet-title {
    font-family: "Courier New", Courier, monospace;
    font-weight: 700;
    font-size: 36px;
    color: #ecf0f1;
    letter-spacing: 2px;
    text-transform: uppercase;
  }
  
  .page-subtitle {
    font-size: 20px;
    color: #bdc3c7;
    font-weight: 400;
  }
  
  /* Navigation */
  nav {
    margin-top: 15px;
  }
  
  nav a {
    color: var(--white);
    text-decoration: none;
    padding: 10px 20px;
    margin: 0 10px;
    border-radius: 5px;
    font-size: 16px;
    transition: background-color 0.3s, transform 0.2s;
  }
  
  nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
  }
  
  /* Main Content */
  main {
    flex: 1;
    padding: 20px;
    text-align: center;
    max-width: 80%;
    margin: 0 auto;
  }
  
  /* Footer */
  footer {
    background-color: #2c3e50;
    color: var(--white);
    text-align: center;
    padding: 15px;
    flex-shrink: 0;
  }
  
  /* Dropdown Menus */
  #course-menu, #category-menu {
    text-align: center;
    margin-bottom: 15px;
  }

  
  
  #course-menu select, #category-menu select {
    padding: 10px;
    font-size: 16px;
    border-radius: 5px;
    background-color: #fff;
    border: 1px solid #ccc;
    cursor: pointer;
  }
  
  /* Category List */
  .category-list {
    list-style: none;
    padding: 0;
  }
  
  .category-item {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 10px 20px;
    margin: 10px 0;
    text-align: center;
  }
  
  .category-item a {
    display: block;
    text-decoration: none;
    color: var(--text-dark);
  }
  
  .category-item a:hover {
    text-decoration: none;
    background-color: transparent;
  }
  
  /* Flashcards */
  .flashcards-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    padding: 20px;
  }
  
  .flashcard {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    width: 90%;
    max-width: 400px;
    min-height: 200px;
    text-align: center;
    transition: transform 0.2s;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
  
  .flashcard:hover {
    transform: scale(1.05);
  }
  
  .flashcard .question {
    font-size: 20px;
    font-weight: bold;
  }
  
  .flashcard .answer {
    font-size: 18px;
    color: #16a085;
    margin-top: 10px;
    display: none;
  }
  
  /* Options in Flashcard and Quiz */
  .flashcard .options,
  .flashcard .answer,
  .options ul {
    margin-top: 15px;
    text-align: center;
    width: 100%;
    list-style: none;
    padding: 0;
  }
  
  .flashcard .options li,
  .flashcard .answer li {
    background-color: #ecf0f1;
    padding: 10px;
    margin: 5px 0;
    border-radius: 4px;
  }
  
  /* Quiz Styles */
  .quiz-question {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    max-width: 100%;
    margin: 0 auto 20px;
  }
  
  .quiz-question p {
    font-size: 18px;
    margin-bottom: 15px;
  }
  
  .options label {
    display: block;
    margin: 5px 0;
  }
  
  .options input[type="radio"] {
    margin-right: 10px;
  }
  
  #text-answer {
    width: 100%;
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
  }
  
  /* Navigation & Progress */
  .navigation, #quiz-navigation {
    text-align: center;
    margin-top: 20px;
  }
  
  .navigation button,
  #quiz-navigation button {
    padding: 10px 20px;
    font-size: 16px;
    margin: 0 10px;
    background-color: var(--btn-bg);
    color: var(--white);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
  }
  
  .navigation button:hover,
  #quiz-navigation button:hover:not(:disabled) {
    background-color: var(--btn-bg-hover);
  }
  
  #quiz-navigation button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
  }
  
  .progress,
  #quiz-result {
    text-align: center;
    margin-top: 20px;
    font-size: 18px;
  }
  
  #quiz-result p {
    color: #16a085;
  }
  
  .hidden {
    display: none;
  }
  
  /* Snippet Styles */
  .snippet-box {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin: 20px 0;
    text-align: left;
  }
  
  .snippet-box h3,
  .snippet-box h4 {
    margin-bottom: 10px;
    font-size: 18px;
    color: #2c3e50;
  }
  
  .snippet-box pre {
    background-color: #f4f4f4;
    padding: 10px;
    border-radius: 4px;
    white-space: pre-wrap;
    word-wrap: break-word;
  }
  
  .snippet-box code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
  }
  
  /* Flashcard Form */
  .flashcard-form {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 25px;
    max-width: 400px;
    min-width: 300px;
    margin: 40px auto;
    text-align: left;
  }
  
  .flashcard-form h2 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 20px;
    font-size: 22px;
  }
  
  .flashcard-form label {
    font-weight: bold;
    color: var(--text-dark);
    margin: 10px 0 5px;
    display: block;
  }
  
  .flashcard-form input,
  .flashcard-form select,
  .flashcard-form textarea {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  .flashcard-form textarea {
    min-height: 100px;
    resize: vertical;
  }
  
  .flashcard-form button {
    background-color: var(--btn-bg);
    color: var(--white);
    padding: 12px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    width: 100%;
    margin-top: 15px;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out;
  }
  
  .flashcard-form button:hover {
    background-color: var(--btn-bg-hover);
  }
  
  /* Messages */
  .success-message,
  .error-message {
    color: var(--white);
    padding: 10px;
    text-align: center;
    border-radius: 5px;
    margin-top: 15px;
  }
  
  .success-message {
    background-color: var(--success-color);
  }
  
  .error-message {
    background-color: var(--error-color);
  }
  
  /* Bulk Add Form */
  .bulk-add-form {
    max-width: 1000px;
    margin: 0 auto;
  }
  
  .form-field {
    margin-bottom: 10px;
  }
  
  .inline-form-field {
    display: inline-block;
    margin-right: 15px;
    width: 16%;
  }
  
  .inline-form-field label {
    display: block;
    font-weight: bold;
    margin-bottom: 3px;
    font-size: 0.9em;
  }
  
  .inline-form-field input,
  .inline-form-field select,
  .inline-form-field textarea {
    width: 100%;
    padding: 6px;
    margin-top: 3px;
    font-size: 0.9em;
  }
  
  .bulk-entry-row {
    margin-bottom: 15px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
  }
  
  button.add-option-btn {
    margin-top: 10px;
    font-size: 1em;
  }
  
  textarea {
    height: 80px;
    font-size: 0.9em;
  }
  
  /* Generic Button */
  button {
    margin-top: 15px;
    padding: 8px 12px;
    background-color: var(--btn-alt-bg);
    color: var(--white);
    border: none;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s;
  }
  
  button:hover {
    background-color: var(--btn-alt-hover);
  }
  
  /* Options Container */
  .options-container {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
  }
  
  .options-container input {
    flex: 1;
    max-width: 200px;
  }
  
  /* Responsive Adjustments */
  @media (max-width: 600px) {
    main, .flashcard-form {
      width: 90%;
      max-width: 100%;
    }
    .flashcard {
      max-width: 350px;
    }
  }
  
  @media (min-width: 1200px) {
    .flashcard {
      max-width: 450px;
    }
    .flashcard-form {
      max-width: 450px;
    }
  }
  

  .toggle-header::after {
    content: " ▼";
    font-size: 0.8em;
}