:root {
    --spotify-green: #1DB954;
    --spotify-black: #191414;
    --light-gray: #f8f8f8;
    --medium-gray: #e0e0e0;
    --dark-gray: #333;
  }
  
  /* Reset and base styles */
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--light-gray);
  }
  
  a {
    color: var(--spotify-green);
    text-decoration: none;
  }
  a:hover {
    text-decoration: underline;
  }
  
  /* Container */
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
  }
  
  /* Header & Navigation */
  header {
    text-align: center;
    padding: 2rem 1rem;
    margin-bottom: 2rem;
    background-color: var(--spotify-black);
    color: white;
    border-radius: 8px;
  }
  header h1 {
    color: var(--spotify-green);
    margin-bottom: 0.5rem;
  }
  nav {
    margin-top: 1rem;
  }
  .nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s;
  }
  .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.2);
  }
  .nav-link.active {
    background-color: rgba(255, 255, 255, 0.3);
    font-weight: bold;
  }

  #logout-button {
    margin-left: auto;
  }
  
  /* Card */
  .card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin-bottom: 2rem;
  }
  
  /* Headings */
  h2 {
    color: var(--spotify-black);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--spotify-green);
    padding-bottom: 0.5rem;
  }
  
  /* Features section */
  .features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }
  .feature {
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
  }
  .feature h3 {
    color: var(--spotify-green);
    margin-bottom: 0.5rem;
  }
  
  /* CTA container */
  .cta-container {
    text-align: center;
    margin: 2rem 0 1rem;
  }
  
  /* Steps list */
  .steps {
    padding-left: 1.5rem;
    margin: 1.5rem 0;
  }
  .steps li {
    margin-bottom: 1rem;
  }
  
  /* Spotify login button */
  .spotify-login-button {
    display: inline-flex;
    align-items: center;
    background-color: var(--spotify-green);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
  }
  .spotify-login-button:hover {
    background-color: #18a449;
  }
  .spotify-logo {
    height: 24px;
    margin-right: 8px;
  }
  
  /* File upload */
  .file-input-container {
    margin: 1.5rem 0;
  }
  .file-input-label {
    display: inline-block;
    background-color: var(--spotify-green);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  .file-input-label:hover {
    background-color: #18a449;
  }
  input[type="file"] {
    display: none;
  }
  #file-names {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: #666;
  }
  
  /* Buttons */
  .button {
    background-color: var(--spotify-green);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
  }
  .button:hover {
    background-color: #18a449;
  }
  .button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
  }
  .button-secondary {
    background-color: #e0e0e0;
    color: #333;
  }
  .button-secondary:hover {
    background-color: #d0d0d0;
  }
  
  /* Loader */
  .hidden {
    display: none;
  }
  .loader {
    border: 4px solid var(--medium-gray);
    border-top: 4px solid var(--spotify-green);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
  }
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  
  /* Filters */
  .filters {
    background-color: var(--light-gray);
    padding: 1rem;
    border-radius: 4px;
    margin: 1rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
  }
  .filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
  }
  .filter-group label {
    font-size: 0.9rem;
    color: #666;
  }
  .filter-group input {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.9rem;
  }
  
  /* Pagination */
  .pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px; /* Adjust this value for more or less space */
  }
  
  .pagination-button {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
  #page-info {
    margin: 0 1rem;
    color: #666;
  }
  
  /* Stats grid */
  .stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
  }
  .stat-card {
    background-color: var(--light-gray);
    padding: 1rem;
    border-radius: 4px;
    text-align: center;
  }
  .stat-card h3 {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
  }
  .stat-card p {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--spotify-green);
  }
  
  /* List styles for stats */
  .stats-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
  }
  .stats-list li {
    padding: 10px;
    border-bottom: 1px solid #eee;
  }
  .stats-list li:last-child {
    border-bottom: none;
  }
  
  /* Top list (legacy/future use) */
  .top-list {
    list-style-position: inside;
    padding: 0;
    margin: 0;
  }
  .top-list li {
    padding: 8px 0;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .top-list li:last-child {
    border-bottom: none;
  }
  .item-name {
    font-weight: 500;
    flex: 1;
  }
  .item-count {
    color: var(--spotify-green);
    font-weight: bold;
  }
  
  /* Results container and text */
  #results-container {
    margin-top: 20px;
  }
  .results-text {
    font-family: monospace;
    font-size: 14px;
    white-space: pre;
    padding: 20px;
  }
  
  /* Error message */
  .error {
    color: #d9534f;
    font-weight: bold;
  }
  
  /* Authentication success message */
  .auth-success {
    background-color: var(--spotify-green);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    margin-top: 1rem;
    animation: fadeOut 5s forwards;
  }
  @keyframes fadeOut {
    0% { opacity: 1; }
    70% { opacity: 1; }
    100% { opacity: 0; }
  }
  
  /* Responsive adjustments */
  @media (max-width: 768px) {
    .stats-grid {
      grid-template-columns: 1fr 1fr;
    }
    .filters {
      flex-direction: column;
      align-items: stretch;
    }
  }
  @media (max-width: 480px) {
    .stats-grid {
      grid-template-columns: 1fr;
    }
    .card {
      padding: 1.5rem;
    }
    .nav-link {
      display: block;
      margin: 0.5rem 0;
    }
  }
  
  /* Footer */
  footer {
    text-align: center;
    margin-top: 2rem;
    padding: 1rem;
    color: #666;
    font-size: 0.9rem;
  }
  
  .year-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
    justify-content: center;
  }
  .year-button {
    background-color: #e0e0e0;
    color: #333;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
  }
  .year-button.active,
  .year-button:hover {
    background-color: var(--spotify-green);
    color: white;
  }
  
  .sort-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
  }

  .sort-buttons {
    display: flex;
    gap: 8px;
    margin-bottom: 0; /* Override the existing margin */
}

  .sort-button {
      padding: 6px 12px;
      background-color: var(--medium-gray);
      color: var(--dark-gray);
      border: none;
      border-radius: 4px;
      font-size: 0.9rem;
      cursor: pointer;
      transition: background-color 0.3s, color 0.3s;
  }

  .sort-button:hover {
      background-color: #d0d0d0;
  }

  .sort-button.active {
      background-color: var(--spotify-green);
      color: white;
  }

  .entry-number {
    color: var(--spotify-green);
    font-weight: bold;
    margin-right: 8px;
}

  .delete-link {
      color: #e74c3c; 
      font-weight: bold;
      cursor: pointer;
  }
  .delete-link:focus,
  .delete-link:hover {
      text-decoration: underline;
      color: #c0392b;
  }