:root {
      --bg-color: #000000;
      --fg-color: #ffffff;
      --accent-color: #3376f2;
      --card-color: #3c4148;
      --border-color: #444;
      --bg: #333;
      --popup-bg: #2a2a2a;
      --button-color: #1a3b7a;
    }

    body {
      font-family: 'Inter', system-ui, sans-serif;
      background-color: var(--bg-color);
      color: var(--fg-color);
      margin: 0;
      padding: 20px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    h1 {
      font-size: 2.3rem;
      margin-bottom: 20px;
    }
    
    a {
      color: var(--accent-color);
      text-decoration: none;
      font-weight: 500;
    }
    a:hover {
      text-decoration: underline;
    }
    
    .button {
      display: inline-block;
      padding: 12px 20px;
      background-color: var(--button-color);
      color: var(--fg-color);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin: 15px;
      font-weight: bold;
      cursor: pointer;
      font-size: 1.1rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }

    .container {
      width: 90%;
      max-width: 90%;
      background-color: var(--bg);
      border: 1px solid var(--border-color);
      padding: 25px;
      margin: 20px auto;
      border-radius: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }

    #searchForm {
      display: flex;
      flex-direction: row;
      flex-wrap: wrap;
      width: fit-content;
      margin-right: auto;
      margin-left: auto;
      margin-top: 15px;
      margin-bottom: 15px;
    }

    #searchInput {
      flex: 1 1 auto;
      padding: 12px 20px;
      border: 1px solid var(--border-color);
      background-color: var(--card-color);
      color: var(--fg-color);
      font-size: 1rem;
      border-radius: 8px 0 0 8px;
      min-width: 0;
    }

    button[type="submit"] {
      flex: 0 0 auto;
      padding: 12px 24px;
      border: 1px solid var(--border-color);
      background-color: var(--button-color);
      color: white;
      font-weight: bold;
      font-size: 1rem;
      cursor: pointer;
      border-radius: 0 8px 8px 0;
      white-space: nowrap;
    }

    #searchInput:focus {
      outline: none;
      border-color: var(--accent-color);
    }

    #genreSelect {
      flex: 0 0 auto;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      background-color: var(--card-color);
      color: var(--fg-color);
      font-size: 1rem;
      border-radius: 8px;
      margin-right: 10px;
    }

    #filterBtn {
      display: none;
      background-color: var(--button-color);
      color: white;
      font-size: 1.1rem;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 12px;
      cursor: pointer;
    }

    button:hover {
      background-color: var(--accent-color);
    }

    #bookList {
      margin-top: 20px;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      width: 100%;
    }

    #suggestions {
      margin-top: 40px;
      width: 100%;
      max-width: 1200px;
    }

    #suggestions h3 {
      font-size: 1.5rem;
      margin-bottom: 15px;
    }

    .suggestions-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 15px;
    }

    .book-card {
      position: relative;
      background-color: var(--card-color);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 16px 16px 70px 16px;
      text-align: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      cursor: pointer;
      align-items: center;
      text-align: center;
    }

    .book-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
    }

    .book-card strong {
      position: relative;
      font-size: 1.1rem;
      display: block;
      margin-bottom: 10px;
    }

    .book-card .button {
      display: block;
      position: absolute;
      width: fit-content;
      bottom: 0;
      left: 0;
      right: 0;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 15px;
      margin-top: 15px;
      padding: 12px 20px;
      background-color: var(--button-color);
      color: var(--fg-color);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-weight: bold;
      cursor: pointer;
      font-size: 1.1rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      text-decoration: none;
    }

    .no-results {
      text-align: center;
      font-size: 1.2rem;
      font-weight: bold;
      color: var(--fg-color);
      margin-top: 20px;
    }

    .report-buttons {
      margin-top: 40px;
      text-align: center;
    }

    .popup {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.8);
      justify-content: center;
      align-items: center;
      z-index: 1000;
      animation: 0.5s ease-in;
    }

    .popup-content {
      background: var(--popup-bg);
      padding: 20px;
      border-radius: 12px;
      max-width: 600px;
      width: 90%;
      position: relative;
      max-height: 80vh;
      overflow-y: auto;
      transform: translateY(-100%);
      opacity: 0;
      animation: slideDown 0.5s ease-out forwards;
    }

    @keyframes slideDown {
      to {
        transform: translateY(0);
        opacity: 1;
      }
    }

    .popup-content h2 {
      margin-top: 0;
      font-size: 1.5rem;
      text-align: center;
    }

    .popup-content .field-label {
      font-size: 1.2rem;
      font-weight: 600;
      margin: 12px 0 4px;
      display: block;
    }

    .popup-content .field-content {
      font-size: 1rem;
      margin: 0 0 12px;
      display: block;
    }

    .popup-close {
      position: absolute;
      top: 10px;
      right: 15px;
      font-size: 1.5rem;
      background: none;
      border: none;
      cursor: pointer;
      color: var(--fg-color);
    }

    .popup-close:hover {
      color: var(--accent-color);
    }

    @media (max-width: 800px) {
      #searchForm {
        flex-direction: column;
        gap: 20px;
        width: 100%;
      }

      #searchInput {
        border-radius: 8px;
      }

      button[type="submit"] {
        width: 100%;
        border-radius: 8px;
      }
    }