body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background-color: #f9f9f9;
      text-align: left;
      margin: 0;
      padding: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      animation: slideUp 0.5s ease-out forwards;
    }
    
    @keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

    #container {
      width: 90%;
      max-width: 700px;
      background-color: #fff;
      padding: 30px;
      border-radius: 15px;
      box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
      margin: 20px;
    }

    h1 {
      color: #2c3e50;
      font-weight: bold;
      margin-bottom: 20px;
      text-align: center;
    }

    #options {
      margin-top: 20px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    label {
      margin-bottom: 10px;
      text-align: left;
    }

    select,
    input[type="range"] {
      width: 80%;
      margin-bottom: 10px;
      padding: 8px;
      border: 1px solid #ddd;
      border-radius: 5px;
      display: inline-block;
      background-color: #ecf0f1;
    }

    input[type="range"]::-webkit-slider-thumb {
      background-color: #3498db;
    }

    input[type="range"]::-webkit-slider-thumb::before {
      content: "👈";
      display: inline-block;
      position: absolute;
      left: -15px;
    }

    input[type="range"]::-webkit-slider-thumb::after {
      content: "👉";
      display: inline-block;
      position: absolute;
      right: -15px;
    }

    .range-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 80%;
    }

    .range-value {
      width: 30px;
      text-align: center;
      font-size: 14px;
      color: #555;
    }

    .button-container {
      display: flex;
      justify-content: center;
      width: 80%;
      margin-bottom: 10px;
      gap: 15px;
    }

    button {
      background-color: #3498db;
      color: #fff;
      border: none;
      padding: 12px 24px;
      text-align: center;
      text-decoration: none;
      display: inline-block;
      font-size: 16px;
      border-radius: 8px;
      cursor: pointer;
      transition: background-color 0.3s ease;
    }

    button:hover {
      background-color: #2980b9;
    }

    button:last-child {
      background-color: #e74c3c;
    }

    button:last-child:hover {
      background-color: #c0392b;
    }

    #content {
      margin-top: 30px;
      font-size: 18px;
      padding: 20px;
      border: 1px solid #ddd;
      border-radius: 8px;
      background-color: #fafafa;
      min-height: 150px;
      display: flex;
      align-items: flex-start;
      justify-content: flex-start;
      white-space: pre-wrap;
      word-wrap: break-word;
      direction: ltr;
    }

    #timer {
      margin-top: 20px;
      font-size: 16px;
      color: #888;
      text-align: left;
    }

    #progress-bar-container {
      width: 80%;
      margin: 20px auto;
      height: 8px;
      background-color: #ecf0f1;
      border-radius: 10px;
      overflow: hidden;
    }

    #progress-bar {
      height: 100%;
      width: 0;
      background-color: #3498db;
      border-radius: 10px;
      transition: width 0.3s ease;
    }

    button i {
      color: white;
      margin-right: 5px;
    }
    
    #advanced-settings {
      display: none;
      animation: fade-in 0.5s ease-in-out;
    }

    @keyframes fade-in {
      from {
        opacity: 0;
      }
      to {
        opacity: 1;
      }
    }

    /* Gelişmiş Ayar Butonu Stilleri */
    #advanced-settings-button span:hover {
      color: #3498db;
      transition: color 0.3s ease;
    }