:root {
      --primary-color: #00FF00;
      --primary-dark: #00CC00;
      --secondary-color: #333;
      --background-dark: #111;
      --text-light: #fff;
      --text-secondary: #ccc;
      --card-bg: #444;
      --card-hover-bg: #333;
      --transition-standard: all 0.3s ease-in-out;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      margin: 0;
      font-family: 'Roboto', sans-serif;
      background: linear-gradient(135deg, #333333, #000000);
      color: var(--text-light);
      line-height: 1.6;
    }

    header {
      background: var(--secondary-color);
      color: var(--text-light);
      padding: 2rem;
      text-align: center;
      border-bottom: 4px solid var(--primary-color);
    }

    .logo {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 1rem;
      font-size: 1.8rem;
    }

    .logo img {
      width: 50px;
      height: 50px;
      border-radius: 50%;
    }

    h1 {
      font-family: 'Press Start 2P', cursive;
      font-size: 2.5rem;
      color: var(--primary-color);
      margin: 0;
    }

    header p {
      color: var(--text-secondary);
      text-shadow: 0 0 5px var(--primary-color);
      font-style: italic;
      margin-top: 1rem;
    }

    .nav-container {
      background: var(--background-dark);
      color: var(--text-light);
      padding: 0;
      position: sticky;
      top: 0;
      z-index: 1000;
    }

    nav {
      max-width: 1200px;
      margin: 0 auto;
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      padding: 1rem 0;
    }

    nav a {
      color: var(--text-light);
      text-decoration: none;
      margin: 0.5rem 1.5rem;
      font-size: 1.1rem;
      font-weight: 500;
      transition: var(--transition-standard);
      position: relative;
      padding: 0.25rem 0;
    }

    nav a:hover {
      color: var(--primary-color);
    }

    nav a.active {
      color: var(--primary-color);
    }

    nav a::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 0;
      background-color: var(--primary-color);
      transition: var(--transition-standard);
    }

    nav a:hover::after,
    nav a.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text-light);
      font-size: 1.5rem;
      cursor: pointer;
      padding: 0.5rem;
    }

    .content {
      padding: 2rem;
      max-width: 1200px;
      margin: 0 auto;
    }

    .card {
      background: var(--card-bg);
      border-radius: 8px;
      padding: 2rem;
      margin-bottom: 2rem;
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
      transform: translateY(0);
      opacity: 0;
      transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease, border 0.3s ease;
      border: 2px solid transparent;
    }

    .card:hover {
      transform: translateY(-10px);
      box-shadow: 0 0 20px 10px rgba(0, 255, 0, 0.3);
      border: 2px solid var(--primary-color);
      background: var(--card-hover-bg);
    }

    .card.visible {
      opacity: 1;
      transform: translateY(0);
      transition: transform 0.3s ease, opacity 0.5s ease;
    }

    .card h2 {
      font-size: 2rem;
      color: var(--primary-color);
      margin-bottom: 1rem;
    }

    .card p {
      font-size: 1.1rem;
      color: var(--text-light);
    }

    .about-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 1.5rem;
      margin-top: 1.5rem;
    }

    .about-feature {
      background: rgba(0, 0, 0, 0.2);
      padding: 1.5rem;
      border-radius: 8px;
      text-align: center;
      transition: var(--transition-standard);
    }

    .about-feature:hover {
      background: rgba(0, 255, 0, 0.1);
      transform: translateY(-5px);
    }

    .about-feature i {
      font-size: 2.5rem;
      color: var(--primary-color);
      margin-bottom: 1rem;
    }

    .about-feature h3 {
      font-size: 1.3rem;
      margin-bottom: 0.5rem;
    }

    .event-details {
      max-height: 0;
      overflow: hidden;
      padding: 0;
      transition: max-height 0.4s ease-out, padding 0.3s ease-out;
      background: #333;
      border-radius: 5px;
      margin-top: 0.5rem;
    }

    .event-item {
      cursor: pointer;
      padding: 1rem;
      background: #555;
      border-radius: 5px;
      margin-bottom: 1rem;
      transition: background-color 0.3s ease;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .event-item:hover {
      background-color: rgba(0, 255, 0, 0.2);
    }

    .event-item:active {
      background-color: rgba(0, 255, 0, 0.3);
    }

    .event-item.open .event-details {
      max-height: 500px;
      padding: 1rem;
    }

    .event-item .toggle-icon {
      transform: rotate(0deg);
      transition: transform 0.3s ease;
    }

    .event-item.open .toggle-icon {
      transform: rotate(180deg);
    }

    footer {
      background: var(--secondary-color);
      color: var(--text-light);
      text-align: center;
      padding: 2rem 1rem;
      margin-top: 2rem;
    }

    .footer-content {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
      text-align: left;
    }

    .footer-section h3 {
      color: var(--primary-color);
      margin-bottom: 1rem;
      font-size: 1.3rem;
    }

    .footer-section ul {
      list-style: none;
      padding: 0;
    }

    .footer-section ul li {
      margin-bottom: 0.5rem;
    }

    .footer-section a {
      color: var(--text-secondary);
      text-decoration: none;
      transition: var(--transition-standard);
    }

    .footer-section a:hover {
      color: var(--primary-color);
    }

    .social-icons {
      display: flex;
      gap: 1rem;
      margin-top: 1rem;
    }

    .social-icons a {
      color: var(--text-light);
      font-size: 1.5rem;
      transition: var(--transition-standard);
    }

    .social-icons a:hover {
      color: var(--primary-color);
      transform: translateY(-3px);
    }

    .copyright {
      margin-top: 2rem;
      padding-top: 1rem;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      text-align: center;
    }

    iframe {
      display: block;
      margin: 1rem auto;
      max-width: 100%;
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    }

    #topBtn {
      position: fixed;
      bottom: 20px;
      right: 20px;
      font-size: 1.5rem;
      background: var(--primary-color);
      color: #000;
      border: none;
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 0 10px var(--primary-color);
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.3s ease, transform 0.3s ease;
      z-index: 999;
    }

    #topBtn.visible {
      opacity: 1;
      transform: translateY(0);
    }

    #topBtn:hover {
      background: var(--primary-dark);
    }

    .contact-methods {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
      margin-top: 1.5rem;
    }

    .contact-method {
      text-align: center;
      padding: 1.5rem;
      background: rgba(0, 0, 0, 0.2);
      border-radius: 8px;
      transition: var(--transition-standard);
    }

    .contact-method:hover {
      background: rgba(0, 255, 0, 0.1);
      transform: translateY(-5px);
    }

    .contact-method i {
      font-size: 2.5rem;
      color: var(--primary-color);
      margin-bottom: 1rem;
    }

    .contact-method h3 {
      margin-bottom: 0.5rem;
    }

    .contact-method a {
      color: var(--primary-color);
      text-decoration: none;
      transition: var(--transition-standard);
    }

    .contact-method a:hover {
      text-decoration: underline;
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 2rem;
      }

      .nav-container {
        position: relative;
      }

      .hamburger {
        display: block;
        position: absolute;
        right: 1rem;
        top: 1rem;
        z-index: 1001;
      }

      nav {
        flex-direction: column;
        align-items: center;
        padding: 0.5rem 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.5s ease;
      }

      nav.open {
        max-height: 500px;
        padding: 1rem 0;
      }

      nav a {
        margin: 0.5rem 0;
        font-size: 1.1rem;
        width: 100%;
        text-align: center;
      }

      .content {
        padding: 1.5rem;
      }

      .card {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
      }

      .about-grid,
      .contact-methods {
        grid-template-columns: 1fr;
      }

      .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
      }

      .social-icons {
        justify-content: center;
      }
    }

    @media (max-width: 480px) {
      h1 {
        font-size: 1.6rem;
      }

      .event-item {
        flex-direction: column;
        align-items: flex-start;
      }

      .event-item .toggle-icon {
        margin-top: 0.5rem;
      }

      .card h2 {
        font-size: 1.7rem;

        /* Stile für das Kontaktformular */
        #contact-form {
            width: 100%;
            max-width: 500px;
            margin: 0 auto;
        }

        #contact-form .form-group {
            margin-bottom: 1rem;
        }

        #contact-form label {
            display: block;
            margin-bottom: 0.5rem;
            color: var(--text-light);
        }

        #contact-form input,
        #contact-form textarea {
            width: 100%;
            padding: 0.75rem;
            background-color: rgba(0, 0, 0, 0.2);
            border: 1px solid #444;
            border-radius: 4px;
            color: var(--text-light);
            font-family: 'Roboto', sans-serif;
            transition: var(--transition-standard);
        }

        #contact-form input:focus,
        #contact-form textarea:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 2px rgba(0, 255, 0, 0.2);
        }

        #contact-form button {
            background-color: var(--primary-color);
            color: #000;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 500;
            transition: var(--transition-standard);
            margin-top: 1rem;
        }

        #contact-form button:hover {
            background-color: var(--primary-dark);
            transform: translateY(-3px);
        }

        .success-message {
            background-color: rgba(40, 167, 69, 0.2);
            color: #28a745;
            padding: 0.75rem;
            border-radius: 4px;
            margin: 1rem 0;
        }

        .error-message {
            background-color: rgba(220, 53, 69, 0.2);
            color: #dc3545;
            padding: 0.75rem;
            border-radius: 4px;
            margin: 1rem 0;
        }

        .loading-message {
            background-color: rgba(0, 123, 255, 0.2);
            color: #0d6efd;
            padding: 0.75rem;
            border-radius: 4px;
            margin: 1rem 0;
        }
      }
    }