So fügst du ein Seitenmenü zu deiner Carrd-Website hinzu (2026)

<style>
  :root {
    /* Sidebar Configuration */
    --sidebar-position: left; /* Options: 'left' or 'right' */
    --sidebar-width: 300px;
    --sidebar-bg-color: rgba(25, 25, 25, 0.95);
    --sidebar-text-color: #ffffff;
    --sidebar-border-color: #444;
    --sidebar-hover-color: rgba(255, 255, 255, 0.1);
    --sidebar-accent-color: #007bff;
    --contact-button-hover-color: #0056b3;

    /* Menu Button Configuration */
    --menu-button-bg: rgba(0, 123, 255, 0.9);
    --menu-button-color: #ffffff;
    --menu-button-size: 50px;
    --menu-button-floating: true; /* Options: 'true' or 'false' (string, not boolean) */
    --menu-button-float-position: top; /* Options: 'top' or 'bottom' (only when floating is true) */
    --menu-button-float-side: left; /* Options: 'left' or 'right' (only when floating is true) */
    --menu-button-position-top: 20px;
    --menu-button-position-side: 20px;

    /* Animation Settings */
    --sidebar-animation-speed: 0.3s;
    --button-animation-speed: 0.2s;

    /* Typography */
    --sidebar-font-family: inherit;
    --sidebar-font-size: 16px;
    --sidebar-heading-size: 20px;

    /* Spacing */
    --sidebar-padding: 20px;
    --menu-item-spacing: 15px;
  }

  /* Scoped box-sizing reset (no global * selector) */
  #sidebarToggle,
  .sidebar-overlay,
  #sidebarMenu,
  #sidebarMenu * {
    box-sizing: border-box;
  }

  /* Menu Toggle Button */
  .sidebar-menu-toggle {
    background-color: var(--menu-button-bg);
    color: var(--menu-button-color);
    border: none;
    width: var(--menu-button-size);
    height: var(--menu-button-size);
    border-radius: 50%;
    cursor: pointer;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all var(--button-animation-speed) ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  /* Floating button positioning */
  .sidebar-menu-toggle.floating {
    position: fixed;
  }

  .sidebar-menu-toggle.floating.float-top {
    top: var(--menu-button-position-top);
  }

  .sidebar-menu-toggle.floating.float-bottom {
    bottom: var(--menu-button-position-top);
  }

  .sidebar-menu-toggle.floating.float-left {
    left: var(--menu-button-position-side);
  }

  .sidebar-menu-toggle.floating.float-right {
    right: var(--menu-button-position-side);
  }

  /* Static button positioning (when not floating) */
  .sidebar-menu-toggle.static {
    position: relative;
    margin: 10px;
  }

  .sidebar-menu-toggle.static[data-position="left"] {
    left: var(--menu-button-position-side);
  }

  .sidebar-menu-toggle.static[data-position="right"] {
    right: var(--menu-button-position-side);
  }

  .sidebar-menu-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
  }

  /* Hamburger Icon */
  .hamburger-icon {
    width: 20px;
    height: 2px;
    background-color: var(--menu-button-color);
    margin: 2px 0;
    transition: all var(--button-animation-speed) ease;
    transform-origin: center;
  }

  /* Hamburger to X animation */
  .sidebar-menu-toggle.active .hamburger-icon:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .sidebar-menu-toggle.active .hamburger-icon:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .sidebar-menu-toggle.active .hamburger-icon:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  /* Sidebar Overlay */
  .sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--sidebar-animation-speed) ease;
  }

  .sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
  }

  /* Sidebar Menu */
  .sidebar-menu {
    position: fixed;
    top: 0;
    width: var(--sidebar-width);
    height: 100%;
    background-color: var(--sidebar-bg-color);
    color: var(--sidebar-text-color);
    z-index: 1000;
    padding: var(--sidebar-padding);
    font-family: var(--sidebar-font-family);
    font-size: var(--sidebar-font-size);
    /* visibility keeps the closed panel's links out of the Tab order;
       the delay lets the slide-out finish before it hides */
    visibility: hidden;
    transition: transform var(--sidebar-animation-speed) ease,
                visibility 0s linear var(--sidebar-animation-speed);
    overflow-y: auto;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
  }

  /* Sidebar positioning based on CSS variable */
  .sidebar-menu[data-position="left"] {
    left: 0;
    transform: translateX(-100%);
    border-right: 1px solid var(--sidebar-border-color);
  }

  .sidebar-menu[data-position="right"] {
    right: 0;
    transform: translateX(100%);
    border-left: 1px solid var(--sidebar-border-color);
  }

  .sidebar-menu.active {
    transform: translateX(0);
    visibility: visible;
    transition: transform var(--sidebar-animation-speed) ease;
  }

  /* Close Button */
  .sidebar-close {
    position: absolute;
    top: 15px;
    background: none;
    border: none;
    color: var(--sidebar-text-color);
    font-size: 24px;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color var(--button-animation-speed) ease;
  }

  .sidebar-close[data-position="left"] {
    right: 15px;
  }

  .sidebar-close[data-position="right"] {
    left: 15px;
  }

  .sidebar-close:hover {
    background-color: var(--sidebar-hover-color);
  }

  /* Sidebar Header */
  .sidebar-header {
    margin-top: 50px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--sidebar-border-color);
  }

  .sidebar-title {
    font-size: var(--sidebar-heading-size);
    font-weight: bold;
    margin: 0;
    color: var(--sidebar-accent-color);
  }

  /* Navigation Menu */
  .sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .sidebar-nav li {
    margin-bottom: var(--menu-item-spacing);
  }

  .sidebar-nav a {
    color: var(--sidebar-text-color);
    text-decoration: none;
    display: block;
    padding: 12px 15px;
    border-radius: 8px;
    transition: all var(--button-animation-speed) ease;
    border-left: 3px solid transparent;
  }

  .sidebar-nav a:hover {
    background-color: var(--sidebar-hover-color);
    border-left-color: var(--sidebar-accent-color);
    transform: translateX(5px);
  }

  /* Contact Button */
  .sidebar-contact-btn {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--sidebar-border-color);
  }

  .contact-button {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: var(--sidebar-accent-color);
    color: white;
    text-decoration: none;
    text-align: center;
    border-radius: 8px;
    font-weight: bold;
    transition: all var(--button-animation-speed) ease;
    border: none;
    cursor: pointer;
    font-size: var(--sidebar-font-size);
  }

  .contact-button:hover {
    background-color: var(--contact-button-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 123, 255, 0.3);
  }

  /* Mobile Responsiveness */
  @media (max-width: 768px) {
    :root {
      --sidebar-width: 280px;
      --sidebar-font-size: 15px;
      --sidebar-heading-size: 18px;
      --menu-button-size: 45px;
    }
  }

  @media (max-width: 480px) {
    :root {
      --sidebar-width: 250px;
      --sidebar-font-size: 14px;
      --sidebar-heading-size: 16px;
      --menu-button-size: 40px;
      --menu-button-position-top: 15px;
      --menu-button-position-side: 15px;
    }
  }

  /* Prevent body scroll when sidebar is open (includes iOS fix) */
  body.sidebar-open {
    overflow: hidden;
    touch-action: none;
  }
</style>

<!-- Menu Toggle Button (with accessibility attributes) -->
<button class="sidebar-menu-toggle" id="sidebarToggle"
        aria-label="Open menu" aria-expanded="false" aria-controls="sidebarMenu">
  <span class="hamburger-icon" aria-hidden="true"></span>
  <span class="hamburger-icon" aria-hidden="true"></span>
  <span class="hamburger-icon" aria-hidden="true"></span>
</button>

<!-- Sidebar Overlay -->
<div class="sidebar-overlay" id="sidebarOverlay"></div>

<!-- Sidebar Menu -->
<nav class="sidebar-menu" id="sidebarMenu" aria-hidden="true" tabindex="-1">
  <button class="sidebar-close" id="sidebarClose" aria-label="Close menu">&times;</button>

  <div class="sidebar-header">
    <h3 class="sidebar-title">Navigation</h3>
  </div>

  <ul class="sidebar-nav">
    <li><a href="#home">Home</a></li>
    <li><a href="#about">About</a></li>
    <li><a href="#services">Services</a></li>
    <li><a href="#portfolio">Portfolio</a></li>
    <li><a href="#testimonials">Testimonials</a></li>
    <li><a href="#blog">Blog</a></li>
  </ul>

  <div class="sidebar-contact-btn">
    <a href="#contact" class="contact-button">Contact Us</a>
  </div>
</nav>

<script>
document.addEventListener('DOMContentLoaded', function() {
  // Get elements
  const toggleBtn = document.getElementById('sidebarToggle');
  const closeBtn = document.getElementById('sidebarClose');
  const overlay = document.getElementById('sidebarOverlay');
  const sidebar = document.getElementById('sidebarMenu');
  const body = document.body;
  let savedScrollTop = 0;

  // Get CSS variables
  const sidebarPosition = getComputedStyle(document.documentElement)
    .getPropertyValue('--sidebar-position').trim();
  const isFloating = getComputedStyle(document.documentElement)
    .getPropertyValue('--menu-button-floating').trim() === 'true';
  const floatPosition = getComputedStyle(document.documentElement)
    .getPropertyValue('--menu-button-float-position').trim();
  const floatSide = getComputedStyle(document.documentElement)
    .getPropertyValue('--menu-button-float-side').trim();

  // Set button positioning classes
  if (isFloating) {
    toggleBtn.classList.add('floating');
    if (floatPosition === 'bottom') {
      toggleBtn.classList.add('float-bottom');
    } else {
      toggleBtn.classList.add('float-top');
    }
    if (floatSide === 'right') {
      toggleBtn.classList.add('float-right');
    } else {
      toggleBtn.classList.add('float-left');
    }
  } else {
    toggleBtn.classList.add('static');
  }

  // Set data attributes for positioning
  toggleBtn.setAttribute('data-position', sidebarPosition);
  closeBtn.setAttribute('data-position', sidebarPosition);
  sidebar.setAttribute('data-position', sidebarPosition);

  // Open sidebar function
  function openSidebar() {
    sidebar.classList.add('active');
    overlay.classList.add('active');
    toggleBtn.classList.add('active');
    body.classList.add('sidebar-open');

    // Accessibility: update ARIA states
    toggleBtn.setAttribute('aria-expanded', 'true');
    toggleBtn.setAttribute('aria-label', 'Close menu');
    sidebar.removeAttribute('aria-hidden');

    // iOS scroll-lock: use position: fixed to prevent background scroll
    savedScrollTop = window.pageYOffset || document.documentElement.scrollTop;
    body.style.position = 'fixed';
    body.style.top = '-' + savedScrollTop + 'px';
    body.style.width = '100%';

    // Focus management: move focus into sidebar
    sidebar.focus({ preventScroll: true });
  }

  // Close sidebar function
  function closeSidebar() {
    sidebar.classList.remove('active');
    overlay.classList.remove('active');
    toggleBtn.classList.remove('active');
    body.classList.remove('sidebar-open');

    // Accessibility: update ARIA states
    toggleBtn.setAttribute('aria-expanded', 'false');
    toggleBtn.setAttribute('aria-label', 'Open menu');
    sidebar.setAttribute('aria-hidden', 'true');

    // iOS scroll-lock: restore scroll position
    body.style.position = '';
    body.style.top = '';
    body.style.width = '';
    // Jump straight back even if the site uses smooth scrolling
    const html = document.documentElement;
    html.style.scrollBehavior = 'auto';
    window.scrollTo(0, savedScrollTop);
    html.style.scrollBehavior = '';

    // Focus management: return focus to toggle button
    toggleBtn.focus({ preventScroll: true });
  }

  // Tab-key focus trap inside sidebar when open
  sidebar.addEventListener('keydown', function(e) {
    if (e.key === 'Tab' && sidebar.classList.contains('active')) {
      const focusable = sidebar.querySelectorAll(
        'a[href], button, [tabindex]:not([tabindex="-1"])'
      );
      const first = focusable[0];
      const last = focusable[focusable.length - 1];

      if (e.shiftKey && (document.activeElement === first || document.activeElement === sidebar)) {
        e.preventDefault();
        last.focus();
      } else if (!e.shiftKey && document.activeElement === last) {
        e.preventDefault();
        first.focus();
      }
    }
  });

  // Event listeners
  toggleBtn.addEventListener('click', function(e) {
    e.stopPropagation();
    if (sidebar.classList.contains('active')) {
      closeSidebar();
    } else {
      openSidebar();
    }
  });

  closeBtn.addEventListener('click', closeSidebar);
  overlay.addEventListener('click', closeSidebar);

  // Close sidebar when clicking on navigation links
  const navLinks = document.querySelectorAll('.sidebar-nav a, .contact-button');
  navLinks.forEach(function(link) {
    link.addEventListener('click', function() {
      closeSidebar();
    });
  });

  // Close sidebar on Escape key
  document.addEventListener('keydown', function(e) {
    if (e.key === 'Escape' && sidebar.classList.contains('active')) {
      closeSidebar();
    }
  });

  // Handle window resize
  window.addEventListener('resize', function() {
    if (window.innerWidth > 768 && sidebar.classList.contains('active')) {
      closeSidebar();
    }
  });
});
</script>

<ul class="sidebar-nav">
  <li><a href="#home">Home</a></li>
  <li><a href="#about">About</a></li>
  <li><a href="#services">Services</a></li>
  <li><a href="#portfolio">Portfolio</a></li>
  <li><a href="#testimonials">Testimonials</a></li>
  <li><a href="#blog">Blog</a></li>
</ul>

<a href="#contact" class="contact-button">Contact Us</a>