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.cf23 {
  position: relative;
  width: 100%;
  padding: 56px 32px 22px;
  background: #fef9f0;
  color: #2a2520;
  font-family: ui-serif, Georgia, serif;
  box-sizing: border-box;
}
.cf23top {
  position: absolute;
  top: -22px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #c43a32;
  color: #fef9f0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(196, 58, 50, 0.35);
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  cursor: pointer;
}
.cf23top:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(196, 58, 50, 0.45);
}
.cf23top span {
  font:
    700 22px/1 ui-sans-serif,
    system-ui;
}
.cf23b {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 36px;
  max-width: 1200px;
  margin: 0 auto 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(42, 37, 32, 0.18);
}
.cf23brand {
  min-width: 0;
}
.cf23logo {
  font:
    700 22px/1 ui-serif,
    Georgia,
    serif;
  color: #2a2520;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.cf23brand p {
  margin: 0;
  font:
    italic 14px/1.55 ui-serif,
    Georgia,
    serif;
  color: #6b6056;
  max-width: 240px;
}
.cf23cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  min-width: 0;
}
.cf23col {
  display: flex;
  flex-direction: column;
  gap: 9px;
  min-width: 0;
}
.cf23col h4 {
  margin: 0 0 4px;
  font:
    700 11px/1 ui-sans-serif,
    system-ui;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #c43a32;
}
.cf23col a {
  position: relative;
  padding-bottom: 4px;
  font:
    14px/1.4 ui-serif,
    Georgia,
    serif;
  color: #2a2520;
  text-decoration: none;
  transition: color 0.25s;
  align-self: flex-start;
}
.cf23col a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 6'%3E%3Cpath d='M0 3 Q 3 0 6 3 T 12 3 T 18 3 T 24 3' stroke='%23c43a32' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: repeat-x;
  background-size: 12px 6px;
  background-position: 0 100%;
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform 0.35s cubic-bezier(0.65, 0, 0.35, 1);
}
.cf23col a:hover {
  color: #c43a32;
}
.cf23col a:hover::after {
  transform: scaleX(1);
}
.cf23meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  max-width: 1200px;
  margin: 0 auto;
  font:
    italic 12px/1.5 ui-serif,
    Georgia,
    serif;
  color: #8a7d6f;
  flex-wrap: wrap;
}
.cf23legal {
  display: flex;
  gap: 18px;
}
.cf23legal a {
  color: #6b6056;
  text-decoration: none;
  transition: color 0.2s;
  font-style: normal;
}
.cf23legal a:hover {
  color: #c43a32;
}
@media (max-width: 880px) {
  .cf23b {
    grid-template-columns: 1fr;
  }
  .cf23cols {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 480px) {
  .cf23cols {
    grid-template-columns: 1fr;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cf23col a::after {
    transition: none;
  }
  .cf23top {
    transition: none;
  }
}
<footer class="cf23">
  <a href="#top" class="cf23top" data-cf23-top aria-label="Back to top"><span>↑</span></a>
  <div class="cf23b">
    <div class="cf23brand">
      <div class="cf23logo">◆ Wavelength</div>
      <p>The newsletter app for thoughtful writers.</p>
    </div>
    <div class="cf23cols">
      <div class="cf23col">
        <h4>Product</h4>
        <a href="#">Editor</a>
        <a href="#">Distribution</a>
        <a href="#">Analytics</a>
        <a href="#">Pricing</a>
      </div>
      <div class="cf23col">
        <h4>Writers</h4>
        <a href="#">Featured</a>
        <a href="#">Get started</a>
        <a href="#">Migrate</a>
        <a href="#">Community</a>
      </div>
      <div class="cf23col">
        <h4>Readers</h4>
        <a href="#">Discover</a>
        <a href="#">Categories</a>
        <a href="#">Mobile app</a>
        <a href="#">Recommendations</a>
      </div>
      <div class="cf23col">
        <h4>Company</h4>
        <a href="#">About</a>
        <a href="#">Careers</a>
        <a href="#">Blog</a>
        <a href="#">Press</a>
      </div>
    </div>
  </div>
  <div class="cf23meta">
    <span>© 2026 Wavelength · Made for writers, by writers.</span>
    <div class="cf23legal">
      <a href="#">Privacy</a>
      <a href="#">Terms</a>
      <a href="#">Contact</a>
    </div>
  </div>
</footer>
/* Hover Wave + Back-to-Top — handles only the scroll-to-top behavior;
   the wave underline is pure CSS. */
(function () {
  var btn = document.querySelector("[data-cf23-top]");
  if (!btn) return;
  btn.addEventListener("click", function (e) {
    e.preventDefault();
    window.scrollTo({ top: 0, behavior: "smooth" });
  });
})();
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