html,
body {
  margin: 0;
  padding: 0;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #ddd;
  background: #000;
  position: sticky;
  top: 0;
  z-index: 20;
}

.top-nav__title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
  margin: 0;
}

.top-nav__search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.top-nav__search input {
  min-width: 220px;
  max-width: 45vw;
  height: 36px;
  padding: 0 0.6rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.top-nav__search button {
  height: 36px;
  padding: 0 0.75rem;
  border: 1px solid #333;
  background: #333;
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

main {
  padding: 0;
}

@media (max-width: 768px) {
  .top-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .top-nav__search {
    width: 100%;
  }

  .top-nav__search input {
    min-width: 0;
    max-width: none;
    width: 100%;
  }
}