.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-block: var(--space-3);
  flex-wrap: wrap;
}

.logo {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--color-red);
  letter-spacing: 0.05rem;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  gap: var(--space-3);
  flex: 1;
}

.main-nav a {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  padding-block: var(--space-1);
  border-bottom: 2px solid transparent;
}

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

.main-nav a.active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-red);
}

.search-form {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
}

.search-form input[type="search"] {
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--fs-sm);
  width: 18rem;
}

.search-form input[type="search"]::placeholder {
  color: var(--color-text-secondary);
}

.search-form button {
  display: flex;
  align-items: center;
  color: var(--color-text-secondary);
}

.search-form button:hover {
  color: var(--color-text-primary);
}

.icon {
  width: 2rem;
  height: 2rem;
  stroke: currentColor;
  fill: none;
  flex-shrink: 0;
}

.user-icon-btn {
  display: flex;
  align-items: center;
  color: var(--color-text-secondary);
}

.site-footer {
  margin-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-4);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.site-footer .logo {
  font-size: var(--fs-md);
}

.footer-links {
  display: flex;
  gap: var(--space-3);
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
}

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

.footer-credit {
  font-size: var(--fs-xs);
  color: var(--color-text-secondary);
}

main {
  display: block;
  padding-block: var(--space-4);
  min-height: 60vh;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: var(--space-3);
}

@media (max-width: 600px) {
  .site-header .container {
    flex-direction: column;
    align-items: stretch;
  }

  .main-nav {
    justify-content: center;
  }

  .search-form {
    order: 3;
    width: 100%;
  }

  .search-form input[type="search"] {
    width: 100%;
  }
}