html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

#home,
#extensions,
#apps,
#tools,
#about {
  scroll-margin-top: 5rem;
}

.site-header-v1 {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(234, 88, 12, 0.14);
  background: rgba(255, 247, 237, 0.86);
  backdrop-filter: blur(16px) saturate(135%);
  -webkit-backdrop-filter: blur(16px) saturate(135%);
  transition: background-color 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.site-header-v1.is-scrolled {
  border-bottom-color: rgba(234, 88, 12, 0.2);
  background: rgba(255, 251, 247, 0.94);
  box-shadow: 0 8px 24px rgba(154, 52, 18, 0.08);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav-v1 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  transition: padding 200ms ease;
}

.site-header-v1.is-scrolled .nav-v1 {
  padding-top: 0.65rem;
  padding-bottom: 0.65rem;
}

.nav-links-v1 {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links-v1 a {
  border-radius: 0.625rem;
  padding: 0.5rem 0.625rem;
  color: #57534e;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 160ms ease, color 160ms ease;
}

.nav-links-v1 a:hover {
  background: rgba(255, 237, 213, 0.75);
  color: #c2410c;
  text-decoration: none;
}

.nav-links-v1 a.is-active {
  background: #ffedd5;
  color: #9a3412;
  font-weight: 600;
}

.nav-links-v1 a:focus-visible,
.mobile-nav-link-v1:focus-visible,
.logo-v1:focus-visible,
.nav-mobile-toggle:focus-visible,
.lang-switcher-btn:focus-visible {
  outline: 3px solid rgba(251, 146, 60, 0.65);
  outline-offset: 3px;
}

.logo-v1 {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  border-radius: 0.625rem;
  color: #1f2937;
  text-decoration: none;
}

.logo-v1 img {
  transition: width 200ms ease, height 200ms ease;
}

.site-header-v1.is-scrolled .logo-v1 img {
  width: 1.75rem;
  height: 1.75rem;
}

.logo-text {
  color: #1f2937;
  font-size: 1.25rem;
  font-weight: 700;
  transition: color 160ms ease;
}

.logo-v1:hover .logo-text {
  color: #9a3412;
}

.nav-mobile-toggle {
  display: none;
  width: 2.375rem;
  height: 2.375rem;
  align-items: center;
  justify-content: center;
  border: 1px solid #fed7aa;
  border-radius: 0.75rem;
  background: rgba(255, 253, 250, 0.72);
  color: #9a3412;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease;
}

.nav-mobile-toggle:hover {
  border-color: #fdba74;
  background: #ffedd5;
}

.mobile-nav-v1 {
  display: none;
}

.dropdown { position: relative; display: inline-block; }
.dropdown-end .lang-dropdown-menu { right: 0; left: auto; }
.lang-switcher-btn {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  min-height: 2.375rem;
  padding: 0.375rem 0.5rem;
  border: 1px solid #fed7aa;
  border-radius: 0.75rem;
  background: rgba(255, 253, 250, 0.72);
  color: #44403c;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 2px rgba(154, 52, 18, 0.04);
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.lang-switcher-btn:hover {
  border-color: #fdba74;
  background: #ffedd5;
  box-shadow: 0 3px 8px rgba(154, 52, 18, 0.08);
}
.dropdown:focus .lang-switcher-btn .chevron-down,
.dropdown:focus-within .lang-switcher-btn .chevron-down { transform: rotate(180deg); }
.lang-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 100;
  display: block;
  min-width: 8rem;
  margin-top: 0.5rem;
  padding: 0.5rem;
  border: 1px solid #ffedd5;
  border-radius: 0.75rem;
  background: #fffaf5;
  box-shadow: 0 10px 25px rgba(154, 52, 18, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 160ms ease, visibility 160ms ease, transform 160ms ease;
}
.dropdown:focus-within .lang-dropdown-menu,
.dropdown:hover .lang-dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-dropdown-menu li { list-style: none; margin: 0; padding: 0; }
.lang-option {
  display: flex;
  width: 100%;
  box-sizing: border-box;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.75rem;
  border-radius: 0.5rem;
  color: #44403c;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease;
}
.lang-option:hover,
.lang-option.active { background: #ffedd5; color: #9a3412; }
.lang-option.active { font-weight: 600; }
.lang-flag { font-size: 1rem; line-height: 1; }
.lang-text { flex: 1; }

@keyframes mobile-nav-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .nav-links-v1 { display: none; }
  .nav-mobile-toggle { display: inline-flex; }

  .mobile-nav-v1 {
    display: grid;
    gap: 0.25rem;
    padding: 0.75rem 1.5rem 1rem;
    border-top: 1px solid rgba(234, 88, 12, 0.12);
    background: rgba(255, 250, 245, 0.96);
    animation: mobile-nav-in 160ms ease-out;
  }

  .mobile-nav-link-v1 {
    border-radius: 0.625rem;
    padding: 0.75rem 1rem;
    color: #57534e;
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
  }

  .mobile-nav-link-v1:hover,
  .mobile-nav-link-v1.is-active {
    background: #ffedd5;
    color: #9a3412;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  .mobile-nav-v1 { padding-inline: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .site-header-v1,
  .nav-v1,
  .logo-v1 img,
  .nav-links-v1 a,
  .nav-mobile-toggle,
  .lang-switcher-btn,
  .lang-dropdown-menu {
    transition: none;
  }

  .mobile-nav-v1 { animation: none; }
}