/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 72px;
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.site-logo {
  flex-shrink: 0;
}

.logo-img {
  height: 56px;
  width: auto;
}

.nav-center {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-left: auto;
  flex-wrap: nowrap;
  flex-shrink: 1;
  min-width: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-muted);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-text) 5%, transparent);
}

.nav-link.active {
  color: var(--color-primary);
}

.nav-link-icon {
  font-size: 1.1rem;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* Nav dropdowns */
.nav-dropdown { position: relative; }

.nav-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-dropdown-trigger i {
  font-size: 0.7rem;
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-trigger i {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  right: 0;
  min-width: 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-sm);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
  transform: translateY(4px);
  z-index: 200;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  border-radius: var(--radius);
  transition: background var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.nav-dropdown-item:hover {
  background: var(--color-surface);
}

.nav-dropdown-icon {
  font-size: 1.1rem;
  color: var(--color-primary);
  flex-shrink: 0;
}

.nav-end {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-left: auto;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-sm);
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.theme-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  padding: 3px var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-btn:hover {
  color: var(--color-text);
  border-color: var(--color-text);
}

.theme-btn.active {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-primary);
}

/* Main container */
.container {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

main {
  min-height: calc(100vh - 200px);
}

.section {
  padding: var(--spacing-3xl) 0;
}

/* Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: var(--spacing-4xl) var(--spacing-lg) var(--spacing-2xl);
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-4xl);
}

.footer-logo-img {
  height: 36px;
  width: auto;
}

.footer-tagline {
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-muted);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.footer-col h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  letter-spacing: 0;
}

.footer-col a {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
  text-decoration: none;
}

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

.footer-bottom {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

/* Responsive */
@media (max-width: 1080px) {
  .nav-end { margin-left: auto; gap: var(--spacing-xs); }
  .nav-hamburger { display: flex; }
  .nav-center {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    gap: 0;
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    z-index: 100;
    margin-left: 0;
  }
  .nav-center.mobile-open { display: flex; }
  .nav-link {
    padding: var(--spacing-md) var(--spacing-sm);
    font-size: var(--font-size-base);
    border-radius: var(--radius);
    text-align: left;
  }

  /* Mobile dropdowns */
  .nav-dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    width: 100%;
    min-width: unset;
    padding: 0 0 0 var(--spacing-md);
    display: none;
    background: transparent;
  }
  .nav-dropdown.mobile-expanded .nav-dropdown-menu {
    display: flex;
    flex-direction: column;
  }
  /* Override hover on mobile */
  .nav-dropdown:hover .nav-dropdown-menu,
  .nav-dropdown:focus-within .nav-dropdown-menu {
    opacity: 0;
    visibility: hidden;
  }
  .nav-dropdown.mobile-expanded:hover .nav-dropdown-menu,
  .nav-dropdown.mobile-expanded:focus-within .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
  }
  .nav-dropdown-trigger i {
    transition: transform var(--transition-fast);
  }
  .nav-dropdown.mobile-expanded .nav-dropdown-trigger i {
    transform: rotate(180deg);
  }
  .nav-dropdown-item {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .footer-content { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: repeat(2, 1fr); }
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-2xl); }
}

@media (max-width: 600px) {
  .footer-links { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--spacing-md); text-align: center; }
}

@media (max-width: 480px) {
  h1 { font-size: var(--font-size-3xl); }
  .section { padding: var(--spacing-2xl) 0; }
}