/* ==========================================================================
   Universal Header — pixel-match of the React / Tailwind homepage header
   Colours use the same HSL custom-property palette as the React app.
   ========================================================================== */

/* ---------- design-system tokens (same as React :root) ---------- */
:root {
  --background: 90 20% 98%;
  --foreground: 150 30% 12%;
  --primary: 152 45% 28%;
  --muted-foreground: 150 20% 32%;
  --secondary: 140 20% 90%;
  --border: 140 15% 85%;
  --leaf: 152 45% 28%;
  --leaf-foreground: 90 30% 98%;
  --gradient-nature: linear-gradient(135deg, hsl(152 45% 28%) 0%, hsl(145 40% 35%) 100%);
}

/* ---------- header shell ---------- */
.main-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid hsl(var(--border));
  background-color: hsl(var(--background) / .8);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.main-header .header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.main-header .header-row {
  display: flex;
  height: 64px;               /* h-16 = 4rem = 64px */
  align-items: center;
  justify-content: space-between;
}

/* ---------- logo ---------- */
.main-header .logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: inherit;
}

.main-header .logo:hover .logo-icon {
  transform: scale(1.05);
}

.main-header .logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 0.75rem;
  background: var(--gradient-nature);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform .2s;
}

.main-header .logo-icon svg {
  width: 20px;
  height: 20px;
  color: hsl(var(--leaf-foreground));
}

.main-header .logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
}

/* hide logo text on very small screens (sm:block) */
@media (max-width: 639px) {
  .main-header .logo-text { display: none; }
}

/* ---------- desktop nav ---------- */
.main-header .desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.main-header .desktop-nav a {
  font-size: 0.875rem;
  text-decoration: none;
  transition: color .15s;
  color: hsl(var(--muted-foreground));
}

.main-header .nav-dropdown {
  position: relative;
}

.main-header .nav-dropdown-toggle,
.main-header .mobile-nav-group-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: hsl(var(--muted-foreground));
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
}

.main-header .nav-dropdown-toggle:hover,
.main-header .nav-dropdown-toggle.active,
.main-header .mobile-nav-group-toggle:hover {
  color: hsl(var(--leaf));
}

.main-header .nav-dropdown-chevron {
  display: inline-flex;
  transition: transform .15s;
}

.main-header .nav-dropdown-toggle[aria-expanded="true"] .nav-dropdown-chevron,
.main-header .mobile-nav-group-toggle[aria-expanded="true"] .nav-dropdown-chevron {
  transform: rotate(180deg);
}

.main-header .nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.75rem);
  left: -0.75rem;
  z-index: 60;
  min-width: 11rem;
  padding: 0.375rem;
  border: 1px solid hsl(var(--border));
  border-radius: 0.25rem;
  background: hsl(var(--background));
  box-shadow: 0 8px 20px rgb(0 0 0 / 0.12);
}

.main-header .nav-dropdown-menu[hidden],
.main-header .mobile-nav-submenu[hidden] {
  display: none !important;
}

.main-header .nav-dropdown-menu a {
  display: block;
  padding: 0.625rem 0.75rem;
  border-radius: 0.2rem;
  white-space: nowrap;
}

.main-header .nav-dropdown-menu a:hover,
.main-header .nav-dropdown-menu a.active {
  background: hsl(var(--secondary) / .65);
  color: hsl(var(--leaf));
}

.main-header .nav-dropdown-toggle:focus-visible,
.main-header .nav-dropdown-menu a:focus-visible,
.main-header .mobile-nav-group-toggle:focus-visible,
.main-header .mobile-nav-submenu a:focus-visible {
  outline: 2px solid hsl(var(--primary));
  outline-offset: 3px;
}

.main-header .desktop-nav a:hover {
  color: hsl(var(--foreground));
}

.main-header .desktop-nav a.active {
  color: hsl(var(--leaf));
  font-weight: 500;
}

/* Solar Lab & FAQ get bolder treatment like the React app */
.main-header .desktop-nav a.nav-highlight {
  font-weight: 600;
  color: hsl(var(--primary));
}
.main-header .desktop-nav a.nav-highlight:hover {
  color: hsl(var(--leaf));
}
.main-header .desktop-nav a.nav-highlight.active {
  color: hsl(var(--leaf));
}

/* ---------- badge pills ---------- */
.main-header .nav-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  background-color: hsl(var(--secondary) / .5);
  padding: 0.375rem 0.75rem;
  border-radius: 9999px;
}

.main-header .nav-badge svg {
  width: 12px;
  height: 12px;
}

/* ---------- mobile toggle button ---------- */
.main-header .mobile-menu-toggle {
  display: none;              /* hidden on desktop */
  background: transparent;
  border: none;
  padding: 0;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: hsl(var(--foreground));
}

.main-header .mobile-menu-toggle svg {
  width: 20px;
  height: 20px;
}

/* ---------- mobile nav panel ---------- */
.main-header .mobile-nav {
  display: none;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem 0;
  overflow: hidden;
}

.main-header .mobile-nav a {
  font-size: 0.875rem;
  text-decoration: none;
  transition: color .15s;
  color: hsl(var(--muted-foreground));
}

.main-header .mobile-nav a:hover {
  color: hsl(var(--foreground));
}

.main-header .mobile-nav a.active {
  color: hsl(var(--leaf));
  font-weight: 500;
}

.main-header .mobile-nav a.nav-highlight {
  font-weight: 600;
  color: hsl(var(--primary));
}
.main-header .mobile-nav a.nav-highlight.active {
  color: hsl(var(--leaf));
}

.main-header .mobile-nav-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.main-header .mobile-nav-group-toggle {
  font-size: 0.875rem;
}

.main-header .mobile-nav-submenu {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-left: 0.5rem;
  padding-left: 0.875rem;
  border-left: 1px solid hsl(var(--border));
}

.main-header .mobile-nav-submenu a {
  font-size: 0.875rem;
}

.main-header .mobile-nav .badge-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.main-header .mobile-nav.open {
  display: flex;
}

@media (max-width: 1199px) {
  .main-header .desktop-nav { gap: 0.75rem; }
  .main-header .nav-badge { display: none; }
}

body[data-universal-header="true"] #root header.sticky.top-0.z-50 {
  display: none !important;
}

/* Keep the complete top-level menu usable on tablet and mobile widths. */
@media (max-width: 1023px) {
  .main-header .desktop-nav { display: none; }
  .main-header .mobile-menu-toggle { display: flex; }
}