:root {
  --color-header-background: var(--color-primary);
  --color-header-title: #f1f1f1;
  --color-nav-link: #CFD8DC;
}

header {
    position: sticky;
    top: 0;
    z-index: 1000;           /* sit above other content */
  background-color: var(--color-header-background);
  color: var(--color-header-title);
  padding: var(--spacing-md);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center; /* fallback for older browsers */
}

.header-bar {
  display: flex;
  justify-content: center;
  align-items: center;
	flex-direction: column;
  background-color: var(--color-header-background);
  position: relative;
  z-index: 1000;
}


/* Site title */
.header-title {
  flex: 1;
  text-align: left;
}

.header-title h1 a {
  color: var(--color-header-title);
  text-decoration: none;
}

header h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  /* bump contrast: ensure white text on dark background */
  color: var(--color-bg);
  margin-bottom: var(--spacing-sm);
}

header h1 a {
	color: var(--color-header-title);
}

nav {
  margin-top: var(--spacing-sm);
}

/* Nav toggle button */
.nav-toggle {
  display: none;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: var(--color-header-title);
  cursor: pointer;
  padding: var(--spacing-sm);
  margin-left: auto;
  flex-shrink: 0;
}

/* Default nav (desktop) */
.navbar {
  display: flex;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}


nav ul li {
  margin: 0 var(--spacing-md);
}

nav ul li a {
  color: var(--color-nav-link);
  text-decoration: none;
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  transition: background-color 0.2s;
}


.navbar li a:hover,
.navbar li a.active {
  background-color: rgba(236, 240, 241, 0.2);
}

/* Hide nav on mobile unless toggled */
@media (max-width: 768px) {

	header h1 {
	  font-size: 1.3rem;
	}
	
	nav {
		margin-top: 0;
	}
	
	.header-bar {
	  display: flex;
		flex-direction: row;
	  justify-content: space-between;
	  align-items: center;
		width: 100%;
	  padding: var(--spacing-sm) var(--spacing-md);
	  background-color: var(--color-header-background);
	  position: relative;
	  z-index: 1000;
	}
	
	.header-title {
	  flex: 1 1 auto;
	  overflow: hidden;
	  white-space: nowrap;
	  text-overflow: ellipsis;
	}
	
  .navbar {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.3s ease-out, opacity 0.2s ease-out;
    position: absolute;
    top: 60px;
    right: 0;
    width: 100%;
    background-color: var(--color-primary);
    flex-direction: column;
    align-items: flex-end;
    padding: 0 1rem;
    box-sizing: border-box;
    z-index: 1000;
  }

  .navbar.open {
    max-height: 500px; /* large enough to show all items */
    opacity: 1;
    padding: 0.5rem 1rem; /* restore padding when open */
  }
	

  .navbar.open {
    display: flex;
  }

  .nav-list {
		display: flex;
    flex-direction: column;
    width: 100%;
		align-items: flex-end;
		text-align: right;
		padding: 0;
		margin: 0;
  }

  .nav-list li {
		list-style: none;
    margin: 0;
		padding: 0;
		line-height: 1.1;
		width: 100%;
  }

  .nav-list li a {
    text-align: right;
    display: block;
    width: 100%;
		font-size: 0.95rem; 
		padding: 0.25rem 0.75rem;
		box-sizing: border-box;
		overflow-wrap: anywhere; /* avoids long words pushing out */
		margin: 0;
		line-height: 1.1;
  }

  .nav-toggle {
    display: block;
	  position: absolute;
	  right: var(--spacing-md);
	  top: 50%;
	  transform: translateY(-50%);
	  font-size: 1.5rem;
	  background: none;
	  border: none;
		color: var(--color-nav-link);
	  cursor: pointer;
	  z-index: 1001;
	}
}