:root {
  --bg: #f5f5f5;
  --text: #111827;

  --header-bg: #111827;
  --header-border: #dddddd;

  --nav-btn-bg: #1f2937;
  --nav-btn-text: #e5e7eb;
  --nav-btn-border: #374151;

  --nav-btn-hover-bg: #2563eb;
  --nav-btn-hover-border: #2563eb;

  --focus-outline: #93c5fd;
}
:root.dark {
  --bg: #020617;
  --text: #e5e7eb;

  --header-bg: #020617;
  --header-border: #1f2937;

  --nav-btn-bg: #111827;
  --nav-btn-text: #e5e7eb;
  --nav-btn-border: #374151;

  --nav-btn-hover-bg: #2563eb;
  --nav-btn-hover-border: #2563eb;

  --focus-outline: #93c5fd;
}
/* style */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
}

header {
  padding: 1rem;
  border-bottom: 1px solid var(--header-border);
  background: var(--header-bg);
}

/* Layout nav */
.nav {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* menu buttons */
.nav-btn,
.primary-btn {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--nav-btn-border);
  background: var(--nav-btn-bg);
  color: var(--nav-btn-text);
  font-size: 0.95rem;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.nav-btn:hover,
.primary-btn:hover {
  background: var(--nav-btn-hover-bg);
  border-color: var(--nav-btn-hover-border);
  transform: translateY(-1px);
}

.nav-btn:hover,
.primary-btn:hover {
  background: var(--nav-btn-hover-bg);
  border-color: var(--nav-btn-hover-border);
  transform: translateY(-1px);
}

/* Lyspære */
#theme-toggle {
  padding-inline: 10px;
  font-size: 1.2rem; 
}

.nav-btn:focus-visible,
.primary-btn:focus-visible {
  outline: 2px solid var(--focus-outline);
  outline-offset: 2px;
}



main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}