/**
 * assets/css/nav.css
 * Purpose: Site header, wordmark, desktop nav, hamburger, mobile drawer.
 * Split from layout.css to keep files under 200 lines.
 * Depends on: base.css (CSS variables).
 * Last modified: 2026-04-11
 */

/* ─── Site header ───────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(120%);
  -webkit-backdrop-filter: blur(20px) saturate(120%);
  border-bottom: 1px solid var(--border);
  height: 64px;
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ─── Wordmark ──────────────────────────────────────────────────────────────── */
.wordmark {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
}
.wordmark:hover {
  color: var(--text);
  text-decoration: none;
}
.wordmark svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* ─── Desktop nav ───────────────────────────────────────────────────────────── */
.site-nav {
  display: none;
}
.site-nav a {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
}
.site-nav a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
  text-decoration: none;
}

/* ─── Hamburger button ──────────────────────────────────────────────────────── */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-dim);
  border-radius: 2px;
  transition: background var(--t-fast);
}
.nav-toggle:hover span {
  background: var(--text);
}

/* ─── Mobile drawer ─────────────────────────────────────────────────────────── */
.mobile-nav {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--bg-elev-1);
  border-bottom: 1px solid var(--border);
  padding: var(--space-4) var(--space-5);
  z-index: 99;
  flex-direction: column;
  gap: var(--space-2);
}
.mobile-nav.open {
  display: flex;
}
.mobile-nav a {
  color: var(--text-dim);
  font-size: 1rem;
  font-weight: 500;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
}
.mobile-nav a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
  text-decoration: none;
}

@media (min-width: 768px) {
  .site-nav   { display: flex; align-items: center; gap: var(--space-1); }
  .nav-toggle { display: none; }
}

/* ─── Site version badge ─────────────────────────────────────────────────────── */
.site-version-badge {
  font-size: 10px;
  color: rgba(255, 255, 255, 0.25);
  font-family: monospace;
  letter-spacing: 0.04em;
  margin-left: 4px;
  user-select: none;
}