/* ════════════════════════════════════════════════════════════════════════
   SINGLE SOURCE OF TRUTH for the site header (nav bar).
   The markup is rendered by assets/site-nav.js into <nav class="site-header">;
   this file is the ONLY place its styling lives. Every page links it, so the
   header can never drift between pages again.

   Self-contained: uses each page's own theme variables with fallbacks for the
   two naming schemes in this codebase (main pages --text/--border/--bg-nav…,
   legal pages --fg/--line/--card…), so it adapts to light/dark on every page
   without depending on which vars that page happens to define.
   Requires the brand font via /assets/fonts.css (Fraunces) on each page.
   ════════════════════════════════════════════════════════════════════════ */

nav.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: 60px;
  z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  /* Pin the text-metrics the header inherits, so the brand/menu are identical on
     every page regardless of that page's body styles (blog's prose set a different
     line-height AND letter-spacing, which shifted the menu vertically + spread the
     items). The brand re-sets its own letter-spacing below. */
  line-height: 1.4;
  letter-spacing: normal;
  word-spacing: normal;
  padding: 0 clamp(16px, 4vw, 48px);
  background: var(--bg-nav, var(--card, var(--bg, #FAFAF8)));
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  backdrop-filter: blur(24px) saturate(1.8);
  border-bottom: 1px solid var(--border, var(--line, rgba(0,0,0,.08)));
  box-sizing: border-box;
}

.site-header .nav-left { display: flex; align-items: center; gap: 10px; min-width: 0; }
.site-header .nav-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

/* Brand */
.site-header .nav-brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--text, var(--fg, #16130F)); flex-shrink: 0; }
.site-header .nav-brand img { width: 28px; height: 28px; display: block; }
.site-header .nav-brand-text {
  font-family: 'Fraunces', 'Playfair Display', Georgia, serif;
  font-size: 1.15rem; font-weight: 400; font-style: normal;
  font-variation-settings: 'opsz' 40;
  text-transform: lowercase; letter-spacing: -0.5px;
}

/* Menu */
.site-header .nav-links { display: flex; gap: 2px; margin-left: 8px; list-style: none; min-width: 0; }
.site-header .nav-links a {
  color: var(--text-secondary, var(--muted, #6B6256)); text-decoration: none;
  font-size: 0.82rem; font-weight: 500;
  padding: 6px 12px; border-radius: 999px;
  transition: color .25s, background .25s; white-space: nowrap;
}
.site-header .nav-links a:hover { color: var(--text, var(--fg, #16130F)); background: rgba(247,147,26,.08); }
.site-header .nav-links a.active { color: var(--orange, #F7931A); background: rgba(247,147,26,.10); }

/* Theme toggle */
.site-header .theme-toggle {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--border, var(--line, rgba(0,0,0,.12)));
  background: var(--bg-elevated, var(--card, #fff));
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; position: relative; overflow: hidden; flex-shrink: 0;
  transition: border-color .2s;
}
.site-header .theme-toggle:hover { border-color: var(--orange, #F7931A); }
.site-header .icon-sun, .site-header .icon-moon { position: absolute; transition: transform .4s cubic-bezier(.16,1,.3,1), opacity .4s; }
[data-theme="dark"] .site-header .icon-sun { transform: rotate(90deg) scale(0); opacity: 0; }
[data-theme="dark"] .site-header .icon-moon { transform: rotate(0) scale(1); opacity: 1; }
[data-theme="light"] .site-header .icon-sun { transform: rotate(0) scale(1); opacity: 1; }
[data-theme="light"] .site-header .icon-moon { transform: rotate(-90deg) scale(0); opacity: 0; }

/* Mobile burger */
.site-header .nav-burger {
  display: none; width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--border, var(--line, rgba(0,0,0,.12)));
  background: var(--bg-elevated, var(--card, #fff));
  cursor: pointer; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; padding: 0; flex: 0 0 auto;
}
.site-header .nav-burger span { display: block; width: 18px; height: 2px; background: var(--text, var(--fg, #16130F)); border-radius: 2px; transition: transform .25s, opacity .2s; }
.site-header .nav-burger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header .nav-burger.open span:nth-child(2) { opacity: 0; }
.site-header .nav-burger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 768px) and (orientation: portrait) {
  .site-header .nav-burger { display: flex; }
  nav.site-header .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 2px !important; align-items: stretch;
    background: var(--bg-elevated, var(--card, #fff));
    border-top: 1px solid var(--border, var(--line, rgba(0,0,0,.12)));
    border-bottom: 1px solid var(--border, var(--line, rgba(0,0,0,.12)));
    padding: 8px 14px; margin: 0 !important; display: none !important;
    box-shadow: 0 14px 34px rgba(0,0,0,.22); z-index: 60;
  }
  nav.site-header .nav-links.open { display: flex !important; }
  nav.site-header .nav-links a { font-size: .98rem !important; padding: 12px 12px !important; }
}