/* app/assets/stylesheets/components/nav.css
   ─────────────────────────────────────────────────────────────────────────────
   Masthead (top bar) and navigation for admin layout.
   ───────────────────────────────────────────────────────────────────────────── */

/* ── Masthead ─────────────────────────────────────────────────────────────── */

.masthead {
  position:         sticky;
  top:              0;
  z-index:          var(--z-masthead);
  background:       var(--color-black);
  border-bottom:    3px solid var(--color-blue-600);
  height:           var(--masthead-height);
  display:          flex;
  align-items:      center;
}

.masthead__inner {
  width:          100%;
  max-width:      var(--max-width-content);
  margin:         0 auto;
  padding:        0 var(--space-6);
  display:        flex;
  align-items:    center;
  gap:            var(--space-8);
}

/* Brand / wordmark */
.masthead__brand {
  display:     flex;
  align-items: baseline;
  gap:         var(--space-2);
  flex-shrink: 0;
}

.masthead__wordmark {
  font-family:    var(--font-serif);
  font-size:      var(--text-lg);
  font-weight:    700;
  color:          var(--color-white);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
  white-space:    nowrap;
}

.masthead__wordmark:hover {
  color: var(--color-blue-200);
}

.masthead__edition {
  font-family:    var(--font-sans);
  font-size:      var(--text-xs);
  font-weight:    600;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color:          var(--color-blue-500);
  padding:        2px 6px;
  border:         1px solid var(--color-blue-600);
  border-radius:  var(--radius-sm);
  line-height:    1;
}

/* Nav links */
.masthead__nav {
  display:     flex;
  align-items: center;
  gap:         var(--space-1);
  flex:        1;
}

.masthead__nav-link {
  font-family:    var(--font-sans);
  font-size:      var(--text-sm);
  font-weight:    500;
  color:          var(--color-gray-400);
  text-decoration: none;
  padding:        var(--space-2) var(--space-3);
  border-radius:  var(--radius-md);
  transition:     color var(--transition-fast),
                  background var(--transition-fast);
  white-space:    nowrap;
}

.masthead__nav-link:hover {
  color:      var(--color-white);
  background: rgba(255,255,255,0.08);
}

.masthead__nav-link.is-active {
  color:      var(--color-white);
  background: rgba(255,255,255,0.12);
  font-weight: 600;
}

/* Right-side admin actions */
.masthead__actions {
  display:     flex;
  align-items: center;
  gap:         var(--space-4);
  flex-shrink: 0;
}

.masthead__admin-name {
  font-family: var(--font-sans);
  font-size:   var(--text-sm);
  color:       var(--color-gray-400);
  white-space: nowrap;
  max-width:   160px;
  overflow:    hidden;
  text-overflow: ellipsis;
}

/* ── Tab strip (dashboard section navigation) ────────────────────────────── */

.tab-strip {
  display:       flex;
  align-items:   flex-end;
  gap:           0;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: var(--space-6);
  overflow-x:    auto;
}

.tab-strip__tab {
  font-family:    var(--font-sans);
  font-size:      var(--text-sm);
  font-weight:    500;
  color:          var(--text-secondary);
  text-decoration: none;
  padding:        var(--space-3) var(--space-5);
  border-bottom:  2px solid transparent;
  margin-bottom:  -2px;
  white-space:    nowrap;
  transition:     color var(--transition-fast),
                  border-color var(--transition-fast);
}

.tab-strip__tab:hover {
  color:        var(--text-primary);
  border-color: var(--border-strong);
}

.tab-strip__tab.is-active {
  color:        var(--color-blue-600);
  border-color: var(--color-blue-600);
  font-weight:  600;
}

/* ── Admin body layout ───────────────────────────────────────────────────── */

.admin-body {
  background: var(--bg-page);
  min-height: 100dvh;
  display:    flex;
  flex-direction: column;
}

.admin-main {
  flex:       1;
  width:      100%;
  max-width:  var(--max-width-content);
  margin:     0 auto;
  padding:    var(--space-8) var(--space-6);
}

/* ── Admin footer ────────────────────────────────────────────────────────── */

.admin-footer {
  border-top:  1px solid var(--border-color);
  background:  var(--bg-surface);
  padding:     var(--space-4) var(--space-6);
  margin-top:  auto;
}

.admin-footer__inner {
  max-width:   var(--max-width-content);
  margin:      0 auto;
  display:     flex;
  align-items: center;
  justify-content: space-between;
  font-size:   var(--text-xs);
  color:       var(--text-muted);
}

/* ── Responsive masthead ─────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .masthead__nav {
    display: none;  /* collapses — mobile nav handled separately in phase 4 */
  }

  .masthead__admin-name {
    display: none;
  }

  .admin-main {
    padding: var(--space-4);
  }
}

/* Placeholder nav items for routes not yet built (Phase 3+) */
.masthead__nav-link--soon {
  opacity: 0.35;
  cursor:  default;
  pointer-events: none;
}