/* === Navigation Bar - White Theme (3X-UI Style) === */
:root {
  --nav-height: 56px;
  --accent: #008771;
  --accent-light: #dbf5ed;
}
* { margin: 0; padding: 0; box-sizing: border-box; }

.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: #fff;
  border-bottom: 1px solid #f0f0f0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.site-nav .nav-brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: #1a1a1a;
  font-size: 18px; font-weight: 700; letter-spacing: 0.5px;
}
.site-nav .nav-brand .brand-icon {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, #009980, #006655);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.site-nav .nav-tabs {
  display: flex; align-items: center; gap: 4px; list-style: none;
}
.site-nav .nav-tabs a {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 20px; border-radius: 10px;
  text-decoration: none; color: rgba(0,0,0,0.45);
  font-size: 14px; font-weight: 500;
  transition: all 0.2s ease; position: relative;
}
.site-nav .nav-tabs a:hover {
  color: rgba(0,0,0,0.75);
  background: rgba(0,135,113,0.06);
}
.site-nav .nav-tabs a.active {
  color: var(--accent);
  background: rgba(0,135,113,0.08);
}
.site-nav .nav-tabs a.active::after {
  content: '';
  position: absolute; bottom: -1px; left: 50%; transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--accent); border-radius: 1px;
}
.site-nav .nav-tabs svg { width: 16px; height: 16px; opacity: 0.7; }
body.has-nav { padding-top: var(--nav-height) !important; }