/* ==========================================================================
   Navbar — transparent, sticky, blurs on scroll
   ========================================================================== */

.site-navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  background-color: rgba(248, 250, 252, 0);
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}

.site-navbar.is-scrolled {
  background-color: rgba(248, 250, 252, 0.75);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}

:root[data-theme="dark"] .site-navbar.is-scrolled {
  background-color: rgba(11, 18, 32, 0.75);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 24px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--color-primary), #1E40AF);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: -0.03em;
  flex-shrink: 0;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}

.brand-text-primary {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--color-text);
  line-height: 1.2;
}

.brand-text-secondary {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.navbar-nav-custom {
  align-items: center;
  gap: 4px;
}

@media (min-width: 992px) {
  .navbar-nav-custom.collapse {
    display: flex !important;
  }
}

.nav-link-custom {
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link-custom:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.nav-link-custom.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  font-size: 1.05rem;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease;
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  border-color: var(--color-primary);
  transform: rotate(15deg);
}

.navbar-toggler-custom {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  width: 44px;
  height: 44px;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--color-white);
  color: var(--color-text);
  font-size: 1.2rem;
}

@media (max-width: 991px) {
  .navbar-nav-custom {
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    padding: 12px;
    gap: 4px;
  }

  .navbar-nav-custom.collapse.show {
    display: flex !important;
  }

  .nav-link-custom {
    padding: 12px 16px;
  }

  .navbar-toggler-custom {
    display: flex;
  }
}

@media (max-width: 420px) {
  .brand-mark { width: 38px; height: 38px; font-size: 0.82rem; border-radius: 11px; }
  .brand-text-primary { font-size: 0.92rem; }
  .brand-text-secondary { font-size: 0.68rem; }
  .navbar-actions { gap: 8px; }
  .theme-toggle-btn, .navbar-toggler-custom { width: 38px; height: 38px; font-size: 0.95rem; }
}

@media (max-width: 340px) {
  .brand-text-secondary { display: none !important; }
}