*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:       #2563a8;
  --primary-dark:  #1a3558;
  --primary-light: #eff6ff;
  --success:       #16a34a;
  --danger:        #dc2626;
  --warning:       #d97706;
  --gray-50:       #f9fafb;
  --gray-100:      #f3f4f6;
  --gray-200:      #e5e7eb;
  --gray-400:      #9ca3af;
  --gray-500:      #6b7280;
  --gray-700:      #374151;
  --gray-900:      #111827;
  --radius-sm:     6px;
  --radius-md:     10px;
  --radius-lg:     14px;
  --shadow-sm:     0 1px 4px rgba(0,0,0,.08);
  --shadow-md:     0 4px 16px rgba(0,0,0,.12);
  --shadow-lg:     0 12px 40px rgba(0,0,0,.18);
  --sidebar-w:     250px;
  --topbar-h:      58px;
  --transition:    .18s ease;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray-700);
  background: #f0f2f5;
  min-height: 100vh;
}

.hidden { display: none !important; }

a { color: var(--primary); text-decoration: none; }
b, strong { font-weight: 600; }
code { font-family: 'Courier New', monospace; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-200); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.page-loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.88);
}

.page-loading-overlay .plo-card {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.2rem;
  border-radius: 16px;
  background: rgba(255,255,255,0.95);
  box-shadow: var(--shadow-lg);
  color: var(--gray-700);
  font-weight: 700;
}

.page-loading-overlay .plo-spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(37,99,184,0.2);
  border-top-color: var(--primary);
  border-radius: 999px;
  animation: spin .8s linear infinite;
}