:root {
  /* Primary Blues */
  --primary-900: #1e40af;
  --primary-700: #1d4ed8;
  --primary-600: #2563eb;
  --primary-500: #3b82f6;
  --primary-300: #60a5fa;
  --primary-100: #dbeafe;

  /* Neutrals */
  --neutral-900: #111827;
  --neutral-800: #1f2937;
  --neutral-700: #374151;
  --neutral-600: #4b5563;
  --neutral-500: #6b7280;
  --neutral-400: #9ca3af;
  --neutral-300: #d1d5db;
  --neutral-200: #e5e7eb;
  --neutral-100: #f3f4f6;

  /* Accents */
  --accent-50: #fefefe;
  --accent-100: #fafafa;
  --accent-200: #f5f5f5;
  --accent-300: #e5e5e5;

  /* Typography & Spacing */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: linear-gradient(180deg, var(--neutral-900), var(--neutral-800));
  color: var(--neutral-100);
  font: 15px/1.5 var(--font-family-primary);
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: 64px 1fr;
  grid-template-areas: 'header header' 'sidebar main';
  min-height: 100vh;
}

header {
  grid-area: header;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--spacing-xl);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  background: rgba(17,24,39,0.6);
  backdrop-filter: blur(8px);
}
header h1 { font-size: 18px; letter-spacing: .3px; color: var(--primary-100); margin: 0; }

.sidebar {
  grid-area: sidebar;
  border-right: 1px solid rgba(255,255,255,0.08);
  padding: var(--spacing-lg);
}
.sidebar .section-title { color: var(--neutral-300); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; margin: var(--spacing-md) 0 var(--spacing-sm); }
.sidebar a { display: block; padding: 8px 10px; color: var(--neutral-200); text-decoration: none; border-radius: 8px; transition: all .2s ease; }
.sidebar a:hover { background: rgba(255,255,255,0.06); color: #fff; transform: translateX(2px); }

main {
  grid-area: main;
  padding: var(--spacing-xl);
}

.grid {
  display: grid; gap: var(--spacing-lg);
}
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 1200px) { .grid.cols-3 { grid-template-columns: repeat(2, 1fr);} }
@media (max-width: 800px) { .layout { grid-template-columns: 1fr; grid-template-rows: 64px auto; grid-template-areas: 'header' 'main'; } .sidebar { display:none; } .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; } }

.card {
  background: radial-gradient(1200px 300px at top right, rgba(59,130,246,0.08), transparent 40%), var(--accent-50);
  color: var(--neutral-900);
  border: 1px solid var(--neutral-200);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: var(--spacing-lg);
  transition: all 0.2s ease;
}
.card:hover { box-shadow: 0 10px 24px rgba(0, 0, 0, 0.15); transform: translateY(-2px); }
.card h3 { margin: 0 0 var(--spacing-md); color: var(--primary-900); font-size: 16px; }
.muted { color: var(--neutral-600); font-size: 12px; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  color: white; border: none; border-radius: 8px; cursor: pointer;
  padding: var(--spacing-md) var(--spacing-lg); font-weight: 600;
  transition: all .2s ease; box-shadow: 0 1px 2px rgba(59,130,246,.3);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--primary-700), var(--primary-600)); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(59,130,246,0.4); }
.btn-secondary { background: rgba(17,24,39,.65); color:#fff; border:1px solid rgba(255,255,255,.08); border-radius: 8px; padding: 8px 12px; }

.status-dot { width:10px; height:10px; border-radius:50%; display:inline-block; margin-right:8px; }
.ok { background: #16a34a; }
.warn { background: #f59e0b; }
.err { background: #ef4444; }

.row { display:flex; gap: var(--spacing-sm); align-items:center; }
.stack { display:flex; flex-direction: column; gap: var(--spacing-sm); }
.kpi { font-size: 28px; font-weight: 700; color: var(--neutral-900); }
.kpi-sub { font-size: 12px; color: var(--neutral-500); }

.table { width:100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--neutral-200); text-align: left; }
.table th { color: var(--neutral-600); font-weight: 600; }
.table tr:hover td { background: var(--accent-100); }

.pill { padding: 4px 8px; background: var(--primary-100); color: var(--primary-700); border-radius: 999px; font-size: 11px; }

.section-title {
  color: var(--neutral-300);
  text-transform: uppercase; letter-spacing: .12em; font-size: 12px;
  margin: var(--spacing-xl) 0 var(--spacing-sm);
}

.notice { color: var(--neutral-400); font-size: 12px; }

/* Skeleton loaders */
.skeleton { position: relative; overflow: hidden; background: var(--neutral-200); border-radius: 6px; min-height: 12px; }
.skeleton::after { content: ""; position: absolute; inset: 0; transform: translateX(-100%); background: linear-gradient(90deg, transparent, rgba(255,255,255,.4), transparent); animation: shimmer 1.5s infinite; }
@keyframes shimmer { 100% { transform: translateX(100%); } }

/* Toast notifications */
.toast { position: fixed; right: 16px; bottom: 16px; background: #0b1220; color: #fff; border: 1px solid #1f2937; border-radius: 10px; padding: 12px 14px; box-shadow: 0 6px 20px rgba(0,0,0,.25); opacity: 0; transform: translateY(10px); transition: all .25s ease; z-index: 9999; }
.toast.show { opacity: 1; transform: translateY(0); }
.toast.ok { border-color: #15803d; }
.toast.err { border-color: #b91c1c; }
.toast.warn { border-color: #b45309; }

/* Accessibility focus */
a:focus, button:focus { outline: 2px solid var(--primary-500); outline-offset: 2px; }

/* Authentication Overlay */
.auth-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--neutral-900), var(--neutral-800));
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

.auth-modal {
  background: var(--accent-50);
  color: var(--neutral-900);
  padding: var(--spacing-3xl);
  border-radius: 16px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
  text-align: center;
  max-width: 500px;
  width: 90%;
}

.auth-modal h2 {
  color: var(--primary-900);
  margin: 0 0 var(--spacing-lg);
  font-size: 24px;
}

.auth-modal p {
  color: var(--neutral-600);
  margin: 0 0 var(--spacing-xl);
  line-height: 1.6;
}

.auth-modal .btn-primary {
  font-size: 16px;
  padding: var(--spacing-lg) var(--spacing-2xl);
}

.auth-note {
  margin-top: var(--spacing-lg);
  color: var(--neutral-500);
}