:root {
  --sidebar-w: 240px;
  --brand: #2563eb;
  --bg: #f4f6fb;
  --ink: #1f2937;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }

.app-shell { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  background: #0f172a;
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 40;
}
.sidebar-brand {
  padding: 18px 20px;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar-brand i { color: var(--brand); }
.sidebar-nav { padding: 12px 8px; display: flex; flex-direction: column; gap: 2px; }
.sidebar-nav .nav-link {
  color: #cbd5e1; border-radius: 8px; padding: 10px 12px; font-size: .93rem;
  display: flex; align-items: center; gap: 10px;
}
.sidebar-nav .nav-link:hover { background: rgba(255,255,255,.06); color: #fff; }
.sidebar-nav .nav-link.active { background: var(--brand); color: #fff; }

/* Main */
.main { flex: 1; margin-left: var(--sidebar-w); display: flex; flex-direction: column; }
.topbar {
  background: #fff; height: 60px; display: flex; align-items: center;
  gap: 16px; padding: 0 24px; border-bottom: 1px solid #e5e7eb; position: sticky; top: 0; z-index: 30;
}
.topbar-title { font-weight: 600; }
.topbar-user { margin-left: auto; }
.content { padding: 24px; }

/* Stat cards */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: #fff; border-radius: 12px; padding: 18px 20px; box-shadow: 0 1px 3px rgba(0,0,0,.06); }
.stat-card .label { color: #6b7280; font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
.stat-card .value { font-size: 1.8rem; font-weight: 700; margin-top: 4px; }
.stat-card.green .value { color: #16a34a; }
.stat-card.red .value { color: #dc2626; }
.stat-card.blue .value { color: var(--brand); }
.stat-card.yellow .value { color: #d97706; }

.card { border: none; border-radius: 12px; box-shadow: 0 1px 3px rgba(0,0,0,.06); }
.table { margin-bottom: 0; }
.badge-green { background: #dcfce7; color: #16a34a; }
.badge-yellow { background: #fef9c3; color: #a16207; }
.badge-red { background: #fee2e2; color: #dc2626; }
.badge-blue { background: #dbeafe; color: #2563eb; }

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
}

/* Auth */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg,#0f172a,#1e3a8a); }
.auth-card { background: #fff; border-radius: 16px; padding: 36px; width: 100%; max-width: 400px; box-shadow: 0 20px 40px rgba(0,0,0,.2); }
.auth-card h1 { font-size: 1.4rem; margin-bottom: 4px; }
.auth-card .sub { color: #6b7280; font-size: .9rem; margin-bottom: 24px; }