*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0 }
:root { --bg: #0b1020; --card: #151b31; --border: #1e2a4a; --text: #c8d6e5; --heading: #f0f4f8; --accent: #3b82f6; --green: #34d399; --muted: #8899b4 }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; -webkit-font-smoothing: antialiased }
a { color: var(--accent); text-decoration: none }
a:hover { color: #60a5fa }

/* Topbar */
.topbar { background: var(--card); border-bottom: 1px solid var(--border); padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 10 }
.topbar .logo { font-size: 18px; font-weight: 700; color: var(--heading) }
.topbar .logo span { color: var(--accent) }
.topbar nav { display: flex; gap: 20px; align-items: center; font-size: 14px }
.topbar nav a { color: var(--muted) }
.topbar nav a:hover, .topbar nav a.active { color: var(--heading) }
.topbar nav a.active { border-bottom: 2px solid var(--accent); padding-bottom: 2px }
.btn-logout { background: none; border: 1px solid var(--border); color: var(--muted); padding: 6px 14px; border-radius: 6px; cursor: pointer; font-size: 13px }
.btn-logout:hover { border-color: var(--accent); color: var(--heading) }

/* Hamburger */
.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 4px; flex-direction: column; gap: 5px }
.hamburger i { display: block; width: 20px; height: 2px; background: var(--muted); border-radius: 1px; transition: .2s }

/* Loading skeleton */
.skeleton { background: linear-gradient(90deg, var(--card) 25%, #1c2540 50%, var(--card) 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 6px; min-height: 28px }
@keyframes shimmer { 0% { background-position: 200% 0 } 100% { background-position: -200% 0 } }
.loading .value, .loading .stat .value { color: transparent; position: relative }
.loading .value::after { content: ''; position: absolute; inset: 4px 0; background: linear-gradient(90deg, var(--card) 25%, #1c2540 50%, var(--card) 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 4px }

/* Mobile */
@media (max-width: 768px) {
  .hamburger { display: flex }
  .topbar nav { position: fixed; top: 0; right: -260px; width: 260px; height: 100vh; background: var(--card); border-left: 1px solid var(--border); flex-direction: column; padding: 60px 24px 24px; gap: 16px; transition: right .25s; z-index: 100 }
  .topbar nav.open { right: 0 }
  .topbar nav a { font-size: 16px }
  .topbar nav a.active { border-bottom: none; color: var(--accent) }
  .nav-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 99 }
  .nav-overlay.open { display: block }
}