:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #e0e7ff;
  --secondary: #0f172a;
  --background: #f8fafc;
  --surface: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  --transition: all 0.2s ease-in-out;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Utilities */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.625rem 1rem; border-radius: var(--radius-md); font-weight: 500;
  font-size: 0.875rem; cursor: pointer; border: none; transition: var(--transition);
  font-family: inherit;
}
.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover { background-color: var(--primary-hover); transform: translateY(-1px); }
.btn-danger { background-color: transparent; color: var(--danger); padding: 0.5rem; border-radius: var(--radius-md); }
.btn-danger:hover { background-color: #fee2e2; }

.input-group { display: flex; flex-direction: column; gap: 0.375rem; margin-bottom: 1rem; }
.input-label { font-size: 0.875rem; font-weight: 500; color: var(--text-primary); }
.input-field {
  padding: 0.625rem 0.75rem; border-radius: var(--radius-md); border: 1px solid var(--border);
  background-color: var(--surface); font-family: inherit; font-size: 0.875rem;
  color: var(--text-primary); transition: var(--transition);
}
.input-field:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }

.card { background: var(--surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); border: 1px solid var(--border); }
.page-header { margin-bottom: 2rem; }
.page-title { font-size: 1.5rem; font-weight: 700; color: var(--secondary); margin-bottom: 0.5rem; }
.page-desc { color: var(--text-secondary); font-size: 0.875rem; }

/* Auth Layout */
.auth-wrapper {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%); padding: 1rem;
}
.auth-card {
  width: 100%; max-width: 400px; background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px); padding: 2.5rem; border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg); border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Dashboard Layout */
.dashboard-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 260px; background-color: var(--surface); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; flex-shrink: 0;
}
.sidebar-header { padding: 1.5rem; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 0.75rem; font-weight: 600; color: var(--secondary); }
.nav-links { padding: 1rem; display: flex; flex-direction: column; gap: 0.5rem; flex-grow: 1; }
.nav-link {
  display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem;
  border-radius: var(--radius-md); color: var(--text-secondary); text-decoration: none;
  font-weight: 500; font-size: 0.875rem; transition: var(--transition); cursor: pointer;
}
.nav-link:hover { background-color: var(--background); color: var(--primary); }
.nav-link.active { background-color: var(--primary-light); color: var(--primary); }
.sidebar-footer { padding: 1.5rem; border-top: 1px solid var(--border); }
.logout-btn {
  background: none; border: none; color: var(--text-secondary); display: flex;
  align-items: center; gap: 0.5rem; cursor: pointer; font-size: 0.875rem; font-weight: 500;
  width: 100%; text-align: left; transition: var(--transition); font-family: inherit;
}
.logout-btn:hover { color: var(--danger); }

.main-content { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.top-header {
  background-color: var(--surface); height: 64px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: flex-end; padding: 0 2rem; flex-shrink: 0;
}
.content-wrapper { padding: 2rem; flex: 1; overflow-y: auto; }

/* Grid Layouts */
.grid-2col { display: grid; grid-template-columns: minmax(300px, 1fr) 2fr; gap: 2rem; }
@media (max-width: 768px) {
  .grid-2col { grid-template-columns: 1fr; }
  .dashboard-layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; border-right: none; border-bottom: 1px solid var(--border); }
}

/* Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.animate-fade { animation: fadeIn 0.3s ease-out forwards; }