* { box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { margin: 0; background-color: #f4f6f9; color: #333; }
.login-bg { display: flex; justify-content: center; align-items: center; height: 100vh; background-color: #2c3e50; }
.login-container { background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); width: 100%; max-width: 400px; }
.form-group { margin-bottom: 15px; }
.form-control { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; }
.btn { padding: 10px 15px; border: none; border-radius: 4px; cursor: pointer; color: #fff; }
.btn-primary { background-color: #3498db; }
.btn-block { width: 100%; }
.alert { padding: 10px; margin-bottom: 15px; border-radius: 4px; }
.alert-danger { background-color: #f8d7da; color: #721c24; }
.text-center { text-align: center; }
.mt-3 { margin-top: 15px; }
.main-content { display: flex; min-height: 100vh; }
.sidebar { width: 250px; background: #2c3e50; color: #fff; padding: 20px; }
.sidebar a { color: #fff; text-decoration: none; display: block; padding: 10px 0; border-bottom: 1px solid #34495e; }
.content { flex: 1; padding: 20px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.stat-card { background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.05); text-align: center; }