:root { --primary: #007bff; --dark: #343a40; --light: #f8f9fa; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: #f0f2f5; margin: 0; }
.container { max-width: 1000px; margin: 40px auto; padding: 20px; }
.card { background: white; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); overflow: hidden; margin-bottom: 20px; }
.card-header { background: var(--dark); color: white; padding: 15px 20px; display: flex; justify-content: space-between; align-items: center; }
.card-body { padding: 20px; }
.btn { display: inline-block; padding: 8px 16px; border-radius: 4px; text-decoration: none; cursor: pointer; border: none; font-size: 14px; }
.btn-primary { background: var(--primary); color: white; }
.btn-danger { background: #dc3545; color: white; }
.btn-warning { background: #ffc107; color: #212529; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-control { width: 100%; padding: 8px; border: 1px solid #ddd; border-radius: 4px; box-sizing: border-box; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid #ddd; }
th { background: #f8f9fa; }
.badge { padding: 4px 8px; border-radius: 4px; font-size: 12px; color: white; }
.bg-success { background: #28a745; }
.bg-secondary { background: #6c757d; }
.nav a { color: rgba(255,255,255,0.8); margin-left: 15px; text-decoration: none; }
.nav a:hover { color: white; }
.alert { padding: 10px; border-radius: 4px; margin-bottom: 15px; }
.alert-error { background: #f8d7da; color: #721c24; }
.alert-success { background: #d4edda; color: #155724; }