:root {
  --primary: #2c3e50;
  --secondary: #3498db;
  --success: #27ae60;
  --warning: #f39c12;
  --danger: #e74c3c;
  --bg: #f5f7fa;
  --border: #dee2e6;
  --text: #333;
}
* { box-sizing: border-box; }
body {
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
}
.container {
  max-width: 960px;
  margin: 0 auto 40px;
  padding: 0 20px;
}
.card {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,.06);
  padding: 20px;
  margin: 20px 0;
}
.card h2 {
  color: var(--primary);
  margin-top: 0;
  border-bottom: 2px solid var(--secondary);
  padding-bottom: 8px;
}
.btn {
  display: inline-block;
  padding: 8px 14px;
  background: var(--secondary);
  color: #fff;
  text-decoration: none;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.95em;
}
.btn:hover { background: #2980b9; color: #fff; }
.btn-primary { background: var(--secondary); }
.btn-success { background: var(--success); }
.btn-success:hover { background: #219653; }
.btn-warning { background: var(--warning); }
.btn-warning:hover { background: #d68910; }
.table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
}
.table th, .table td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
  font-size: 0.9em;
}
.table th { background: #f0f4f8; }
.flash {
  padding: 10px 14px;
  border-radius: 5px;
  margin: 10px 0;
}
.flash-info    { background: #e8f4fd; border-left: 4px solid var(--secondary); }
.flash-success { background: #d4edda; border-left: 4px solid var(--success); }
.flash-error   { background: #f8d7da; border-left: 4px solid var(--danger); }
.site-footer {
  text-align: center;
  color: #666;
  font-size: 0.85em;
  padding: 20px;
}
select, input[type=text], input[type=password], textarea {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1em;
}