/* Gaya asas, boleh disesuaikan */
body { font-family: Arial, sans-serif; background-color: #f8f9fa; margin: 0; }
.container { max-width: 900px; margin: 40px auto; padding: 25px; background: #fff; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
header { background: #28a745; color: white; padding: 15px 20px; text-align: center; border-radius: 8px 8px 0 0; margin: -25px -25px 25px -25px; }
header h1 { margin: 0; }
header a { color: white; float: right; text-decoration: none; background: #dc3545; padding: 8px 15px; border-radius: 5px; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: bold; }
.form-group input { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; }
.btn { display: inline-block; background: #28a745; color: white; padding: 12px 25px; border: none; border-radius: 5px; cursor: pointer; text-decoration: none; font-size: 1em; }
.btn:hover { background: #218838; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin: 20px 0; }
.stat-card { background: #e9ecef; padding: 20px; text-align: center; border-radius: 5px; }
.stat-card h3 { margin: 0; font-size: 2em; color: #495057; }
.referral-link-box { background: #f8f9fa; border: 1px dashed #ced4da; padding: 15px; text-align: center; border-radius: 5px; }
.referral-link-box input { width: 80%; padding: 8px; }
table { width: 100%; border-collapse: collapse; margin-top: 20px; }
table th, table td { border: 1px solid #dee2e6; padding: 12px; text-align: left; }
table th { background-color: #f8f9fa; }