body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f4f6f9; margin: 0; padding: 0; color: #333; }
.container { max-width: 900px; margin: 30px auto; background: #fff; padding: 25px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); }
h2, h3 { color: #2c3e50; border-bottom: 2px solid #ecf0f1; padding-bottom: 10px; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: bold; }
.form-control { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; }
.btn { background: #3498db; color: #fff; padding: 10px 20px; border: none; border-radius: 4px; cursor: pointer; text-decoration: none; display: inline-block; font-size: 14px; }
.btn:hover { background: #2980b9; }
.btn-danger { background: #e74c3c; }
.btn-danger:hover { background: #c0392b; }
table { width: 100%; border-collapse: collapse; margin-top: 20px; }
table, th, td { border: 1px solid #ddd; }
th, td { padding: 12px; text-align: left; }
th { background-color: #f8f9fa; }
.alert { padding: 12px; margin-bottom: 20px; border-radius: 4px; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.nav { background: #2c3e50; padding: 15px; margin-bottom: 20px; border-radius: 4px; }
.nav a { color: #fff; margin-right: 15px; text-decoration: none; font-weight: bold; }
.nav a:hover { text-decoration: underline; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 20px; }
.card { background: #fdfdfd; border: 1px solid #e0e0e0; padding: 20px; border-radius: 8px; text-align: center; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.card h4 { margin-top: 0; color: #2c3e50; }
.card .price { font-size: 24px; color: #27ae60; font-weight: bold; margin: 10px 0; }
.bandwidth-display { background: #e8f8f5; border-left: 5px solid #2ecc71; padding: 15px; border-radius: 4px; margin-bottom: 20px; }