:root {
  --primary: #0d6efd;
  --secondary: #6c757d;
  --success: #198754;
  --danger: #dc3545;
  --bg-light: #f5f7fa;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.back-btn {
    position: absolute;
    left: 20px;
    top: 20px;
    width: 38px;
    height: 38px;
    border: none;
    border-radius: 10px;
    background: white;
    color: #333;
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 999;
}