/* دکمه‌ی شناور «ورود / ثبت‌نام» در صفحه‌های معرفی (presentation.html، training.html) */
  .float-auth{
    position:fixed; bottom:20px; left:20px; z-index:200;
    display:flex; align-items:center; gap:8px;
    background:linear-gradient(135deg,#C97B63,#B96C55);
    color:#fff !important; text-decoration:none;
    padding:12px 18px; border-radius:30px;
    font-family:'Vazirmatn',Tahoma,sans-serif; font-size:12.5px; font-weight:800;
    box-shadow:0 6px 18px rgba(185,108,85,.4);
    transition:transform .15s ease;
  }
  .float-auth:hover{ transform:translateY(-2px); }
  .float-auth svg{ flex-shrink:0; }
  @media (max-width:480px){
    .float-auth{ bottom:14px; left:14px; padding:10px 15px; font-size:11.5px; }
  }