.btn-login {
      padding: 12px 24px;
      background: #0078d4;
      color: white;
      font-weight: bold;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      margin: 2rem;
    }

    .overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100vw; height: 100vh;
      background: rgba(0, 0, 0, 0.6);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s ease, visibility 0.3s ease;
      z-index: 1000;
    }

    .overlay.active {
      opacity: 1;
      visibility: visible;
    }

    .login-popin {
      background: white;
      padding: 2rem;
      border-radius: 12px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.2);
      width: 100%;
      max-width: 400px;
      opacity: 0;
      transform: scale(0.9);
      transition: transform 0.3s ease, opacity 0.3s ease;
      position: relative;
    }

    .overlay.active .login-popin {
      opacity: 1;
      transform: scale(1);
    }

    .login-popin h2 {
      margin-top: 0;
      text-align: center;
    }

    .login-popin form {
      display: flex;
      flex-direction: column;
    }

    .login-popin input {
      padding: 0.8rem;
      margin: 0.5rem 0;
      border: 1px solid #ccc;
      border-radius: 6px;
      font-size: 1rem;
    }

    .login-popin button {
      padding: 0.8rem;
      background: #26b6be;
      color: white;
      font-weight: bold;
      border: none;
      border-radius: 6px;
      margin-top: 1rem;
      cursor: pointer;
      transition: background 0.2s;
    }

    .login-popin button:hover {
      background: #005fa3;
    }

    .close-popin {
      position: absolute;
      top: 12px;
      right: 12px;
      font-size: 20px;
      font-weight: bold;
      background: none;
      border: none;
      cursor: pointer;
      color: #666;
    }

    .close-popin:hover {
      color: #000;
    }