* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
  }

  body {
    background: #f4f4f4;
    color: #333;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
  }

  .start-container,
  .loader-container {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease;
  }

  .start-button {
    background: #ffffff;
    color: #333;
    border: 2px solid #ccc;
    padding: 2rem 4rem;
    font-size: 1.4rem;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
  }

  .start-button:hover {
    background: #f0f0f0;
    transform: scale(1.05);
  }

  .loader-container {
    flex-direction: column;
    opacity: 0;
    display: none;
  }

  .loader-text {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #555;
    animation: fadeIn 0.5s ease-in-out;
  }

  .progress-bar {
    width: 60%;
    height: 10px;
    background: #ddd;
    border-radius: 5px;
    overflow: hidden;
  }

  .progress-fill {
    height: 100%;
    width: 0;
    background: #999;
    transition: width 1s ease;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }