* {
    box-sizing: border-box;
    font-family: "Segoe UI", sans-serif;
  }
  
  body {
    background: linear-gradient(135deg, #020617, #0f172a);
    color: #fff;
    display: flex;
    justify-content: center;
    padding: 40px 10px;
    margin: 0;
  }
  
  .app {
    max-width: 900px;
    width: 100%;
    background: #020617;
    padding: 25px 30px;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  }
  
  h1 {
    text-align: center;
    margin-bottom: 6px;
  }
  
  .subtitle {
    text-align: center;
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 20px;
  }
  
  .grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  
  .field label {
    font-size: 13px;
    margin-bottom: 6px;
    display: block;
  }
  
  .field input,
  .field select {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: none;
    outline: none;
    font-size: 14px;
  }
  
  .buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
  }
  
  button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    cursor: pointer;
    background: #2563eb;
    color: #fff;
  }
  
  button.reset {
    background: #334155;
  }
  
  button:hover {
    opacity: 0.9;
  }
  
  .result-box {
    margin-top: 20px;
    padding: 18px;
    border-radius: 12px;
    background: #020617;
    border: 1px solid #1e293b;
    text-align: center;
  }
  
  .progress {
    width: 100%;
    height: 12px;
    background: #1e293b;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 12px;
  }
  
  #progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #22c55e, #eab308, #ef4444);
    transition: width 0.5s ease;
  }
  
  #probability {
    font-size: 36px;
    margin: 5px 0;
  }
  
  .seo {
    margin-top: 30px;
    font-size: 15px;
    line-height: 1.7;
    opacity: 0.95;
  }
  
  .seo table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
  }
  
  .seo th, .seo td {
    border: 1px solid #1e293b;
    padding: 10px;
    text-align: left;
  }
  
  footer {
    margin-top: 25px;
    text-align: center;
    font-size: 13px;
    opacity: 0.7;
  }
  
  @media (max-width: 600px) {
    .grid {
      grid-template-columns: 1fr;
    }
  }