:root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
    --accent: #ef4444; /* Red for burning money */
    --green: #22c55e;
  }
  
  body {
    background-color: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
  }
  
  .container {
    text-align: center;
    width: 90%;
    max-width: 400px;
  }
  
  h1 { margin: 0; font-size: 2rem; }
  p { color: #94a3b8; margin-top: 5px; }
  
  .input-group {
    display: flex;
    gap: 10px;
    margin: 2rem 0;
  }
  
  .field { flex: 1; }
  
  label {
    display: block;
    font-size: 0.8rem;
    color: #94a3b8;
    margin-bottom: 5px;
  }
  
  input {
    width: 100%;
    background: var(--card);
    border: 1px solid #334155;
    color: white;
    padding: 10px;
    border-radius: 8px;
    font-size: 1.2rem;
    text-align: center;
    box-sizing: border-box;
  }
  
  .display {
    font-size: 4rem;
    font-weight: bold;
    font-variant-numeric: tabular-nums;
    color: var(--accent);
    margin: 1rem 0;
  }
  
  .currency { font-size: 2rem; vertical-align: super; opacity: 0.7; }
  
  .verdict {
    height: 1.5rem;
    color: #cbd5e1;
    font-style: italic;
    margin-bottom: 2rem;
  }
  
  button {
    width: 100%;
    padding: 15px;
    font-size: 1.2rem;
    font-weight: bold;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    background: var(--green);
    color: white;
    transition: transform 0.1s;
  }
  
  button:active { transform: scale(0.98); }
  
  button.secondary {
    background: transparent;
    border: 1px solid #334155;
    color: #94a3b8;
    margin-top: 10px;
    font-size: 1rem;
  }
  
  .running #startBtn {
    background-color: var(--accent);
  }