html, body {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      height: 100%;
      width: 100%;
      overflow: hidden; /* Empêche tout défilement */
      cursor: none; /* Cache le curseur au profit de la raquette */
    }

    /* ===== PAGE DE PAIEMENT RÉTRO ===== */
    body.payment-page {
      font-family: 'Press Start 2P', monospace, sans-serif; /* Police pixelisée */
      background: #1a1a2e; /* Fond sombre d'arcade */
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      position: relative;
    }
    
    /* ===== JEU EN FOND ===== */
    #game-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
    }


    /* ===== CONTAINER DU FORMULAIRE ===== */
    .payment-container {
      background: rgba(0, 0, 0, 0.4);
      border-radius: 0;
      box-shadow: 0 0 0 4px #fff, 0 0 0 8px #ff00ff; /* Double bordure néon */
      padding: 30px;
      width: 100%;
      max-width: 450px;
      box-sizing: border-box;
      position: relative;
      z-index: 2;
      border: 4px solid #00ffff;
      text-align: center;
    }

    /* ===== TITRES ===== */
    .payment-container h2 {
      text-align: center;
      margin-top: 0;
      margin-bottom: 30px;
      color: #ffff00; /* Jaune néon */
      font-weight: 400;
      letter-spacing: 2px;
      text-shadow: 2px 2px #ff00ff;
      font-size: 1.5em;
    }

    /* ===== FORMULAIRE ===== */
    .form-group {
      margin-bottom: 20px;
      text-align: left;
    }

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 400;
      color: #00ffff; /* Cyan néon */
      font-size: 0.8em;
    }

    .form-group input {
      width: 100%;
      padding: 10px;
      border: 2px solid #fff;
      background: #333;
      border-radius: 0;
      font-size: 1em;
      transition: all 0.2s ease;
      box-sizing: border-box;
      color: #fff;
      font-family: 'Courier New', Courier, monospace;
    }
     .form-group input::placeholder {
      color: #aaa;
    }

     .form-group input.invalid {
        border-color: #ff3860;
        box-shadow: 0 0 10px #ff3860;
    }

    .form-group input:focus {
      border-color: #ffff00;
      background: #444;
      box-shadow: 0 0 10px #ffff00;
      outline: none;
    }

    /* ===== LIGNES MULTIPLES ===== */
    .form-row {
      display: flex;
      gap: 15px;
    }

    .form-row .form-group {
      flex: 1;
    }

    /* ===== BOUTONS ===== */
    .pay-btn, .tip-btn {
      width: 100%;
      padding: 15px;
      border-radius: 0;
      font-size: 1.1em;
      font-weight: bold;
      cursor: none;
      transition: all 0.2s ease;
      border: 2px solid;
      font-family: 'Press Start 2P', monospace;
      text-transform: uppercase;
    }

    .pay-btn {
      background: #ff00ff;
      color: #fff;
      margin-bottom: 15px;
      border-color: #fff;
    }

    .pay-btn:hover {
      background: #fff;
      color: #ff00ff;
      box-shadow: 0 0 15px #ff00ff;
    }

    .tip-btn {
      background: #00ffff;
      color: #1a1a2e;
      border-color: #1a1a2e;
    }
    .tip-btn:hover {
      background: #1a1a2e;
      color: #00ffff;
      border-color: #00ffff;
      box-shadow: 0 0 15px #00ffff;
    }
    .tip-btn:disabled {
        opacity: 0.7;
    }

    /* ===== CONTENEUR DU CONSEIL GEMINI & ERREUR ===== */
    .tip-container, #error-message {
        margin-top: 20px;
        padding: 15px;
        background-color: #222;
        color: #ffff00;
        min-height: 50px;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        transition: all 0.5s ease;
        font-size: 0.8em;
        line-height: 1.4;
    }
    .tip-container {
        border: 2px solid #ffff00;
    }
    .tip-container.hidden, #error-message.hidden {
        display: none;
    }
    #error-message {
        color: #ff3860;
        border: 2px solid #ff3860;
    }
    .tip-container.error {
        color: #ff3860;
        border-color: #ff3860;
    }