:root {
      --light-bg: #f0f0f0;
      --light-text: #333;
      --light-box: #fff;
      --light-accent: #4CAF50;
      --light-hover: #45a049;
      --light-reset: #f44336;

      --dark-bg: #181818;
      --dark-text: #f0f0f0;
      --dark-box: #232323;
      --dark-accent: #81c784;
      --dark-hover: #388e3c;
      --dark-reset: #e57373;
    }

    body {
      margin: 0;
      font-family: Arial, sans-serif;
      background-color: var(--light-bg);
      color: var(--light-text);
      display: flex;
      flex-direction: column;
      min-height: 100vh;
      transition: background 0.3s, color 0.3s;
    }

    .overlay {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100vw;
      height: 100vh;
      background: rgba(0,0,0,0.5);
      z-index: 9999;
      align-items: center;
      justify-content: center;
    }

    .spinner {
      border: 6px solid #f3f3f3;
      border-top: 6px solid var(--light-accent);
      border-radius: 50%;
      width: 50px;
      height: 50px;
      animation: spin 1s linear infinite;
    }

    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    .toast {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background: #333;
      color: #fff;
      padding: 10px 20px;
      border-radius: 5px;
      display: none;
      z-index: 10000;
    }
 header, footer {
      padding: 15px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .toggle-group {
      display: flex;
      gap: 10px;
    }

    .mode-toggle, .lang-toggle {
      background: none;
      border: 1px solid #ccc;
      border-radius: 20px;
      padding: 6px 16px;
      font-size: 1em;
      cursor: pointer;
      color: inherit;
    }

    main {
      flex-grow: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    .container {
      max-width: 500px;
      width: 100%;
      background: var(--light-box);
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
      text-align: center;
    }

    h1 { color: var(--light-accent); margin-bottom: 20px; }
    label, #version { display: block; margin: 12px 0 5px; font-size: 1.1em; }
    input[type="text"], select {
      width: 90%; padding: 10px; font-size: 1em;
      border: 1px solid #ccc; border-radius: 4px;
      background: inherit; color: inherit;
    }

    button {
      padding: 10px 20px; margin: 10px 5px 0;
      font-size: 1em; border: none;
      border-radius: 5px; color: #fff;
      cursor: pointer;
    }
    button:disabled { background-color: #ccc; cursor: not-allowed; }
    button[type="submit"] { background-color: var(--light-accent); }
    button[type="submit"]:hover:not(:disabled) { background-color: var(--light-hover); }
    button[type="reset"] { background-color: var(--light-reset); }
    .ad-section, .donation-section, .feedback-link {
      text-align: center; margin-top: 20px;
    }
    .feedback-link {
        text-align: center;
      display: inline-block; padding: 8px 18px;
      background: #4CAF50; color: #fff;
      border-radius: 20px; text-decoration: none;
    }

    .donation-section img { height: 45px; width: 162px; }

    body.dark-mode {
      background-color: var(--dark-bg);
      color: var(--dark-text);
    }
    body.dark-mode .container { background-color: var(--dark-box); }
    body.dark-mode h1 { color: var(--dark-accent); }
    body.dark-mode input, body.dark-mode select {
      background-color: #2c2c2c; border: 1px solid #444; color: var(--dark-text);
    }
    body.dark-mode button[type="submit"] { background-color: var(--dark-accent); }
    body.dark-mode button[type="submit"]:hover { background-color: var(--dark-hover); }
    body.dark-mode button[type="reset"] { background-color: var(--dark-reset); }
    body.dark-mode .feedback-link { background: #81c784; color: #232323; }
    /* Other existing styles preserved... */