body {
      font-family: 'Open Sans', sans-serif;
      background: #f0f4f8;
      margin: 0;
      padding: 0;
      transition: background-color 0.3s;
    }

    .dark-mode {
      background-color: #121212;
      color: #fff;
    }

    .container {
      max-width: 450px;
      margin: 40px auto;
      padding: 30px;
      background: #fff;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      transition: background 0.3s;
    }

    .dark-mode .container {
      background: #1e1e1e;
    }

    .logo {
      display: block;
      margin: 0 auto 20px;
      width: 100px;
    }

    h2 {
      text-align: center;
      color: #006940;
      margin-bottom: 25px;
    }

    .dark-mode h2 {
      color: #78c2ad;
    }

    .tab {
      display: flex;
      justify-content: space-between;
      margin-bottom: 20px;
    }

    .tab button {
      flex: 1;
      padding: 10px;
      border: none;
      background: #f0f0f0;
      cursor: pointer;
      transition: 0.3s;
    }

    .tab button.active {
      background: #006940;
      color: white;
    }

    .form-group {
      margin-bottom: 15px;
      position: relative;
    }

    .form-group input {
      width: 100%;
      padding: 12px 40px 12px 12px;
      border: 1px solid #ccc;
      border-radius: 6px;
      box-sizing: border-box;
    }

    .form-group i {
      position: absolute;
      right: 12px;
      top: 50%;
      transform: translateY(-50%);
      color: #aaa;
    }

    .submit-btn {
      background-color: #006940;
      color: white;
      border: none;
      padding: 12px;
      width: 100%;
      border-radius: 6px;
      cursor: pointer;
      font-size: 16px;
      transition: background-color 0.3s;
    }

    .submit-btn:hover {
      background-color: #004d2a;
    }

    .toggle-mode {
      text-align: center;
      margin-top: 15px;
    }

    .toggle-mode button {
      background: none;
      border: 1px solid #ccc;
      padding: 6px 12px;
      border-radius: 20px;
      cursor: pointer;
    }

    .form-section {
      display: none;
    }

    .form-section.active {
      display: block;
    }