body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 20px;
    text-align: center;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.4s ease;
  }

  .mode-toggle {
    position: fixed;
    top: 20px;
    right: 30px;
    display: flex;
    align-items: center;
    z-index: 999;
  }

  #mode-label {
    font-size: 28px;
    cursor: pointer;
    transition: transform 0.3s ease;
  }

  #mode-label:hover {
    transform: scale(1.2);
  }

  .toggle-switch {
    display: none;
  }

  :root {
    --bg-color: #f9f9f9;
    --text-color: #333;
    --input-bg: white;
    --btn-bg: #3498db;
    --btn-hover-bg: #2980b9;
    --border-color: #ddd;
  }

  body.dark-mode {
    --bg-color: #1b1b1b;
    --text-color: #fff;
    --input-bg: #333;
    --btn-bg: #ff3e30;
    --btn-hover-bg: #e02219;
    --border-color: #555;
  }

  .container {
    max-width: 600px;
    margin: 80px auto 20px;
    background: var(--input-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
  }

  h1 {
    font-size: 2.2rem;
    margin-bottom: 24px;
    color: var(--text-color);
  }

  .form-container {
    background-color: var(--input-bg);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 30px;
  }

  .input-group {
    margin-bottom: 20px;
    text-align: left;
  }

  label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
  }

  input[type="text"],
  input[type="password"],
  select {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-color);
    transition: 0.3s ease;
  }

  input:focus,
  select:focus {
    border-color: var(--btn-bg);
    box-shadow: 0 0 5px var(--btn-bg);
  }

  button.styled-btn {
    background: var(--btn-bg);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin: 6px;
    font-weight: 600;
    transition: 0.3s ease;
  }

  button.styled-btn:hover {
    background: var(--btn-hover-bg);
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  }

  #password-strength {
    height: 8px;
    width: 100%;
    background-color: var(--border-color);
    border-radius: 5px;
    margin-top: 8px;
  }

  #password-strength span {
    display: block;
    height: 100%;
    background: var(--btn-bg);
    border-radius: 5px;
    transition: width 0.3s ease;
  }

  #password-list {
    text-align: left;
    background-color: var(--input-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
  }

  #password-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
  }

  .copy-btn,
  .delete-btn {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    margin-left: 10px;
  }

  .copy-btn {
    color: var(--btn-bg);
  }

  .delete-btn {
    color: #e74c3c;
  }

  @media (max-width: 600px) {
    .container {
      margin-top: 100px;
      padding: 15px;
    }

    .form-container,
    #password-list {
      padding: 15px;
    }

    button.styled-btn {
      width: 100%;
      margin: 8px 0;
    }
  }