/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  /* Variáveis de cores */
  :root {
    --bg-color: #f0f4f8;
    --text-color: #333;
    --primary-color: #28a745; /* Verde minimalista */
    --secondary-color: #ffffff;
    --accent-color: #1d7a3a; /* Verde escuro para destaque */
    --shadow-color: rgba(0, 0, 0, 0.1);
  }
  
  body.dark {
    --bg-color: #121212;
    --text-color: #f5f5f5;
    --primary-color: #28a745;
    --secondary-color: #1e1e1e;
    --accent-color: #1d7a3a;
    --shadow-color: rgba(255, 255, 255, 0.1);
  }
  
  /* Estilo geral */
  body {
    font-family: 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s ease-in-out;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
  }
  
  .container {
    width: 100%;
    max-width: 600px;
    background-color: var(--secondary-color);
    box-shadow: 0 4px 8px var(--shadow-color);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
  }
  
  /* Header */
  header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
    font-weight: bold;
  }
  
  header p {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 20px;
  }
  
  /* Main */
  main {
    margin: 20px 0;
  }
  
  input {
    width: 100%;
    padding: 15px;
    margin-bottom: 15px;
    border: 2px solid var(--primary-color);
    border-radius: 5px;
    font-size: 1rem;
    outline: none;
    box-shadow: 0 2px 4px var(--shadow-color);
    transition: border-color 0.3s, box-shadow 0.3s;
  }
  
  input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 4px 8px var(--shadow-color);
  }
  
  /* Dropdown */
  .dropdown {
    position: relative;
    display: inline-block;
    width: 100%;
  }
  
  .dropdown-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    box-shadow: 0 2px 4px var(--shadow-color);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
  }
  
  .dropdown-btn i {
    margin-right: 8px;
  }
  
  .dropdown-btn:hover {
    background-color: var(--accent-color);
    transform: scale(1.05);
  }
  
  .dropdown-menu {
    display: none;
    position: absolute;
    top: 50px;
    left: 0;
    background-color: var(--secondary-color);
    box-shadow: 0 4px 8px var(--shadow-color);
    border-radius: 5px;
    padding: 10px;
    z-index: 100;
    width: 100%;
  }
  
  .dropdown-menu button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1rem;
    padding: 10px;
    text-align: left;
    width: 100%;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
  }
  
  .dropdown-menu button:hover {
    background-color: var(--bg-color);
    border-radius: 5px;
  }
  
  /* Result */
  .result {
    margin-top: 20px;
    padding: 15px;
    border-radius: 5px;
    background-color: var(--secondary-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    white-space: pre-wrap;
    word-wrap: break-word;
    transition: background-color 0.3s;
  }
  
  /* Histórico */
  .history {
    margin-top: 15px;
    text-align: left;
    background-color: var(--bg-color);
    padding: 15px;
    border-radius: 5px;
    font-size: 0.9rem;
    box-shadow: 0 2px 4px var(--shadow-color);
    overflow-y: auto;
    max-height: 150px;
  }
  
  .history p {
    margin-bottom: 5px;
    word-break: break-word;
  }
  
  /* Footer */
  footer {
    margin-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
  }
  
  footer p {
    color: var(--text-color);
  }
  
  #toggle-theme {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary-color);
    transition: transform 0.3s ease;
  }
  
  #toggle-theme:hover {
    transform: rotate(20deg);
  }
  
  /* Responsividade */
  @media (max-width: 600px) {
    header h1 {
      font-size: 1.8rem;
    }
  
    input {
      font-size: 0.9rem;
    }
  
    .dropdown-btn {
      font-size: 0.9rem;
      padding: 10px 15px;
    }
  
    .dropdown-menu button {
      font-size: 0.9rem;
      padding: 8px;
    }
  }