:root {
    --bg: #f0f4f8;
    --card: #ffffff2a;
    --text: #222;
    --input: #f9f9f9;
    --primary: #00C9FF;
    --secondary: #1d4881;
    --border: #ccc;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --bg: #1e1e1e;
      --card: #2a2a2a00;
      --text: #eeeeee8f;
      --input: #3a3a3a;
      --border: #444;
    }
  }
  * {
    box-sizing: border-box;
  }
  body {
    background-image: url(img/fb1f01f8c5133fa43add7b48faa6e2e8.jpg);
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  .form-container {
    background: var(--card);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 10px 10px 30px rgba(0,0,0,0.1),
                -10px -10px 30px rgba(255,255,255,0.2);
    width: 100%;
    max-width: 400px;
  }
  h1 {
    color: #1d4881;
    text-align: center;
    margin-bottom: 25px;
  }
  .form-group {
    margin-bottom: 20px;
    position: relative;
  }
  .form-group i {
    position: absolute;
    left: 15px;
    top: 5px;
    color: var(--primary);
  }
  input, textarea {
    width: 100%;
    padding: 12px 12px 12px 40px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 16px;
    background: var(--input);
    color: var(--text);
  }
  input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
  }
  textarea {
    resize: vertical;
    min-height: 100px;
  }
  .super-boton {
    display: inline-block;
    width: 100%;
    padding: 14px;
    background: linear-gradient(120deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: bold;
    color: white;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
    box-shadow: 0 8px 20px rgba(0,201,255,0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .super-boton:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0,201,255,0.4);
  }
  .mensaje-css {
    display: none;
    margin-top: 15px;
    text-align: center;
    color: green;
    font-weight: bold;
    font-size: 14px;
  }
  p{
    color: #61af68;
  }