:root {
    --primary-color: #3ea6ff;
    --primary-dark: #2d8fd6;
    --error-color: #ff4d4d;
    --success-color: #4CAF50;
    --dark-bg: #181818;
    --darker-bg: #202020;
    --light-text: #ffffff;
    --gray-text: #aaaaaa;
    --border-color: #383838;
    --border-radius: 8px;
    --transition-speed: 0.3s;
    --box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }
  
  body {
    font-family: 'Roboto', 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('img/auth-bg.jpg');
    background-size: cover;
    background-position: center;
  }

  .auth-container {
    width: 100%;
    max-width: 500px;
    padding: 2.5rem;
    background-color: rgba(32, 32, 32, 0.9);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    backdrop-filter: blur(5px);
    margin: 1rem;
  }
  
  /* Logo */
  .logo {
    text-align: center;
    margin-bottom: 2rem;
  }
  
  .logo img {
    height: 60px;
    margin-bottom: 1rem;
  }
  
  .logo h1 {
    margin: 0.5rem 0;
    font-size: 1.8rem;
    color: var(--light-text);
  }
  
  .logo p {
    margin: 0;
    color: var(--gray-text);
    font-size: 0.9rem;
  }
  
  /* Foto de perfil */
  .profile-picture-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1.5rem;
  }
  
  .profile-picture-preview {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background-color: var(--darker-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    overflow: hidden;
    position: relative;
    border: 3px solid var(--primary-color);
  }
  
  .profile-picture-preview i {
    font-size: 2.5rem;
    color: var(--gray-text);
  }
  
  #profile-image {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
  }
  
  .upload-btn-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
  }
  
  .upload-btn {
    background-color: var(--darker-bg);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .upload-btn:hover {
    background-color: rgba(62, 166, 255, 0.1);
  }
  
  .upload-btn-wrapper input[type=file] {
    font-size: 100px;
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
  }
  
  /* Formulario */
  .auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
  }
  
  /* Grupos de formulario */
  .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .form-group label {
    font-size: 0.9rem;
    font-weight: 500;
  }
  
  .required {
    color: var(--error-color);
    font-size: 0.8rem;
  }
  
  .input-icon {
    position: relative;
    display: flex;
    align-items: center;
  }
  
  .input-icon i {
    position: absolute;
    left: 15px;
    color: var(--gray-text);
  }
  
  .input-icon input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    background-color: var(--darker-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--light-text);
    font-size: 0.95rem;
    transition: border-color var(--transition-speed);
  }
  
  .input-icon input:focus {
    outline: none;
    border-color: var(--primary-color);
  }
  
  /* Estilos específicos para el campo de fecha */
  input[type="date"] {
    appearance: none;
    -webkit-appearance: none;
  }
  
  input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.6);
    cursor: pointer;
  }
  
  .input-hint {
    margin: 0.3rem 0 0 0;
    font-size: 0.75rem;
    color: var(--gray-text);
    font-style: italic;
  }
  
  /* Mostrar contraseña */
  .show-password {
    position: absolute;
    right: 15px;
    background: none;
    border: none;
    color: var(--gray-text);
    cursor: pointer;
    transition: color var(--transition-speed);
  }
  
  .show-password:hover {
    color: var(--light-text);
  }
  
  /* Fuerza de contraseña */
  .password-strength {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
  }
  
  .strength-bar {
    height: 4px;
    width: 30%;
    background-color: var(--error-color);
    border-radius: 2px;
    transition: all var(--transition-speed);
  }
  
  .strength-text {
    font-size: 0.75rem;
    color: var(--gray-text);
  }
  
  .password-requirements {
    margin: 0.5rem 0 0 0;
    padding: 0;
    list-style: none;
    font-size: 0.75rem;
    color: var(--gray-text);
  }
  
  .password-requirements li {
    margin: 0.3rem 0;
    position: relative;
    padding-left: 1.2rem;
  }
  
  .password-requirements li::before {
    content: "✗";
    position: absolute;
    left: 0;
    color: var(--error-color);
  }
  
  .password-requirements li.valid::before {
    content: "✓";
    color: var(--success-color);
  }
  
  .terms {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    margin: 1rem 0;
  }
  
  .terms a {
    color: var(--primary-color);
    text-decoration: none;
  }
  
  .terms a:hover {
    text-decoration: underline;
  }
  
  .btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-speed);
    margin-top: 0.5rem;
  }
  
  .btn-primary:hover {
    background-color: var(--primary-dark);
  }

  .auth-switch {
    text-align: center;
    font-size: 0.9rem;
    margin-top: 1.5rem;
    color: var(--gray-text);
  }
  
  .auth-switch a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-speed);
  }
  
  .auth-switch a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
  }

  input:invalid {
    border-color: var(--error-color);
  }
  
  input:valid {
    border-color: var(--success-color);
  }
  
  @media (max-width: 500px) {
    .auth-container {
      padding: 1.5rem;
    }
    
    .logo h1 {
      font-size: 1.5rem;
    }
    
    .input-icon input {
      padding: 0.7rem 0.8rem 0.7rem 2.2rem;
    }
  }

  .error-message {
    color: red;
    text-align: center;
    margin-top: 10px;
  }