* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      margin: 0;
      padding: 0;
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      /* El fondo ya no está aquí, se usará una etiqueta <img> */
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      position: relative;
    }

    /* Imagen de fondo como etiqueta HTML */
    .background-img {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover; /* Para que cubra toda la pantalla sin deformarse */
      z-index: 0;
    }

    /* Capa oscura para mejorar la legibilidad */
    .overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.6);
      z-index: 1;
    }

    /* Flecha de regreso */
    .back-arrow {
      position: fixed;
      left: 30px;
      top: 30px;
      color: white;
      font-size: 28px;
      text-decoration: none;
      transition: all 0.3s ease;
      width: 50px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.2);
      backdrop-filter: blur(5px);
      border: 1px solid rgba(255, 255, 255, 0.3);
      z-index: 1000;
    }

    .back-arrow:hover {
      background: white;
      color: #0d6efd;
      transform: scale(1.1);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
      border-color: white;
    }

    .container-login {
      position: relative;
      z-index: 2;
      display: flex;
      justify-content: center;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      padding: 15px;
    }

    .login-box {
      background: rgba(255, 255, 255, 0.95);
      padding: 30px 40px 40px;
      border-radius: 12px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      width: 100%;
      max-width: 420px;
      text-align: center;
      animation: aparecer 1s ease-out;
    }

    .login-header img {
      width: 100%;
      max-width: 220px;
      height: auto;
      display: block;
      margin: 0 auto 15px auto;
    }

    /* Custom dropdown con iconos */
    .custom-select-wrapper {
      position: relative;
      width: 100%;
      user-select: none;
      margin-bottom: 1.2rem;
    }

    .custom-select-trigger {
      background: white;
      border: 1px solid #ced4da;
      border-radius: 8px;
      padding: 12px 15px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .custom-select-trigger:hover {
      border-color: #86b7fe;
    }

    .custom-select-trigger.open {
      border-color: #0d6efd;
      box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
    }

    .selected-value {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1rem;
      color: #212529;
    }

    .selected-value i {
      font-size: 1.2rem;
      color: #0d6efd;
    }

    .arrow {
      transition: transform 0.2s;
      color: #6c757d;
    }

    .custom-select-trigger.open .arrow {
      transform: rotate(180deg);
    }

    .custom-options {
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background: white;
      border-radius: 8px;
      border: 1px solid #ced4da;
      margin-top: 5px;
      max-height: 250px;
      overflow-y: auto;
      z-index: 10;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.2s, visibility 0.2s;
    }

    .custom-options.open {
      opacity: 1;
      visibility: visible;
    }

    .option-item {
      padding: 10px 15px;
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      transition: background 0.15s;
    }

    .option-item i {
      font-size: 1.2rem;
      width: 24px;
      text-align: center;
      color: #0d6efd;
    }

    .option-item span {
      color: #212529;
    }

    .option-item:hover {
      background-color: #f8f9fa;
    }

    .option-item.selected {
      background-color: #e7f1ff;
      font-weight: 500;
    }

    .hidden-select {
      display: none;
    }

    .form-control {
      border-radius: 8px;
      padding: 12px 15px;
      border: 1px solid #ced4da;
    }

    .form-control:focus {
      border-color: #0d6efd;
      box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
    }

    .btn-custom {
      border-radius: 8px;
      font-weight: bold;
      padding: 12px;
      font-size: 1.1rem;
    }

    .password-wrapper {
      position: relative;
    }

    .password-wrapper input {
      padding-right: 45px;
    }

    .toggle-password {
      position: absolute;
      right: 12px;
      top: 50%;
      transform: translateY(-50%);
      cursor: pointer;
      color: #6c757d;
      font-size: 18px;
      transition: color 0.3s;
      z-index: 5;
    }

    .toggle-password:hover {
      color: #0d6efd;
    }

    @keyframes aparecer {
      0% {
        opacity: 0;
        transform: translateY(-50px);
      }
      100% {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 480px) {
      .login-box {
        padding: 20px 25px 30px;
      }
      .login-header img {
        max-width: 180px;
      }
      .back-arrow {
        left: 20px;
        top: 20px;
        font-size: 24px;
        width: 45px;
        height: 45px;
      }
    }