:root {
      --color-principal: #1265a6;
      --color-oscuro: #1b1d39;
      --color-intermedio: #1c355e;
      --color-gris: #706f6f;
      --blanco-transparente: rgba(255, 255, 255, 0.1);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Poppins', sans-serif;
    }

    body {
      min-height: 100vh;
      background: linear-gradient(-45deg, var(--color-oscuro), var(--color-intermedio), var(--color-principal), var(--color-oscuro));
      background-size: 400% 400%;
      animation: gradientAnimation 15s ease infinite;
      display: flex;
      justify-content: center;
      align-items: center;
      flex-direction: column;
      color: #fff;
      padding: 1rem;
    }

    @keyframes gradientAnimation {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    .menu {
      width: 100%;
      max-width: 1200px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 2rem;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
    }

    #menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    #menu-toggle span {
      height: 3px;
      width: 25px;
      background: white;
      border-radius: 5px;
      transition: 0.3s;
    }

    #menu-toggle.open span:nth-child(1) {
      transform: rotate(45deg) translateY(8px);
    }

    #menu-toggle.open span:nth-child(2) {
      opacity: 0;
    }

    #menu-toggle.open span:nth-child(3) {
      transform: rotate(-45deg) translateY(-8px);
    }

    #nav {
      display: flex;
      gap: 1rem;
    }

    #nav a {
      color: white;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.3s;
    }

    #nav a:hover {
      color: var(--color-principal);
    }

    @media (max-width: 768px) {
      #menu-toggle {
        display: flex;
      }

      #nav {
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.5);
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        padding: 1.5rem 0;
        display: none;
      }

      #nav.active {
        display: flex;
      }
    }

    .login-container {
      width: 100%;
      max-width: 400px;
      padding: 1rem;
    }

    .login-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(16px);
      padding: 2.5rem;
      border-radius: 20px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.4);
      text-align: center;
      animation: fadeIn 1s ease forwards;
      opacity: 0;
      transform: translateY(20px);
    }

    .login-card.animate {
      opacity: 1;
      transform: translateY(0);
    }

    .logo-login {
      width: 120px;
      margin-bottom: 1rem;
      filter: drop-shadow(0 0 5px rgba(0,0,0,0.3));
    }

    .login-card h2 {
      font-weight: 600;
      margin-bottom: 2rem;
    }

    .login-card form {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }

    .login-card input {
      padding: 0.9rem 1rem;
      border: none;
      border-radius: 10px;
      background-color: var(--blanco-transparente);
      color: #fff;
      font-size: 1rem;
      box-shadow: inset 0 0 6px rgba(255,255,255,0.1);
      transition: 0.3s;
    }

    .login-card input:focus {
      outline: 2px solid var(--color-principal);
      background-color: rgba(255,255,255,0.15);
    }

    .login-card input::placeholder {
      color: rgba(255,255,255,0.6);
    }

    .login-card button {
      padding: 0.9rem;
      border-radius: 10px;
      border: none;
      background: linear-gradient(45deg, var(--color-principal), #0e4e84);
      color: #fff;
      font-weight: 600;
      letter-spacing: 0.5px;
      cursor: pointer;
      transition: background 0.3s, transform 0.2s;
    }

    .login-card button:hover {
      background: linear-gradient(45deg, #0e4e84, var(--color-principal));
      transform: translateY(-2px);
    }

    @keyframes fadeIn {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @media (max-width: 500px) {
      .login-card {
        padding: 2rem;
      }
    }