/* ------------------  ESTILOS GENERALES ------------------ */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');

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

body {
    font-family: 'Poppins', sans-serif;
    background: #000010;
    color: #fff;
    line-height: 1.6;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ------------------  ENCABEZADO ------------------ */
header {
    background-color: #0a001a;
    text-align: center;
    padding: 20px;
    border-bottom: 3px solid #00f0ff;
    box-shadow: 0 0 15px #00f0ff;
}

header h1 {
    font-size: 2.5rem;
    color: #ff00ff;
    text-shadow: 0 0 5px #ff00ff, 0 0 10px #ff33ff, 0 0 20px #ff66ff;
}

nav {
    margin-top: 10px;
}

.btn-volver {
    display: inline-block;
    padding: 10px 20px;
    background: transparent;
    color: #00f0ff;
    font-weight: bold;
    font-size: 1.1rem;
    border: 2px solid #00f0ff;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.3s ease;
    text-decoration: none;
    box-shadow: 0 0 8px #00f0ff;
}

.btn-volver:hover {
    background: #00f0ff;
    color: #000010;
    box-shadow: 0 0 20px #00f0ff, 0 0 40px #00ffff;
}

/* ------------------  CONTENIDO PRINCIPAL ------------------ */
main {
    flex: 1;
    padding: 30px 20px;
    max-width: 800px;
    margin: 0 auto;
}

/* Secciones con efecto de tarjetas neón */
section {
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 0 10px #00f0ff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

section:hover {
    transform: scale(1.02);
    box-shadow: 0 0 20px #00f0ff, 0 0 40px #ff00ff;
}

/* ------------------  TITULOS ------------------ */
h2, h3 {
    color: #00f0ff;
    text-shadow: 0 0 5px #00f0ff, 0 0 15px #00f0ff, 0 0 25px #00ffff;
    margin-bottom: 10px;
}

/* ------------------  LISTAS ------------------ */
ul {
    list-style: none;
    padding-left: 0;
}

.lista-palabras ul li,
.actividad ul li {
    font-size: 1.1rem;
    margin: 8px 0;
    padding: 6px 10px;
    background-color: rgba(0, 240, 255, 0.05);
    border-left: 4px solid #ff00ff;
    border-radius: 8px;
    box-shadow: 0 0 8px #ff00ff;
    transition: 0.3s ease;
}

.lista-palabras ul li:hover,
.actividad ul li:hover {
    transform: translateX(8px);
    background-color: rgba(255, 0, 255, 0.1);
    box-shadow: 0 0 15px #ff00ff;
}

/* ------------------  BOTONES ------------------ */
.btn {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    font-size: 1.2rem;
    font-weight: bold;
    border: 2px solid #ff00ff;
    color: #ff00ff;
    background: transparent;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 10px #ff00ff;
}

.btn:hover {
    background-color: #ff00ff;
    color: #000010;
    box-shadow: 0 0 20px #ff00ff, 0 0 40px #ff33ff;
}

/* ------------------  PIE DE PÁGINA ------------------ */
footer {
    text-align: center;
    padding: 15px;
    background: #0a001a;
    font-size: 0.9rem;
    color: #aaa;
    border-top: 3px solid #00f0ff;
    box-shadow: 0 0 15px #00f0ff;
}

/* ------------------  RESPONSIVIDAD ------------------ */
@media (max-width: 600px) {
    header h1 {
        font-size: 1.8rem;
    }

    main {
        padding: 20px 15px;
    }

    .btn-volver, .btn {
        font-size: 1rem;
        padding: 8px 15px;
    }

    .lista-palabras ul li,
    .actividad ul li {
        font-size: 1rem;
    }
}