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

body {
    background: linear-gradient(120deg, #eef2f3, #dfe9f3);
    color: #2c3e50;
    min-height: 100vh;
}

/* Portada */
.hero {
    text-align: center;
    padding: 80px 20px;
    background: #ffffff;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.hero h1 {
    font-size: 42px;
}

.hero p {
    font-style: italic;
    margin-top: 10px;
    color: #5f6f7a;
}

/* Contenido */
.contenido {
    max-width: 900px;
    margin: 60px auto;
    padding: 0 20px;
    display: grid;
    gap: 40px;
}

/* Tarjetas */
.card {
    background: #fffaf3;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

/* Imagen */
.imagen {
    width: 100%;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

/* Texto */
.card h2 {
    margin-bottom: 15px;
    font-size: 28px;
}

.card p {
    line-height: 1.8;
    text-align: justify;
    color: #444;
}

/* Botón Regresar */
.btn-regresar {
    position: fixed;
    bottom: 30px;
    left: 30px;
    background: #eaf4f4;
    color: #2c3e50;
    border: none;
    padding: 12px 22px;
    border-radius: 30px;
    font-size: 16px;
    cursor: pointer;
    box-shadow: 0 8px 15px rgba(0,0,0,0.15);
    transition: all 0.3s ease;
}

.btn-regresar:hover {
    background: #d0ebeb;
    transform: translateY(-3px);
    box-shadow: 0 12px 20px rgba(0,0,0,0.2);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px;
    color: #777;
}