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

html{
    scroll-behavior:smooth;
}

body{
    background:#0f0f12;
    font-family:Georgia, serif;
    color:#2c2c2c;
    padding:50px 20px;
    overflow-x:hidden;
}

/* Fondo de estrellas */
#estrellas{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    z-index:-1;
}

/* Hoja */
.papel{
    max-width:850px;
    margin:auto;
    background:#fffdf7;
    border-radius:20px;
    padding:60px 35px;
    box-shadow:0 20px 50px rgba(0,0,0,.35);
}

/* Título */
h1{
    text-align:center;
    font-size:40px;
    margin-bottom:10px;
    color:#222;
}

/* Subtítulo */
.intro{
    text-align:center;
    color:#666;
    font-style:italic;
    margin-bottom:50px;
}

/* Bloques */
.bloque{
    opacity:0;
    transform:translateY(40px);
    transition:opacity .8s ease, transform .8s ease;
    margin-bottom:40px;
}

.bloque.visible{
    opacity:1;
    transform:translateY(0);
}

/* Texto */
p{
    font-size:20px;
    line-height:1.9;
    color:#333;
}

/* Foto */
.foto{
    display:block;
    width:100%;
    max-width:420px;
    margin:0 auto;
    border-radius:18px;
    box-shadow:0 15px 35px rgba(0,0,0,.25);
}

/* Final */
.final{
    text-align:center;
    margin-top:70px;
}

.final h2{
    margin-top:15px;
    color:#222;
}

/* Corazón */
.corazon{
    font-size:60px;
    animation:latido 1.2s infinite;
}

@keyframes latido{
    0%{
        transform:scale(1);
    }
    50%{
        transform:scale(1.15);
    }
    100%{
        transform:scale(1);
    }
}