/* =========================
   RESET
========================= */

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

html{
    scroll-behavior:smooth;
}

body{
    font-family: Arial, Helvetica, sans-serif;
    background:#f5f7fa;
    color:#222;
    line-height:1.6;
}

/* =========================
   HEADER
========================= */

header{
    background:#111827;
    padding:20px 40px;
    position:sticky;
    top:0;
    z-index:1000;
    box-shadow:0 2px 10px rgba(0,0,0,0.15);
}

header nav ul{
    display:flex;
    justify-content:center;
    gap:25px;
    list-style:none;
}

header nav ul li a{
    color:white;
    text-decoration:none;
    font-weight:bold;
    font-size:15px;
    transition:0.3s;
}

header nav ul li a:hover{
    color:#38bdf8;
}

/* =========================
   MAIN
========================= */

main{
    width:90%;
    max-width:1100px;
    margin:40px auto;
}

/* =========================
   TITULOS
========================= */

h1{
    font-size:42px;
    text-align:center;
    margin-bottom:30px;
    color:#111827;
}

h2{
    font-size:28px;
    margin-bottom:15px;
    color:#0f172a;
    border-left:6px solid #38bdf8;
    padding-left:12px;
}

h3{
    margin:20px 0 10px;
    color:#334155;
}

/* =========================
   SECCIONES
========================= */

section{
    background:white;
    margin-bottom:35px;
    padding:30px;
    border-radius:18px;
    box-shadow:0 5px 20px rgba(0,0,0,0.08);
}

/* =========================
   TEXTOS
========================= */

p{
    font-size:17px;
    margin-top:10px;
    color:#444;
}

ul{
    margin-top:10px;
    padding-left:25px;
}

ul li{
    margin-bottom:8px;
}

/* =========================
   IMAGENES
========================= */

img{
    width:100%;
    max-width:500px;
    border-radius:15px;
    display:block;
    margin:20px auto;
    box-shadow:0 4px 15px rgba(0,0,0,0.15);
}

img:hover{
    transform:scale(1.02);
}

/* =========================
   FOTO PRINCIPAL
========================= */

main > div img{
    max-width:230px;
    border-radius:50%;
    border:5px solid #38bdf8;
}

/* =========================
   FOOTER
========================= */

footer{
    background:#111827;
    color:white;
    padding:40px 20px;
    margin-top:50px;
}

footer nav ul{
    display:flex;
    justify-content:center;
    gap:20px;
    list-style:none;
    margin-bottom:20px;
}

footer nav ul li a{
    color:#38bdf8;
    text-decoration:none;
    font-weight:bold;
}

footer p{
    max-width:1000px;
    margin:auto;
    text-align:center;
    color:#cbd5e1;
    font-size:14px;
}

/* =========================
   RESPONSIVE - MOVIL
========================= */

@media(max-width:768px){

    h1{
        font-size:30px;
    }

    h2{
        font-size:22px;
    }

    section{
        padding:20px;
    }

    header nav ul{
        flex-direction:column;
        align-items:center;
        gap:15px;
    }

    img{
        width:100%;
    }

}