.portada {
    position: fixed;
    top: 16px;
    left: 16px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 4px 10px rgba(0,0,0,0.25);
    z-index: 9999;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    color: #fff;
    background: linear-gradient(135deg, #5b0b0b 0%, #000000 48%, #ffffff 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-left: 160px;
    padding-top: 40px;
}

.contenedor {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px;
}

.seccion {
    margin-bottom: 32px;
}
.seccion h2 {
    margin: 0 0 16px 0;
    font-size: 1.6rem;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.6);
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.cubo {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.08);
    padding: 18px;
    border-radius: 12px;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: transform 200ms ease, box-shadow 200ms ease;
    box-shadow: 0 6px 18px rgba(0,0,0,0.25);
    backdrop-filter: blur(4px);
}

.bibliografia .cubo {
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
    border-left: 6px solid rgba(200,50,50,0.9);
}

.cubo:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow: 0 14px 30px rgba(0,0,0,0.45);
}

.cubo h3 {
    margin: 0 0 8px 0;
    font-size: 1.1rem;
    color: #fff;
}
.cubo p {
    margin: 0;
    color: rgba(255,255,255,0.85);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero {
    margin-bottom: 20px;
}
.nombre h1 {
    margin: 0 0 6px 0;
    font-size: 2rem;
    color: #fff;
    text-shadow: 0 2px 6px rgba(0,0,0,0.6);
}
.nombre .titulo {
    margin: 0 0 12px 0;
    color: rgba(255,255,255,0.85);
    font-size: 0.95rem;
}

.hero .presentacion {
    width: 100%;
    margin: 12px 0 6px 0;
    padding: 16px;
    background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
    border-left: 6px solid rgba(200,50,50,0.92); 
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    min-height: 80px;
    display: flex;
    align-items: center;
}

.hero .presentacion p {
    margin: 0;
    color: rgba(255,255,255,0.9);
    font-size: 0.98rem;
    line-height: 1.45;
}

.contacto .grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    align-items: stretch;
}

.contacto .cubo {
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100px;
}

.cubo a {
    color: inherit;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.cubo a:hover {
    text-decoration: underline;
}

.cubo .icon {
    display: inline-flex;
    width: 20px;
    height: 20px;
    color: rgba(255,255,255,0.95);
    flex-shrink: 0;
}

.cubo.insta .icon { color: rgba(200,50,50,0.95); }
.cubo.github .icon { color: rgba(255,255,255,0.95); }
.cubo.telefono .icon { color: rgba(220,220,220,0.95); }
.cubo.email .icon { color: rgba(230,230,230,0.95); }


.cubo.insta { border-left-color: rgba(200,50,50,0.95); }
.cubo.github { border-left-color: rgba(255,255,255,0.95); }
.cubo.telefono { border-left-color: rgba(0,0,0,0.6); }
.cubo.email { border-left-color: rgba(200,200,200,0.85); }

@media (max-width: 900px) {
    .grid {
        grid-template-columns: 1fr;
    }
    body {
        padding-left: 110px;
    }
    .contacto .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 480px) {
  .portada {
    width: 80px;
    height: 80px;
    top: 12px;
    left: 12px;
  }
  body {
    padding-left: 100px;
    padding-top: 24px;
    background: linear-gradient(180deg, #5b0b0b 0%, #000000 50%, #ffffff 100%);
  }
  .contacto .grid {
        grid-template-columns: 1fr;
    }
    .hero .presentacion {
        padding: 12px;
        min-height: auto;
    }
}