/* Configuración General - Deep Blue Tech */
body {
    background-color: #000814;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100%25' height='100%25' viewBox='0 0 1600 800'%3E%3Cg %3E%3Cpolygon fill='%23001d3d' points='1600 160 0 460 0 350 1600 50'/%3E%3Cpolygon fill='%23003566' points='1600 260 0 560 0 450 1600 150'/%3E%3Cpolygon fill='%2300509d' points='1600 360 0 660 0 550 1600 250'/%3E%3Cpolygon fill='%230071bc' points='1600 460 0 760 0 650 1600 350'/%3E%3Cpolygon fill='%2300a8e8' points='1600 800 0 800 0 750 1600 450'/%3E%3C/g%3E%3C/svg%3E");
    background-attachment: fixed;
    background-size: cover;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 2rem;
    color: #ffffff;
}

/* Botón Home - Estilo neón */
.btn-home {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    width: 50px;
    height: 50px;
    border: 2px solid #00d4ff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #001d3d;
    text-decoration: none;
    transition: all 0.3s ease;
    z-index: 100;
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.btn-home svg {
    fill: #00d4ff;
}

.btn-home:hover {
    transform: scale(1.1);
    background-color: #00d4ff;
    box-shadow: 0 0 25px #00d4ff;
}

.btn-home:hover svg {
    fill: #001d3d;
}

/* ============================================
   ESTILOS SEMÁNTICOS SIMPLIFICADOS
   ============================================ */

/* MAIN - Contenedor principal */
main {
    max-width: 1200px;
    margin: 0 auto;
    background: rgba(0, 29, 61, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 2px solid rgba(0, 212, 255, 0.2);
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

/* HEADER - Encabezado principal */
header {
    background: linear-gradient(135deg, #001d3d, #000814);
    padding: 2rem;
    text-align: center;
    border-bottom: 3px solid #00d4ff;
}

header h1 {
    font-size: 3rem;
    color: #00d4ff;
    margin: 0;
    text-shadow: 0 0 15px rgba(0, 212, 255, 0.5);
}

header h2 {
    font-size: 1.2rem;
    color: #e0f7fa;
    margin: 0.5rem 0 0;
    font-weight: normal;
    opacity: 0.9;
}

/* SECTION - Secciones */
section {
    padding: 2rem;
    border-bottom: 1px solid rgba(0, 212, 255, 0.2);
}

section:last-of-type {
    border-bottom: none;
}

/* ARTICLE - Artículos (destacados en neón) */
article {
    background: rgba(0, 0, 0, 0.4);
    border-left: 4px solid #00d4ff;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

article:hover {
    background: rgba(0, 212, 255, 0.1);
    transform: translateX(5px);
}

article h3, article h4 {
    color: #00d4ff;
    margin-top: 0;
    margin-bottom: 1rem;
}

article p {
    color: #b0bec5;
    line-height: 1.6;
    margin: 0;
}

/* FIGURE - Imágenes con marco */
figure {
    margin: 1.5rem 0;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    text-align: center;
    border: 1px solid rgba(0, 212, 255, 0.3);
}

figure img {
    max-width: 100%;
    border-radius: 8px;
}

figcaption {
    color: #00d4ff;
    font-size: 0.9rem;
    margin-top: 0.5rem;
    font-style: italic;
}

/* ASIDE - Barra lateral (estilo destacado) */
aside {
    background: linear-gradient(135deg, #001d3d, #000814);
    border: 1px solid #00d4ff;
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.2);
}

aside h4 {
    color: #00d4ff;
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

aside p {
    color: #b0bec5;
    margin: 0;
}

aside ul {
    list-style: none;
    padding: 0;
}

aside li {
    margin: 0.5rem 0;
    padding: 0.5rem;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 6px;
}

aside a {
    color: #00d4ff;
    text-decoration: none;
}

aside a:hover {
    text-decoration: underline;
}

/* FOOTER - Pie de página */
footer {
    background: #000814;
    padding: 1.5rem;
    text-align: center;
    border-top: 2px solid #00d4ff;
    color: #b0bec5;
    font-size: 0.9rem;
}

/* ============================================
   ETIQUETAS SEMÁNTICAS VISIBLES (opcional)
   ============================================ */

/* Muestra el nombre de la etiqueta (útil para aprender) */
main, header, section, article, aside, footer {
    position: relative;
}

main::before {
    content: "<main>";
    position: absolute;
    top: 10px;
    right: 20px;
    background: #00d4ff;
    color: #000814;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-family: monospace;
    font-weight: bold;
    z-index: 10;
}

header::before {
    content: "<header>";
    position: absolute;
    top: 10px;
    right: 20px;
    background: #00d4ff;
    color: #000814;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-family: monospace;
    font-weight: bold;
}

section::before {
    content: "<section>";
    position: absolute;
    top: -10px;
    left: 20px;
    background: #00d4ff;
    color: #000814;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-family: monospace;
    font-weight: bold;
}

article::before {
    content: "<article>";
    position: absolute;
    top: -10px;
    left: 20px;
    background: #ff6b6b;
    color: #000814;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-family: monospace;
    font-weight: bold;
}

aside::before {
    content: "<aside>";
    position: absolute;
    top: -10px;
    right: 20px;
    background: #ffd93d;
    color: #000814;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-family: monospace;
    font-weight: bold;
}

footer::before {
    content: "<footer>";
    position: absolute;
    top: -12px;
    left: 20px;
    background: #6c5ce7;
    color: #ffffff;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-family: monospace;
    font-weight: bold;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    section {
        padding: 1rem;
    }
    
    article {
        padding: 1rem;
    }
}