:root {
    --color-fondo: #0b1020;
    --color-fondo-seccion: #11182b;
    --color-fondo-suave: #1a2340;
    --color-texto: #f5f5f5;
    --color-primario: #4ea8ff;
    --color-secundario: #00c896;
    --color-borde: #2b3555;
    --color-contraste-alto: #ffffff;

    --fuente-base: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* Reset básico */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--fuente-base);
    background-color: var(--color-fondo);
    color: var(--color-texto);
    line-height: 1.6;
}

/* Enlace para saltar contenido */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-contraste-alto);
    color: #000000;
    padding: 8px 16px;
    z-index: 100;
    text-decoration: none;
    font-weight: 600;
}

.skip-link:focus {
    top: 0;
}

/* Encabezado */
.site-header {
    background-color: #050814;
    border-bottom: 1px solid var(--color-borde);
    padding: 1rem 1.5rem;
    display: grid;
    grid-template-columns: 1.5fr auto;
    grid-template-rows: auto auto;
    gap: 0.75rem 1.5rem;
    align-items: center;
}

.logo-area h1 {
    margin: 0;
    font-size: 1.7rem;
    color: var(--color-primario);
    letter-spacing: 0.04em;
}

.logo-area p {
    margin: 0.25rem 0 0;
    font-size: 0.95rem;
    color: #cfd8ff;
}

/* Menú principal */
.menu-toggle {
    justify-self: end;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    border: 1px solid var(--color-borde);
    background-color: transparent;
    color: var(--color-texto);
    cursor: pointer;
    font-size: 1.3rem;
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: none;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.main-nav ul.open {
    display: flex;
}

.main-nav a {
    text-decoration: none;
    color: var(--color-texto);
    font-weight: 600;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    font-size: 0.9rem;
    background-color: #151c33;
}

.main-nav a:hover,
.main-nav a:focus {
    background-color: var(--color-primario);
    color: #000000;
}

/* Buscador */
.search-form {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.search-form label {
    font-size: 0.85rem;
    color: #cfd8ff;
}

.search-form input[type="search"] {
    flex: 1;
    min-width: 160px;
    padding: 0.35rem 0.5rem;
    border-radius: 4px;
    border: 1px solid var(--color-borde);
    background-color: #050814;
    color: var(--color-texto);
}

.search-form button {
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    border: none;
    background-color: var(--color-primario);
    color: #000000;
    cursor: pointer;
    font-weight: 600;
}

/* Breadcrumbs */
.breadcrumbs {
    padding: 0.5rem 1.5rem;
    font-size: 0.85rem;
    color: #cfd8ff;
}

.breadcrumbs ol {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.breadcrumbs a {
    color: var(--color-primario);
    text-decoration: none;
}

/* Secciones generales */
.section {
    padding: 2.5rem 1.5rem;
    border-top: 1px solid var(--color-borde);
    background-color: var(--color-fondo-seccion);
}

/* Hero */
.hero {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1.5fr);
    gap: 1.8rem;
    align-items: center;
}

.hero-texto h2 {
    font-size: 2rem;
    margin-top: 0;
    margin-bottom: 0.75rem;
}

.hero-texto p {
    font-size: 1rem;
    max-width: 40rem;
    color: #dde5ff;
}

.btn-primario {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.7rem 1.3rem;
    background-color: var(--color-secundario);
    color: #000000;
    text-decoration: none;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
}

.btn-primario:hover,
.btn-primario:focus {
    background-color: #00a67f;
}

.hero-imagen img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.hero-imagen figcaption {
    font-size: 0.85rem;
    margin-top: 0.35rem;
    font-style: italic;
    color: #cfd8ff;
}

/* Imagen entre secciones */
.image-break {
    padding: 0;
    margin: 0;
}

.image-break img {
    width: 100%;
    height: auto;
    display: block;
    opacity: 0.9;
}

/* Títulos de sección */
.section h2 {
    margin-top: 0;
    font-size: 1.6rem;
    margin-bottom: 0.75rem;
}

/* Conceptos */
.concepto {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: 10px;
    background-color: var(--color-fondo-suave);
    border: 1px solid var(--color-borde);
}

.concepto h3 {
    margin-top: 0;
    font-size: 1.2rem;
}

.concepto p {
    margin-bottom: 1rem;
}

/* Imágenes en contenido */
.image-space {
    margin: 1.5rem 0;
}

.image-space img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.image-space figcaption {
    font-size: 0.85rem;
    margin-top: 0.4rem;
    color: #cfd8ff;
}

/* Código */
.code-block {
    background: #050814;
    color: #e0e6ff;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
}

/* Recursos */
.recursos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.2rem;
    margin-top: 1.5rem;
}

.recurso {
    padding: 1.2rem;
    border-radius: 10px;
    border: 1px solid var(--color-borde);
    background-color: var(--color-fondo-suave);
}

.recurso h3 {
    margin-top: 0;
}

.recurso a {
    display: inline-block;
    margin-top: 0.6rem;
    color: var(--color-primario);
    text-decoration: none;
    font-weight: 600;
}

/* Pasos */
.steps {
    padding-left: 1.2rem;
}

.steps li {
    margin-bottom: 0.9rem;
}

/* Formulario de participación */
.form-participacion {
    margin-top: 1rem;
    max-width: 650px;
}

.campo-formulario {
    margin-bottom: 1rem;
}

.campo-formulario label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.campo-formulario input,
.campo-formulario textarea,
.campo-formulario select {
    width: 100%;
    padding: 0.55rem 0.6rem;
    border-radius: 6px;
    border: 1px solid var(--color-borde);
    font: inherit;
    background-color: #050814;
    color: var(--color-texto);
}

/* Footer */
.site-footer {
    background-color: #050814;
    border-top: 1px solid var(--color-borde);
    padding: 1.8rem 1.5rem;
}

.footer-contenido {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.footer-titulo {
    margin-top: 0;
    font-size: 1.2rem;
}

.footer-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-nav a {
    text-decoration: none;
    color: #dde5ff;
    font-size: 0.9rem;
}

.footer-copy {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    text-align: center;
    color: #9ca7d9;
}

/* Animaciones de entrada */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.9s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsivo */
@media (min-width: 900px) {
    .main-nav ul {
        display: flex;
        justify-content: flex-end;
    }

    .menu-toggle {
        display: none;
    }

    .search-form {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .site-header {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }

    .hero {
        grid-template-columns: 1fr;
    }
}