:root {
    --bg: #0f172a;
    --card: #111827;
    --soft: #1f2937;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --brand: #089e79;
    --brand-darker: #057b5e;
    --brand-2: #06b6d4;
    --radius: 14px;
    --shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
    --max: 1100px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    background: linear-gradient(180deg, #0b1024 0%, #0f172a 30%, #0b1323 100%);
    color: var(--text);
    font:
        18px/1.8 system-ui,
        Verdana,
        -apple-system,
        Segoe UI,
        Roboto,
        Inter,
        "Helvetica Neue",
        Arial;
}

a {
    color: var(--brand-2);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

nav a:hover {
    text-decoration: none;
}

.container {
    max-width: var(--max);
    margin: auto;
    padding: 0 20px;
}

header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: saturate(1.2) blur(8px);
    background: rgba(15, 23, 42, 0.6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav {
    display: flex;
    gap: 14px;
    align-items: center;
    justify-content: space-between;
    padding: 10px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    /* background: radial-gradient(120% 120% at 30% 20%, var(--brand) 0%, var(--brand-2) 40%, #0ea5e9 100%); */
    background: #f7fafc;
    /* box-shadow:
        0 4px 14px rgba(34, 197, 94, 0.4),
        inset 0 0 12px rgba(255, 255, 255, 0.3); */
}

.brand h1 {
    font-size: 16px;
    margin: 0;
    font-weight: 400;
    letter-spacing: 0.2px;
}

.brand img {
    width: 100%;
    max-width: 100%;
}

@media (max-width: 860px) {
    .logo {
        width: 86px;
        height: 78px;
    }
}

@media (max-width: 405px) {
    .logo {
        width: 86px;
        height: 54px;
    }
}

nav ul {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
}

nav a,
#themeToggle {
    display: inline-block;
    padding: 8px 12px;
    border-radius: 999px;
    color: var(--text);
    box-shadow: none;
}

nav a:hover,
#themeToggle:hover {
    background: rgba(255, 255, 255, 0.08);
}

header nav a {
    display: inline-block;
    padding: 8px 12px;
    border-radius: 999px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.hero {
    padding: 54px 0 22px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background:
        radial-gradient(600px 160px at 30% -20%, rgba(34, 197, 94, 0.2), transparent 70%),
        radial-gradient(600px 160px at 90% 0%, rgba(6, 182, 212, 0.2), transparent 70%);
}

.hero-body {
    max-width: 570px;
    margin: auto;
    grid-area: col2;
}

.hero .inner {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    grid-template-areas: "col1 col2";
    gap: 26px;
    align-items: center;
}

@media (max-width: 900px) {
    .hero .inner {
        grid-template-columns: 1fr;
        grid-template-areas:
            "col2"
            "col1";
    }
}

/* Banner del hero (cuadrado y responsive) */
.hero-banner {
    padding: 0;
    overflow: hidden;
    grid-area: col1;
}

.hero-banner img {
    display: block;
    width: 100%;
    object-fit: cover;
}

/* Utilidad de accesibilidad para figcaption oculto visualmente */
.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.eyebrow {
    display: inline-flex;
    gap: 8px;
    align-items: center;
    font-weight: 600;
    color: var(--muted);
    letter-spacing: 0.4px;
}

.tag {
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.03);
}

.line-through {
    text-decoration: line-through;
    text-decoration-thickness: 1px;
}

h2.big {
    font-size: clamp(26px, 4.4vw, 40px);
    line-height: 1.15;
    margin: 10px 0 1.5rem;
}

.hero h2,
.hero p {
    text-transform: uppercase;
    font-weight: lighter;
    letter-spacing: 2px;
    line-height: 1;
    text-align: center;
}

p.lead {
    font-size: clamp(15px, 2.3vw, 18px);
    color: #d1d5db;
    margin: 0 0 1.5rem;
}

.cta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
    color: var(--text);
    text-decoration: none;
    box-shadow: var(--shadow);
    cursor: pointer;
}

.btn:hover {
    text-decoration: none;
}

.btn--primary {
    background: linear-gradient(180deg, var(--brand) 0%, var(--brand-darker) 100%);
    color: #07110a;
    border: none;
}

section {
    padding: 28px 0;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 14px;
    flex-wrap: wrap;
}

.section-title h3 {
    font-size: 22px;
    margin: 0;
}

.badge {
    padding: 4px 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--muted);
    font-size: 12px;
}

.card {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
}

/* Acordeón */
details.accordion {
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.03);
}

details.accordion + details.accordion {
    margin-top: 10px;
}

summary {
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 4px;
    font-weight: 700;
}

summary::-webkit-details-marker {
    display: none;
}

summary .chev {
    transition: transform 0.25s ease;
}

details[open] summary .chev {
    transform: rotate(90deg);
}

.content {
    color: #dbe2ea;
    padding: 8px 2px 12px;
    border-top: 1px dashed rgba(255, 255, 255, 0.08);
}

.content p {
    margin: 0.4rem 0;
}

.content ul,
.content ol {
    margin: 0.4rem 0 0.6rem 1.2rem;
}

footer {
    margin-top: 28px;
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--muted);
    font-size: 14px;
}

.small {
    font-size: 13px;
    color: var(--muted);
}

/* =========================================================
   Accesibilidad: foco visible
   ========================================================= */
:focus-visible {
    outline: 3px solid rgba(6, 182, 212, 0.7); /* basado en --brand-2 */
    outline-offset: 2px;
}

/* =========================================================
   Tema CLARO (activar con <html data-theme="light">)
   ========================================================= */
:root[data-theme="light"] {
    --bg: #f7fafc; /* fondo base */
    --card: #ffffff;
    --soft: #f1f5f9;
    --text: #0f172a; /* texto principal */
    --muted: #475569; /* texto secundario */
    --brand: #089e79; /* verde 600 */
    --brand-2: #0891b2; /* cyan 700 */
}

/* Fondo general y texto */
:root[data-theme="light"] body {
    background: linear-gradient(180deg, #ebebeb 0%, #f7fafc 40%, #edf2f7 100%);
    color: var(--text);
}

/* Links */
:root[data-theme="light"] a {
    color: var(--brand-2);
}

/* Header y navegación */
:root[data-theme="light"] header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    backdrop-filter: saturate(1.2) blur(8px);
}
:root[data-theme="light"] nav a {
    color: var(--text);
}
:root[data-theme="light"] header nav a {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.06);
    color: var(--text);
}
:root[data-theme="light"] nav a:hover {
    background: rgba(0, 0, 0, 0.06);
}

/* Hero */
:root[data-theme="light"] .hero {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    background:
        none;
}
:root[data-theme="light"] .tag {
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(0, 0, 0, 0.03);
}
:root[data-theme="light"] p.lead {
    color: #202020; /* 70% */
}

/* Botones */
:root[data-theme="light"] .btn {
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.04), rgba(0, 0, 0, 0.02));
    color: var(--text);
}
:root[data-theme="light"] .btn--primary {
    background: linear-gradient(180deg, var(--brand) 0%, var(--brand-darker) 100%);
    color: #ffffff;
}

/* Cards y badges */
:root[data-theme="light"] .card {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.03), rgba(0, 0, 0, 0.015));
    border: 1px solid rgba(0, 0, 0, 0.08);
}
:root[data-theme="light"] .badge {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.08);
    color: var(--muted);
}

/* Acordeón */
:root[data-theme="light"] details.accordion {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.08);
}
:root[data-theme="light"] .content {
    color: #0f172acc;
    border-top: 1px dashed rgba(0, 0, 0, 0.08);
}

/* Footer */
:root[data-theme="light"] footer {
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    color: var(--muted);
}

/* Tabla de contenidos */
.toc {
    margin-top: 14px;
}
.toc-title {
    font-size: 16px;
    margin: 0 0 8px;
    font-weight: 700;
    color: var(--text);
}
#toc-list,
#toc-list ol {
    margin: 0;
    padding-left: 1.25rem;
}
#toc-list li {
    margin: 4px 0;
    list-style: none;
}
#toc-list a {
    text-decoration: none;
}
#toc-list a:hover {
    text-decoration: underline;
}

/* Scroll suave para anclas */
html {
    scroll-behavior: smooth;
}

/* === Menú móvil (hamburguesa) === */
/* Botón hamburguesa */
.hamburger {
    display: none; /* visible solo en móvil */
    position: relative;
    width: 44px;
    height: 44px;
    padding: 0 10px;
    justify-content: center;
    align-items: center;
}

.hamburger-box {
    width: 24px;
    height: 16px;
    display: inline-block;
    position: relative;
}
.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
    width: 24px;
    height: 2px;
    background: var(--text);
    position: absolute;
    left: 0;
    content: "";
    transition:
        transform 0.25s ease,
        opacity 0.2s;
}
.hamburger-inner {
    top: 50%;
    transform: translateY(-50%);
}
.hamburger-inner::before {
    top: -7px;
}
.hamburger-inner::after {
    top: 7px;
}

/* estado abierto (animación a "X") */
.hamburger[aria-expanded="true"] .hamburger-inner {
    transform: translateY(-50%) rotate(45deg);
}
.hamburger[aria-expanded="true"] .hamburger-inner::before {
    transform: rotate(-90deg) translateX(-7px);
}
.hamburger[aria-expanded="true"] .hamburger-inner::after {
    opacity: 0;
    transform: translateY(-7px);
}

/* Panel de navegación móvil */
@media (max-width: 860px) {
    /* Oculta la lista en móvil por defecto */
    #primaryNav ul {
        display: none;
    }

    /* Muestra el botón hamburguesa en móvil */
    .hamburger {
        display: inline-flex;
    }

    /* Dropdown del menú */
    .nav {
        position: relative;
    }
    #primaryNav.is-open ul {
        display: flex;
        position: absolute;
        right: 12px;
        left: 12px;
        top: calc(100% + 8px); /* debajo del header */
        flex-direction: column;
        flex-wrap: nowrap;
        gap: 8px;
        padding: 12px;
        border-radius: 12px;
        background: var(--card);
        border: 1px solid rgba(255, 255, 255, 0.08);
        box-shadow: var(--shadow);
        z-index: 60;
    }

    #primaryNav.is-open a {
        display: block;
        padding: 10px 12px;
        border-radius: 10px;
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.06);
    }

    /* Variante tema claro para los enlaces del panel */
    :root[data-theme="light"] #primaryNav.is-open a {
        /* background: rgba(0, 0, 0, 0.03);
        border-color: rgba(0, 0, 0, 0.06); */
    }
}

/* Opcional: bloquear scroll del body cuando el menú esté abierto */
body.menu-open {
    overflow: hidden;
}

/* =========================================================
   (Opcional) Impresión: limpia fondos y sombras
   ========================================================= */
@media print {
    /* Mantén tipografía y color legibles sin borrar todo el diseño */
    html,
    body {
        background: #ffffff !important;
        color: #000 !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        font-size: 12pt;
    }

    /* Oculta solo lo accesorio */
    nav,
    .btn,
    #themeToggle {
        display: none !important;
    }

    /* Mantén header y hero si te gustaba su aspecto impreso
     (si prefieres ocultarlos, añade: header, .hero { display:none !important; }) */

    /* Bordes/ sombras suaves para que no “ensucie” la hoja */
    .card,
    details.accordion {
        background: #fff !important;
        border: 1px solid #e5e7eb !important;
        box-shadow: none !important;
    }

    /* Siempre mostrar contenido de los acordeones */
    details.accordion .content {
        display: block !important;
        border-top: 1px solid #e5e7eb !important;
        padding-top: 6px;
        margin-top: 4px;
    }

    /* Quita el triángulo del summary y deja el título limpio */
    summary::-webkit-details-marker {
        display: none !important;
    }
    summary {
        cursor: default !important;
        font-weight: 700;
        color: #000 !important;
    }

    /* Evita que un acordeón se corte entre páginas */
    details.accordion {
        break-inside: avoid;
        page-break-inside: avoid;
    }

    /* Enlaces legibles en papel (muestra la URL) */
    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 10pt;
        color: #555;
    }
}