/* ============================================================
   Arkoder — BLOG
   Hoja de estilos autónoma del blog (se carga sola en /blog y
   /en/blog). Reutiliza el mismo sistema de diseño dark de la
   landing (tokens CSS de landing.css) para que encaje con la web.
   ============================================================ */

:root {
    --bg: #05060b;
    --bg-2: #0a0d17;
    --surface: #0d1120;
    --surface-2: #121731;
    --line: rgba(148, 163, 184, .13);
    --line-strong: rgba(148, 163, 184, .26);
    --text: #e6eaf2;
    --muted: #8f99b0;
    --muted-2: #5d677e;
    --green-deep: #0f241b;
    --green-soft: #a7f3d0;
    --emerald-400: #34d399;
    --emerald-500: #10b981;
    --emerald-600: #059669;
    --green: #34d399;
    --mint: #6ee7b7;
    --red: #f87171;
    --amber: #fbbf24;
    --grad: linear-gradient(100deg, #059669 0%, #10b981 45%, #34d399 100%);
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-head: 'Space Grotesk', 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --radius: 18px;
    --maxw: 1180px;
    --nav-h: 76px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

::selection {
    background: rgba(16, 185, 129, .45);
    color: #fff;
}

img,
svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-head);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -.02em;
}

.container {
    width: 100%;
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

/* Fondo decorativo (coincide con la landing) */
.grid-bg {
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background-image: linear-gradient(rgba(148, 163, 184, .045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, .045) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: radial-gradient(ellipse 90% 62% at 50% 0%, #000 25%, transparent 78%);
    mask-image: radial-gradient(ellipse 90% 62% at 50% 0%, #000 25%, transparent 78%);
}

.glow-bg {
    position: fixed;
    inset: 0;
    z-index: -3;
    pointer-events: none;
    background:
        radial-gradient(58% 42% at 50% -6%, rgba(16, 185, 129, .16), transparent 60%),
        radial-gradient(50% 40% at 50% 110%, rgba(52, 211, 153, .06), transparent 65%);
}

/* ============ Botones (idénticos a landing) ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14.5px;
    transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
    white-space: nowrap;
}

.btn-primary {
    color: #fff;
    position: relative;
    background: var(--grad);
    background-size: 150% 150%;
    box-shadow: 0 10px 34px -10px rgba(16, 185, 129, .6), inset 0 1px 0 rgba(255, 255, 255, .22);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 44px -12px rgba(16, 185, 129, .75), inset 0 1px 0 rgba(255, 255, 255, .22);
}

.btn-ghost {
    color: var(--text);
    border: 1px solid var(--line-strong);
    background: rgba(255, 255, 255, .03);
    backdrop-filter: blur(6px);
}

.btn-ghost:hover {
    border-color: rgba(110, 231, 183, .55);
    background: rgba(52, 211, 153, .1);
    transform: translateY(-2px);
}

.btn.disabled {
    opacity: .45;
    cursor: not-allowed;
    transform: none !important;
    pointer-events: none;
}

.btn-block {
    width: 100%;
}

/* ============ Cabecera / navegación ============ */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-h);
    background: rgba(5, 6, 11, .82);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}

.nav-inner {
    height: var(--nav-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-head);
    font-weight: 700;
    font-size: 19px;
    letter-spacing: -.01em;
    flex: none;
    white-space: nowrap;
}

.brand img {
    width: 38px;
    height: auto;
    flex: none;
}

.brand b {
    font-weight: 700;
}

.brand span {
    color: var(--muted);
    font-weight: 500;
}

.nav-derecha {
    display: flex;
    align-items: center;
    gap: 18px;
    flex: 1;
    justify-content: flex-end;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
    list-style: none;
}

.nav-links a {
    font-size: 14.5px;
    font-weight: 500;
    color: var(--muted);
    white-space: nowrap;
    transition: color .2s;
}

.nav-links a:hover,
.nav-links a.on {
    color: var(--text);
}

/* Formulario de búsqueda del blog */
.search {
    display: flex;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    background: rgba(255, 255, 255, .03);
    padding: 4px 6px 4px 14px;
    transition: border-color .2s;
    flex: 0 1 240px;
    min-width: 140px;
}

.search:focus-within {
    border-color: rgba(110, 231, 183, .55);
}

.search input {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
}

.search input::placeholder {
    color: var(--muted-2);
}

.search button {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--grad);
    color: #fff;
    font-size: 15px;
    display: grid;
    place-items: center;
    flex: none;
    transition: filter .2s;
}

.search button:hover {
    filter: brightness(1.1);
}

/* ============ Estructura del contenido ============ */
.blog-main {
    padding: 56px 0 90px;
}

.blog-layout {
    /* El contenido interior define la cuadrícula de columnas */
}

.blog-head {
    margin-bottom: 40px;
    text-align: center;
}

.blog-head h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 10px;
}

.blog-head p {
    color: var(--muted);
    font-size: 17px;
    max-width: 640px;
    margin: 0 auto;
}

/* Dos columnas: contenido + sidebar */
.blog-columns {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 44px;
    align-items: start;
}

/* ============ Tarjetas de posts ============ */
.post-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 26px;
}

.post-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.post-card:hover {
    transform: translateY(-4px);
    border-color: var(--line-strong);
    box-shadow: 0 24px 50px -24px rgba(0, 0, 0, .8);
}

.post-card-img {
    aspect-ratio: 16 / 8;
    overflow: hidden;
    background: var(--surface-2);
}

.post-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}

.post-card:hover .post-card-img img {
    transform: scale(1.04);
}

.post-card-body {
    padding: 22px 24px 24px;
}

.post-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 4px 11px;
    border-radius: 999px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--mint);
    background: rgba(52, 211, 153, .1);
    border: 1px solid rgba(52, 211, 153, .18);
    transition: background .2s, color .2s;
}

.chip:hover {
    background: rgba(52, 211, 153, .2);
    color: var(--green-soft);
}

.post-card-title {
    font-size: 1.35rem;
    margin-bottom: 8px;
}

.post-card-title a {
    transition: color .2s;
}

.post-card-title a:hover {
    color: var(--mint);
}

.post-card-excerpt {
    color: var(--muted);
    font-size: 15px;
}

.post-card-foot {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--line);
    font-size: 13px;
    color: var(--muted-2);
}

.post-card-foot .author {
    color: var(--muted);
    font-weight: 500;
}

.post-card-foot time {
    margin-left: auto;
}

/* ============ Sidebar ============ */
.blog-sidebar {
    position: sticky;
    top: calc(var(--nav-h) + 20px);
    display: grid;
    gap: 20px;
}

.sidebar-block {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
}

.sidebar-block h3 {
    font-size: 13px;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--muted-2);
    margin-bottom: 16px;
}

.sidebar-vacio,
.vacio {
    color: var(--muted);
    font-size: 15px;
    text-align: center;
    padding: 20px;
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius);
}

.sidebar-cats {
    list-style: none;
    display: grid;
    gap: 4px;
}

.sidebar-cats a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 9px 10px;
    border-radius: 10px;
    font-size: 14.5px;
    color: var(--muted);
    transition: background .2s, color .2s;
}

.sidebar-cats a:hover,
.sidebar-cats a.on {
    background: rgba(52, 211, 153, .1);
    color: var(--text);
}

.sidebar-cats .n {
    font-size: 12px;
    color: var(--muted-2);
    background: var(--surface-2);
    border-radius: 999px;
    padding: 2px 9px;
}

.sidebar-block .btn-block {
    margin-top: 4px;
}

/* ============ Paginación ============ */
.paginacion {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-top: 34px;
}

.pag-info {
    color: var(--muted-2);
    font-size: 14px;
}

.result-count {
    color: var(--muted);
    font-size: 14.5px;
    margin-bottom: 18px;
}

/* Centinela del scroll infinito */
.infinite-sentinel {
    height: 1px;
}

.infinite-loading {
    display: grid;
    place-items: center;
    padding: 26px 0;
    color: var(--muted-2);
    font-size: 14px;
}

/* ============ Detalle ============ */
.post-detail {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 40px clamp(24px, 5vw, 60px);
    max-width: 820px;
    margin: 0 auto;
}

.post-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 13.5px;
    color: var(--muted-2);
    margin-bottom: 18px;
}

.post-breadcrumb a {
    color: var(--muted);
    transition: color .2s;
}

.post-breadcrumb a:hover {
    color: var(--mint);
}

.post-breadcrumb .sep {
    color: var(--muted-2);
}

.post-detail-head h1 {
    font-size: clamp(1.9rem, 4.5vw, 2.8rem);
    line-height: 1.12;
    margin-bottom: 18px;
}

.post-detail-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--line);
    font-size: 14px;
    color: var(--muted);
}

.post-detail-meta .author {
    font-weight: 600;
    color: var(--text);
}

.post-detail-meta time {
    color: var(--muted-2);
}

.post-detail-meta .views {
    margin-left: auto;
    color: var(--muted-2);
}

.post-detail-img {
    margin: 26px 0;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--line);
}

.post-detail-img img {
    width: 100%;
}

.post-detail-content {
    font-size: 17px;
    color: var(--text);
    line-height: 1.75;
}

.post-detail-content p {
    margin: 1.1em 0;
}

.post-detail-content h2,
.post-detail-content h3 {
    margin: 1.5em 0 .6em;
}

.post-detail-content h2 {
    font-size: 1.6rem;
}

.post-detail-content h3 {
    font-size: 1.3rem;
}

.post-detail-content ul,
.post-detail-content ol {
    margin: 1em 0;
    padding-left: 24px;
}

.post-detail-content li {
    margin: .35em 0;
}

.post-detail-content a {
    color: var(--mint);
    border-bottom: 1px solid rgba(52, 211, 153, .3);
}

.post-detail-content a:hover {
    color: var(--green-soft);
    border-color: var(--green);
}

.post-detail-content img {
    border-radius: 12px;
    margin: 1.4em auto;
}

.post-detail-content code {
    font-family: var(--font-mono);
    font-size: .9em;
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 2px 6px;
}

.post-detail-content pre {
    background: var(--bg-2);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 18px;
    overflow-x: auto;
    margin: 1.3em 0;
}

.post-detail-content pre code {
    background: transparent;
    border: none;
    padding: 0;
}

.post-detail-content blockquote {
    border-left: 3px solid var(--emerald-500);
    background: rgba(16, 185, 129, .06);
    border-radius: 0 10px 10px 0;
    padding: 14px 18px;
    margin: 1.4em 0;
    color: var(--muted);
}

/* ============ Opt-in newsletter (dentro del contenido) ============
   Bloque de captación reutilizable que se inserta en el HTML del
   content de un post. Diseñado con los tokens del blog para integrarse
   sin desentonar, pero con un acento esmeralda + borde de gradiente que
   lo hace destacar sobre el flujo de lectura.
   Uso: <div class="optin"> … </div>
   ============================================================ */
.post-detail-content .optin {
    margin: 2.2em 0;
    padding: 30px 30px 28px;
    border-radius: 10px;
    background:
        radial-gradient(120% 160% at 100% 0%, rgba(16, 185, 129, .66), transparent 55%),
        linear-gradient(180deg, var(--surface-2), var(--surface));
    border: 1px solid transparent;
    background-clip: padding-box;
    box-shadow: inset 0 0 0 1px var(--line), 0 24px 48px -28px rgba(0, 0, 0, .9);
    border-top: 5px #16bd85 solid;
}

/* Borde superior en gradiente (firma visual de la marca) */
.post-detail-content .optin::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: var(--radius) var(--radius) 0 0;
    background: var(--grad);
    background-size: 150% 150%;
}

.post-detail-content .optin-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 13px;
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: 11.5px;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--mint);
    background: rgba(52, 211, 153, .1);
    border: 1px solid rgba(52, 211, 153, .22);
    margin-bottom: 16px;
}

.post-detail-content .optin-tag svg {
    width: 14px;
    height: 14px;
    flex: none;
}

.post-detail-content .optin h3 {
    font-size: 1.35rem;
    margin: 0 0 8px;
    letter-spacing: -.01em;
}

.post-detail-content .optin h3 .grad {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.post-detail-content .optin p {
    margin: 0 0 18px;
    color: var(--muted);
    font-size: 15.5px;
    max-width: 520px;
}

.post-detail-content .optin form {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.post-detail-content .optin .optin-input {
    flex: 1 1 240px;
    min-width: 0;
    padding: 12px 16px;
    border-radius: 12px;
    background: rgba(5, 6, 11, .55);
    border: 1px solid var(--line-strong);
    color: var(--text);
    font-family: inherit;
    font-size: 15px;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
}

.post-detail-content .optin .optin-input::placeholder {
    color: var(--muted-2);
}

.post-detail-content .optin .optin-input:focus {
    border-color: rgba(110, 231, 183, .6);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, .14);
}

.post-detail-content .optin .optin-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex: none;
    padding: 12px 22px;
    border-radius: 12px;
    font-family: inherit;
    font-weight: 600;
    font-size: 15px;
    color: #fff;
    background: var(--grad);
    background-size: 150% 150%;
    box-shadow: 0 10px 30px -10px rgba(16, 185, 129, .6), inset 0 1px 0 rgba(255, 255, 255, .22);
    transition: transform .25s ease, box-shadow .25s ease, filter .25s ease;
    cursor: pointer;
}

.post-detail-content .optin .optin-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.06);
    box-shadow: 0 16px 38px -12px rgba(16, 185, 129, .75), inset 0 1px 0 rgba(255, 255, 255, .22);
}

/* Estado de envío / campos bloqueados (evita dobles submits) */
.post-detail-content .optin .optin-btn:disabled,
.post-detail-content .optin .optin-input:disabled {
    opacity: .7;
    cursor: not-allowed;
    transform: none;
    filter: none;
}

.post-detail-content .optin .optin-btn svg {
    width: 16px;
    height: 16px;
    flex: none;
}

.post-detail-content .optin .optin-note {
    margin: 14px 0 0;
    font-size: 13px;
    color: var(--muted-2);
    display: flex;
    align-items: center;
    gap: 7px;
}

.post-detail-content .optin .optin-note svg {
    width: 13px;
    height: 13px;
    flex: none;
    color: var(--emerald-500);
}

/* Estado de feedback (éxito / error) usado por el JS futuro */
.post-detail-content .optin-msg {
    display: none;
    margin-top: 14px;
    padding: 11px 15px;
    border-radius: 10px;
    font-size: 14.5px;
    line-height: 1.5;
}

.post-detail-content .optin-msg.ok {
    display: block;
    color: var(--green-soft);
    background: rgba(16, 185, 129, .1);
    border: 1px solid rgba(52, 211, 153, .25);
}

.post-detail-content .optin-msg.err {
    display: block;
    color: #fecaca;
    background: rgba(248, 113, 113, .1);
    border: 1px solid rgba(248, 113, 113, .25);
}

@media (max-width: 640px) {
    .post-detail-content .optin {
        padding: 24px 20px 22px;
    }
}

.post-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--line);
}

.post-detail-back {
    margin-top: 28px;
}

/* ============ 404 ============ */
.blog-error {
    text-align: center;
    padding: 70px 20px;
    max-width: 620px;
    margin: 0 auto;
}

.blog-error .error-code {
    font-family: var(--font-head);
    font-size: clamp(4rem, 14vw, 7rem);
    font-weight: 700;
    line-height: 1;
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 14px;
}

.blog-error h1 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.blog-error p {
    color: var(--muted);
    margin-bottom: 26px;
}

.blog-error .btn {
    margin: 0 6px;
}

/* ============ Pie ============ */
.footer {
    border-top: 1px solid var(--line);
    padding: 60px 0 34px;
    background: rgba(255, 255, 255, .012);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 46px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--muted);
    margin-top: 14px;
    max-width: 300px;
}

.footer h4 {
    font-family: var(--font-head);
    font-size: 13px;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--muted-2);
    margin-bottom: 16px;
}

.footer ul {
    list-style: none;
    display: grid;
    gap: 11px;
}

.footer ul a {
    font-size: 14px;
    color: var(--muted);
    transition: color .2s;
}

.footer ul a:hover {
    color: var(--text);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding-top: 26px;
    border-top: 1px solid var(--line);
    font-size: 13px;
    color: var(--muted-2);
}

/* ============ Responsive ============ */
@media (max-width: 920px) {
    .blog-columns {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .blog-sidebar {
        position: static;
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .nav-derecha {
        gap: 10px;
    }

    .nav-links {
        display: none;
    }

    .search {
        flex: 1 1 auto;
    }

    .nav-derecha .btn-ghost {
        display: none;
    }

    .blog-main {
        padding: 36px 0 70px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}