/* =========================================================================
   BLOG — hoja compartida de artículos (modo LIGHT)
   Paleta slate del sitio: --accent-500 #334155. Los artículos se leen en
   claro; la landing define los tokens canónicos (index.html).
   ========================================================================= */

:root {
    /* Tipografía */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body:    'DM Sans', system-ui, sans-serif;
    --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

    /* Paleta slate (light) */
    --accent-300: #94a3b8;
    --accent-400: #64748b;
    --accent-500: #334155;   /* BASE — Pizarra */
    --accent-600: #1e293b;
    --accent-800: #0f172a;   /* bloques de código */

    --surface-0: #fafafa;
    --surface-1: #f4f4f5;
    --surface-2: #e4e4e7;
    --border:    #e4e4e7;
    --border-strong: #d4d4d8;

    --text-primary:   #18181b;
    --text-secondary: #52525b;
    --text-tertiary:  #71717a;

    /* Métrica de lectura */
    --prose-width: 680px;
    --wide-width: 860px;

    --radius-sm: 8px;
    --radius-md: 12px;

    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ── Reset mínimo ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 1.0625rem;               /* 17px */
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--surface-0);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

@media (min-width: 720px) {
    body { font-size: 1.125rem; }       /* 18px en pantallas amplias */
}

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

a { color: var(--accent-500); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible {
    outline: 2px solid var(--accent-500);
    outline-offset: 3px;
    border-radius: 2px;
}

::selection { background: var(--accent-500); color: #ffffff; }

/* ── Topbar sticky ────────────────────────────────────────────────────── */
.topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 250, 250, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

.topbar__inner {
    max-width: var(--wide-width);
    margin: 0 auto;
    padding: 0.9rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar__back {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
}

.topbar__back:hover { text-decoration: none; color: var(--accent-500); }

.topbar__back .topbar__arrow {
    display: inline-block;
    transition: transform 300ms var(--ease-out);
    margin-right: 0.35rem;
}

.topbar__back:hover .topbar__arrow { transform: translateX(-3px); }

.topbar__section {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.topbar__section:hover { color: var(--text-primary); text-decoration: none; }
.topbar__section[aria-current="page"] { color: var(--accent-500); }

/* ── Cabecera de artículo ─────────────────────────────────────────────── */
.article-header {
    max-width: var(--prose-width);
    margin: 0 auto;
    padding: clamp(3.5rem, 3rem + 4vw, 6rem) 1.5rem 0;
}

.article-header__label {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-400);
}

.article-header__title {
    font-family: var(--font-display);
    font-variant-numeric: lining-nums;
    font-weight: 700;
    font-size: clamp(2rem, 1.5rem + 2.8vw, 3.2rem);
    line-height: 1.12;
    letter-spacing: -0.02em;
    margin: 1rem 0 1.25rem;
    text-wrap: balance;
}

.article-header__summary {
    font-size: clamp(1.1rem, 1rem + 0.5vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 56ch;
}

.article-header__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    margin-top: 1.75rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* ── Cuerpo de artículo ───────────────────────────────────────────────── */
.article {
    max-width: var(--prose-width);
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.article > * + * { margin-top: 1.4em; }

.article h2 {
    font-family: var(--font-display);
    font-variant-numeric: lining-nums;
    font-weight: 700;
    font-size: clamp(1.5rem, 1.3rem + 1vw, 1.9rem);
    line-height: 1.25;
    letter-spacing: -0.015em;
    margin-top: 2.6em;
}

.article h3 {
    font-family: var(--font-display);
    font-variant-numeric: lining-nums;
    font-weight: 600;
    font-size: clamp(1.2rem, 1.1rem + 0.5vw, 1.4rem);
    letter-spacing: -0.01em;
    margin-top: 2em;
}

.article p { color: var(--text-primary); }
.article strong { font-weight: 600; }
.article em { font-style: italic; }

.article ul, .article ol { padding-left: 1.4rem; }
.article li { margin-top: 0.5em; }
.article li::marker { color: var(--accent-400); }

.article hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 3rem auto;
    width: 120px;
}

/* Pull-quote destacada */
.pull-quote {
    margin: 2.5rem 0;
    padding: 0.4rem 0 0.4rem 1.6rem;
    border-left: 3px solid var(--accent-500);
    font-family: var(--font-display);
    font-variant-numeric: lining-nums;
    font-size: clamp(1.25rem, 1.1rem + 0.8vw, 1.55rem);
    font-weight: 500;
    font-style: italic;
    line-height: 1.4;
    letter-spacing: -0.01em;
    color: var(--accent-600);
}

.pull-quote cite {
    display: block;
    margin-top: 0.6rem;
    font-family: var(--font-mono);
    font-style: normal;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-tertiary);
}

/* Código: bloques oscuros sobre página clara */
.article pre {
    background: var(--accent-800);
    color: #e2e8f0;
    border-radius: var(--radius-md);
    padding: 1.4rem 1.6rem;
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.65;
    margin: 2rem 0;
}

.article pre code {
    font-family: var(--font-mono);
    background: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

.article code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.1em 0.35em;
    color: var(--accent-600);
}

/* Comentarios de código (span manual, sin highlighter) */
.article pre .c { color: #94a3b8; }
.article pre .k { color: #7dd3fc; }
.article pre .s { color: #bef264; }

/* Tablas limpias */
.table-wrap { overflow-x: auto; margin: 2rem 0; }

.article table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    line-height: 1.5;
}

.article th {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-align: left;
    color: var(--text-secondary);
    padding: 0.7rem 0.9rem;
    border-bottom: 2px solid var(--border-strong);
    background: var(--surface-1);
}

.article td {
    padding: 0.75rem 0.9rem;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    color: var(--text-primary);
}

.article tbody tr:hover { background: var(--surface-1); }

.article td:first-child { font-weight: 600; white-space: nowrap; }

/* Nota / aside dentro del artículo */
.article .note {
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.2rem 1.4rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 2rem 0;
}

/* ── CTA de cierre ────────────────────────────────────────────────────── */
.article-cta {
    max-width: var(--prose-width);
    margin: 0 auto 4rem;
    padding: 0 1.5rem;
}

.article-cta__box {
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 2rem;
    background: var(--surface-1);
}

.article-cta__title {
    font-family: var(--font-display);
    font-variant-numeric: lining-nums;
    font-weight: 600;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
}

.article-cta__text {
    color: var(--text-secondary);
    font-size: 0.98rem;
    margin-bottom: 1.4rem;
}

.article-cta__actions { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }

.btn-primary {
    display: inline-block;
    background: var(--accent-600);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.7rem 1.4rem;
    border-radius: var(--radius-sm);
    transition: filter 250ms var(--ease-out), transform 250ms var(--ease-out);
}

.btn-primary:hover { filter: brightness(1.25); text-decoration: none; transform: translateY(-1px); }

.text-link {
    position: relative;
    font-weight: 500;
    color: var(--accent-500);
}

.text-link::after {
    content: '';
    position: absolute;
    bottom: -2px; left: 0;
    width: 0; height: 1px;
    background: currentColor;
    transition: width 350ms var(--ease-out);
}

.text-link:hover { text-decoration: none; }
.text-link:hover::after { width: 100%; }

/* ── Índice del blog (cards) ──────────────────────────────────────────── */
.blog-hero {
    max-width: var(--wide-width);
    margin: 0 auto;
    padding: clamp(3.5rem, 3rem + 4vw, 6rem) 1.5rem 1rem;
}

.blog-hero__title {
    font-family: var(--font-display);
    font-variant-numeric: lining-nums;
    font-weight: 700;
    font-size: clamp(2.4rem, 1.8rem + 3vw, 3.6rem);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.blog-hero__tagline {
    margin-top: 1rem;
    font-size: clamp(1.05rem, 1rem + 0.4vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 58ch;
}

.post-list {
    max-width: var(--wide-width);
    margin: 0 auto;
    padding: 2rem 1.5rem 5rem;
    display: grid;
    gap: 1.25rem;
}

.post-card {
    display: block;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: #ffffff;
    padding: 1.8rem 2rem;
    color: inherit;
    transition: border-color 300ms var(--ease-out),
                box-shadow 300ms var(--ease-out),
                transform 300ms var(--ease-out);
}

.post-card:hover {
    text-decoration: none;
    border-color: var(--accent-300);
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
    transform: translateY(-3px);
}

.post-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 0.8rem;
}

.post-card__title {
    font-family: var(--font-display);
    font-variant-numeric: lining-nums;
    font-weight: 700;
    font-size: clamp(1.35rem, 1.2rem + 0.8vw, 1.7rem);
    letter-spacing: -0.015em;
    line-height: 1.2;
    color: var(--text-primary);
}

.post-card:hover .post-card__title { color: var(--accent-500); }

.post-card__summary {
    margin-top: 0.7rem;
    color: var(--text-secondary);
    font-size: 0.98rem;
    max-width: 68ch;
}

.post-card__cta {
    display: inline-block;
    margin-top: 1.1rem;
    font-weight: 500;
    font-size: 0.92rem;
    color: var(--accent-500);
}

/* ── Footer mínimo ────────────────────────────────────────────────────── */
.blog-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 1.5rem 3rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.blog-footer a { color: var(--text-secondary); }

/* ── Responsive fino ──────────────────────────────────────────────────── */
@media (max-width: 640px) {
    .post-card { padding: 1.4rem 1.3rem; }
    .article-cta__box { padding: 1.5rem 1.3rem; }
    .article pre { padding: 1.1rem 1.2rem; border-radius: var(--radius-sm); }
}

/* ── Accesibilidad de movimiento ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}