/* ============================================================
   single.php — Estilos del artículo individual
   DUA NetZero Theme
   ============================================================ */

/* ── Variables (deben coincidir con tu style.css principal) ── */
:root {
    --color-accent:     #98c836;   /* verde DUA */
    --color-accent-dark:#98c836;
    --color-text:       #1a1a1a;
    --color-text-muted: #666;
    --color-border:     #e4e4e4;
    --color-bg:         #ffffff;
    --font-sans:        'Inter', 'Helvetica Neue', Arial, sans-serif;
    --max-width:        900px;
    --spacing-sm:       0.75rem;
    --spacing-md:       1.5rem;
    --spacing-lg:       3rem;
}

/* ── Contenedor ────────────────────────────────────────────── */
.single-container {
    max-width: var(--max-width);
    margin:    0 auto;
    padding:   var(--spacing-md) 1.25rem var(--spacing-lg);
}

/* ── Back link ─────────────────────────────────────────────── */
.single-back {
    margin-bottom: var(--spacing-md);
}

.back-link {
    display:      inline-flex;
    align-items:  center;
    gap:          0.35rem;
    font-size:    0.85rem;
    color:        var(--color-text-muted);
    text-decoration: none;
    transition:   color 0.2s;
}

.back-link:hover {
    color: var(--color-accent);
}

.back-link__arrow {
    font-size: 1rem;
    line-height: 1;
}

/* ── Header del artículo ────────────────────────────────────── */
.single-header {
    margin-bottom: var(--spacing-md);
}

.single-header__title {
    font-family:   var(--font-sans);
    font-size:     45px;
    font-weight:   700;
    line-height:   1.2;
    color:         var(--color-text);
    margin:        0 0 0.6rem;
}

.single-header__meta {
    font-size:  0.82rem;
    color:      #C2CDBA;
    margin-bottom: 0.75rem;
}

/* ── Badge de categoría ─────────────────────────────────────── */
.single-header__cats {
    display:    flex;
    flex-wrap:  wrap;
    gap:        0.4rem;
    margin-top: 0.5rem;
}

.cat-badge {
    display:          inline-block;
    padding:          0.2rem 0.65rem;
    font-size:        12px;
    font-weight:      700;
    letter-spacing:   0.04em;
    text-transform:   capitalize;
    color:            var(--color-accent-dark);
    
    background-color: #f5faeb;
    
    border-radius:    20px;
    text-decoration:  none;
    transition:       background 0.2s, color 0.2s;
}

.cat-badge:hover {
    background: var(--color-accent);
    color:      #fff;
}

/* ── Imagen destacada ────────────────────────────────────────── */
.single-featured-img {
    margin:        0 0 var(--spacing-md);
    border-radius: 8px;
    overflow:      hidden;
    line-height:   0;
}

.single-featured-img__img {
    width:      100%;
    height:     auto;
    max-height: 480px;
    object-fit: cover;
    display:    block;
}

/* ── Barra de meta (Autor / Journal / Publicado) ────────────── */
.single-meta-bar {
    display:        flex;
    gap:            10px;
    padding:        var(--spacing-sm) 0 var(--spacing-sm);
    border-left:    3px solid var(--color-accent);
    padding-left:   var(--spacing-md);
    margin-bottom:  var(--spacing-lg);
    flex-wrap:      wrap;
    flex-direction: column;
}

.single-meta-bar__item {
    display:        flex;
    align-items: center;
    gap:            10px;
}

.single-meta-bar__label {
    font-size:     0.72rem;
    font-weight:   600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color:          var(--color-accent);
}

.single-meta-bar__value {
    font-size: 0.88rem;
    color:     var(--color-text);
}

/* ── Contenido del artículo ─────────────────────────────────── */
.single-content {
    font-family:   var(--font-sans);
    font-size:     1rem;
    line-height:   1.75;
    color:         var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.single-content h2,
.single-content h3,
.single-content h4 {
    font-weight: 700;
    margin:      1.6em 0 0.5em;
    line-height: 1.3;
    color:       var(--color-text);
}

.single-content h2 { font-size: 1.25rem; }
.single-content h3 { font-size: 1.1rem; }

.single-content p {
    margin: 0 0 1.25em;
}

.single-content a {
    color:           var(--color-accent-dark);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset:     2px;
}

.single-content a:hover {
    color: var(--color-accent);
}

.single-content img {
    max-width:     100%;
    height:        auto;
    border-radius: 4px;
    margin:        1rem 0;
}

.single-content blockquote {
    margin:      1.5rem 0;
    padding:     0.75rem 0 0.75rem 1.25rem;
    border-left: 3px solid var(--color-accent);
    color:       var(--color-text-muted);
    font-style:  italic;
}

.single-content ul,
.single-content ol {
    margin:       0 0 1.25em 1.5em;
    padding:      0;
}

.single-content li {
    margin-bottom: 0.4em;
}

/* ── Paginación de páginas internas ─────────────────────────── */
.single-page-links {
    font-size:     0.85rem;
    color:         var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.single-page-links__item {
    display:          inline-block;
    margin:           0 0.25rem;
    padding:          0.2rem 0.5rem;
    border:           1px solid var(--color-border);
    border-radius:    3px;
}

/* ── Footer del artículo ─────────────────────────────────────── */
.single-footer {
    border-top:  1px solid var(--color-border);
    padding-top: var(--spacing-md);
    margin-top:  var(--spacing-md);
}

.btn-pubmed {
    display:          inline-block;
    padding:          0.5rem 1.25rem;
    font-size:        0.82rem;
    font-weight:      500;
    color:            var(--color-text);
    border:           1px solid var(--color-border);
    border-radius:    4px;
    text-decoration:  none;
    transition:       border-color 0.2s, color 0.2s;
}

.btn-pubmed:hover {
    border-color: var(--color-accent);
    color:        var(--color-accent-dark);
}

/* ── Navegación entre posts ──────────────────────────────────── */
.single-post-nav {
    display:        grid;
    grid-template-columns: 1fr 1fr;
    gap:            var(--spacing-md);
   
}

.post-nav-link {
    display:        flex;
    flex-direction: column;
    gap:            0.3rem;
    text-decoration: none;
    color:          var(--color-text);
    transition:     color 0.2s;
}

.post-nav-link--next {
    text-align: right;
}

.post-nav-link:hover {
    color: var(--color-accent-dark);
}

.post-nav-link__direction {
    font-size:  0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color:      var(--color-text-muted);
}

.post-nav-link__title {
    font-size:   0.9rem;
    font-weight: 500;
    line-height: 1.35;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 640px) {
    .single-meta-bar {
        gap: var(--spacing-md);
    }

    .single-post-nav {
        grid-template-columns: 1fr;
    }

    .post-nav-link--next {
        text-align: left;
    }
}