/* =====================================================
   BLOG — estilos/blog.css
   GEO-optimized blog index page
   ===================================================== */

/* ---- Contenedor principal ---- */
.blog-page {
    width: 100%;
    max-width: 1040px;
    margin: 0 auto;
    padding: 60px 24px 80px;
    flex-grow: 1;
}

/* ---- Breadcrumb ---- */
.blog-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--flex-gray);
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.blog-breadcrumb a {
    color: var(--flex-gray);
    text-decoration: none;
    transition: color 0.2s;
}

.blog-breadcrumb a:hover {
    color: var(--flex-black);
}

.blog-breadcrumb .sep {
    color: var(--flex-border);
}

.blog-breadcrumb .current {
    color: var(--flex-black);
}

/* ---- Cabecera blog ---- */
.blog-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: end;
    gap: 24px;
    margin-bottom: 48px;
}

.blog-badge {
    display: inline-block;
    background: var(--flex-green);
    color: #fff;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 5px 12px;
    border-radius: 99px;
    margin-bottom: 14px;
}

.blog-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.0;
    letter-spacing: -0.04em;
    color: var(--flex-black);
    margin-bottom: 12px;
}

.blog-description {
    font-size: 17px;
    color: var(--flex-gray);
    line-height: 1.6;
    max-width: 560px;
}

.blog-stats {
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-align: right;
    flex-shrink: 0;
}

.blog-stat {
    font-size: 13px;
    color: var(--flex-gray);
    font-weight: 500;
}

.blog-stat strong {
    color: var(--flex-black);
    font-weight: 800;
}

/* ---- Filtros de categoría ---- */
.blog-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid #E5E7EB;
}

.filter-btn {
    padding: 9px 18px;
    font-size: 14px;
    font-weight: 700;
    border-radius: 99px;
    border: 1.5px solid var(--flex-border);
    background: #fff;
    color: var(--flex-gray);
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: -0.01em;
    font-family: 'Inter', sans-serif;
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--flex-black);
    background: var(--flex-black);
    color: #fff;
}

.filter-btn.active-green {
    border-color: var(--flex-green);
    background: var(--flex-green);
    color: #fff;
}

/* ---- Artículo destacado ---- */
.blog-featured {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border-radius: 28px;
    overflow: hidden;
    background: var(--flex-black);
    margin-bottom: 48px;
    min-height: 340px;
    text-decoration: none;
    transition: transform 0.25s, box-shadow 0.25s;
}

.blog-featured:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 48px rgba(5,9,13,0.18);
}

.blog-featured-img {
    background: #1a1f27;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 72px;
    min-height: 260px;
    position: relative;
    overflow: hidden;
}

.blog-featured-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.blog-featured-img .placeholder-emoji {
    font-size: 72px;
}

.blog-featured-body {
    padding: 40px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: #fff;
}

.blog-featured-cat {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--flex-green);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.blog-featured-cat::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 2px;
    background: var(--flex-green);
}

.blog-featured-title {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 16px;
    color: #fff;
}

.blog-featured-excerpt {
    font-size: 15px;
    color: rgba(255,255,255,0.65);
    line-height: 1.65;
    margin-bottom: 28px;
    flex-grow: 1;
}

.blog-featured-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    color: rgba(255,255,255,0.45);
    font-weight: 500;
}

.blog-featured-cta {
    font-size: 13px;
    font-weight: 700;
    color: var(--flex-green);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ---- Grid de artículos ---- */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 56px;
}

/* ---- Card de artículo ---- */
.blog-card {
    border: 1px solid #E5E7EB;
    border-radius: 24px;
    overflow: hidden;
    background: #fff;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.blog-card:hover {
    border-color: var(--flex-black);
    box-shadow: 0 8px 28px rgba(5,9,13,0.09);
    transform: translateY(-2px);
}

.blog-card-img {
    aspect-ratio: 16 / 9;
    background: #F3F4F6;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    overflow: hidden;
    flex-shrink: 0;
}

.blog-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-card-body {
    padding: 22px 22px 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.blog-card-cat {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--flex-green);
    margin-bottom: 10px;
}

.blog-card-title {
    font-size: 17px;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.25;
    color: var(--flex-black);
    margin-bottom: 10px;
    flex-grow: 1;
}

.blog-card-excerpt {
    font-size: 14px;
    color: var(--flex-gray);
    line-height: 1.6;
    margin-bottom: 16px;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: #9CA3AF;
    font-weight: 500;
    padding-top: 14px;
    border-top: 1px solid #F3F4F6;
    margin-top: auto;
}

.blog-card-readtime {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ---- Bloque de estadísticas ---- */
.blog-stats-block {
    background: var(--flex-black);
    border-radius: 28px;
    padding: 48px 40px;
    margin-bottom: 56px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.blog-stat-item {
    text-align: center;
}

.blog-stat-num {
    font-size: 40px;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: var(--flex-green);
    line-height: 1;
    margin-bottom: 8px;
}

.blog-stat-label {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    line-height: 1.4;
    font-weight: 500;
}

.blog-stat-source {
    font-size: 11px;
    color: rgba(255,255,255,0.3);
    margin-top: 4px;
}

/* ---- Sección FAQ (clave para GEO) ---- */
.blog-faq {
    margin-bottom: 56px;
}

.blog-faq-header {
    margin-bottom: 28px;
}

.blog-faq-title {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: var(--flex-black);
    margin-bottom: 8px;
}

.blog-faq-sub {
    font-size: 15px;
    color: var(--flex-gray);
}

.faq-item {
    border: 1px solid #E5E7EB;
    border-radius: 16px;
    margin-bottom: 8px;
    overflow: hidden;
    background: #fff;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    cursor: pointer;
    user-select: none;
    gap: 16px;
    transition: background 0.2s;
}

.faq-question:hover {
    background: #F9FAFB;
}

.faq-q-text {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--flex-black);
    line-height: 1.4;
}

.faq-icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #F3F4F6;
    border: 1px solid #E5E7EB;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--flex-gray);
    transition: all 0.3s;
    font-weight: 700;
}

.faq-item.open .faq-icon {
    background: var(--flex-green);
    border-color: var(--flex-green);
    color: #fff;
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 0 24px 22px;
    font-size: 15px;
    color: #374151;
    line-height: 1.75;
    animation: faqIn 0.2s ease;
}

.faq-item.open .faq-answer {
    display: block;
}

@keyframes faqIn {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

.faq-answer strong {
    color: var(--flex-black);
}

.faq-answer a {
    color: var(--flex-green);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ---- Glosario / Definiciones (GEO) ---- */
.blog-glossary {
    background: #F9FAFB;
    border: 1px solid #E5E7EB;
    border-radius: 28px;
    padding: 40px;
    margin-bottom: 56px;
}

.blog-glossary-title {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 6px;
}

.blog-glossary-sub {
    font-size: 14px;
    color: var(--flex-gray);
    margin-bottom: 28px;
}

.glossary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.glossary-item {
    background: #fff;
    border: 1px solid #E5E7EB;
    border-radius: 16px;
    padding: 18px 20px;
}

.glossary-term {
    font-size: 14px;
    font-weight: 800;
    color: var(--flex-black);
    letter-spacing: -0.02em;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.glossary-term .term-badge {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 99px;
    background: var(--flex-green);
    color: #fff;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.glossary-def {
    font-size: 13px;
    color: var(--flex-gray);
    line-height: 1.55;
}

/* ---- CTA Newsletter ---- */
.blog-cta {
    background: var(--flex-black);
    border-radius: 28px;
    padding: 48px 40px;
    text-align: center;
    margin-bottom: 0;
}

.blog-cta-title {
    font-size: 30px;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: #fff;
    margin-bottom: 10px;
}

.blog-cta-sub {
    font-size: 16px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 28px;
    line-height: 1.5;
}

.blog-cta-btn {
    display: inline-block;
    background: var(--flex-green);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    padding: 16px 32px;
    border-radius: 20px;
    text-decoration: none;
    transition: transform 0.2s, background 0.2s;
    border: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    letter-spacing: -0.02em;
}

.blog-cta-btn:hover {
    background: #16a34a;
    transform: scale(1.02);
}

.blog-cta-note {
    margin-top: 14px;
    font-size: 13px;
    color: rgba(255,255,255,0.35);
}

/* ---- Botón volver arriba ---- */
#btn-top-blog {
    position: fixed;
    bottom: 32px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--flex-black);
    color: #fff;
    font-size: 18px;
    border: none;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
    z-index: 999;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

#btn-top-blog.visible {
    opacity: 1;
    pointer-events: auto;
}

#btn-top-blog:hover {
    background: var(--flex-green);
    transform: translateY(-2px);
}

/* ====================== RESPONSIVE ====================== */
@media (max-width: 900px) {
    .blog-grid {
        grid-template-columns: 1fr 1fr;
    }

    .blog-stats-block {
        grid-template-columns: 1fr 1fr;
    }

    .blog-featured {
        grid-template-columns: 1fr;
    }

    .blog-featured-img {
        min-height: 200px;
    }
}

@media (max-width: 768px) {
    .blog-page {
        padding: 32px 16px 60px;
    }

    .blog-title {
        font-size: 32px;
    }

    .blog-header {
        grid-template-columns: 1fr;
    }

    .blog-stats {
        text-align: left;
        flex-direction: row;
        gap: 20px;
    }

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

    .blog-stats-block {
        grid-template-columns: 1fr 1fr;
        padding: 28px 24px;
        gap: 20px;
    }

    .blog-stat-num {
        font-size: 30px;
    }

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

    .blog-glossary {
        padding: 24px 20px;
    }

    .blog-cta {
        padding: 32px 20px;
    }

    .blog-cta-title {
        font-size: 24px;
    }

    .blog-featured-body {
        padding: 28px 24px;
    }

    .blog-featured-title {
        font-size: 21px;
    }

    .faq-q-text {
        font-size: 15px;
    }

    .faq-question {
        padding: 18px 18px;
    }

    .faq-answer {
        padding: 0 18px 18px;
    }
}

@media (max-width: 480px) {
    .blog-stats-block {
        grid-template-columns: 1fr 1fr;
    }

    .blog-filters {
        gap: 6px;
    }

    .filter-btn {
        font-size: 13px;
        padding: 8px 14px;
    }
}