/* ========== BLOG — Trading Sistematico ========== */

.blog-hero {
    padding: 140px 0 60px;
    text-align: center;
    background: var(--bg-deep);
    position: relative;
}

.blog-hero::before {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 50% 80%, rgba(108, 140, 255, 0.04) 0%, transparent 60%);
    pointer-events: none;
}

.blog-hero .section-description { margin-bottom: 0; }

.blog-filters {
    padding: 0 0 3rem;
    background: var(--bg-deep);
    position: sticky; top: 76px; z-index: 50;
}

.filter-bar {
    display: flex; gap: 0.5rem; overflow-x: auto;
    padding: 1rem 0; border-bottom: 1px solid var(--border-subtle);
    -webkit-overflow-scrolling: touch; scrollbar-width: none;
}
.filter-bar::-webkit-scrollbar { display: none; }

.filter-btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem; font-weight: 500; letter-spacing: 0.5px;
    padding: 0.55rem 1.3rem; border-radius: var(--radius-full);
    border: 1px solid var(--border-medium); background: transparent;
    color: var(--text-muted); cursor: pointer;
    transition: var(--transition-fast); white-space: nowrap;
}
.filter-btn:hover { color: var(--text-primary); border-color: var(--accent); }
.filter-btn.active { background: rgba(108, 140, 255, 0.1); color: var(--accent); border-color: var(--accent); }

.blog-featured { padding: 0 0 4rem; }

.featured-card {
    display: grid; grid-template-columns: 1.2fr 1fr; gap: 3rem;
    padding: 2.5rem; border-radius: var(--radius-xl);
    background: linear-gradient(135deg, rgba(108, 140, 255, 0.04) 0%, var(--glass-bg) 100%);
    border: 1px solid rgba(108, 140, 255, 0.15);
    transition: var(--transition); text-decoration: none; color: inherit;
}
.featured-card:hover { border-color: rgba(108, 140, 255, 0.3); transform: translateY(-4px); box-shadow: 0 20px 60px rgba(0,0,0,0.2); }

.featured-image { border-radius: var(--radius-lg); overflow: hidden; aspect-ratio: 16/9; background: var(--bg-surface); }
.featured-image img { width: 100%; height: 100%; object-fit: cover; }

.featured-content { display: flex; flex-direction: column; justify-content: center; }

.article-category {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem; font-weight: 500; letter-spacing: 1.5px;
    text-transform: uppercase; color: var(--accent); margin-bottom: 0.8rem;
}

.featured-content h2 { font-size: 1.6rem; font-weight: 800; line-height: 1.25; margin-bottom: 1rem; }
.featured-content p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; margin-bottom: 1.5rem; }

.article-meta { display: flex; align-items: center; gap: 1.2rem; font-size: 0.82rem; color: var(--text-muted); }
.meta-separator { width: 3px; height: 3px; border-radius: 50%; background: var(--text-muted); }

.blog-grid-section { padding: 0 0 5rem; }
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }

.article-card {
    display: flex; flex-direction: column; border-radius: var(--radius-lg);
    background: var(--glass-bg); border: 1px solid var(--border-subtle);
    overflow: hidden; transition: var(--transition); text-decoration: none; color: inherit;
}
.article-card:hover { transform: translateY(-6px); border-color: rgba(108, 140, 255, 0.25); box-shadow: 0 16px 50px rgba(0,0,0,0.2); }
.article-card:hover .article-thumb img { transform: scale(1.05); }

.article-thumb { aspect-ratio: 16/9; overflow: hidden; background: var(--bg-surface); }
.article-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease-out); }

.article-body { padding: 1.5rem; display: flex; flex-direction: column; flex-grow: 1; }
.article-body .article-category { margin-bottom: 0.5rem; }
.article-body h3 { font-size: 1.08rem; font-weight: 700; line-height: 1.35; margin-bottom: 0.6rem; }
.article-body p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.65; flex-grow: 1; margin-bottom: 1rem; }
.article-body .article-meta { margin-top: auto; }

.cat-strategy-design { color: #6c8cff; }
.cat-backtesting { color: #00d4aa; }
.cat-automazione { color: #e8854a; }
.cat-risk-management { color: #c9a84c; }
.cat-fondamenti { color: #93abff; }

.blog-loading { text-align: center; padding: 4rem 0; }
.spinner { width: 36px; height: 36px; border: 3px solid var(--border-subtle); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 1rem; }
@keyframes spin { to { transform: rotate(360deg); } }
.blog-loading p, .blog-empty p { color: var(--text-muted); font-size: 0.95rem; }

.thumb-placeholder {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
    font-size: 2.5rem; opacity: 0.3;
}

@media (max-width: 1024px) {
    .blog-grid { grid-template-columns: repeat(2, 1fr); }
    .featured-card { grid-template-columns: 1fr; gap: 1.5rem; }
}

@media (max-width: 768px) {
    .blog-hero { padding: 120px 0 40px; }
    .blog-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
    .featured-card { padding: 1.5rem; }
    .featured-content h2 { font-size: 1.3rem; }
}