.learn-section{padding:160px 0 80px;background:var(--bg-primary, #02040A);min-height:100vh}.learn-container{max-width:900px;margin:0 auto;padding:0 24px}.learn-header{margin-bottom:64px}.learn-label{display:inline-block;font-family:var(--font-mono, monospace);font-size:.75rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:#3b82f6;background:#3b82f61a;padding:6px 12px;border-radius:4px;margin-bottom:16px}.learn-header h1{font-family:var(--font-serif, Georgia, serif);font-size:clamp(2.5rem,5vw,3.5rem);font-weight:500;color:var(--text-primary, #F8FAFC);margin:0 0 16px;letter-spacing:-.02em}.learn-header p{font-size:1.125rem;color:var(--text-secondary, rgba(248, 250, 252, .7));line-height:1.6;max-width:600px}.learn-root-definition{font-size:1.25rem;color:var(--text-primary, #F8FAFC);line-height:1.7;max-width:700px;margin-bottom:16px;padding:20px 24px;background:#3b82f614;border-left:3px solid #3B82F6;border-radius:0 8px 8px 0}.learn-category{margin-bottom:56px}.category-title{font-family:var(--font-sans, sans-serif);font-size:.875rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--text-tertiary, rgba(248, 250, 252, .5));margin:0 0 20px;padding-bottom:12px;border-bottom:1px solid var(--bg-tertiary, #1E293B)}.articles-grid{display:flex;flex-direction:column;gap:16px}.article-card{display:block;padding:28px 32px;background:var(--bg-secondary, #0F172A);border:1px solid var(--bg-tertiary, #1E293B);border-radius:12px;text-decoration:none;transition:all .2s ease}.article-card:hover{border-color:#3b82f6;transform:translateY(-2px)}.article-meta{margin-bottom:12px}.read-time{font-family:var(--font-mono, monospace);font-size:.75rem;color:var(--text-tertiary, rgba(248, 250, 252, .5));text-transform:uppercase;letter-spacing:.05em}.article-card h3{font-family:var(--font-serif, Georgia, serif);font-size:1.375rem;font-weight:500;color:var(--text-primary, #F8FAFC);margin:0 0 10px;line-height:1.3}.article-card p{font-size:.9375rem;color:var(--text-secondary, rgba(248, 250, 252, .7));line-height:1.6;margin:0 0 16px}.article-link{display:inline-flex;align-items:center;gap:6px;font-size:.875rem;font-weight:600;color:#3b82f6}.article-link svg{transition:transform .2s ease}.article-card:hover .article-link svg{transform:translate(4px)}.breadcrumb{font-family:var(--font-mono, monospace);font-size:.75rem;color:var(--text-tertiary, rgba(248, 250, 252, .5));margin-bottom:32px;display:flex;align-items:center;gap:8px}.breadcrumb a{color:var(--text-tertiary, rgba(248, 250, 252, .5));text-decoration:none;transition:color .2s ease}.breadcrumb a:hover{color:#3b82f6}.breadcrumb span{color:var(--text-tertiary, rgba(248, 250, 252, .4))}.pillar-header{margin-bottom:48px}.pillar-header h1{font-family:var(--font-serif, Georgia, serif);font-size:clamp(2.5rem,5vw,3.5rem);font-weight:500;color:var(--text-primary, #F8FAFC);margin:0 0 16px;letter-spacing:-.02em}.pillar-intro{font-size:1.25rem;color:var(--text-secondary, rgba(248, 250, 252, .7));line-height:1.6;max-width:600px}.pillar-overview{margin-bottom:56px;padding:32px;background:var(--bg-secondary, #0F172A);border:1px solid var(--bg-tertiary, #1E293B);border-radius:12px}.pillar-overview h2{font-family:var(--font-serif, Georgia, serif);font-size:1.5rem;font-weight:500;color:var(--text-primary, #F8FAFC);margin:0 0 16px}.pillar-overview p{font-size:1rem;color:var(--text-secondary, rgba(248, 250, 252, .7));line-height:1.7;margin:0 0 16px}.pillar-overview p:last-child{margin-bottom:0}.pillar-articles{margin-bottom:56px}.pillar-articles h2{font-family:var(--font-sans, sans-serif);font-size:.875rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--text-tertiary, rgba(248, 250, 252, .5));margin:0 0 20px;padding-bottom:12px;border-bottom:1px solid var(--bg-tertiary, #1E293B)}.pillar-articles .section-intro{font-size:.9375rem;color:var(--text-secondary, rgba(248, 250, 252, .6));margin:-8px 0 24px}.pillar-article-card{display:flex;gap:24px;padding:24px 28px;background:var(--bg-secondary, #0F172A);border:1px solid var(--bg-tertiary, #1E293B);border-radius:12px;text-decoration:none;transition:all .2s ease;margin-bottom:12px}.pillar-article-card:hover{border-color:#3b82f6;transform:translate(4px)}.pillar-article-number{font-family:var(--font-mono, monospace);font-size:.875rem;font-weight:600;color:#3b82f6;min-width:28px;padding-top:4px}.pillar-article-content h3{font-family:var(--font-serif, Georgia, serif);font-size:1.25rem;font-weight:500;color:var(--text-primary, #F8FAFC);margin:0 0 8px;line-height:1.3}.pillar-article-content p{font-size:.9375rem;color:var(--text-secondary, rgba(248, 250, 252, .7));line-height:1.6;margin:0 0 12px}.pillar-article-meta{font-family:var(--font-mono, monospace);font-size:.75rem;color:var(--text-tertiary, rgba(248, 250, 252, .5));text-transform:uppercase;letter-spacing:.05em}.pillar-next{padding:32px;background:var(--bg-secondary, #0F172A);border:1px solid var(--bg-tertiary, #1E293B);border-radius:12px}.pillar-next h2{font-family:var(--font-serif, Georgia, serif);font-size:1.25rem;font-weight:500;color:var(--text-primary, #F8FAFC);margin:0 0 12px}.pillar-next p{font-size:.9375rem;color:var(--text-secondary, rgba(248, 250, 252, .7));margin:0 0 20px}.pillar-links{display:flex;gap:16px;flex-wrap:wrap}.pillar-link{display:inline-block;font-size:.9375rem;font-weight:600;color:#3b82f6;text-decoration:none;padding:10px 20px;background:#3b82f61a;border-radius:8px;transition:all .2s ease}.pillar-link:hover{background:#3b82f633}.pillar-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-bottom:56px}.pillar-card{display:block;padding:28px;background:linear-gradient(135deg,rgba(59,130,246,.1) 0%,transparent 60%);border:1px solid rgba(59,130,246,.3);border-radius:12px;text-decoration:none;transition:all .2s ease}.pillar-card:hover{border-color:#3b82f6;transform:translateY(-2px)}.pillar-card h3{font-family:var(--font-serif, Georgia, serif);font-size:1.25rem;font-weight:500;color:var(--text-primary, #F8FAFC);margin:0 0 8px}.pillar-card p{font-size:.875rem;color:var(--text-secondary, rgba(248, 250, 252, .7));line-height:1.5;margin:0 0 12px}.pillar-card .article-count{font-family:var(--font-mono, monospace);font-size:.75rem;color:#3b82f6;text-transform:uppercase;letter-spacing:.05em}@media(max-width:600px){.learn-section{padding:120px 0 60px}.article-card{padding:20px 24px}.article-card h3{font-size:1.25rem}.pillar-article-card{flex-direction:column;gap:12px}.pillar-article-number{font-size:.75rem}.pillar-links{flex-direction:column}.pillar-link{text-align:center}}