.knowledge-page{padding:2rem 0}.knowledge-layout{display:grid;grid-template-columns:300px 1fr;gap:2rem;min-height:calc(100vh - 200px)}.knowledge-sidebar{background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);overflow:hidden;height:fit-content;position:sticky;top:100px}.sidebar-header{display:flex;align-items:center;gap:0.75rem;padding:1.25rem;background:linear-gradient(135deg,rgba(255,85,0,0.15),rgba(255,85,0,0.05));border-bottom:1px solid var(--border-color);font-size:1.125rem;font-weight:700;color:var(--accent-orange)}.sidebar-header i{font-size:1.5rem}.knowledge-nav{padding:0.5rem}.nav-section{margin-bottom:0.25rem}.nav-section-header{display:flex;align-items:center;gap:0.75rem;width:100%;padding:0.75rem 1rem;background:transparent;border:none;border-radius:var(--border-radius);color:var(--accent-orange);font-family:var(--font-main);font-size:0.9375rem;font-weight:600;cursor:pointer;transition:all 0.2s ease;text-align:left}.nav-section-header:hover{background:rgba(255,85,0,0.1)}.nav-section.active > .nav-section-header{background:rgba(255,85,0,0.15)}.nav-section-header i:first-child{font-size:1.125rem;width:20px;text-align:center}.nav-section-header span{flex:1}.nav-arrow{font-size:1.25rem;transition:transform 0.2s ease;opacity:0.6}.nav-section.active .nav-arrow{transform:rotate(180deg)}.nav-section-items{display:none;padding-left:0.5rem;margin-top:0.25rem}.nav-section.active .nav-section-items{display:block}.nav-item{display:flex;align-items:center;gap:0.75rem;padding:0.625rem 1rem;padding-left:2.5rem;color:var(--text-secondary);text-decoration:none;font-size:0.875rem;border-radius:var(--border-radius);transition:all 0.2s ease;position:relative}.nav-item::before{content:'';position:absolute;left:1.25rem;top:0;bottom:0;width:1px;background:var(--border-color)}.nav-item:hover{background:rgba(255,85,0,0.1);color:var(--text-primary)}.nav-item.active{background:var(--accent-orange);color:white}.nav-item.active::before{display:none}.nav-item i{font-size:1rem;opacity:0.7}.knowledge-content{background:var(--card-bg);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);min-height:500px}.article-content{padding:2rem}.article-body{color:var(--text-primary);line-height:1.8;font-size:1rem}.article-body p{margin-bottom:1.25rem}.article-body strong{color:var(--accent-orange)}.article-body ul,.article-body ol{margin:1rem 0;padding-left:1.5rem}.article-body li{margin-bottom:0.5rem}.article-body h1,.article-body h2,.article-body h3{color:var(--text-primary);margin:1.5rem 0 1rem}.article-body a{color:var(--accent-orange)}.article-body a:hover{text-decoration:underline}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 2rem;text-align:center;color:var(--text-muted)}.empty-state i{font-size:4rem;margin-bottom:1rem;opacity:0.5}.empty-state h3{margin-bottom:0.5rem;color:var(--text-secondary)}@media (max-width:1024px){.knowledge-layout{grid-template-columns:260px 1fr;gap:1.5rem}}@media (max-width:768px){.knowledge-layout{grid-template-columns:1fr}.knowledge-sidebar{position:static}.knowledge-content{min-height:auto}}