html,body{font-synthesis:none;width:100%;height:100%;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;font-weight:400;line-height:1.5}body{color:#213547;background-color:#fff;min-height:100vh;margin:0;padding:0}button{all:unset}a{all:unset;cursor:pointer}:root{--bg-primary:#fff;--bg-secondary:#f8f9fa;--bg-tertiary:#e9ecef;--text-primary:#2c3e50;--text-secondary:#555;--text-tertiary:#6c757d;--border-color:#e9ecef;--active-color:#2196f3;--shadow-light:#0000000d;--shadow-blue:#2196f34d}@media (prefers-color-scheme:dark){:root{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-tertiary:#404040;--text-primary:#fff;--text-secondary:#ccc;--text-tertiary:#999;--border-color:#404040;--active-color:#3b82f6;--shadow-light:#0000004d;--shadow-blue:#3b82f64d}}*{box-sizing:border-box;margin:0;padding:0}.app{background-color:var(--bg-primary);width:100%;height:100vh;color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;transition:background-color .3s,color .3s;overflow:hidden}.help-center{width:100%;height:100vh;display:flex;overflow:hidden}.sidebar{background-color:var(--bg-secondary);border-right:1px solid var(--border-color);flex-direction:column;flex-shrink:0;width:250px;transition:all .3s;display:flex;overflow-y:auto}.sidebar-header{border-bottom:1px solid var(--border-color);background-color:var(--bg-primary);z-index:10;box-shadow:0 2px 4px var(--shadow-light);padding:20px;position:sticky;top:0}.sidebar-header h1{color:var(--text-primary);margin:0;font-size:1.5rem;font-weight:600}.sidebar-nav{flex:1;padding:10px 0}.nav-item{cursor:pointer;color:var(--text-secondary);text-align:left;background:0 0;border:none;width:100%;padding:12px 20px;font-size:.95rem;transition:all .3s cubic-bezier(.4,0,.2,1);display:block;position:relative;overflow:hidden}.nav-icon{display:none}.folder-toggle{float:right;color:var(--text-tertiary);font-size:.8rem;transition:all .3s;transform:rotate(0)}.folder-toggle.expanded{color:var(--active-color);transform:rotate(90deg)}.nav-item.folder-item{color:var(--text-primary);font-weight:600}.nav-item.file-item{box-shadow:none;background:0 0;border-radius:0;margin:0}.nav-item.level-1{padding-left:40px}.nav-item{position:relative;overflow:hidden}.nav-item:before{content:"";background:var(--shadow-blue);pointer-events:none;opacity:0;z-index:0;transition:opacity .5s;position:absolute;inset:0}.nav-item:hover:before{opacity:.3}.nav-item span,.nav-item{z-index:1;position:relative}.nav-item.active{color:var(--active-color);box-shadow:none;background:0 0;border-left:none;font-weight:500}.nav-item.active:after{display:none}.nav-folder-children{background-color:var(--bg-secondary)}@keyframes slideDown{0%{opacity:0}to{opacity:1}}@keyframes fadeInLeft{0%{opacity:0}to{opacity:1}}.sidebar-footer{border-top:1px solid var(--border-color);color:var(--text-tertiary);text-align:center;background-color:var(--bg-primary);z-index:10;padding:20px;font-size:.8rem;position:sticky;bottom:0}.content{background-color:var(--bg-primary);flex:1;padding:40px;position:relative;overflow-y:auto}.content-inner{opacity:1;transition:all .4s cubic-bezier(.4,0,.2,1);transform:translateY(0)}.content.transitioning .content-inner.fade-out{opacity:0;transform:translateY(20px)}.content-inner.fade-in{opacity:1;animation:.5s ease-out fadeInContent;transform:translateY(0)}@keyframes fadeInContent{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.content h1{color:var(--text-primary);border-bottom:3px solid var(--border-color);margin-bottom:30px;padding-bottom:15px;font-size:2.5rem;font-weight:800}.content h2{color:var(--text-primary);border-left:4px solid var(--active-color);margin-top:30px;margin-bottom:15px;padding-left:15px;font-size:1.8rem;font-weight:700}.content h3{color:var(--text-primary);margin-top:25px;margin-bottom:12px;font-size:1.4rem;font-weight:600}.content p{color:var(--text-secondary);margin-bottom:15px;font-size:1.05rem;line-height:1.8}.content ul,.content ol{color:var(--text-secondary);margin-bottom:15px;padding-left:30px}.content li{margin-bottom:8px;line-height:1.6}.content li::marker{color:var(--active-color);font-weight:700}.content a{color:var(--active-color);border-bottom:1px solid #0000;text-decoration:none;transition:all .2s}.content a:hover{color:var(--active-color);border-bottom-color:var(--active-color);opacity:.8}.content blockquote{border-left:4px solid var(--border-color);background-color:var(--bg-secondary);color:var(--text-tertiary);border-radius:0 6px 6px 0;margin-bottom:15px;padding:15px 20px;font-style:italic}.content::-webkit-scrollbar{width:8px}.sidebar::-webkit-scrollbar{width:8px}.content::-webkit-scrollbar-track{background:var(--bg-secondary);border-radius:4px}.sidebar::-webkit-scrollbar-track{background:var(--bg-secondary);border-radius:4px}.content::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:4px;transition:all .2s}.sidebar::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:4px;transition:all .2s}.content::-webkit-scrollbar-thumb:hover{background:#777}.sidebar::-webkit-scrollbar-thumb:hover{background:#777}@media (max-width:768px){.help-center{flex-direction:column}.sidebar{border-right:none;border-bottom:1px solid var(--border-color);width:100%;height:200px}.content{padding:20px}.content h1{font-size:2rem}.content h2{font-size:1.5rem}.content h3{font-size:1.2rem}}