:root{--bg: #0a0c10;--surface: #111418;--border: #1e2430;--text: #e2e8f0;--muted: #8494a7;--blue: #3b82f6;--green: #22c55e;--red: #ef4444;--amber: #f59e0b;--purple: #a855f7}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);font-family:DM Sans,sans-serif;margin:0;padding:0}::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}code,.mono{font-family:DM Mono,monospace}:focus-visible{outline:2px solid var(--blue);outline-offset:2px}.chapter-nav-link>div{transition:border-color .2s,background .2s}.chapter-nav-link:hover>div,.chapter-nav-link:focus-visible>div{border-color:#3b82f666;background:#3b82f60a}.sidebar{width:210px;background:var(--surface);border-right:1px solid var(--border);padding:24px 0;display:flex;flex-direction:column;flex-shrink:0;position:sticky;top:0;height:100vh;overflow-y:auto;transition:width .2s ease}.sidebar--collapsed{width:44px}.sidebar a[style]:hover{background:#ffffff08!important}.sidebar-nav-separator{height:1px;background:var(--border);margin:6px 16px;opacity:.4}.sidebar--collapsed .sidebar-nav-separator{margin:6px 8px}.sidebar-collapse-btn:hover{color:var(--text)}.sidebar-toggle{display:none;position:fixed;top:12px;left:12px;z-index:1001;background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:6px 10px;cursor:pointer}.sidebar-overlay{display:none}@media (max-width: 768px){.sidebar{position:fixed;top:0;left:0;z-index:1000;transform:translate(-100%);transition:transform .25s ease;height:100vh}.sidebar--open{transform:translate(0)}.sidebar-toggle{display:block}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:999;background:#00000080}}@keyframes pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.4);opacity:.7}}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@keyframes drawPath{0%{stroke-dashoffset:600}to{stroke-dashoffset:0}}@keyframes replicatePulse{0%{r:4;opacity:1}to{r:8;opacity:0}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}