:root{--bg: #090c12;--bg-soft: #10141d;--bg-elev: #191f2b;--bg-glass: rgba(16, 20, 29, .78);--border: #232b3a;--border-soft: rgba(255, 255, 255, .07);--text: #e8eef6;--text-dim: #8b97a8;--accent: #5b9df9;--accent-strong: #3b82f6;--accent-2: #34d399;--warn: #fbbf24;--danger: #f87171;--code-bg: #0a0e16;--radius-sm: 9px;--radius: 14px;--radius-lg: 20px;--shadow: 0 6px 24px rgba(0, 0, 0, .35);--shadow-lg: 0 18px 50px rgba(0, 0, 0, .5);--sidebar-w: 320px;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color-scheme:dark}.app[data-course=js]{--accent: #f5c518;--accent-strong: #d9a406}.app[data-course=react]{--accent: #38d0ee;--accent-strong: #22b8d6}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;background-image:radial-gradient(900px 500px at 78% -8%,rgba(91,157,249,.1),transparent 60%),radial-gradient(700px 500px at 0% 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