:root{--bg: #0a0a0f;--bg-panel: rgba(255,255,255,.03);--bg-elevated: rgba(255,255,255,.06);--bg-hover: rgba(255,255,255,.08);--bg-active: rgba(56,189,248,.08);--border: rgba(255,255,255,.06);--border-strong: rgba(255,255,255,.12);--text: #e8e8ed;--text-muted: rgba(232,232,237,.55);--text-faint: rgba(232,232,237,.25);--accent: #38bdf8;--accent-bright: #7dd3fc;--accent-dim: rgba(56,189,248,.12);--accent-glow: 0 0 30px rgba(56,189,248,.2);--green: #4ade80;--green-dim: rgba(74,222,128,.12);--yellow: #facc15;--yellow-dim: rgba(250,204,21,.12);--orange: #fb923c;--red: #f87171;--purple: #a78bfa;--purple-dim: rgba(167,139,250,.12);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;--radius: 10px;--radius-sm: 6px;--shadow: 0 8px 32px rgba(0,0,0,.5)}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%;font-family:var(--font-sans);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}#root{display:flex}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-bright)}code,pre{font-family:var(--font-mono);font-size:.88em}pre{background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;overflow-x:auto}code{background:var(--bg-elevated);padding:2px 6px;border-radius:4px}pre code{background:none;padding:0}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-faint)}.viz-container{background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin:20px 0}.viz-container canvas{display:block;margin:0 auto;border-radius:var(--radius-sm)}.controls{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:12px}.controls label{font-size:13px;color:var(--text-muted);display:flex;align-items:center;gap:8px}.controls input[type=range]{width:120px;accent-color:var(--accent)}.controls input[type=number]{width:72px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);padding:4px 8px;font-family:var(--font-mono);font-size:13px}button{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);padding:6px 14px;font-size:13px;cursor:pointer;transition:all .15s}button:hover{background:var(--bg-hover);border-color:var(--border-strong)}button.primary{background:var(--accent-dim);border-color:#38bdf84d;color:var(--accent-bright)}button.primary:hover{background:#38bdf82e}.math-block{background:var(--bg-panel);border-left:3px solid var(--accent);padding:16px 20px;margin:16px 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-family:var(--font-mono);font-size:15px;line-height:1.8;overflow-x:auto}.math-inline{font-family:var(--font-mono);color:var(--accent-bright);font-size:.92em}.callout{border-radius:var(--radius);padding:16px 20px;margin:16px 0}.callout-key{background:var(--accent-dim);border:1px solid rgba(56,189,248,.2)}.callout-key:before{content:"KEY CONCEPT";display:block;font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--accent);margin-bottom:8px}.callout-intuition{background:var(--purple-dim);border:1px solid rgba(167,139,250,.2)}.callout-intuition:before{content:"INTUITION";display:block;font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--purple);margin-bottom:8px}.callout-warning{background:var(--yellow-dim);border:1px solid rgba(250,204,21,.2)}.callout-warning:before{content:"WATCH OUT";display:block;font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--yellow);margin-bottom:8px}.callout-exercise{background:var(--green-dim);border:1px solid rgba(74,222,128,.2)}.callout-exercise:before{content:"EXERCISE";display:block;font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--green);margin-bottom:8px}.annotatable{position:relative}.annotatable:hover .annotation-add-btn{opacity:1}.annotation-indicator{position:absolute;top:4px;right:-16px;width:3px;height:20px;background:var(--accent);border-radius:2px;cursor:pointer;transition:background .15s,box-shadow .15s;z-index:2}.annotation-indicator:hover{background:var(--accent-bright);box-shadow:0 0 8px #38bdf866}.annotation-add-btn{position:absolute;top:4px;right:-20px;width:20px;height:20px;display:flex;align-items:center;justify-content:center;padding:0;font-size:14px;font-weight:500;line-height:1;color:var(--text-faint);background:transparent;border:1px solid transparent;border-radius:4px;cursor:pointer;opacity:0;transition:opacity .15s,color .15s,background .15s,border-color .15s;z-index:2}.annotation-add-btn:hover{opacity:1;color:var(--accent);background:var(--bg-elevated);border-color:var(--border)}.annotation-popover{position:absolute;top:0;right:-340px;width:320px;background:var(--bg-elevated);border:1px solid var(--border-strong);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow);z-index:100;animation:annotationFadeIn .15s ease-out}@keyframes annotationFadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.annotation-text{font-size:13px;line-height:1.6;color:var(--text);margin:0 0 10px;white-space:pre-wrap;word-break:break-word}.annotation-meta{display:flex;align-items:center;justify-content:space-between;gap:8px}.annotation-timestamp{font-size:11px;color:var(--text-faint)}.annotation-meta-actions{display:flex;gap:6px}.annotation-edit-btn,.annotation-delete-btn{font-size:11px;padding:2px 8px;border-radius:4px;cursor:pointer;background:transparent;border:1px solid var(--border);color:var(--text-muted);transition:all .15s}.annotation-edit-btn:hover{color:var(--accent);border-color:#38bdf84d;background:var(--accent-dim)}.annotation-delete-btn:hover{color:var(--red);border-color:#f871714d;background:#f8717114}.annotation-textarea{width:100%;min-height:60px;resize:vertical;font-family:var(--font-sans);font-size:13px;line-height:1.6;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;outline:none;transition:border-color .15s}.annotation-textarea:focus{border-color:var(--accent)}.annotation-textarea::placeholder{color:var(--text-faint)}.annotation-actions{display:flex;gap:6px;margin-top:8px}.annotation-save-btn{font-size:12px;padding:4px 12px;border-radius:4px;cursor:pointer;background:var(--accent-dim);border:1px solid rgba(56,189,248,.3);color:var(--accent-bright);font-weight:500;transition:all .15s}.annotation-save-btn:hover:not(:disabled){background:#38bdf82e}.annotation-save-btn:disabled{opacity:.4;cursor:default}.annotation-cancel-btn{font-size:12px;padding:4px 12px;border-radius:4px;cursor:pointer;background:transparent;border:1px solid var(--border);color:var(--text-muted);transition:all .15s}.annotation-cancel-btn:hover{background:var(--bg-hover);border-color:var(--border-strong)}