:root{font-family:Avenir Next,Segoe UI,sans-serif;line-height:1.35;font-weight:450;color-scheme:dark;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}.app{display:flex;flex-direction:column;height:100%;background:radial-gradient(circle at 20% 0%,rgba(14,165,233,.2),transparent 46%),radial-gradient(circle at 80% 100%,rgba(34,197,94,.12),transparent 45%)}.theme-dark{--bg: #020617;--bg-elev: rgba(15, 23, 42, .78);--text: #e2e8f0;--muted: #94a3b8;--border: rgba(148, 163, 184, .28);--button-bg: rgba(30, 41, 59, .78);--button-hover: rgba(51, 65, 85, .82)}.theme-light{--bg: #f8fafc;--bg-elev: rgba(255, 255, 255, .85);--text: #0f172a;--muted: #334155;--border: rgba(51, 65, 85, .22);--button-bg: rgba(241, 245, 249, .95);--button-hover: rgba(226, 232, 240, .95)}.topbar{min-height:60px;display:flex;justify-content:space-between;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--border);background:var(--bg-elev);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--text)}.brand{font-size:1.05rem;font-weight:680;letter-spacing:.03em}.topbar-actions{display:flex;flex-wrap:wrap;gap:8px}button,input,label{font:inherit}button{border:1px solid var(--border);background:var(--button-bg);color:var(--text);border-radius:10px;padding:6px 12px;cursor:pointer}button:hover{background:var(--button-hover)}button:disabled{opacity:.55;cursor:not-allowed}.layout{flex:1;min-height:0;display:grid;grid-template-columns:minmax(280px,360px) 1fr}.sidebar{border-right:1px solid var(--border);background:var(--bg-elev);color:var(--text);overflow:auto;padding:14px}.panel-block{border:1px solid var(--border);border-radius:12px;padding:12px;margin-bottom:12px;background:color-mix(in srgb,var(--bg-elev) 92%,transparent)}.panel-block h2{margin:0 0 10px;font-size:.93rem;letter-spacing:.02em}.equations{display:flex;flex-direction:column;gap:10px;margin-bottom:10px}.equation-item{border:1px solid var(--border);border-radius:10px;padding:10px;display:flex;flex-direction:column;gap:7px}.row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.row label{display:inline-flex;align-items:center;gap:6px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.grid-2 label{display:flex;flex-direction:column;gap:4px;color:var(--muted);font-size:.9rem}input[type=text],input[type=number]{border:1px solid var(--border);background:transparent;color:var(--text);padding:7px 8px;border-radius:8px}.expr-input{font-family:SF Mono,Menlo,monospace}.graph-area{--graph-pad: 12px;position:relative;min-height:0;padding:var(--graph-pad);background:var(--bg)}.graph-canvas{width:100%;height:100%;border-radius:12px;border:1px solid var(--border);touch-action:none}.hover-overlay{position:absolute;inset:var(--graph-pad);pointer-events:none}.hover-line-x,.hover-line-y{position:absolute;background:color-mix(in srgb,var(--text) 45%,transparent)}.hover-line-x{left:0;right:0;height:1px}.hover-line-y{top:0;bottom:0;width:1px}.hover-point{position:absolute;width:9px;height:9px;border-radius:50%;border:2px solid var(--text);background:var(--bg);transform:translate(-50%,-50%)}.hover-card{position:absolute;max-width:160px;font-size:.78rem;color:var(--text);border:1px solid var(--border);background:var(--bg-elev);border-radius:8px;padding:6px 8px;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.error{color:#fecaca;border-color:#ef4444}.mobile-only{display:none}@media (max-width: 960px){.layout{display:block;position:relative}.sidebar{position:fixed;inset:61px 0 0 auto;width:min(380px,100vw);transform:translate(100%);transition:transform .2s ease;z-index:6;border-left:1px solid var(--border);border-right:none;box-shadow:-8px 0 30px #00000047}.sidebar.open{transform:translate(0)}.graph-area{--graph-pad: 8px;height:calc(100vh - 60px)}.mobile-only{display:inline-flex}}