:root{--bg:#0e1116;--panel:#161b22;--border:#263041;--text:#e6edf3;--muted:#8b949e;--accent:#2962ff;--green:#26a69a;--red:#ef5350}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border)}.topbar .brand{font-weight:700;letter-spacing:.3px}.topbar .brand span{color:var(--accent)}.topbar .user{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:14px}.btn{background:var(--accent);color:#fff;border:0;border-radius:6px;padding:8px 14px;font-size:14px;cursor:pointer}.btn.secondary{background:#21262d;border:1px solid var(--border);color:var(--text)}.btn:disabled{opacity:.5;cursor:not-allowed}.center{min-height:100vh;display:grid;place-items:center}.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:40px;max-width:420px;text-align:center}.card h1{margin:0 0 8px;font-size:22px}.card p{color:var(--muted);margin:0 0 24px;font-size:14px;line-height:1.5}.layout{display:grid;grid-template-columns:320px 1fr;height:calc(100vh - 53px)}.sidebar{background:var(--panel);border-right:1px solid var(--border);padding:16px;overflow-y:auto}.chartwrap{position:relative}#chart{width:100%;height:100%}.field{margin-bottom:14px}.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.4px}.field input,.field select{width:100%;background:#0d1117;color:var(--text);border:1px solid var(--border);border-radius:6px;padding:8px 10px;font-size:14px}.row{display:flex;gap:10px}.row>*{flex:1 1}.stats{margin-top:18px;border-top:1px solid var(--border);padding-top:14px}.stat{display:flex;justify-content:space-between;font-size:14px;padding:4px 0}.stat .k{color:var(--muted)}.pos{color:var(--green)}.err,.neg{color:var(--red)}.err{font-size:13px;margin-top:10px}.hint{color:var(--muted);font-size:12px;margin-top:6px;line-height:1.4}