:root{--bg: #0a1620;--panel-bg: #0f2230;--panel-line: #1d3a4f;--text: #dfe9ef;--text-dim: #8a9bab;--accent: #4c72b0;--good: #55a868;--bad: #c44e52;--panel-w: 340px}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:14px;line-height:1.45;overflow:hidden}#app{display:flex;width:100vw;height:100vh;overflow:hidden}.lake-wrap{flex:1 1 auto;min-width:0;width:100%;height:100vh;position:relative;overflow:hidden}.lake{display:block;width:100%;height:100%}.panel{flex:0 0 var(--panel-w);width:var(--panel-w);height:100%;overflow-y:auto;background:var(--panel-bg);border-left:1px solid var(--panel-line);padding:0;display:flex;flex-direction:column;gap:0}.panel-head{padding:18px 18px 12px;border-bottom:1px solid var(--panel-line)}.panel-head h1{margin:0 0 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var(--panel-w);width:var(--panel-w);height:100vh;overflow:hidden}.panel-slot:empty{display:none}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#050f19b3;backdrop-filter:blur(2px);z-index:10;padding:20px}.overlay-card{background:var(--panel-bg);border:1px solid var(--panel-line);border-radius:10px;padding:28px 32px;max-width:460px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:0 20px 60px #0006}.overlay-card h2{margin:0 0 10px;font-size:22px;font-weight:600}.overlay-intro{margin:0 0 22px;color:var(--text-dim);font-size:13px;line-height:1.5}.form-grid{display:flex;flex-direction:column;gap:14px;margin-bottom:24px}.form-row{display:grid;grid-template-columns:1fr 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22px;color:var(--text);font-size:14px;line-height:1.45}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:24px;text-align:left}.result-cell{background:#ffffff0a;border:1px solid var(--panel-line);border-radius:6px;padding:10px 12px}.result-cell-label{font-size:11px;color:var(--text-dim);text-transform:uppercase;letter-spacing:.06em}.result-cell-val{font-size:18px;color:var(--text);font-variant-numeric:tabular-nums;margin-top:2px}.help-btn{position:fixed;top:14px;left:14px;z-index:50;width:30px;height:30px;border-radius:50%;border:1px solid var(--panel-line);background:#0f2230d9;color:var(--text);font-size:15px;font-weight:600;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,border-color 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