:root{--bg: #101218;--panel: #171a23;--panel-2: #1f232e;--panel-3: #2a2f3d;--border: #333a4a;--text: #e8ecf6;--muted: #9aa3b8;--accent: #7c8cf8;--accent-soft: #a5b1fb;--on-accent: #10121b;--danger: #d4756a;--warn: #e0a95c;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 22px;border-bottom:1px solid var(--border)}.brand{font-weight:650;font-size:17px;letter-spacing:.2px}.logo{color:var(--accent);margin-right:6px}.privacy{font-size:13px;color:var(--muted)}.stage{flex:1;display:flex;align-items:center;justify-content:center;padding:40px}.dropzone{width:min(680px,90vw);padding:72px 40px;border:2px dashed var(--border);border-radius:16px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s;background:var(--panel)}.dropzone:hover,.dropzone.dragging{border-color:var(--accent);background:var(--panel-2)}.big{font-size:22px;font-weight:600;margin:0 0 8px}.hint{color:var(--muted);margin:0}.hint.small{font-size:13px;margin-top:14px;opacity:.75}.info-card{width:min(680px,90vw);background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:28px 32px}.info-card h2{margin:0 0 20px;font-size:18px;word-break:break-all}.info-card dl{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:0 0 26px}.info-card dt{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);margin-bottom:4px}.info-card dd{margin:0;font-size:20px}.info-card dd.warn{color:var(--warn)}.tc-note{display:block;font-size:12px;color:var(--muted);margin-top:4px;line-height:1.35}.tc-input,.rate-select{font:inherit;font-size:20px;font-variant-numeric:tabular-nums;background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:4px 8px;width:100%}.tc-input:focus,.rate-select:focus{outline:none;border-color:var(--accent)}.tc-input.invalid{border-color:var(--danger)}.actions{display:flex;gap:12px}button{font:inherit;font-size:15px;padding:10px 18px;border-radius:9px;border:1px solid var(--border);background:var(--panel-2);color:var(--text);cursor:pointer}button:hover:not(:disabled){background:var(--panel-3)}button.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent);font-weight:600}button.primary:hover:not(:disabled){background:var(--accent-soft)}button:disabled{opacity:.45;cursor:not-allowed}.footnote{margin:18px 0 0;font-size:13px;color:var(--muted)}.error{color:var(--danger);margin:0 0 20px}.stage.wide{align-items:stretch;padding:16px}.offscreen{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}.workspace{display:grid;grid-template-columns:640px 10px minmax(0,1fr);gap:8px;width:100%;align-items:start}.splitter{position:sticky;top:16px;height:calc(100vh - 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