:root{--bg: #14100a;--panel: #221b12;--line: #3a2e1d;--ink: #f4ece0;--dim: #b6a489;--accent: #c0843a;--accent2: #e0a85a;--ok: #6fcf97;--bad: #e07a6a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#2a2013,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:520px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:27px;letter-spacing:5px;font-weight:800;color:var(--accent2)}.sub{margin:3px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:10px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 15px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#1a1206}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:8px 18px;border-radius:999px;font:700 14px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.btn.primary{background:var(--accent);color:#1a1206;border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:#1a140c;border:1px solid var(--line);border-radius:8px;padding:5px 16px;font:800 18px ui-monospace,monospace;color:var(--accent2);min-width:86px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative;display:flex;justify-content:center}.panel{width:min(94vw,460px);background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px}.prompt{margin-bottom:12px}.targetcard{background:#1a140c;border:1px solid var(--line);border-radius:10px;padding:12px 14px}.tlabel{font:700 11px system-ui;letter-spacing:2px;color:var(--accent)}.tname{font-size:22px;font-weight:800;margin:4px 0}.tsym{color:var(--accent2);font-size:16px}.tneed{color:var(--dim);font-size:12.5px}.cardprops{list-style:none;display:flex;gap:10px;padding:6px 0;margin:6px 0}.cardprops li{flex:1;background:#221a10;border:1px solid var(--line);border-radius:8px;text-align:center;padding:7px 2px}.cardprops li span{display:block;font-size:10.5px;color:var(--dim);letter-spacing:.5px}.cardprops li b{font-size:22px;color:var(--accent2)}.atom{position:relative;height:96px;display:flex;align-items:center;justify-content:center;margin:6px 0 12px}.shell{position:absolute;width:150px;height:84px;border:1px dashed var(--line);border-radius:50%}.nucleus{background:radial-gradient(circle at 35% 30%,var(--accent2),var(--accent));color:#1a1206;font:800 14px ui-monospace,monospace;padding:12px 14px;border-radius:50%;min-width:58px;text-align:center;box-shadow:0 0 18px #c0843a80}.electrons-line{position:absolute;inset:0}.edot{position:absolute}.electrons-line{display:flex;align-items:center;justify-content:center;gap:5px}.edot{position:static;width:7px;height:7px;border-radius:50%;background:#7fc6ff;box-shadow:0 0 6px #7fc6ff}.particles{display:grid;gap:8px}.prow{display:flex;align-items:center;justify-content:space-between;background:#1a140c;border:1px solid var(--line);border-radius:9px;padding:8px 12px}.plabel{font-weight:700;font-size:14px}.stepper{display:flex;align-items:center;gap:10px}.stepper .step{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--ink);font:800 18px ui-monospace;cursor:pointer}.stepper .step:hover{border-color:var(--accent);color:var(--accent2)}.pval{min-width:30px;text-align:center;font:800 20px ui-monospace,monospace;color:var(--accent2)}.readback{margin:12px 0 2px;min-height:20px;font-size:13.5px;color:var(--ink);text-align:center}.readback b{color:var(--accent2)}.rbdim{color:var(--dim)}.rbbad{color:var(--bad)}.status{min-height:18px;text-align:center;font-size:13px;margin:4px 0}.status.ok{color:var(--ok)}.status.bad{color:var(--bad)}.actions{display:flex;gap:10px;justify-content:center;margin-top:8px}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0c0905cc;border-radius:14px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:340px}.card h2{margin:0 0 8px;font-size:26px;color:var(--accent2)}.card p{margin:6px 0;color:var(--ink);font-size:14px;line-height:1.6}.card .row{display:flex;gap:8px;justify-content:center;margin-top:16px}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:14px;line-height:1.6}