:root{--bg: #140e14;--panel: #221a22;--line: #3a2c38;--ink: #f4eef2;--dim: #b59caf;--accent: #b05f8a;--accent2: #6fb0a6;--good: #2f5a4a;--bad: #5a1f33;--nuc: #3b5e8c;--elec: #8c5b3b}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#241624,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:560px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:6px;font-weight:800;color:var(--accent)}.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 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#1a0712}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.btn[disabled]{opacity:.4;cursor:default}.btn[hidden]{display:none}.btn.primary{background:var(--accent);color:#1a0712;border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:#0c060b;border:1px solid var(--line);border-radius:8px;padding:5px 16px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:78px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative}.target{display:flex;align-items:center;justify-content:center;gap:10px;margin:10px 0}.target .arrow{color:var(--accent);font-size:24px}.molchip{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 14px;min-width:96px;text-align:center}.molname{display:block;font-size:14px;color:var(--ink)}.molglyph{display:block;font:800 16px ui-monospace,monospace;color:var(--accent2);margin-top:2px}.molrole{display:block;color:var(--dim);font-size:11px;margin-top:3px}.route{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;min-height:22px;margin:4px 0 8px}.routestep{background:var(--good);color:#cdeede;border-radius:999px;padding:3px 10px;font-size:12px;font-weight:700}.routesep{color:var(--dim)}.routeempty{color:var(--dim);font-size:12px;font-style:italic}.prompt{text-align:center;color:var(--dim);font-size:14px;margin:8px 0;min-height:20px}.prompt.bad{color:#ff9ab4;font-weight:700}.options{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;margin:8px 0}.opt{background:var(--panel);border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:10px;text-align:left;cursor:pointer}.opt:hover{border-color:var(--accent)}.opt b{display:block;font-size:14px}.opt small{color:var(--dim);font-size:12px}.partners{display:flex;gap:10px;justify-content:center;margin:8px 0;flex-wrap:wrap}.partners.hidden{display:none}.partner{border-radius:10px;padding:12px 16px;cursor:pointer;border:1px solid var(--line);color:var(--ink);min-width:130px}.partner[data-role=nucleophile]{background:var(--nuc)}.partner[data-role=electrophile]{background:var(--elec)}.partner:hover{filter:brightness(1.15)}.partner b{display:block;font-size:14px}.partner small{font-size:12px;opacity:.85}.shelftitle{text-align:center;color:var(--dim);font-size:12px;margin:16px 0 6px}.shelf{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.shelfchip{min-width:80px;padding:8px 10px;opacity:.85}.shelfchip.reached{border-color:var(--accent2);box-shadow:0 0 0 2px var(--accent2) inset;opacity:1}.muted{color:var(--dim);text-align:center;font-size:13px}.hintreadout{text-align:center;color:var(--dim);font-size:12px;margin-top:10px}.note{text-align:center;color:var(--dim);font-size:11px;margin-top:14px;line-height:1.5;opacity:.8}.overlay{position:absolute;inset:-8px;display:flex;align-items:center;justify-content:center;background:#0c060bd1;border-radius:8px;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 6px;font-size:22px;color:var(--accent)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}