:root{--bg: #0d1018;--panel: #171c28;--line: #2a3242;--ink: #eef2f8;--dim: #93a1b8;--accent: #5a7ad0;--good: #4ec98a;--bad: #d9586a;--gold: #e7c15a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(1000px 600px at 50% -10%,#161d2c,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 14px 30px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:5px;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:#05101f}.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.primary{background:var(--accent);color:#05101f;border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:#090d14;border:1px solid var(--line);border-radius:8px;padding:5px 16px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:84px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative}.premises{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:10px}.premises h3{margin:0 0 6px;font-size:12px;letter-spacing:1px;color:var(--dim);text-transform:uppercase}.premises ul{margin:0;padding-left:18px}.premises li{font-size:16px;line-height:1.6}.premises li b{color:var(--accent)}.vennwrap{display:flex;justify-content:center;margin:6px 0 12px}#venn{width:min(92vw,420px);height:auto}.qhead{text-align:center;color:var(--dim);font-size:13px;margin:4px 0 8px}.choices{display:flex;flex-direction:column;gap:8px}.choice{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:11px 14px;cursor:pointer;font-size:16px;transition:border-color .12s,background .12s}.choice:hover{border-color:var(--accent)}.choice.sel{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.choice.right{border-color:var(--good);background:#14241c}.choice.wrong{border-color:var(--bad);background:#261419}.choice .tag{display:inline-block;margin-left:8px;font-size:12px;font-weight:700;padding:1px 8px;border-radius:999px}.choice .tag.valid{color:var(--good);background:#12281e}.choice .tag.invalid{color:var(--bad);background:#2a1419}.flagrow{margin-top:12px}.flagrow .label{color:var(--dim);font-size:13px;margin-bottom:6px}.flags{display:flex;flex-wrap:wrap;gap:6px}.flags button{background:#0a0f18;border:1px solid var(--line);color:var(--ink);padding:6px 11px;border-radius:999px;font:600 12px system-ui;cursor:pointer}.flags button:hover{border-color:var(--gold)}.flags button.picked{border-color:var(--gold);color:var(--gold)}.actions{display:flex;gap:8px;justify-content:center;margin-top:14px}.overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:#070a10cc;backdrop-filter:blur(3px);z-index:10}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px 28px;text-align:center;max-width:360px}.card h2{margin:0 0 6px;font-size:24px;color:var(--accent)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .big{color:var(--gold);font-size:30px;font-weight:800;margin:8px 0}.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:1.5}.feedback{text-align:center;min-height:22px;margin:8px 0;font-size:14px;font-weight:600}.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}.feedback.gold{color:var(--gold)}