:root{--bg: #15100e;--panel: #221917;--line: #3a2b27;--ink: #f6efe9;--dim: #c0a89c;--accent: #c0533a;--accent2: #e07a5f;--good: #4ea36b;--bad: #c0533a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#2a1d18,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:540px;padding:14px 14px 28px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:27px;letter-spacing:4px;font-weight:800;color:var(--accent2)}.sub{margin:4px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:12px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden;flex-wrap:wrap}.seg button{background:none;border:none;color:var(--dim);padding:6px 12px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#fff}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:9px 16px;border-radius:999px;font:700 14px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent2)}.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn.right{border-color:var(--good)}.btn.right:hover{background:var(--good);color:#fff}.btn.wrong{border-color:var(--bad)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:10px 0 4px}.readout{background:#1a1310;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;margin-top:10px}.card-face{width:100%;max-width:460px;min-height:280px;background:linear-gradient(180deg,#271d19,#1d1512);border:1px solid var(--line);border-radius:18px;padding:22px 22px 24px;display:flex;flex-direction:column;align-items:center;box-shadow:0 12px 28px #00000059}.deckname{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--dim)}.term{font-size:21px;font-weight:700;text-align:center;margin:18px 6px;line-height:1.4;flex:0 0 auto}.answer{font-size:19px;font-weight:700;color:var(--good);text-align:center;margin:4px 6px 12px;line-height:1.4}.answer.hidden,.confrow.hidden,.graderow.hidden,.overlay.hidden{display:none}.prompt{color:var(--dim);font-size:13px;margin:8px 0;text-align:center}.confrow{margin-top:auto;width:100%}.conf{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.conf button{background:var(--panel);border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:10px 0 8px;cursor:pointer;font:800 20px ui-monospace,monospace;display:flex;flex-direction:column;align-items:center;gap:3px}.conf button small{font:600 9px system-ui;color:var(--dim);letter-spacing:.3px}.conf button:hover{border-color:var(--accent2);background:#2c211d}.graderow{margin-top:auto;width:100%}.judge{display:flex;gap:10px;justify-content:center}.judge .btn{flex:1;max-width:180px}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0c0806d1;border-radius:18px;backdrop-filter:blur(3px)}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px 28px;text-align:center;max-width:340px}.card h2{margin:0 0 8px;font-size:24px;color:var(--accent2)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:16px}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:16px;line-height:1.6}.hint b{color:var(--accent2)}