:root{--bg: #0c1318;--panel: #15212a;--line: #27353f;--ink: #eaf3f8;--dim: #8ba6b6;--accent: #4a9cc0;--good: #3fbf8f;--bad: #e06a78;--past: #c08a4a;--present: #4a9cc0;--future: #9b6ec0}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(960px 600px at 50% -10%,#122230,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center}#app{width:100%;max-width:560px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:30px;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:12px 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:#04161e}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:8px 16px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover:not(:disabled){border-color:var(--accent)}.btn:disabled{opacity:.45;cursor:default}.btn.primary{background:var(--accent);color:#04161e;border-color:var(--accent)}.scoreboard{display:flex;gap:8px;justify-content:center;margin:10px 0;flex-wrap:wrap}.readout{background:#070d12;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:78px;text-align:center}.readout span{color:var(--dim);font-size:10px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative}.prompt-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;text-align:center}.cue{color:var(--dim);font-size:14px;margin-bottom:10px}.cue b{color:var(--accent)}.cue i{color:var(--dim);font-style:italic}.sentence{font-size:clamp(17px,4.6vw,22px);font-weight:600;line-height:1.5;margin:6px 0 12px;min-height:1.5em}.sentence mark{background:#4a9cc038;color:#bfe4f2;padding:0 4px;border-radius:4px;font-weight:800}.tense-guess{color:var(--dim);font-size:13px;margin-bottom:14px}.tense-pill{display:inline-block;padding:1px 9px;border-radius:999px;font-weight:800;font-size:12px;color:#04161e}.tense-pill.past{background:var(--past)}.tense-pill.present{background:var(--present)}.tense-pill.future{background:var(--future)}#answerform{display:flex;gap:8px;justify-content:center}#answer{flex:1;max-width:280px;background:#070d12;border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:11px 14px;font:600 17px ui-monospace,monospace;outline:none}#answer:focus{border-color:var(--accent)}#answer:disabled{opacity:.6}.feedback{min-height:1.4em;margin-top:12px;font-weight:700;font-size:15px}.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}.controls{display:flex;gap:10px;justify-content:center;margin-top:16px}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#060b0fd1;border-radius:16px;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:360px}.card h2{margin:0 0 8px;font-size:24px;color:var(--accent)}.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:18px;line-height:1.6}.hint b{color:var(--ink)}