:root{--canvas:#0b0b0c;--surface:#121215;--surface-2:#18181c;--ink:#f5f1e8;--ink-dim:#9d9b96;--signal:#ff5a1f;--signal-hell:#ff8a4c;--cobalt:#6f8cff;--ok:#3ccf7a;--bad:#ff4d4d;--line:#f5f1e81f;--display:"Arial Black", "Helvetica Neue", system-ui, sans-serif;--text:Arial, Helvetica, system-ui, sans-serif;--mono:SFMono-Regular, Consolas, monospace;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body{background:var(--canvas);height:100%;color:var(--ink);font:16px/1.4 var(--text);margin:0}body{-webkit-tap-highlight-color:transparent;overflow:hidden}button{font:inherit;color:inherit;cursor:pointer}:focus-visible{outline:2px solid var(--cobalt);outline-offset:2px}.eyebrow{font:700 11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-dim)}.badge-proto{font:700 10px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;border:1px solid var(--signal);color:var(--signal-hell);background:#0b0b0cb3;padding:5px 7px}.topbar{z-index:20;pointer-events:none;align-items:center;gap:12px;padding:12px 16px;display:flex;position:absolute;inset:0 0 auto}.topbar>*{pointer-events:auto}.topbar .brand{font:900 14px/1 var(--display);letter-spacing:-.01em;white-space:nowrap}@media (max-width:420px){.topbar{gap:8px;padding:10px 12px}.progress i{width:16px}.progress .count{display:none}}.topbar .brand a{color:inherit;text-decoration:none}.topbar .spacer{flex:1}.progress{align-items:center;gap:6px;display:flex}.progress i{background:var(--line);width:22px;height:6px;transition:background .2s,transform .25s;display:block}.progress i.done{background:var(--ok)}.progress i.now{background:var(--signal)}.progress i.pop{animation:.45s cubic-bezier(.2,1.6,.4,1) pop}.progress .count{font:700 12px/1 var(--mono);color:var(--ink-dim);margin-left:6px}@keyframes pop{0%{transform:scaleY(1)}40%{transform:scaleY(2.6)}to{transform:scaleY(1)}}.card{z-index:20;border:1px solid var(--line);border-top:3px solid var(--signal);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#121215f0;width:min(560px,100% - 24px);padding:14px 16px 16px;position:absolute;bottom:16px;left:50%;transform:translate(-50%);box-shadow:8px 8px #00000073}.card.ok{border-top-color:var(--ok)}.card.shake{animation:.38s shake}@keyframes shake{20%{transform:translate(calc(-50% - 8px))}40%{transform:translate(calc(7px - 50%))}60%{transform:translate(calc(-50% - 4px))}80%{transform:translate(calc(2px - 50%))}}.card h2{font:900 20px/1.15 var(--display);letter-spacing:-.01em;margin:6px 0}.card p{margin:0}.card .task{font-size:16px}.card .feedback{border-left:3px solid var(--ink-dim);background:var(--surface-2);margin-top:10px;padding:8px 10px;font-size:15px}.card .feedback.ok{border-left-color:var(--ok)}.card .feedback.bad{border-left-color:var(--bad)}.card .feedback.hint{border-left-color:var(--cobalt)}.card .feedback:empty{display:none}.card .source{font:11px/1.3 var(--mono);color:var(--ink-dim);margin-top:8px}.choices{gap:8px;margin-top:12px;display:grid}.choices button{text-align:left;background:var(--surface-2);border:1px solid var(--line);min-height:48px;padding:10px 12px;transition:border-color .15s,background .15s,transform .1s}.choices button:hover{border-color:var(--signal)}.choices button:active{transform:translateY(1px)}.choices button.wrong{border-color:var(--bad);color:var(--ink-dim);cursor:default;text-decoration:line-through}.choices button.right{border-color:var(--ok);background:#3ccf7a1f}.actions{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.btn{border:1px solid var(--line);background:var(--surface-2);min-height:48px;padding:0 18px;font-weight:700}.btn.primary{background:var(--signal);border-color:var(--signal);color:#120a05}.btn.primary:hover{background:var(--signal-hell)}.btn[hidden]{display:none}.spark{z-index:30;pointer-events:none;background:var(--ok);width:8px;height:8px;position:fixed}.end{z-index:40;background:#0b0b0ce0;place-items:center;padding:16px;display:grid;position:absolute;inset:0}.end[hidden]{display:none}.end .panel{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--ok);width:min(520px,100%);padding:20px;box-shadow:10px 10px #00000080}.end .big{font:900 56px/1 var(--display);letter-spacing:-.03em}.end .row{border-bottom:1px solid var(--line);justify-content:space-between;padding:8px 0;font-size:15px;display:flex}.end label{color:var(--ink-dim);margin-top:14px;font-size:13px;display:block}.end input{background:var(--canvas);width:100%;min-height:44px;color:var(--ink);border:1px solid var(--line);margin-top:4px;padding:0 10px;font-size:16px}.end .note{color:var(--ink-dim);margin-top:10px;font-size:12px}.disclaimer{z-index:15;font:10px/1.2 var(--mono);color:var(--ink-dim);text-align:right;pointer-events:none;max-width:46ch;position:absolute;bottom:6px;right:10px}@media (prefers-reduced-motion:reduce){.card.shake,.progress i.pop{animation:none}}