.demo-page{background:radial-gradient(circle at 74% 12%,rgba(185,255,90,.1),transparent 24rem),var(--bg)}
.demo-main{max-width:1080px}.demo-intro{display:grid;grid-template-columns:1.2fr .8fr;gap:50px;align-items:end;padding:clamp(64px,9vw,112px) 0 58px}.demo-intro h1{margin:0;font-size:clamp(3rem,7.8vw,6.6rem);line-height:.96;letter-spacing:-.07em}.demo-intro h1 span{color:var(--muted)}.demo-intro>div>p:last-child{max-width:720px;margin:28px 0 0;color:#c5cad0;font-size:1.08rem}.demo-loop{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:10px;color:var(--muted);font-size:.82rem}.demo-loop span{padding:9px 12px;background:var(--panel);border:1px solid var(--line);border-radius:999px}.demo-loop b{color:var(--accent)}
.demo-workbench{overflow:hidden;background:#101318;border:1px solid var(--line);border-radius:30px;box-shadow:0 30px 90px rgba(0,0,0,.28)}.demo-toolbar{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:24px 28px;border-bottom:1px solid var(--line)}.demo-kicker{margin:0 0 7px;color:var(--accent);font:600 .72rem/1.2 ui-monospace,monospace;letter-spacing:.11em}.demo-toolbar h2{margin:0;font-size:1.25rem}.demo-progress{min-width:160px;color:var(--muted);font-size:.82rem;text-align:right}.demo-progress-track{height:5px;margin-top:9px;overflow:hidden;background:#2a3038;border-radius:999px}.demo-progress-track i{display:block;width:50%;height:100%;background:var(--accent);border-radius:inherit;transition:width .3s ease}
.demo-grid{display:grid;grid-template-columns:minmax(0,1.38fr) minmax(280px,.62fr)}.quiz-panel{min-height:570px;padding:clamp(28px,5vw,56px)}#quiz-form[hidden]{display:none}fieldset{margin:0;padding:0;border:0}legend{max-width:760px;margin-bottom:30px;font-size:clamp(1.45rem,3vw,2.25rem);font-weight:700;line-height:1.35;letter-spacing:-.025em}.answer-list{display:grid;gap:12px}.answer-list label{display:block;cursor:pointer}.answer-list input{position:absolute;opacity:0;pointer-events:none}.answer-list span{display:flex;align-items:center;gap:15px;min-height:60px;padding:12px 16px;color:#d9dde2;background:#171b21;border:1px solid var(--line);border-radius:14px;transition:border-color .18s ease,background .18s ease,transform .18s ease}.answer-list span b{display:grid;place-items:center;width:34px;height:34px;flex:0 0 auto;color:var(--muted);background:#0d1014;border-radius:9px}.answer-list label:hover span{transform:translateY(-1px);border-color:#4f5965}.answer-list input:focus-visible+span{outline:3px solid rgba(185,255,90,.35);outline-offset:2px}.answer-list input:checked+span{color:#fff;background:#1d2517;border-color:var(--accent)}.answer-list input:checked+span b{color:#0b0d10;background:var(--accent)}.answer-list input:disabled+span{cursor:default;opacity:.72}.answer-hint{margin:18px 0 24px;color:var(--muted);font-size:.86rem}.quiz-submit{border:0;cursor:pointer}.quiz-submit:disabled{cursor:not-allowed;opacity:.42;transform:none}
.quiz-feedback{padding:4px 0}.feedback-status{display:inline-flex;margin:0 0 22px;padding:7px 11px;color:#0b0d10;background:var(--accent);border-radius:999px;font-size:.76rem;font-weight:750}.quiz-feedback.wrong .feedback-status{color:#fff;background:#c44b4b}.quiz-feedback h3{margin:0 0 14px;font-size:clamp(1.65rem,3vw,2.5rem);line-height:1.15}.quiz-feedback>p:not(.feedback-status){margin:0;color:var(--muted);font-size:1.02rem}.structure-signal{margin:28px 0;padding:20px;background:#171b21;border-left:3px solid var(--accent);border-radius:0 14px 14px 0}.structure-signal span{display:block;margin-bottom:8px;color:var(--muted);font-size:.75rem}.structure-signal strong{font-size:1.02rem;line-height:1.5}.quiz-feedback .button{border:0;cursor:pointer}
.demo-trace{padding:38px 28px;background:#0c0f13;border-left:1px solid var(--line)}.demo-trace h3{margin:0 0 28px;font-size:1.3rem}.demo-trace ol{display:grid;gap:8px;margin:0;padding:0;list-style:none}.demo-trace li{display:grid;grid-template-columns:34px 1fr;gap:12px;padding:14px;color:#78818c;border:1px solid transparent;border-radius:14px;transition:.22s ease}.demo-trace li>span{font:600 .72rem/1.4 ui-monospace,monospace}.demo-trace li strong{color:inherit;font-size:.9rem}.demo-trace li p{margin:4px 0 0;font-size:.78rem;line-height:1.45}.demo-trace li.active{color:#f3f5f7;background:#171b21;border-color:var(--line)}.demo-trace li.done{color:#b9ff5a}.trace-note{margin:28px 0 0;padding-top:22px;color:var(--muted);border-top:1px solid var(--line);font-size:.78rem}.demo-disclosure{display:flex;align-items:flex-start;justify-content:space-between;gap:42px;padding:44px 0 100px}.demo-disclosure p{max-width:760px;margin:0;color:var(--muted)}.demo-disclosure strong{color:var(--text)}.demo-disclosure .text-link{flex:0 0 auto}
@media(max-width:760px){.demo-intro,.demo-grid{grid-template-columns:1fr}.demo-loop{justify-content:flex-start}.demo-toolbar{align-items:flex-start;flex-direction:column}.demo-progress{width:100%;text-align:left}.quiz-panel{min-height:540px;padding:30px 20px}.demo-trace{border-top:1px solid var(--line);border-left:0}.demo-disclosure{flex-direction:column}.demo-workbench{border-radius:22px}}
@media(prefers-reduced-motion:reduce){.demo-progress-track i,.answer-list span,.demo-trace li{transition:none}}