:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#1f2a37;--panel:#2b3645;--panel-strong:#344253;--panel-soft:#3e4c5e;--text:#f7fafc;--muted:#b8c4d2;--line:#4c5a6c;--accent:#15b77f;--accent-strong:#0f9f6f;--warning:#f7b955;--danger:#f07178;--code:#111c29;--focus:#69a7ff;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{background:var(--bg);min-width:320px;color:var(--text);margin:0}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}.app-shell{grid-template-columns:360px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{background:#192432;border-right:1px solid #ffffff14;padding:28px 20px;overflow-y:auto}.brand-block{margin-bottom:24px}.set-switcher{gap:8px;margin-bottom:20px;display:grid}.set-button{background:var(--panel);width:100%;min-height:50px;color:var(--text);text-align:left;border:1px solid #0000;border-radius:8px;gap:2px;padding:9px 12px;display:grid}.set-button span{font-weight:900}.set-button small{color:var(--muted);font-weight:700}.set-button:hover,.set-button.active{border-color:var(--accent);background:var(--panel-strong)}.eyebrow{color:var(--accent);letter-spacing:.08em;text-transform:uppercase;margin:0 0 8px;font-size:.76rem;font-weight:800}h1,h2,p{margin-top:0}h1{margin-bottom:0;font-size:2rem;line-height:1.08}h2{max-width:980px;margin-bottom:0;font-size:2rem;line-height:1.22}.overall-progress{margin-bottom:22px}.reset-button{border:1px solid var(--line);width:100%;min-height:34px;color:var(--muted);background:0 0;border-radius:8px;margin-top:10px;font-size:.84rem;font-weight:800}.reset-button:hover{background:var(--panel);color:var(--text)}.progress-copy{color:var(--muted);justify-content:space-between;margin-bottom:8px;font-size:.9rem;font-weight:700;display:flex}.track{background:#334251;border-radius:999px;height:9px;overflow:hidden}.track-fill{border-radius:inherit;background:var(--accent);height:100%;transition:width .18s}.module-list{gap:8px;display:grid}.module-button,.choice,.primary-button,.secondary-button,.ghost-button{color:var(--text);border:0}.module-button{width:100%;min-height:46px;color:var(--muted);text-align:left;background:0 0;border-radius:8px;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px;display:flex}.module-button span:first-child{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.module-button span:last-child{color:#d8e0ea;flex:none;font-size:.82rem;font-weight:800}.module-button:hover,.module-button.active{background:var(--panel);color:var(--text)}.quiz-area{align-content:start;gap:24px;padding:48px clamp(22px,5vw,72px);display:grid}.quiz-topline{justify-content:space-between;align-items:flex-start;gap:24px;display:flex}.question-meta{flex:none;gap:8px;padding-top:6px;display:flex}.question-meta span{border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:8px 12px;font-size:.82rem;font-weight:800}.choice-list{gap:12px;max-width:1040px;display:grid}.two-choice{max-width:680px}.choice{background:var(--panel-soft);text-align:left;border:2px solid #0000;border-radius:8px;align-items:center;gap:16px;min-height:74px;padding:16px 22px;transition:background .15s,border-color .15s,transform .15s;display:flex}.choice:hover{background:#4a596b}.choice.selected{border-color:var(--accent);background:var(--panel-strong)}.radio-dot{width:22px;height:22px;box-shadow:inset 0 0 0 5px var(--panel-soft);background:#f7fafc;border:2px solid #f7fafc;border-radius:50%;flex:none;place-items:center;display:inline-grid}.choice.selected .radio-dot{background:var(--accent);box-shadow:inset 0 0 0 4px var(--panel-strong)}.choice span:last-child{overflow-wrap:anywhere;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:clamp(1rem,1.8vw,1.35rem);line-height:1.4}.code-task{gap:16px;max-width:1080px;display:grid}pre,textarea,input{background:var(--code);color:var(--text);border:1px solid #ffffff14;border-radius:8px;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:clamp(.92rem,1.6vw,1.2rem);line-height:1.65}pre{white-space:pre-wrap;margin:0;padding:22px;overflow-x:auto}textarea{resize:vertical;width:100%;min-height:250px;padding:18px}input{width:100%;min-height:48px;padding:8px 12px}textarea:focus,input:focus,button:focus-visible{outline:3px solid var(--focus);outline-offset:2px}.blank-grid{grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;display:grid}.blank-grid label{gap:8px;display:grid}.blank-grid span{color:var(--muted);font-size:.86rem;font-weight:800}.feedback{border-left:5px solid var(--warning);background:var(--panel);border-radius:8px;max-width:1080px;padding:18px 20px}.feedback.correct{border-left-color:var(--accent)}.feedback.incorrect{border-left-color:var(--danger)}.feedback strong{margin-bottom:6px;font-size:1.05rem;display:block}.feedback p{color:var(--muted);margin-bottom:12px;line-height:1.6}.feedback pre{margin-top:10px}.actions{justify-content:space-between;align-items:center;gap:12px;max-width:1080px;padding-top:4px;display:flex}.action-cluster{gap:10px;display:flex}.primary-button,.secondary-button,.ghost-button{border-radius:8px;min-height:46px;padding:0 18px;font-weight:800}.primary-button{background:var(--accent)}.primary-button:hover{background:var(--accent-strong)}.secondary-button,.ghost-button{background:var(--panel-soft)}.ghost-button{color:#dbe5ef}.secondary-button:hover,.ghost-button:hover{background:#4a596b}@media (width<=980px){.app-shell{grid-template-columns:1fr}.sidebar{border-bottom:1px solid #ffffff14;border-right:0;max-height:none;padding:22px}.module-list{grid-template-columns:repeat(2,minmax(0,1fr))}.quiz-topline,.actions{flex-direction:column;align-items:stretch}.question-meta,.action-cluster{justify-content:flex-start}}@media (width<=640px){h1{font-size:1.55rem}h2{font-size:1.35rem}.quiz-area{padding:28px 16px}.module-list{grid-template-columns:1fr}.choice{min-height:62px;padding:14px}.actions,.action-cluster{grid-template-columns:1fr;display:grid}}