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var(--blue)}.math-skill-card.mastered{border-top-color:var(--teal);background:linear-gradient(180deg,#fff,#f1fbf7)}.math-skill-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start}.math-skill-head h2{margin:8px 0 4px}.math-skill-head p{margin:0;color:var(--muted)}.math-skill-symbol{display:grid;place-items:center;flex:0 0 50px;width:50px;height:50px;border-radius:16px;background:var(--sky);color:var(--navy);font-size:1.6rem}.math-skill-progress{border-left:4px solid var(--gold);background:#fff8e8;border-radius:0 11px 11px 0;padding:10px}.math-skill-progress span,.math-skill-progress strong{display:block}.math-skill-progress span{color:#6c5c2b;font-size:.76rem;text-transform:uppercase;letter-spacing:.05em}.math-skill-progress strong{margin-top:3px;color:#3c310e}.math-skill-metrics{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:.82rem}.math-skill-card .btn{margin-top:auto;width:100%}.math-workspace{scroll-margin-top:18px;padding:20px}.math-workspace-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.math-workspace-head h2{margin:8px 0 4px}.math-workspace-head p{margin:0;color:var(--muted)}.math-stage-progress{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px;margin:18px 0}.math-stage-progress>span{position:relative;display:grid;place-items:center;min-height:64px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--muted);font-weight:900}.math-stage-progress>span small{display:block;margin-top:3px;text-align:center;font-size:.68rem;font-weight:700}.math-stage-progress>span.active{border-color:var(--blue);background:var(--sky);color:var(--navy);box-shadow:0 0 0 2px rgba(31,111,159,.1)}.math-stage-progress>span.done{border-color:#91c8ad;background:#eff9f3;color:#236044}.math-lesson-grid{display:grid;grid-template-columns:minmax(0,1fr) 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0}.math-answer-field>span{display:block;margin-bottom:6px;color:var(--navy);font-weight:800}.math-answer-field>div,.math-set-question label>div{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;border:1px solid #b8ccd6;border-radius:12px;background:#fff;overflow:hidden}.math-answer-field input,.math-set-question input{width:100%;border:0;padding:13px;font:inherit;outline:none}.math-answer-field strong,.math-set-question label strong{padding:0 13px;color:var(--muted);font-size:.82rem}.math-inline-actions{display:flex;justify-content:flex-end;gap:9px;flex-wrap:wrap;margin-top:12px}.math-hint,.math-feedback{margin-top:13px;border-radius:12px;padding:12px}.math-hint{border:1px solid #dcc66e;background:#fff9df}.math-hint p,.math-feedback p{margin-bottom:0}.math-feedback.correct{border:1px solid #89c4a4;background:#eff9f3;color:#205d45}.math-feedback.retry{border:1px solid #dfbd58;background:#fff8e8;color:#674d10}.math-question-list{display:grid;gap:12px;margin:16px 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6px}.math-answer-review{display:grid;gap:8px;margin-top:12px}.math-answer-review details{border:1px solid var(--line);border-radius:10px;padding:9px 11px}.math-answer-review details.correct{border-left:4px solid var(--teal)}.math-answer-review details.retry{border-left:4px solid var(--gold)}.math-answer-review summary{cursor:pointer;font-weight:800}.math-complete-card{text-align:center;border:1px solid #8bc6a6;border-radius:20px;background:linear-gradient(145deg,#effaf4,#fff);padding:26px}.math-medal{font-size:4rem;filter:drop-shadow(0 8px 10px rgba(116,81,10,.18))}.math-complete-card h2{margin:9px 0}.math-complete-card p{max-width:60ch;margin-inline:auto}.math-complete-card small{color:var(--muted)}body.math-award-open{overflow:hidden}.math-award-overlay[hidden]{display:none}.math-award-overlay{position:fixed;inset:0;z-index:1200;display:grid;place-items:center;padding:20px;background:rgba(7,25,45,.78);backdrop-filter:blur(4px)}.math-award{position:relative;width:min(560px,100%);border:1px solid #e4c25b;border-radius:24px;background:radial-gradient(circle at top,#fff7c9,#fff 58%);padding:28px;text-align:center;box-shadow:0 28px 80px rgba(0,0,0,.34);outline:none;animation:mathAwardRise .3s ease-out}.math-award .icon-close{position:absolute;top:12px;right:12px;border-color:#b5942d;color:#6b5211;background:#fff}.math-award-medal{font-size:5.5rem;filter:drop-shadow(0 10px 14px rgba(116,81,10,.25))}.math-award h2{margin:10px 0 4px}.math-award blockquote{margin:16px auto;border-left:4px solid var(--gold);max-width:42ch;padding:10px 14px;text-align:left;background:#fff9e5;color:#49380e;font-weight:750}.math-award .actions{justify-content:center}@keyframes 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