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14px}.box-picked{align-items:center;gap:10px;margin:0 0 8px;display:flex}.bm{text-align:center;font:.8rem var(--mono);color:var(--text);border-radius:6px;padding:2px 4px 4px;position:relative}.bm-margin{background:color-mix(in srgb, var(--accent) 22%, var(--surface))}.bm-border{background:color-mix(in srgb, var(--muted) 25%, var(--surface))}.bm-padding{background:color-mix(in srgb, var(--good) 22%, var(--surface))}.bm-name{font:600 .7rem var(--font);position:absolute;top:2px;left:6px}.bm-row{align-items:center;gap:2px;display:flex}.bm-row>.bm,.bm-content{flex:1;min-width:0}.bm-v{min-width:26px;line-height:1.6;display:inline-block}.bm-content{background:color-mix(in srgb, var(--brand) 28%, var(--surface));border-radius:4px;padding:10px 4px;font-weight:700}.clash-track{justify-content:space-between;align-items:center;gap:12px;margin:14px 0;display:flex}.clash-track .segmented button{min-width:64px}.tree-panel{background:var(--surface);border-top:1px solid var(--border);margin:0;padding:8px 12px 12px}.tree,.tree ul{margin:0;padding:0;list-style:none}.tree ul{border-left:2px solid var(--border);margin-left:18px;padding-left:8px}.tree-node{width:100%;min-height:var(--tap);color:var(--text);font:inherit;text-align:left;cursor:pointer;-webkit-tap-highlight-color:transparent;background:0 0;border:2px solid #0000;border-radius:10px;align-items:center;gap:8px;padding:0 8px;display:flex}.tree-node.on{border-color:var(--accent);background:color-mix(in srgb, var(--accent) 18%, transparent)}.tree-tag{background:var(--brand);color:var(--brand-ink);font:700 .95rem var(--mono);border-radius:6px;flex:none;padding:2px 10px}.tree-text{text-overflow:ellipsis;white-space:nowrap;min-width:0;font:.95rem var(--mono);color:var(--muted);overflow:hidden}.tree-warn{color:var(--bad);margin:10px 4px 0}.live-preview{border:0;border-top:1px solid var(--border);background:#fff;width:100%;height:200px;display:block}.preview-box{position:relative}.preview-box.sized{background:var(--code-bg);border-top:1px solid var(--border);overflow:hidden}.preview-box.sized .live-preview{transform-origin:0 0;border-top:0}.preview-size{background:var(--surface);color:var(--muted);border:1px solid var(--border);pointer-events:none;border-radius:999px;padding:2px 8px;position:absolute;bottom:6px;right:6px}.live-screens{justify-content:flex-start;gap:8px;min-height:0;padding-bottom:8px}.live-screens .segmented button{min-width:0;padding:0 10px}.prose h1{font-size:1.4rem}.prose h2{font-size:1.15rem}.prose{max-width:68ch}.card.prose{max-width:none}.card.prose>:not(.live-wrap){max-width:68ch}.prose blockquote{border-left:4px solid var(--accent);background:var(--code-bg);border-radius:6px;margin:12px 0;padding:8px 12px}.prose table{border-collapse:collapse;width:100%;margin:12px 0;font-size:.95rem}.prose th,.prose td{text-align:left;border-bottom:1px 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0;display:grid;position:sticky}.done-card{text-align:center;outline:none;padding:28px 20px}.done-icon{background:var(--good-bg);width:72px;height:72px;color:var(--good);border-radius:50%;place-items:center;margin:0 auto 8px;font-size:2.2rem;font-weight:800;display:grid}.done-icon.pop{animation:.42s ease-out pop}@keyframes pop{0%{opacity:0;transform:scale(.4)}70%{transform:scale(1.12)}to{transform:scale(1)}}@media (prefers-reduced-motion:reduce){.done-icon.pop{animation:none}}:root[data-calm] .done-icon.pop{animation:none}.done-actions{gap:10px;max-width:360px;margin:18px auto 0;display:grid}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.pill-accent{background:var(--accent);color:var(--accent-ink);font-weight:700}.challenge-num{background:var(--accent);color:var(--accent-ink);font-size:1.1rem}.eyebrow{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 4px;font-size:.8rem;font-weight:700}.challenge h2{margin:0 0 8px;font-size:1.1rem}.checks-head{justify-content:space-between;align-items:baseline;gap:12px;display:flex}.checks{gap:4px;margin:0;padding:0;list-style:none;display:grid}.checks li{align-items:center;gap:12px;min-height:44px;line-height:1.4;display:flex}.check-mark{border:2px solid var(--border);width:26px;height:26px;color:var(--good-bg);border-radius:50%;flex:none;place-items:center;font-size:.9rem;font-weight:800;display:grid}.checks li.ok .check-mark{background:var(--good);border-color:var(--good)}.checks code,.hints code{font-family:var(--mono);background:var(--code-bg);border-radius:4px;padding:1px 5px;font-size:.9em}.hints{gap:10px;margin:0 0 12px;padding-left:22px;display:grid}.hints:empty{display:none}.hint-btn{width:100%}.player-nav.single{grid-template-columns:1fr}.clash{max-width:640px}.clash-intro h1{margin-top:0}.clash-stats{grid-template-columns:1fr 1fr;gap:10px;margin:16px 0;display:grid}.clash-stats>div{background:var(--code-bg);border-radius:12px;flex-direction:column;padding:12px;display:flex}.stat-num{font-size:1.6rem;font-weight:800;line-height:1.2}.clash-start{width:100%;font-size:1.1rem}.clash-top{justify-content:space-between;align-items:center;min-height:36px;display:flex}.clash-score{text-align:center;background:var(--brand);min-width:56px;color:var(--brand-ink);border-radius:999px;padding:2px 12px;font-weight:800}.clash-timer{background:var(--border);border-radius:999px;height:10px;margin:6px 0 12px;overflow:hidden}.clash-timer-fill{border-radius:inherit;background:var(--brand);height:100%;transition:width .1s linear}.clash-timer-fill.low{background:var(--bad)}:root[data-calm] .clash-timer-fill{transition:none}@media (prefers-reduced-motion:reduce){.clash-timer-fill{transition:none}}.clash-prompt{font-size:1.1rem;font-weight:600}.clash-prompt p{margin:0 0 10px}.clash-code{margin:0 0 12px;font-size:.95rem}.clash-options{gap:10px;display:grid}.clash-option{border:2px solid var(--border);background:var(--surface);min-height:52px;color:var(--text);font:inherit;text-align:left;cursor:pointer;touch-action:manipulation;border-radius:12px;padding:10px 14px}.clash-option.mono{font-family:var(--mono)}.clash-option:active:not(:disabled){border-color:var(--brand)}.clash-option:disabled{cursor:default;color:var(--text)}.clash-option.correct{border-color:var(--good);background:var(--good-bg);font-weight:700}.clash-option.wrong{border-color:var(--bad);background:var(--bad-bg)}.clash-option.faded{opacity:.55}.clash-feedback{border-width:2px}.clash-feedback.good{border-color:var(--good)}.clash-feedback.bad{border-color:var(--bad)}.clash-verdict{margin:0 0 4px;font-size:1.15rem;font-weight:800}.clash-feedback.good .clash-verdict{color:var(--good)}.clash-feedback.bad 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button.on{background:var(--surface);color:var(--text);font-weight:600}.switch{appearance:none;background:var(--border);cursor:pointer;width:48px;height:28px;transition:background var(--ease);border-radius:999px;flex:none;position:relative}.switch:after{content:"";width:22px;height:22px;transition:transform var(--ease);background:#fff;border-radius:50%;position:absolute;top:3px;left:3px}.switch:checked{background:var(--brand)}.switch:checked:after{transform:translate(20px)}.options li.wrong{border-color:var(--bad);background:var(--bad-bg)}.xp-badge{background:var(--accent);color:var(--accent-ink);border-radius:999px;padding:2px 10px;font-size:.8rem;font-weight:700;display:inline-block}@media (width>=768px){:root{--rail:88px}.topbar{padding-left:calc(var(--rail) + 24px)}.tabbar{width:var(--rail);border-top:0;border-right:1px solid var(--border);flex-direction:column;justify-content:flex-start;gap:6px;padding:72px 8px 16px;top:0;bottom:0;right:auto}.tab{width:100%;min-width:0;padding:10px 0}.tab.active{background:var(--code-bg)}.screen{max-width:960px;padding:28px 32px 48px calc(var(--rail) + 32px)}h1{font-size:1.85rem}.lesson-list{grid-template-columns:repeat(2,1fr);gap:14px;display:grid}.lesson-list .card{height:100%;margin-bottom:0}.q-list{grid-template-columns:repeat(2,1fr);align-items:start;gap:14px;display:grid}.q-list .card{margin-bottom:0}.lesson,.clash,.settings-list{margin-inline:auto}.lesson{max-width:760px}.clash{max-width:720px}.live-wrap{margin:16px 0}.live-block{border:1px solid var(--border);border-radius:10px;overflow:hidden}.player-nav{grid-template-columns:160px 220px;justify-content:space-between;bottom:0}.player-nav.single{grid-template-columns:320px;justify-content:end}.settings-list{max-width:640px}a.card:hover{border-color:color-mix(in srgb, var(--brand) 35%, var(--border))}.clash-options{grid-template-columns:1fr 1fr}}@media (width>=1100px){:root{--rail:232px}.topbar{width:var(--rail);z-index:3;background:0 0;border-bottom:0;padding:16px 20px;position:fixed;top:0;left:0}.tabbar{padding:76px 12px 16px}.tab{flex-direction:row;justify-content:flex-start;gap:12px;padding:10px 14px;font-size:.95rem}.tab-icon{margin:0}.screen{max-width:calc(1120px + var(--rail));padding:40px 48px 64px calc(var(--rail) + 48px)}.lesson-list{grid-template-columns:repeat(3,1fr)}.lesson.challenge{max-width:1120px}.challenge-grid{grid-template-columns:minmax(0,1fr) 340px;align-items:start;gap:16px;display:grid}.challenge-side{max-height:calc(100dvh - 32px);position:sticky;top:16px;overflow-y:auto}.challenge-side .player-nav{background:0 0;grid-template-columns:1fr;padding:0;position:static}}:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.open-files{border-top:1px solid var(--border);margin-top:20px;padding-top:16px}.open-files h2{margin:0 0 4px;font-size:1.05rem}.open-files .btn{margin-top:4px}.open-files-notes{margin:12px 0 0;padding-left:20px}.open-files-notes li+li{margin-top:4px}.open-files-notes.bad{color:var(--bad)}.live-motion{justify-content:flex-start;gap:10px}.live-motion-state{flex:1;min-width:0}.live-motion-btn{min-width:72px;min-height:40px;padding:0 14px}.box-grid-cell{border:2px dashed var(--brand);position:absolute}.box-grid-info{margin:0 0 8px}