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(width>=1024px){.lesson-layout{grid-template-columns:8fr 4fr;align-items:start;gap:40px}}.lesson-aside{order:-1}.only-wide{display:none}@media (width>=1024px){.lesson-aside{order:0}.only-wide{display:block}}.crumbs{color:var(--ink-2);flex-wrap:wrap;align-items:center;gap:8px;font-size:.88rem;display:flex}.crumbs button{color:var(--ink-2);text-underline-offset:3px;background:0 0;border:0;padding:0;text-decoration:underline}.lesson-title{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;display:flex}.points{grid-template-columns:minmax(0,1fr);gap:12px;margin:0;padding:0;list-style:none;display:grid}@media (width>=1024px){.points{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}}.point{background:var(--card);border:1px solid var(--line);border-radius:var(--r);align-items:flex-start;gap:10px;padding:16px 18px;display:flex}.point .body{flex-direction:column;flex:1;gap:6px;min-width:0;display:flex}.point .fr{font-size:1.05rem;line-height:1.55}.point .fr strong{color:var(--bleu)}.point .vi{font-size:.95rem;line-height:1.5}.point .round-btn{width:40px;height:40px}.pretest{background:var(--card);border:1.5px solid var(--bleu);border-radius:var(--r);flex-direction:column;align-items:flex-start;gap:10px;padding:18px;display:flex}.pretest b{font-size:1rem}.pretest p{color:var(--ink-2);font-size:.92rem;line-height:1.5}.cloze{border:0;border-bottom:2px solid var(--bleu);background:var(--bleu-soft);min-width:3em;font:inherit;cursor:pointer;vertical-align:baseline;border-radius:6px;padding:0 4px;display:inline-block}.cloze.shown{background:var(--or-soft);border-bottom-color:var(--or);color:var(--ink)}.lesson-group{flex-direction:column;gap:10px;display:flex}.list-btn{text-align:left;background:var(--card);border:1px solid var(--line);border-radius:var(--r);width:100%;color:var(--ink);justify-content:space-between;align-items:center;gap:12px;padding:14px 16px;display:flex}.list-btn:hover{border-color:var(--bleu)}.list-btn>svg{color:var(--ink-3);flex:none}.list-btn .t{flex-direction:column;gap:2px;display:flex}.list-btn .t b{font-weight:600}.list-btn .t span{color:var(--ink-2);font-size:.85rem}.learn-groups{grid-template-columns:minmax(0,1fr);gap:24px;display:grid}@media (width>=1024px){.learn-groups{grid-template-columns:repeat(2,minmax(0,1fr))}}.visual{margin:0}.visual img{aspect-ratio:8/5;border-radius:var(--r);background:var(--bleu-soft);border:1px solid var(--line);width:100%;display:block}.visual figcaption{color:var(--ink-3);margin-top:6px;font-size:.8rem}.explain .visual img{max-width:440px}.strip{scroll-snap-type:x mandatory;scrollbar-width:thin;gap:12px;padding-bottom:8px;display:flex;overflow-x:auto}.strip .visual{scroll-snap-align:start;flex:0 0 min(300px,82%)}.side-visuals{flex-direction:column;gap:12px;display:flex}.gallery{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;display:grid}.gallery button{text-align:left;color:inherit;background:0 0;border:0;padding:0}.gallery button:hover img{border-color:var(--bleu)}.chip{border:1.5px solid var(--line);background:var(--card);border-radius:var(--r);text-align:left;color:var(--ink);min-height:58px;padding:12px 14px;transition:all .15s}.chip:hover:not(:disabled){border-color:var(--bleu)}.chip.sel{border:2px solid var(--bleu);background:var(--bleu-soft)}.chip.ok{border-color:var(--vert);background:var(--vert-soft);opacity:.6}.chip.bad{border-color:var(--rouge);background:var(--rouge-soft);animation:.4s shake}.stat{letter-spacing:-.02em;font-size:1.6rem;font-weight:800;line-height:1.2}.theme-row{border-bottom:1px solid var(--line);grid-template-columns:1fr auto;align-items:center;gap:12px;padding:12px 0;display:grid}.theme-row:last-child{border-bottom:0}.method{border-bottom:1px solid var(--line);grid-template-columns:1fr;gap:4px;padding:12px 0;display:grid}.method:last-child{border-bottom:0}.explain.ok{background:var(--vert-soft);border-color:#bfe3cb}.result-big{letter-spacing:-.03em;font-size:clamp(2.6rem,2rem + 3vw,3.4rem);font-weight:800;line-height:1}.card ul{flex-direction:column;gap:6px;margin:8px 0 0;padding-left:20px;display:flex}.card h2+*{margin-top:10px}.onb{background:var(--card);flex-direction:column;min-height:100vh;padding-top:4px;display:flex}@media (width>=1024px){.onb{flex-direction:row}}.onb-hero{background:var(--bleu);color:#fff;flex-direction:column;gap:18px;padding:28px 20px;display:flex}@media (width>=600px){.onb-hero{padding:36px 48px}}@media (width>=1024px){.onb-hero{flex:none;justify-content:space-between;width:560px;min-height:calc(100vh - 4px);padding:56px;position:sticky;top:4px}}.onb-hero h1{font-size:clamp(1.6rem,1.3rem + 1.5vw,2.5rem);line-height:1.15}.onb-hero p{color:#dde0ff;line-height:1.6}.onb-facts{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;display:grid}.onb-facts div{border-radius:var(--r);background:#ffffff1a;flex-direction:column;padding:12px 14px;display:flex}.onb-facts b{font-size:1.6rem}.onb-facts span{color:#dde0ff;font-size:.82rem}.onb-body{flex:1;justify-content:center;padding:28px 20px 32px;display:flex}@media (width>=600px){.onb-body{padding:36px 48px 40px}}@media (width>=1024px){.onb-body{padding:56px}}.onb-form{flex-direction:column;gap:24px;width:100%;max-width:600px;display:flex}.onb-form h2{letter-spacing:-.02em;font-size:clamp(1.5rem,1.3rem + .8vw,1.9rem);font-weight:800}.progress-dots{align-items:center;gap:16px;display:flex}.progress-dots .dots{flex:1;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;display:grid}.progress-dots .dots i{background:var(--line);border-radius:999px;height:6px}.progress-dots .dots i.on{background:var(--bleu)}.radio-cards{flex-direction:column;gap:12px;display:flex}.radio-card{border:1.5px solid var(--line);background:var(--card);text-align:left;min-height:68px;color:var(--ink);border-radius:16px;align-items:center;gap:16px;padding:14px 18px;display:flex}.radio-card.on{border:2px solid var(--bleu);background:var(--bleu-soft);padding:13.5px 17.5px}.radio-card .t{flex-direction:column;flex:1;gap:2px;display:flex}.radio-card .t b{font-size:1.02rem}.radio-card .t span{color:var(--ink-2);font-size:.88rem}.radio-card .code{background:var(--muted-fill);min-width:52px;height:36px;color:var(--ink-2);border-radius:10px;justify-content:center;align-items:center;padding:0 6px;font-size:.85rem;font-weight:800;display:flex}.radio-card.on .code{background:var(--bleu);color:#fff}.radio-card .dot{border:2px solid var(--line-2);border-radius:999px;flex:none;width:22px;height:22px}.radio-card.on .dot{border:7px solid var(--bleu);background:#fff}.goal-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;display:grid}.goal-grid button{border-radius:var(--r);border:1.5px solid var(--line);background:var(--card);min-height:68px;color:var(--ink);flex-direction:column;justify-content:center;align-items:center;display:flex}.goal-grid button b{font-size:1.25rem}.goal-grid button span{font-size:.8rem}.goal-grid button.on{border:2px solid var(--bleu);background:var(--bleu-soft);color:var(--bleu)}.check-row{cursor:pointer;align-self:flex-start;align-items:center;gap:10px;min-height:44px;font-weight:500;display:inline-flex}.check-row input{width:22px;height:22px;accent-color:var(--bleu);margin:0}.onb-actions{justify-content:space-between;gap:12px;margin-top:auto;display:flex}.set-grid{grid-template-columns:minmax(0,1fr);gap:16px;display:grid}@media (width>=1024px){.set-grid{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:20px}}.footer-note{text-align:center;color:var(--ink-3);margin-top:40px;font-size:.78rem}