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.thumb{background:var(--line);object-fit:cover;border-radius:10px;flex:none;width:64px;height:46px}.file-row .grow{flex:1;min-width:0}.file-row strong{text-overflow:ellipsis;white-space:nowrap;font-size:.9rem;display:block;overflow:hidden}.upload-drop{border:1.5px dashed var(--line);min-height:72px;color:var(--blue);cursor:pointer;border-radius:16px;justify-content:center;align-items:center;gap:10px;font-weight:600;display:flex}.check-row{cursor:pointer;align-items:center;gap:12px;min-height:44px;font-weight:400;display:flex}.check-row input{width:22px;height:22px;accent-color:var(--blue)}.steps-ready{flex-direction:column;gap:12px;display:flex}.steps-ready li{align-items:center;gap:12px;font-size:.9rem;display:flex}.steps-ready .state-dot.done{background:var(--light-blue)}.steps-ready .state-dot.open{color:var(--white);background:#2a2a33;border:0}@media (width>=1024px){.task-layout{grid-template-columns:minmax(0,1fr) 270px;align-items:start;gap:32px;display:grid}.task-layout aside{position:sticky;top:100px}}.quiz-progress{gap:6px;display:flex}.quiz-progress span{background:var(--soft);border-radius:999px;flex:1;height:6px}.quiz-progress span.on{background:var(--ink)}.option{border:1.5px solid var(--line);background:var(--white);width:100%;min-height:60px;color:var(--ink);font:inherit;text-align:left;cursor:pointer;border-radius:18px;align-items:center;gap:14px;padding:12px 16px;display:flex}.option .letter{background:var(--mist);border-radius:999px;flex:none;justify-content:center;align-items:center;width:32px;height:32px;font-size:.85rem;font-weight:600;display:inline-flex}.option[aria-checked=true]{border-color:var(--blue)}.option[aria-checked=true] .letter{background:var(--blue);color:var(--white)}.resource-grid{gap:16px;display:grid}@media (width>=720px){.resource-grid{grid-template-columns:repeat(2,1fr)}}@media (width>=1280px){.resource-grid{grid-template-columns:repeat(3,1fr)}}.icon-bubble{background:var(--mist);width:44px;height:44px;color:var(--blue);border-radius:999px;flex:none;justify-content:center;align-items:center;display:inline-flex}.bonus-grid{gap:16px;display:grid}@media (width>=720px){.bonus-grid{grid-template-columns:1fr 1fr}}.bonus-card{color:var(--ink);padding:0;text-decoration:none;overflow:hidden}.bonus-card .thumb{aspect-ratio:16/7;background:var(--ink);color:var(--light-blue);justify-content:center;align-items:center;display:flex}.bonus-card .body{flex-direction:column;gap:6px;padding:18px 22px 22px;display:flex}.bonus-card .body h3{font-size:1.05rem;font-weight:600}.bonus-card.locked .thumb{background:var(--soft);color:var(--muted)}.auth{background:var(--white);min-height:100dvh;display:grid}.auth-form{width:100%;max-width:420px;padding:max(20px, env(safe-area-inset-top)) 20px 40px;flex-direction:column;gap:18px;margin:0 auto;display:flex}.auth-form form{flex-direction:column;gap:18px;display:flex}.auth-art{display:none}@media (width>=1024px){.auth{grid-template-columns:1fr 1.15fr}.auth-form{max-width:548px;margin:0;padding:56px 64px}.auth-art{background:var(--ink);color:var(--white);flex-direction:column;justify-content:center;gap:24px;padding:56px;display:flex}}.landing{background:var(--white);min-height:100dvh}.landing header{justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;padding:20px;display:flex}.landing .hero{flex-direction:column;gap:20px;max-width:1200px;margin:0 auto;padding:32px 20px 64px;display:flex}.landing .hero h1{max-width:14ch;font-size:clamp(2.4rem,9vw,4.5rem)}.landing .hero p{color:var(--muted);max-width:36rem;font-size:1.1rem}.desktop-only{display:none}@media (width>=1024px){.desktop-only{display:block}.mobile-only-actions .lesson-actionbar:not(:has(.button[href])){display:none}}.lesson-top .title-short{text-align:center;flex:1;font-size:.9rem;font-weight:600}.lesson-top .title,.lesson-top .of,.back-chip .label{display:none}.back-chip{justify-content:center;width:44px;padding:0}.lesson-main>.player:first-child{margin-top:-24px}.continue-button{width:100%}@media (width>=1024px){.lesson-top .title,.lesson-top .of{display:block}.lesson-top .title-short{display:none}.back-chip{width:auto;padding:0 16px 0 12px}.back-chip .label{display:inline}.lesson-main>.player:first-child{margin-top:0}.lesson-actionbar .button.full{width:auto;min-width:200px}.continue-button{width:auto;min-width:150px}}