@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#212339;--muted:#747587;--purple:#6852cc;--lav:#f0ecff;--line:#e8e7ed;--paper:#faf9f6;--green:#237f70;--orange:#c77436}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px 'DM Sans',Arial,sans-serif}button,select,input{font:inherit}button,select{cursor:pointer}button{border:1px solid var(--line);border-radius:9px;padding:10px 15px;background:white;color:var(--ink);min-height:42px;font-weight:600}button:hover{background:var(--lav);border-color:#c6bbee}button:disabled{opacity:.4;cursor:default}button:focus-visible,select:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #a391f1;outline-offset:3px}header{height:88px;display:flex;align-items:center;justify-content:space-between;padding:0 42px;border-bottom:1px solid var(--line);background:white}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font:800 24px 'Manrope',Arial}.brand small{display:block;font:600 9px 'DM Sans',Arial;letter-spacing:3.2px;margin-top:3px}.logo{display:flex;align-items:center;justify-content:center;width:42px;height:42px;background:var(--purple);border-radius:12px;color:white;font-size:28px;position:relative}.logo span{font-size:14px;position:absolute;right:4px;top:0}.header-note{font-size:13px;color:var(--muted)}.pill{border:1px solid var(--line);padding:7px 12px;border-radius:30px;font-size:12px;background:white;white-space:nowrap}.layout{max-width:1550px;display:grid;grid-template-columns:282px 1fr;margin:auto;min-height:calc(100vh - 88px)}aside{padding:34px 24px;border-right:1px solid var(--line);background:#fff}.label,.eyebrow{font-size:10px;font-weight:800;letter-spacing:1.6px;color:var(--purple)}aside label{display:block;font-size:12px;margin:21px 0 8px;font-weight:600}select{border:1px solid var(--line);border-radius:8px;background:white;color:var(--ink);padding:10px;width:100%;font-size:13px}aside select{text-overflow:ellipsis}.catalog-note{font-size:12px;line-height:1.8;margin-top:16px;color:var(--muted)}.catalog-note span{font-size:11px}.module-tag{margin-top:35px;padding-top:25px;border-top:1px solid var(--line);font-size:10px;font-weight:700;letter-spacing:2px;color:var(--muted)}aside h2{font:700 19px/1.4 'Manrope',Arial;margin:10px 0 20px}nav{display:grid;gap:8px}nav button{display:flex;text-align:left;align-items:flex-start;gap:10px;border:0;background:transparent;padding:13px 10px;line-height:1.4;font-size:12px}nav button.active{background:var(--lav);color:var(--purple)}nav .num{padding-top:1px;font-size:11px;color:var(--muted)}nav button.active .num{color:var(--purple)}.sidebar-bottom{margin-top:38px;display:flex;gap:12px;font-size:11px;color:var(--muted);line-height:1.7}.sidebar-bottom strong{font-weight:500}.little-icon{color:var(--purple);font-size:22px;padding-top:10px}main{padding:30px 45px;min-width:0}.breadcrumb{font-size:11px;color:var(--muted)}.breadcrumb span{margin:0 10px}.intro{display:flex;align-items:center;justify-content:space-between;padding:32px 0 27px;gap:20px}h1{font:800 clamp(28px,3.2vw,43px)/1.2 'Manrope',Arial;letter-spacing:-1.5px;margin:12px 0 16px}h1 em{font-style:normal;color:var(--purple)}.intro p{max-width:470px;line-height:1.7;color:var(--muted);font-size:13px}.hero-art{width:180px;height:150px;position:relative;flex-shrink:0}.hero-art .fraction{position:absolute;font:500 65px Georgia;left:64px;top:30px;background:#ebe5ff;width:92px;height:92px;border-radius:25px;text-align:center;transform:rotate(-12deg);color:var(--purple)}.orbit{position:absolute;left:16px;top:10px;color:var(--green);font-size:36px;transform:rotate(12deg)}.times{position:absolute;right:0;bottom:0;font-size:32px;color:var(--orange)}.art-line{position:absolute;bottom:0;left:5px;right:15px;border-bottom:1px solid #b9accf;transform:rotate(-15deg)}.art-dot{position:absolute;left:30px;bottom:7px;width:10px;height:10px;border-radius:50%;background:var(--purple)}.lesson-head{display:flex;align-items:center;justify-content:space-between;margin:5px 0 16px;gap:12px}.lesson-head h2{font:700 21px/1.35 'Manrope',Arial;margin:6px 0}.subtle{background:transparent;color:var(--muted)}.player{background:white;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 8px 30px #23223c04}.player-top{display:flex;align-items:center;gap:9px;padding:17px 22px;border-bottom:1px solid var(--line);font-size:12px;font-weight:600}.live-dot{height:7px;width:7px;border-radius:50%;background:var(--purple)}#step-count{margin-left:auto;font-variant-numeric:tabular-nums;color:var(--muted)}#scene{min-height:255px;padding:6px 16px;background:radial-gradient(#dcd8e6 .65px,transparent .65px);background-size:18px 18px}#scene svg{display:block;width:100%;height:auto;max-height:330px;overflow:visible}#scene svg text{font-family:'DM Sans',Arial,sans-serif;fill:var(--ink)}.caption{display:flex;gap:14px;background:#f6f4fd;margin:4px 22px 18px;padding:17px;border-radius:10px;min-height:100px}#caption-number{background:white;border:1px solid #e4def7;border-radius:7px;width:28px;height:28px;flex-shrink:0;display:grid;place-items:center;color:var(--purple);font-size:12px}.caption strong{font-size:13px}.caption p{margin:6px 0 0;font-size:13px;line-height:1.65;color:#636078}.transport{display:flex;gap:8px;padding:0 22px 10px;align-items:center;flex-wrap:wrap}.primary{background:var(--purple);color:white;border-color:var(--purple)}.primary:hover{background:#5541b0;color:white}.speed{margin-left:auto;display:flex;align-items:center;gap:8px;font-size:11px;color:var(--muted)}.speed select{width:85px}.timeline-label{display:flex;align-items:center;gap:10px;padding:4px 24px 20px;font-size:11px;color:var(--muted)}input[type=range]{width:100%;accent-color:var(--purple)}.under{display:flex;justify-content:space-between;gap:24px;align-items:center;margin:28px 0}.under h3{font:700 16px 'Manrope',Arial;margin:8px 0}.under p{font-size:12px;color:var(--muted);line-height:1.7;max-width:530px}.outline{white-space:nowrap;background:transparent;color:var(--purple);border-color:#d4cbee;font-size:12px}footer{border-top:1px solid var(--line);padding:22px 0 4px;font-size:11px;color:var(--muted);display:flex;justify-content:space-between}#activity-tools{padding:12px 22px 0;display:flex;gap:8px;flex-wrap:wrap}#activity-tools:empty{display:none}#activity-tools button{font-size:12px;padding:6px 12px;min-height:35px}#activity-tools button.selected{background:var(--lav);border-color:#c7b9ed;color:var(--purple)}.quiz{margin-top:20px;background:white;border:1px solid var(--line);border-radius:14px;padding:24px}.quiz h3{font:700 19px 'Manrope',Arial}.choices{display:grid;grid-template-columns:1fr 1fr;gap:10px}.choice{text-align:left}.choice.selected{border-color:var(--purple);background:var(--lav)}.feedback{line-height:1.7;margin:16px 0;font-size:14px}.feedback.good{color:var(--green)}.feedback.bad{color:#9e4c2a}.quiz-controls{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.quiz small{color:var(--muted)}#empty{padding:70px 0;max-width:650px}#empty p{line-height:1.8;color:var(--muted)}[hidden]{display:none!important}#completion{font-size:13px;color:var(--green);margin-bottom:12px}table{border-collapse:collapse;width:100%;font-size:13px}td,th{text-align:left;padding:10px 6px;border-bottom:1px solid var(--line)}@media(min-width:1500px){main{padding:32px 60px}}@media(max-width:1050px){.layout{grid-template-columns:235px 1fr}main{padding:25px}aside{padding:28px 16px}.hero-art{display:none}.header-note{display:none}.lesson-head .pill{display:none}}@media(max-width:720px){header{height:72px;padding:0 18px}.brand{font-size:20px}.pill{font-size:10px}.layout{display:block}aside{padding:18px;border-right:0;border-bottom:1px solid var(--line)}aside .label,.catalog-note,.module-tag,aside h2,.sidebar-bottom{display:none}aside label{margin:10px 0 5px}#topics{display:grid;grid-template-columns:1fr 1fr;margin-top:16px;gap:4px}nav button{font-size:11px;padding:10px 6px}main{padding:22px 16px}.intro{padding:22px 0 10px}h1{font-size:30px}.lesson-head h2{font-size:18px}.player-top{padding:14px}.caption{margin:6px 12px 15px;padding:12px}.transport{padding:0 12px 12px}.speed{margin-left:0}#scene{min-height:190px;padding:8px}#scene svg{min-height:195px}.under{align-items:flex-start;flex-direction:column;gap:10px}footer span{display:none}.quiz{padding:16px}.choices{grid-template-columns:1fr 1fr}}

.vocabulary{margin-top:24px;padding:20px 0;border-bottom:1px solid var(--line)}.vocab-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 22px}.vocab-grid p{font-size:13px;margin:10px 0}.vocab-grid span{display:block;font-size:12px;color:var(--muted);line-height:1.6;margin-top:4px}.vocabulary small{color:var(--muted);font-size:11px}