@font-face{font-family:Piazzolla;src:url(/fonts/piazzolla-cyrillic.woff2) format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:Golos;src:url('/fonts/golos-cyrillic.woff2') format('woff2');font-weight:100 900;font-display:swap}@font-face{font-family:Golos;src:url('/fonts/golos-latin.woff2') format('woff2');font-weight:100 900;font-display:swap;unicode-range:U+0000-024F}
:root{--ink:#272722;--muted:#686961;--paper:#f8f7f3;--accent:#b9432f;--line:#deded5}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 Golos,Arial,sans-serif}a{color:inherit;text-underline-offset:4px}button,input{font:inherit}button,.button{border:1px solid var(--accent);background:var(--accent);color:white;border-radius:6px;padding:10px 18px;cursor:pointer;text-decoration:none;display:inline-block;font-weight:550}button:hover,.button:hover{filter:brightness(.92)}button:disabled{cursor:wait;opacity:.65}.quiet{background:transparent;color:var(--ink);border-color:var(--line)}:focus-visible{outline:3px solid var(--accent);outline-offset:4px}header,footer{display:flex;align-items:center;gap:24px;padding:22px 5vw;border-bottom:1px solid var(--line)}.brand{font-size:27px;font-weight:650;letter-spacing:-1.3px;text-decoration:none}.brand span{color:var(--accent)}.header-label{font-size:13px;color:var(--muted);flex:1}header button{font-size:14px}main{max-width:1380px;margin:auto;padding:0 5vw 80px}.intro{padding:66px 0 40px;max-width:720px}.eyebrow{text-transform:uppercase;letter-spacing:.15em;font-size:11px;font-weight:600;color:var(--muted)}h1{font-family:Piazzolla,Georgia,serif;font-weight:400;font-size:clamp(42px,5vw,68px);line-height:1.08;letter-spacing:-2px;margin:20px 0}h1 em{font-style:normal;color:var(--accent)}h2{font-size:28px;line-height:1.3;letter-spacing:-.7px}h3{font-size:21px;line-height:1.4}p{margin:12px 0 22px}.intro p{max-width:580px;font-size:18px;color:var(--muted)}.catalog{display:grid;grid-template-columns:1fr 1fr;gap:24px}.set-card{background:white;border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:4px;padding:32px;display:flex;flex-direction:column}.set-card h2{max-width:480px}.set-card p{color:var(--muted)}.set-card .actions{margin-top:auto}.tag{font-size:12px;color:var(--accent);text-transform:uppercase;letter-spacing:.08em}.actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.muted{color:var(--muted);font-size:14px}.price{font-size:26px;font-weight:600;margin:12px 0}.price span{font-size:13px;color:var(--muted);font-weight:400}.availability{font-size:14px;border-left:2px solid var(--accent);padding-left:12px;margin:16px 0 24px}#workspace{display:grid;grid-template-columns:260px minmax(0,1fr);gap:38px;margin-top:45px;align-items:start}#workspace[hidden],[hidden]{display:none!important}aside{position:sticky;top:20px;font-size:13px}aside h2{font-size:20px}aside nav{display:grid;gap:5px}aside button{background:none;color:var(--ink);text-align:left;border:1px solid transparent;font-size:13px;padding:12px}aside button[aria-current=true]{border-color:var(--line);background:white;color:var(--accent)}aside .locked{color:var(--muted)}aside a{display:block;margin:10px 0}article{min-width:0;background:white;border:1px solid var(--line);padding:clamp(20px,4vw,48px);border-radius:4px}article h2:first-child{margin-top:0}article pre{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--paper);padding:20px;border-left:3px solid var(--accent);font:14px/1.7 Golos,Arial,sans-serif}article blockquote{margin:22px 0;padding:10px 24px;border-left:3px solid var(--accent);background:var(--paper)}article table{width:100%;border-collapse:collapse;font-size:13px;display:block;overflow-x:auto}td,th{border:1px solid var(--line);padding:10px;text-align:left;vertical-align:top}.lesson-section{margin-top:35px;padding-top:25px;border-top:1px solid var(--line)}summary{cursor:pointer;font-weight:600;padding:12px 0}details{border-top:1px solid var(--line);margin:28px 0}fieldset{border:1px solid var(--line);border-radius:4px;margin:22px 0;padding:18px}legend{font-weight:600;font-size:15px;padding:0 6px}.choice{display:flex;gap:10px;align-items:baseline;padding:8px 0;font-size:15px}.choice input{accent-color:var(--accent)}.answer{padding:15px;margin:12px 0;background:var(--paper);border-left:3px solid var(--accent)}.answer.good{border-color:#497355}.complete{margin-top:28px}.complete label{display:flex;gap:10px;align-items:baseline}footer{border-top:1px solid var(--line);border-bottom:0;font-size:12px;color:var(--muted)}footer span{flex:1}#notice{position:sticky;top:0;z-index:5;background:#fff3e4;box-shadow:0 2px 8px #0001;padding:12px 5vw;display:none}#notice.active{display:block}.auth-box{max-width:520px;margin:30px auto;background:white;padding:30px;border:1px solid var(--line)}.auth-box label{display:block}.auth-box input{width:100%;padding:10px;border:1px solid var(--line);margin:6px 0 16px}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:5px;z-index:20;background:white;padding:10px}.progress{height:4px;background:#eee;margin:16px 0}.progress span{height:100%;background:var(--accent);display:block}
@media(max-width:850px){#workspace{grid-template-columns:1fr}aside{position:static}aside nav{grid-template-columns:1fr 1fr}.catalog{grid-template-columns:1fr}.intro{padding-top:40px}article{padding:25px}}@media(max-width:500px){.header-label{display:none}header .brand{flex:1}header,footer{padding:18px 5vw}h1{letter-spacing:-1px}.set-card{padding:24px}aside nav{grid-template-columns:1fr}footer{flex-wrap:wrap}footer span{display:none}article{padding:20px}h2{font-size:24px}.actions button{width:100%}}@media print{header,footer,aside,.catalog,.intro,#auth,#notice,button,.complete{display:none!important}main{padding:0}#workspace{display:block;margin:0}article{border:0;padding:0}details{display:block}details>*{display:block}h2,h3{break-after:avoid}pre,fieldset{break-inside:avoid}}