:root{color-scheme:light;--bg: #f7f8fb;--surface: #ffffff;--surface-soft: #f1f4f8;--text: #172033;--muted: #667085;--line: #d9e0ea;--brand: #1463ff;--brand-soft: #eaf1ff;--green: #0f8a5f;--orange: #b15c00;--shadow: 0 12px 40px rgba(23, 32, 51, .08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:16px;line-height:1.65}a{color:inherit;text-decoration:none}button,input{font:inherit}.shell{min-height:100vh}.site-header{position:sticky;top:0;z-index:20;border-bottom:1px solid var(--line);background:#fffffff5;backdrop-filter:blur(12px)}.site-header__inner{display:grid;grid-template-columns:180px minmax(260px,1fr) auto;align-items:center;gap:20px;max-width:1480px;margin:0 auto;padding:14px 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#1f231d24}.top-tab--active:hover{background:var(--text);color:#fffefa}.app-frame{max-width:1440px}.app-frame--lesson{grid-template-columns:320px minmax(0,1fr) 200px;gap:24px;align-items:start}.sidebar{top:106px;height:auto;max-height:none;align-self:start;overflow:visible;border-color:var(--line);background:linear-gradient(180deg,#fffefaf0,#f6f1e7e0),var(--surface);box-shadow:var(--shadow);padding:10px}.sidebar__head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px;padding:2px 2px 8px;border-bottom:1px solid var(--line)}.sidebar__head span{border:1px solid var(--line);border-radius:999px;color:var(--muted);padding:2px 8px;font-size:12px;font-weight:700}.sidebar__title{margin:0;color:var(--text);font-size:17px;font-weight:850;letter-spacing:0}.nav-group summary{padding:9px 8px;font-size:15px}.nav-group summary:hover,.nav-group a:hover{background:var(--surface-soft)}.nav-group a{padding:6px 8px}.sidebar__nav{display:grid;gap:2px}.sidebar 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