:root{--slate:#3c454c;--dark:#293137;--orange:#f7a21b;--lavender:#ece6f2;--ink:#20272b;--muted:#626b73;--line:#dfe3e6;--paper:#f6f7f8;--radius:8px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:white;font:16px/1.65 "Open Sans",Arial,sans-serif}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button{cursor:pointer}img{max-width:100%;display:block}h1,h2,h3,p{margin:0 0 16px}h1,h2,h3{line-height:1.18;color:var(--slate);letter-spacing:-.025em}h1{font-size:clamp(32px,4.5vw,60px);font-weight:750}h2{font-size:28px}h3{font-size:22px}small,.muted{color:var(--muted)}small{font-size:13px}hr{border:0;border-top:1px solid var(--line);margin:28px 0}button:disabled{opacity:.35;cursor:default}:focus-visible{outline:3px solid var(--orange);outline-offset:4px}.wrap{width:min(1240px,calc(100% - 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form>.button{margin-top:16px}.two-fields{display:grid;grid-template-columns:1fr 1fr;gap:20px}.checkbox{display:flex;align-items:center;gap:10px;margin-bottom:6px}.checkbox input{margin:0}.cover-preview{max-height:120px;max-width:200px;margin-bottom:20px}.admin-lesson{display:flex;gap:15px;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding:17px 0}.admin-lesson small{display:block;font-size:11px}.admin-lesson a{font-size:14px}.sort-actions{display:flex;gap:6px}.sort-actions button{width:30px;height:32px;border:1px solid var(--line);background:var(--paper);border-radius:3px}.lesson-editor{max-width:850px}.auth-card{max-width:500px;margin:65px auto;padding:40px;background:white;border:1px solid var(--line);border-radius:var(--radius)}.auth-card h1{font-size:36px}.auth-card p{color:var(--muted)}.auth-card .button{margin-top:24px;width:100%}.notice,.error{margin:25px 0;padding:15px 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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}