:root{--red:#e52b2f;--green:#0aa968;--ink:#17211d;--muted:#66736d;--line:#e2e9e5;--soft:#f6faf8;--white:#fff;--amber:#d98709;--violet:#7157c8}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.55}.container{width:min(1180px,calc(100% - 40px));margin:auto}.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.top-inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-weight:900;font-size:25px;letter-spacing:-1px;text-decoration:none;white-space:nowrap}.turbo{color:var(--red)}.uroki{color:var(--green)}.nav{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.nav a{padding:9px 12px;border-radius:12px;text-decoration:none;color:#44514b;font-weight:700;font-size:14px}.nav a:hover,.nav 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#cce8d9;background:#f3fbf7;border-radius:16px;color:#315946}.footer{border-top:1px solid var(--line);padding:28px 0;background:#fbfcfb}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;color:#738079;font-size:13px}.lesson-wrap{padding:30px 0 70px}.lesson-grid{display:grid;grid-template-columns:minmax(0,820px);justify-content:center}.lesson-main{min-width:0}.lesson-head{padding:28px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(135deg,#fff,#f5fbf8);margin-bottom:16px}.lesson-kicker{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.lesson-head h1{font-size:clamp(30px,5vw,48px);line-height:1.08;letter-spacing:-1.8px;margin:18px 0 10px}.lesson-head p{font-size:17px;color:#617069;margin:0}.section-card{border:1px solid var(--line);border-radius:20px;padding:25px;margin:16px 0;background:#fff}.section-card h2{font-size:24px;margin:0 0 13px;letter-spacing:-.5px}.section-card 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