:root{--red:#df252d;--green:#078652;--green2:#0aa069;--ink:#102f27;--muted:#657a72;--line:#c8dbd3;--soft:#f2f8f5;--white:#fff;--orange:#ff9f1c;--shadow:0 20px 55px rgba(8,70,49,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f9fcfa;color:var(--ink);font-family:Arial,Helvetica,sans-serif}.container{width:min(1180px,calc(100% - 40px));margin:auto}.top{position:sticky;top:0;z-index:30;background:rgba(249,252,250,.96);border-bottom:1px solid #dce8e3;backdrop-filter:blur(12px)}.top-inner{min-height:82px;display:flex;align-items:center;gap:24px}.brand{text-decoration:none;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-weight:900;font-size:27px;letter-spacing:-1.5px;white-space:nowrap}.turbo{color:var(--red)}.uroki{color:var(--green)}.nav{display:flex;gap:20px;margin-left:auto;align-items:center;flex-wrap:wrap}.nav a{text-decoration:none;color:#536960;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-weight:700;font-size:13px}.nav a:hover,.nav a.active{color:var(--green)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 16px;border:1px solid var(--green);text-decoration:none;font-weight:800;color:var(--green);background:#fff;cursor:pointer}.btn.primary{background:var(--green);color:#fff}.btn.red{background:var(--red);border-color:var(--red);color:#fff}.hero{position:relative;overflow:hidden;padding:62px 0;border-bottom:1px solid #dce8e3;background:linear-gradient(120deg,#fbfdfc,#edf8f3 58%,#e6f7ef)}.hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(12,111,75,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(12,111,75,.04) 1px,transparent 1px);background-size:32px 32px}.hero-grid{position:relative;display:grid;grid-template-columns:1.3fr .7fr;gap:42px;align-items:center}.crumbs{display:flex;gap:8px;flex-wrap:wrap;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;color:#788a83;margin-bottom:18px}.crumbs a{color:var(--green);text-decoration:none}.eyebrow{display:inline-flex;border-left:3px solid var(--green);background:#e7f6ee;padding:8px 11px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;color:#41695f;margin-bottom:18px}.hero h1{font-size:clamp(42px,6vw,70px);line-height:.98;letter-spacing:-3px;margin:0 0 18px}.hero h1 .accent{color:var(--green)}.hero p{font-size:19px;line-height:1.55;color:#536b62;max-width:760px}.hero-stats{display:flex;gap:15px;flex-wrap:wrap;margin-top:28px}.stat{min-width:135px;border:1px solid var(--line);background:#fff;padding:15px}.stat strong{display:block;font-size:27px}.stat span{font-size:12px;color:var(--muted)}.side-card{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:26px}.side-card h3{margin:0 0 10px;font-size:22px}.side-card p{color:var(--muted);line-height:1.5}.choice-grid,.task-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.section{padding:54px 0 76px}.section.soft{background:var(--soft);border-top:1px solid #e0ebe6;border-bottom:1px solid #e0ebe6}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:24px}.section h2{font-size:36px;letter-spacing:-1.4px;margin:0 0 8px}.section-head p{margin:0;color:var(--muted)}.source{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;color:var(--green);text-decoration:none}.choice{display:block;text-decoration:none;color:inherit;background:#fff;border:1px solid var(--line);padding:28px;min-height:230px;position:relative;transition:.18s}.choice:hover,.task-card:hover{transform:translateY(-3px);border-color:var(--green);box-shadow:var(--shadow)}.choice .label,.task-card .label{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.08em;font-size:11px;color:#71847c}.choice h3{font-size:30px;margin:24px 0 10px}.choice p{color:var(--muted);line-height:1.55}.choice .go{position:absolute;right:24px;bottom:22px;color:var(--green);font-weight:900}.toolbar{display:flex;gap:12px;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap}.search{flex:1;min-width:240px;padding:13px 15px;border:1px solid var(--line);background:#fff;font:inherit;outline:none}.filters{display:flex;gap:8px;flex-wrap:wrap}.filter{padding:10px 12px;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:800;cursor:pointer}.filter.active{background:var(--green);color:#fff;border-color:var(--green)}.task-grid{grid-template-columns:repeat(3,1fr)}.task-card{display:flex;flex-direction:column;text-decoration:none;color:inherit;background:#fff;border:1px solid var(--line);padding:20px;min-height:180px;transition:.18s}.task-num{display:flex;align-items:center;justify-content:space-between;gap:8px}.task-num b{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--red);font-size:17px}.badge{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:10px;border:1px solid var(--line);padding:5px 7px;color:#64776f}.badge.high{border-color:#e7b3b5;color:#a72328;background:#fff5f5}.badge.advanced{border-color:#e6d5a8;color:#8b6a13;background:#fffaf0}.task-card h3{font-size:20px;margin:18px 0 8px}.task-card p{color:var(--muted);line-height:1.45;margin:0}.task-foot{margin-top:auto;padding-top:16px;display:flex;justify-content:space-between;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;color:var(--green)}.progress{margin-top:22px}.track{height:9px;background:#e2eee8;overflow:hidden}.track>span{display:block;height:100%;background:var(--green);width:0}.progress-row{display:flex;justify-content:space-between;margin-bottom:8px;font-size:13px}.lesson-hero{padding:42px 0 34px;background:linear-gradient(135deg,#f9fcfa,#eef8f3);border-bottom:1px solid #dce8e3}.lesson-hero h1{font-size:clamp(34px,5vw,56px);letter-spacing:-2px;margin:8px 0 14px}.lesson-hero p{font-size:18px;color:var(--muted);line-height:1.55;max-width:850px}.lesson-meta{display:flex;gap:9px;flex-wrap:wrap;margin-top:16px}.pill{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;border:1px solid var(--line);background:#fff;padding:7px 9px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px;align-items:start}.content-card{background:#fff;border:1px solid var(--line);padding:26px;margin-bottom:18px}.content-card h2{font-size:28px;margin:0 0 14px}.content-card h3{font-size:20px}.content-card p,.content-card li{line-height:1.65;color:#455f56}.steps{counter-reset:steps;display:grid;gap:10px;padding:0;list-style:none}.steps li{position:relative;padding:12px 12px 12px 48px;background:#f5faf7;border-left:2px solid var(--green)}.steps li:before{counter-increment:steps;content:counter(steps);position:absolute;left:14px;top:11px;width:23px;height:23px;border-radius:50%;background:var(--green);color:#fff;display:grid;place-items:center;font-weight:900;font-size:12px}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#0f2d25;color:#eafff5;padding:16px 18px;overflow:auto;line-height:1.7}.example{border-left:4px solid var(--red);background:#fff7f7;padding:16px 18px;line-height:1.65}.practice{border:2px solid #b8d5c9;background:#f8fffb;padding:20px}.practice label{display:block;font-weight:800;margin-bottom:10px}.answer-row{display:flex;gap:10px;flex-wrap:wrap}.answer{flex:1;min-width:180px;padding:12px;border:1px solid var(--line);font-size:16px}.check{padding:12px 16px;border:0;background:var(--green);color:#fff;font-weight:900;cursor:pointer}.feedback{min-height:24px;margin-top:10px;font-weight:800}.feedback.ok{color:var(--green)}.feedback.bad{color:var(--red)}.sidebar{position:sticky;top:102px}.sidebar-card{background:#fff;border:1px solid var(--line);padding:20px;margin-bottom:14px}.sidebar-card h3{margin:0 0 12px;font-size:18px}.sidebar-card a{display:block;text-decoration:none;color:var(--green);margin:9px 0}.complete{width:100%;padding:12px;border:1px solid var(--green);background:#fff;color:var(--green);font-weight:900;cursor:pointer}.complete.done{background:var(--green);color:#fff}.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:24px}.lesson-nav a{flex:1;text-decoration:none;border:1px solid var(--line);background:#fff;padding:14px;color:var(--green);font-weight:800}.lesson-nav a:last-child{text-align:right}.footer{border-top:1px solid #dce8e3;padding:30px 0 44px;color:#657a72}.footer-inner{display:flex;justify-content:space-between;gap:20px;align-items:center}.note{border:1px solid #efc4c6;background:#fff7f7;padding:15px 17px;line-height:1.55;color:#6e5051}.empty{display:none;text-align:center;padding:35px;color:var(--muted)}
@media(max-width:900px){.hero-grid,.lesson-layout{grid-template-columns:1fr}.sidebar{position:static}.task-grid{grid-template-columns:repeat(2,1fr)}.top-inner{padding:16px 0;align-items:flex-start;flex-direction:column}.nav{margin-left:0}.choice-grid{grid-template-columns:1fr}}@media(max-width:600px){.container{width:min(100% - 24px,1180px)}.task-grid{grid-template-columns:1fr}.hero h1{font-size:42px;letter-spacing:-2px}.section h2{font-size:30px}.lesson-nav{flex-direction:column}.nav{gap:10px}.hero-stats{display:grid;grid-template-columns:1fr 1fr}.footer-inner{flex-direction:column;align-items:flex-start}}