@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#183c31;--muted:#6a766e;--paper:#f7f8f2;--line:#dce2d7;--lime:#d1ec9b;--green:#234c3e}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px 'DM Sans',Segoe UI,sans-serif}button,a,input{touch-action:manipulation}button{font:inherit;cursor:pointer}button:disabled{cursor:default;opacity:.55}a{color:inherit}header{height:88px;display:flex;align-items:center;gap:24px;padding:0 40px;border-bottom:1px solid var(--line);background:#fff}.brand{font-weight:700;text-decoration:none;font-size:20px;display:flex;align-items:center;gap:12px}.mark{width:36px;height:36px;background:var(--ink);color:var(--lime);border-radius:50%;text-align:center;font-size:28px}.edition{font-size:10px;letter-spacing:2px;margin-left:auto}.quiet{border:1px solid var(--line);background:transparent;border-radius:8px;padding:10px 16px;color:var(--ink)}header .quiet{font-size:12px}.layout{display:grid;grid-template-columns:310px minmax(0,1fr);max-width:1600px;margin:auto}aside{padding:36px 25px;border-right:1px solid var(--line)}.eyebrow{font-size:10px;font-weight:800;letter-spacing:2px;color:#64806a}h2{font:700 27px/1.25 'Manrope',Segoe UI,sans-serif;letter-spacing:-1px;margin:15px 0}p{line-height:1.6}.muted{color:var(--muted);font-size:13px}.progress-label{display:flex;justify-content:space-between;font-size:11px;margin-top:28px}progress{width:100%;height:5px;border:0;background:var(--line);margin:10px 0 26px;border-radius:8px}progress::-webkit-progress-bar{background:var(--line);border-radius:8px}progress::-webkit-progress-value{background:var(--green);border-radius:8px}nav{display:grid;gap:7px}.lesson-link{display:flex;gap:13px;align-items:center;text-align:left;background:none;border:1px solid transparent;border-radius:10px;padding:12px 10px;color:var(--ink);width:100%}.lesson-link.active{background:#e6edda;border-color:#d5dfc7}.lesson-link:hover{background:#edf0e6}.num{min-width:29px;height:29px;border:1px solid #c7d0c3;border-radius:50%;display:grid;place-items:center;font-size:11px}.lesson-link.active .num,.lesson-link.done .num{background:var(--ink);color:white;border-color:var(--ink)}.lesson-link strong{font-size:12px;line-height:1.4;display:block}.lesson-link small{display:block;margin-top:5px;font-size:10px;color:var(--muted)}.exam-nav{margin-top:24px;width:100%;background:var(--ink);color:white;border:0;border-radius:10px;padding:17px;text-align:left;font-size:12px}.exam-nav span{display:block;color:#afc6b9;font-size:10px;margin:8px 0 0 24px}.source-link{display:block;font-size:11px;margin:27px 5px}.storage-note{font-size:10px;color:var(--muted);padding:0 5px}main{padding:38px 46px;min-width:0}.lesson-top{display:flex;justify-content:space-between;align-items:center}.pill{border:1px solid var(--line);border-radius:30px;padding:6px 12px;font-size:11px}h1{font:700 clamp(28px,3.4vw,47px)/1.15 'Manrope',Segoe UI,sans-serif;letter-spacing:-1.7px;margin:18px 0 13px}.objective{font-size:14px;color:var(--muted);margin-bottom:27px;max-width:760px}.video-shell{background:#102923;border-radius:14px;overflow:hidden;box-shadow:0 12px 30px #163a3010}video{display:block;width:100%;aspect-ratio:16/9;background:#102923}.video-meta{display:flex;justify-content:space-between;gap:10px;font-size:10px;color:var(--muted);margin:12px 2px 20px}.chapters{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.chapters button{border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--ink);text-align:left;padding:12px;font-size:11px;line-height:1.5}.chapters button span{display:block;font-size:10px;color:var(--muted);margin-bottom:5px}.chapters button.active{background:#e9eedf;border-color:#9bae8f}.under-video{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:32px}.tabs{display:flex;gap:19px;border-bottom:1px solid var(--line)}.tabs button{border:0;background:transparent;padding:0 0 12px;color:var(--muted);font-size:12px}.tabs button[aria-selected=true]{color:var(--ink);border-bottom:2px solid var(--ink);font-weight:700}.resource{font-size:13px;line-height:1.7;padding-top:14px}.resource h4{margin:13px 0 6px}.resource ul{padding-left:20px}.resource .reference{font-size:11px;color:var(--muted);margin-top:20px}.check{background:#fff;border:1px solid var(--line);border-radius:12px;padding:23px}h3{font-size:16px;line-height:1.5;margin:12px 0 17px}.answer{display:block;text-align:left;width:100%;background:#fff;border:1px solid var(--line);padding:11px 13px;border-radius:7px;margin:8px 0;color:var(--ink);font-size:12px;line-height:1.5}.answer:hover{background:#f4f7ed}.answer.correct{border-color:#377248;background:#eaf4e2}.answer.wrong{border-color:#a15643;background:#fff0e9}.feedback{font-size:12px}.primary{background:var(--ink);color:white;border:0;border-radius:8px;padding:13px 19px;font-weight:600;font-size:12px}.check .primary{width:100%;margin-top:4px}.small{font-size:10px;color:var(--muted);margin-bottom:0}.bottom-nav{display:flex;justify-content:space-between;margin-top:30px}footer{border-top:1px solid var(--line);margin-top:42px;padding-top:22px;font-size:10px;color:var(--muted)}footer strong{font-size:12px;color:var(--ink)}.exam-card{padding:24px;border:1px solid var(--line);background:white;border-radius:12px;margin:16px 0}.exam-card legend{font-weight:600;font-size:15px;padding:0 6px}.exam-card label{display:block;padding:10px;font-size:13px;line-height:1.5}.exam-card input{margin-right:10px}.explanation{font-size:13px;background:#edf2e5;padding:14px;border-radius:8px}#examResult{font-size:18px;font-weight:600}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #839e42;outline-offset:4px}[hidden]{display:none!important}@media(min-width:1500px){main{padding:45px 64px}}@media(max-width:1000px){.layout{grid-template-columns:250px minmax(0,1fr)}aside{padding:30px 16px}main{padding:30px 26px}.under-video{grid-template-columns:1fr}.edition{display:none}}@media(max-width:680px){header{padding:0 18px;height:72px}.brand{font-size:15px}.mark{width:30px;height:30px;font-size:23px}header .quiet{margin-left:auto;padding:8px;font-size:10px}.layout{display:block}aside{border-right:0;border-bottom:1px solid var(--line);padding:23px 20px}aside h2,aside .muted,.storage-note,.source-link{display:none}.progress-label{margin-top:15px}progress{margin-bottom:13px}nav{display:flex;overflow:auto;padding-bottom:5px}.lesson-link{min-width:190px;max-width:190px}.exam-nav{margin-top:10px}.exam-nav span{display:inline;margin-left:12px}main{padding:24px 20px}.chapters{gap:5px}.chapters button{padding:9px;font-size:10px}.video-meta{font-size:9px}.under-video{gap:24px}.tabs{gap:24px}h1{letter-spacing:-1px}footer{margin-top:28px}}