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.lesson-page{background:#fafbf8}.lesson-head{padding-top:65px;padding-bottom:65px}.back-link{display:block;color:var(--muted);font-size:12px;font-weight:700;margin-bottom:64px}.back-link:hover{color:var(--blue)}.lesson-head h1{max-width:850px;margin:25px 0 17px}.lesson-head>p{font-size:19px;color:#576763;line-height:1.6;max-width:720px}.lesson-meta{display:flex;gap:34px;border-top:1px solid var(--line);padding-top:23px;margin-top:45px;font-size:11px;color:#6a7972;font-weight:750}.lesson-body{display:grid;grid-template-columns:210px minmax(0,1fr);gap:90px;padding-bottom:130px}.lesson-aside{position:sticky;top:30px;align-self:start;display:flex;flex-direction:column;gap:16px;font-size:12px}.lesson-aside span{font-size:10px;font-weight:800;letter-spacing:.13em;color:#92a099;margin-bottom:8px}.lesson-aside a{color:#6c7b73}.lesson-aside a:hover{color:var(--blue)}.lesson-article{max-width:760px}.lesson-article p,.lesson-article li{font-size:16px;line-height:1.86;color:#384744}.lesson-article .article-lead{font-size:20px;line-height:1.7;color:#273632;margin-top:0}.lesson-article h2{font-size:34px;line-height:1.2;letter-spacing:-.055em;margin:58px 0 18px;scroll-margin-top:30px}.lesson-article strong{color:#162b25}.formula-box{background:#eaf2ea;border:1px solid #d4e3d6;padding:26px;border-radius:10px;margin:40px 0}.formula-box>span{display:block;color:var(--blue);font-size:10px;font-weight:800;letter-spacing:.14em;margin-bottom:18px}.formula-box>div{display:flex;justify-content:space-between;gap:15px;border-top:1px solid #ccddcf;padding:11px 0;font-size:13px}.formula-box>div:last-child{padding-bottom:0}.formula-box code{font:500 12px ui-monospace,SFMono-Regular,Consolas,monospace;color:#47624f;text-align:right}.exercise{background:white;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:7px;padding:23px 27px}.exercise p{margin:0 0 15px}.exercise details{border-top:1px solid var(--line);padding-top:13px}.exercise summary{font-size:13px;color:var(--blue);font-weight:800;cursor:pointer}.exercise details p{font-size:14px;margin:13px 0 0}.lesson-end{border-top:1px solid var(--line);margin-top:70px;padding-top:25px;display:flex;align-items:center;justify-content:space-between;gap:20px;color:#7f8a82;font-size:12px}.document{padding-block:80px 130px}.document-head{border-bottom:1px solid var(--line);padding-bottom:55px}.document-head h1{margin-bottom:20px}.document-head>p{max-width:650px;font-size:17px;line-height:1.6;color:var(--muted)}.document-body{display:grid;grid-template-columns:225px minmax(0,720px);gap:100px;padding-top:55px}.document-body aside{display:flex;flex-direction:column;gap:18px;font-size:12px;color:#73817a;position:sticky;top:30px;align-self:start}.document-body aside a:hover{color:var(--blue)}.document-body article section{scroll-margin-top:30px;margin-bottom:49px}.document-body h2{font-size:28px;letter-spacing:-.05em;margin:0 0 15px}.document-body p{font-size:15px;line-height:1.85;color:#4e5d56}.document-body p a{color:var(--blue);text-decoration:underline}.not-found{padding-block:150px;min-height:520px}.not-found p{color:var(--muted);margin-bottom:25px}
@media(max-width:980px){.hero{grid-template-columns:1fr;gap:45px;padding-block:70px}.hero h1{font-size:clamp(48px,7vw,72px)}.hero-visual{min-height:390px}.metric-main{margin-top:35px}.section{padding-block:80px}.account-promo{gap:40px}.auth-wrap{gap:45px;grid-template-columns:1fr 430px}.lesson-body{gap:40px}.document-body{gap:45px}}@media(max-width:760px){.shell{width:min(100% - 36px,580px)}.site-header{height:auto;min-height:74px}.header-inner{flex-wrap:wrap;padding-block:15px}.brand{min-width:0}.brand-text small{display:none}.main-nav{width:100%;gap:20px;justify-content:space-between;overflow-x:auto;padding:10px 0 0;white-space:nowrap;font-size:11px}.main-nav .nav-account{border:0;padding:0;gap:4px}.hero{padding-block:64px 70px;min-height:0}.hero h1{font-size:clamp(40px,9vw,64px);white-space:normal;margin-block:20px}.hero-lead{font-size:16px}.button-row{flex-direction:column;align-items:stretch}.hero-visual{min-height:390px;padding:24px}.metric-main strong{font-size:90px}.metric-main strong span{font-size:36px;vertical-align:18px}.band-inner{display:block;padding-block:26px;min-height:0}.band-inner p{font-size:21px;margin:14px 0 0}.section{padding-block:70px}.section-heading{display:block;margin-bottom:30px}.section-heading h2,.account-promo h2,.faq-grid h2,.contact-section h2{font-size:40px}.section-heading>p{margin-top:20px}.two-cards,.program-grid,.lesson-card,.account-promo,.faq-grid,.contact-section,.footer-grid,.auth-wrap,.dashboard-grid,.lesson-body,.document-body{grid-template-columns:1fr}.program-item{min-height:0;padding:26px}.program-item h3{margin-top:18px}.lesson-card>div:first-child{padding:27px}.lesson-diagram{padding:15px 25px}.lesson-diagram div{padding:8px 0}.lesson-diagram strong{font-size:22px}.account-promo{gap:50px}.promo-panel{transform:none}.faq-grid,.contact-section{gap:32px}.footer-grid{gap:35px;padding-bottom:40px}.site-footer{padding-top:45px}.footer-bottom{gap:12px;flex-wrap:wrap}.auth-wrap{padding-block:50px 85px;gap:35px;min-height:0}.auth-intro{padding:0}.auth-intro h1,.dashboard h1,.document h1,.lesson-head h1,.not-found h1{font-size:47px}.auth-side-note{margin-top:30px}.auth-card{padding:25px}.dashboard{padding-block:55px 85px}.dashboard-heading{display:block}.verified-badge{display:inline-block;margin-top:10px}.materials-panel{grid-column:auto}.panel{padding:24px}.future-list div{grid-template-columns:47px 1fr;gap:7px}.future-list em{grid-column:2;justify-self:start}.lesson-head{padding-top:42px;padding-bottom:30px}.back-link{margin-bottom:46px}.lesson-head>p{font-size:16px}.lesson-meta{flex-wrap:wrap;gap:13px}.lesson-aside{position:static;flex-direction:row;flex-wrap:wrap;gap:10px 15px;margin-bottom:25px}.lesson-aside span{width:100%}.lesson-article h2{font-size:29px;margin-top:45px}.lesson-article p{font-size:15px}.lesson-article .article-lead{font-size:18px}.lesson-body{gap:10px;padding-bottom:80px}.formula-box>div{flex-direction:column;gap:3px}.formula-box code{text-align:left}.document{padding-block:52px 90px}.document-head{padding-bottom:35px}.document-body{padding-top:30px;gap:32px}.document-body aside{position:static;flex-direction:row;flex-wrap:wrap;gap:10px 18px}.document-body article section{margin-bottom:35px}}@media(max-width:380px){.main-nav{gap:12px}.main-nav a{font-size:10px}.hero h1{font-size:39px}.button{padding:15px}.visual-line>span{font-size:18px}.auth-card .otp-input{letter-spacing:.35em}}
.notice{background:#fff4e9;border:1px solid #efd8c2;color:#7c542e;border-radius:7px;padding:12px 14px;font-size:12px;line-height:1.55;margin:-10px 0 22px}.notice a{color:var(--blue);text-decoration:underline}