:root{--ink:#151923;--paper:#fff;--soft:#f3f5f9;--blue:#304dff;--lime:#d6fa59;--line:#d8dce5;--muted:#515b6d;--radius:20px;--width:1180px;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;font-size:17px;line-height:1.6}a{color:inherit}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}button{cursor:pointer}img{display:block;max-width:100%;height:auto}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.08;letter-spacing:-.045em}h1{font-size:clamp(44px,5.7vw,76px);font-weight:800}h2{font-size:clamp(32px,4vw,48px)}h3{font-size:24px;letter-spacing:-.025em}p+p{margin-top:18px}small,.small{font-size:14px}.wrap{width:min(var(--width),calc(100% - 64px));margin-inline:auto}.skip{position:absolute;left:20px;top:-100px;background:var(--lime);padding:12px;z-index:99}.skip:focus{top:10px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.nav{min-height:90px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{text-decoration:none;font-size:27px;font-weight:800;letter-spacing:-1.2px;white-space:nowrap}.brand-dot{display:inline-block;background:var(--lime);width:13px;height:13px;border:2px solid var(--ink);border-radius:50%;margin-left:3px}.nav-links{display:flex;align-items:center;gap:30px}.nav-links>a{font-size:15px;font-weight:700;text-decoration:none}.nav-links>a:hover{text-decoration:underline;text-underline-offset:5px}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:13px 24px;border-radius:8px;background:var(--ink);border:2px solid var(--ink);color:#fff;text-decoration:none;font-size:16px;font-weight:700;line-height:1.35;text-align:center}.button:hover{background:var(--blue);border-color:var(--blue);color:#fff}.button.light{background:var(--lime);color:var(--ink);border-color:var(--lime)}.button.light:hover{background:#e5ff92;border-color:#e5ff92}.button.secondary{background:transparent;color:var(--ink);border:1px solid var(--line)}.button.secondary:hover{border-color:var(--ink);background:var(--soft)}.text-link{font-weight:700;text-underline-offset:5px}.eyebrow{text-transform:uppercase;font-size:13px;font-weight:800;letter-spacing:.11em;margin-bottom:20px}.eyebrow:before{content:'';display:inline-block;width:24px;height:3px;background:currentColor;vertical-align:middle;margin-right:9px}.hero{padding:65px 0 70px;display:grid;grid-template-columns:1.04fr 1fr;align-items:center;gap:60px}.hero-copy h1{max-width:650px}.hero-copy h1 span{display:block;color:var(--blue)}.hero-copy>p:not(.eyebrow){font-size:19px;color:var(--muted);max-width:560px;margin-top:25px;line-height:1.6}.actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:30px}.hero-art{position:relative;background:var(--blue);padding:34px 40px 35px;border-radius:26px;isolation:isolate}.hero-art:before{content:'';position:absolute;width:110px;height:110px;border:1px solid #ffffff5c;border-radius:50%;left:-21px;bottom:25px;z-index:-1}.hero-art img{width:100%;max-height:525px;object-fit:contain;background:white;box-shadow:10px 12px 0 #172468;transform:rotate(-3deg);border:1px solid #101a44}.art-note{position:absolute;right:-10px;bottom:26px;background:var(--lime);color:var(--ink);border:2px solid var(--ink);padding:13px 17px;font-size:14px;font-weight:800;transform:rotate(3deg);line-height:1.3;box-shadow:3px 4px 0 var(--ink)}.hero-meta{font-size:14px!important;margin-top:20px!important}.stats{background:var(--ink);color:white}.stats-inner{display:grid;grid-template-columns:repeat(4,1fr);padding-block:26px}.stat{padding:2px 26px;border-left:1px solid #50545d}.stat:first-child{padding-left:0;border:0}.stat strong{display:block;font-size:35px;line-height:1.15;letter-spacing:-.04em}.stat span{font-size:14px;color:#dce0e9}.section{padding-block:80px}.section.soft{background:var(--soft)}.section-head{display:flex;justify-content:space-between;gap:35px;align-items:end;margin-bottom:32px}.section-head p{color:var(--muted);max-width:520px;margin-top:16px}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.feature{padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:white}.feature-number{font-size:14px;font-weight:800;color:var(--blue);margin-bottom:24px;display:block}.feature p{color:var(--muted);margin-top:16px;font-size:16px}.showcase{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}.showcase-image{padding:26px;background:var(--soft);border-radius:var(--radius)}.showcase-image img{max-height:510px;margin:auto;box-shadow:0 7px 30px #17243e20}.showcase-copy p{margin-top:22px;color:var(--muted)}.chip{display:inline-block;font-size:13px;line-height:1.35;font-weight:700;letter-spacing:.02em;border:1px solid var(--line);background:white;padding:7px 10px;border-radius:5px}.chip.blue{background:#e9edff;color:#2336ba;border-color:#cdd5ff}.chip.lime{background:var(--lime);border-color:var(--lime)}.callout{background:var(--blue);color:white;border-radius:24px;padding:42px 48px;display:flex;align-items:center;justify-content:space-between;gap:45px}.callout h2{max-width:670px}.callout p{margin-top:16px;color:#e1e5ff}.callout .button{white-space:nowrap}.faq{max-width:820px;margin-inline:auto}.faq h2{margin-bottom:30px}.faq details{border-bottom:1px solid var(--line);padding:22px 0}.faq summary{cursor:pointer;font-size:19px;font-weight:700;padding-right:15px;line-height:1.5}.faq details p{color:var(--muted);margin-top:14px;font-size:16px}.site-footer{padding:40px 0;border-top:1px solid var(--line)}.footer-inner{display:flex;justify-content:space-between;gap:30px;align-items:center}.footer-copy{font-size:14px;color:var(--muted);margin-top:7px}.footer-links{display:flex;gap:24px;font-size:14px}.page-heading{padding:55px 0 42px}.page-heading h1{font-size:clamp(40px,5vw,62px);max-width:950px}.page-heading p:not(.eyebrow){color:var(--muted);max-width:730px;margin-top:22px;font-size:18px}.subnav{display:flex;flex-wrap:wrap;gap:12px;margin-top:25px}.catalog-tools{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:30px}.field label{display:block;font-size:14px;font-weight:700;margin-bottom:8px}.field input,.field select{border:1px solid #aab2c0;border-radius:8px;background:white;min-height:48px;padding:10px 14px;color:var(--ink);width:100%}.field{flex:1}.field.search{max-width:440px}.chapter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.chapter-card{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:white;display:flex;flex-direction:column}.chapter-card[hidden]{display:none}.chapter-card a{text-decoration:none;display:flex;flex-direction:column;height:100%}.chapter-card a:hover h3{color:var(--blue)}.chapter-thumb{height:220px;background:#e8ecf4;overflow:hidden;padding:17px 34px 0;border-bottom:1px solid var(--line)}.chapter-thumb img{width:100%;box-shadow:0 3px 12px #0002}.chapter-card-body{padding:25px;display:flex;flex-direction:column;flex:1}.chapter-card .eyebrow{color:var(--blue);font-size:12px;margin-bottom:12px}.chapter-card h3{font-size:24px}.chapter-card p{color:var(--muted);font-size:15px;margin-top:13px;flex:1}.card-action{font-size:14px;font-weight:700;color:var(--blue);margin-top:20px;display:block}.count{font-size:14px;color:var(--muted);margin-bottom:18px}.empty{padding:45px 20px;text-align:center;background:var(--soft);border-radius:12px}.reader{background:var(--soft);padding:30px 0 65px}.reader-toolbar{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px}.reader-controls{display:flex;gap:10px;align-items:center}.reader-controls button{min-width:48px;min-height:48px;border:1px solid var(--line);border-radius:8px;background:white;padding:10px 14px}.reader-controls button:hover{background:var(--lime)}.reader-controls button:disabled{opacity:.45;cursor:default;background:#fff}.reader-controls span{min-width:55px;text-align:center;font-size:14px}.reader .field{max-width:480px}.reader-grid{display:grid;grid-template-columns:minmax(0,780px) 1fr;gap:35px;align-items:start}.sample-page{background:white;box-shadow:0 4px 25px #1a26321c;border:1px solid var(--line);margin:0}.sample-page img{width:100%}.sample-aside{position:sticky;top:28px}.sample-aside h2{font-size:28px;margin-top:18px}.sample-aside p{font-size:16px;color:var(--muted);margin-top:15px}.sample-aside .button{margin-top:22px;width:100%}.sample-aside .text-link{display:block;margin-top:20px;font-size:15px}.lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.lesson-card{border:1px solid var(--line);border-radius:16px;padding:26px;background:white}.lesson-card h3{margin-top:20px;font-size:25px}.lesson-card p{font-size:16px;color:var(--muted);margin-top:15px}.lesson-card small{display:block;margin-top:18px;color:var(--muted)}.prose{max-width:750px}.prose h2{font-size:30px;margin-top:38px}.prose p{margin-top:18px;color:var(--muted)}.notice{padding:20px 24px;border-left:4px solid var(--blue);background:#eef1ff;border-radius:0 8px 8px 0;margin-top:25px;max-width:820px}.notice p{font-size:16px!important;margin:0!important}.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}body:has(dialog[open]){overflow:hidden}noscript p{padding:20px;background:#fff9bd}.sale-note{margin-top:17px;font-size:14px;color:var(--muted)}
@media(max-width:900px){.wrap{width:calc(100% - 40px)}.hero{gap:30px;padding-block:45px}.hero h1{font-size:50px}.hero-art{padding:25px}.hero-copy>p:not(.eyebrow){font-size:17px}.feature-grid{gap:15px}.feature{padding:22px}.showcase{gap:35px}.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reader-grid{grid-template-columns:minmax(0,1fr) 260px;gap:22px}.reader-controls span{display:none}.callout{padding:35px}.nav-links{gap:18px}.nav-links .button{padding-inline:16px}.section{padding-block:60px}}
@media(max-width:650px){.wrap{width:calc(100% - 36px)}.nav{min-height:80px;gap:18px;flex-wrap:wrap;padding:19px 0 16px}.brand{font-size:25px}.nav-links{width:100%;justify-content:space-between;gap:12px}.nav-links>a{font-size:14px}.nav-links .button{min-height:40px;padding:8px 13px;font-size:14px}.hero{grid-template-columns:1fr;gap:36px;padding:38px 0 42px}.hero h1{font-size:clamp(42px,12vw,58px)}.hero-copy>p:not(.eyebrow){font-size:18px}.hero-art{padding:26px 40px;margin-inline:7px}.hero-art img{max-height:420px}.art-note{right:-7px;bottom:25px}.actions{gap:12px}.actions .button{flex:1;padding-inline:15px}.eyebrow{margin-bottom:15px}.stats-inner{grid-template-columns:1fr 1fr;row-gap:24px;padding-block:24px}.stat{padding-inline:20px}.stat:nth-child(3){border:0;padding-left:0}.stat strong{font-size:30px}.stat span{font-size:13px}.section{padding-block:48px}.section-head{display:block}.section-head .text-link{display:inline-block;margin-top:20px}.feature-grid,.showcase,.lesson-grid{grid-template-columns:1fr}.feature-number{margin-bottom:14px}.showcase{gap:28px}.showcase-image img{max-height:450px}.callout{display:block;padding:29px 25px}.callout h2{font-size:33px}.callout .button{margin-top:25px;white-space:normal}.footer-inner{align-items:start;flex-direction:column}.footer-links{gap:22px}.page-heading{padding:35px 0}.page-heading h1{font-size:42px}.page-heading p:not(.eyebrow){font-size:17px}.catalog-tools{display:block}.catalog-tools .field{max-width:none;margin-top:18px}.chapter-grid{grid-template-columns:1fr}.chapter-thumb{height:235px;padding-inline:55px}.reader-toolbar{display:block}.reader-controls{justify-content:space-between;margin-top:18px}.reader-controls span{display:block}.reader-grid{grid-template-columns:1fr}.sample-aside{position:static}.sample-aside h2{font-size:30px}.reader .wrap{width:calc(100% - 24px)}.sample-aside{padding-inline:6px}.faq summary{font-size:18px}.lesson-card{padding:23px}.prose h2{font-size:28px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}