:root{color-scheme:light;--ink:#183039;--muted:#52646c;--teal:#0f766e;--teal-dark:#115e59;--line:#d7e4e3;--soft:#f0f7f5;--paper:#fff;--radius:20px;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;background:var(--surface);color:var(--ink)}
*{box-sizing:border-box}body{margin:0}a{color:var(--teal-dark);text-underline-offset:4px}a:hover{color:#064e49}p{line-height:1.75;margin:0 0 1rem}ul,ol{line-height:1.8}h1,h2,h3{line-height:1.18;letter-spacing:-.025em;margin:0 0 1rem}h1{font-size:clamp(2.4rem,5.2vw,4.5rem);max-width:960px}h2{font-size:clamp(1.8rem,3vw,2.65rem)}h3{font-size:1.25rem}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button:disabled{cursor:not-allowed;opacity:.6}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #b45309;outline-offset:5px}a,button{transition:background-color .15s,color .15s}main{display:block}.skip-link{position:absolute;left:16px;top:-100px;z-index:10;padding:12px 18px;background:var(--surface);border:2px solid var(--teal)}.skip-link:focus{top:12px}.site-header{max-width:1280px;margin:auto;padding:24px 40px;display:flex;justify-content:space-between;align-items:center;gap:28px;border-bottom:1px solid var(--line)}.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-size:1.55rem;font-weight:750;letter-spacing:-.05em;white-space:nowrap}.brand-symbol{height:32px;width:32px;display:inline-grid;place-items:center;background:var(--teal);color:#fff;border-radius:11px;font-size:1.6rem;letter-spacing:-.1em;padding-right:2px}.site-header nav{display:flex;align-items:center;justify-content:flex-end;gap:26px;flex-wrap:wrap}.site-header nav a{color:var(--ink);font-size:.94rem;text-decoration:none;font-weight:600}.site-header nav a:hover{text-decoration:underline}.site-header .nav-start{padding:11px 17px;color:#fff;background:var(--teal);border-radius:9px}.home,.page{max-width:1280px;margin:auto;padding:0 40px}.hero{display:grid;grid-template-columns:1.35fr .85fr;align-items:center;gap:64px;padding:80px 0 56px}.eyebrow{color:var(--teal-dark);font-size:.78rem;text-transform:uppercase;letter-spacing:.13em;font-weight:750;margin-bottom:18px}.lead{font-size:1.2rem;color:var(--muted);max-width:750px;line-height:1.7}.hero .lead{max-width:590px}.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:28px 0 16px}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:48px;padding:13px 20px;border:1px solid var(--teal);border-radius:10px;text-decoration:none;cursor:pointer;font-weight:650;line-height:1.35}.primary{background:var(--teal);color:#fff}.primary:hover{background:var(--teal-dark);color:#fff}.secondary{background:var(--surface);color:var(--teal-dark)}.secondary:hover{background:var(--soft)}.small{font-size:.86rem;color:var(--muted);line-height:1.6}.hero-card{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:0 14px 30px #18303908;transform:rotate(1deg)}.hero-card h2{font-size:1.45rem}.hero-card .eyebrow{font-size:.68rem}.hero-card p{font-size:.91rem}.demo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;max-width:260px;margin:24px auto}.demo-grid span{aspect-ratio:1;display:grid;place-items:center;border-radius:9px;background:var(--surface);font-size:1.45rem;font-weight:700;border:1px solid var(--line)}.demo-grid .cell-1{color:#0f766e}.demo-grid .cell-2{color:#8b5a12}.demo-grid .cell-3{color:#514780}.text-link{font-weight:700;text-decoration:none;display:inline-flex;gap:10px;align-items:center}.text-link:hover{text-decoration:underline}.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 0}.facts div{display:flex;align-items:center;gap:16px}.facts strong{font-size:2.1rem;font-weight:750;letter-spacing:-.04em}.facts span{font-size:.9rem;line-height:1.5;color:var(--muted);max-width:190px}.section{padding:64px 0}.section-intro{max-width:820px;color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:32px}.topic-card{display:flex;flex-direction:column;align-items:flex-start;padding:26px 22px;border:1px solid var(--line);border-radius:15px;color:var(--ink);text-decoration:none;background:var(--surface)}.topic-card:hover{border-color:var(--teal);color:var(--ink)}.topic-number{color:var(--teal);font-weight:700;font-size:.86rem;display:inline-block;margin-bottom:26px}.topic-card h3{min-height:3em}.topic-card p{color:var(--muted);font-size:.92rem;flex:1}.topic-card .text-link{font-size:.85rem;margin-top:12px;color:var(--teal-dark)}.soft{background:var(--soft);padding:42px;border-radius:var(--radius);margin:0 0 32px}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;padding:0;list-style:none;margin:32px 0}.steps span{display:inline-block;margin-bottom:16px;font-size:.86rem;color:var(--teal);font-weight:750}.steps p{font-size:.97rem;color:var(--muted)}.split{display:grid;grid-template-columns:1fr 1.25fr;gap:70px}.split p{color:var(--muted)}.study-plan{display:grid;grid-template-columns:1fr 1fr;gap:64px;background:var(--ink);border-radius:var(--radius);padding:44px;margin:0 0 60px;color:#fff}.study-plan .eyebrow{color:#91e0d4}.study-plan p{color:#dce9e8}.study-plan form{display:grid;gap:10px}.study-plan label{font-size:.93rem;font-weight:600}.study-plan input[type=email],.study-plan select{width:100%;padding:12px 14px;border:1px solid #b6ccc8;border-radius:8px;min-height:46px;color:var(--ink);background:var(--surface);margin-bottom:9px}.study-plan .check{display:block;font-weight:400;font-size:.85rem;line-height:1.6;position:relative;padding-left:28px}.study-plan .check input{position:absolute;left:0;top:3px;width:18px;height:18px;accent-color:var(--teal)}.study-plan .check a{color:#bcf1e9}.study-plan button{margin:10px 0 4px;justify-self:start;background:#c1f1e7;color:#123c35;border-color:#c1f1e7}.study-plan button:hover{background:#a0e9d9}.study-plan .small{margin-bottom:0}.page{padding-top:30px;padding-bottom:70px}.breadcrumb{display:flex;align-items:center;gap:12px;line-height:1.5;font-size:.82rem;color:var(--muted);margin-bottom:42px}.breadcrumb span:last-child{overflow-wrap:anywhere}.page>h1{font-size:clamp(2.1rem,4.8vw,3.55rem);max-width:940px}.page>.lead{margin-bottom:30px}.page>.section{padding:32px 0}.page section>h2:not(:first-child){margin-top:36px}.page>.soft{padding:36px}.page>section:not(.pricing-grid),.page>article,.page>.sources{max-width:1000px}.page section p,.page article p{max-width:860px}.page section li{margin:7px 0}.page section h2,.sources h2{font-size:1.75rem}.page section h3{font-size:1.2rem;margin-top:24px}.page .topic-grid{margin-bottom:20px}.pricing-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:24px;margin:38px 0}.price-card{border:1px solid var(--line);border-radius:var(--radius);padding:32px;background:var(--surface)}.price-card.premium{background:var(--soft);border:2px solid #82bcb2}.price{font-size:2.7rem;font-weight:750;letter-spacing:-.045em;margin:14px 0}.price span{font-size:1.1rem;letter-spacing:0;color:var(--muted)}.price-card p:not(.price):not(.eyebrow){font-size:.97rem}.price-card ul{padding-left:20px;margin-bottom:26px}.notice{background:var(--surface);border-left:4px solid var(--teal);padding:16px 18px;border-radius:6px}.notice strong{display:block}.sources{padding:28px;margin-top:36px;background:var(--soft);border-radius:14px}.sources ul{padding-left:20px}.sources .small{margin-bottom:0}.site-footer{max-width:1280px;margin:auto;padding:40px;display:grid;grid-template-columns:1.7fr 1fr 1fr;gap:45px;border-top:1px solid var(--line)}.site-footer .brand{font-size:1.4rem;margin-bottom:16px}.site-footer p{font-size:.9rem;color:var(--muted);max-width:460px}.site-footer nav{display:flex;flex-direction:column;gap:13px;font-size:.87rem}.site-footer nav a{text-decoration:none}.site-footer nav a:hover{text-decoration:underline}.token-page{max-width:860px;min-height:65vh;padding-top:70px}.token-page h1{margin-bottom:24px}.token-page button{margin:12px 0 20px}table{border-collapse:collapse;width:100%;margin:24px 0;font-size:.95rem}th,td{padding:12px 14px;text-align:left;border:1px solid var(--line)}th{background:var(--soft)}caption{text-align:left;font-weight:650;margin-bottom:10px}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--soft);padding:20px;border-radius:10px;font-size:1rem;line-height:1.7}details{border:1px solid var(--line);padding:18px 22px;border-radius:10px;margin:18px 0}summary{cursor:pointer;font-weight:650}details[open] summary{margin-bottom:16px}blockquote{margin:24px 0;padding:10px 22px;border-left:3px solid var(--teal);background:var(--soft)}svg{max-width:100%;height:auto}.callout,.example,.worked-example,.guide-note{padding:24px;background:var(--soft);border:1px solid var(--line);border-radius:14px;margin:22px 0}.cta{margin:28px 0}.table-scroll{overflow-x:auto}.page img{max-width:100%;height:auto}.guide-steps{padding-left:24px}.sources a{overflow-wrap:anywhere}
@media(max-width:1000px){.site-header{padding:22px 28px}.site-header nav{gap:18px}.home,.page{padding-left:28px;padding-right:28px}.hero{gap:34px;padding-top:56px}.topic-grid{grid-template-columns:repeat(2,1fr)}.topic-card h3{min-height:0}.site-footer{padding:32px 28px;gap:28px}.facts{gap:22px}.facts div{gap:12px}.facts strong{font-size:1.85rem}.study-plan{gap:32px;padding:32px}.split{gap:32px}.hero-card{padding:24px}.hero .button{font-size:.9rem}}
@media(max-width:720px){.site-header{align-items:flex-start;flex-direction:column;gap:20px;padding:20px}.site-header nav{width:100%;justify-content:flex-start;gap:13px 19px}.site-header nav a{font-size:.86rem}.site-header .nav-start{padding:8px 13px}.home,.page{padding-left:20px;padding-right:20px}.hero{grid-template-columns:1fr;gap:30px;padding:42px 0 34px}.hero h1{font-size:2.65rem}.hero-card{transform:none;max-width:480px;width:100%;padding:26px}.hero-card h2{font-size:1.3rem}.demo-grid{max-width:230px}.facts{gap:20px;grid-template-columns:1fr;padding:24px 0}.facts div{gap:22px}.facts strong{min-width:75px}.facts span{max-width:none}.section{padding:40px 0}.soft{padding:28px 24px}.steps,.split,.study-plan,.pricing-grid{grid-template-columns:1fr}.steps{gap:20px}.steps h3{margin-bottom:8px}.steps span{margin-bottom:8px}.topic-grid{gap:13px}.topic-card{padding:20px 16px}.topic-card h3{font-size:1.12rem}.topic-card p{font-size:.87rem}.topic-number{margin-bottom:16px}.topic-card .text-link{font-size:.8rem;gap:5px}.study-plan{gap:24px;padding:28px 24px;margin-bottom:40px}.site-footer{grid-template-columns:1fr 1fr;padding:32px 20px;gap:28px}.site-footer>div{grid-column:1/-1}.breadcrumb{margin-bottom:30px}.page>h1{font-size:2.35rem}.page .lead{font-size:1.08rem}.price-card{padding:26px}.pricing-grid{gap:18px}.page>.soft{padding:26px}.page .sources{padding:24px}.actions{align-items:stretch}.actions .button{width:100%;max-width:370px}.token-page{padding-top:42px}th,td{padding:9px;font-size:.86rem}}
@media(max-width:390px){.topic-grid{grid-template-columns:1fr}.hero h1{font-size:2.35rem}.page>h1{font-size:2.1rem}.site-header nav{gap:11px 16px}.site-footer{grid-template-columns:1fr}.site-footer>div{grid-column:auto}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.guide-frames{display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap;margin:20px 0}.guide-frame{display:flex;flex-direction:column;align-items:center;gap:8px;margin:0;width:140px}.guide-frame svg{display:block;width:112px;height:112px}.guide-frame figcaption{font-size:.85rem;color:var(--muted)}.page section table{display:block;max-width:100%;overflow-x:auto}.page .guide-latin{width:auto;min-width:250px}.page .guide-latin td,.page .guide-latin th{text-align:center;min-width:48px}

.site-header nav a[aria-current=page]{color:var(--teal-dark);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:7px}
.guide-toc{max-width:860px;margin:28px 0;background:var(--soft);border-color:var(--line)}
.guide-toc nav ol{display:grid;grid-template-columns:1fr 1fr;gap:0 24px;margin:0;padding-left:22px}
.guide-toc nav a{display:inline-flex;align-items:center;min-height:36px}
.page h2[id]{scroll-margin-top:24px}
.page section p{max-width:75ch}
.study-plan #plan-status:empty{display:none}
.study-plan #plan-status:not(:empty){padding:14px;border:1px solid #8bb7ae;border-radius:8px;line-height:1.65}

@media(max-width:720px){
 .site-header{position:relative;gap:12px;padding:20px 20px 8px}
 .site-header nav{gap:0 17px;padding-right:0}
 .site-header nav a{display:inline-flex;align-items:center;min-height:44px}
 .site-header .nav-start{position:absolute;top:20px;right:20px;min-height:36px}
 .hero h1{font-size:2.35rem;line-height:1.15}
 .page>h1{font-size:2.15rem;line-height:1.18}
 .guide-toc nav ol{grid-template-columns:1fr}
 .guide-toc nav a{min-height:44px}
 .page .guide-latin th{min-width:40px;font-size:.75rem;padding:8px 5px}
 .page .guide-latin td{min-width:40px;padding:9px 5px}
}
@media(max-width:390px){.site-header nav{gap:0 12px}.site-header nav a{font-size:.8rem}}


:root { --page:#f4f8f7; --surface:#fff; --ink:#152b3e; --muted:#536c7d; --link:#126854; --accent:#0f766e; --accent-hover:#115e59; --line:#cadbd7; --soft:#e7f6f0; --subtle:#f0f4f8; --focus:#a66b00; --danger:#a22e2e; --danger-soft:#fff0f0; --warning-soft:#fff4d9; --warning-line:#e9cf84; --on-accent:#fff; --hero-dark:#183039; color-scheme:light; }
html[data-theme="dark"] { --page:#111c22; --paper:#111c22; --surface:#1b2b33; --ink:#ecf3f5; --muted:#bacbd2; --link:#8fe3ce; --accent:#69d4bc; --accent-hover:#97e4d2; --line:#48616a; --soft:#203d3a; --subtle:#26373f; --focus:#ffd185; --danger:#ffaaa5; --danger-soft:#442b30; --warning-soft:#3b3425; --warning-line:#9b854b; --on-accent:#102c26; --hero-dark:#163c3a; --teal:#69d4bc; --teal-dark:#8fe3ce; color-scheme:dark; }
html[data-theme="warm"] { --page:#f6eedf; --paper:#f6eedf; --surface:#fff9ee; --ink:#3d3025; --muted:#705c49; --link:#76521d; --accent:#785322; --accent-hover:#5f3e18; --line:#d6c3a6; --soft:#eee2ca; --subtle:#f1e6d3; --focus:#805000; --danger:#922c2c; --danger-soft:#f7e1dc; --warning-soft:#f8e4b9; --warning-line:#be9455; --on-accent:#fff9ee; --hero-dark:#463b2b; --teal:#785322; --teal-dark:#76521d; color-scheme:light; }
.appearance-bar { display:flex; align-items:center; justify-content:flex-end; gap:10px; max-width:1280px; margin:0 auto; padding:10px 26px; color:var(--muted); font:500 13px/1.4 system-ui,sans-serif; }
.appearance-bar select { width:auto; min-height:36px; padding:5px 30px 5px 10px; border:1px solid var(--line); border-radius:8px; background:var(--surface); color:var(--ink); cursor:pointer; }
.support-tools { max-width:1228px; margin:44px auto 0; padding:32px 24px; border-top:1px solid var(--line); color:var(--ink); }
.support-tools h2 { font-size:24px; margin:0 0 16px; }
.support-tools h3 { font-size:17px; margin:24px 0 8px; }
.support-intro { display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:12px; }
.support-actions { display:flex; gap:10px; flex-wrap:wrap; margin-bottom:16px; }
.support-button { display:inline-flex; align-items:center; min-height:44px; padding:9px 15px; border:1px solid var(--line); border-radius:9px; text-decoration:none; background:var(--surface); color:var(--link); font-weight:600; gap:5px; }
.support-button:hover { background:var(--soft); color:var(--link); }
.support-grid { display:grid; grid-template-columns:1fr 1fr; gap:24px; align-items:start; }
.support-tools details { border:1px solid var(--line); border-radius:12px; padding:18px; margin:12px 0; background:var(--surface); scroll-margin-top:24px; }
.support-tools summary { cursor:pointer; font-weight:650; min-height:28px; }
.support-tools details[open] > summary { margin-bottom:18px; }
.support-tools p { line-height:1.65; margin:0 0 14px; }
.support-tools a { color:var(--link); }
.support-small { font-size:13px; color:var(--muted); font-weight:400; }
.support-form { display:grid; gap:10px; }
.support-form label { font-weight:600; }
.support-form textarea { font:inherit; width:100%; min-height:110px; resize:vertical; border:1px solid var(--line); border-radius:8px; padding:12px; background:var(--page); color:var(--ink); }
.support-form textarea::placeholder { color:var(--muted); opacity:1; }
.support-submit { width:fit-content; min-height:44px; padding:10px 18px; border:1px solid var(--accent); border-radius:9px; background:var(--accent); color:var(--on-accent); font:600 15px/1.4 system-ui,sans-serif; cursor:pointer; }
.support-submit:hover { background:var(--accent-hover); color:var(--on-accent); }
.support-submit:disabled { opacity:.65; cursor:wait; }
.support-status { overflow-wrap:anywhere; color:var(--link); }
.support-status:empty { display:none; }
.primary { color:var(--on-accent); }
.primary:hover { color:var(--on-accent); }
@media(max-width:650px) { .support-grid { grid-template-columns:1fr; gap:0; } .support-tools { padding:24px 20px; } .support-actions { width:100%; } .appearance-bar { padding:8px 20px; } }

html,body { background:var(--page); color:var(--ink); } .study-plan { background:var(--hero-dark); } .site-header .nav-start,.brand-symbol { color:var(--on-accent); } .secondary { color:var(--link); } .secondary:hover { color:var(--link); } a:hover { color:var(--link); } .demo-grid span { border-color:var(--line); color:var(--ink); } .hero-card .demo-grid .cell-1 { color:var(--link); } .hero-card .demo-grid .cell-2 { color:var(--ink); } .hero-card .demo-grid .cell-3 { color:var(--ink); } .study-plan input[type=email],.study-plan select { background:var(--surface); color:var(--ink); } .visual-frames svg { background:#fff; }

.support-form input[type=email] { font:inherit; width:100%; min-height:44px; border:1px solid var(--line); border-radius:8px; padding:10px 12px; background:var(--page); color:var(--ink); } .support-form input::placeholder {color:var(--muted);opacity:1;}