:root{
  --bg:#fafafa;--surface:#ffffff;--ink:#0a0a0a;--muted:#5b5b63;--line:rgba(10,10,10,.1);
  --accent:#4f46e5;--accent-ink:#ffffff;--accent-soft:rgba(79,70,229,.08);
  --shadow:0 1px 2px rgba(10,10,10,.05),0 12px 32px -12px rgba(10,10,10,.12);
  --radius:16px;--spring:cubic-bezier(.22,1,.36,1);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#09090b;--surface:#111113;--ink:#f4f4f5;--muted:#a1a1aa;--line:rgba(255,255,255,.1);
    --accent:#818cf8;--accent-ink:#09090b;--accent-soft:rgba(129,140,248,.12);
    --shadow:0 1px 2px rgba(0,0,0,.4),0 16px 40px -16px rgba(0,0,0,.7);
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:17px;line-height:1.65;font-feature-settings:"cv11","ss01";-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:inherit}
.wrap{width:100%;max-width:1120px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:8px;z-index:100}
.skip:focus{left:8px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}

/* header */
header.site{position:sticky;top:0;z-index:50;backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);background:color-mix(in srgb,var(--bg) 78%,transparent);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:-.02em;text-decoration:none}
.brand .logo{width:28px;height:28px}
nav.main{display:flex;gap:6px;align-items:center}
nav.main a{font-size:14.5px;font-weight:500;color:var(--muted);text-decoration:none;padding:8px 12px;border-radius:10px;transition:color .2s,background .2s}
nav.main a:hover{color:var(--ink);background:var(--accent-soft)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;color:var(--ink);font:inherit;font-size:14px;cursor:pointer}
@media(max-width:820px){
  .menu-btn{display:block}
  nav.main{position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;background:var(--bg);border-bottom:1px solid var(--line);padding:12px 20px 20px;display:none}
  nav.main.open{display:flex}
}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-weight:500;font-size:15.5px;text-decoration:none;padding:13px 22px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;transition:transform .25s var(--spring),box-shadow .25s,background .2s}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.btn:active{transform:translateY(0) scale(.98)}
.btn.primary{background:var(--accent);border-color:transparent;color:var(--accent-ink)}

/* type */
h1,h2,h3{letter-spacing:-.03em;line-height:1.1;margin:0;font-weight:600}
h1{font-size:clamp(38px,6.2vw,68px);letter-spacing:-.04em}
h2{font-size:clamp(28px,4vw,42px)}
h3{font-size:20px;letter-spacing:-.02em;line-height:1.25}
p{margin:0 0 1em}
.eyebrow{display:inline-flex;gap:8px;align-items:center;font-size:13px;font-weight:500;color:var(--accent);background:var(--accent-soft);padding:6px 12px;border-radius:999px;margin-bottom:20px}
.lead{font-size:clamp(18px,2vw,21px);color:var(--muted);max-width:60ch}
.muted{color:var(--muted)}

/* sections */
section{padding:88px 0}
section.tint{background:color-mix(in srgb,var(--accent) 3%,var(--bg));border-block:1px solid var(--line)}
.head{max-width:720px;margin-bottom:44px}
.head p{color:var(--muted);font-size:18px;margin-top:14px}

.hero{padding:72px 0 56px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.trust{display:flex;flex-wrap:wrap;gap:20px;margin-top:34px;font-size:14px;color:var(--muted)}
.trust span{display:inline-flex;gap:8px;align-items:center}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr}.hero{padding-top:44px}section{padding:64px 0}}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:transform .35s var(--spring)}
.card:hover{transform:translateY(-3px)}
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.g3{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.g3,.g2{grid-template-columns:1fr}}
.card .ill{border-radius:12px;background:var(--accent-soft);margin-bottom:18px;overflow:hidden}
.card p{color:var(--muted);font-size:16px;margin-bottom:0}
.card h3{margin-bottom:8px}
.tag{display:inline-block;font-size:12px;font-weight:500;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:3px 10px;margin-bottom:12px}

/* compare table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;min-width:680px;font-size:15.5px}
th,td{text-align:left;padding:16px 20px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-weight:600;font-size:14px;color:var(--muted);background:color-mix(in srgb,var(--bg) 60%,var(--surface))}
tr:last-child td{border-bottom:0}
td:first-child{font-weight:500;white-space:nowrap}

/* curriculum */
.mod{display:grid;grid-template-columns:56px 1fr;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.mod:last-child{border-bottom:0}
.num{font-variant-numeric:tabular-nums;font-weight:600;color:var(--accent);font-size:15px;background:var(--accent-soft);width:44px;height:44px;border-radius:12px;display:grid;place-items:center}
.mod p{color:var(--muted);margin:6px 0 0}
.mod ul{margin:10px 0 0;padding-left:18px;color:var(--muted);font-size:15.5px}

/* notice */
.notice{border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--surface);border-radius:12px;padding:18px 22px;color:var(--muted);font-size:15.5px}
.notice strong{color:var(--ink)}

/* faq */
details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:0 22px;margin-bottom:12px;transition:box-shadow .25s}
details[open]{box-shadow:var(--shadow)}
summary{cursor:pointer;list-style:none;padding:20px 0;font-weight:500;font-size:17.5px;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:22px;line-height:1;color:var(--muted);transition:transform .3s var(--spring)}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);padding-bottom:20px;margin:0}

/* footer */
footer.site{border-top:1px solid var(--line);padding:56px 0 40px;font-size:15px;color:var(--muted)}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
@media(max-width:800px){.foot{grid-template-columns:1fr 1fr}}
.foot h4{margin:0 0 12px;color:var(--ink);font-size:14px;font-weight:600}
.foot a{display:block;text-decoration:none;padding:4px 0}
.foot a:hover{color:var(--ink)}
.fine{margin-top:36px;padding-top:24px;border-top:1px solid var(--line);font-size:13.5px}

/* article pages */
.doc{max-width:760px;padding:56px 0 80px}
.doc h1{font-size:clamp(32px,5vw,48px);margin-bottom:12px}
.doc h2{font-size:24px;margin:40px 0 12px}
.doc li{margin-bottom:6px}
.doc p,.doc li{color:color-mix(in srgb,var(--ink) 82%,var(--muted))}

/* steps + pricing */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
@media(max-width:980px){.steps{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.steps{grid-template-columns:1fr}}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.step b{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--accent);color:var(--accent-ink);font-variant-numeric:tabular-nums;margin-bottom:14px;font-weight:600}
.step h3{font-size:18px;margin-bottom:6px}
.step p{color:var(--muted);font-size:15px;margin:0}
.price{max-width:520px;margin:0 auto;text-align:left}
.price .amt{font-size:60px;font-weight:600;letter-spacing:-.04em;font-variant-numeric:tabular-nums;line-height:1}
.price ul{list-style:none;padding:0;margin:22px 0}
.price li{padding:8px 0 8px 28px;position:relative;border-bottom:1px solid var(--line);font-size:16px}
.price li:last-child{border:0}
.price li::before{content:"\2713";position:absolute;left:0;color:var(--accent);font-weight:600}
.two{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:700px){.two{grid-template-columns:1fr}}
.list{margin:12px 0 0;padding-left:18px;color:var(--muted);font-size:15.5px}
.list li{margin-bottom:6px}


/* images */
.ill{line-height:0}
.ill img,.float img{width:100%;height:auto;display:block}
img.logo{width:28px;height:28px;border-radius:8px}
.sh{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.sh b{margin:0}
.sh img{width:44px;height:44px}
:root[data-theme="dark"]{--bg:#09090b;--surface:#111113;--ink:#f4f4f5;--muted:#a1a1aa;--line:rgba(255,255,255,.1);--accent:#818cf8;--accent-ink:#09090b;--accent-soft:rgba(129,140,248,.12);--shadow:0 1px 2px rgba(0,0,0,.4),0 16px 40px -16px rgba(0,0,0,.7);color-scheme:dark}

/* blog */
.article{max-width:740px;margin:0 auto;padding:40px 0 72px}
.article h1{font-size:clamp(30px,5vw,46px);margin:14px 0}
.article h2{font-size:clamp(23px,3vw,30px);margin:44px 0 12px}
.article h3{margin:26px 0 8px}
.article p,.article li{font-size:18px;line-height:1.7}
.article li{margin-bottom:8px}
.article ul,.article ol{padding-left:22px}
.crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:14px;color:var(--muted)}
.crumbs a{text-decoration:none}.crumbs a:hover{color:var(--ink)}
.byline{color:var(--muted);font-size:15px}
.cover{width:100%;height:auto;border-radius:16px;border:1px solid var(--line);margin:22px 0 28px}
.takeaways,.toc{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px 24px;margin:26px 0}
.box-title{font-weight:600;margin:0 0 10px;letter-spacing:-.01em}
.takeaways ul{margin:0}.toc ol{margin:0;padding-left:20px}
.toc li{font-size:16px;margin-bottom:6px}.toc a{text-decoration:none;color:var(--accent)}.toc a:hover{text-decoration:underline}
blockquote.prompt{margin:16px 0;padding:16px 20px;border-left:3px solid var(--accent);background:var(--accent-soft);border-radius:0 12px 12px 0;font-size:16.5px;line-height:1.6}
.article .table-wrap{margin:18px 0}
.article a{color:var(--accent)}
.related{display:grid;gap:14px;grid-template-columns:1fr 1fr;margin-top:12px}
@media(max-width:620px){.related{grid-template-columns:1fr}}
.rcard{display:block;text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;color:var(--ink)!important}
.rcard strong{display:block;font-size:16.5px;letter-spacing:-.01em;margin-bottom:4px}
.rcard span{color:var(--muted);font-size:15px}
.cta-box{margin-top:44px;padding:26px;border:1px solid var(--line);border-radius:16px;background:var(--accent-soft)}
.cta-box p{margin:0 0 14px}
.post-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .35s var(--spring)}
.post-card:hover{transform:translateY(-3px)}
.post-card img{width:100%;height:auto;aspect-ratio:1200/630;display:block}
.post-card .pc{padding:20px}
.post-card h3{margin:0 0 8px}
.post-card p{color:var(--muted);font-size:15.5px;margin:0 0 10px}
.post-card small{color:var(--muted);font-size:13.5px}
.blog-head{padding:56px 0 8px;max-width:720px}
.blog-head h1{font-size:clamp(34px,5vw,52px)}
.blog-head p{color:var(--muted);font-size:19px;margin-top:14px}
.blog-grid{padding:32px 0 80px}

/* motion */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .7s var(--spring),transform .7s var(--spring)}
.reveal.in{opacity:1;transform:none}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.float{animation:float 6s ease-in-out infinite}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}

.fig{margin:28px 0}.fig img{width:100%;height:auto;border-radius:14px;border:1px solid var(--line);display:block}.fig figcaption{color:var(--muted);font-size:14px;margin-top:10px;text-align:center}
.cover,.post-card img{aspect-ratio:16/9;object-fit:cover}.post-card picture,.cover-wrap picture{display:block}.float picture{display:block}
.cover{width:100%}

.brand .wm{white-space:nowrap;font-size:17px}.brand .logo{border-radius:9px}@media(max-width:420px){.brand .wm{font-size:15px}}