/* GenAI Class — shared design system (mobile-first)
   Base styles target ~320–430px phones. Layers up at 560 / 760 / 1024. */
:root{
  --ink:#171426; --ink2:#4A4560; --paper:#FFFFFF; --wash:#F4F2FC;
  --brand:#6B38C2; --brand-deep:#3D2A75; --amber:#FFB61D; --amber-deep:#C98F00; --line:#E4E0F0;
  --on-ink:#C9C4DE;
  --r:12px;
  --display:Archivo,system-ui,sans-serif;
  --body:Inter,system-ui,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:64px}
body{font-family:var(--body);color:var(--ink);background:var(--paper);line-height:1.6;font-size:16px;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:var(--brand)}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.mono{font-family:var(--mono)}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:720px}
p,li,h1,h2,h3{text-wrap:pretty}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-bottom:1px solid var(--line);z-index:50}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:56px;gap:12px}
.logo{font-family:var(--display);font-weight:900;font-size:19px;letter-spacing:-.5px;text-decoration:none;color:var(--ink);white-space:nowrap}
.logo em{font-style:normal;color:var(--brand)}
.logo{display:inline-flex;align-items:center;gap:8px}
.logo .wmk{display:inline}
/* Wordmark: gold underline separated from the letters (no overlap) */
.logo em,.logo-wm em{color:inherit;text-decoration:underline;text-decoration-color:var(--amber);text-decoration-thickness:.17em;text-underline-offset:.16em;text-decoration-skip-ink:none}
.logo{color:var(--ink)}

.nav ul{display:flex;align-items:center;gap:24px;list-style:none}
.nav ul a:not(.btn){text-decoration:none;color:var(--ink2);font-size:15px;font-weight:500}
.nav ul a:not(.btn):hover{color:var(--ink)}
.nav .links{display:none}
.nav .btn{padding:10px 16px;font-size:14px;min-height:44px;white-space:nowrap}
@media (max-width:359px){.nav .btn{padding:10px 12px;font-size:13px}.logo{font-size:17px}}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--amber);color:var(--ink);font-family:var(--display);font-weight:700;font-size:17px;line-height:1.2;text-decoration:none;padding:15px 26px;min-height:52px;border-radius:10px;border:none;cursor:pointer;box-shadow:0 2px 0 var(--amber-deep);text-align:center;transition:transform .12s}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(1px);box-shadow:0 1px 0 var(--amber-deep)}
.btn.ghost{background:transparent;border:2px solid var(--ink);box-shadow:none}
.btn.dark{background:var(--ink);color:#fff;box-shadow:0 2px 0 #000}
.btn.block{display:flex;width:100%}

/* ---------- type ---------- */
.kicker{display:inline-block;font-family:var(--mono);font-size:11.5px;font-weight:700;letter-spacing:1.2px;color:var(--brand);background:#fff;border:1px solid var(--line);padding:6px 12px;border-radius:999px;margin-bottom:20px}
h1{font-family:var(--display);font-weight:900;font-size:clamp(34px,9.6vw,64px);line-height:1.04;letter-spacing:-1.2px;max-width:820px}
h1 .u,h2 .u{box-shadow:inset 0 -.28em 0 var(--amber)}
h2{font-family:var(--display);font-weight:900;font-size:clamp(26px,7vw,40px);letter-spacing:-.7px;line-height:1.1;margin-bottom:14px}
h3{font-family:var(--display);letter-spacing:-.2px;line-height:1.25}
.code{font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:1.6px;color:var(--brand);display:block;margin-bottom:12px}
.lede{font-size:18px;color:var(--ink2);max-width:640px;margin:20px 0 28px}
.sub{color:var(--ink2);font-size:17px;max-width:640px}

/* ---------- hero ---------- */
.hero{background:var(--wash);padding:40px 0 48px;border-bottom:1px solid var(--line)}
.facts{display:grid;gap:8px;margin-top:24px;font-family:var(--mono);font-size:12.5px;color:var(--ink2)}
.facts b{color:var(--ink)}

/* ---------- sections ---------- */
section{padding:56px 0}
.band{background:var(--wash);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* pains / cards */
.cards{display:grid;grid-template-columns:1fr;gap:12px;margin-top:28px}
.card{border:1px solid var(--line);border-radius:var(--r);padding:18px 18px;background:#fff}
.card b{display:block;font-family:var(--display);font-size:17px;margin-bottom:4px}
.card p{font-size:15px;color:var(--ink2)}

/* syllabus rows */
.syllabus{margin-top:28px;border-top:2px solid var(--ink)}
.week{display:grid;grid-template-columns:1fr;gap:8px;padding:20px 0;border-bottom:1px solid var(--line)}
.week .no{font-family:var(--mono);font-weight:700;font-size:13px;color:var(--brand)}
.week h3{font-size:20px}
.week p{font-size:15px;color:var(--ink2);margin-top:4px}
.week .out{font-family:var(--mono);font-size:12.5px;color:var(--ink);background:var(--wash);border:1px solid var(--line);padding:10px 12px;border-radius:8px;justify-self:start}
.band .week .out{background:#fff}

/* two-column lists */
.split{display:grid;grid-template-columns:1fr;gap:32px;margin-top:28px}
.split ul{list-style:none;margin-top:10px}
.split li{padding:12px 0;border-bottom:1px solid var(--line);font-size:16px}
.split .no{color:var(--ink2)}
.split h3{font-family:var(--mono);font-size:13px;letter-spacing:1.5px}

/* pricing */
.tiers{display:grid;grid-template-columns:1fr;gap:20px;margin-top:36px;align-items:stretch}
.tier{border:1.5px solid var(--line);border-radius:14px;padding:26px 20px;display:flex;flex-direction:column;background:#fff;position:relative}
.tier.hot{border-color:var(--brand);border-width:2px;background:var(--wash)}
.band .tier.hot{background:#fff}
.tier .tag{position:absolute;top:-12px;left:20px;background:var(--brand);color:#fff;font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:1.2px;padding:4px 12px;border-radius:999px}
.tier h3{font-size:20px}
.price{font-family:var(--display);font-weight:900;font-size:40px;letter-spacing:-1px;margin:10px 0 2px;line-height:1.1}
.price s{font-size:20px;color:var(--ink2);font-weight:500;letter-spacing:0}
.per{font-size:13px;color:var(--ink2);margin-bottom:14px}
.tier ul{list-style:none;flex:1;margin-bottom:22px}
.tier li{font-size:15px;padding:8px 0 8px 24px;border-bottom:1px dashed var(--line);position:relative}
.tier li::before{content:"✓";color:var(--brand);font-weight:700;position:absolute;left:2px}

/* dark block */
.slab{background:var(--ink);color:#fff;border-radius:16px;padding:32px 22px;margin-top:24px}
.slab h2{color:#fff}
.slab p{color:var(--on-ink);max-width:680px}
.slab .big{font-family:var(--display);font-weight:900;font-size:23px;line-height:1.2;color:var(--amber);margin:14px 0 10px;letter-spacing:-.4px}
.slab .code{color:var(--amber)}

/* faq */
.faq details{border-bottom:1px solid var(--line)}
.faq summary{font-family:var(--display);font-weight:700;font-size:17px;cursor:pointer;padding:16px 28px 16px 0;list-style:none;position:relative;min-height:44px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:2px;top:12px;font-family:var(--mono);font-size:20px;color:var(--brand)}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--ink2);padding:0 0 18px;max-width:680px}

/* forms */
.form{display:flex;flex-direction:column;gap:10px;width:100%}
.form input{font:inherit;font-size:16px;padding:15px 16px;min-height:52px;border:1.5px solid var(--line);border-radius:10px;width:100%;background:#fff;color:var(--ink)}
.form input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(107,56,194,.15)}
.fine{font-size:13px;color:var(--ink2);margin-top:12px}

/* final */
.final{background:var(--wash);border-top:1px solid var(--line);text-align:center;padding:64px 0 72px}
.final h2{margin:0 auto 12px;max-width:720px}
.final p{color:var(--ink2);margin-bottom:24px}
.final .form{max-width:480px;margin:0 auto}

/* footer */
footer{border-top:1px solid var(--line);padding:28px 0 36px;font-size:14px;color:var(--ink2)}
footer .wrap{display:flex;flex-direction:column;gap:10px}
footer a{color:var(--ink2)}
footer nav{display:flex;gap:16px;flex-wrap:wrap}

/* mobile sticky CTA */
.mbar{position:fixed;left:0;right:0;bottom:0;z-index:60;background:rgba(255,255,255,.97);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:12px;transform:translateY(0);transition:transform .2s}
.mbar.hide{transform:translateY(110%)}
.mbar .meta{font-family:var(--mono);font-size:11.5px;line-height:1.35;color:var(--ink2);flex:1;min-width:0}
.mbar .meta b{color:var(--ink);display:block;font-size:13px}
.mbar .btn{min-height:46px;padding:12px 18px;font-size:15px;flex:none}
body.has-mbar{padding-bottom:76px}

/* ---------- ≥560 ---------- */
@media (min-width:560px){
  .wrap{padding:0 24px}
  .form.row{flex-direction:row}
  .form.row input{flex:1}
  .form.row .btn{flex:none}
  .btn.block{display:inline-flex;width:auto}
  .cards{grid-template-columns:1fr 1fr;gap:16px}
  .facts{display:flex;flex-wrap:wrap;gap:8px 24px}
  .nav .btn{padding:10px 20px;font-size:15px}
}
/* ---------- ≥760 (tablet / desktop) ---------- */
@media (min-width:760px){
  body{font-size:17px}
  .nav .wrap{height:64px}
  .logo{font-size:20px}
  .nav .links{display:flex}
  .kicker{font-size:13px;letter-spacing:1.5px;padding:6px 14px;margin-bottom:24px}
  .code{font-size:13px;letter-spacing:2px}
  .lede{font-size:20px;margin:24px 0 32px}
  .sub{font-size:18px}
  .hero{padding:72px 0 84px}
  section{padding:76px 0}
  .week{grid-template-columns:110px 1fr 260px;gap:20px;padding:24px 0;align-items:baseline}
  .week .no{font-size:14px}
  .week h3{font-size:21px}
  .week .out{justify-self:stretch}
  .split{grid-template-columns:1fr 1fr;gap:40px}
  .tiers{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
  .tier{padding:30px 26px}
  .price{font-size:42px}
  .slab{padding:52px 48px}
  .slab .big{font-size:26px}
  .faq summary{font-size:18px}
  .final{padding:88px 0}
  footer .wrap{flex-direction:row;justify-content:space-between;gap:20px;flex-wrap:wrap}
  .mbar{display:none}
  body.has-mbar{padding-bottom:0}
}
@media (min-width:1024px){
  .cards{grid-template-columns:repeat(4,1fr)}
  .cards.three{grid-template-columns:repeat(3,1fr)}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}