/* HumAIn — plain CSS, mobile-first, no build step. */
:root{
  --ink:#0f1b3d; --ink-soft:#3b4766; --bg:#f7f8fc; --card:#ffffff; --line:#dfe3ef;
  --navy:#0f1b3d; --navy-2:#18285a; --amber:#ffb800; --amber-d:#e3a200; --blue:#1f4fd8; --blue-soft:#e8eeff;
  --green:#0a7a4b; --red:#b42318; --radius:14px; --shadow:0 1px 2px rgba(15,27,61,.06),0 6px 20px rgba(15,27,61,.07);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.6;font-size:1.0625rem}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px;border-radius:4px}
.site-header :focus-visible,.hero :focus-visible,.band :focus-visible,.site-footer :focus-visible{outline-color:var(--amber)}
.signup :focus-visible,.card :focus-visible{outline-color:var(--blue)}
.skip{position:absolute;left:-999px;top:0;background:var(--amber);color:var(--ink);padding:.6rem 1rem;z-index:100;font-weight:700}
.skip:focus{left:8px;top:8px}
.wrap{width:100%;max-width:1100px;margin:0 auto;padding:0 1.1rem}
.narrow{max-width:760px}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em;margin:0 0 .6rem}
h1{font-size:clamp(2rem,6vw,3.2rem)}
h2{font-size:clamp(1.5rem,4vw,2.1rem);margin-top:2.2rem}
h3{font-size:1.2rem;margin-top:1.6rem}
p{margin:0 0 1rem}
.lead{font-size:1.2rem;color:var(--ink-soft)}
.muted{color:var(--ink-soft)}
.small{font-size:.9rem}

/* header */
.site-header{background:var(--navy);color:#fff;position:sticky;top:0;z-index:50}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:60px;gap:1rem}
.brand{display:flex;align-items:center;gap:.55rem;color:#fff;text-decoration:none;font-weight:800;font-size:1.3rem;letter-spacing:-.02em}
.brand svg{width:34px;height:34px;flex:none}
.brand b{color:var(--amber)}
.nav-toggle{background:transparent;border:2px solid #ffffff55;color:#fff;border-radius:10px;padding:.45rem .8rem;font:inherit;font-weight:600;cursor:pointer}
.nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--navy-2);padding:.6rem 1.1rem 1rem}
.nav.open{display:block}
.nav a{display:block;color:#fff;text-decoration:none;padding:.65rem .2rem;font-weight:600;border-bottom:1px solid #ffffff1f}
.nav a[aria-current="page"]{color:var(--amber)}
.nav a.cta{margin-top:.7rem;background:var(--amber);color:var(--ink);text-align:center;border-radius:999px;border:0;padding:.7rem 1rem}
@media (min-width:860px){
  .nav-toggle{display:none}
  .nav{display:flex!important;position:static;background:none;padding:0;gap:.2rem;align-items:center}
  .nav a{border:0;padding:.5rem .8rem;border-radius:999px}
  .nav a:hover{background:#ffffff1a}
  .nav a.cta{margin:0 0 0 .5rem}
}
/* no-JS: let nav wrap */
html:not(.js) .nav{display:flex;flex-wrap:wrap;position:static;padding:.4rem 1.1rem}
html:not(.js) .nav-toggle{display:none}
html:not(.js) .site-header .wrap{flex-wrap:wrap}

/* hero */
.hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 100%);color:#fff;padding:2.6rem 0 3rem;overflow:hidden}
.hero .wrap{display:grid;gap:2rem;align-items:center}
.hero h1 em{font-style:normal;color:var(--amber)}
.hero .lead{color:#d6def5}
.hero-art{display:flex;justify-content:center}
.hero-art svg{width:min(260px,70vw);height:auto}
@media (min-width:820px){.hero .wrap{grid-template-columns:1.3fr .7fr}.hero{padding:4rem 0}}
.eyebrow{display:inline-block;background:#ffffff1a;border:1px solid #ffffff33;color:#ffe8a3;padding:.25rem .75rem;border-radius:999px;font-size:.85rem;font-weight:700;margin-bottom:1rem}
.btn-row{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.3rem}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;font:inherit;font-weight:700;text-decoration:none;border-radius:999px;padding:.75rem 1.3rem;border:2px solid transparent;cursor:pointer;min-height:46px;line-height:1.1}
.btn-primary{background:var(--amber);color:var(--ink)}
.btn-primary:hover{background:var(--amber-d)}
.btn-ghost{background:transparent;color:#fff;border-color:#ffffff66}
.btn-ghost:hover{background:#ffffff1a}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{background:var(--navy-2)}
.btn-line{background:#fff;border-color:var(--ink);color:var(--ink)}
.btn-line:hover{background:var(--blue-soft)}
.btn[disabled]{opacity:.55;cursor:not-allowed}

/* sections / cards */
section.block{padding:2.2rem 0}
.section-head{max-width:640px;margin-bottom:1.4rem}
.section-head h2{margin-top:0}
.grid{display:grid;gap:1.1rem}
@media (min-width:640px){.grid.cols-2,.grid.cols-3{grid-template-columns:repeat(2,1fr)}}
@media (min-width:960px){.grid.cols-3{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.2rem;display:flex;flex-direction:column}
.card h3{margin-top:0}
.card p:last-child{margin-bottom:0}
.card .push{margin-top:auto}
.icon{width:44px;height:44px;border-radius:12px;background:var(--blue-soft);display:grid;place-items:center;font-size:1.4rem;margin-bottom:.7rem}
.video-card{padding:0;overflow:hidden}
.video-card .thumb{aspect-ratio:16/9;background:var(--navy);overflow:hidden}
.video-card .thumb img{width:100%;height:100%;object-fit:cover}
.video-card .body{padding:1rem 1.2rem 1.3rem;display:flex;flex-direction:column;flex:1}
.video-card h3{font-size:1.1rem;margin:.1rem 0 .4rem}
.video-card a.stretch{color:inherit;text-decoration:none}
.video-card a.stretch::after{content:"";position:absolute;inset:0}
.video-card{position:relative}
.video-card:hover{border-color:var(--blue)}
.tag{display:inline-block;font-size:.78rem;font-weight:700;padding:.15rem .6rem;border-radius:999px;background:var(--blue-soft);color:#16379b;margin:0 .3rem .3rem 0}
.tag.amber{background:#fff1c7;color:#6b4a00}
.tag.green{background:#dcf5e8;color:#0a5d39}

/* CTA band */
.band{background:var(--navy);color:#fff;border-radius:20px;padding:1.6rem;display:grid;gap:1.2rem}
.band h2{margin-top:0;color:#fff}
.band p{color:#d6def5}
@media (min-width:820px){.band{grid-template-columns:1fr 1fr;padding:2.2rem;align-items:start}}

/* sign-up form */
.signup{background:#fff;color:var(--ink);border-radius:var(--radius);padding:1.2rem;border:1px solid var(--line)}
.signup h3{margin-top:0}
.signup,.signup p,.signup h3,.band .signup p{color:var(--ink)}
.signup .privacy-note,.signup .privacy-note p,.band .signup .privacy-note p{color:var(--ink-soft)}
.signup label.consent{display:flex;gap:.7rem;align-items:flex-start;font-size:.93rem;line-height:1.45;margin:.8rem 0;cursor:pointer}
.signup label.consent input{width:22px;height:22px;flex:none;margin-top:.1rem;accent-color:var(--blue)}
.signup .embed-slot{margin-top:.6rem}
.signup .embed-slot[hidden]{display:none}
.todo-box{border:2px dashed #c9791b;background:#fff8e6;color:#5c3a00;border-radius:10px;padding:.9rem 1rem;font-size:.92rem}
.todo-box code{background:#fff0c2}
.privacy-note{font-size:.84rem;color:var(--ink-soft);border-top:1px solid var(--line);margin-top:.9rem;padding-top:.7rem}
.privacy-note p{margin:0 0 .4rem}
.linkbtn{background:none;border:0;color:var(--blue);text-decoration:underline;font:inherit;cursor:pointer;padding:.3rem 0}
.status{min-height:1.4em;font-weight:600;color:var(--green);font-size:.92rem}

/* gate */
.gate{max-width:680px;margin:1.5rem 0}
.gate-lock{font-size:.9rem;font-weight:700;color:#6b4a00;background:#fff1c7;display:inline-block;border-radius:999px;padding:.2rem .8rem;margin-bottom:.6rem}
html.js [data-gated]{display:none}
html.js.unlocked [data-gated]{display:block}
html.js.unlocked [data-gate-panel]{display:none}
html:not(.js) [data-gate-panel]{display:none}
html:not(.unlocked) [data-unlocked-only]{display:none}

/* course */
.module-list{list-style:none;padding:0;margin:0;display:grid;gap:.8rem}
.module{display:grid;grid-template-columns:auto 1fr;gap:.9rem;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.1rem;text-decoration:none;color:inherit;align-items:start}
a.module:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.module .num{width:42px;height:42px;border-radius:50%;background:var(--navy);color:var(--amber);font-weight:800;display:grid;place-items:center}
.module.done .num{background:var(--green);color:#fff}
.module h3{margin:0 0 .15rem;font-size:1.08rem}
.module p{margin:0;color:var(--ink-soft);font-size:.95rem}
.part-title{margin:1.8rem 0 .8rem;font-size:1.05rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft)}
.lesson{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem}
@media (min-width:700px){.lesson{padding:2rem 2.4rem}}
.lesson h2:first-child{margin-top:0}
.lesson ul,.lesson ol{padding-left:1.3rem;margin:0 0 1rem}
.lesson li{margin:.3rem 0}
.callout{border-left:5px solid var(--amber);background:#fff8e1;border-radius:8px;padding:.8rem 1rem;margin:1.2rem 0}
.callout.blue{border-color:var(--blue);background:var(--blue-soft)}
.callout.red{border-color:var(--red);background:#fdecea}
.callout strong:first-child{display:block;margin-bottom:.15rem}
.exercise{border:2px solid var(--navy);border-radius:var(--radius);padding:1rem 1.2rem;margin:1.6rem 0;background:#fcfdff}
.exercise h3{margin-top:0}
.exercise h3::before{content:"✏️ "}
.takeaways{background:var(--blue-soft);border-radius:var(--radius);padding:1rem 1.2rem}
.takeaways h3{margin-top:0}
.lesson-meta{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1rem}
.lesson-nav{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-top:1.6rem}
.sources{font-size:.9rem;color:var(--ink-soft)}
.sources ul{padding-left:1.1rem}
table{border-collapse:collapse;width:100%;font-size:.95rem;margin:1rem 0}
th,td{border:1px solid var(--line);padding:.5rem .6rem;text-align:left;vertical-align:top}
th{background:#f0f3fb}
.table-wrap{overflow-x:auto}
.crumbs{font-size:.9rem;margin:1rem 0}
.progress{height:10px;background:#e4e8f5;border-radius:99px;overflow:hidden;margin:.5rem 0 .3rem}
.progress>span{display:block;height:100%;background:var(--green);width:0;transition:width .3s}

/* prompt blocks */
pre.prompt{margin:0;white-space:pre-wrap;word-wrap:break-word;font-family:var(--mono);font-size:.88rem;line-height:1.5;background:#0f1b3d;color:#eaf0ff;border-radius:10px;padding:.9rem 1rem;max-height:340px;overflow:auto}
.lesson pre.prompt{max-height:none}
.prompt-wrap{position:relative}
.copy-btn{display:inline-flex;align-items:center;gap:.4rem;background:var(--amber);color:var(--ink);border:0;border-radius:999px;font:inherit;font-weight:800;font-size:.9rem;padding:.55rem 1rem;cursor:pointer;min-height:42px}
.copy-btn:hover{background:var(--amber-d)}
.copy-btn.copied{background:#bff0d6}
.prompt-actions{display:flex;flex-wrap:wrap;gap:.6rem;align-items:center;margin-top:.7rem}
.token-est{font-size:.82rem;color:var(--ink-soft)}
.filters{display:flex;flex-wrap:wrap;gap:.5rem;margin:1rem 0}
.chip{border:2px solid var(--line);background:#fff;color:var(--ink);border-radius:999px;font:inherit;font-weight:700;padding:.45rem .95rem;cursor:pointer;min-height:42px}
.chip[aria-pressed="true"]{background:var(--navy);border-color:var(--navy);color:#fff}
.search{width:100%;max-width:420px;font:inherit;padding:.7rem 1rem;border:2px solid var(--line);border-radius:999px;background:#fff}
.search:focus{border-color:var(--blue);outline:none}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
details.agent summary{cursor:pointer;font-weight:700;padding:.4rem 0}
.meta-list{list-style:none;padding:0;margin:.4rem 0 .8rem;font-size:.92rem;color:var(--ink-soft)}
.meta-list li{margin:.15rem 0}
.notice{background:#fff;border:1px solid var(--line);border-left:5px solid var(--blue);border-radius:8px;padding:.8rem 1rem;margin:1rem 0;font-size:.95rem}

/* footer */
.site-footer{background:var(--navy);color:#cfd8f3;padding:2rem 0 2.4rem;margin-top:3rem;font-size:.93rem}
.site-footer a{color:#fff}
.site-footer .cols{display:grid;gap:1.4rem}
@media (min-width:720px){.site-footer .cols{grid-template-columns:2fr 1fr 1fr}}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:.3rem 0}
.site-footer .legal{border-top:1px solid #ffffff22;margin-top:1.4rem;padding-top:1rem;font-size:.82rem;color:#a9b6dc}