:root{
  --green:#005030;
  --green-deep:#003b23;
  --orange:#F47321;
  --paper:#FBFAF7;
  --ink:#132019;
  --muted:#5b6a61;
  --line:#dfe3dd;
  --card:#ffffff;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.6;
  font-size:16px;
}
.mono{font-family:'IBM Plex Mono',monospace}
a:focus-visible{outline:2px solid var(--orange);outline-offset:2px}

/* ---------- Nav ---------- */
nav{
  position:sticky;top:0;z-index:50;
  background:var(--green);
  border-bottom:3px solid var(--orange);
}
.nav-inner{
  max-width:1100px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;
  height:60px;gap:16px;
}
.nav-brand{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 75,'wght' 800;
  color:#fff;text-decoration:none;font-size:15px;
  letter-spacing:.04em;text-transform:uppercase;white-space:nowrap;
}
.nav-brand span{color:var(--orange)}
.nav-links{display:flex;gap:4px;overflow-x:auto;align-items:center}
.nav-links a{
  color:rgba(255,255,255,.85);text-decoration:none;
  font-size:13px;font-weight:500;padding:8px 12px;border-radius:6px;
  white-space:nowrap;transition:background .15s,color .15s;
}
.nav-links a:hover,.nav-links a:focus-visible{background:rgba(255,255,255,.12);color:#fff}
.nav-links a.active{background:rgba(255,255,255,.16);color:#fff}
.nav-links a.switch{border:1px solid rgba(255,255,255,.35);margin-left:6px}

/* ---------- Hero (home page only) ---------- */
header.hero{
  background:var(--green);
  color:#fff;
  padding:72px 24px 0;
  overflow:hidden;
}
.hero-inner{max-width:1100px;margin:0 auto}
.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--orange);margin-bottom:20px;
}
h1{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 68,'wght' 900;
  font-size:clamp(40px,7.5vw,80px);
  line-height:.98;text-transform:uppercase;
  letter-spacing:.01em;
  max-width:16ch;
}
h1 em{font-style:normal;color:var(--orange)}
.hero-sub{
  margin-top:22px;max-width:640px;
  color:rgba(255,255,255,.85);font-size:17px;
}
.aaa{
  margin-top:52px;
  display:grid;grid-template-columns:1fr 1fr 1fr;
  border-top:1px solid rgba(255,255,255,.25);
}
.aaa div{
  padding:22px 20px 26px;
  border-right:1px solid rgba(255,255,255,.25);
}
.aaa div:last-child{border-right:none}
.aaa .k{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 70,'wght' 800;
  font-size:clamp(18px,3vw,26px);text-transform:uppercase;
  display:flex;align-items:baseline;gap:10px;
}
.aaa .k::before{content:attr(data-a);color:var(--orange);font-size:1.4em}
.aaa p{font-size:13px;color:rgba(255,255,255,.7);margin-top:6px}

/* ---------- Page header (subpages) ---------- */
header.page{
  background:var(--green);color:#fff;padding:52px 24px;
}
.page-inner{max-width:1100px;margin:0 auto}
header.page h1{font-size:clamp(30px,5vw,48px)}
header.page .hero-sub{margin-top:14px;font-size:15px}

/* ---------- Sections ---------- */
main{max-width:1100px;margin:0 auto;padding:0 24px}
.sec{padding:64px 0 8px}
.sec-head{
  display:flex;align-items:baseline;gap:16px;
  border-bottom:3px solid var(--ink);padding-bottom:14px;margin-bottom:36px;
}
.sec-head h2{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 70,'wght' 850;
  font-size:clamp(26px,4vw,40px);text-transform:uppercase;line-height:1;
}
.sec-head .tag{
  font-family:'IBM Plex Mono',monospace;font-size:12px;
  color:var(--muted);letter-spacing:.06em;text-transform:uppercase;
}
.sec-intro{max-width:680px;color:var(--muted);margin:-16px 0 36px}

/* ---------- Welcome ---------- */
.welcome{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:36px 40px;font-size:17px;
}
.welcome p{margin-bottom:16px}
.welcome p:last-child{margin-bottom:0}
.welcome strong{color:var(--green)}
.welcome a{color:var(--green);font-weight:600}

/* ---------- Vertical cards ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px}
.vcard{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:26px;display:flex;flex-direction:column;gap:12px;
  transition:transform .15s,box-shadow .15s;
}
.vcard:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(0,60,35,.10)}
.chip{
  font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.08em;
  background:var(--green);color:#fff;border-radius:4px;
  padding:4px 8px;align-self:flex-start;text-transform:uppercase;
}
.vcard h3{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 78,'wght' 750;
  font-size:21px;line-height:1.15;
}
.vcard p{font-size:14px;color:var(--muted);flex:1}
.btn{
  display:inline-flex;align-items:center;gap:8px;align-self:flex-start;
  background:var(--orange);color:#fff;text-decoration:none;
  font-weight:600;font-size:14px;padding:10px 16px;border-radius:8px;
  transition:background .15s;
}
.btn:hover,.btn:focus-visible{background:#d95f0e}
.btn.ghost{background:transparent;color:var(--green);border:1.5px solid var(--green)}
.btn.ghost:hover,.btn.ghost:focus-visible{background:var(--green);color:#fff}

/* ---------- Empty state ---------- */
.empty{
  background:var(--card);border:1.5px dashed var(--line);border-radius:12px;
  padding:44px 40px;text-align:left;
}
.empty .tag-mini{
  font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--orange);margin-bottom:10px;display:block;
}
.empty h3{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 78,'wght' 750;
  font-size:22px;margin-bottom:10px;
}
.empty p{color:var(--muted);max-width:60ch}

/* ---------- Videos ---------- */
.topic{
  background:var(--card);border:1px solid var(--line);border-radius:12px;
  overflow:hidden;display:flex;flex-direction:column;
}
.topic .frame{position:relative;aspect-ratio:16/9;background:#0a0f0c}
.topic iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.topic .body{padding:20px 22px 24px}
.topic h3{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 80,'wght' 700;
  font-size:18px;line-height:1.2;margin-bottom:8px;
}
.topic .cat{
  font-family:'IBM Plex Mono',monospace;font-size:11px;
  color:var(--orange);letter-spacing:.08em;text-transform:uppercase;
  display:block;margin-bottom:6px;
}
.topic p{font-size:14px;color:var(--muted)}
.vgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:20px}

/* ---------- Frameworks ---------- */
.doc-list{display:flex;flex-direction:column;gap:0;border:1px solid var(--line);border-radius:12px;background:var(--card);overflow:hidden}
.doc{
  display:flex;align-items:center;gap:18px;padding:20px 24px;
  border-bottom:1px solid var(--line);text-decoration:none;color:inherit;
  transition:background .15s;
}
.doc:last-child{border-bottom:none}
.doc:hover,.doc:focus-visible{background:#f2f5f1}
.doc .pdf{
  font-family:'IBM Plex Mono',monospace;font-size:10px;font-weight:500;
  background:var(--green);color:#fff;border-radius:4px;padding:5px 7px;flex-shrink:0;
}
.doc .t{font-weight:600;font-size:15px}
.doc .d{font-size:13px;color:var(--muted)}
.doc .arrow{margin-left:auto;color:var(--orange);font-size:18px;flex-shrink:0}

/* ---------- Footer ---------- */
footer{
  margin-top:80px;background:var(--green-deep);color:rgba(255,255,255,.8);
  padding:48px 24px;font-size:14px;
}
.foot-inner{max-width:1100px;margin:0 auto;display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:center}
footer a{color:var(--orange);font-weight:600;text-decoration:none}
footer a:hover{text-decoration:underline}
.never{
  font-family:'Archivo',sans-serif;
  font-variation-settings:'wdth' 70,'wght' 850;
  text-transform:uppercase;color:#fff;font-size:18px;letter-spacing:.03em;
}
.never span{color:var(--orange)}

/* ---------- Landing picker ---------- */
.landing-body--center{
  background:var(--green);min-height:100vh;
  display:flex;align-items:center;justify-content:center;
}
.landing-main--center{width:100%;padding:24px}
.picker{
  max-width:760px;margin:0 auto;
  display:grid;grid-template-columns:1fr 1fr;gap:24px;
}
.course{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:40px 32px;text-decoration:none;color:inherit;
  display:flex;flex-direction:column;align-items:flex-start;gap:18px;
  transition:transform .15s,box-shadow .15s,border-color .15s;
  position:relative;overflow:hidden;
}
.course::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;background:var(--orange)}
.course:hover,.course:focus-visible{transform:translateY(-4px);box-shadow:0 18px 40px rgba(0,60,35,.14);border-color:var(--green)}
.course .code{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--green)}
.course h2{font-family:'Archivo',sans-serif;font-variation-settings:'wdth' 74,'wght' 800;font-size:28px;line-height:1.1;text-transform:uppercase}
.course .go{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14px;color:var(--orange);margin-top:auto}
.course .go .arrow{transition:transform .15s}
.course:hover .go .arrow,.course:focus-visible .go .arrow{transform:translateX(4px)}

@media (max-width:640px){
  .aaa{grid-template-columns:1fr}
  .aaa div{border-right:none;border-bottom:1px solid rgba(255,255,255,.25)}
  .aaa div:last-child{border-bottom:none}
  .welcome{padding:28px 24px}
  .empty{padding:32px 24px}
  .nav-brand{font-size:13px}
  .picker{grid-template-columns:1fr}
}