/* Elementary environment hub — same tokens and components as the landing page (public/index.html). */
:root{
  --ink:#10233d; --ink-2:#1c3657; --paper:#f4f6f9; --white:#fff;
  --pencil:#f5b700; --pencil-soft:#fff3cc; --teal:#0e7c6b; --teal-soft:#e2f2ee;
  --muted:#51627a; --line:#d9e1eb;
  --body:"IBM Plex Sans Arabic",system-ui,sans-serif;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.8 var(--body);-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{font-family:var(--body);font-weight:700;margin:0;line-height:1.35;text-wrap:balance}
p{margin:0}
:focus-visible{outline:3px solid var(--pencil);outline-offset:3px;border-radius:6px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 26px;border-radius:12px;font:600 17px var(--body);text-decoration:none}
.btn-primary{background:var(--pencil);color:var(--ink)}
.btn-primary:hover{background:#ffc520}

.nav{position:sticky;top:0;z-index:20;background:var(--ink);color:#fff}
.nav .wrap{display:flex;align-items:center;gap:28px;height:68px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font:700 22px var(--body)}
.logo svg{width:34px;height:34px}
.nav ul{display:flex;gap:26px;list-style:none;margin:0;padding:0;margin-inline-start:auto}
.nav ul a{text-decoration:none;color:#c9d4e3;font-size:16px}
.nav ul a:hover{color:#fff}

.hero{background:var(--ink);color:#fff;padding:56px 0 64px}
.hero h1{font-size:clamp(30px,4.6vw,52px)}
.hero .lead{color:#c9d4e3;font-size:clamp(17px,2vw,20px);max-width:40em;margin:18px 0 28px}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap}

.unit{background:var(--white);border-radius:28px;padding:32px;margin:40px 0;border-top:6px solid var(--teal)}
#g5{border-top-color:var(--pencil)}
#teachers{border-top-color:var(--ink)}
.unit-head h2{font-size:clamp(26px,3.4vw,38px)}
.unit-head p{color:var(--muted);margin-top:6px}
.dnav ul{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:20px 0 4px}
.dnav a{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border:1.5px solid var(--line);border-radius:999px;text-decoration:none;font-weight:500}
.dnav a:hover{background:var(--ink);border-color:var(--ink);color:#fff}

.dom{border-top:2px solid var(--ink);margin-top:32px;padding-top:16px}
.dom h3{font-size:24px}
.dom h3 small{font-size:15px;font-weight:500;color:var(--muted);margin-inline-start:8px}
.dom h4{font-size:19px;margin:18px 0 4px;color:var(--ink-2)}
.about{color:var(--muted);font-size:16px}
.acts{list-style:none;padding:0;margin:14px 0 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.acts li{border:1.5px solid var(--line);border-radius:14px;padding:12px 16px;display:flex;flex-direction:column;gap:2px}
.acts li:hover{border-color:var(--ink)}
.acts a{display:flex;justify-content:space-between;align-items:baseline;gap:10px;text-decoration:none;font-weight:600}
.acts a .nm{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}
.pr{flex:none;font-size:13px;font-weight:600;padding:1px 10px;border-radius:8px;background:var(--teal-soft);color:#0a6656}
.st{font-size:14px;color:var(--muted)}
.cd{font-size:12.5px;color:var(--muted);text-align:end;word-spacing:4px}
.notes{margin:16px 0 0;padding-inline-start:22px;display:grid;gap:8px}

footer{background:#0b1a2e;color:#93a3b8;font-size:15px;padding:28px 0}
footer .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
footer a{color:#c9d4e3}
footer a:hover{color:#fff}
footer ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 20px}
.skip{position:absolute;inset-inline-start:12px;top:-60px;z-index:50;background:var(--pencil);color:var(--ink);padding:10px 18px;border-radius:10px;font-weight:700;text-decoration:none}
.skip:focus{top:12px}
main:focus{outline:none}

@media (max-width:700px){
  .nav ul{gap:14px}
  .nav ul li:last-child{display:none}
  .unit{padding:22px 16px;border-radius:20px}
  .acts{grid-template-columns:1fr}
}
@media (max-width:520px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  .nav .wrap{gap:14px}
  .hero .ctas .btn{flex:1 1 40%}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}