:root{
  --navy:#0a3264; --navy2:#0f4f90; --blue:#1264b3; --green:#18804f;
  --gold:#b67b16; --red:#c94747; --ink:#1f2b37; --muted:#66798c;
  --line:#d8e3ee; --bg:#f5f7fa; --panel:#ffffff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;direction:rtl;background:var(--bg);font-family:"Segoe UI",Tahoma,Arial,sans-serif;color:var(--ink)}
a{text-decoration:none;color:inherit}
p,li{line-height:2}
.topbar{
  position:sticky;top:0;z-index:50;min-height:62px;padding:10px 18px;
  background:linear-gradient(90deg,#082a55,#0f4d88);color:#fff;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;
  box-shadow:0 3px 15px rgba(0,0,0,.12)
}
.menu{width:54px;height:40px;border:1px solid #ffffff66;border-radius:8px;display:grid;place-items:center;font-size:25px;background:#ffffff08}
.brand{justify-self:center;font-size:21px;font-weight:800}.brand b{color:#ffcc28}
.actions{display:flex;gap:10px;flex-wrap:wrap}.actions a,.actions button{border:1px solid #ffffff55;border-radius:8px;padding:8px 14px;background:#ffffff08;color:#fff;font:inherit;cursor:pointer}
.pagewrap{max-width:1540px;margin:auto;display:grid;grid-template-columns:330px minmax(0,1fr);gap:18px;padding:18px}
.sidebar{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;
  box-shadow:0 4px 15px rgba(9,44,82,.05);align-self:start;position:sticky;top:82px
}
.sidebar h2{margin:0 0 14px;color:var(--navy);font-size:24px}
.navitem{
  display:grid;grid-template-columns:44px 1fr;gap:10px;align-items:center;
  padding:10px 12px;border:1px solid #dfe7ef;border-radius:11px;margin:9px 0;background:#fff;
}
.navitem:hover{border-color:#9fc2e2;background:#f4f8fc}
.navitem.active{background:linear-gradient(90deg,#0c5bae,#0a3f80);color:#fff;border-color:#0c5bae}
.navicon{width:38px;height:38px;border-radius:9px;background:#edf5fc;color:#0b579f;display:grid;place-items:center;font-weight:800;font-size:18px}
.active .navicon{background:#ffffff1a;color:#fff}
.printlink{margin-top:18px;padding:14px;border:1px solid var(--line);border-radius:12px;background:#fbfcfd;display:flex;gap:12px;align-items:center;color:var(--navy);font-weight:700}
.main{min-width:0}
.content{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px 22px 22px;
  box-shadow:0 4px 14px rgba(9,44,82,.04)
}
.lessonhead{display:grid;grid-template-columns:160px 1fr 120px;align-items:start;gap:18px}
.qrblock{text-align:center;color:var(--navy);font-size:13px}.qrblock img{width:112px;height:112px;border:2px solid #1e5e9e;border-radius:8px;padding:5px;background:#fff}
.youtube{font-weight:700;margin-top:7px}.yticon{display:inline-grid;place-items:center;width:45px;height:30px;border-radius:7px;background:#e72620;color:#fff;font-size:18px;margin-right:5px}
.titlearea{text-align:center}.titlearea h1{margin:4px 0 8px;color:var(--navy);font-size:42px;line-height:1.15}.greenline{width:120px;height:5px;border-radius:4px;background:#24a364;margin:0 auto 14px}
.computericon{font-size:62px;text-align:left}
.rule{border:0;border-top:1px solid #cbd9e6;margin:20px 0}
.topic-title{font-size:25px;font-weight:900;color:var(--green);margin:18px 0 10px;display:flex;align-items:center;gap:9px}.topic-title.blue{color:var(--navy2)}
.lead{font-size:17px;line-height:2.1;margin:6px 0}
.bulletline{display:flex;gap:10px;align-items:flex-start;margin:10px 0;font-size:17px;line-height:2.0}.dot{width:9px;height:9px;border-radius:50%;background:var(--blue);margin-top:17px;flex:none}.dot.green{background:var(--green)}
.term{font-weight:900;color:#0671cf}.term.green{color:#11814d}
.flowline{display:grid;grid-template-columns:repeat(7,max-content);justify-content:center;align-items:center;gap:14px;margin:14px 0 20px}
.arrow{font-size:29px;color:#113f73}
.stage{width:170px;min-height:145px;border:1.8px solid #bfd1e2;border-radius:12px;background:#fbfdff;padding:12px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.stage .emoji{font-size:44px}.stage h3{margin:0;font-size:21px}.stage small{font-size:16px}.stage.input{border-color:#7fb0e3;background:#f5f9ff;color:#0f5aad}.stage.process{border-color:#8ec0a7;background:#f4fbf7;color:#247151}.stage.store{border-color:#ddb96e;background:#fffaf0;color:#9c6913}.stage.output{border-color:#e39a9a;background:#fff6f6;color:#ad3d3d}
.detailgrid{display:grid;grid-template-columns:1fr 1.35fr 1fr 1fr;gap:14px}
.detail{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff}
.detail.input{border-color:#91b8dd;background:#fbfdff}.detail.process{border-color:#91c1ab;background:#f9fcfa}.detail.store{border-color:#d9bb78;background:#fffdf7}.detail.output{border-color:#dfa3a3;background:#fffafa}
.detail h3{text-align:center;margin:0 0 8px;font-size:19px}.detail p{margin:5px 0;line-height:1.9}
.opcols{display:grid;grid-template-columns:1fr 1fr;gap:12px}.opcols h4{text-align:center;color:var(--green);margin:0 0 7px}.oprow{display:flex;justify-content:space-between;border-bottom:1px dashed #dfe5eb;padding:5px 0}
.cards2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff}.card h3{margin:0 0 10px;color:var(--navy)}
.points{margin:0;padding-right:22px}.points li{margin:8px 0}
.comparehead{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}.comparehead div{padding:13px;border-radius:11px;text-align:center;font-weight:900;font-size:20px}.comp{background:#edf5fc;color:#0e5da7}.human{background:#eef8f2;color:#267352}
.factbox{border-right:5px solid var(--blue);background:#f4f8fc;padding:14px 16px;border-radius:11px;margin:16px 0}.factbox.green{border-color:var(--green);background:#f2faf6}.factbox.gold{border-color:var(--gold);background:#fff9ec}
.binary{background:#112536;color:#95f08b;font:900 32px Consolas,monospace;letter-spacing:8px;text-align:center;border-radius:13px;padding:22px;margin:18px 0;direction:ltr}
.bits{display:grid;grid-template-columns:repeat(8,1fr);gap:8px;direction:ltr}.bits span{border:2px solid #9fbddd;border-radius:9px;text-align:center;padding:11px 0;font:900 22px Consolas;color:var(--navy)}
.units{display:grid;gap:9px}.unit{display:grid;grid-template-columns:130px 1fr 1fr;gap:12px;padding:10px;border:1px solid var(--line);border-radius:10px}.unit b{color:var(--navy)}
table.data{width:100%;border-collapse:collapse;margin:12px 0}table.data th,table.data td{border:1px solid #d7e1ea;padding:10px;text-align:center}table.data th{background:#edf4fa;color:var(--navy)}
.softwaregrid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.soft{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff}.soft h3{margin:0 0 8px;color:var(--navy)}
.langgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.lang{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff}.lang h3{margin:0 0 8px;color:var(--navy)}
.codebox{direction:ltr;background:#0f2235;color:#a5ef98;padding:16px;border-radius:12px;font:700 18px Consolas,monospace;text-align:left}
.footerbar{margin-top:22px;background:linear-gradient(90deg,#073766,#0e558f);border-radius:12px;padding:10px 12px;color:#fff;display:flex;align-items:center;justify-content:space-between}.footerbar a{border:1px solid #ffffff50;padding:7px 13px;border-radius:8px}
@media(max-width:1050px){
 .pagewrap{grid-template-columns:1fr}.sidebar{position:static}.lessonhead{grid-template-columns:1fr}.qrblock,.computericon{text-align:center}
 .flowline{grid-template-columns:1fr}.arrow{transform:rotate(-90deg);text-align:center}.stage{width:100%}
 .detailgrid,.cards2,.cards3,.softwaregrid,.langgrid{grid-template-columns:1fr}.opcols{grid-template-columns:1fr}.topbar{grid-template-columns:auto 1fr}.brand{justify-self:end}.actions{grid-column:1/-1;justify-self:center}
}
@media print{
 .topbar,.sidebar,.footerbar{display:none!important}.pagewrap{display:block;padding:0}.content{border:0;box-shadow:none}.qrblock{display:none}
 body{background:#fff}.content{page-break-after:always}.main{width:100%}
}


.examples-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:18px;
  margin:18px 0 24px;
  align-items:stretch;
}
.example-card{
  border:1px solid var(--line);
  border-radius:15px;
  padding:20px;
  background:#fff;
  min-width:0;
  box-shadow:0 3px 12px rgba(9,44,82,.04);
}
.example-card h3{
  margin:0 0 10px;
  color:var(--navy2);
  font-size:23px;
  line-height:1.5;
}
.example-card p{
  margin:0;
  font-size:17px;
  line-height:2;
}
.example-icon{
  width:54px;
  height:54px;
  border-radius:14px;
  display:grid;
  place-items:center;
  background:#edf5fc;
  font-size:29px;
  margin-bottom:12px;
}
.footerbar{
  clear:both;
  width:100%;
}
@media(max-width:850px){
  .examples-grid{grid-template-columns:1fr}
}

.course-back{
  color:#fff;
  border:1px solid #ffffff55;
  background:#ffffff10;
  border-radius:9px;
  padding:8px 12px;
  text-decoration:none;
  font-weight:700;
}