:root{--navy:#0a3264;--navy2:#104e89;--blue:#1768ad;--green:#18804f;--gold:#b67b16;--red:#a43b3b;--ink:#23313d;--muted:#687b8d;--line:#d8e3ee;--bg:#f4f7fa;--white:#fff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);font-family:"Segoe UI",Tahoma,Arial,sans-serif;color:var(--ink);direction:rtl}
a{text-decoration:none;color:inherit}.topbar{min-height:66px;background:linear-gradient(90deg,#082a55,#0f4d88);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:10px 22px;box-shadow:0 3px 14px #0002;position:sticky;top:0;z-index:30}
.brand{font-size:20px;font-weight:800}.actions{display:flex;gap:8px;flex-wrap:wrap}.actions a,.actions button{color:#fff;background:#ffffff0d;border:1px solid #ffffff55;border-radius:9px;padding:8px 12px;font:inherit}
.pagewrap{max-width:1450px;margin:auto;padding:20px;display:grid;grid-template-columns:310px minmax(0,1fr);gap:20px}
.sidebar{background:#fff;border:1px solid var(--line);border-radius:16px;padding:15px;align-self:start;position:sticky;top:88px;box-shadow:0 4px 15px rgba(10,45,80,.05)}
.sidebar h2{font-size:20px;color:var(--navy);margin:3px 5px 14px}.navitem{display:grid;grid-template-columns:42px 1fr;gap:9px;align-items:center;padding:10px 11px;margin:6px 0;border-radius:10px;border:1px solid #e1e8ef;color:#455869}
.navitem:hover{background:#f4f8fc}.navitem.active{background:linear-gradient(90deg,#0c5bae,#0a3f80);color:#fff;border-color:#0c5bae;font-weight:800}.navicon{width:37px;height:37px;border-radius:9px;background:#edf5fb;color:var(--blue);display:grid;place-items:center;font-weight:900}.active .navicon{background:#ffffff17;color:#fff}
.main{min-width:0}.content{background:#fff;border:1px solid var(--line);border-radius:18px;padding:27px;box-shadow:0 4px 15px rgba(10,45,80,.05)}
.hero{border-radius:18px;background:linear-gradient(135deg,#edf6fc,#f8fbfd);border:1px solid #d6e6ef;padding:25px;display:grid;grid-template-columns:1fr 180px;gap:20px;align-items:center}
.hero h1{margin:0;color:var(--navy);font-size:35px}.hero p{margin:8px 0 0;color:var(--muted);line-height:1.9;font-size:17px}.baseorb{width:145px;height:145px;border-radius:50%;background:#0d315a;color:#fff;display:grid;place-items:center;text-align:center;margin:auto;box-shadow:0 15px 28px #0a326422}.baseorb b{font-size:42px;display:block}.baseorb small{opacity:.8}
.title{margin:26px 0 13px;color:var(--navy);font-size:24px;font-weight:900;display:flex;align-items:center;gap:10px}.title:after{content:"";height:2px;background:#dce6ef;flex:1}
.info-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.info{border:1px solid var(--line);border-radius:14px;padding:17px;background:#fff}.info h3{margin:0 0 7px;color:var(--navy2);font-size:18px}.info p{margin:0;color:#526779;line-height:1.8}
.digits{direction:ltr;font-family:Consolas,monospace;font-size:18px;background:#f5f8fb;border:1px solid #e2eaf1;border-radius:10px;padding:12px;text-align:center;word-spacing:8px}
.note{background:#f3faf6;border-right:4px solid var(--green);padding:15px 17px;border-radius:11px;line-height:1.9;color:#40574a}
.warn{background:#fff8ef;border-right-color:var(--gold);color:#665126}.example-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.example{border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff}.example h3{margin:0 0 8px;color:var(--navy2);font-size:19px}.example p{margin:0 0 8px;line-height:1.8;color:#536779}.math{direction:ltr;text-align:left;font-family:Consolas,"Courier New",monospace;font-size:16px;white-space:pre-line;background:#f7fafc;border:1px dashed #bfd0df;border-radius:10px;padding:12px 14px;line-height:1.8}
.map{width:100%;border-collapse:collapse;font-size:15px}.map th,.map td{border:1px solid #dbe5ee;padding:9px;text-align:center}.map th{background:#edf5fb;color:var(--navy)}
.op-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.op-card{border:1px solid var(--line);border-radius:14px;padding:17px}.op-card h3{margin:0 0 8px;color:var(--navy2)}
.footerbar{margin-top:24px;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}.footerbar a{background:var(--navy);color:#fff;padding:9px 15px;border-radius:9px}
.system-cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.system-card{border:1px solid var(--line);border-radius:16px;padding:20px;background:#fff;text-align:center;transition:.15s}.system-card:hover{transform:translateY(-2px);box-shadow:0 8px 20px #0a326414}.system-card .big{font-size:35px;font-weight:900;color:var(--navy)}.system-card h3{color:var(--navy2);margin:7px 0}.system-card p{color:var(--muted);line-height:1.7;font-size:14px}.open{display:inline-block;margin-top:8px;background:var(--navy);color:#fff;padding:8px 12px;border-radius:9px;font-weight:800}
@media(max-width:1050px){.info-grid{grid-template-columns:1fr 1fr}.system-cards{grid-template-columns:1fr 1fr}.hero{grid-template-columns:1fr}.example-grid,.op-grid{grid-template-columns:1fr}}
@media(max-width:850px){.pagewrap{grid-template-columns:1fr}.sidebar{position:static}.info-grid,.system-cards{grid-template-columns:1fr}}
@media print{.topbar,.sidebar,.footerbar{display:none!important}.pagewrap{display:block;padding:0}.content{border:0;box-shadow:none}.example,.info,.op-card{break-inside:avoid}}

.hero-figure{width:100%;max-width:250px;height:auto;margin:auto;display:block}
.visual-block{margin:16px 0 22px;background:#f8fbfd;border:1px solid #d7e5ef;border-radius:16px;padding:14px;text-align:center}
.visual-block img{width:min(100%,700px);height:auto;display:block;margin:auto}
.video-card{margin:15px 0;background:#f5faf7;border:1px solid #cfe5d7;border-right:5px solid var(--green);border-radius:14px;padding:14px;display:grid;grid-template-columns:95px 1fr;gap:15px;align-items:center}
.video-card img{width:90px;height:90px;background:#fff;border:5px solid #fff;border-radius:10px}
.video-card h4{margin:0 0 5px;color:var(--navy);font-size:18px}.video-card p{margin:0 0 8px;color:#5d6e66;line-height:1.7}.video-card a{display:inline-block;background:var(--green);color:#fff;padding:7px 12px;border-radius:8px;font-weight:800}
@media(max-width:650px){.video-card{grid-template-columns:1fr;text-align:center}.video-card img{margin:auto}}

.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}

/* Unit exercises */
.content .example p[dir="ltr"]{
  direction:ltr;text-align:center;font-family:Consolas,"Courier New",monospace;
  font-size:18px;font-weight:700;background:#f7fafc;border:1px solid #e1e9ef;
  border-radius:9px;padding:9px;margin:8px 0;
}
.content .example-grid{margin-bottom:18px}


:root{--navy:#0a3264;--navy2:#104e89;--blue:#1768ad;--green:#18804f;--gold:#b67b16;--red:#a43b3b;--bg:#f4f7fa;--line:#dce6ee}
.hero-copy{font-size:17px;line-height:2}
.definition-box{background:linear-gradient(135deg,#eef6fc,#f7fbf8);border:1px solid #cfe1ee;border-right:6px solid var(--green);border-radius:18px;padding:24px;margin:18px 0}
.definition-box h2{margin:0 0 8px;color:var(--navy)}
.definition-box p{font-size:18px;line-height:2;margin:0}
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:16px 0}
.info-card{background:#fff;border:1px solid var(--line);border-radius:15px;padding:18px}
.info-card h3{margin:0 0 8px;color:var(--navy)}.info-card p{line-height:1.9;margin:0}
.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:18px 0}
.timeline>div{background:white;border:1px solid var(--line);border-radius:14px;padding:15px;text-align:center}
.timeline b{display:block;color:var(--navy);margin-top:7px}
.ipo{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0}
.ipo>div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}
.ipo h3{margin-top:0;color:var(--navy)}.ipo .in{border-top:5px solid var(--blue)}.ipo .pro{border-top:5px solid var(--gold)}.ipo .out{border-top:5px solid var(--green)}
.lesson-card{background:#fff;border:1px solid var(--line);border-radius:17px;margin:18px 0;overflow:hidden}
.lesson-head{background:#f0f6fa;border-bottom:1px solid var(--line);padding:15px 18px;font-weight:900;color:var(--navy);font-size:18px}
.lesson-body{padding:18px}
.steps{counter-reset:st;list-style:none;padding:0;margin:12px 0}
.steps li{counter-increment:st;position:relative;padding:10px 50px 10px 12px;margin:7px 0;background:#f8fafc;border-radius:10px;border:1px solid #e4ebf0;line-height:1.8}
.steps li:before{content:counter(st);position:absolute;right:10px;top:9px;width:28px;height:28px;border-radius:50%;background:var(--navy);color:white;display:grid;place-items:center;font-weight:900}
.trace{width:100%;border-collapse:collapse;margin:12px 0}.trace th,.trace td{border:1px solid #dbe5ee;padding:10px;text-align:center}.trace th{background:#edf5fb;color:var(--navy)}
details.solution{margin-top:12px;border:1px solid #cfe3d7;background:#f7fcf9;border-radius:12px;padding:12px 15px}details.solution summary{cursor:pointer;font-weight:900;color:var(--green)}
.practice{border:2px dashed #9bb7ca;border-radius:15px;padding:18px;margin:16px 0;background:#fbfdff}
.flow-svg{display:block;width:100%;max-width:820px;height:auto;margin:18px auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px}
.flow-note{background:#f6fafc;border-right:4px solid var(--blue);border-radius:10px;padding:13px 15px;line-height:1.9;margin:14px 0}
.source-figure{background:#fff;border:1px solid var(--line);border-radius:17px;padding:18px;margin:18px 0}
.source-figure h3{color:var(--navy);margin-top:0}
.badge{display:inline-block;border-radius:999px;padding:5px 10px;background:#eaf4fb;color:#145b91;font-size:12px;font-weight:800}
.warn{background:#fff8e8;border-right:4px solid var(--gold);padding:14px;border-radius:10px}
@media(max-width:900px){.info-grid,.timeline,.ipo{grid-template-columns:1fr}}

.flow-types-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:18px 0}
.flow-type-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}
.flow-type-card h3{margin:0 0 8px;color:var(--navy)}
.flow-type-card p{line-height:1.9}
.flow-type-card a{display:inline-block;margin-top:8px;font-weight:800;color:var(--blue)}
.arrow-demo{display:flex;align-items:center;justify-content:center;gap:14px;margin:18px 0;padding:14px;background:#fbfdff;border:1px solid var(--line);border-radius:14px}
.arrow-demo .shaft{width:170px;height:4px;background:var(--navy);position:relative}
.arrow-demo .shaft:after{content:"";position:absolute;left:-2px;top:-7px;border-top:9px solid transparent;border-bottom:9px solid transparent;border-right:16px solid var(--navy)}
.arrow-demo b{color:var(--navy)}
svg .label-bg{fill:#fff}
@media(max-width:850px){.flow-types-grid{grid-template-columns:1fr}}

.solved-pair{display:grid;grid-template-columns:1fr 1.15fr;gap:18px;align-items:start;margin:18px 0}
.solved-pair .algo-side,.solved-pair .flow-side{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px}
.solved-pair h3{margin-top:0;color:var(--navy)}
.loop-symbol{width:165px;height:72px;margin:auto;display:grid;place-items:center;
  background:#fff;border:4px solid var(--red);
  clip-path:polygon(20% 0,80% 0,100% 50%,80% 100%,20% 100%,0 50%);
  font-weight:900;color:var(--navy)}
@media(max-width:900px){.solved-pair{grid-template-columns:1fr}}

/* v15: الطباعة لا تغيّر تكبير صفحة الموقع */
@media print {
  html, body { transform: none !important; }
}
.domain-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:18px 0}.domain{border:1px solid var(--line);border-radius:16px;padding:18px;background:#fff}.domain .emoji{font-size:32px}.domain h3{color:var(--navy);margin:7px 0}.domain p{line-height:1.85;color:#526779;margin:0}.compare-strip{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;margin:18px 0}.compare-box{border:1px solid var(--line);border-radius:16px;padding:20px;background:#fff}.compare-box h3{color:var(--navy);margin-top:0}.vs{font-size:24px;font-weight:900;color:var(--gold)}.scenario{border:1px solid var(--line);border-radius:14px;padding:16px;margin:12px 0;background:#fbfdff}.scenario b{color:var(--navy)}.mini-flow{display:flex;gap:8px;align-items:center;justify-content:center;flex-wrap:wrap;margin:20px 0}.mini-flow span{padding:12px 16px;border:1px solid var(--line);border-radius:12px;background:#fff;font-weight:800;color:var(--navy)}.mini-flow i{font-style:normal;color:var(--green);font-size:22px}@media(max-width:900px){.domain-grid{grid-template-columns:1fr}.compare-strip{grid-template-columns:1fr}.vs{text-align:center}}

.solution{border:1px solid #b9d9c8;border-right:5px solid var(--green);border-radius:14px;padding:17px 19px;margin:10px 0 20px;background:#f5fbf7}.solution h3{color:var(--green);margin:0 0 8px}.solution p{line-height:1.9;margin:7px 0}.muted{color:#657786;font-size:.94em}

.grid2,.grid3{display:grid;gap:14px;margin:16px 0}.grid2{grid-template-columns:repeat(2,1fr)}.grid3{grid-template-columns:repeat(3,1fr)}.card,.example,.solved,.question{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin:14px 0}.steps{display:grid;gap:12px}.steps>div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}.steps b{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--navy);color:#fff}.process-diagram{text-align:center;max-width:760px;margin:18px auto}.process-diagram>div{padding:14px;border:1px solid var(--line);border-radius:12px;background:#fff}.process-diagram .decision{background:#fff8e8;border-color:#e5c77d}.branches{display:grid!important;grid-template-columns:1fr 1fr;gap:14px;margin-top:12px}.compare{display:grid;grid-template-columns:1fr 1fr;gap:16px}.alg,pre{background:#f6f9fc;border:1px solid #dce6ef;border-radius:12px;padding:16px;line-height:2;white-space:pre-wrap;font-family:inherit}table{width:100%;border-collapse:collapse}th,td{border:1px solid #dce6ef;padding:10px;text-align:center}.check{line-height:2.1}.question h3,.solved h2{color:var(--navy)}@media(max-width:800px){.grid2,.grid3,.compare,.branches{grid-template-columns:1fr}}

/* v24 refinements */
.icon-card{text-align:center}.icon-card .ico{font-size:38px;margin-bottom:8px}.stage-flow{max-width:760px;margin:20px auto;display:flex;flex-direction:column;align-items:stretch;gap:7px}.stage-flow>div{border:1px solid var(--line);border-right:6px solid var(--blue);border-radius:14px;padding:15px 18px;background:#fff;display:grid;grid-template-columns:42px 1fr;column-gap:10px;align-items:center}.stage-flow>div>span{grid-row:1/3;width:34px;height:34px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:900}.stage-flow b{color:var(--navy);font-size:18px}.stage-flow small{color:#5d7181;line-height:1.7}.stage-flow i{text-align:center;font-style:normal;font-size:23px;color:var(--green);font-weight:900}.question-strip{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:16px 0}.question-strip span{background:#f7fafc;border:1px solid var(--line);border-radius:12px;padding:14px;font-weight:800;color:var(--navy)}.model-example{border:1px solid var(--line);border-radius:17px;padding:18px;background:#fbfdff}.model-problem,.model-conclusion{padding:13px 15px;border-radius:12px;background:#eef6fc}.model-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:14px 0}.model-row>div{border:1px solid var(--line);border-radius:12px;padding:15px;background:#fff}.model-row b,.model-conclusion b{color:var(--navy)}.rules-vertical{max-width:800px;margin:22px auto}.rule{display:grid;grid-template-columns:76px 1fr;gap:16px;align-items:center;border:1px solid var(--line);border-radius:16px;padding:18px;background:#fff;box-shadow:0 4px 14px #0a32640a}.rule-icon{width:60px;height:60px;border-radius:16px;background:#edf5fb;display:grid;place-items:center;font-size:30px}.rule b{font-size:19px;color:var(--navy)}.rule p{margin:6px 0 0;line-height:1.85;color:#526779}.rule-arrow{text-align:center;font-size:24px;color:var(--green);font-weight:900;margin:4px 0}.source-figure .flow-svg{max-width:900px}@media(max-width:800px){.question-strip,.model-row{grid-template-columns:1fr}.rule{grid-template-columns:58px 1fr}.rule-icon{width:50px;height:50px;font-size:25px}}

/* unit5 */
.concept-flow{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;margin:22px 0}.concept-flow .node{min-width:150px;padding:16px;border:1px solid var(--line);border-radius:14px;background:#fff;text-align:center;font-weight:800;color:var(--navy)}.concept-flow .arrow{font-size:25px;color:var(--green);font-weight:900}.tree{max-width:850px;margin:20px auto;text-align:center}.tree .root,.tree .child,.tree .leaf{border:1px solid var(--line);border-radius:14px;padding:14px;background:#fff}.tree .root{background:#edf5fb;color:var(--navy);font-weight:900}.tree .row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px;position:relative}.tree .child{border-top:4px solid var(--blue)}.tree .leaf{margin-top:10px;background:#fafcfe;font-size:14px}.symbol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.symbol{border:1px solid var(--line);border-radius:14px;padding:16px;text-align:center}.shape{height:70px;display:grid;place-items:center;margin-bottom:8px}.oval{width:120px;height:50px;border:3px solid var(--navy);border-radius:50%}.rect{width:130px;height:52px;border:3px solid var(--blue)}.para{width:130px;height:52px;border:3px solid var(--green);transform:skew(-15deg)}.diamond{width:58px;height:58px;border:3px solid var(--gold);transform:rotate(45deg)}.circle{width:50px;height:50px;border:3px solid var(--navy);border-radius:50%}.flow-demo{max-width:720px;margin:18px auto;display:flex;flex-direction:column;align-items:center;gap:8px}.flow-demo .box{min-width:280px;padding:12px 18px;border:2px solid var(--blue);border-radius:10px;text-align:center;background:#fff}.flow-demo .round{border-radius:30px;border-color:var(--navy)}.flow-demo .decision2{width:180px;padding:25px 10px;border:2px solid var(--gold);transform:skew(-8deg);text-align:center;background:#fff}.flow-demo .arr{font-size:23px;color:var(--green)}.codebox{direction:ltr;text-align:left;background:#f6f9fc;border:1px solid #dce6ef;border-radius:12px;padding:16px;white-space:pre-wrap;font-family:Consolas,monospace;line-height:1.9}.lesson-goal{background:#eef6fc;border-right:5px solid var(--blue);padding:15px 18px;border-radius:12px;margin:16px 0}.pill{display:inline-block;padding:5px 10px;border-radius:20px;background:#edf5fb;color:var(--navy);font-weight:800;margin:3px}@media(max-width:800px){.tree .row,.symbol-grid{grid-template-columns:1fr}}

/* v26 refinements */
.mini-svg{display:block;width:100%;max-width:250px;height:190px;margin:10px auto;background:#fbfdff;border:1px solid var(--line);border-radius:12px}.mini-svg .ms{fill:#fff;stroke:#0a3264;stroke-width:2.5}.mini-svg .mp{fill:#fffaf0;stroke:#b67b16;stroke-width:2.5}.mini-svg .md{fill:#f5fbf7;stroke:#18804f;stroke-width:2.5}.mini-svg .ml{stroke:#0a3264;stroke-width:2.5;fill:none}.compare-table{margin:16px 0}.compare-table th{background:#edf5fb;color:var(--navy)}.compare-table td:first-child{font-weight:800;color:var(--navy)}.mini-code{margin-top:12px;background:#f6f9fc;border:1px solid var(--line);border-radius:10px;padding:11px;font-weight:800;color:var(--navy);text-align:center}.flow-side .flow-svg{margin:0 auto}.algo-side ol{line-height:2}.flow-type-card .mini-svg{min-height:190px}
/* v27: steps before diagrams */
.lesson-card + .flow-svg{margin-top:14px}.lesson-card .info-grid{margin-bottom:0}

/* Approved solved-example layout: steps on right, flowchart on left */
.solved-pair{direction:rtl;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr)}
.solved-pair>.algo-side{grid-column:1}
.solved-pair>.flow-side{grid-column:2}
@media(max-width:900px){.solved-pair>.algo-side,.solved-pair>.flow-side{grid-column:auto}.solved-pair>.algo-side{order:1}.solved-pair>.flow-side{order:2}}