/* ============ منصة التدريب — التصميم العام ============ */
*,*::before,*::after{box-sizing:border-box}
:root{
  --page:#eef2f7; --panel:#fff; --ink:#0f172a; --muted:#5b6b82;
  --line:#e2e8f0; --brand:#4f46e5; --brand2:#0ea5e9;
  --ok:#15803d; --ok-bg:#dcfce7; --warn:#b45309; --warn-bg:#fef3c7;
  --err:#b91c1c; --err-bg:#fee2e2; --info-bg:#e0f2fe; --info:#0369a1;
  --r:14px; --r-sm:9px;
  --shadow:0 8px 26px rgba(15,23,42,.07);
  --shadow-lg:0 18px 50px rgba(15,23,42,.13);
  --mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;
}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--page);color:var(--ink);line-height:1.8;
  font-family:"Segoe UI","Noto Kufi Arabic",Tahoma,system-ui,-apple-system,sans-serif;
  font-size:15.5px;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.4;margin:0 0 .5em}
code,kbd{font-family:var(--mono);font-size:.92em;background:#f1f5f9;border:1px solid var(--line);border-radius:6px;padding:1px 6px;direction:ltr;display:inline-block}
pre{background:#0f172a;color:#e2e8f0;border-radius:var(--r-sm);padding:14px 16px;overflow:auto;direction:ltr;text-align:left;font-family:var(--mono);font-size:13px;line-height:1.7}
hr{border:0;border-top:1px solid var(--line);margin:22px 0}

.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
.wrap-sm{max-width:780px;margin:0 auto;padding:0 18px}
.section{padding:36px 0}
.section-title{font-size:24px;margin:0 0 6px}
.section-sub{color:var(--muted);margin:0 0 22px}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.between{display:flex;gap:12px;flex-wrap:wrap;align-items:center;justify-content:space-between}
.muted{color:var(--muted)}
.small{font-size:13.5px}
.center{text-align:center}
.mt{margin-top:18px}.mb{margin-bottom:18px}.mt-s{margin-top:8px}.mb-s{margin-bottom:8px}

.topbar{background:#0f172a;color:#e2e8f0;position:sticky;top:0;z-index:50}
.topbar .wrap{display:flex;align-items:center;gap:18px;min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:17px}
.brand:hover{text-decoration:none}
.brand .logo{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;font-size:17px}
.nav{display:flex;gap:4px;flex-wrap:wrap;margin-inline-start:auto;align-items:center}
.nav a{color:#cbd5e1;padding:8px 12px;border-radius:9px;font-size:14.5px;font-weight:600}
.nav a:hover{background:#1e293b;color:#fff;text-decoration:none}
.nav a.active{background:#1e293b;color:#fff}
.nav form{margin:0;display:inline}
.nav .linkish{background:none;border:0;color:#cbd5e1;font:inherit;cursor:pointer;padding:8px 12px;border-radius:9px;font-weight:600}
.nav .linkish:hover{background:#1e293b;color:#fff}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:inherit;font-size:15px;font-weight:700;cursor:pointer;
  border:1px solid transparent;border-radius:var(--r-sm);padding:10px 18px;
  transition:.15s;text-decoration:none;line-height:1.5;
}
.btn:hover{text-decoration:none;filter:brightness(1.06)}
.btn:active{transform:translateY(1px)}
.btn-p{background:var(--brand);color:#fff}
.btn-s{background:#f1f5f9;color:#334155;border-color:var(--line)}
.btn-d{background:#fee2e2;color:#b91c1c;border-color:#fecaca}
.btn-ok{background:#15803d;color:#fff}
.btn-w{background:#f59e0b;color:#3b2600}
.btn-sm{padding:6px 12px;font-size:13.5px;border-radius:8px}
.btn-lg{padding:13px 26px;font-size:16.5px}
.btn-block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed}

.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:20px}
.card-pad-lg{padding:26px}
.card h3{margin-top:0}
.card .ico{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-size:21px;background:linear-gradient(135deg,#eef2ff,#e0f2fe);margin-bottom:10px}

.alert{border-radius:var(--r-sm);padding:12px 16px;margin-bottom:12px;border:1px solid;font-size:14.5px;font-weight:600}
.alert-success{background:var(--ok-bg);border-color:#86efac;color:var(--ok)}
.alert-error{background:var(--err-bg);border-color:#fecaca;color:var(--err)}
.alert-warn{background:var(--warn-bg);border-color:#fcd34d;color:var(--warn)}
.alert-info{background:var(--info-bg);border-color:#bae6fd;color:var(--info)}
.flashbox{max-width:1180px;margin:14px auto 0;padding:0 18px}

.badge{display:inline-block;font-size:12.5px;font-weight:700;border-radius:999px;padding:3px 11px;border:1px solid;white-space:nowrap}
.b-gray{background:#f1f5f9;border-color:var(--line);color:#475569}
.b-ok{background:var(--ok-bg);border-color:#86efac;color:var(--ok)}
.b-warn{background:var(--warn-bg);border-color:#fcd34d;color:var(--warn)}
.b-err{background:var(--err-bg);border-color:#fecaca;color:var(--err)}
.b-info{background:var(--info-bg);border-color:#bae6fd;color:var(--info)}
.b-brand{background:#eef2ff;border-color:#c7d2fe;color:#3730a3}

.field{margin-bottom:16px}
.field > label,.lbl{display:block;font-size:14px;font-weight:700;margin-bottom:6px;color:#334155}
.in,.sel,.ta{
  display:block;width:100%;font-family:inherit;font-size:15px;color:var(--ink);
  padding:11px 13px;background:#fff;border:1px solid #cbd5e1;border-radius:var(--r-sm);transition:.15s;
}
.in:focus,.sel:focus,.ta:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.16)}
.ta{min-height:110px;resize:vertical}
.in[readonly]{background:#f8fafc;color:var(--muted)}
.hint{font-size:13px;color:var(--muted);margin-top:5px}
.check{display:flex;align-items:center;gap:9px;font-size:14.5px;color:#334155;cursor:pointer}
.check input{width:17px;height:17px;accent-color:var(--brand);cursor:pointer}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
@media(max-width:640px){.form-grid{grid-template-columns:1fr}}

.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff;box-shadow:var(--shadow)}
table.tbl{width:100%;border-collapse:collapse;font-size:14.5px;min-width:560px}
table.tbl th,table.tbl td{padding:11px 13px;text-align:right;border-bottom:1px solid var(--line);vertical-align:middle}
table.tbl th{background:#f8fafc;font-weight:800;font-size:13.5px;color:#334155;white-space:nowrap}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tbody tr:hover{background:#f8fafc}
table.tbl td.num{font-family:var(--mono);direction:ltr;text-align:center}
.empty{text-align:center;color:var(--muted);padding:28px}

/* محتوى الشرح */
.prose{font-size:15.5px;line-height:1.95;word-wrap:break-word}
.prose h2{font-size:21px;margin:26px 0 10px;padding-inline-start:12px;border-inline-start:4px solid var(--brand)}
.prose h3{font-size:18px;margin:20px 0 8px;color:#1e293b}
.prose ul,.prose ol{padding-inline-start:22px}
.prose li{margin-bottom:7px}
.prose table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14.5px}
.prose table th,.prose table td{border:1px solid var(--line);padding:9px 12px;text-align:right}
.prose table th{background:#f1f5f9}
.prose blockquote{margin:14px 0;padding:12px 16px;background:#f8fafc;border-inline-start:4px solid var(--brand2);border-radius:0 var(--r-sm) var(--r-sm) 0;color:#334155}
.prose img{border-radius:var(--r-sm)}

/* الترويسة العامة */
.hero{background:linear-gradient(135deg,#1e1b4b 0%,#4f46e5 55%,#0ea5e9 100%);color:#fff;padding:56px 20px 64px;text-align:center}
.hero h1{font-size:clamp(26px,4.4vw,42px);margin:14px 0 10px}
.hero p{max-width:800px;margin:0 auto;color:#e0e7ff;font-size:17px}
.hero .chip{display:inline-block;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.35);padding:5px 15px;border-radius:999px;font-size:14px}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.hero-cta .btn-s{background:rgba(255,255,255,.18);color:#fff;border-color:rgba(255,255,255,.4)}

/* إحصاءات */
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow);text-align:center}
.stat b{display:block;font-size:28px;font-family:var(--mono);direction:ltr;color:var(--brand)}
.stat span{font-size:13.5px;color:var(--muted);font-weight:600}

/* هيكل التطبيق: شريط جانبي */
.shell{display:grid;grid-template-columns:250px 1fr;gap:22px;max-width:1220px;margin:24px auto;padding:0 18px;align-items:start}
.side{background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:14px;position:sticky;top:76px}
.side .who{padding:10px;border-radius:var(--r-sm);background:#f8fafc;margin-bottom:12px}
.side .who b{display:block;font-size:15px}
.side a{display:flex;align-items:center;gap:9px;padding:9px 12px;border-radius:9px;color:#334155;font-weight:600;font-size:14.5px}
.side a:hover{background:#f1f5f9;text-decoration:none}
.side a.active{background:#eef2ff;color:#3730a3}
.side .sep{height:1px;background:var(--line);margin:10px 4px}
.side .grp{font-size:12px;font-weight:800;color:var(--muted);padding:8px 12px 4px}
.page-head{display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-bottom:18px}
.page-head h1{font-size:23px;margin:0}
.crumbs{font-size:13.5px;color:var(--muted);margin-bottom:6px}

/* بطاقات الدروس */
.lesson-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;display:flex;flex-direction:column;gap:8px;transition:.18s}
.lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:#c7d2fe}
.lesson-card .unit{font-family:var(--mono);font-size:12.5px;color:#4338ca;background:#eef2ff;border:1px solid #c7d2fe;border-radius:999px;padding:2px 10px;align-self:flex-start}
.lesson-card h3{font-size:17px;margin:0}
.lesson-card p{margin:0;color:var(--muted);font-size:14px}
.lesson-card .foot{margin-top:auto;display:flex;gap:8px;align-items:center;justify-content:space-between;flex-wrap:wrap}

/* شريط التقدم */
.progress{height:11px;background:#e2e8f0;border-radius:999px;overflow:hidden}
.progress > i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));border-radius:999px;transition:width .4s}

/* محرّر التطبيق العملي (بنمط w3schools) */
.editor{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;box-shadow:var(--shadow)}
.editor-tabs{display:flex;background:#0f172a;gap:2px;padding:6px 6px 0;flex-wrap:wrap;align-items:center}
.editor-tabs button{
  font-family:inherit;font-size:14px;font-weight:700;cursor:pointer;border:0;border-radius:8px 8px 0 0;
  background:#1e293b;color:#94a3b8;padding:9px 18px;
}
.editor-tabs button.active{background:#f8fafc;color:#0f172a}
.editor-tabs .spacer{margin-inline-start:auto;display:flex;gap:6px;padding-bottom:6px}
.editor-tabs .tbtn{background:#334155;color:#e2e8f0;border-radius:8px;font-size:13px;padding:6px 12px}
.editor-tabs .tbtn:hover{background:#475569}
.editor-body{display:grid;grid-template-columns:1fr 1fr;min-height:430px}
.editor-panes{position:relative;background:#f8fafc;border-inline-end:1px solid var(--line)}
.editor-pane{display:none;height:100%}
.editor-pane.active{display:block}
.editor-pane textarea{
  width:100%;height:100%;min-height:430px;border:0;outline:none;resize:none;
  font-family:var(--mono);font-size:13.5px;line-height:1.75;padding:14px;direction:ltr;text-align:left;
  background:#f8fafc;color:#0f172a;tab-size:2;
}
.editor-preview{background:#fff;display:flex;flex-direction:column}
.editor-preview .bar{font-size:12.5px;color:var(--muted);padding:7px 12px;border-bottom:1px solid var(--line);background:#f8fafc;font-weight:700}
.editor-preview iframe{flex:1;width:100%;border:0;min-height:400px;background:#fff}
@media(max-width:900px){.editor-body{grid-template-columns:1fr}.editor-pane textarea{min-height:260px}}

/* تفاصيل */
.kv{display:grid;grid-template-columns:150px 1fr;gap:6px 14px;font-size:14.5px}
.kv dt{color:var(--muted);font-weight:700}
.kv dd{margin:0}

/* دفتر الدرجات */
.gb table.tbl{min-width:900px}
.gb th.rot{max-width:64px;white-space:normal;font-size:12px;line-height:1.35}
.gb td.pass{background:#f0fdf4}
.gb td.low{background:#fef2f2}
.gb td.none{color:#94a3b8}

/* الفوتر */
footer.site{background:#0f172a;color:#94a3b8;padding:30px 0;margin-top:40px;font-size:14px}
footer.site a{color:#cbd5e1}

/* الطباعة */
@media print{
  body{background:#fff;font-size:12px}
  .no-print{display:none!important}
  .topbar,.side,footer.site,.flashbox{display:none!important}
  .shell{display:block;margin:0;padding:0;max-width:none}
  table.tbl th,table.tbl td{border:1px solid #94a3b8;padding:4px 5px;font-size:10.5px}
  .table-wrap{border:0;box-shadow:none}
  .print-head{display:block!important;text-align:center;margin-bottom:14px}
  @page{size:A4 landscape;margin:10mm}
}
.print-head{display:none}

@media(max-width:900px){
  .shell{grid-template-columns:1fr}
  .side{position:static}
}