:root{
    --blue-d:#1a3a5c; --blue-m:#2c5f8a; --blue-l:#daeaf7;
    --green-d:#1a5c2a; --green-l:#e4f6e9;
    --org-d:#7a3a00; --org-l:#fff3d6;
    --red-d:#a01818; --red-l:#fde8e8;
    --purple-d:#4a0070; --purple-l:#f3e6ff;
    --gray-l:#f5f6f8; --gray-d:#2b2b2b; --line:#dbe1e8;
  }
  *{box-sizing:border-box;}
  body{margin:0; font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
    color:var(--gray-d); background:#eef1f5; line-height:1.6;
    -webkit-user-select:none; -moz-user-select:none; -ms-user-select:none; user-select:none;
    -webkit-touch-callout:none;}
  /* Τα πεδία απαντήσεων παραμένουν λειτουργικά */
  input, textarea{ -webkit-user-select:text; -moz-user-select:text; -ms-user-select:text; user-select:text; }
  .byline{text-align:left; font-size:15px; line-height:1.35; color:#dbe9f7; margin:0 0 11px;
    padding-bottom:9px; border-bottom:1px solid rgba(255,255,255,.18); letter-spacing:.2px;}
  .byline b{color:#fff; font-size:16px;}
  .watermark{position:fixed; bottom:8px; right:10px; z-index:60; font-size:11px; color:rgba(26,58,92,.55);
    background:rgba(255,255,255,.6); border:1px solid rgba(26,58,92,.15); border-radius:6px; padding:3px 8px; pointer-events:none;}
  @media print{ body{display:none!important;} }
  .ex.exo{border-left:4px solid var(--green-d);}
  .tag.open{background:var(--green-l); color:var(--green-d);}
  .osolbox{display:none; margin-top:12px; padding:14px 16px; background:var(--green-l);
    border:1px solid var(--green-d); border-left:4px solid var(--green-d); border-radius:8px; line-height:1.7;}
  .osolbox.show{display:block;}
  .osolbox .osol-lbl{font-weight:700; color:var(--green-d); font-size:12.5px;
    text-transform:uppercase; letter-spacing:.4px; margin-bottom:8px;}
  .osolbox ul{margin:6px 0 6px 18px;} .osolbox li{margin:4px 0;}
  .osolbox svg{max-width:100%; height:auto; display:block; margin:10px auto; background:#fff;
    border:1px solid rgba(26,92,42,.25); border-radius:8px;}
  .osolbox table{width:100%; border-collapse:collapse; margin:10px 0; background:#fff;}
  .osolbox th,.osolbox td{border:1px solid #cfd8e0; padding:5px 8px; font-size:13px; text-align:center;}
  .osolbox th{background:#eef4f8; color:var(--blue-d);}
  .wrap{max-width:920px; margin:0 auto; padding:0 16px 80px;}
  /* Η επικεφαλίδα ΔΕΝ είναι κολλημένη: κολλάει μόνο η μπάρα καρτελών (αλλιώς επικαλύπτονταν
     και έκλεβαν ~190px ύψος από τη σελίδα — ο διερμηνευτής έδειχνε «στριμωγμένος»). */
  header.top{background:var(--blue-d); color:#fff; padding:22px 16px 22px 16px; text-align:center;
    position:relative; z-index:50; box-shadow:0 2px 8px rgba(0,0,0,.15);}
  header.top h1{margin:0; font-size:20px;}
  header.top p{margin:4px 0 0; font-size:13px; opacity:.85;}
  nav.chapters{display:flex; flex-wrap:wrap; gap:6px; justify-content:center; margin:16px 0;}
  nav.chapters button{border:1px solid var(--blue-m); background:#fff; color:var(--blue-m);
    width:38px; height:34px; border-radius:8px; cursor:pointer; font-size:13px; font-weight:600; transition:.15s;}
  nav.chapters button:hover{background:var(--blue-l);}
  nav.chapters button.active{background:var(--blue-d); color:#fff; border-color:var(--blue-d);}
  .lesson{display:none;}
  .lesson.show{display:block; animation:fade .3s;}
  @keyframes fade{from{opacity:0; transform:translateY(6px);} to{opacity:1; transform:none;}}
  .lh{background:var(--blue-d); color:#fff; padding:14px 18px; border-radius:10px 10px 0 0; margin-top:10px;}
  .lh .no{font-size:12px; opacity:.85; letter-spacing:.5px;}
  .lh .ti{font-size:19px; font-weight:700; margin-top:2px;}
  .lbody{background:#fff; padding:20px 24px; border-radius:0 0 10px 10px; box-shadow:0 1px 4px rgba(0,0,0,.08);}
  .src{font-size:12.5px; color:#294; background:#eef7ef; border-left:3px solid var(--green-d);
    padding:7px 11px; border-radius:4px; margin:0 0 16px;}
  h2.sec{color:var(--blue-d); font-size:17px; margin:22px 0 8px; border-bottom:2px solid var(--blue-l); padding-bottom:4px;}
  h3.sub{color:var(--blue-m); font-size:15px; margin:16px 0 6px;}
  ul.pts,ol.pts{margin:6px 0 12px; padding-left:24px;} ul.pts li,ol.pts li{margin:5px 0;}
  p{margin:8px 0;}
  .def{background:var(--blue-l); border:1.5px solid var(--blue-m); border-radius:8px; padding:10px 14px; margin:12px 0;}
  .def b{color:var(--blue-d);}
  .note{background:var(--org-l); border:1.5px solid #d08000; border-radius:8px; padding:10px 14px; margin:12px 0; color:var(--org-d); font-size:14px;}
  .note b{color:var(--org-d);}
  pre.code{background:#1e2733; color:#e6edf3; padding:12px 14px; border-radius:8px; overflow-x:auto;
    font-family:"SF Mono",Consolas,Monaco,monospace; font-size:12.5px; line-height:1.55; margin:12px 0;}
  svg.flow{max-width:100%; height:auto; display:block; margin:12px auto; background:#fff;
    border:1px solid var(--line); border-radius:8px;}
  .flowrow{display:flex; flex-wrap:wrap; gap:14px; justify-content:center; align-items:flex-start;}
  .flowrow svg.flow{flex:0 1 auto;}
  .figcap{text-align:center; font-size:12.5px; color:#5a6b7d; margin:-4px 0 14px;}
  svg.flow text{font-family:-apple-system,Segoe UI,Roboto,Arial,sans-serif;}
  table.tbl{border-collapse:collapse; width:100%; margin:12px 0; font-size:13.5px;}
  table.tbl th{background:var(--blue-d); color:#fff; padding:8px 10px; text-align:left;}
  table.tbl td{border:1px solid var(--line); padding:7px 10px; vertical-align:top;}
  table.tbl tr:nth-child(even) td{background:#f4f8fc;}
  .ex-head{background:var(--green-d); color:#fff; padding:10px 16px; border-radius:8px; font-weight:700; margin:26px 0 12px; font-size:16px;}
  .ex{background:var(--gray-l); border:1px solid var(--line); border-radius:10px; padding:16px 18px; margin:14px 0;}
  .ex .q{font-weight:600; margin-bottom:10px;}
  .ex .tag{display:inline-block; font-size:11px; font-weight:700; color:#fff; background:var(--blue-m); border-radius:5px; padding:2px 8px; margin-right:8px; vertical-align:middle;}
  .ex .tag.iep{background:var(--org-d);}
  .ex .qnum{display:inline-block; font-size:11px; font-weight:800; color:var(--blue-d); background:#e8eef5; border:1px solid #c3d2e2; border-radius:5px; padding:2px 8px; margin-right:8px; vertical-align:middle; letter-spacing:.2px;}
  .ex .tag.pan{background:var(--red-d);}
  /* ── Ασκήσεις ελεύθερου κειμένου (κώδικας) ── */
  .ex.exc{background:#fbfdff; border:1px solid var(--blue-m); border-left:5px solid var(--blue-m);}
  .exc .exhead{display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin-bottom:10px;}
  .exc .tag.code{background:var(--green-d);}
  .diff{display:inline-flex; align-items:center; gap:6px; font-size:11.5px; font-weight:700; border-radius:6px; padding:2px 9px; white-space:nowrap;}
  .diff .stars{letter-spacing:1px; font-size:12.5px;}
  .diff.d1{background:#e3f5e8; color:#1a6b33; border:1px solid #7fc99a;}
  .diff.d2{background:#e8f4dd; color:#3d6b18; border:1px solid #a8cc7f;}
  .diff.d3{background:#fdf3d9; color:#8a6209; border:1px solid #e0bd63;}
  .diff.d4{background:#fde9d9; color:#9c4b12; border:1px solid #e8a56d;}
  .diff.d5{background:#fbe1e1; color:#9c1c1c; border:1px solid #e08a8a;}
  .askfor{display:inline-block; font-size:11.5px; font-weight:700; border-radius:6px; padding:2px 9px; background:#eaf1fb; color:var(--blue-d); border:1px solid var(--blue-m);}
  .exc .body{font-weight:400; line-height:1.65; margin:2px 0 12px;}
  .exc .body b{color:var(--blue-d);}
  .exc .given{background:#fff; border:1px dashed var(--blue-m); border-radius:7px; padding:8px 12px; margin:10px 0; font-size:13.5px;}
  /* Πλαίσιο «Μεταβλητές που θα χρειαστείς» */
  .varsbox{background:#f3f8f4; border:1px solid #bfe0c9; border-left:4px solid #1a7d34; border-radius:8px; padding:9px 12px 10px; margin:10px 0;}
  .varsbox .varshd{font-size:12.5px; font-weight:700; color:#14602c; margin-bottom:7px;}
  table.varstab{border-collapse:collapse; width:100%; background:#fff;}
  table.varstab th,table.varstab td{border:1px solid #cfe3d6; padding:4px 9px; font-size:12.5px; text-align:left; vertical-align:top;}
  table.varstab th{background:#e4f2e9; color:#14602c; font-weight:700; white-space:nowrap;}
  table.varstab td.vt{font-family:"SF Mono",Consolas,Monaco,monospace; color:#7a3a00; font-weight:700; white-space:nowrap;}
  table.varstab td.vn{font-family:"SF Mono",Consolas,Monaco,monospace; color:#12263a; font-weight:700; white-space:nowrap;}
  .varsbox .varsnote{font-size:11.5px; color:#4d6b58; margin-top:6px; line-height:1.5;}
  .exp-body .varsbox{background:#f3f8f4; padding:7px 10px 8px;}
  .exc .btns{display:flex; flex-wrap:wrap; gap:8px; margin-top:6px;}
  .exc .btns button{border:none; border-radius:8px; padding:9px 14px; font-size:13.5px; font-weight:700; cursor:pointer; font-family:inherit;}
  .b-skel{background:var(--blue-m); color:#fff;}
  .b-hint{background:var(--org-l); color:var(--org-d); border:1.5px solid #d08000 !important;}
  .b-sol{background:var(--green-d); color:#fff;}
  .exc .btns button:hover{filter:brightness(1.08);}
  .hintbox{display:none; background:var(--org-l); border:1.5px solid #d08000; color:var(--org-d); border-radius:8px; padding:9px 13px; margin-top:10px; font-size:13.5px;}
  .hintbox.show{display:block;}
  .loadmsg{display:none; margin-top:10px; background:#e3f5e8; border:1.5px solid var(--green-d); color:#14532d; border-radius:8px; padding:8px 12px; font-size:13px; font-weight:600;}
  .loadmsg.show{display:block;}
  /* ── Μετακινούμενο παράθυρο εκφώνησης (πάνω από τον Διερμηνευτή) ── */
  .expanel{position:fixed; z-index:120; width:390px; max-width:calc(100vw - 24px);
    background:#fff; border:2px solid var(--blue-d); border-radius:12px;
    box-shadow:0 10px 34px rgba(0,0,0,.28); overflow:hidden; font-size:13.5px;}
  .exp-head{display:flex; align-items:center; gap:8px; background:var(--blue-d); color:#fff;
    padding:8px 10px; cursor:move; user-select:none; touch-action:none;}
  .exp-grip{opacity:.75; font-size:14px; letter-spacing:-2px;}
  .exp-title{flex:1; font-weight:700; font-size:12.5px; line-height:1.25; overflow:hidden;}
  .exp-btn{width:26px; height:24px; border:none; border-radius:6px; cursor:pointer;
    background:rgba(255,255,255,.18); color:#fff; font-weight:700; font-size:14px; line-height:1; font-family:inherit;}
  .exp-btn:hover{background:rgba(255,255,255,.34);}
  .exp-body{padding:11px 14px; max-height:44vh; overflow:auto; line-height:1.6; color:#20303f;}
  .exp-body .exp-meta{display:flex; flex-wrap:wrap; gap:6px; margin-bottom:9px;}
  .exp-body .given{background:#f6f9fd; border:1px dashed var(--blue-m); border-radius:7px; padding:7px 11px; margin:9px 0; font-size:13px;}
  .exp-body table.tbl{font-size:12.5px;}
  .exp-body ul.pts,.exp-body ol.pts{padding-left:20px;}
  .exp-foot{border-top:1px solid var(--line); padding:8px 12px; display:flex; gap:8px; background:var(--gray-l);}
  .exp-foot button{flex:1; border:none; border-radius:7px; padding:8px 10px; font-size:12.5px;
    font-weight:700; cursor:pointer; background:var(--blue-m); color:#fff; font-family:inherit;}
  .exp-foot button:hover{filter:brightness(1.1);}
  .expanel.min .exp-body,.expanel.min .exp-foot{display:none;}
  @media(max-width:560px){ .expanel{width:calc(100vw - 20px);} .exp-body{max-height:38vh;} }
  .exflash{animation:exflash 1.6s ease-out 1;}
  @keyframes exflash{0%,55%{box-shadow:0 0 0 4px rgba(214,158,46,.85);}100%{box-shadow:0 0 0 0 rgba(214,158,46,0);}}
  .iepnote{font-size:12px; color:var(--org-d); background:var(--org-l); border-left:3px solid #d08000; padding:6px 10px; border-radius:4px; margin:0 0 10px;}
  .pannote{font-size:12px; color:var(--red-d); background:var(--red-l); border-left:3px solid var(--red-d); padding:6px 10px; border-radius:4px; margin:0 0 10px;}
  .tf-row{display:flex; align-items:center; gap:10px; padding:8px 0; border-bottom:1px solid #e6eaef;}
  .tf-row:last-child{border-bottom:none;}
  .tf-row .stmt{flex:1;}
  .tf-btns{display:flex; gap:6px;}
  .tf-btns button{width:38px; height:34px; border:1.5px solid var(--blue-m); background:#fff; color:var(--blue-m); border-radius:7px; cursor:pointer; font-weight:700;}
  .tf-btns button.sel{background:var(--blue-m); color:#fff;}
  .tf-row.correct .stmt{color:var(--green-d);}
  .tf-row.wrong .stmt{color:var(--red-d);}
  .tf-btns button.right{background:var(--green-d)!important; color:#fff!important; border-color:var(--green-d)!important;}
  .tf-btns button.badpick{background:var(--red-d)!important; color:#fff!important; border-color:var(--red-d)!important;}
  .expl{font-size:13px; color:#555; margin-top:6px; padding:7px 10px; background:#fff; border-radius:6px; display:none;}
  .expl.show{display:block;}
  .mcq-opt{display:block; width:100%; text-align:left; padding:10px 14px; margin:6px 0; border:1.5px solid var(--line); background:#fff; border-radius:8px; cursor:pointer; font-size:14px;}
  .mcq-opt:hover{border-color:var(--blue-m);}
  .mcq-opt.sel{border-color:var(--blue-m); background:var(--blue-l);}
  .mcq-opt.right{border-color:var(--green-d); border-width:2px; background:var(--green-l); font-weight:700;}
  .mcq-opt.badpick{border-color:var(--red-d); border-width:2px; background:var(--red-l);}
  .mcq-opt.right::after{content:'\2713\00A0σωστή απάντηση'; float:right; margin-left:12px; color:var(--green-d); font-size:12px; font-weight:800; white-space:nowrap;}
  .mcq-opt.badpick::after{content:'\2717\00A0η επιλογή σου'; float:right; margin-left:12px; color:var(--red-d); font-size:12px; font-weight:800; white-space:nowrap;}
  @media(max-width:520px){ .mcq-opt.right::after,.mcq-opt.badpick::after{float:none; display:block; margin:4px 0 0;} }
  .match-grid{display:flex; gap:16px; flex-wrap:wrap;}
  .match-col{flex:1; min-width:240px;}
  .match-item{display:flex; align-items:center; gap:8px; padding:8px 10px; margin:6px 0; border:1.5px solid var(--line); border-radius:8px; background:#fff; font-size:13.5px;}
  .match-item .num{font-weight:700; color:var(--blue-d); min-width:20px;}
  .match-item select{margin-left:auto; padding:5px 8px; border:1px solid var(--blue-m); border-radius:6px; font-size:14px; background:#fff;}
  .match-item.correct{background:var(--green-l); border-color:var(--green-d);}
  .match-item.wrong{background:var(--red-l); border-color:var(--red-d);}
  .match-right .match-item{background:#f0f6fc;}
  .fb-row{padding:10px 0; border-bottom:1px solid #e6eaef;} .fb-row:last-child{border-bottom:none;}
  .fb-q{display:inline;}
  .fb-row pre.code{margin:6px 0 8px; display:block;}
  .fb-row .prompt{display:inline-block; margin-top:4px;}
  .ex .q pre.code{margin:8px 0; font-weight:normal;}
  .fb-row input{border:none; border-bottom:2px solid var(--blue-m); background:transparent; font-size:14px; padding:2px 6px; min-width:80px; text-align:center; color:var(--blue-d); font-weight:600;}
  .fb-row input.right{border-color:var(--green-d); color:var(--green-d);}
  .fb-row input.wrong{border-color:var(--red-d); color:var(--red-d);}
  .fb-ans{font-size:13px; color:var(--green-d); margin-left:8px; display:none;}
  .check-btn{background:var(--green-d); color:#fff; border:none; padding:10px 22px; border-radius:8px; cursor:pointer; font-size:14px; font-weight:600; margin-top:12px;}
  .check-btn:hover{filter:brightness(1.1);}
  .result{margin-top:12px; font-weight:600; display:none;} .result.show{display:block;}
  .nav-btns{display:flex; justify-content:space-between; margin-top:30px;}
  .nav-btns button{background:var(--blue-m); color:#fff; border:none; padding:10px 20px; border-radius:8px; cursor:pointer; font-size:14px;}
  .nav-btns button:disabled{opacity:.35; cursor:default;}

  .tabbar{position:sticky;top:0;z-index:55;display:flex;background:var(--blue-d);box-shadow:0 2px 8px rgba(0,0,0,.15);}
  .tabbar button{flex:1;border:none;background:transparent;color:#cfe0f0;padding:14px 8px;font-size:15px;font-weight:700;cursor:pointer;border-bottom:3px solid transparent;transition:.15s;}
  .tabbar button:hover{background:rgba(255,255,255,.08);color:#fff;}
  .tabbar button.active{color:#fff;border-bottom-color:#5fd47a;background:rgba(255,255,255,.10);}
  /* Ξεχωριστό χρώμα ανά καρτέλα */
  .tabbar button[data-tab="lessons"]{border-bottom-color:#4a90d9;}
  .tabbar button[data-tab="pan"]{border-bottom-color:#e0663a;}
  .tabbar button[data-tab="guide"]{border-bottom-color:#b06fe0;}
  .tabbar button[data-tab="run"]{border-bottom-color:#3fa85a;}
  .tabbar button.active[data-tab="lessons"]{background:#4a90d9;color:#fff;border-bottom-color:#4a90d9;}
  .tabbar button.active[data-tab="pan"]{background:#e0663a;color:#fff;border-bottom-color:#e0663a;}
  .tabbar button.active[data-tab="guide"]{background:#b06fe0;color:#fff;border-bottom-color:#b06fe0;}
  .tabbar button.active[data-tab="run"]{background:#3fa85a;color:#fff;border-bottom-color:#3fa85a;}
  .lmenu{display:grid;grid-template-columns:1fr;gap:6px;margin:18px 0;}
  @media(min-width:640px){.lmenu{grid-template-columns:1fr 1fr;}}
  .lmenu button{display:flex;align-items:center;gap:12px;text-align:left;border:1px solid var(--line);background:#fff;border-radius:10px;padding:11px 14px;cursor:pointer;font-size:14px;color:var(--gray-d);transition:.15s;}
  .lmenu button:hover{border-color:var(--blue-m);background:var(--blue-l);transform:translateX(2px);}
  .lmenu .lnum{flex:0 0 auto;width:34px;height:34px;border-radius:8px;background:var(--blue-d);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:14px;}
  .lmenu .ltit{font-weight:600;line-height:1.35;}
  .backbtn{background:var(--blue-m);color:#fff;border:none;padding:9px 18px;border-radius:8px;cursor:pointer;font-size:14px;font-weight:600;margin:6px 8px 4px 0;}
  .backbtn:hover{filter:brightness(1.1);}
  .toc{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin:16px 0;}
  .toc h2{margin:0 0 8px;color:var(--blue-d);font-size:16px;}
  .toc a{color:var(--blue-m);text-decoration:none;font-size:13px;display:inline-block;margin:3px 10px 3px 0;}
  .toc a:hover{text-decoration:underline;}
  .tabview{display:none;} .tabview.show{display:block;}
  .ieplink{display:inline-flex;align-items:center;gap:10px;background:var(--green-d);color:#fff;text-decoration:none;font-weight:700;font-size:16px;padding:14px 22px;border-radius:10px;margin:10px 0;box-shadow:0 2px 6px rgba(0,0,0,.12);}
  .ieplink:hover{filter:brightness(1.08);}
  .iepattr{font-size:12px;color:#5a6b7d;background:#f4f8fc;border:1px solid var(--line);border-left:3px solid var(--blue-m);border-radius:6px;padding:10px 14px;margin:16px 0;line-height:1.5;}
  .iepattr a{color:var(--blue-m);}
  .rev-index{columns:2;column-gap:26px;margin:8px 0;}
  @media(max-width:560px){.rev-index{columns:1;}}
  .rev-index a{display:block;color:var(--blue-m);text-decoration:none;font-size:13.5px;padding:4px 0;break-inside:avoid;}
  .rev-index a:hover{text-decoration:underline;}
  .rev-index a b{color:var(--blue-d);}
  /* Θέματα Πανελληνίων */
  .ygrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px;margin:14px 0;}
  .ygrid button{display:flex;flex-direction:column;align-items:center;gap:2px;border:1px solid var(--line);background:#fff;border-radius:12px;padding:14px 8px;cursor:pointer;transition:.15s;}
  .ygrid button:hover{border-color:var(--blue-m);background:var(--blue-l);transform:translateY(-2px);}
  .ygrid .yy{font-weight:800;color:var(--blue-d);font-size:20px;}
  .ygrid .yl{font-size:11px;color:#5a6b7d;}
  .pv .pvh{background:var(--blue-d);color:#fff;padding:12px 16px;border-radius:10px 10px 0 0;font-weight:700;font-size:16px;margin-top:6px;}
  .pv .pvbody{background:#fff;border:1px solid var(--line);border-top:none;border-radius:0 0 10px 10px;padding:14px;}
  .pv iframe{width:100%;height:82vh;border:1px solid var(--line);border-radius:8px;background:#fff;}
  .openlink{display:inline-block;margin:8px 0 0 4px;font-size:13px;color:var(--blue-m);text-decoration:none;font-weight:600;}
  .openlink:hover{text-decoration:underline;}
  /* Διερμηνευτής */
  .runwrap{display:grid;grid-template-columns:1fr;gap:14px;margin-top:16px;}
  @media(min-width:900px){.runwrap{grid-template-columns:1.4fr 1fr;}}
  .runcol h3{margin:0 0 6px;color:var(--blue-d);font-size:14px;}
  textarea.code-in{width:100%;min-height:340px;resize:vertical;font-family:"SF Mono",Consolas,Monaco,monospace;font-size:13px;line-height:1.5;padding:12px 14px;border:1.5px solid var(--blue-m);border-radius:8px;background:#0f1720;color:#e6edf3;-webkit-user-select:text;user-select:text;white-space:pre;overflow:auto;tab-size:3;}
  textarea.data-in{width:100%;min-height:120px;resize:vertical;font-family:"SF Mono",Consolas,Monaco,monospace;font-size:13px;line-height:1.5;padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;background:#fbfdff;color:#12263a;-webkit-user-select:text;user-select:text;white-space:pre;}
  .runbtns{display:flex;flex-wrap:wrap;gap:10px;margin:10px 0;}
  .runbtns button{border:none;border-radius:8px;padding:11px 20px;font-size:14px;font-weight:700;cursor:pointer;}
  .btn-run{background:#1a7d34;color:#fff;} .btn-rst{background:#eef1f5;color:#556;border:1px solid var(--line)!important;} .btn-smp{background:var(--blue-m);color:#fff;} .btn-stop{background:#a01818;color:#fff;} .btn-flow{background:#7a3a00;color:#fff;} .btn-ins{background:var(--blue-m);color:#fff;border:none;border-radius:8px;padding:8px 14px;font-size:13px;font-weight:700;cursor:pointer;margin-top:8px;}
  /* Οπτικοποίηση πινάκων */
  .arrayview{margin-top:14px;background:#fff;border:2px solid #7a3a00;border-radius:10px;padding:12px 14px;}
  .arrayview h3.harr{margin:0 0 10px;color:#7a3a00;font-size:15px;}
  .arrtitle{font-weight:700;color:#1a3a5c;margin:10px 0 4px;font-family:"SF Mono",Consolas,Monaco,monospace;}
  table.arrtab{border-collapse:collapse;margin:2px 0 6px;}
  table.arrtab td,table.arrtab th{border:1px solid #9bb;min-width:34px;height:30px;text-align:center;font-size:13px;font-family:"SF Mono",Consolas,Monaco,monospace;padding:2px 6px;}
  table.arrtab th{background:#eef4fb;color:#5a6b7d;font-weight:600;}
  table.arrtab td{background:#fff;color:#12263a;}
  table.arrtab td.filled{background:#e4f6e9;color:#1a5c2a;font-weight:700;}
  /* Πλαίσιο διαγράμματος ροής (inline, αυξομειούμενο) */
  .flowpanel{margin-top:14px;border:2px solid #7a3a00;border-radius:10px;overflow:hidden;background:#fff;display:flex;flex-direction:column;height:62vh;min-height:300px;resize:vertical;}
  .flowpanel .flowbar{display:flex;justify-content:space-between;align-items:center;background:#7a3a00;color:#fff;padding:10px 16px;font-weight:700;font-size:15px;flex:0 0 auto;}
  .flowpanel .flowzoom{display:flex;gap:6px;align-items:center;}
  .flowpanel .flowbar button{background:#fff;color:#7a3a00;border:none;border-radius:7px;padding:6px 12px;font-weight:700;cursor:pointer;font-size:14px;}
  .flowpanel .flowbar button:hover{filter:brightness(.95);}
  .flowscroll{flex:1;overflow:auto;background:#fbfdff;padding:16px;}
  .flowdiagram{transform-origin:top left;display:inline-block;}
  .flowdiagram svg{max-width:none;height:auto;}
  .runbtns button:hover,.btn-ins:hover{filter:brightness(1.08);}
  .runbtns button:disabled{opacity:.4;cursor:default;filter:none;}
  .speedlbl{font-size:13px;color:#334;font-weight:600;display:inline-flex;align-items:center;gap:6px;}
  .speedlbl select{padding:8px 10px;border:1.5px solid var(--blue-m);border-radius:8px;font-size:13px;background:#fff;}
  .cmdsbox{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff;}
  .cmdsbox h3{margin:0 0 8px;}
  .cmdsbox select{width:100%;padding:9px 10px;border:1.5px solid var(--blue-m);border-radius:8px;font-size:13.5px;background:#fff;}
  pre.cmdsyntax{background:#eef4fb;color:#1a3a5c;padding:8px 12px;border-radius:8px;border:1px solid var(--line);font-family:"SF Mono",Consolas,Monaco,monospace;font-size:12.5px;line-height:1.45;white-space:pre-wrap;margin:8px 0 0;}
  .stepinfo{font-family:"SF Mono",Consolas,Monaco,monospace;font-size:12.5px;color:#1a5c2a;background:#e4f6e9;border:1px solid #bfe6c9;border-radius:6px;padding:6px 10px;margin-top:8px;min-height:20px;display:none;}
  .stepinfo.show{display:block;}
  /* Πεδίο εισόδου: ΜΕΣΑ στη μαύρη κονσόλα, σαν η επόμενη γραμμή τερματικού */
  .inrow{flex:0 0 auto;display:none;align-items:center;gap:9px;background:#0e1a12;padding:0 16px 14px;font-family:"SF Mono",Consolas,Monaco,monospace;}
  .inrow.ask{animation:inflash 1s ease-out 2;}
  @keyframes inflash{0%{background:#14361f;}70%{background:#0e1a12;}100%{background:#0e1a12;}}
  .inrow .inico{font-size:15px;line-height:1;}
  .inrow .inprompt{color:#5fd47a;font-family:inherit;font-size:14px;font-weight:700;white-space:nowrap;}
  .inrow .inbox{flex:1;min-width:60px;background:transparent;color:#eaffef;border:none;border-bottom:2px solid #2f6b45;border-radius:0;font-family:inherit;font-size:14px;padding:4px 2px;outline:none;caret-color:#5fd47a;-webkit-user-select:text;user-select:text;}
  .inrow .inbox::placeholder{color:#4d6b5c;}
  .inrow .inbox:focus{border-bottom-color:#5fd47a;}
  .inrow .btn-in{background:#1a7d34;color:#fff;border:none;border-radius:6px;padding:6px 13px;font-size:12.5px;font-weight:700;cursor:pointer;}
  .inrow .btn-in:hover{filter:brightness(1.15);}
  /* Δείκτης συντακτικού ελέγχου (ζωντανός) */
  .syn{display:none;font-family:"SF Mono",Consolas,Monaco,monospace;font-size:11.5px;font-weight:700;padding:3px 10px;border-radius:20px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:58%;cursor:pointer;}
  .syn.ok{display:inline-block;background:#d9f2e1;color:#12602c;cursor:default;}
  .syn.bad{display:inline-block;background:#ffdede;color:#8f1616;}
  .syn.bad:hover{background:#ffcfcf;}
  pre.console{background:#0f1720;color:#d7f5df;min-height:180px;max-height:60vh;overflow:auto;padding:14px 16px;border-radius:8px;font-family:"SF Mono",Consolas,Monaco,monospace;font-size:13px;line-height:1.5;white-space:pre-wrap;border:1px solid #24303c;}
  pre.console.haserr{color:#ffd9d9;}
  .runhelp{font-size:12.5px;color:#5a6b7d;background:#f4f8fc;border:1px solid var(--line);border-left:3px solid var(--blue-m);border-radius:6px;padding:10px 14px;margin:6px 0 0;line-height:1.5;}
  .modeseg{display:inline-flex;border:1.5px solid var(--blue-m);border-radius:10px;overflow:hidden;margin:14px 0 4px;}
  .modeseg button{border:none;background:#fff;color:var(--blue-m);padding:9px 16px;font-size:13.5px;font-weight:700;cursor:pointer;}
  .modeseg button+button{border-left:1.5px solid var(--blue-m);}
  .modeseg button.active{background:var(--blue-d);color:#fff;}
  .modehint{font-size:12px;color:#5a6b7d;margin:2px 0 0;}
  /* Πλήρης πλάτος (full-bleed, τέρμα δεξιά) για τον διερμηνευτή */
  #tab-run.show{width:100vw;margin-left:calc(50% - 50vw);padding:0 26px 48px;box-sizing:border-box;}
  /* Toolbar εντολών (μία γραμμή) */
  .cmdsbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:4px 0 10px;}
  .cmdsbar .cmdslbl{font-size:13px;font-weight:700;color:#7a3a00;}
  .cmdsbar select{padding:7px 9px;border:1.5px solid #7a3a00;border-radius:7px;font-size:13px;background:#fff;max-width:260px;}
  .cmdsbar .cmdsyntax{color:#5a6b7d;font-family:"SF Mono",Consolas,Monaco,monospace;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1;min-width:120px;}
  /* Δύο κάθετα παράθυρα με συρόμενη μπάρα */
  .splitwrap{display:flex;flex-direction:column;height:72vh;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;}
  .pane{display:flex;flex-direction:column;min-height:80px;}
  .pane-code{height:48%;overflow:hidden;}
  .pane-out{flex:1;overflow:hidden;}
  .paneh{flex:0 0 auto;padding:6px 12px;font-weight:700;font-size:13px;color:#fff;display:flex;justify-content:space-between;align-items:center;gap:10px;}
  #paneCode .paneh{background:#2c5f8a;border-radius:10px 10px 0 0;}
  .pane-out .paneh{background:#1a5c2a;}
  .splitter{flex:0 0 auto;height:12px;line-height:8px;text-align:center;color:#8a99a8;background:#e6ebf1;cursor:row-resize;border-top:1px solid #c3ccd6;border-bottom:1px solid #c3ccd6;user-select:none;font-size:14px;}
  .splitter:hover{background:#d3dbe4;color:#556;}
  .pane-code .edwrap{flex:1;border:none;border-radius:0;min-height:0;overflow:visible;}
  #tab-run.show textarea.code-in{min-height:0;height:100%;}
  .pane-out .console{flex:1;min-height:0;max-height:none;border:none;border-radius:0;margin:0;}
  .paneh .stepinfo{background:transparent;border:none;color:#eaf6ee;padding:0;margin:0;min-height:0;font-size:12px;font-family:"SF Mono",Consolas,Monaco,monospace;max-width:60%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
  /* Ξεκάθαρα, χρωματικά διακριτά πεδία */
  .runcol h3{display:inline-block;padding:6px 14px;border-radius:8px 8px 0 0;margin:0;font-size:14px;color:#fff;font-weight:700;}
  #edTitle{background:#2c5f8a;}
  .cmdsbox h3{background:#7a3a00;color:#fff;}
  .runcol h3.hcons{background:#1a5c2a;}
  .edwrap{position:relative;display:flex;border:2px solid #2c5f8a;border-top-left-radius:0;border-radius:0 8px 8px 8px;background:#0f1720;overflow:visible;}
  .gutter{flex:0 0 auto;min-width:36px;padding:12px 8px 12px 6px;text-align:right;color:#5f7f99;background:#0b1219;font-family:"SF Mono",Consolas,Monaco,monospace;font-size:13px;line-height:1.5;white-space:pre;overflow:hidden;user-select:none;-webkit-user-select:none;border-right:1px solid #1e2b38;box-sizing:border-box;}
  textarea.code-in{flex:1;background:transparent;color:#e6edf3;border:none;border-radius:0;box-shadow:none;position:relative;z-index:1;}
  .linehi{position:absolute;left:0;right:0;display:none;background:rgba(95,212,122,0.22);border-top:1.5px solid rgba(95,212,122,.8);border-bottom:1.5px solid rgba(95,212,122,.8);pointer-events:none;z-index:2;}
  .linehi.err{background:rgba(224,72,72,0.30);border-top-color:rgba(224,72,72,.9);border-bottom-color:rgba(224,72,72,.9);}
  .cmdsbox{border:2px solid #7a3a00;border-top-left-radius:0;background:#fff8ef;padding:0 12px 12px;}
  .cmdsbox select{width:100%;padding:6px;border:1.5px solid #7a3a00;border-radius:8px;font-size:13px;background:#fff;margin-top:8px;}
  .cmdsbox select option{padding:4px 6px;}
  pre.console{background:#0e1a12;color:#d7f5df;border:2px solid #1a5c2a;border-top-left-radius:0;}
  .data-in{display:none;}
  /* Αυτοσυμπλήρωση κλεισίματος (ΤΕΛΟΣ_… / ΜΕΧΡΙΣ_ΟΤΟΥ) */
  .acbox{position:absolute;z-index:8;display:none;flex-direction:column;min-width:190px;max-width:320px;max-height:210px;overflow:auto;background:#fffdf5;border:1.5px solid #b58900;border-radius:8px;box-shadow:0 8px 22px rgba(0,0,0,.22);padding:4px;}
  .acbox .actitle{display:none;}
  .acbox button{display:block;width:100%;text-align:left;background:transparent;border:none;color:#3a2a00;border-radius:6px;padding:6px 10px;font-size:13px;font-weight:600;cursor:pointer;font-family:"SF Mono",Consolas,Monaco,monospace;white-space:nowrap;}
  .acbox button:hover,.acbox button.sel{background:#ffe4a0;}


.hero-note{max-width:980px;margin:12px auto 0;background:#eef6fc;border:1px solid #b7d4ea;border-radius:10px;padding:10px 14px;color:#254766;font-size:13px}.lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(245px,1fr));gap:12px}.lesson-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;cursor:pointer;transition:.15s;box-shadow:0 2px 8px #16324d0d}.lesson-card:hover{transform:translateY(-2px);border-color:var(--blue-m);box-shadow:0 5px 15px #16324d1a}.lesson-card .n{font-weight:800;color:#fff;background:var(--blue-d);border-radius:20px;padding:3px 9px;font-size:12px}.lesson-card h3{margin:10px 0 6px;font-size:16px;color:var(--blue-d)}.lesson-card .meta{font-size:12px;color:#667}.unit-badge{display:inline-block;background:#edf4fa;color:var(--blue-d);border:1px solid #c5d8e8;padding:4px 8px;border-radius:999px;font-size:12px;font-weight:700}.lesson-title{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.lesson-title h2{margin:0;color:var(--blue-d)}.objective{background:#f7fbff;border-left:4px solid var(--blue-m);padding:10px 14px;margin:12px 0;border-radius:5px}.theory-list{padding-left:20px}.theory-list li{margin:9px 0;line-height:1.6}.example-box{background:#fff8e8;border:1px solid #edd39e;border-radius:9px;padding:12px 14px;margin:14px 0}.codebox{background:#0f1720;color:#e6edf3;border-radius:9px;padding:14px;white-space:pre-wrap;overflow:auto;font-family:Consolas,monospace;font-size:13px;line-height:1.55}.lesson-actions{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.action{border:0;border-radius:8px;padding:9px 12px;font-weight:700;cursor:pointer;background:var(--blue-m);color:white}.action.secondary{background:#fff;color:var(--blue-d);border:1px solid var(--line)}.exercise{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0}.exercise h4{margin:0 0 8px;color:var(--blue-d)}.solution{margin-top:9px;border-top:1px dashed #ccd;padding-top:9px}.quiz-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px;margin:10px 0}.quiz-card label{display:block;margin:6px 0;cursor:pointer}.quiz-result{padding:12px;border-radius:8px;margin-top:10px;font-weight:700}.quiz-result.good{background:#e8f6ec;color:#155724}.quiz-result.bad{background:#fff0f0;color:#8b1d1d}.diagram-box{background:white;border:1px solid var(--line);border-radius:10px;padding:12px;margin:12px 0;overflow:auto}.scopebox{background:#fff7e8;border:1px solid #e8c67e;border-radius:10px;padding:14px;margin:12px 0}.scopebox strong{color:#754d00}.searchrow{display:flex;gap:10px;margin:10px 0 16px}.searchrow input{flex:1;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14px}.exercise-index details{margin:9px 0;background:white;border:1px solid var(--line);border-radius:10px;padding:10px 12px}.footer{padding:25px;text-align:center;color:#718096;font-size:12px}.srcbuttons{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.srcbuttons a{display:inline-block;text-decoration:none;background:#eef5fb;border:1px solid #c7dcea;color:var(--blue-d);padding:8px 10px;border-radius:8px;font-weight:700;font-size:13px}

/* ── Διαγράμματα / επεξηγηματικό παράθυρο Β΄ Λυκείου ── */
.diagram-modal{position:fixed;inset:0;z-index:110;background:rgba(10,24,38,.58);display:none;align-items:center;justify-content:center;padding:24px}
.diagram-modal.show{display:flex}
.diagram-modal-card{width:min(1040px,96vw);max-height:90vh;background:#fff;border:2px solid var(--blue-d);border-radius:14px;box-shadow:0 18px 55px rgba(0,0,0,.35);overflow:hidden;display:flex;flex-direction:column}
.diagram-modal-head{display:flex;justify-content:space-between;align-items:center;background:var(--blue-d);color:#fff;padding:11px 15px;font-size:15px}
.diagram-modal-head button{border:0;background:rgba(255,255,255,.18);color:#fff;border-radius:7px;width:30px;height:28px;font-weight:800;cursor:pointer}
.diagram-modal-body{padding:18px;overflow:auto;background:#f8fbfe}
.diagram-modal-body svg{display:block;width:min(920px,100%);height:auto;margin:auto;background:#fff;border:1px solid #dbe5ef;border-radius:10px}
.diagram-legend{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 4px}
.diagram-legend span{background:#f5f8fb;border:1px solid #ccd9e5;border-radius:999px;padding:5px 9px;font-size:12px;color:#29445e}
.context-section{margin:0 0 10px}
.context-section b{color:var(--blue-d)}
.context-steps{margin:5px 0 8px;padding-left:20px}
.context-steps li{margin:4px 0}
.context-warning{background:#fff5df;border:1px solid #e3bd65;border-left:4px solid #b67900;border-radius:7px;padding:8px 10px;margin-top:9px;color:#694400}
.context-diagram-key{display:grid;grid-template-columns:auto 1fr;gap:5px 9px;align-items:center;margin:8px 0}
.context-shape{display:inline-block;width:52px;height:24px;border:2px solid #1a3a5c;background:#fff;vertical-align:middle}
.context-shape.terminal{border-radius:999px;background:#eaf6ec;border-color:#1a5c2a}
.context-shape.io{transform:skew(-18deg);background:#f7fbff}
.context-shape.decision{width:30px;height:30px;transform:rotate(45deg);background:#fff8e8;border-color:#7a3a00;margin:4px 10px}
@media(max-width:700px){.diagram-modal{padding:8px}.diagram-modal-card{width:100%;max-height:94vh}.diagram-modal-body{padding:10px}}
@media(min-width:900px){
  .diagram-modal{justify-content:flex-start;padding-left:24px;padding-right:430px}
  .diagram-modal-card{width:100%;max-width:1000px}
}


/* v3 — 35–40 minute lesson design */
.card-focus{font-size:.86rem;color:#58708a;margin-top:8px;line-height:1.35}
.time-plan{display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:#f4f9fd;border:1px solid #cfe0ec;border-radius:12px;padding:12px 14px;margin:12px 0 18px}
.time-plan b{color:#17324d;margin-right:5px}
.time-plan span{background:white;border:1px solid #d6e3ec;border-radius:999px;padding:5px 9px;font-size:.84rem}
.hook-box,.activity-box{border-radius:14px;padding:16px 18px;margin:18px 0;line-height:1.58}
.hook-box{background:#fff8e7;border:1px solid #f0d58d}
.activity-box{background:#f0f7ff;border:1px solid #bfd9ef}
.hook-box p,.activity-box p{margin:.55rem 0 0}
.lesson-section{margin:22px 0}
.lesson-section>h3,.activity-box>h3{margin:0 0 12px;color:#17324d}
.section-note{font-size:.9rem;color:#526a80}
.theory-blocks{display:grid;gap:10px}
.theory-block{display:grid;grid-template-columns:32px 1fr;gap:10px;align-items:start;background:#fff;border:1px solid #dbe6ee;border-radius:12px;padding:12px 14px}
.theory-block>span{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:#e8f2fb;color:#17324d;font-weight:700}
.theory-block p{margin:2px 0;line-height:1.6}
.keypoints{background:#f7fbf7;border:1px solid #cfe3d1;border-radius:12px;padding:14px 18px 14px 36px}
.keypoints li{margin:6px 0;line-height:1.45}
.guide-row{padding:10px 0;border-bottom:1px solid #e4ebf0}
.guide-row small{display:block;color:#61788c;margin-top:4px}
.context-section p{margin:.45rem 0 .2rem;line-height:1.52}
.context-steps li{margin:7px 0;line-height:1.45}
.expanel .exp-body{max-height:62vh;overflow:auto}
@media(max-width:700px){
  .time-plan{align-items:flex-start}
  .time-plan span{font-size:.78rem}
  .theory-block{grid-template-columns:27px 1fr;padding:10px}
}
.card-coverage{margin:10px 0 8px;padding:9px 10px;border-radius:10px;background:#eef6fb;color:#315c78;font-size:12px;line-height:1.45}.book-card-link,.source-link{display:inline-flex;align-items:center;gap:5px;margin-top:8px;padding:6px 9px;border-radius:8px;background:#eef7ff;border:1px solid #c8dff0;color:#1d587f;text-decoration:none;font-size:12px;font-weight:800}.book-card-link:hover,.source-link:hover{text-decoration:underline}.lesson-coverage{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:8px 0 14px;padding:11px 13px;border:1px solid #d4e3ed;border-radius:12px;background:#f5f9fc;color:#315970}.lesson-coverage span{font-size:13px}.guide-row .source-link{margin-left:auto}