/* ============================================================
   TEK AYITI — fèy stil santral
   Pa gen okenn fichye ekstèn: sit la mache san entènèt.
   ============================================================ */

:root{
  --bg:#060a12;
  --bg-2:#0a1120;
  --panel:#0e1728;
  --panel-2:#131f34;
  --panel-3:#182741;
  --line:#22314d;
  --line-2:#2e4266;
  --text:#e8eefb;
  --text-2:#c2cfe6;
  --muted:#8fa2c0;
  --solar:#ffc93c;
  --solar-2:#ffb300;
  --teal:#35d6c0;
  --teal-2:#1fa894;
  --red:#ff6b6b;
  --green:#4ade80;
  --violet:#a78bfa;
  --blue:#60a5fa;
  --amber:#fbbf24;
  --radius:14px;
  --radius-sm:9px;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",Arial,sans-serif;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --max:1160px;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}

body{
  margin:0;
  background:
    radial-gradient(1100px 600px at 85% -10%, rgba(53,214,192,.10), transparent 60%),
    radial-gradient(900px 500px at 10% 0%, rgba(255,201,60,.08), transparent 55%),
    var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.72;
  min-height:100vh;
}

img,svg{max-width:100%}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2px solid var(--solar);
  outline-offset:2px;
  border-radius:4px;
}
h1,h2,h3,h4{line-height:1.24;margin:0 0 .5em;font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.2vw,3rem)}
h2{font-size:clamp(1.35rem,2.6vw,1.75rem);margin-top:2.2em}
h3{font-size:1.18rem;margin-top:1.8em}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.1em;padding-left:1.35em}
li{margin:.35em 0}
strong{color:#fff}
code{
  font-family:var(--mono);
  font-size:.9em;
  background:#0b1626;
  border:1px solid var(--line);
  border-radius:6px;
  padding:.1em .4em;
  color:#b8f5ea;
}
hr{border:0;border-top:1px solid var(--line);margin:2.5em 0}

.wrap{width:min(var(--max),100% - 2.4rem);margin-inline:auto}
.narrow{width:min(800px,100% - 2.4rem);margin-inline:auto}

.skip{
  position:absolute;width:1px;height:1px;overflow:hidden;
  clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;
}
.skip:focus{
  position:fixed;left:8px;top:8px;z-index:200;
  width:auto;height:auto;clip:auto;clip-path:none;overflow:visible;white-space:normal;
  background:var(--solar);color:#111;padding:.7rem 1rem;border-radius:8px;font-weight:700;
}

/* ---------------------------- Header ---------------------------- */
.site-head{
  position:sticky;top:0;z-index:100;
  background:rgba(6,10,18,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.head-in{display:flex;align-items:center;gap:1rem;min-height:66px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.65rem;color:var(--text);text-decoration:none;flex:0 0 auto}
.brand:hover{text-decoration:none}
.brand-mark{
  display:grid;place-items:center;
  width:38px;height:38px;border-radius:11px;
  background:linear-gradient(145deg,var(--solar),#f59e0b);
  color:#1a1200;font-size:1.2rem;
  box-shadow:0 4px 14px rgba(255,201,60,.28);
}
.brand-txt{display:flex;flex-direction:column;line-height:1.1}
.brand-txt strong{font-size:1.02rem;letter-spacing:.08em}
.brand-txt small{color:var(--muted);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase}

.nav-btn{
  display:none;margin-left:auto;
  background:var(--panel-2);color:var(--text);
  border:1px solid var(--line-2);border-radius:10px;
  padding:.5rem .8rem;font:inherit;font-size:.95rem;cursor:pointer;
}
.nav{display:flex;gap:.15rem;margin-left:auto;flex-wrap:wrap}
.nav a{
  color:var(--text-2);font-size:.92rem;font-weight:600;
  padding:.45rem .62rem;border-radius:8px;text-decoration:none;white-space:nowrap;
}
.nav a:hover{background:var(--panel-2);color:#fff;text-decoration:none}
.nav a[aria-current="page"]{color:#0c0a00;background:var(--solar)}
.nav a[aria-current="page"]:hover{background:var(--solar)}

.progress-line{height:3px;background:#101a2b}
.progress-line span{
  display:block;height:100%;width:0%;
  background:linear-gradient(90deg,var(--teal),var(--solar));
  transition:width .5s ease;
}

/* ---------------------------- Bouton ---------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font:inherit;font-weight:700;font-size:.96rem;
  padding:.66rem 1.15rem;border-radius:10px;cursor:pointer;
  border:1px solid var(--line-2);background:var(--panel-2);color:var(--text);
  text-decoration:none;transition:transform .12s ease,background .15s ease,border-color .15s ease;
}
.btn:hover{background:var(--panel-3);text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:linear-gradient(145deg,var(--solar),var(--solar-2));color:#1a1200;border-color:#d99f00}
.btn-primary:hover{background:linear-gradient(145deg,#ffd25e,var(--solar));color:#1a1200}
.btn-teal{background:var(--teal);color:#04201c;border-color:var(--teal-2)}
.btn-teal:hover{background:#4ee6d2;color:#04201c}
.btn-ghost{background:transparent}
.btn-sm{padding:.42rem .8rem;font-size:.86rem;border-radius:8px}
.btn-block{width:100%}

/* ---------------------------- Erò ak paj ---------------------------- */
.hero{padding:clamp(2.4rem,6vw,4.6rem) 0 1rem;position:relative}
.hero .eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;
  font-size:.76rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;
  color:var(--teal);background:rgba(53,214,192,.1);
  border:1px solid rgba(53,214,192,.3);border-radius:999px;padding:.3rem .8rem;margin-bottom:1.1rem;
}
.hero h1{max-width:20ch}
.hero h1 em{font-style:normal;color:var(--solar)}
.hero .lead{font-size:clamp(1.02rem,1.8vw,1.22rem);color:var(--text-2);max-width:62ch;margin-bottom:1.6rem}
.hero-actions{display:flex;gap:.7rem;flex-wrap:wrap;margin-bottom:1.2rem}
.hero-note{display:flex;gap:1.2rem;flex-wrap:wrap;color:var(--muted);font-size:.86rem}
.hero-note span{display:inline-flex;align-items:center;gap:.4rem}

.page-head{padding:2.6rem 0 1.2rem;border-bottom:1px solid var(--line);margin-bottom:2.4rem}
.page-head .kicker{color:var(--solar);font-weight:800;font-size:.76rem;letter-spacing:.16em;text-transform:uppercase}
.page-head h1{margin:.35rem 0 .6rem}
.page-head p{color:var(--text-2);max-width:70ch;margin:0}
.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:1rem}
.crumbs a{color:var(--muted)}
.crumbs span{margin:0 .4rem;opacity:.6}

/* ---------------------------- Grid & kat ---------------------------- */
.grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(255px,1fr))}
.grid-2{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.grid-3{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}

.card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:1.25rem 1.3rem;
  position:relative;
}
.card h3{margin-top:0}
.card p:last-child{margin-bottom:0}
.card-icon{
  display:grid;place-items:center;width:44px;height:44px;border-radius:12px;
  background:var(--panel-3);border:1px solid var(--line-2);
  font-size:1.35rem;margin-bottom:.85rem;
}
.card-link{display:block;color:inherit;text-decoration:none;transition:border-color .15s,transform .15s,box-shadow .15s}
.card-link:hover{text-decoration:none;border-color:var(--line-2);transform:translateY(-3px);box-shadow:var(--shadow)}
.card-link:focus-visible{outline:2px solid var(--solar)}
.card-more{margin-top:.9rem;color:var(--solar);font-weight:700;font-size:.9rem}
.card-meta{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.9rem}

.tag{
  display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;
  padding:.17rem .55rem;border-radius:999px;
  background:var(--panel-3);color:var(--text-2);border:1px solid var(--line-2);
}
.tag-teal{color:#9ff5e8;background:rgba(53,214,192,.12);border-color:rgba(53,214,192,.35)}
.tag-solar{color:#ffe6a3;background:rgba(255,201,60,.12);border-color:rgba(255,201,60,.35)}
.tag-red{color:#ffc2c2;background:rgba(255,107,107,.12);border-color:rgba(255,107,107,.35)}
.tag-violet{color:#d8ccff;background:rgba(167,139,250,.12);border-color:rgba(167,139,250,.35)}
.tag-blue{color:#c3ddff;background:rgba(96,165,250,.12);border-color:rgba(96,165,250,.35)}

/* ---------------------------- Leson layout ---------------------------- */
.lesson{display:grid;grid-template-columns:minmax(0,1fr) 262px;gap:2.6rem;align-items:start;padding-bottom:3rem}
.lesson-body{min-width:0}
.lesson-body h2{padding-top:.3em;border-top:1px solid var(--line)}
.lesson-body h2:first-child{border-top:0;padding-top:0;margin-top:0}
.lesson-body h3{color:#dce8ff}
.lesson-body > p:first-of-type{font-size:1.06rem;color:var(--text-2)}

.lesson-side{position:sticky;top:92px;display:grid;gap:1rem}
.toc{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:1rem 1.05rem;font-size:.88rem;
}
.toc h4{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 .6rem}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:toc}
.toc li{margin:0}
.toc a{
  display:block;color:var(--text-2);padding:.32rem 0 .32rem .1rem;
  border-left:2px solid transparent;padding-left:.6rem;line-height:1.35;
}
.toc a:hover{color:var(--solar);text-decoration:none;border-left-color:var(--solar)}
.side-card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:1rem 1.05rem;font-size:.88rem;color:var(--muted);
}
.side-card strong{color:var(--text)}
.side-card .btn{margin-top:.7rem}

/* ---------------------------- Callouts ---------------------------- */
.note{
  border-left:4px solid var(--blue);
  background:rgba(96,165,250,.08);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:.9rem 1.1rem;margin:1.4rem 0;
}
.note.tip{border-left-color:var(--teal);background:rgba(53,214,192,.08)}
.note.warn{border-left-color:var(--solar);background:rgba(255,201,60,.08)}
.note.danger{border-left-color:var(--red);background:rgba(255,107,107,.09)}
.note p:last-child{margin-bottom:0}
.note .note-t{
  display:block;font-weight:800;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;
  margin-bottom:.25rem;color:var(--blue);
}
.note.tip .note-t{color:var(--teal)}
.note.warn .note-t{color:var(--solar)}
.note.danger .note-t{color:var(--red)}

/* ---------------------------- Tablo ---------------------------- */
.table-wrap{overflow-x:auto;margin:1.2rem 0;border:1px solid var(--line);border-radius:var(--radius-sm)}
table{border-collapse:collapse;width:100%;font-size:.92rem;background:var(--panel)}
th,td{padding:.62rem .8rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--panel-2);color:#fff;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;white-space:nowrap}
tr:last-child td{border-bottom:0}
tbody tr:hover{background:rgba(255,255,255,.02)}
td code{white-space:nowrap}

/* ---------------------------- Kòd ---------------------------- */
pre{
  background:#060d18;border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:1rem 1.1rem;
  overflow-x:auto;font-size:.88rem;line-height:1.65;
  font-family:var(--mono);color:#d6e4ff;margin:1.1rem 0;
}
pre code{background:none;border:0;padding:0;color:inherit;font-size:1em}
.code-shell{border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;margin:1.1rem 0;background:#060d18}
.code-head{
  display:flex;justify-content:space-between;align-items:center;gap:1rem;
  padding:.4rem .7rem;background:var(--panel-2);border-bottom:1px solid var(--line);
  font-size:.76rem;color:var(--muted);font-family:var(--mono);
}
.code-head .btn{padding:.2rem .55rem;font-size:.74rem}
.code-shell pre{margin:0;border:0;border-radius:0}
.code-shell pre .c{color:#6f86a6;font-style:italic}

.term{
  background:#04080f;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:.9rem 1rem;font-family:var(--mono);font-size:.86rem;line-height:1.6;
  color:#b9e6c9;overflow-x:auto;
}
.term .p{color:var(--teal)}
.term .c{color:#7d8ca6}

/* ---------------------------- Quiz ---------------------------- */
.quiz{
  background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);padding:1.2rem 1.3rem;margin:1.8rem 0;
}
.quiz-head{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;flex-wrap:wrap;margin-bottom:.6rem}
.quiz h3,.quiz h4{margin:0}
.quiz-score{font-size:.82rem;color:var(--muted);font-family:var(--mono)}
.q{border-top:1px solid var(--line);padding:1rem 0 .4rem}
.q:first-of-type{border-top:0}
.q-stem{font-weight:600;margin-bottom:.7rem}
.q-stem .q-n{color:var(--solar);font-family:var(--mono);font-size:.85em;margin-right:.35rem}
.opt{
  display:block;width:100%;text-align:left;
  background:var(--bg-2);border:1px solid var(--line);border-radius:9px;
  color:var(--text);font:inherit;font-size:.93rem;font-weight:500;
  padding:.6rem .8rem;margin:.35rem 0;cursor:pointer;transition:border-color .12s,background .12s;
}
.opt:hover:not(:disabled){border-color:var(--line-2);background:var(--panel-2)}
.opt:disabled{cursor:default}
.opt.right{border-color:var(--green);background:rgba(74,222,128,.12)}
.opt.wrong{border-color:var(--red);background:rgba(255,107,107,.1)}
.opt .letter{color:var(--muted);font-family:var(--mono);margin-right:.5rem}
.why{
  font-size:.9rem;color:var(--text-2);border-left:2px solid var(--teal);
  padding:.5rem 0 .5rem .8rem;margin:.6rem 0 .2rem;display:none;
}
.why.show{display:block}
.fill-row{display:flex;gap:.5rem;flex-wrap:wrap}
.fill-row input{
  flex:1 1 200px;min-width:0;background:var(--bg-2);border:1px solid var(--line-2);
  border-radius:9px;padding:.55rem .75rem;color:var(--text);font:inherit;font-size:.95rem;
}
.btn-check{padding:.55rem .9rem}

/* ---------------------------- Exèsis kòd ---------------------------- */
.runner{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:1rem;margin:1.5rem 0;
}
.runner-head{display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap;margin-bottom:.6rem}
.runner-head h4{margin:0;font-size:.98rem}
.runner-head .tag{font-family:var(--mono)}
.ex-code{
  width:100%;min-height:130px;resize:vertical;
  background:#060d18;color:#cfe6ff;border:1px solid var(--line);border-radius:9px;
  padding:.8rem .9rem;font-family:var(--mono);font-size:.87rem;line-height:1.6;
  tab-size:2;white-space:pre;overflow-wrap:normal;overflow-x:auto;
}
.ex-bar{display:flex;gap:.5rem;align-items:center;margin-top:.6rem;flex-wrap:wrap}
.ex-out{
  margin:.7rem 0 0;padding:.7rem .85rem;background:#04080f;border:1px dashed var(--line-2);
  border-radius:9px;font-family:var(--mono);font-size:.85rem;white-space:pre-wrap;color:#b9e6c9;
  min-height:1.4em;
}
.ex-out.ok{border-color:var(--green);color:#b6f5cb}
.ex-out.bad{border-color:var(--red);color:#ffc0c0}
.ex-hint{font-size:.86rem;color:var(--muted);margin-top:.5rem;display:none}
.ex-hint.show{display:block}

/* ---------------------------- Defi ---------------------------- */
.hack-hero{
  background:
    linear-gradient(180deg,rgba(53,214,192,.06),transparent 70%),
    repeating-linear-gradient(0deg,transparent 0 23px,rgba(53,214,192,.028) 23px 24px),
    repeating-linear-gradient(90deg,transparent 0 23px,rgba(53,214,192,.028) 23px 24px);
  border-bottom:1px solid var(--line);
}
.score-bar{
  display:flex;gap:1rem;flex-wrap:wrap;align-items:center;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:.8rem 1rem;margin:1.4rem 0;font-size:.88rem;
}
.score-bar strong{font-family:var(--mono);color:var(--solar);font-size:1.05rem}
.score-bar .sep{width:1px;height:20px;background:var(--line-2)}
.filters{display:flex;gap:.4rem;flex-wrap:wrap;margin:1rem 0 1.6rem}
.filter{
  background:var(--panel);border:1px solid var(--line);color:var(--text-2);
  border-radius:999px;padding:.34rem .85rem;font:inherit;font-size:.85rem;cursor:pointer;
}
.filter:hover{border-color:var(--line-2);color:#fff}
.filter[aria-pressed="true"]{background:var(--teal);border-color:var(--teal);color:#04201c;font-weight:700}

.challenge{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:1.15rem 1.25rem;margin-bottom:1rem;
}
.challenge.solved{border-color:rgba(74,222,128,.45);box-shadow:inset 3px 0 0 var(--green)}
.ch-top{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;flex-wrap:wrap}
.ch-top h3{margin:.1rem 0 .3rem;font-size:1.1rem}
.ch-id{font-family:var(--mono);font-size:.76rem;color:var(--muted)}
.diff{display:inline-flex;gap:3px;align-items:center}
.diff i{width:7px;height:7px;border-radius:50%;background:var(--line-2);display:block}
.diff i.on{background:var(--solar)}
.ch-body{margin-top:.7rem;font-size:.95rem;color:var(--text-2)}
.ch-body p:last-child{margin-bottom:.6rem}
.ch-answer{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.8rem}
.ch-answer input{
  flex:1 1 220px;min-width:0;background:#060d18;border:1px solid var(--line-2);border-radius:9px;
  padding:.55rem .75rem;color:var(--text);font-family:var(--mono);font-size:.9rem;
}
.ch-feedback{font-size:.9rem;margin-top:.6rem}
.ch-feedback.ok{color:var(--green)}
.ch-feedback.bad{color:var(--red)}
.ch-tools{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.6rem}
.flag{
  display:inline-block;font-family:var(--mono);font-size:.85em;
  background:rgba(74,222,128,.1);border:1px dashed rgba(74,222,128,.45);
  color:#b6f5cb;border-radius:6px;padding:.15rem .5rem;
}
.solved-stamp{
  display:inline-flex;align-items:center;gap:.35rem;color:var(--green);
  font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
}

/* ---------------------------- Labo ---------------------------- */
.lab{
  background:#080f1b;border:1px solid var(--line-2);border-radius:var(--radius);
  overflow:hidden;margin:1.3rem 0;
}
.lab-bar{
  display:flex;align-items:center;gap:.45rem;padding:.45rem .75rem;
  background:var(--panel-2);border-bottom:1px solid var(--line);
  font-size:.75rem;color:var(--muted);font-family:var(--mono);
}
.lab-bar .dot{width:9px;height:9px;border-radius:50%;background:#33445f}
.lab-bar .dot.r{background:#ff6b6b}.lab-bar .dot.y{background:#ffc93c}.lab-bar .dot.g{background:#4ade80}
.lab-bar .url{margin-left:.5rem;background:#060d18;border-radius:5px;padding:.1rem .5rem;color:#93a7c4}
.lab-body{padding:1rem 1.1rem}

/* ---------------------------- Zouti ---------------------------- */
.tool{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:1.25rem 1.3rem;margin-bottom:1.2rem;
}
.tool h3{margin-top:0;display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}
.tool .formula{
  font-family:var(--mono);font-size:.85rem;color:var(--solar);
  background:rgba(255,201,60,.07);border:1px solid rgba(255,201,60,.25);
  border-radius:6px;padding:.35rem .6rem;display:inline-block;margin-bottom:.8rem;
}
.fields{display:grid;gap:.7rem;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));margin:.8rem 0}
.field{display:flex;flex-direction:column;gap:.25rem}
.field label{font-size:.8rem;color:var(--muted);font-weight:600;letter-spacing:.02em}
.field input,.field select{
  background:#060d18;border:1px solid var(--line-2);border-radius:8px;
  padding:.5rem .65rem;color:var(--text);font:inherit;font-size:.94rem;width:100%;
}
.field input[type=number]{font-family:var(--mono)}
.out{
  background:#04080f;border:1px solid var(--line);border-radius:9px;
  padding:.8rem .95rem;font-family:var(--mono);font-size:.88rem;line-height:1.75;
  overflow-x:auto;margin-top:.8rem;
}
.out b{color:var(--solar);font-weight:700}
.out .ok{color:var(--green)}
.out .bad{color:var(--red)}
.out .k{color:var(--muted)}
.tool-note{font-size:.85rem;color:var(--muted);margin-top:.6rem}
.tool table input{
  width:100%;background:#060d18;border:1px solid var(--line);border-radius:6px;
  padding:.35rem .45rem;color:var(--text);font:inherit;font-size:.88rem;
}
.tool table td{padding:.35rem .3rem}

/* Rezistans koulè */
.band-row{display:flex;gap:.6rem;flex-wrap:wrap;margin:.8rem 0}
.band-pick{display:flex;flex-direction:column;gap:.3rem;font-size:.78rem;color:var(--muted)}
.band-pick select{
  padding:.45rem .5rem;font-size:.85rem;
  background:#060d18;color:var(--text);
  border:1px solid var(--line-2);border-radius:8px;font-family:inherit;
}
.resistor{display:flex;align-items:center;gap:.55rem;margin:1rem 0;flex-wrap:wrap}
.res-body{
  display:flex;align-items:center;justify-content:center;gap:1.1rem;
  width:180px;height:46px;border-radius:8px;
  background:linear-gradient(180deg,#e8dcc3,#cdbfa1);
  border:1px solid #a99a7d;position:relative;
}
.res-body::before,.res-body::after{
  content:"";position:absolute;top:50%;width:18px;height:3px;background:#9aa7bb;
}
.res-body::before{left:-18px}.res-body::after{right:-18px}
.res-body .b{width:11px;height:100%;border-radius:2px}

/* ---------------------------- Pwogrè ---------------------------- */
.prog-card{
  background:linear-gradient(145deg,var(--panel-2),var(--panel));
  border:1px solid var(--line-2);border-radius:var(--radius);padding:1.3rem;
}
.prog-row{display:flex;justify-content:space-between;font-size:.88rem;margin:.7rem 0 .3rem;color:var(--text-2)}
.bar{height:9px;background:#0a1322;border-radius:999px;overflow:hidden;border:1px solid var(--line)}
.bar > span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--teal),var(--solar));transition:width .6s ease}

/* ---------------------------- Timeline / etap ---------------------------- */
.steps{list-style:none;padding:0;margin:1.4rem 0;counter-reset:st}
.steps > li{
  position:relative;padding:0 0 1.4rem 3rem;margin:0;
  border-left:2px solid var(--line);margin-left:.9rem;
}
.steps > li:last-child{border-left-color:transparent;padding-bottom:0}
.steps > li::before{
  counter-increment:st;content:counter(st);
  position:absolute;left:-1.05rem;top:-.15rem;
  display:grid;place-items:center;width:2rem;height:2rem;border-radius:50%;
  background:var(--panel-3);border:1px solid var(--line-2);color:var(--solar);
  font-family:var(--mono);font-size:.85rem;font-weight:700;
}
.steps h4{margin:.1rem 0 .3rem;font-size:1rem}
.steps p{font-size:.93rem;color:var(--text-2);margin-bottom:.3rem}

/* ---------------------------- Ba navba ---------------------------- */
.lesson-nav{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin:2.5rem 0 0;padding-top:1.4rem;border-top:1px solid var(--line)}
.lesson-nav a{font-size:.9rem;font-weight:600}
.finish-box{
  display:flex;gap:1rem;align-items:center;justify-content:space-between;flex-wrap:wrap;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:1rem 1.2rem;margin:2rem 0;
}
.finish-box p{margin:0;font-size:.92rem;color:var(--text-2)}
.finish-box.done{border-color:rgba(74,222,128,.5);background:rgba(74,222,128,.06)}

/* ---------------------------- Footer ---------------------------- */
.site-foot{
  border-top:1px solid var(--line);margin-top:3rem;
  padding:2.2rem 0 2.6rem;background:var(--bg-2);
}
.foot-grid{display:grid;gap:1.6rem;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.site-foot h4{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 .6rem}
.site-foot ul{list-style:none;padding:0;margin:0;font-size:.88rem}
.site-foot li{margin:.3rem 0}
.site-foot a{color:var(--text-2)}
.site-foot a:hover{color:var(--solar)}
.foot-bottom{
  margin-top:2rem;padding-top:1.2rem;border-top:1px solid var(--line);
  font-size:.82rem;color:var(--muted);display:flex;gap:1rem;justify-content:space-between;flex-wrap:wrap;
}

/* ---------------------------- Itil ---------------------------- */
.muted{color:var(--muted)}
.small{font-size:.85rem}
.center{text-align:center}
.mt0{margin-top:0}.mb0{margin-bottom:0}
.mt1{margin-top:.6rem}.mt2{margin-top:1.2rem}.mt3{margin-top:2rem}
.flex{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.pill-list{display:flex;gap:.4rem;flex-wrap:wrap;padding:0;list-style:none;margin:.8rem 0}
.pill-list li{margin:0}
.mono{font-family:var(--mono)}
.hl{background:rgba(255,201,60,.18);color:#ffe9a8;padding:0 .2em;border-radius:3px}
.hidden-flag{display:none}

/* ---------------------------- Robotik labo ---------------------------- */
.rb-title{font-size:1.3rem;margin:0 0 .5rem}
.rb-desc{margin:0 0 1.1rem;color:var(--text-2);max-width:75ch}
.rb-wrap{display:grid;grid-template-columns:minmax(0,1fr) 370px;gap:1.3rem;align-items:start}
.rb-wrap-pid{grid-template-columns:minmax(0,1fr) 320px}
.rb-stage{display:flex;flex-direction:column;gap:.6rem;min-width:0;align-items:flex-start}
.rb-stage canvas{
  display:block;width:auto;max-width:100%;height:auto;
  background:#08111f;border:1px solid var(--line-2);border-radius:10px;
}
.rb-controls{
  background:var(--panel-2);border:1px solid var(--line);
  border-radius:var(--radius);padding:.9rem .95rem;
}
.rb-missions{display:flex;gap:.35rem;flex-wrap:wrap;margin-bottom:.7rem}
.rb-program-head{
  display:flex;justify-content:space-between;align-items:baseline;gap:.5rem;
  font-size:.76rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);
  margin-bottom:.35rem;
}
.rb-program-head #rb-count{font-family:var(--mono);color:var(--solar);letter-spacing:0;text-transform:none}
.rb-program{
  display:flex;flex-wrap:wrap;gap:.3rem;min-height:52px;
  background:#060d18;border:1px solid var(--line);border-radius:9px;
  padding:.45rem;margin-bottom:.55rem;
}
.rb-empty{font-size:.8rem;color:var(--muted);padding:.35rem}
.rb-chip{
  display:inline-flex;align-items:center;gap:.25rem;
  background:var(--panel-3);border:1px solid var(--line-2);border-radius:7px;
  padding:.18rem .3rem .18rem .5rem;font-family:var(--mono);font-size:.82rem;color:var(--text);
}
.rb-chip-x{
  background:transparent;border:0;border-left:1px solid var(--line-2);color:var(--muted);cursor:pointer;
  font-size:.78rem;line-height:1;padding:.05rem .1rem .05rem .3rem;margin-left:.15rem;border-radius:0 4px 4px 0;
}
.rb-chip-x:hover{background:rgba(255,107,107,.2);color:#fff}
.rb-cmds{display:flex;gap:.35rem;flex-wrap:wrap;margin-bottom:.5rem}
.rb-run{display:flex;gap:.35rem;flex-wrap:wrap;margin-top:.4rem}
.rb-status{
  font-size:.82rem;color:var(--text-2);line-height:1.45;
  margin-top:.7rem;min-height:2.6em;
}
.rb-status.ok{color:var(--green)}
.rb-status.err{color:var(--red)}
.rb-status.warn{color:var(--solar)}
.rb-sensors{display:grid;grid-template-columns:repeat(3,1fr);gap:.4rem;margin-bottom:.6rem}
.rb-sensor{
  background:#060d18;border:1px solid var(--line);border-radius:8px;
  padding:.4rem;text-align:center;
}
.rb-sensor span{display:block;font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.rb-sensor b{display:block;font-family:var(--mono);font-size:.92rem;color:var(--teal);margin-top:.1rem}
.rb-lbl{display:block;font-size:.76rem;font-weight:700;color:var(--muted);margin:.2rem 0 .3rem;letter-spacing:.04em}
.rb-code{min-height:235px;font-size:.78rem;line-height:1.55;margin:0}
.rb-mini{font-family:var(--mono);font-size:.75rem;color:var(--muted);margin-top:.45rem}
.rb-log{
  font-family:var(--mono);font-size:.72rem;color:#b9e6c9;
  background:#04080f;border:1px dashed var(--line);border-radius:6px;
  padding:.35rem .5rem;margin-top:.4rem;min-height:1.6em;max-height:4.2em;overflow:auto;
  white-space:pre-wrap;
}
.rb-log:empty{display:none}
.rb-slider{margin:.55rem 0}
.rb-slider label{display:flex;justify-content:space-between;font-size:.8rem;color:var(--text-2);margin-bottom:.2rem}
.rb-slider label b{font-family:var(--mono);color:var(--solar)}
.rb-slider input[type=range]{
  width:100%;accent-color:var(--solar);background:transparent;cursor:pointer;
}
.rb-stats2{display:grid;grid-template-columns:1fr 1fr;gap:.4rem;margin-top:.7rem}
.rb-stats2 > div{
  background:#060d18;border:1px solid var(--line);border-radius:8px;padding:.45rem .55rem;
}
.rb-stats2 span{display:block;font-size:.68rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.rb-stats2 b{font-family:var(--mono);font-size:.92rem;color:var(--teal)}
.rb-formula{
  font-family:var(--mono);font-size:.78rem;line-height:1.7;color:var(--solar);
  background:rgba(255,201,60,.07);border:1px solid rgba(255,201,60,.25);
  border-radius:6px;padding:.4rem .6rem;
}
@media (max-width:940px){
  .rb-wrap,.rb-wrap-pid{grid-template-columns:1fr}
  .rb-controls{order:2}
  .rb-stage canvas{width:100%}
}

/* ---------------------------- Tradiktè ---------------------------- */
.tr-fab{
  position:fixed;right:18px;bottom:18px;z-index:120;
  display:inline-flex;align-items:center;gap:.45rem;
  background:var(--solar);color:#1a1200;border:1px solid #d99f00;
  font:inherit;font-weight:800;font-size:.95rem;
  padding:.62rem 1rem;border-radius:999px;cursor:pointer;
  box-shadow:0 8px 26px rgba(0,0,0,.5);
  transition:transform .12s ease,background .15s ease;
}
.tr-fab:hover{background:#ffd25e;transform:translateY(-1px)}
.tr-fab span[aria-hidden]{font-size:1.12rem;line-height:1}
.tr-panel{
  position:fixed;right:18px;bottom:82px;z-index:130;
  width:min(372px,calc(100vw - 24px));
  max-height:min(78vh,660px);overflow:auto;overscroll-behavior:contain;
  background:var(--panel);border:1px solid var(--line-2);
  border-radius:var(--radius);box-shadow:0 22px 70px rgba(0,0,0,.65);
}
.tr-panel[hidden]{display:none}
.tr-head{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.8rem 1rem;background:var(--panel-2);
  border-bottom:1px solid var(--line);position:sticky;top:0;z-index:1;
}
.tr-head strong{font-size:.98rem}
.tr-close{
  background:transparent;border:0;color:var(--muted);font-size:1rem;
  cursor:pointer;padding:.2rem .4rem;border-radius:6px;line-height:1;
}
.tr-close:hover{background:var(--panel-3);color:#fff}
.tr-body{padding:.9rem 1rem 1.1rem}
.tr-src{margin:0 0 .7rem;font-size:.82rem;color:var(--muted)}
.tr-src b{color:var(--text)}
.tr-lbl{display:block;font-size:.8rem;font-weight:700;color:var(--text-2);margin-bottom:.3rem}
.tr-select{
  width:100%;background:#060d18;color:var(--text);
  border:1px solid var(--line-2);border-radius:9px;
  padding:.55rem .6rem;font:inherit;font-size:.9rem;
}
.tr-actions{display:flex;gap:.45rem;flex-wrap:wrap;margin:.75rem 0 .7rem}
.tr-bar{height:6px;background:#0a1322;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.tr-bar > span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--teal),var(--solar));transition:width .3s ease}
.tr-status{font-size:.8rem;color:var(--muted);margin:.45rem 0 .2rem;min-height:2.4em;line-height:1.45}
.tr-status.err{color:#ffb3b3}
.tr-opt{display:flex;align-items:flex-start;gap:.45rem;font-size:.8rem;color:var(--text-2);margin:.55rem 0 0;cursor:pointer}
.tr-opt input{margin-top:.2rem;accent-color:var(--solar)}
.tr-note{font-size:.74rem;line-height:1.5;color:var(--muted);margin:.55rem 0 0}
.tr-warn{border-top:1px solid var(--line);padding-top:.55rem;color:#e6c58a}
@media (max-width:600px){
  .tr-fab{right:14px;bottom:14px;padding:.72rem;border-radius:50%}
  .tr-fab-txt{display:none}
  .tr-panel{right:0;left:0;bottom:0;width:auto;max-height:80vh;border-radius:16px 16px 0 0}
}
.tr-rtl .toc a{border-left:0;border-right:2px solid transparent;padding-left:0;padding-right:.6rem}
.tr-rtl .toc a:hover{border-right-color:var(--solar)}
.tr-rtl .note{border-left:0;border-right:4px solid var(--blue)}
.tr-rtl .note.tip{border-right-color:var(--teal)}
.tr-rtl .note.warn{border-right-color:var(--solar)}
.tr-rtl .note.danger{border-right-color:var(--red)}

/* ---------------------------- Responsive ---------------------------- */
@media (max-width:960px){
  .lesson{grid-template-columns:1fr;gap:1.6rem}
  .lesson-side{position:static;order:-1}
  .toc{font-size:.84rem}
  .toc ol{display:flex;flex-wrap:wrap;gap:.2rem}
  .toc li{width:calc(50% - .2rem)}
}
@media (max-width:760px){
  body{font-size:16px}
  .head-in{min-height:58px}
  .nav-btn{display:block}
  .nav{
    display:none;width:100%;flex-direction:column;gap:.1rem;
    margin:.2rem 0 .7rem;padding:.4rem;background:var(--panel);
    border:1px solid var(--line);border-radius:12px;
  }
  .nav.open{display:flex}
  .nav a{padding:.6rem .7rem;font-size:.95rem}
  .hero{padding-top:2rem}
  .hero-note{gap:.7rem}
  .ch-answer input{flex-basis:100%}
  .toc li{width:100%}
  .code-head{font-size:.7rem}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* ---------------------------- Enprime ---------------------------- */
@media print{
  :root{--bg:#fff;--bg-2:#fff;--panel:#fff;--panel-2:#f4f4f4;--text:#000;--text-2:#222;--muted:#555;--line:#ccc;--line-2:#bbb}
  body{background:#fff;color:#000;font-size:11pt}
  .site-head,.site-foot,.lesson-side,.finish-box,.lesson-nav,.quiz .opt,.btn,.runner,.filters{display:none!important}
  .tr-fab,.tr-panel{display:none!important}
  .lesson{display:block}
  a{color:#000;text-decoration:underline}
  .card,.tool,.quiz,.challenge,.note{border:1px solid #999;break-inside:avoid;background:#fff}
  pre,.out,.term{background:#f7f7f7;border:1px solid #ccc;color:#000}
  h2,h3{break-after:avoid}
  .page-head{border-bottom:2px solid #000}
}