/* Python Concept Notes — MrQCyber
   Matches the PowerShell Ops Range shell: same palette, type, and card language. */
:root{
  --bg:#081120; --panel:#0d1b2e; --panel2:#0a1626; --line:rgba(20,224,200,.16);
  --teal:#14e0c8; --teal-dim:rgba(20,224,200,.55); --amber:#ffb347; --gold:#ffd479;
  --text:#cfe3ef; --muted:#7d95a8; --term-bg:#050b14; --err:#ff6b7a; --ok:#5fe8a0;
  --violet:#b08cff;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:'Exo 2',sans-serif;height:100vh;
  display:flex;flex-direction:column;overflow:hidden}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(20,224,200,.06),transparent 60%),
             radial-gradient(900px 500px at 10% 110%,rgba(255,179,71,.05),transparent 55%)}

/* ---------- header ---------- */
header{display:flex;align-items:center;gap:14px;padding:10px 18px;border-bottom:1px solid var(--line);
  background:var(--panel2);z-index:3;flex-wrap:wrap}
.logo{width:34px;height:34px;border:2px solid var(--teal);border-radius:6px;display:grid;place-items:center;
  font-family:'Orbitron';font-weight:900;color:var(--teal);font-size:14px;letter-spacing:1px;
  box-shadow:0 0 14px rgba(20,224,200,.25) inset,0 0 10px rgba(20,224,200,.15)}
h1{font-family:'Orbitron';font-size:15px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase}
h1 span{color:var(--teal)}
.tagline{font-size:11px;color:var(--muted);letter-spacing:1px;margin-top:2px}
.hd-right{margin-left:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
select,button.btn,a.btn{background:var(--panel);border:1px solid var(--line);color:var(--text);
  font-family:'Exo 2';font-size:12.5px;padding:7px 10px;border-radius:6px;cursor:pointer;
  display:inline-flex;align-items:center;gap:6px;text-decoration:none}
select:focus,button.btn:focus,a.btn:focus,input:focus{outline:2px solid var(--teal-dim);outline-offset:1px}
button.btn:hover,a.btn:hover{border-color:var(--teal-dim)}
button.btn.gold,a.btn.gold{color:var(--gold);border-color:rgba(255,212,121,.35)}
button.btn.teal{color:var(--teal);border-color:var(--teal-dim)}
button.btn[disabled]{opacity:.45;cursor:not-allowed}
#search{background:var(--panel);border:1px solid var(--line);color:var(--text);font-family:'Exo 2';
  font-size:12.5px;padding:7px 11px;border-radius:6px;min-width:230px}
.hitcount{font-size:11px;color:var(--muted);letter-spacing:.5px}

/* ---------- layout ---------- */
main{flex:1;display:grid;grid-template-columns:274px minmax(0,1fr) 452px;min-height:0;z-index:1}
main.runner-hidden{grid-template-columns:274px minmax(0,1fr) 0}

/* ---------- sidebar ---------- */
aside{border-right:1px solid var(--line);background:var(--panel2);overflow-y:auto;padding:14px 12px 40px}
.nav-unit{margin-bottom:12px}
.nav-unit > button{width:100%;text-align:left;background:none;border:none;color:var(--text);
  font-family:'Orbitron';font-size:10.5px;letter-spacing:1.6px;text-transform:uppercase;
  padding:7px 6px;cursor:pointer;display:flex;gap:8px;align-items:center;line-height:1.4}
.nav-unit > button:hover{color:var(--teal)}
.nav-unit .unum{color:var(--teal);flex:0 0 auto}
.nav-unit ul{list-style:none;border-left:1px solid var(--line);margin-left:8px}
.nav-unit li a{display:block;padding:4px 10px;color:var(--muted);font-size:12px;line-height:1.4;
  text-decoration:none;border-left:2px solid transparent;margin-left:-1px}
.nav-unit li a:hover{color:var(--teal);border-left-color:var(--teal)}
.nav-unit li a b{color:var(--text);font-family:Consolas,monospace;font-size:11.5px;margin-right:5px}
.nav-unit li a.active{color:var(--teal);border-left-color:var(--teal)}
.nav-unit.collapsed ul{display:none}

/* ---------- notes column ---------- */
.notes{overflow-y:auto;padding:20px 24px 90px;min-width:0}
.unit{margin-bottom:34px}
.unit-head{border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:18px}
.unit-head h2{font-family:'Orbitron';font-size:14px;letter-spacing:2px;text-transform:uppercase;color:var(--text)}
.unit-head h2 span{color:var(--teal)}
.unit-head p{font-size:12.5px;color:var(--muted);line-height:1.6;margin-top:8px;max-width:78ch}
.lesson{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px 18px;
  margin-bottom:14px;scroll-margin-top:12px}
.lesson h3{font-family:'Orbitron';font-size:12px;letter-spacing:1.6px;text-transform:uppercase;
  color:var(--gold);margin-bottom:8px;display:flex;gap:9px;align-items:baseline;flex-wrap:wrap}
.lesson h3 .lid{font-family:Consolas,monospace;color:var(--teal);font-size:12px;letter-spacing:.5px}
.obj{font-size:12.5px;color:var(--muted);line-height:1.55;padding-bottom:12px;
  border-bottom:1px dashed rgba(125,149,168,.2);margin-bottom:16px}
.obj b{color:var(--text)}
.concept{margin-bottom:22px}
.concept:last-of-type{margin-bottom:6px}
.concept > h4{font-size:14px;font-weight:600;margin-bottom:9px;color:#e6f3fa}
.codewrap{border:1px solid rgba(20,224,200,.12);border-radius:8px;overflow:hidden;margin-bottom:9px}
.codebar{background:#0b2038;display:flex;align-items:center;gap:8px;padding:5px 10px;font-size:10.5px;
  color:var(--muted);letter-spacing:1px;text-transform:uppercase;font-family:'Orbitron'}
.codebar .sp{flex:1}
.codebar button{background:none;border:1px solid var(--line);color:var(--muted);border-radius:5px;
  font-family:'Exo 2';font-size:10.5px;letter-spacing:.6px;padding:2px 9px;cursor:pointer;text-transform:none}
.codebar button:hover{color:var(--teal);border-color:var(--teal-dim)}
.codebar button.try{color:var(--teal);border-color:var(--teal-dim)}
.codebar button.try:hover{background:rgba(20,224,200,.1)}
.codebar .tagk{color:var(--amber);border:1px solid rgba(255,179,71,.35);border-radius:4px;
  padding:1px 7px;font-size:9.5px;letter-spacing:.8px}
pre{margin:0;background:var(--term-bg);color:#dbe9f2;padding:12px 14px;overflow-x:auto;
  font-family:'Cascadia Code',Consolas,monospace;font-size:12.6px;line-height:1.6;white-space:pre}
.out{border-left:2px solid var(--teal);background:rgba(20,224,200,.05);border-radius:0 7px 7px 0;
  padding:8px 12px;margin-bottom:10px}
.out .lbl{display:block;font-family:'Orbitron';font-size:9.5px;letter-spacing:1.4px;text-transform:uppercase;
  color:var(--teal);margin-bottom:3px}
.out pre{background:none;padding:0;font-size:12.2px;color:#a9dfd4;white-space:pre-wrap}
.concept p{font-size:13.2px;line-height:1.62;margin-bottom:7px}
.lbl-in{display:inline-block;font-family:'Orbitron';font-size:9.5px;letter-spacing:1.2px;text-transform:uppercase;
  padding:2px 7px;border-radius:4px;margin-right:8px;vertical-align:1px;white-space:nowrap;
  border:1px solid;background:rgba(0,0,0,.2)}
.l-does{color:var(--muted);border-color:rgba(125,149,168,.35)}
.l-use{color:var(--teal);border-color:var(--teal-dim)}
.l-syn{color:var(--amber);border-color:rgba(255,179,71,.4)}
.syn{background:rgba(255,179,71,.06);border:1px solid rgba(255,179,71,.2);border-radius:8px;padding:9px 12px;margin-top:4px}
.prac{margin-top:14px;padding-top:11px;border-top:1px dashed rgba(125,149,168,.2);
  font-size:11.8px;color:var(--muted);line-height:1.55}
.prac b{color:var(--violet);font-family:'Orbitron';font-size:9.5px;letter-spacing:1.2px;text-transform:uppercase}
code{font-family:Consolas,'Cascadia Mono',monospace;font-size:12px;color:var(--teal);
  background:rgba(20,224,200,.08);padding:1px 5px;border-radius:4px}
.syn code{color:var(--gold);background:rgba(255,179,71,.1)}
em{color:#e6f3fa;font-style:italic}
b,strong{color:#eaf6fb;font-weight:600}

/* ---------- runner ---------- */
.runner{border-left:1px solid var(--line);background:var(--panel2);display:flex;flex-direction:column;min-width:0}
main.runner-hidden .runner{display:none}
.runner-bar{display:flex;align-items:center;gap:8px;padding:8px 12px;background:#0b2038;
  border-bottom:1px solid rgba(20,224,200,.12);font-size:11px;color:var(--muted);flex-wrap:wrap}
.dots span{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:4px}
.dots span:nth-child(1){background:#ff5f57}.dots span:nth-child(2){background:#febc2e}.dots span:nth-child(3){background:#28c840}
.runner-title{font-family:Consolas,monospace;letter-spacing:.5px;color:var(--text)}
.runner-bar .sp{flex:1}
.runner-bar button{background:var(--panel);border:1px solid var(--line);color:var(--text);border-radius:5px;
  font-family:'Exo 2';font-size:11px;padding:4px 10px;cursor:pointer}
.runner-bar button:hover{border-color:var(--teal-dim)}
.runner-bar button.run{color:var(--ok);border-color:rgba(95,232,160,.4)}
.runner-bar button.stop{color:var(--err);border-color:rgba(255,107,122,.4)}
.runner-bar button[disabled]{opacity:.4;cursor:not-allowed}
.ed-label{font-family:'Orbitron';font-size:9.5px;letter-spacing:1.4px;text-transform:uppercase;
  color:var(--muted);padding:8px 14px 4px;display:flex;align-items:center;gap:8px}
.ed-label::after{content:"";flex:1;height:1px;background:var(--line)}
#editor{flex:1 1 46%;min-height:130px;background:var(--term-bg);border:none;border-top:1px solid rgba(20,224,200,.1);
  border-bottom:1px solid rgba(20,224,200,.1);color:#eaf4fb;font-family:'Cascadia Code',Consolas,monospace;
  font-size:12.8px;line-height:1.6;padding:12px 14px;resize:none;outline:none;white-space:pre;tab-size:4}
#editor:focus{box-shadow:inset 0 0 0 1px var(--teal-dim)}
.stdin-wrap{border-bottom:1px solid rgba(20,224,200,.1)}
.stdin-wrap summary{cursor:pointer;font-family:'Orbitron';font-size:9.5px;letter-spacing:1.4px;
  text-transform:uppercase;color:var(--muted);padding:7px 14px;list-style:none;display:flex;align-items:center;gap:8px}
.stdin-wrap summary::-webkit-details-marker{display:none}
.stdin-wrap summary::before{content:"▸";color:var(--teal)}
.stdin-wrap[open] summary::before{content:"▾"}
.stdin-wrap summary:hover{color:var(--teal)}
.stdin-wrap .hint{font-size:10.5px;color:var(--muted);text-transform:none;letter-spacing:0;font-family:'Exo 2'}
#stdin{width:100%;height:66px;background:var(--term-bg);border:none;border-top:1px solid rgba(20,224,200,.08);
  color:#cfe3ef;font-family:Consolas,monospace;font-size:12.2px;line-height:1.55;padding:9px 14px;resize:vertical;outline:none}
#output{flex:1 1 40%;overflow-y:auto;background:var(--term-bg);padding:11px 14px 24px;
  font-family:'Cascadia Code',Consolas,monospace;font-size:12.6px;line-height:1.55;white-space:pre-wrap;word-break:break-word}
#output .o{color:#c3d5e2}
#output .e{color:var(--err)}
#output .sys{color:var(--muted);font-style:italic}
#output .ok{color:var(--ok)}
.boot{display:flex;align-items:center;gap:9px;font-size:11.5px;color:var(--amber);padding:6px 14px;
  border-bottom:1px solid rgba(255,179,71,.16);background:rgba(255,179,71,.05)}
.boot.hide{display:none}
.spin{width:11px;height:11px;border:2px solid rgba(255,179,71,.3);border-top-color:var(--amber);
  border-radius:50%;animation:sp .8s linear infinite;flex:0 0 auto}
@keyframes sp{to{transform:rotate(360deg)}}

::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:rgba(20,224,200,.2);border-radius:5px}
::-webkit-scrollbar-track{background:transparent}

.hidden{display:none!important}
.empty{padding:40px 10px;text-align:center;color:var(--muted);font-size:13px}

/* ---------- responsive ---------- */
#runnerToggle{display:none}
@media (max-width:1240px){
  main{grid-template-columns:250px minmax(0,1fr)}
  main.runner-hidden{grid-template-columns:250px minmax(0,1fr)}
  #runnerToggle{display:inline-flex}
  .runner{position:fixed;top:0;right:0;bottom:0;width:min(460px,92vw);z-index:20;
    box-shadow:-16px 0 40px rgba(0,0,0,.55);border-left:1px solid var(--teal-dim)}
  main.runner-hidden .runner{display:none}
}
@media (max-width:880px){
  body{overflow:auto;height:auto}
  main{grid-template-columns:1fr}
  main.runner-hidden{grid-template-columns:1fr}
  aside{max-height:40vh;border-right:none;border-bottom:1px solid var(--line)}
  .notes{overflow:visible}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}