:root{
  --bg:#0b1020; --panel:#121a30; --panel2:#0e1528; --border:#22304d;
  --text:#e6ecf7; --muted:#8da2c4; --accent:#3b82f6; --accent2:#22d3ee;
  --green:#22c55e; --yellow:#eab308; --red:#ef4444; --purple:#a78bfa;
  --term-bg:#0a0e1a; --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:radial-gradient(1200px 600px at 80% -10%,#16224a 0%,var(--bg) 55%);
  color:var(--text); font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif; font-size:14px;
}
header{
  display:flex; align-items:center; gap:14px; padding:12px 18px;
  border-bottom:1px solid var(--border); background:rgba(10,14,26,.6); backdrop-filter:blur(6px);
  position:sticky; top:0; z-index:20;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;letter-spacing:.3px}
.logo .wheel{width:26px;height:26px;color:var(--accent2)}
/* centered engine switcher */
.engine-switch{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  display:flex;gap:2px;background:var(--panel2);border:1px solid var(--border);
  border-radius:11px;padding:3px;z-index:1;
}
.engine-switch button{
  display:flex;align-items:center;gap:6px;background:transparent;border:none;color:var(--muted);
  font-family:inherit;font-size:12.5px;font-weight:600;padding:6px 14px;border-radius:8px;cursor:pointer;
  white-space:nowrap;transition:background .15s,color .15s;
}
.engine-switch button:hover{color:var(--text)}
.engine-switch button.active{background:var(--accent);color:#fff;box-shadow:0 2px 10px rgba(0,0,0,.3)}
.engine-switch .ico{font-size:14px;line-height:1}
.ns-badge{margin-left:auto;display:flex;gap:10px;align-items:center;font-size:12px;color:var(--muted)}
@media(max-width:1024px){
  .engine-switch{position:static;transform:none;margin:0 auto}
  .engine-switch button span:not(.ico){display:none}
  .engine-switch button{padding:6px 10px}
}
.ns-badge b{color:var(--accent2)}
.pill{background:var(--panel);border:1px solid var(--border);padding:4px 10px;border-radius:999px}
nav{display:flex;gap:4px;padding:10px 18px 0;border-bottom:1px solid var(--border);background:rgba(10,14,26,.35)}
nav button{
  background:transparent;border:none;color:var(--muted);padding:9px 16px;cursor:pointer;
  border-radius:8px 8px 0 0;font-size:13px;font-weight:600;border-bottom:2px solid transparent;
}
nav button:hover{color:var(--text)}
nav button.active{color:var(--text);border-bottom-color:var(--accent);background:var(--panel)}
main{padding:18px;max-width:1280px;margin:0 auto}
.view{display:none}
.view.active{display:block;animation:fade .2s ease}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1}}

/* Terminal */
.term-wrap{display:grid;grid-template-columns:1fr;gap:14px}
.terminal{
  background:var(--term-bg);border:1px solid var(--border);border-radius:12px;overflow:hidden;
  box-shadow:0 20px 50px rgba(0,0,0,.35);
}
.term-bar{display:flex;align-items:center;gap:8px;padding:10px 14px;background:#070b15;border-bottom:1px solid var(--border)}
.dot{width:12px;height:12px;border-radius:50%}
.dot.r{background:#ff5f57}.dot.y{background:#febc2e}.dot.g{background:#28c840}
.term-title{margin-left:8px;color:var(--muted);font-size:12px;font-family:var(--mono)}
.term-body{height:52vh;min-height:340px;overflow-y:auto;padding:14px;font-family:var(--mono);font-size:13px;line-height:1.5}
.term-body pre{margin:0;white-space:pre-wrap;word-break:break-word}
.line-prompt{color:var(--accent2)}
.line-prompt .path{color:var(--purple)}
.out-ok{color:var(--green)} .out-err{color:var(--red)} .out-muted{color:var(--muted)} .out-warn{color:var(--yellow)}
.term-input-row{display:flex;align-items:center;gap:8px;padding:10px 14px;border-top:1px solid var(--border);background:#070b15}
.term-input-row .ps{color:var(--accent2);font-family:var(--mono);font-size:13px;white-space:nowrap}
.term-input-row .ps .path{color:var(--purple)}
#cmd{flex:1;background:transparent;border:none;outline:none;color:var(--text);font-family:var(--mono);font-size:13px}
.table-hd{color:var(--muted)}
.quickcmds{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
.quickcmds button{
  background:var(--panel);border:1px solid var(--border);color:var(--muted);font-family:var(--mono);
  font-size:11px;padding:5px 9px;border-radius:6px;cursor:pointer
}
.quickcmds button:hover{color:var(--text);border-color:var(--accent)}

/* Cluster view */
.cluster-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.node-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:14px}
.node-card h3{margin:0 0 4px;display:flex;align-items:center;gap:8px;font-size:15px}
.node-meta{color:var(--muted);font-size:11px;margin-bottom:12px;font-family:var(--mono)}
.pods{display:flex;flex-wrap:wrap;gap:8px}
.pod{
  width:84px;border-radius:10px;border:1px solid var(--border);background:var(--panel2);padding:8px;
  text-align:center;position:relative;transition:transform .15s
}
.pod:hover{transform:translateY(-3px);border-color:var(--accent)}
.pod .box{width:34px;height:34px;margin:0 auto 6px;border-radius:8px;display:flex;align-items:center;justify-content:center}
.pod .nm{font-family:var(--mono);font-size:9px;color:var(--muted);word-break:break-all;line-height:1.2}
.pod .st{font-size:9px;margin-top:3px;font-weight:600}
.s-Running{color:var(--green)} .s-Pending{color:var(--yellow)} .s-Terminating{color:var(--red)} .s-CrashLoopBackOff{color:var(--red)}
.bg-Running{background:rgba(34,197,94,.18);border:1px solid var(--green)}
.bg-Pending{background:rgba(234,179,8,.18);border:1px solid var(--yellow)}
.bg-Terminating{background:rgba(239,68,68,.18);border:1px solid var(--red)}
.bg-CrashLoopBackOff{background:rgba(239,68,68,.18);border:1px solid var(--red)}
.empty-note{color:var(--muted);font-style:italic;font-size:12px}
.legend{display:flex;gap:16px;flex-wrap:wrap;margin:0 0 16px;color:var(--muted);font-size:12px}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:12px;height:12px;border-radius:3px;display:inline-block}
.res-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:16px}
.res-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:14px}
.res-card h4{margin:0 0 10px;font-size:13px;color:var(--accent2);text-transform:uppercase;letter-spacing:.5px}
.res-item{font-family:var(--mono);font-size:12px;padding:6px 0;border-bottom:1px dashed var(--border);display:flex;justify-content:space-between;gap:8px}
.res-item:last-child{border:none}

/* Lessons */
.lessons-layout{display:grid;grid-template-columns:280px 1fr;gap:16px}
.modules{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:8px;height:fit-content}
.modules h3{font-size:12px;text-transform:uppercase;color:var(--muted);letter-spacing:.5px;padding:8px 10px 4px;margin:0}
.mod-btn{display:flex;align-items:center;gap:8px;width:100%;text-align:left;background:transparent;border:none;color:var(--text);padding:10px;border-radius:8px;cursor:pointer;font-size:13px}
.mod-btn:hover{background:var(--panel2)}
.mod-btn.active{background:var(--accent);color:#fff}
.mod-btn .chk{margin-left:auto;font-size:12px}
.lesson-panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px}
.lesson-panel h2{margin:0 0 6px}
.lesson-desc{color:var(--muted);margin-bottom:18px;line-height:1.6}
.step{border:1px solid var(--border);border-radius:10px;padding:14px;margin-bottom:12px;background:var(--panel2)}
.step.done{border-color:var(--green)}
.step-hd{display:flex;align-items:center;gap:10px;font-weight:600}
.step-hd .num{width:24px;height:24px;border-radius:50%;background:var(--border);display:flex;align-items:center;justify-content:center;font-size:12px;flex:0 0 auto}
.step.done .num{background:var(--green);color:#04210f}
.step-task{margin:10px 0 8px;line-height:1.55}
.step code,.cheat code,.lesson-desc code{background:#000;padding:2px 6px;border-radius:5px;font-family:var(--mono);font-size:12px;color:var(--accent2)}
.hint{font-size:12px;color:var(--muted)}
.hint summary{cursor:pointer;color:var(--yellow)}
.progress-bar{height:8px;background:var(--panel2);border-radius:99px;overflow:hidden;margin:6px 0 18px}
.progress-bar > div{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));width:0;transition:width .4s}
.badge-done{background:rgba(34,197,94,.15);color:var(--green);border:1px solid var(--green);padding:2px 8px;border-radius:99px;font-size:11px;margin-left:auto}

/* YAML */
.yaml-layout{display:grid;grid-template-columns:1fr 1fr;gap:16px}
textarea#yaml{width:100%;height:52vh;background:var(--term-bg);color:var(--text);border:1px solid var(--border);border-radius:12px;padding:14px;font-family:var(--mono);font-size:13px;resize:vertical;line-height:1.5}
.yaml-out{background:var(--term-bg);border:1px solid var(--border);border-radius:12px;padding:14px;font-family:var(--mono);font-size:12px;height:52vh;overflow:auto;white-space:pre-wrap}
.btn{background:var(--accent);color:#fff;border:none;padding:9px 16px;border-radius:8px;font-weight:600;cursor:pointer;font-size:13px}
.btn:hover{filter:brightness(1.1)}
.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--muted)}
.btn.ghost:hover{color:var(--text);border-color:var(--accent)}
.row{display:flex;gap:8px;align-items:center;margin-bottom:10px;flex-wrap:wrap}
.sample-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}
.sample-tabs button{background:var(--panel);border:1px solid var(--border);color:var(--muted);font-size:11px;padding:5px 9px;border-radius:6px;cursor:pointer;font-family:var(--mono)}
.sample-tabs button:hover{color:var(--text);border-color:var(--accent)}

/* Cheatsheet */
.cheat{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.cheat .grp{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:16px}
.cheat .grp h4{margin:0 0 12px;color:var(--accent2);font-size:13px;text-transform:uppercase;letter-spacing:.5px}
.cheat .c-item{padding:7px 0;border-bottom:1px dashed var(--border)}
.cheat .c-item:last-child{border:none}
.cheat .c-item .cmd{font-family:var(--mono);font-size:12px;color:var(--text)}
.cheat .c-item .desc{font-size:11px;color:var(--muted);margin-top:2px}

.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--green);color:#04210f;padding:10px 18px;border-radius:10px;font-weight:600;box-shadow:0 10px 30px rgba(0,0,0,.4);opacity:0;pointer-events:none;transition:opacity .3s,transform .3s;z-index:50}
.toast.show{opacity:1;transform:translateX(-50%) translateY(-6px)}
.footnote{color:var(--muted);font-size:11px;text-align:center;padding:20px 0 6px}
@media(max-width:860px){.lessons-layout,.yaml-layout{grid-template-columns:1fr}}