:root{
  --bg:#0b0f17;--panel:#111827;--panel2:#0f1623;--ink:#e6edf3;--mute:#8b96a8;
  --acc:#7cc4ff;--acc2:#9d7cff;--ok:#7cffb2;--warn:#ffb86b;--bad:#ff7c9c;
  --grid:#1c2638;--line:#243047;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Inter,Roboto,sans-serif;font-size:14px;line-height:1.5}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
.app{display:grid;grid-template-columns:260px 1fr;min-height:100vh}
.sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;background:linear-gradient(180deg,#0c1220,#0a0f1a);border-right:1px solid var(--line);padding:18px 14px}
.brand{font-weight:700;font-size:16px;color:var(--ink);letter-spacing:.3px;margin:4px 6px 14px}
.brand small{display:block;color:var(--mute);font-weight:400;font-size:11px;margin-top:2px}
.nav{display:flex;flex-direction:column;gap:2px}
.nav h4{font-size:10px;text-transform:uppercase;letter-spacing:1.2px;color:var(--mute);margin:14px 8px 4px;font-weight:600}
.nav a{display:block;padding:7px 10px;border-radius:6px;color:var(--ink);font-size:13px;cursor:pointer;border:1px solid transparent}
.nav a:hover{background:#15203a;text-decoration:none}
.nav a.active{background:#1a2745;border-color:#2a3a63;color:var(--acc)}
.content{padding:28px 36px;max-width:1080px}
.section{display:none;animation:fade .25s ease}
.section.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
h1{font-size:26px;margin:0 0 6px;font-weight:700}
h2{font-size:18px;margin:24px 0 8px;font-weight:600;color:var(--acc)}
h3{font-size:14px;margin:14px 0 6px;color:var(--mute);text-transform:uppercase;letter-spacing:.8px;font-weight:600}
p{color:#c5cee0;margin:6px 0 10px}
.lead{color:var(--mute);font-size:14px;max-width:780px;margin-bottom:18px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;margin:14px 0}
.card.tight{padding:12px}
.row{display:flex;flex-wrap:wrap;gap:14px;align-items:flex-start}
.row > *{flex:1 1 280px;min-width:0}
canvas{background:var(--panel2);border:1px solid var(--line);border-radius:8px;display:block;width:100%;max-width:100%;cursor:crosshair}
.canvas-wrap{position:relative}
.controls{display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center;margin-top:10px}
.ctrl{display:flex;flex-direction:column;gap:4px;min-width:130px}
.ctrl label{font-size:11px;color:var(--mute);text-transform:uppercase;letter-spacing:.6px}
.ctrl .val{color:var(--acc);font-variant-numeric:tabular-nums;font-weight:600}
input[type=range]{width:160px;accent-color:var(--acc)}
button{background:#1a2745;color:var(--ink);border:1px solid #2a3a63;padding:6px 12px;border-radius:6px;cursor:pointer;font-size:13px;font-family:inherit}
button:hover{background:#22305a}
button.primary{background:linear-gradient(180deg,#3a5fbd,#2a468f);border-color:#4a6ec7}
button.primary:hover{background:linear-gradient(180deg,#456edb,#3357a8)}
button.danger{background:#3b1a26;border-color:#6b2840;color:#ffb6c8}
select,input[type=number],input[type=text]{background:#0c1220;color:var(--ink);border:1px solid var(--line);padding:5px 8px;border-radius:5px;font-family:inherit;font-size:13px}
.kpi{display:inline-flex;flex-direction:column;background:#0c1220;border:1px solid var(--line);border-radius:6px;padding:6px 10px;margin-right:8px;min-width:90px}
.kpi b{font-size:14px;color:var(--ok);font-variant-numeric:tabular-nums}
.kpi span{font-size:10px;color:var(--mute);text-transform:uppercase;letter-spacing:.5px}
.legend{display:flex;flex-wrap:wrap;gap:10px;font-size:12px;color:var(--mute);margin-top:6px}
.legend .dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:5px;vertical-align:middle}
.tag{display:inline-block;background:#172238;border:1px solid #2a3a63;padding:2px 8px;border-radius:99px;font-size:11px;color:var(--mute);margin-right:5px}
.math{font-family:'JetBrains Mono',Consolas,Menlo,monospace;background:#0c1220;border:1px solid var(--line);padding:8px 10px;border-radius:6px;color:#cfe3ff;font-size:13px;display:inline-block;margin:6px 0}
.muted{color:var(--mute)}
hr{border:0;border-top:1px solid var(--line);margin:18px 0}
ul{padding-left:18px;color:#c5cee0}
ul li{margin:3px 0}
.hint{font-size:12px;color:var(--mute);font-style:italic;margin-top:6px}
.toolbar{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
@media(max-width:900px){
  .app{grid-template-columns:1fr}
  .sidebar{position:relative;height:auto;border-right:0;border-bottom:1px solid var(--line)}
  .content{padding:20px}
}
.footer{margin-top:30px;padding-top:14px;border-top:1px solid var(--line);color:var(--mute);font-size:12px}
.pill-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.pill-row a{background:#172238;border:1px solid #2a3a63;color:var(--ink);padding:4px 10px;border-radius:99px;font-size:12px}
.pill-row a:hover{background:#22305a;text-decoration:none}