:root{
  --bg:#0c1116; --panel:#141b23; --panel2:#1b242e; --line:#27323d;
  --ink:#e8eef4; --muted:#9fb0c0; --accent:#3aa6ff; --accent2:#36d399;
  --warn:#f5a623; --shadow:0 6px 24px rgba(0,0,0,.35);
  --maxw:1180px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
code{background:#0008;padding:.05em .35em;border-radius:4px;font-size:.9em}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* top bar */
.topbar{position:sticky;top:0;z-index:20;background:linear-gradient(180deg,#10171f,#0d141b);
  border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
.brand{display:flex;gap:14px;align-items:center;max-width:var(--maxw);margin:0 auto;padding:14px 20px 6px}
.logo{font-size:30px;color:var(--accent);line-height:1}
.brand h1{font-size:18px;margin:0;letter-spacing:.2px}
.sub{margin:2px 0 0;color:var(--muted);font-size:12.5px}
.tabs{display:flex;gap:4px;max-width:var(--maxw);margin:0 auto;padding:0 14px;flex-wrap:wrap}
.tabs button{background:transparent;border:none;border-bottom:2px solid transparent;color:var(--muted);
  padding:10px 14px;font-size:14px;cursor:pointer;border-radius:6px 6px 0 0}
.tabs button:hover{color:var(--ink);background:#ffffff08}
.tabs button.active{color:var(--ink);border-bottom-color:var(--accent)}

main{max-width:var(--maxw);margin:0 auto;padding:22px 20px 60px}
.tab-panel{display:none;animation:fade .2s ease}
.tab-panel.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1}}

/* prose */
.prose{max-width:860px}
.prose h2{font-size:21px;margin:30px 0 10px;border-left:3px solid var(--accent);padding-left:10px}
.prose h3{font-size:16px;margin:22px 0 8px;color:#cfe0ee}
.prose p{color:#d6e1ec}
.muted{color:var(--muted)}
.cite{font-size:13px;color:var(--muted)}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:14px 0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px}
.card h3{margin:0 0 6px;color:var(--accent2);font-size:14px}
.card p{margin:0;font-size:13px;color:var(--muted)}

.statgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:10px 0}
.statgrid .s{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:12px}
.statgrid .s b{display:block;font-size:20px;color:var(--ink)}
.statgrid .s span{font-size:12px;color:var(--muted)}

.callout{background:#1a2330;border:1px solid #2a3a4d;border-left:3px solid var(--warn);
  border-radius:8px;padding:12px 14px;margin:16px 0;font-size:13.5px;color:#d6e1ec}
.notes{color:#d6e1ec}
.notes li{margin:6px 0}

/* equations */
.eqs{display:flex;flex-direction:column;gap:8px;margin:12px 0}
.eq{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:10px 14px;overflow-x:auto}

/* tables */
table.data{width:100%;border-collapse:collapse;font-size:13px;margin:6px 0 4px}
table.data th,table.data td{border:1px solid var(--line);padding:6px 9px;text-align:left}
table.data th{background:var(--panel2);color:#cfe0ee;font-weight:600}
table.data tr:nth-child(even) td{background:#ffffff05}
table.data td.num{text-align:right;font-variant-numeric:tabular-nums}

/* map */
.map-shell{display:grid;grid-template-columns:300px 1fr;gap:14px;height:calc(100vh - 190px);min-height:520px}
.map-side{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;
  overflow-y:auto}
.side-block{margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.side-block:last-child{border-bottom:none;margin-bottom:0}
.side-h{font-size:11px;text-transform:uppercase;letter-spacing:.7px;color:var(--muted);font-weight:700}
.row{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}

.layer-list{display:flex;flex-direction:column;gap:3px;margin-top:8px;
  max-height:38vh;overflow-y:auto;padding-right:4px}
.lg-head{font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--accent2);
  margin:9px 0 3px;font-weight:700}
.lg-item{display:block;width:100%;text-align:left;background:transparent;border:1px solid transparent;
  color:#cdd9e5;padding:5px 9px;border-radius:7px;cursor:pointer;font-size:13px}
.lg-item:hover{background:#ffffff0a}
.lg-item.active{background:#16324d;border-color:var(--accent);color:#fff}

input[type=range]{width:100%;accent-color:var(--accent)}
.pet-row{display:flex;gap:8px;align-items:center;margin-top:6px}
.pet-row button{background:var(--panel2);border:1px solid var(--line);color:var(--ink);
  border-radius:7px;padding:5px 10px;cursor:pointer;font-size:13px;white-space:nowrap}
.pet-row button:hover{border-color:var(--accent)}

#legend{margin-top:8px}
.legend-bar{height:14px;border-radius:4px;border:1px solid var(--line)}
.legend-ticks{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-top:3px;
  font-variant-numeric:tabular-nums}
.legend-unit{font-size:11px;color:var(--muted);margin-top:2px}

.layer-desc{font-size:13px;color:#cdd9e5;margin:6px 0}
.layer-stats{display:flex;gap:6px;flex-wrap:wrap}
.layer-stats .chip{background:var(--panel2);border:1px solid var(--line);border-radius:6px;
  padding:3px 8px;font-size:11.5px;color:var(--muted)}
.layer-stats .chip b{color:var(--ink);font-variant-numeric:tabular-nums}

.map-wrap{position:relative;border:1px solid var(--line);border-radius:12px;overflow:hidden}
#map{position:absolute;inset:0}
.readout{position:absolute;left:12px;bottom:12px;z-index:5;background:#0d141bdd;border:1px solid var(--line);
  border-radius:8px;padding:8px 12px;font-size:13px;color:var(--ink);backdrop-filter:blur(6px);
  font-variant-numeric:tabular-nums;max-width:80%}
.readout b{color:var(--accent2)}

.foot{border-top:1px solid var(--line);color:var(--muted);font-size:12px;text-align:center;padding:16px}

@media(max-width:820px){
  .map-shell{grid-template-columns:1fr;height:auto}
  .map-side{max-height:none}
  .map-wrap{height:60vh;min-height:420px}
}