:root{
  --bg:#0d1117;
  --panel:#161b22;
  --panel-2:#1c2129;
  --line:#2a3038;
  --fg:#e6edf3;
  --muted:#8b949e;
  --accent:#3fb950;
  --accent-2:#2ea043;
  --danger:#f85149;
  --radius:10px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:radial-gradient(1100px 600px at 50% -10%, #16241c 0%, transparent 60%), var(--bg);
  color:var(--fg);
  font:15px/1.6 system-ui,-apple-system,"Segoe UI","Noto Sans SC",sans-serif;
  min-height:100vh;
}
.hidden{display:none !important}
.muted{color:var(--muted)}
.small{font-size:12.5px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;word-break:break-all;line-height:1.9}

/* ---------- brand ---------- */
.brand{display:flex;gap:14px;align-items:center}
.brand-mark{
  width:42px;height:42px;border-radius:9px;flex:0 0 auto;position:relative;
  background:linear-gradient(135deg,var(--accent) 0%,#1f6f36 100%);
  box-shadow:0 0 0 1px #3fb95040, 0 8px 22px -10px #3fb95080;
}
.brand-mark::after{
  content:"";position:absolute;inset:11px;opacity:.85;
  background:
    linear-gradient(#0d1117,#0d1117) 0 0/8px 8px no-repeat,
    linear-gradient(#0d1117,#0d1117) 8px 8px/8px 8px no-repeat,
    linear-gradient(#0d1117,#0d1117) 16px 16px/4px 4px no-repeat;
}
.brand h1{font-size:19px;margin:0;letter-spacing:.5px}
.brand p{margin:0;font-size:12.5px}
.brand.small .brand-mark{width:34px;height:34px}
.brand.small .brand-mark::after{inset:9px}
.brand.small h1{font-size:16px}

/* ---------- gate ---------- */
.gate{min-height:100vh;display:grid;place-items:center;padding:24px}
.gate-card{
  width:100%;max-width:420px;background:var(--panel);
  border:1px solid var(--line);border-radius:16px;padding:28px;
  box-shadow:0 24px 60px -30px #000;
}
.gate-card h1{font-size:20px}
.gate form{margin-top:22px;display:flex;flex-direction:column;gap:12px}
input[type=text],input[type=number],select{
  width:100%;background:var(--panel-2);border:1px solid var(--line);
  color:var(--fg);border-radius:var(--radius);padding:11px 13px;
  font:inherit;outline:none;transition:border-color .15s,box-shadow .15s;
}
select{appearance:none;cursor:pointer;
  background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;
  background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:34px}
input[type=text]{letter-spacing:2px;text-align:center;font-family:ui-monospace,monospace}
input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px #3fb95025}
button{
  background:linear-gradient(180deg,var(--accent) 0%,var(--accent-2) 100%);
  color:#04170a;border:0;border-radius:var(--radius);padding:11px 18px;
  font:inherit;font-weight:650;cursor:pointer;transition:filter .15s,transform .05s;
}
button:hover{filter:brightness(1.07)}
button:active{transform:translateY(1px)}
button:disabled{opacity:.55;cursor:not-allowed}
button.ghost{background:transparent;color:var(--fg);border:1px solid var(--line);font-weight:500}
button.ghost:hover{border-color:var(--accent);color:var(--accent)}
button.icon{padding:8px 0;width:42px;font-size:17px;line-height:1;font-weight:700}
button.mini{
  padding:4px 11px;font-size:12.5px;font-weight:500;border-radius:7px;
  background:transparent;color:var(--accent);border:1px solid var(--line);
}
button.mini:hover{border-color:var(--accent);background:#3fb95015}
.msg{min-height:20px;font-size:13px;margin:12px 0 0;color:var(--danger)}
.msg.ok{color:var(--accent)}

/* ---------- layout ---------- */
.app{max-width:1020px;margin:0 auto;padding:20px 18px 60px}
.topbar{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:6px 0 18px;border-bottom:1px solid var(--line);flex-wrap:wrap;
}
.topbar-right{display:flex;align-items:center;gap:12px}
.seed-chip{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:7px 13px;display:flex;flex-direction:column;line-height:1.25;cursor:pointer;
  transition:border-color .15s;
}
.seed-chip:hover{border-color:var(--accent)}
.seed-chip span{font-size:11px}
.seed-chip strong{font-family:ui-monospace,monospace;font-size:14px;letter-spacing:.4px}

.tabs{display:flex;gap:6px;margin:20px 0 18px;flex-wrap:wrap}
.tab{
  background:transparent;color:var(--muted);border:1px solid transparent;
  padding:9px 16px;border-radius:999px;font-weight:500;
}
.tab:hover{color:var(--fg)}
.tab.active{background:var(--panel);color:var(--accent);border-color:var(--line)}

.panel{display:none;animation:fade .18s ease}
.panel.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

.row{display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap;margin-bottom:14px}
.row label{display:flex;flex-direction:column;gap:6px;font-size:12.5px;color:var(--muted);flex:1 1 130px}
.row button{flex:0 0 auto;margin-bottom:1px}
.spawn-actions{margin-top:22px;padding-top:18px;border-top:1px solid var(--line)}

.out{margin-top:8px}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 18px;margin-bottom:12px;
}
.card h3{margin:0 0 10px;font-size:14px;color:var(--muted);font-weight:600}
.big{font-size:22px;font-weight:650;letter-spacing:.3px}
.big em{font-style:normal;color:var(--accent)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 18px;font-size:14px;margin:10px 0 0}
.kv dt{color:var(--muted)}
.kv dd{margin:0;font-family:ui-monospace,monospace}

table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:9px 10px;text-align:left;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600;font-size:12.5px}
td.num{font-family:ui-monospace,monospace}
tr:last-child td{border-bottom:0}

.empty{color:var(--muted);font-size:13.5px;padding:14px 0}
.loading{color:var(--muted);font-size:13.5px;padding:14px 0}
.loading::after{content:"";display:inline-block;width:10px;height:10px;margin-left:8px;
  border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;
  animation:spin .7s linear infinite;vertical-align:-1px}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- map ---------- */
.map-toolbar{
  display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:12px;
}
.btn-group{display:flex;gap:6px}
.map-readout{
  margin-left:auto;display:flex;gap:16px;font-size:12.5px;color:var(--muted);
  flex-wrap:wrap;
}
.map-readout b{color:var(--fg);font-family:ui-monospace,monospace;font-weight:600}

.map-wrap{
  position:relative;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);padding:1px;display:flex;justify-content:center;overflow:hidden;
}
#m-canvas{
  display:block;width:100%;height:auto;border-radius:8px;
  cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none;
}
#m-canvas:active{cursor:grabbing}
.map-status{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:rgba(0,0,0,.72);border:1px solid var(--line);border-radius:8px;
  padding:9px 16px;font-size:13px;color:var(--fg);pointer-events:none;
  opacity:0;transition:opacity .15s;
}
.map-status.show{opacity:1}
.pick{
  position:absolute;left:14px;bottom:14px;max-width:calc(100% - 28px);
  background:rgba(13,17,23,.93);border:1px solid var(--line);border-radius:10px;
  padding:11px 14px;display:none;box-shadow:0 12px 30px -14px #000;
}
.pick.show{display:block}
.pick-title{font-size:13px;color:var(--accent);font-weight:600;margin-bottom:3px}
.pick-coord{font-size:15px;font-family:ui-monospace,monospace;margin-bottom:4px}
.pick-coord b{color:var(--fg)}
.pick-actions{display:flex;gap:7px;margin-top:9px;flex-wrap:wrap}
.map-hint{margin:10px 0 0}
.legend{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:14px;font-size:12.5px;color:var(--muted)}
.legend i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.legend-title{color:var(--fg);font-weight:600;margin-right:2px}
.marker-legend{margin-top:12px}
.marker-legend:empty{display:none}

.check{
  display:inline-flex;align-items:center;gap:7px;font-size:13px;color:var(--muted);
  cursor:pointer;user-select:none;padding:9px 4px;
}
.check input{
  appearance:none;-webkit-appearance:none;width:17px;height:17px;margin:0;cursor:pointer;
  border:1px solid var(--line);border-radius:5px;background:var(--panel-2);
  position:relative;transition:border-color .15s,background .15s;padding:0;
}
.check input:checked{background:var(--accent);border-color:var(--accent)}
.check input:checked::after{
  content:"";position:absolute;left:5px;top:1.5px;width:4px;height:9px;
  border:solid #04170a;border-width:0 2px 2px 0;transform:rotate(43deg);
}
.check:hover{color:var(--fg)}

footer{margin-top:36px;padding-top:16px;border-top:1px solid var(--line);text-align:center}

.toast{
  position:fixed;left:50%;bottom:28px;transform:translate(-50%,16px);
  background:var(--panel-2);border:1px solid var(--line);color:var(--fg);
  padding:11px 18px;border-radius:var(--radius);font-size:13.5px;
  opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:99;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:620px){
  .topbar{flex-direction:column;align-items:flex-start}
  .topbar-right{width:100%;justify-content:space-between}
  .row label{flex:1 1 100%}
  .row button{width:100%}
  .seed-chip strong{font-size:13px}
  .map-readout{margin-left:0;width:100%}
  .map-toolbar button{flex:1 1 auto}
  .btn-group{flex:1 1 auto}
}