:root{
  --bg:#0b0f14; --surface:#121923; --muted:#7c8b9a; --text:#e3ecf2; --accent:#ff8a00; --ok:#5bd19b; --warn:#ffb020;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0; font:14px/1.4 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu; color:var(--text); background:radial-gradient(1200px 600px at 50% -10%, #15202b 0%, var(--bg) 60%)}

.app-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:rgba(18,25,35,.7);backdrop-filter:blur(6px);border-bottom:1px solid #1c2733;position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:10px}
.title{font-weight:600;letter-spacing:.5px}
.nav{display:flex;gap:8px}
.btn{background:#1a2330;color:var(--text);border:1px solid #233041;border-radius:8px;padding:8px 12px;cursor:pointer}
.btn:hover{border-color:#2f3f53}
.btn.primary{background:linear-gradient(180deg,#ff9f3b,#ff8a00);color:#1a1103;border-color:#ff8a00}
.btn.primary:hover{filter:brightness(1.05)}
.btn.icon{padding:4px 8px}

.layout{display:grid;grid-template-columns:1fr 320px;gap:16px;max-width:1200px;margin:16px auto;padding:0 12px}
.left{min-width:0}
.right{display:flex;flex-direction:column;gap:12px}

.canvas-wrap{position:relative;background:#0b0f14;border:1px solid #1a2432;border-radius:12px;overflow:hidden}
#game{width:100%;display:block;background:#0b0f14}
.hud{position:absolute;left:10px;top:10px;display:flex;gap:12px;align-items:center}
.stat{display:flex;align-items:center;gap:6px;background:rgba(0,0,0,.35);padding:6px 8px;border-radius:8px;border:1px solid rgba(255,255,255,.05)}
.bar{width:120px;height:8px;background:#101822;border-radius:999px;overflow:hidden;border:1px solid #1e2a38}
#fuel-bar{height:100%;width:100%;background:linear-gradient(90deg,#44d28a,#ff8a00)}
.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:16px;pointer-events:none}
.card{background:#0f151e;border:1px solid #213041;border-radius:12px;max-width:520px;padding:16px;box-shadow:0 10px 40px rgba(0,0,0,.4);pointer-events:auto}
.card.hidden{display:none}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

.panels{margin-top:12px;display:grid;gap:12px}
.panel{background:#0f151e;border:1px solid #213041;border-radius:12px;padding:14px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;align-items:end}
label{display:flex;flex-direction:column;gap:6px}
input[type=text],input[type=number],select{appearance:none;background:#0c121a;color:var(--text);border:1px solid #233041;border-radius:8px;padding:8px;outline:none}
input[type=text]:focus,input[type=number]:focus,select:focus{border-color:#35506a;box-shadow:0 0 0 3px rgba(53,80,106,.35)}
.check{display:flex;align-items:center;gap:8px}
.muted{color:var(--muted)}
.warn{color:var(--warn)}
.ok{color:var(--ok)}

.lb-row{padding:6px 8px;border-bottom:1px dashed #1f2b38}
.lb-row:nth-child(odd){background:rgba(255,255,255,.02)}

.app-footer{max-width:1200px;margin:24px auto;padding:8px 12px;color:var(--muted)}

.card.mini{padding:10px}
.card.mini h4{margin:6px 0 8px}
.card.mini dl{display:grid;grid-template-columns:auto 1fr;gap:6px}

@media (max-width: 900px){
  .layout{grid-template-columns:1fr}
  .right{order:-1}
}