:root{
  --z-canvas: 0;
  --z-hud: 10;
  --z-overlay: 30;
  --z-modal: 40;
  --z-toast: 50;

  --bg: #0b132b;
  --panel: #1c2541;
  --panel-2: #3a506b;
  --accent: #5bc0be;
  --danger: #ef476f;
  --text: #e9f1f7;
  --muted: #a9c1d9;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background: radial-gradient(1000px 500px at 50% -20%, #1f2b45 0%, #0b132b 60%, #060a17 100%) fixed;
  color:var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  overflow:hidden;
}
#game{position:fixed; inset:0; width:100vw; height:100vh; display:block}

#overlay{
  position:fixed; inset:0; display:flex; align-items:center; justify-content:center; flex-direction:column;
  gap:24px; background: linear-gradient(180deg, rgba(6,10,23,0.9), rgba(6,10,23,0.6) 60%, rgba(6,10,23,0.9));
  backdrop-filter: blur(6px);
}
.logo{
  font-size: clamp(28px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: 1px;
  text-shadow: 0 10px 30px rgba(0,0,0,.6);
}
.btn-row{display:flex; gap:12px; flex-wrap:wrap; justify-content:center}
.btn{
  appearance:none; border:none; padding:12px 16px; border-radius:14px;
  background:var(--panel-2); color:var(--text); font-weight:700; cursor:pointer;
  box-shadow: 0 10px 24px rgba(0,0,0,.25), inset 0 0 0 1px rgba(255,255,255,.05);
  transition: transform .08s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover{transform: translateY(-1px)}
.btn:active{transform: translateY(0)}
.btn.primary{background: linear-gradient(180deg, var(--accent), #3db2b0)}
.btn.danger{background: linear-gradient(180deg, var(--danger), #d3375a)}

.hud{
  position:fixed; inset:0; pointer-events:none; padding:16px; display:grid;
  grid-template-columns: 1fr auto 1fr; align-items:start;
}
.hud .left, .hud .right{display:flex; flex-direction:column; gap:8px}
.hud .center{display:flex; justify-content:center; align-items:flex-start}

.bar{
  position:relative; width:260px; height:14px; border-radius:999px;
  background: rgba(255,255,255,.06);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.06), 0 6px 20px rgba(0,0,0,.35);
}
.bar::before{
  content: attr(data-label); position:absolute; left:10px; top:-22px; font-size:12px; color: var(--muted);
}
.bar::after{
  content:""; position:absolute; left:0; top:0; bottom:0; width: var(--fill, 50%); border-radius:999px;
  background: linear-gradient(90deg, rgba(255,255,255,.12), rgba(255,255,255,.0) 40%),
              linear-gradient(180deg, #89e5ff, #4bb3ff);
  box-shadow: 0 6px 16px rgba(0,150,255,.25);
}

.interaction{
  pointer-events:auto;
  background: rgba(0,0,0,.35); padding:8px 12px; border-radius:10px; backdrop-filter: blur(6px);
  display:none; margin-top:6px; font-size:14px; box-shadow: inset 0 0 0 1px rgba(255,255,255,.06);
}
.interaction.show{display:block}

.clock{font-weight:700; text-align:right}
.inventory{
  display:flex; gap:8px; flex-wrap:wrap; justify-content:flex-end;
}
.inv-chip{
  background: rgba(255,255,255,.06); padding:6px 10px; border-radius:999px; font-size:13px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.06);
}

.modal{
  position:fixed; inset:0; display:flex; align-items:center; justify-content:center; background: rgba(0,0,0,.5);
  backdrop-filter: blur(6px);
}
.modal.hidden, .hud.hidden, #overlay.hidden{display:none}
.modal-content{
  background: linear-gradient(180deg, rgba(60,83,115,.75), rgba(33,48,76,.75));
  border-radius:20px; padding:18px; width:min(720px, 92vw);
  box-shadow: 0 20px 60px rgba(0,0,0,.35), inset 0 0 0 1px rgba(255,255,255,.08);
}
.modal-content h2{margin:6px 8px 10px 8px}
.modal-content ul{line-height:1.5}
.recipes{display:grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap:12px}
.recipe{
  padding:12px; border-radius:14px; background: rgba(0,0,0,.25);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.06);
}
.recipe h3{margin:4px 0 10px 0}
.recipe .reqs{font-size:13px; color:var(--muted)}
.recipe button{margin-top:10px; pointer-events:auto}

.toast{
  position:fixed; left:50%; transform:translateX(-50%); bottom:18px; background: rgba(0,0,0,.6);
  padding:10px 14px; border-radius:999px; font-size:14px; box-shadow: inset 0 0 0 1px rgba(255,255,255,.06);
  display:none;
}
.toast.show{display:block}

/* Layering */

#game{ z-index: var(--z-canvas); }
#overlay{ z-index: var(--z-overlay); }
.hud{ z-index: var(--z-hud); }
.modal{ z-index: var(--z-modal); }
.toast{ z-index: var(--z-toast); }