/* Calm, modern look */
:root{
  --bg:#0b0e13; --bg-soft:#0f131a; --card:rgba(255,255,255,.06);
  --text:#e7e7ea; --muted:#98a0ad; --ring:#28324a;
  --accent:#7aa2ff; --accent-2:#38d39f; --ok:#38d39f;
  --shadow:0 10px 30px rgba(0,0,0,.35);
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#f6f7fb; --bg-soft:#fff; --card:rgba(0,0,0,.04);
    --text:#151922; --muted:#5b6472; --ring:#e8ecff;
    --accent:#3456ff; --accent-2:#1eae78; --ok:#1eae78; --shadow:0 10px 22px rgba(0,0,0,.10);
  }
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Arial,sans-serif}
.bg{position:fixed;inset:0;background:
  radial-gradient(1200px 600px at 20% 10%, #121826, transparent),
  radial-gradient(1200px 600px at 80% 90%, #10141c, transparent);
  pointer-events:none}
.shell{max-width:780px;margin:0 auto;padding:16px}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.brand{display:flex;align-items:center;gap:10px}
.logo{width:36px;height:36px;display:grid;place-items:center;background:var(--card);border-radius:12px;box-shadow:var(--shadow)}
h1{margin:0;font-size:24px}
.icon-btn{background:var(--card);border:1px solid var(--ring);border-radius:12px;color:var(--text);padding:8px 10px;cursor:pointer;box-shadow:var(--shadow);transition:transform .08s}
.icon-btn:active{transform:scale(.98)}

.card{position:relative;border:1px solid var(--ring);background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));border-radius:16px;padding:12px;box-shadow:var(--shadow);backdrop-filter: blur(6px)}
.intro .stats{display:flex;gap:12px;flex-wrap:wrap;margin-top:8px}
.stat{flex:1;min-width:120px;background:var(--bg-soft);border:1px solid var(--ring);border-radius:12px;padding:10px;text-align:center}
.stat .label{display:block;font-size:12px;color:var(--muted)}
.stat .value{font-weight:700;font-size:18px}

.stage{margin-top:8px}
.board-wrap{display:grid;place-items:center;margin:8px 0}
#board{width:100%;max-width:420px;background:#0a0e14;border-radius:12px;border:1px solid var(--ring)}

.hud{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:6px}
.pill{background:var(--bg-soft);border:1px solid var(--ring);border-radius:999px;padding:6px 10px;font-size:12px}

.controls{display:flex;gap:8px;justify-content:center;margin-top:8px}
.primary{background:linear-gradient(180deg, var(--accent), #4e7dff);border:none;color:white;padding:10px 14px;border-radius:12px;cursor:pointer;box-shadow:var(--shadow)}
.secondary{background:var(--card);border:1px solid var(--ring);color:var(--text);padding:10px 14px;border-radius:12px;cursor:pointer}
.ghost{background:transparent;border:1px dashed var(--ring);color:var(--text);padding:10px 14px;border-radius:12px;cursor:pointer}

.tabs{display:flex;gap:6px;justify-content:center;margin-bottom:8px}
.tab{background:var(--card);border:1px solid var(--ring);color:var(--text);padding:8px 10px;border-radius:12px;cursor:pointer}
.tab.active{outline:2px solid var(--accent)}

.overlay{position:absolute;inset:0;display:grid;place-items:center;background:rgba(0,0,0,.35);border-radius:16px}
.overlay .panel{background:var(--bg-soft);border:1px solid var(--ring);border-radius:16px;padding:16px;max-width:90%;text-align:center}
.hidden{display:none}

.foot{text-align:center;opacity:.8;margin-top:10px}
.tiny{font-size:12px}.muted{color:var(--muted)}