/* Chemistry Games — khung visual chung cho mọi game trong public/games/.
   Phong cách "neubrutalist" vui nhộn: nền tối, viền đậm, bóng đổ cứng, bo góc lớn.
   Mỗi game có <style> riêng cho gameplay; file này lo phần khung xương. */

:root{
  --ink:#1d1b38; --panel:#2b2d5c; --panel2:#3a3d75; --yellow:#ffcf3f; --pink:#ff5d8f;
  --green:#3ddc97; --sky:#4cc9f0; --orange:#ff9f45; --text:#ffffff; --muted:#b9bbe6;
}
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:"Baloo 2",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--text);
  background:radial-gradient(1200px 600px at 50% -10%,#3b3f86 0%,#1d1b38 60%) fixed;min-height:100vh}
.game{max-width:1120px;margin:0 auto;padding:10px 12px 18px}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.brand{font-weight:800;font-size:1.45rem;letter-spacing:.3px;text-shadow:0 3px 0 var(--ink)}
.stats,.tools{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.chip{background:var(--panel);border:2px solid var(--ink);border-radius:999px;padding:2px 12px;font-weight:700;box-shadow:0 3px 0 var(--ink)}
.hearts{font-size:1.15rem;letter-spacing:2px}
.icon{width:40px;height:40px;border-radius:12px;border:2px solid var(--ink);background:var(--panel2);color:#fff;font-size:1.1rem;cursor:pointer;box-shadow:0 3px 0 var(--ink)}
.seg{display:flex}
.seg button{background:var(--panel2);color:#fff;border:2px solid var(--ink);padding:6px 10px;font:700 .9rem "Baloo 2",system-ui,sans-serif;cursor:pointer}
.seg button:first-child{border-radius:10px 0 0 10px}.seg button:last-child{border-radius:0 10px 10px 0;border-left:0}
.seg button.on{background:var(--yellow);color:var(--ink)}
.kchip{display:inline-block;background:#efeefe;border:2px solid var(--ink);border-radius:999px;padding:4px 12px;font:700 .95rem "Baloo 2",system-ui,sans-serif;color:var(--ink);cursor:pointer;margin:3px}
.kchip:hover{background:var(--yellow)}
button:focus-visible,input:focus-visible{outline:3px solid var(--sky);outline-offset:2px}
.stage{position:relative;border:4px solid var(--ink);border-radius:18px;overflow:hidden;box-shadow:0 8px 0 var(--ink);background:#000}
canvas{display:block;width:100%;aspect-ratio:16/9;touch-action:none;cursor:crosshair}
.hud{position:absolute;left:10px;top:10px;display:flex;gap:6px;flex-wrap:wrap;pointer-events:none;max-width:75%}
.hud .chip{font-size:.85rem;background:rgba(29,27,56,.78)}
.toast{position:absolute;left:50%;bottom:14px;transform:translate(-50%,20px);opacity:0;transition:.25s;background:rgba(29,27,56,.9);
  border:2px solid var(--ink);border-radius:12px;padding:6px 14px;font-weight:600;pointer-events:none;text-align:center;max-width:90%}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.good{background:#13795b}.toast.bad{background:#a3284f}
.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:12px;background:rgba(20,18,45,.55);backdrop-filter:blur(3px)}
.overlay.hidden{display:none}
.card{background:#fff;color:var(--ink);border:4px solid var(--ink);border-radius:20px;box-shadow:0 8px 0 var(--ink);
  padding:18px 20px;max-width:520px;width:100%;max-height:100%;overflow:auto;animation:pop .35s cubic-bezier(.2,1.5,.4,1)}
@keyframes pop{from{transform:scale(.7);opacity:0}to{transform:scale(1);opacity:1}}
.card h2{margin:0;font-size:1.6rem;line-height:1.15}
.card h3{margin:0 0 4px;font-size:1.05rem}
.card p{margin:6px 0}
.kicker{font-weight:700;color:#6a6aa8}
.bigicon{font-size:2.6rem;line-height:1}
.tipbox{background:#e6f7ff;border:2px solid var(--ink);border-radius:12px;padding:8px 10px;margin:10px 0}
.factbox{background:#fff4d1;border:2px solid var(--ink);border-radius:12px;padding:8px 10px;margin:10px 0}
.info{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.info span{background:#efeefe;border:2px solid var(--ink);border-radius:999px;padding:1px 10px;font-weight:700;font-size:.9rem}
.btn{display:inline-block;background:var(--yellow);color:var(--ink);border:3px solid var(--ink);border-radius:14px;box-shadow:0 5px 0 var(--ink);
  padding:8px 22px;font:800 1.1rem "Baloo 2",system-ui,sans-serif;cursor:pointer;margin-top:8px}
.btn:active{transform:translateY(3px);box-shadow:0 2px 0 var(--ink)}
.btn.alt{background:#fff}
.stars{font-size:2.4rem;letter-spacing:6px}
.stars span{display:inline-block;animation:starpop .5s both}
.stars span:nth-child(2){animation-delay:.15s}.stars span:nth-child(3){animation-delay:.3s}
@keyframes starpop{0%{transform:scale(0) rotate(-90deg)}70%{transform:scale(1.3)}100%{transform:scale(1)}}
.opt{display:block;width:100%;text-align:left;margin:6px 0;padding:9px 12px;border-radius:12px;border:3px solid var(--ink);background:#f3f2ff;
  color:var(--ink);font:600 1rem "Baloo 2",system-ui,sans-serif;cursor:pointer}
.opt.right{background:#c9f7df}.opt.wrong{background:#ffd0dc}
.controls{display:grid;grid-template-columns:1fr 1fr auto;gap:12px;align-items:center;margin-top:16px;
  background:var(--panel);border:4px solid var(--ink);border-radius:18px;padding:10px 14px;box-shadow:0 6px 0 var(--ink)}
@media(max-width:700px){.controls{grid-template-columns:1fr 1fr}.controls .fire{grid-column:1/-1}}
.sl label{display:flex;justify-content:space-between;font-weight:700}
.sl b{color:var(--yellow);font-variant-numeric:tabular-nums}
.sl.locked{opacity:.55}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:12px;background:var(--ink);border-radius:999px;margin:8px 0}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:26px;height:26px;border-radius:50%;background:var(--yellow);border:3px solid var(--ink);cursor:pointer}
input[type=range]::-moz-range-thumb{width:22px;height:22px;border-radius:50%;background:var(--yellow);border:3px solid var(--ink);cursor:pointer}
input[type=number],input[type=text]{-webkit-appearance:none;appearance:none;width:100%;background:#fff;color:var(--ink);
  border:3px solid var(--ink);border-radius:10px;padding:4px 8px;font:700 1rem "Baloo 2",system-ui,sans-serif}
.fire{background:var(--pink);color:#fff;border:4px solid var(--ink);border-radius:18px;box-shadow:0 6px 0 var(--ink);padding:10px 26px;
  font:800 1.35rem "Baloo 2",system-ui,sans-serif;cursor:pointer;text-shadow:0 2px 0 var(--ink)}
.fire:active{transform:translateY(4px);box-shadow:0 2px 0 var(--ink)}
.fire:disabled{filter:grayscale(.7);opacity:.6;cursor:not-allowed}
.fire.ready{animation:pulse 1.4s infinite}
@keyframes pulse{50%{transform:scale(1.05)}}
.help{color:var(--muted);font-size:.9rem;margin:10px 4px 0}
table{width:100%;border-collapse:collapse;font-size:.85rem;font-variant-numeric:tabular-nums}
th,td{padding:3px 6px;border-bottom:2px solid #e3e2f7;text-align:right;white-space:nowrap}
th:first-child,td:first-child{text-align:left}
.formula{font-family:ui-monospace,Menlo,Consolas,monospace;background:#f3f2ff;border:2px solid var(--ink);border-radius:10px;padding:6px 8px;margin:6px 0;font-size:.85rem;overflow-x:auto}
.formula b{color:#c2185b}
.tablewrap{overflow-x:auto}
@media (prefers-reduced-motion: reduce){.card,.stars span,.fire.ready{animation:none}}

/* ===== Compact layout (như physiclabs games-compact.css) ===== */
.seg{display:none}   /* ngôn ngữ theo ?lang= của site — không cần switcher trong game */
.fire{color:#fff !important}
@media (max-width:640px){
  .game{padding:6px 6px 8px}
  .topbar{margin-bottom:4px}
  .brand{font-size:1.15rem}
  .icon{width:34px;height:34px}
  .chip{padding:1px 9px}
  .stage{border-width:3px;border-radius:14px;box-shadow:0 4px 0 var(--ink)}
  .card{max-height:94%;padding:12px 14px;border-width:3px}
  .card h2{font-size:1.3rem}
  .bigicon{font-size:2rem}
  .controls{grid-template-columns:1fr 1fr;gap:8px;padding:8px 10px;margin-top:8px;border-width:3px;box-shadow:0 4px 0 var(--ink)}
  .controls .fire{grid-column:1/-1;padding:8px 14px;font-size:1.15rem}
  .help{font-size:.8rem;margin:6px 4px 0}
  input[type=range]{height:10px;margin:5px 0}
  input[type=range]::-webkit-slider-thumb{width:22px;height:22px}
  input[type=range]::-moz-range-thumb{width:18px;height:18px}
}
body > .game-overlay-portal{position:fixed;inset:0;z-index:1000}