/* Colour tokens and base styles shared by "Mô phỏng phản ứng" (lab.html) and "Phòng thí nghiệm" (bench.html) */
:root{
  --bg:#f1f4f2; --surface:#ffffff; --ink:#13221f; --muted:#5a6b67; --line:#d3dcd8;
  --accent:#0f766e; --accent-ink:#ffffff; --accent-soft:#dcf1ee; --bad:#b4532a;
  --serif:"Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:"Figtree", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0d1614; --surface:#15211f; --ink:#e6f0ed; --muted:#93a8a3; --line:#25352f;
    --accent:#4fd1c0; --accent-ink:#04211d; --accent-soft:#12312c; --bad:#f0a070;
  }
}
:root[data-theme="dark"]{
  --bg:#0d1614; --surface:#15211f; --ink:#e6f0ed; --muted:#93a8a3; --line:#25352f;
  --accent:#4fd1c0; --accent-ink:#04211d; --accent-soft:#12312c; --bad:#f0a070;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.5}
sub{font-size:.7em;line-height:0;position:relative;top:.25em;vertical-align:baseline}
sup{font-size:.7em;line-height:0;position:relative;top:-.4em;vertical-align:baseline}
button{font:inherit;cursor:pointer;color:inherit}
.row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button[aria-pressed="true"]{background:var(--accent-soft);color:var(--ink);font-weight:600}
.chip:hover{border-color:var(--accent);background:var(--accent-soft)}