:root{--bg:#EEF2F0;--surface:#fff;--ink:#13201A;--muted:#5B6B63;--line:#D5DED9;--accent:#1E6B47}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0F1613;--surface:#17211C;--ink:#E4ECE7;--muted:#93A59B;--line:#2A3832;--accent:#5CC48E}}
:root[data-theme="dark"]{--bg:#0F1613;--surface:#17211C;--ink:#E4ECE7;--muted:#93A59B;--line:#2A3832;--accent:#5CC48E}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 "IBM Plex Sans",ui-sans-serif,system-ui,sans-serif;
  padding:calc(env(safe-area-inset-top) + 12px) max(16px,env(safe-area-inset-left)) calc(env(safe-area-inset-bottom) + 40px)}
main{max-width:680px;margin:0 auto}
.back{position:sticky;top:0;display:inline-flex;align-items:center;gap:6px;padding:10px 0;color:var(--accent);font-weight:600;text-decoration:none;background:var(--bg)}
h1{font-family:"Bricolage Grotesque",ui-sans-serif,system-ui,sans-serif;font-size:1.9rem;line-height:1.15;margin:8px 0 4px;letter-spacing:-.02em}
.meta{color:var(--muted);font-size:.9rem;margin:0 0 20px}
section{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:4px 18px 10px;margin:14px 0}
h2{font-size:1.05rem;margin:14px 0 4px}
p,li{color:var(--ink)} ul{padding-left:20px;margin:6px 0}
.note{background:transparent;border-style:dashed;color:var(--muted);font-size:.9rem}
a{color:var(--accent)}
table{width:100%;border-collapse:collapse;font-size:.9rem;margin:8px 0} td,th{text-align:left;padding:6px 4px;border-top:1px solid var(--line);vertical-align:top}
/* Back button: a normal rounded button in a solid top bar (nothing shows through) */
body{padding-top:0}
.topbar{position:sticky;top:0;z-index:5;margin:0 calc(-1 * max(16px,env(safe-area-inset-left)));
  padding:calc(env(safe-area-inset-top) + 8px) max(16px,env(safe-area-inset-left)) 10px;background:var(--bg);border-bottom:1px solid var(--line)}
.back{position:static;display:inline-flex;align-items:center;gap:4px;min-height:40px;padding:0 16px 0 10px;border-radius:999px;
  background:var(--surface);border:1px solid var(--line);color:var(--ink);font-weight:600;font-size:.95rem;text-decoration:none}
.back svg{width:18px;height:18px;fill:none;stroke:var(--accent);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.back:active{transform:scale(.98)}
h1{margin-top:18px}