:root{
  --bg:#fbfaf7; --fg:#1a1a1a; --muted:#5f5f5f; --line:#e3ded4;
  --accent:#1f4d3d; --warn:#8a3b1f; --win:#1c6b4a; --card:#fff;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#14161a; --fg:#eceae5; --muted:#9aa0a6; --line:#2b2f36;
         --accent:#7fc2a4; --warn:#e0a184; --win:#7fc2a4; --card:#1b1e23; }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--fg);
  font:17px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;
}
header.site{
  display:flex; gap:20px; align-items:baseline; flex-wrap:wrap;
  padding:18px 22px; border-bottom:1px solid var(--line);
}
.brand{font-weight:700; text-decoration:none; color:var(--fg); letter-spacing:-.01em}
header nav{display:flex; gap:16px; flex-wrap:wrap}
header nav a{color:var(--muted); text-decoration:none; font-size:14.5px}
header nav a:hover{color:var(--accent)}
main{max-width:780px; margin:0 auto; padding:34px 22px 70px}
h1{font-size:2rem; line-height:1.22; letter-spacing:-.02em; margin:.2em 0 .5em}
h2{font-size:1.24rem; letter-spacing:-.01em; margin:2.2em 0 .6em; padding-top:.2em}
h3{font-size:1.02rem; margin:1.7em 0 .4em}
.lede{font-size:1.06rem; color:var(--muted); margin-bottom:1.6em}
fieldset{border:1px solid var(--line); border-radius:12px; padding:18px 20px 14px; background:var(--card); margin:0 0 18px}
legend{padding:0 8px; font-size:13px; letter-spacing:.06em; text-transform:uppercase; color:var(--muted)}
.row{display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:12px}
.row.two{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
label{display:block; font-size:13.5px; color:var(--muted); margin-bottom:2px}
input[type=number],select{
  width:100%; margin-top:5px; padding:9px 10px; font:inherit; font-size:16px;
  color:var(--fg); background:var(--bg); border:1px solid var(--line); border-radius:8px;
}
input[type=number]:focus,select:focus{outline:2px solid var(--accent); outline-offset:1px; border-color:transparent}
label.check{display:flex; gap:9px; align-items:flex-start; margin-top:16px; font-size:14px; color:var(--muted); line-height:1.5}
label.check input{width:16px; height:16px; margin-top:3px; flex:0 0 auto}
.results{margin:0 0 8px}
.cube{display:flex; align-items:baseline; gap:10px; margin-bottom:6px; flex-wrap:wrap}
.cube-num{font-size:2.5rem; font-weight:700; letter-spacing:-.03em; line-height:1; font-variant-numeric:tabular-nums}
.cube-label{font-size:14px; color:var(--muted)}
.pct{font-size:1.1rem; color:var(--muted); font-variant-numeric:tabular-nums}
table{width:100%; border-collapse:collapse; font-size:15px; background:var(--card); border:1px solid var(--line); border-radius:10px; overflow:hidden}
th,td{text-align:left; padding:10px 12px; border-bottom:1px solid var(--line); vertical-align:top}
th{font-size:12.5px; letter-spacing:.05em; text-transform:uppercase; color:var(--muted); font-weight:600}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:rgba(127,194,164,.08)}
td.num,th.num{text-align:right; font-variant-numeric:tabular-nums}
td.note{font-size:13.5px; color:var(--muted)}
.neg{color:var(--warn)}
.pos{color:var(--win)}
.foot{margin-top:14px; font-size:15px; color:var(--muted); border-left:3px solid var(--accent); padding-left:14px}
.formula{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:15px;
  background:var(--card); border:1px solid var(--line); border-radius:8px;
  padding:12px 14px; overflow-x:auto;
}
details{border-bottom:1px solid var(--line); padding:14px 0}
summary{cursor:pointer; font-weight:600; font-size:16px; list-style-position:outside}
summary:hover{color:var(--accent)}
details p{margin:.7em 0 0; color:var(--muted); font-size:15.5px}
a{color:var(--accent)}
.callout{
  border:1px solid var(--line); border-left:4px solid var(--warn); border-radius:8px;
  background:var(--card); padding:14px 16px; margin:1.6em 0; font-size:15.5px;
}
.callout strong{color:var(--warn)}
.callout p:first-child{margin-top:0}
.callout p:last-child{margin-bottom:0}
.partner{
  border:1px solid var(--line); border-radius:10px; background:var(--card);
  padding:16px 18px; margin:14px 0;
}
.partner h3{margin:0 0 4px; font-size:1.05rem}
.partner .meta{font-size:13.5px; color:var(--muted); margin:0 0 10px}
.partner ul{margin:.4em 0 .8em; padding-left:20px; font-size:15px; color:var(--muted)}
.btn{
  display:inline-block; text-decoration:none; font-size:15px; font-weight:600;
  padding:9px 16px; border-radius:8px; border:1px solid var(--accent); color:var(--accent);
}
.btn:hover{background:var(--accent); color:var(--bg)}
.updated{font-size:13px; color:var(--muted); margin-top:2.6em; border-top:1px solid var(--line); padding-top:14px}
footer.site{
  border-top:1px solid var(--line); padding:22px; font-size:13.5px; color:var(--muted);
  display:flex; gap:16px; flex-wrap:wrap; justify-content:center;
}
footer.site a{color:var(--muted); text-decoration:none}
footer.site a:hover{color:var(--accent)}
.disclosure-note{font-size:13px; color:var(--muted); font-style:italic; margin-top:8px}
@media (max-width:560px){
  h1{font-size:1.62rem}
  .cube-num{font-size:2rem}
  main{padding:26px 16px 60px}
}