:root{
  --page:#f4f1ea; --card:#fff; --ink:#16233f; --ink2:#33415f; --muted:#6f7788;
  --gold:#b8871f; --goldSoft:#f5ecd6; --line:#e6dfd0; --green:#2f7d5b;
  --red:#b23b3b; --amber:#9a6a10; --mono:ui-monospace,SFMono-Regular,Menlo,monospace;
}
@media (prefers-color-scheme:dark){
  :root{--page:#101725;--card:#17202f;--ink:#eef2f8;--ink2:#c3ccdb;--muted:#8e9ab0;
        --gold:#d9a94a;--goldSoft:#2a2416;--line:#26314a;--green:#5fbf92;--red:#e08585;--amber:#d7a63f;}
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--page);color:var(--ink);line-height:1.45;
  font:15px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
  padding:max(env(safe-area-inset-top),12px) 14px calc(env(safe-area-inset-bottom) + 40px)}
.wrap{max-width:600px;margin:0 auto}
.tab{font-variant-numeric:tabular-nums}
header{margin:10px 2px 16px}
.eyebrow{color:var(--gold);font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}
h1{font-size:27px;line-height:1.1;margin:6px 0 4px;letter-spacing:-.02em}
.sub{color:var(--muted);font-size:13px;margin:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:14px}
.card>h2{font-size:14px;margin:0 0 12px;font-weight:650;letter-spacing:.01em}
label.f{display:block;margin-bottom:13px}
label.f>span{display:block;font-size:12px;color:var(--muted);font-weight:500;margin-bottom:5px}
input,select,textarea{width:100%;font:15px/1.4 inherit;font-family:inherit;color:var(--ink);
  padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:var(--card);
  -webkit-appearance:none;appearance:none}
select{background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:34px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px var(--goldSoft)}
input[type=range]{-webkit-appearance:none;appearance:none;padding:0;border:none;background:transparent;height:28px}
input[type=range]::-webkit-slider-runnable-track{height:5px;border-radius:99px;background:var(--line)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:22px;height:22px;
  margin-top:-8.5px;border-radius:50%;background:var(--gold);border:2px solid var(--card);
  box-shadow:0 1px 4px rgba(0,0,0,.28)}
input[type=range]::-moz-range-track{height:5px;border-radius:99px;background:var(--line)}
input[type=range]::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--gold);border:2px solid var(--card)}
/* checkboxes: the global appearance:none reset kills the native box, so draw our own */
input[type=checkbox]{width:22px;height:22px;flex:0 0 auto;padding:0;border:2px solid var(--muted);
  border-radius:6px;background:var(--card);cursor:pointer;position:relative;
  transition:background .12s ease,border-color .12s ease}
input[type=checkbox]:checked{background:var(--gold);border-color:var(--gold);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
  background-size:76% 76%;background-position:center;background-repeat:no-repeat}
input[type=checkbox]:active{transform:scale(.92)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:0 12px}
.chk{display:flex;align-items:flex-start;gap:11px;font-size:13.5px;padding:9px 10px;cursor:pointer;
  border:1px solid transparent;border-radius:10px;transition:background .12s ease,border-color .12s ease}
.chk:hover{background:var(--page)}
.chk:active{background:var(--goldSoft)}
.chk:has(input:checked){background:var(--goldSoft);border-color:var(--gold)}
.chk:has(input:checked)>span{color:var(--ink);font-weight:500}
.chk small{display:block;color:var(--muted);font-size:11.5px;font-weight:400}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg button{flex:1 1 45%;padding:10px 8px;font:500 13px inherit;font-family:inherit;
  border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink2);cursor:pointer}
.seg button.on{background:var(--ink);color:var(--page);border-color:var(--ink)}
.seg button:active,.btn:active{transform:scale(.97)}
.seg button,.btn{transition:background .12s ease,color .12s ease,transform .08s ease}
/* result */
.result{background:var(--ink);color:var(--page);border-color:var(--ink)}
.result h2{color:var(--gold)}
.big{font-size:38px;font-weight:600;letter-spacing:-.03em;margin:2px 0}
.rate{font-size:15px;color:var(--gold);font-weight:600}
.calcline{font-family:var(--mono);font-size:11.5px;color:#9fb0cd;margin-top:4px;word-break:break-word}
.kv{display:flex;justify-content:space-between;gap:12px;padding:7px 0;font-size:13.5px;border-top:1px solid rgba(255,255,255,.12)}
.kv:first-of-type{border-top:none}
.kv b{font-weight:600}
.warn{background:var(--goldSoft);border:1px solid var(--gold);color:var(--amber);
  border-radius:10px;padding:10px 12px;font-size:12.5px;margin-bottom:12px}
.err{background:rgba(178,59,59,.1);border:1px solid var(--red);color:var(--red);
  border-radius:10px;padding:10px 12px;font-size:12.5px;margin-bottom:12px}
.ok{color:var(--green)}.bad{color:var(--red)}
details.card>summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;
  align-items:center;font-size:14px;font-weight:650}
details.card>summary::-webkit-details-marker{display:none}
details.card>summary .hint{color:var(--muted);font-size:11.5px;font-weight:400}
details.card[open]>summary{margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--line)}
table{width:100%;border-collapse:collapse;font-size:12.5px}
th,td{text-align:left;padding:6px 5px;border-bottom:1px solid var(--line);vertical-align:middle}
th{color:var(--muted);font-weight:500;font-size:11px;text-transform:uppercase;letter-spacing:.04em}
td input,td select{padding:6px 7px;font-size:12.5px;border-radius:7px}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -4px}
.btn{display:inline-block;padding:9px 14px;font:600 13px inherit;font-family:inherit;border-radius:9px;
  border:1px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer;width:auto}
.btn.pri{background:var(--ink);color:var(--page);border-color:var(--ink)}
.btn.dang{color:var(--red);border-color:var(--red)}
.btn.mini{padding:5px 9px;font-size:11.5px}
.btns{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.prodhead{display:flex;justify-content:space-between;align-items:center;gap:8px;margin:18px 0 6px}
.prodhead:first-child{margin-top:0}
.prodhead h3{font-size:13px;margin:0;font-weight:650}
.foot{color:var(--muted);font-size:11.5px;line-height:1.5;margin:10px 2px 0}
.badge{display:inline-block;padding:2px 7px;border-radius:99px;font-size:10.5px;font-weight:600;
  background:var(--goldSoft);color:var(--amber);border:1px solid var(--gold)}
.badge.g{background:transparent;color:var(--green);border-color:var(--green)}
.badge.r{background:transparent;color:var(--red);border-color:var(--red)}
#lockscreen{position:fixed;inset:0;background:var(--page);z-index:99;display:none;
  align-items:center;justify-content:center;padding:24px}
#lockscreen.on{display:flex}
#lockscreen .box{max-width:320px;width:100%;text-align:center}
pre{font-family:var(--mono);font-size:11px;white-space:pre-wrap;word-break:break-word;
  background:var(--page);border:1px solid var(--line);border-radius:9px;padding:10px;max-height:260px;overflow:auto}