:root{--bg:#f7f6f2;--card:#fff;--ink:#1d2433;--muted:#5b6475;--line:#e3e1da;--accent:#1f5f8b;--warn:#8a5a00;--warnbg:#fff4dc;--bad:#9b2c2c;--badbg:#fdecec;--ok:#26634a;--okbg:#e6f4ec}
@media (prefers-color-scheme:dark){:root{--bg:#14171d;--card:#1c2028;--ink:#e8eaef;--muted:#a3abba;--line:#2e3440;--accent:#7cb6e0;--warn:#f0c46a;--warnbg:#3a2f16;--bad:#f3a1a1;--badbg:#3a1d1d;--ok:#8fd3b0;--okbg:#17332a}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header,main,footer{max-width:1240px;margin:0 auto;padding:0 16px}
header{padding-top:28px}h1{font-size:1.6rem;margin:0 0 6px}.tag{font-size:.75rem;font-weight:600;vertical-align:middle;background:var(--warnbg);color:var(--warn);padding:3px 8px;border-radius:99px;margin-left:6px}
.lede{color:var(--muted);margin:4px 0}#dataset{color:var(--muted);font-size:.85rem}
form{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;margin:16px 0}
fieldset{border:0;border-top:1px solid var(--line);margin:0 0 8px;padding:12px 0 4px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}
fieldset:first-of-type{border-top:0;padding-top:0}legend{font-weight:700;padding:0 6px 0 0}
label{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
input,select,button{font:inherit;color:inherit;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:7px 10px;max-width:100%}
input[name=description],input[name=question]{flex:1 1 100%}
#questions,#valuation,#chemFields{display:flex;flex-wrap:wrap;gap:10px;flex-basis:100%}
#questions label,#valuation label{flex-basis:100%;justify-content:space-between;background:var(--bg);border-radius:8px;padding:6px 10px}
.note{flex-basis:100%;color:var(--muted);font-size:.9rem;margin:0}
button{background:var(--accent);color:#fff;border:0;font-weight:700;padding:10px 22px;margin-top:8px;cursor:pointer}
button:disabled{opacity:.6;cursor:wait}
#out article{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:12px 0}
#out h2{font-size:1.1rem;margin:0 0 8px}#out h3{font-size:.95rem;margin:12px 0 4px}
.banner{display:inline-block;font-size:.85rem;background:var(--warnbg);color:var(--warn);padding:6px 10px;border-radius:8px;margin:0 6px 6px 0}
.banner.PRODUCT-RULES-CHECKED{background:var(--okbg);color:var(--ok)}
.notice{background:var(--warnbg);color:var(--warn);padding:8px 12px;border-radius:8px}
.warn{color:var(--warn)}.box{background:var(--warnbg);color:var(--warn);padding:10px 12px;border-radius:8px}
table{width:100%;border-collapse:collapse;font-size:.92rem}td{border-top:1px solid var(--line);padding:6px 4px;vertical-align:top}
td.num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums;font-weight:600}
tr.COND td{color:var(--muted);font-style:italic}tr.UNKNOWN td.num{color:var(--bad)}td.stop{color:var(--bad)}
.assumed,.timing,.attr,.src{color:var(--muted);font-size:.85rem}
#rules li{margin-bottom:6px}a{color:var(--accent)}
footer{color:var(--muted);font-size:.85rem;padding-bottom:32px}
@media (max-width:600px){h1{font-size:1.3rem}#questions label,#valuation label{flex-direction:column;align-items:flex-start}}

label.amount{flex-basis:100%;padding:0 10px}label.amount input{width:160px}
#plasticRow{flex-basis:100%}
.submit{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}.submit input{flex:1 1 280px}.submit button{margin-top:0}
input[name=description]{flex:1 1 100%}

[hidden]{display:none !important}

.rulerow{display:flex;flex-wrap:wrap;gap:10px;align-items:center;flex-basis:100%}
.hint{color:var(--muted);font-size:.9rem}.sub{color:var(--muted);font-size:.85rem;font-weight:400}
.linkbtn{background:none;color:var(--accent);border:0;padding:0;margin:0;font-weight:700;text-decoration:underline;cursor:pointer}
.explainer{flex-basis:100%;margin:0;background:var(--bg);border-left:3px solid var(--accent);padding:8px 12px;border-radius:6px;font-size:.92rem}
label.wide{flex:1 1 360px}label.wide input{flex:1}
details{flex-basis:100%}summary{cursor:pointer;color:var(--accent);font-weight:600;padding:4px 0}
details label{margin:6px 0}
#valuation details label{flex-basis:100%;justify-content:space-between;background:var(--bg);border-radius:8px;padding:6px 10px}

.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px;align-items:start}
.maincol{grid-column:1;grid-row:1;min-width:0}
#guide{grid-column:2;grid-row:1;position:sticky;top:12px;max-height:calc(100vh - 24px);overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-top:16px}
#guide summary{list-style:none}#guide summary::-webkit-details-marker{display:none}
#guide h2{font-size:1.05rem;margin:0;display:inline}#guide h3{font-size:.85rem;color:var(--muted);margin:14px 0 6px;text-transform:none}
.rulecard{display:block;width:100%;text-align:left;background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:8px 10px;margin:0 0 6px;font-weight:400;cursor:pointer}
.rulecard b{color:var(--accent)}.rulecard small{display:block;color:var(--muted);font-size:.82rem;margin-top:2px}
.rulecard em{font-style:normal;font-size:.72rem;background:var(--okbg);color:var(--ok);padding:1px 6px;border-radius:99px}
.rulecard i{font-style:normal;font-size:.72rem;color:var(--muted)}
.rulecard.on{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent) inset}
.rulecard.off{opacity:.5;cursor:not-allowed}
@media (max-width:900px){.layout{grid-template-columns:1fr}#guide{grid-column:1;grid-row:auto;position:static;max-height:none}.maincol{grid-row:auto}#guide details:not([open]) .body{display:none}}

fieldset{min-width:0}
@media (max-width:600px){label{width:100%}label select,label input{min-width:0;flex:1 1 auto}#spec{width:100%}}