:root{--paper:#fbf7ee;--card:#fff;--ink:#1c2a24;--muted:#5b6b63;--line:#e6dfcd;--green:#17594a;--green-2:#0f4236;--green-soft:#e3f0ea;--red:#c2410c;--red-soft:#fff1e8;--mark:#ffe58a;--blue:#1d4ed8;--r:14px;--shadow:0 1px 2px rgba(28,42,36,.06),0 6px 20px rgba(28,42,36,.06);--serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;--sans:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",Arial,sans-serif}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--paper:#131a17;--card:#1b2420;--ink:#ecf2ee;--muted:#a6b5ad;--line:#2d3a34;--green:#5fc7a6;--green-2:#86dcc0;--green-soft:#1c332b;--red:#ff8a5b;--red-soft:#33211a;--mark:#5c4d14;--shadow:none}}
:root[data-theme=dark]{--paper:#131a17;--card:#1b2420;--ink:#ecf2ee;--muted:#a6b5ad;--line:#2d3a34;--green:#5fc7a6;--green-2:#86dcc0;--green-soft:#1c332b;--red:#ff8a5b;--red-soft:#33211a;--mark:#5c4d14;--shadow:none}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--sans)}
a{color:var(--green)}a:hover{color:var(--red)}
img,svg{max-width:100%}
h1,h2,h3{font-family:var(--serif);line-height:1.25;letter-spacing:-.01em}
h1{font-size:clamp(1.6rem,4.5vw,2.3rem);margin:.2em 0 .3em}
h2{font-size:1.4rem;margin:1.8em 0 .5em}
h3{font-size:1.1rem;margin:1.2em 0 .4em}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:9}
/* header */
.top{background:var(--green-2);color:#fff;border-bottom:4px solid var(--red)}
:root[data-theme=dark] .top{background:#0c2a22}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .top{background:#0c2a22}}
.top .wrap{display:flex;align-items:center;gap:12px;min-height:60px}
.logo{display:flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-family:var(--serif);font-weight:700;font-size:1.3rem}
.logo:hover{color:#fff}.logo b{color:var(--mark);font-weight:700}
:root[data-theme=dark] .logo b{color:#ffd84d}
.logo svg{width:34px;height:34px;flex:none}
.nav{margin-left:auto;display:flex;gap:4px;align-items:center}
.nav a{color:#e9f5ef;text-decoration:none;padding:8px 10px;border-radius:8px;font-size:.95rem}
.nav a:hover{background:rgba(255,255,255,.1);color:#fff}
.theme-btn{background:transparent;border:1px solid rgba(255,255,255,.35);color:#fff;border-radius:8px;padding:6px 9px;cursor:pointer;font-size:1rem}
@media (max-width:720px){.nav a.hide-m{display:none}}
/* breadcrumbs */
.crumbs{font-size:.85rem;color:var(--muted);margin:14px 0 0}
.crumbs a{color:var(--muted)}
.lead{color:var(--muted);font-size:1.05rem;margin:0 0 16px;max-width:70ch}
/* tool card */
.tool{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;margin:8px 0 20px;position:relative}
.tool::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:4px;border-radius:0 4px 4px 0;background:var(--red);opacity:.85}
.row{display:flex;flex-wrap:wrap;gap:12px}
.row>*{flex:1 1 160px}
label{display:block;font-weight:600;font-size:.92rem;margin-bottom:4px}
.hint{font-weight:400;color:var(--muted);font-size:.84rem}
input,select,textarea{width:100%;font:inherit;color:var(--ink);background:var(--paper);border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;min-height:46px}
textarea{min-height:90px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:3px solid color-mix(in srgb,var(--green) 30%,transparent);border-color:var(--green)}
input[type=checkbox]{width:auto;min-height:0}
.btn{display:inline-flex;align-items:center;gap:6px;justify-content:center;font:600 1rem var(--sans);border-radius:10px;padding:11px 16px;min-height:46px;border:1.5px solid var(--green);background:var(--green);color:#fff;cursor:pointer;text-decoration:none}
:root[data-theme=dark] .btn{color:#0c2a22}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .btn{color:#0c2a22}}
.btn:hover{filter:brightness(1.08);color:#fff}
.btn.ghost{background:transparent;color:var(--green)}
.btn.warn{background:transparent;border-color:var(--red);color:var(--red)}
.btn.sm{padding:6px 10px;min-height:38px;font-size:.9rem}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.icon-btn{background:transparent;border:0;color:var(--red);font-size:1.3rem;cursor:pointer;min-width:40px;min-height:40px;border-radius:8px}
.icon-btn:hover{background:var(--red-soft)}
/* tables */
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:8px -4px}
table.grid{border-collapse:collapse;width:100%;min-width:100%}
table.grid th,table.grid td{padding:6px 4px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
table.grid th{font-size:.82rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.03em}
table.grid input,table.grid select{min-height:42px;padding:8px}
table.grid td.num,table.grid th.num{text-align:right;font-variant-numeric:tabular-nums}
table.data{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
table.data th,table.data td{padding:8px 10px;border:1px solid var(--line);text-align:left}
table.data th{background:var(--green-soft)}
/* results */
.result{margin-top:16px;border-radius:12px;background:var(--green-soft);padding:14px 16px;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.result:empty{display:none}
.stat{min-width:0}
.stat .k{font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-weight:600}
.stat .v{font-family:var(--serif);font-size:1.9rem;font-weight:700;line-height:1.15;color:var(--green-2);word-break:break-word}
.stat .v.sm{font-size:1.25rem}
.stamp{display:inline-block;border:2.5px solid var(--red);color:var(--red);border-radius:8px;padding:2px 10px;font-weight:800;transform:rotate(-2deg);font-family:var(--serif);background:var(--card)}
.note{font-size:.88rem;color:var(--muted);margin-top:10px}
.alert{background:var(--red-soft);border-left:4px solid var(--red);padding:10px 12px;border-radius:8px;margin-top:12px}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.tabs button{font:600 .92rem var(--sans);border:1.5px solid var(--line);background:var(--paper);color:var(--ink);border-radius:999px;padding:8px 14px;cursor:pointer;min-height:40px}
.tabs button[aria-selected=true]{background:var(--green);border-color:var(--green);color:#fff}
:root[data-theme=dark] .tabs button[aria-selected=true]{color:#0c2a22}
.sem{border:1px dashed var(--line);border-radius:12px;padding:12px;margin:10px 0}
.sem-h{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.sem-h h3{margin:0}
.pill{display:inline-block;background:var(--mark);color:var(--ink);border-radius:999px;padding:2px 10px;font-weight:700;font-size:.9rem}
.saved{font-size:.8rem;color:var(--muted)}
/* content */
.content{max-width:760px}
.content p,.content li{max-width:72ch}
.formula{font-family:ui-monospace,Menlo,Consolas,monospace;background:var(--card);border:1px solid var(--line);border-left:4px solid var(--green);padding:10px 14px;border-radius:8px;overflow-x:auto;white-space:pre-wrap}
mark{background:var(--mark);color:inherit;padding:0 3px;border-radius:3px}
details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:0 14px;margin:8px 0}
details summary{cursor:pointer;font-weight:600;padding:12px 0;list-style-position:outside}
details[open] summary{border-bottom:1px solid var(--line);margin-bottom:6px}
.related{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;padding:0;list-style:none}
.related a{display:block;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px;text-decoration:none;color:var(--ink);height:100%}
.related a:hover{border-color:var(--green)}
.related b{display:block;color:var(--green);font-family:var(--serif)}
.related span{font-size:.88rem;color:var(--muted)}
/* home */
.hero{padding:28px 0 8px}
.hero h1{font-size:clamp(1.8rem,5vw,2.8rem)}
.hero h1 em{font-style:normal;background:linear-gradient(transparent 60%,var(--mark) 60%)}
.cat{margin-top:22px}
.cat h2{display:flex;align-items:center;gap:10px;font-size:1.25rem}
.cat h2::after{content:"";flex:1;border-bottom:2px dotted var(--line)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;text-decoration:none;color:var(--ink);display:flex;gap:12px;align-items:flex-start;box-shadow:var(--shadow);transition:transform .15s}
.card:hover{transform:translateY(-2px);border-color:var(--green);color:var(--ink)}
.card .ic{flex:none;width:42px;height:42px;border-radius:10px;background:var(--green-soft);color:var(--green);display:grid;place-items:center;font:700 .95rem var(--serif)}
.card b{display:block;font-family:var(--serif);font-size:1.05rem}
.card span{font-size:.88rem;color:var(--muted)}
.ad-slot{min-height:0;margin:0}
.ad-slot:empty{display:none}
/* footer */
.foot{margin-top:48px;border-top:1px solid var(--line);padding:24px 0 40px;font-size:.9rem;color:var(--muted)}
.foot .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}
.foot a{color:var(--muted);text-decoration:none;display:block;padding:3px 0}
.foot a:hover{color:var(--green)}
.foot h4{margin:0 0 6px;color:var(--ink);font-family:var(--serif)}
.prose{max-width:760px}
@media (max-width:560px){.tool{padding:14px 12px}.stat .v{font-size:1.6rem}}
@media print{
 .top,.foot,.crumbs,.related,.actions,.ad-slot,.no-print,.content,.lead,.theme-btn,.icon-btn{display:none!important}
 body{background:#fff;color:#000;font-size:12px}
 .tool{border:0;box-shadow:none;padding:0}.tool::before{display:none}
 input,select{border:0;padding:0;min-height:0;background:transparent}
 .result{background:#fff;border:1px solid #999}
 .print-only{display:block!important}
}
.print-only{display:none}