:root{--bg:#fff;--card:#eef5f1;--text:#1c1c1a;--muted:#4a5f55;--line:#d5e3dc;--accent:#0f6e56;--warn-bg:#fdf3e3;--warn:#7a4a06}
@media (prefers-color-scheme:dark){:root{--bg:#141816;--card:#1e2823;--text:#ececea;--muted:#a3b5ab;--line:#2f3b35;--accent:#5dcaa5;--warn-bg:#2b2416;--warn:#f0c987}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}
.wrap{max-width:720px;margin:0 auto;padding:0 16px}
header{border-bottom:1px solid var(--line);position:relative}
header .wrap{position:relative}
.bar{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{font-weight:500;text-decoration:none;color:var(--text)}
nav button{font:inherit;color:var(--text);background:none;border:0;padding:6px 10px;cursor:pointer;border-radius:6px;min-height:40px}
nav button:hover{background:var(--card)}
#tools{display:none;position:absolute;right:16px;top:100%;z-index:20;min-width:230px;max-width:calc(100vw - 32px);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:8px;box-shadow:0 6px 20px rgba(0,0,0,.12);font-size:15px}
#tools.open{display:block}
#tools ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
#tools li a{display:block;padding:10px 12px;border-radius:6px;text-decoration:none}
#tools li a:hover,#tools li a[aria-current]{background:var(--card)}
h1{font-size:26px;line-height:1.25;font-weight:500;margin:28px 0 6px}
h2{font-size:18px;font-weight:500;margin:32px 0 8px}
.lead{color:var(--muted);margin:0 0 20px}
label.field{display:block;font-size:14px;color:var(--muted);margin-bottom:4px}
input[type=date],input[type=number],select{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:8px 10px;min-height:44px;max-width:100%}
.row{margin:0 0 14px}
.two{display:flex;gap:12px;flex-wrap:wrap}
.two .row{flex:1 1 200px}
fieldset{border:0;margin:20px 0 0;padding:0}
legend{font-size:14px;color:var(--muted);padding:0;margin-bottom:6px}
.group{margin:14px 0 0}
.group h3{font-size:14px;font-weight:500;margin:0 0 4px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:2px 16px}
.more,.adv{margin:18px 0 0;border-top:1px solid var(--line);padding-top:12px}
.more summary,.adv summary{cursor:pointer;font-size:15px;color:var(--accent);min-height:32px}
.opt{display:flex;gap:10px;align-items:flex-start;padding:6px 0;cursor:pointer;font-size:15px}
.opt input{margin-top:5px;width:18px;height:18px;flex:none}
.opt span small{color:var(--muted);font-size:14px}
.result{margin:28px 0 0;padding:18px 20px;background:var(--card);border-radius:10px}
.result .k{font-size:14px;color:var(--muted);margin:0}
.result .big{font-size:24px;font-weight:500;margin:2px 0 14px}
.result .mid{font-size:17px;font-weight:500;margin:2px 0 14px}
.result .why{font-size:14px;color:var(--muted);margin:0 0 8px}
.warn{margin:14px 0 0;padding:10px 12px;background:var(--warn-bg);color:var(--warn);border-radius:8px;font-size:14px}
.err{color:#b3261e;font-size:14px;margin:0}
@media (prefers-color-scheme:dark){.err{color:#f2958e}}
.actions{margin-top:14px}
.actions button{font:inherit;font-size:14px;color:var(--text);background:none;border:1px solid var(--line);border-radius:8px;padding:8px 14px;cursor:pointer;min-height:40px}
.actions button:hover{background:var(--card)}
.notes{font-size:15px}
.notes p,.notes li{margin:0 0 10px}
.notes h3{font-size:16px;font-weight:500;margin:22px 0 6px}
.notes dt{font-weight:500;margin-top:14px}
.notes dd{margin:2px 0 0}
.tool-list{list-style:none;padding:0;margin:20px 0}
.tool-list li{padding:14px 0;border-top:1px solid var(--line)}
.tool-list li:last-child{border-bottom:1px solid var(--line)}
.tool-list a{font-weight:500}
.tool-list span{display:block;color:var(--muted);font-size:15px}
.free{background:var(--card);border-radius:10px;padding:12px 16px;font-size:15px;margin:20px 0}
@media (prefers-color-scheme:dark){:root{--red:#ff8a80}}
:root{--red:#b3261e}
.free-banner{background:var(--card);border-bottom:1px solid var(--line)}
.free-banner p{margin:0;padding:8px 0;font-weight:600;font-size:15px;color:var(--red);text-align:center}
.meta{font-size:13px;color:var(--muted);margin:-12px 0 18px}
.toc{border:1px solid var(--line);border-radius:10px;padding:10px 16px;margin:0 0 8px;font-size:14px}
.toc p{margin:0 0 4px;font-weight:500}.toc ul{margin:0;padding-left:18px}.toc li{margin:0 0 2px}
footer{margin:40px 0 28px;padding-top:16px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
footer ul{list-style:none;padding:0;margin:0 0 10px;display:flex;flex-wrap:wrap;gap:4px 16px}
@media print{header,.free-banner,.toc,.actions,fieldset,.field,.row,.notes,.adv,footer,.free{display:none}.result{background:none;padding:0}}