:root{--bg:#f8fafc;--fg:#0f172a;--muted:#475569;--card:#ffffff;--line:#e2e8f0;--accent:#2563eb;--accent-fg:#fff;--ok:#16a34a;--warn:#d97706;--bad:#dc2626;--radius:12px;--max:880px}
@media (prefers-color-scheme:dark){:root{--bg:#0b1220;--fg:#e5e7eb;--muted:#9ca3af;--card:#111827;--line:#1f2937;--accent:#60a5fa;--accent-fg:#0b1220}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:var(--card);padding:8px;z-index:9}
.site-header{border-bottom:1px solid var(--line);background:var(--card)}
.site-header .wrap{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding-block:12px}
.brand{font-weight:800;text-decoration:none;color:var(--fg);font-size:1.15rem;letter-spacing:-.01em}
.site-nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.site-nav a{color:var(--muted);text-decoration:none;padding:6px 10px;border-radius:8px;font-size:.92rem}
.site-nav a:hover,.site-nav a[aria-current]{background:var(--bg);color:var(--fg)}
main{padding-block:24px 48px}
h1{font-size:clamp(1.6rem,4vw,2.3rem);line-height:1.15;margin:8px 0 6px;letter-spacing:-.02em}
h2{font-size:1.35rem;margin:36px 0 10px}h3{font-size:1.1rem;margin:22px 0 6px}
.lede{color:var(--muted);font-size:1.05rem;margin:0 0 20px}
a{color:var(--accent)}
.tool{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:16px 0 28px}
.tool h2:first-child{margin-top:0}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:end}
.field{display:flex;flex-direction:column;gap:4px;min-width:0;flex:1 1 140px}
label{font-size:.88rem;color:var(--muted);font-weight:600}
input,select,textarea,button{font:inherit;color:inherit}
input,select,textarea{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:10px 12px;width:100%;min-width:0}
textarea{min-height:160px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
button,.btn{background:var(--accent);color:var(--accent-fg);border:0;border-radius:8px;padding:10px 16px;font-weight:700;cursor:pointer;text-decoration:none;display:inline-block}
button.secondary,.btn.secondary{background:transparent;color:var(--fg);border:1px solid var(--line)}
button:disabled{opacity:.5;cursor:not-allowed}
.result{font-size:1.6rem;font-weight:800;margin:12px 0 4px}
.result small{font-size:.9rem;font-weight:500;color:var(--muted)}
.ok{color:var(--ok)}.warn{color:var(--warn)}.bad{color:var(--bad)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.card h3{margin:0 0 4px}.card p{margin:0;color:var(--muted);font-size:.95rem}
.card a{text-decoration:none;color:inherit}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
th{color:var(--muted);font-weight:600}
.table-wrap{overflow-x:auto}
.faq details{border-bottom:1px solid var(--line);padding:10px 0}
.faq summary{cursor:pointer;font-weight:600}
.faq p{margin:8px 0 0;color:var(--muted)}
.related ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px}
.related li a{display:inline-block;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 12px;text-decoration:none;color:var(--fg);font-size:.92rem}
.updated{color:var(--muted);font-size:.85rem;margin-top:32px}
.ad{min-height:90px;margin:16px 0;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.8rem}
.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem;padding-block:20px}
.note{background:var(--card);border-left:4px solid var(--accent);padding:10px 14px;border-radius:0 8px 8px 0;margin:14px 0}
.share{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--bg);border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:2px 6px;font-size:.85em}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media (max-width:600px){.site-nav a{padding:6px 8px;font-size:.85rem}.tool{padding:14px}}
/* print: keep only the tool and results */
@media print{.site-header,.site-nav,.ad,.related,.site-footer,.faq,.share,.no-print,.skip,.updated{display:none!important}body{background:#fff;color:#000}.tool{border:0;padding:0;box-shadow:none}main{padding:0}input,select{border:1px solid #999;background:#fff;color:#000}button{display:none!important}}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:14px 0}
.stat{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.stat .k{font-size:.8rem;color:var(--muted);font-weight:600}.stat .v{font-size:1.25rem;font-weight:800}
.stat.big .v{font-size:1.6rem}
.hint{color:var(--muted);font-size:.85rem;margin:4px 0 0}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:12px 0}
.check{display:flex;align-items:center;gap:8px;font-size:.92rem;color:var(--fg);font-weight:500}
.check input{width:auto}