:root{--p:#0f766e;--pd:#115e59;--a:#f59e0b;--bg:#f6f8f7;--card:#fff;--tx:#1f2933;--mu:#5b6770;--bd:#e3e8e6;--r:14px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Sans Devanagari",sans-serif;color:var(--tx);background:var(--bg)}
a{color:var(--p)}img{max-width:100%;height:auto}
.wrap{max-width:980px;margin:0 auto;padding:0 16px}
header.site{background:var(--p);color:#fff;position:sticky;top:0;z-index:10;box-shadow:0 2px 8px rgba(0,0,0,.12)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:56px}
.logo{display:flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-weight:800;font-size:1.2rem;letter-spacing:.2px}
.logo b{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:9px;background:var(--a);color:#3b2a00;font-size:1.05rem}
nav.top a{color:#e6fffb;text-decoration:none;margin-left:14px;font-size:.95rem}nav.top a:hover{color:#fff;text-decoration:underline}
.crumbs{font-size:.85rem;color:var(--mu);margin:14px 0 4px}.crumbs a{color:var(--mu)}
h1{font-size:1.65rem;line-height:1.25;margin:.3em 0 .35em}h2{font-size:1.3rem;margin:1.6em 0 .5em}h3{font-size:1.08rem;margin:1.2em 0 .3em}
.lead{color:var(--mu);margin:0 0 14px}
.card{background:var(--card);border:1px solid var(--bd);border-radius:var(--r);padding:18px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.tool{margin:10px 0 18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
label{display:block;font-weight:600;font-size:.92rem;margin-bottom:4px}
.f{margin-bottom:12px}
input[type=number],input[type=date],input[type=text],select,textarea{width:100%;padding:11px 12px;border:1px solid #cbd5d1;border-radius:10px;font:inherit;background:#fff;color:var(--tx)}
input:focus,select:focus,textarea:focus{outline:2px solid #5eead4;border-color:var(--p)}
textarea{min-height:200px;resize:vertical}
.chk{display:flex;align-items:center;gap:8px;font-weight:500}.chk input{width:18px;height:18px}
.radios{display:flex;gap:16px;flex-wrap:wrap}.radios label{font-weight:500;display:flex;gap:6px;align-items:center}
.btn{display:inline-block;background:var(--p);color:#fff;border:0;border-radius:10px;padding:12px 20px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--pd)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.alt{background:var(--a);color:#3b2a00}
.result{margin-top:16px;padding:16px;border-radius:12px;background:#ecfdf5;border:1px solid #a7f3d0}
.result .big{font-size:1.6rem;font-weight:800;color:var(--pd);line-height:1.3;margin-bottom:8px}.result .big small{font-size:.9rem;font-weight:600;color:var(--mu)}
.rows{margin:0}.rows div{display:flex;justify-content:space-between;gap:10px;padding:6px 0;border-bottom:1px dashed #c6e9dc}.rows div:last-child{border:0}
.rows dt{color:var(--mu)}.rows dd{margin:0;font-weight:700;text-align:right}
.err{color:#b91c1c;font-weight:600;margin:6px 0}.ok{color:#047857;font-weight:700;margin:6px 0}
.bar{display:flex;height:14px;border-radius:7px;overflow:hidden;margin:12px 0 6px}.bar span{display:block}
.c1{background:var(--p)}.c2{background:var(--a)}.legend{display:flex;gap:16px;font-size:.85rem}.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px}
details{margin-top:10px}summary{cursor:pointer;font-weight:600;color:var(--p)}
.tw{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:.9rem;margin-top:8px;background:#fff}th,td{border:1px solid var(--bd);padding:6px 8px;text-align:right}th{background:#f0faf8}td:first-child,th:first-child{text-align:center}
.pc-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:12px 0;border-bottom:1px solid var(--bd)}.pc-row input{width:110px}.pc-row output{font-weight:800;color:var(--pd);font-size:1.1rem}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}.stats div{background:#ecfdf5;border-radius:10px;padding:10px;text-align:center}.stats b{display:block;font-size:1.4rem;color:var(--pd)}.stats span{font-size:.8rem;color:var(--mu)}
#imglist{list-style:none;padding:0;margin:12px 0;display:grid;gap:8px}#imglist li{display:flex;align-items:center;gap:10px;background:#f8fafa;border:1px solid var(--bd);border-radius:10px;padding:6px}
#imglist img{width:54px;height:54px;object-fit:cover;border-radius:6px}#imglist span{flex:1;font-size:.85rem;word-break:break-all}#imglist button{border:1px solid var(--bd);background:#fff;border-radius:8px;width:34px;height:34px;cursor:pointer}
.drop{display:block;border:2px dashed #94d3c9;border-radius:12px;padding:22px;text-align:center;background:#f3fbf9;cursor:pointer}.drop input{display:none}
article.content{background:var(--card);border:1px solid var(--bd);border-radius:var(--r);padding:6px 20px 18px;margin:18px 0}
article.content p,article.content li{color:#2b3640}
.formula{background:#fffbeb;border-left:4px solid var(--a);padding:10px 14px;border-radius:8px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.92rem;overflow-x:auto}
.faq details{border:1px solid var(--bd);border-radius:10px;padding:10px 14px;margin:8px 0;background:#fff}.faq summary{color:var(--tx)}
.tools{display:grid;grid-template-columns:repeat(auto-fill,minmax(165px,1fr));gap:12px;margin:14px 0}
.tools a{display:block;background:#fff;border:1px solid var(--bd);border-radius:12px;padding:14px;text-decoration:none;color:var(--tx);transition:.15s}
.tools a:hover{border-color:var(--p);box-shadow:0 4px 14px rgba(15,118,110,.12);transform:translateY(-1px)}
.tools .ic{font-size:1.5rem}.tools b{display:block;margin:4px 0 2px}.tools small{color:var(--mu);line-height:1.4;display:block}
.hero{background:linear-gradient(135deg,#0f766e,#134e4a);color:#fff;border-radius:0 0 22px 22px;padding:26px 0 30px}
.hero h1{font-size:1.9rem}.hero p{color:#d1fae5;margin:0 0 14px}.hero .btn{margin-right:8px}
.related{margin:18px 0}.related ul{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0}.related a{display:inline-block;background:#fff;border:1px solid var(--bd);border-radius:20px;padding:6px 12px;text-decoration:none;font-size:.9rem}
.ad-slot{margin:16px auto;text-align:center;min-height:0;overflow:hidden}.ad-slot.ad-filled{min-height:60px}
.ad-slot.ad-filled::before{content:"Advertisement";display:block;font-size:.7rem;color:#9aa5ad;letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}
footer.site{background:#10221f;color:#b8c7c3;margin-top:30px;padding:24px 0 30px;font-size:.9rem}
footer.site a{color:#d6efe9;text-decoration:none}footer.site a:hover{text-decoration:underline}
.fcols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:18px}.fcols ul{list-style:none;padding:0;margin:6px 0}.fcols li{margin:3px 0}
.counter{margin-top:16px;padding-top:12px;border-top:1px solid #29403b;display:flex;align-items:center;gap:8px;color:#e6fffb;font-weight:600}
.counter .dot{width:9px;height:9px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 3px rgba(34,197,94,.25)}
.hk-note{font-weight:400;color:#fcd34d}
.legal h2{font-size:1.15rem}
@media (max-width:640px){h1{font-size:1.4rem}.hero h1{font-size:1.55rem}.grid2{grid-template-columns:1fr}.fcols{grid-template-columns:1fr 1fr}.fcols>div:first-child{grid-column:1/-1}nav.top a.hide-m{display:none}.stats{grid-template-columns:repeat(2,1fr)}}