:root{
  --green:#0b7a43; --green-d:#065c31; --teal:#0e7c86; --ink:#16302a; --mut:#5a6e68;
  --bg:#f2f7f4; --card:#ffffff; --line:#dcebe2; --amber:#ffb300; --soft:#e6f4ec;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Hind Siliguri','Segoe UI',system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1060px;margin:0 auto;padding:0 16px}
/* header */
header{background:linear-gradient(120deg,var(--green-d),var(--green) 55%,var(--teal));color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 3px 14px rgba(0,0,0,.18)}
.hbar{display:flex;align-items:center;gap:14px;padding:11px 0;flex-wrap:wrap}
.logo{font-size:23px;font-weight:800;color:#fff;display:flex;align-items:center;gap:8px}
.logo:hover{text-decoration:none}
.logo .mark{background:none;padding:0;border-radius:50%;display:inline-flex;line-height:0}
.logo small{display:block;font-size:11px;font-weight:600;opacity:.85;letter-spacing:.4px}
nav{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
nav a{color:#eafff3;font-size:14.5px;font-weight:600;padding:6px 10px;border-radius:8px}
nav a:hover{background:rgba(255,255,255,.16);text-decoration:none}
/* hero */
.hero{background:linear-gradient(150deg,#e8f6ee,#f7fbf8);border-bottom:1px solid var(--line);padding:34px 0 26px;text-align:center}
.hero h1{font-size:clamp(25px,5.4vw,40px);line-height:1.3;color:var(--green-d)}
.hero p{color:var(--mut);max-width:640px;margin:8px auto 0;font-size:16.5px}
.badges{margin-top:14px;display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.badge{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:4px 14px;font-size:13.5px;font-weight:700;color:var(--green-d)}
/* tool grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;padding:26px 0}
.tcard{background:var(--card);border:1.5px solid var(--line);border-radius:16px;padding:20px;transition:.18s;display:block;color:var(--ink)}
.tcard:hover{transform:translateY(-3px);box-shadow:0 12px 26px rgba(6,92,49,.13);text-decoration:none;border-color:var(--green)}
.tcard .ic{font-size:34px}
.tcard h2,.tcard h3{font-size:19px;margin:6px 0 4px;color:var(--green-d)}
.tcard p{font-size:14.5px;color:var(--mut)}
.tcard .go{margin-top:10px;font-weight:800;color:var(--green);font-size:14.5px}
/* content sections */
.sec{background:var(--card);border:1.5px solid var(--line);border-radius:16px;padding:22px 24px;margin:18px 0}
.sec h2{color:var(--green-d);font-size:21px;margin-bottom:8px}
.sec h3{color:var(--green-d);font-size:17px;margin:14px 0 4px}
.sec p,.sec li{color:#33524a;font-size:15.5px}
.sec ol,.sec ul{margin:6px 0 6px 22px}
.faq dt{font-weight:800;color:var(--ink);margin-top:12px;font-size:15.5px}
.faq dd{color:#33524a;font-size:15px;margin-top:2px}
/* tool UI */
.toolbox{background:var(--card);border:1.5px solid var(--line);border-radius:16px;padding:20px;margin:20px 0}
.drop{border:2.5px dashed #9fd3b4;border-radius:14px;background:var(--soft);padding:26px 14px;text-align:center;cursor:pointer;transition:.15s}
.drop:hover,.drop.over{border-color:var(--green);background:#d9efe1}
.drop .big{font-size:19px;font-weight:800;color:var(--green-d)}
.drop .small{font-size:13.5px;color:var(--mut)}
input[type=file]{display:none}
.btn{display:inline-block;background:linear-gradient(180deg,#12a158,var(--green));color:#fff;border:none;font-family:inherit;font-size:16.5px;font-weight:800;padding:11px 26px;border-radius:999px;cursor:pointer;box-shadow:0 4px 0 var(--green-d)}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 var(--green-d)}
.btn.alt{background:linear-gradient(180deg,#42a5f5,#1565c0);box-shadow:0 4px 0 #0d47a1}
.btn.ghost{background:#fff;color:var(--green-d);border:2px solid var(--green);box-shadow:none}
.btn:disabled{opacity:.5;cursor:not-allowed}
.presets{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}
.preset{border:2px solid var(--line);background:#fff;border-radius:12px;padding:8px 14px;font-family:inherit;font-size:14.5px;font-weight:700;cursor:pointer;color:var(--ink)}
.preset.sel{border-color:var(--green);background:var(--soft);color:var(--green-d)}
.frow{display:flex;gap:12px;flex-wrap:wrap;margin:10px 0}
.field{flex:1;min-width:140px}
.field label{display:block;font-size:13.5px;font-weight:700;color:var(--mut);margin-bottom:3px}
.field input,.field select{width:100%;padding:9px 11px;border:1.5px solid var(--line);border-radius:10px;font-family:inherit;font-size:15.5px;background:#fff;color:var(--ink)}
.frame{position:relative;margin:14px auto;border-radius:12px;overflow:hidden;background:#263238 repeating-conic-gradient(#37474f 0% 25%, #263238 0% 50%) 0 0/22px 22px;touch-action:none;user-select:none;box-shadow:0 6px 20px rgba(0,0,0,.2)}
.frame img{position:absolute;max-width:none;cursor:grab}
.frame .guide{position:absolute;inset:0;pointer-events:none;border:2px solid rgba(255,255,255,.0)}
.result{display:none;background:var(--soft);border:1.5px solid #9fd3b4;border-radius:12px;padding:14px 16px;margin-top:14px;text-align:center}
.result .ok{font-weight:800;color:var(--green-d);font-size:17px}
.result img{max-width:180px;border-radius:8px;margin:8px auto;display:block;box-shadow:0 4px 14px rgba(0,0,0,.2)}
table.calc{width:100%;border-collapse:collapse;margin:10px 0}
table.calc th,table.calc td{border:1px solid var(--line);padding:7px 8px;font-size:14.5px;text-align:left}
table.calc th{background:var(--soft);color:var(--green-d)}
table.calc input,table.calc select{width:100%;padding:6px 8px;border:1.5px solid var(--line);border-radius:8px;font-family:inherit;font-size:14.5px}
.verdict{font-size:18px;font-weight:800;padding:13px 16px;border-radius:12px;margin-top:12px;text-align:center;display:none}
.verdict.yes{display:block;background:#e8f5e9;color:#1b5e20;border:1.5px solid #66bb6a}
.verdict.no{display:block;background:#fdecea;color:#b71c1c;border:1.5px solid #ef9a9a}
.note{font-size:13.5px;color:var(--mut);margin-top:10px}
.sigpad{width:100%;height:190px;background:#fff;border:2px solid var(--line);border-radius:12px;touch-action:none;cursor:crosshair}
.thumbs{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}
.thumbs .th{position:relative;width:86px;height:86px;border-radius:10px;overflow:hidden;border:1.5px solid var(--line)}
.thumbs .th img{width:100%;height:100%;object-fit:cover}
.thumbs .th button{position:absolute;top:2px;right:2px;background:rgba(183,28,28,.92);color:#fff;border:none;border-radius:50%;width:21px;height:21px;cursor:pointer;font-size:12px;line-height:1}
/* footer */
footer{background:#0d2b20;color:#cfe8da;margin-top:34px;padding:26px 0 20px;font-size:14.5px}
footer a{color:#9fe8bf}
.fcols{display:flex;gap:26px;flex-wrap:wrap}
.fcols div{min-width:170px}
.fcols h4{color:#fff;margin-bottom:6px;font-size:15px}
footer .fine{border-top:1px solid rgba(255,255,255,.16);margin-top:18px;padding-top:12px;font-size:13px;color:#9dc3ae;text-align:center}
@media(max-width:560px){ nav{margin-left:0} .hbar{gap:8px} }