:root{--ink:#14213D;--paper:#F3F6F4;--card:#fff;--accent:#2B59FF;--sun:#FFD23F;--muted:#5B6578;--line:#D5DCE4;--ok:#13795B;--warn:#B45309;--bad:#B42318}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Sans Bengali",sans-serif;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:32px 32px;background-attachment:fixed}
body::before{content:"";position:fixed;inset:0;background:rgba(243,246,244,.86);z-index:-1}
a{color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
header.site{border-bottom:2px solid var(--ink);background:var(--card)}
header.site .wrap{display:flex;align-items:center;gap:20px;flex-wrap:wrap;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;color:var(--ink);text-decoration:none}
.brand img{width:34px;height:34px;border-radius:8px;display:block}
nav ul{list-style:none;margin:0;padding:0;display:flex;gap:4px;flex-wrap:wrap}
nav a{display:block;padding:6px 12px;border-radius:999px;color:var(--ink);text-decoration:none;font-weight:600;font-size:.95rem}
nav a:hover{background:var(--paper)}
nav a[aria-current="page"]{background:var(--ink);color:#fff}
h1{font-size:clamp(1.9rem,5vw,2.8rem);line-height:1.15;margin:36px 0 10px;letter-spacing:-.02em}
.lead{color:var(--muted);max-width:62ch;margin:0 0 24px}
.tool{background:var(--card);border:2px solid var(--ink);border-radius:14px;padding:24px;box-shadow:6px 6px 0 var(--ink)}
label{display:block;font-weight:700;font-size:.92rem;margin:0 0 6px}
input[type=text],input[type=number],input[type=date],select,textarea{width:100%;padding:11px 12px;font:inherit;border:2px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
textarea{min-height:90px;resize:vertical}
input:focus,select:focus,textarea:focus{border-color:var(--accent)}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:16px;margin-bottom:16px}
.btn{display:inline-block;background:var(--accent);color:#fff;border:2px solid var(--ink);border-radius:8px;padding:11px 20px;font:inherit;font-weight:700;cursor:pointer}
.btn:hover{filter:brightness(1.08)}
.btn.alt{background:var(--sun);color:var(--ink)}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.result{margin-top:20px;padding:16px;border-radius:10px;background:var(--paper);border:2px dashed var(--ink);min-height:60px}
.big{font-size:2.4rem;font-weight:800;line-height:1.1}
.tag{display:inline-block;padding:2px 10px;border-radius:999px;font-weight:700;font-size:.9rem;background:var(--sun)}
.err{color:var(--bad);font-weight:600}
.qr-out{display:flex;gap:24px;flex-wrap:wrap;align-items:flex-start;margin-top:20px}
.qr-out canvas{max-width:100%;height:auto;border:2px solid var(--ink);border-radius:8px;background:#fff}
.seg{display:flex;gap:0;margin-bottom:16px;flex-wrap:wrap}
.seg button{flex:1;min-width:130px;padding:9px 12px;font:inherit;font-weight:700;border:2px solid var(--ink);background:#fff;color:var(--ink);cursor:pointer;margin:0 -2px -2px 0}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff}
.check{display:flex;align-items:center;gap:8px;font-weight:600;margin:6px 0}
.check input{width:20px;height:20px}
article{margin:44px 0}
article h2{font-size:1.5rem;margin:32px 0 10px}
article h3{font-size:1.1rem;margin:22px 0 6px}
article p,article li{max-width:70ch}
details{background:var(--card);border:2px solid var(--line);border-radius:8px;padding:10px 14px;margin:10px 0;max-width:70ch}
summary{font-weight:700;cursor:pointer}
.more{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;padding:0;list-style:none}
.more a{display:block;padding:12px 14px;border:2px solid var(--ink);border-radius:8px;background:var(--card);text-decoration:none;font-weight:700;color:var(--ink)}
.more a:hover{background:var(--sun)}
footer.site{border-top:2px solid var(--ink);background:var(--card);padding:22px 0;color:var(--muted);font-size:.92rem}
table{border-collapse:collapse;max-width:70ch;width:100%}
th,td{border:1px solid var(--line);padding:8px 12px;text-align:left}
th{background:var(--paper)}
@media (max-width:560px){.tool{padding:16px;box-shadow:4px 4px 0 var(--ink)}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}