:root{
  --bg:#f6f7fb;--card:#fff;--ink:#14161f;--muted:#5d6475;--line:#e4e7ef;
  --brand:#4f46e5;--brand-2:#7c3aed;--brand-soft:#eef0ff;--ok:#059669;--err:#dc2626;
  --radius:14px;--shadow:0 1px 2px rgba(20,22,31,.05),0 6px 24px rgba(20,22,31,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Bengali",sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;font-size:16px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:1100px;margin:0 auto;padding:0 18px}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:62px;gap:12px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:20px;color:var(--ink);letter-spacing:-.3px}
.logo:hover{text-decoration:none}
.logo-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff;font-size:17px}
.logo b{color:var(--brand)}
.nav{display:flex;gap:18px;font-weight:600;font-size:15px}
.nav a{color:var(--muted)}
.nav a:hover{color:var(--brand);text-decoration:none}
@media(max-width:640px){.nav .hide-sm{display:none}}

/* hero */
.hero{background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%);color:#fff;padding:54px 0 64px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,44px);line-height:1.15;margin:0 0 12px;letter-spacing:-.8px}
.hero p{font-size:clamp(16px,2.4vw,19px);opacity:.92;margin:0 auto 26px;max-width:640px}
.search{max-width:520px;margin:0 auto;position:relative}
.search input{width:100%;padding:16px 20px 16px 48px;border-radius:999px;border:0;font-size:16px;box-shadow:0 10px 30px rgba(0,0,0,.18);outline:none}
.search svg{position:absolute;left:18px;top:50%;transform:translateY(-50%);opacity:.5}
.badges{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:22px;font-size:14px}
.badges span{background:rgba(255,255,255,.16);padding:6px 12px;border-radius:999px}

/* tool grid */
.section{padding-top:40px;padding-bottom:40px}
.cat-title{font-size:20px;margin:28px 0 14px;display:flex;align-items:center;gap:8px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.tool-card{display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;color:var(--ink);transition:.15s;box-shadow:var(--shadow)}
.tool-card:hover{transform:translateY(-2px);border-color:#c7cbff;text-decoration:none}
.tool-card .ic{flex:0 0 46px;height:46px;border-radius:12px;background:var(--brand-soft);display:grid;place-items:center;font-size:23px}
.tool-card h3{margin:0 0 3px;font-size:16px}
.tool-card p{margin:0;font-size:14px;color:var(--muted);line-height:1.45}
.no-result{display:none;text-align:center;color:var(--muted);padding:30px}

/* tool page */
.crumbs{font-size:14px;color:var(--muted);padding:18px 0 0}
.tool-head{padding:14px 0 8px}
.tool-head h1{margin:0 0 6px;font-size:clamp(26px,4vw,36px);letter-spacing:-.5px;line-height:1.2}
.tool-head p{margin:0;color:var(--muted);font-size:17px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin:18px 0}
.row{display:flex;gap:14px;flex-wrap:wrap}
.row>*{flex:1 1 200px}
label{display:block;font-weight:600;font-size:14px;margin:0 0 6px}
input[type=text],input[type=number],input[type=date],input[type=url],select,textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:16px;font-family:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid #c7cbff;border-color:var(--brand)}
textarea{min-height:200px;resize:vertical}
input[type=range]{width:100%;accent-color:var(--brand)}
.field{margin-bottom:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--brand);color:#fff;border:0;border-radius:10px;padding:13px 22px;font-size:16px;font-weight:700;cursor:pointer;font-family:inherit;transition:.15s}
.btn:hover{background:#4338ca;text-decoration:none}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.ghost{background:var(--brand-soft);color:var(--brand)}
.btn.ghost:hover{background:#e0e3ff}
.btn.sm{padding:8px 14px;font-size:14px}
.btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}

.drop{border:2px dashed #c7cbff;background:#fafaff;border-radius:var(--radius);padding:38px 18px;text-align:center;cursor:pointer;transition:.15s}
.drop:hover,.drop.over{background:var(--brand-soft);border-color:var(--brand)}
.drop .big{font-size:40px}
.drop strong{display:block;font-size:18px;margin:6px 0 4px}
.drop span{color:var(--muted);font-size:14px}
.drop input{display:none}

.result{margin-top:18px}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}
.stat{background:var(--brand-soft);border-radius:12px;padding:14px;text-align:center}
.stat b{display:block;font-size:clamp(17px,2.2vw,22px);color:var(--brand);line-height:1.25;overflow-wrap:break-word}
.stat span{font-size:13px;color:var(--muted)}
.big-result{font-size:clamp(26px,5vw,38px);font-weight:800;color:var(--brand);text-align:center;margin:8px 0}
.note{font-size:14px;color:var(--muted)}
.msg{padding:12px 14px;border-radius:10px;font-size:15px;margin-top:12px}
.msg.ok{background:#ecfdf5;color:var(--ok)}
.msg.err{background:#fef2f2;color:var(--err)}

.file-list{list-style:none;padding:0;margin:14px 0 0}
.file-list li{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:#fff;font-size:14px}
.file-list img{width:52px;height:52px;object-fit:cover;border-radius:8px;flex:0 0 52px}
.file-list .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-list .meta{color:var(--muted);white-space:nowrap}
.file-list .save{color:var(--ok);font-weight:700}
.icon-btn{border:0;background:#f1f2f6;border-radius:8px;width:32px;height:32px;cursor:pointer;font-size:15px}
.icon-btn:hover{background:#e4e6ee}

.preview{max-width:100%;border-radius:10px;border:1px solid var(--line);display:block;margin:12px auto}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.thumbs figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.thumbs figure img{display:block;width:100%}
.thumbs figcaption{padding:10px;display:flex;justify-content:space-between;align-items:center;font-size:14px;font-weight:600}

.pw-out{font-family:ui-monospace,Consolas,monospace;font-size:22px;word-break:break-all;background:#f3f4f8;padding:16px;border-radius:10px;text-align:center}
.check{display:flex;align-items:center;gap:8px;font-weight:500;margin:6px 0}
.check input{width:18px;height:18px;accent-color:var(--brand)}
.meter{height:8px;border-radius:99px;background:#e9eaf0;overflow:hidden;margin-top:10px}
.meter i{display:block;height:100%;width:0;transition:.3s}

table.sched{width:100%;border-collapse:collapse;font-size:14px}
table.sched th,table.sched td{padding:8px;border-bottom:1px solid var(--line);text-align:right}
table.sched th:first-child,table.sched td:first-child{text-align:left}
.scroll-x{overflow-x:auto;max-height:360px;overflow-y:auto}

/* ads */
.ad-slot{margin:22px auto;text-align:center;min-height:0}
.ad-slot:empty{display:none}

/* content */
.content{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;margin:24px 0}
.content h2{font-size:22px;margin:22px 0 8px;letter-spacing:-.3px}
.content h2:first-child{margin-top:0}
.content h3{font-size:17px;margin:16px 0 4px}
.content p,.content li{color:#30343f}
.content ol,.content ul{padding-left:22px}
.faq details{border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:8px 0;background:#fcfcfe}
.faq summary{font-weight:700;cursor:pointer}
.faq details p{margin:8px 0 0}
.related{margin:30px 0}
.related h2{font-size:20px}

/* footer */
.site-footer{background:#11131c;color:#b7bccb;padding:38px 0 26px;margin-top:40px;font-size:14px}
.site-footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
@media(max-width:760px){.site-footer .cols{grid-template-columns:1fr 1fr}}
.site-footer h4{color:#fff;margin:0 0 10px;font-size:15px}
.site-footer a{color:#b7bccb;display:block;margin:5px 0}
.site-footer a:hover{color:#fff}
.site-footer .copy{border-top:1px solid #262a38;margin-top:24px;padding-top:18px;text-align:center}
.page{max-width:800px}

@media(max-width:640px){.hero{padding:34px 0 40px}.badges{gap:6px;font-size:13px}.panel,.content{padding:16px}.tool-head p{font-size:16px}}