:root{
  --bg:#f4f6f8;--surface:#ffffff;--surface-2:#f8fafb;--border:#e3e8ec;--text:#16202a;--muted:#5f6b78;--faint:#8e99a5;
  --accent:#0f766e;--accent-2:#115e59;--accent-soft:#e6f4f1;--danger:#b42318;--danger-soft:#fdecea;--warn:#b54708;--warn-soft:#fff4e5;--ok:#067647;--ok-soft:#e7f6ec;--info:#175cd3;--info-soft:#e8f0fd;
  --radius:10px;--shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.08);
  --font:"Inter","Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,"Noto Sans Bengali",sans-serif;--mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}html{font-size:15px}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.45;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0 0 .5rem;font-weight:650;letter-spacing:-.01em}h1{font-size:1.5rem}h2{font-size:1.15rem}h3{font-size:1rem}
p{margin:.25rem 0 .75rem}
code,.mono{font-family:var(--mono);font-size:.85em}
.layout{display:flex;min-height:100vh}
.sidebar{width:236px;background:#0b1f24;color:#cfe3e0;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;flex-shrink:0}
.brand{padding:18px 20px 12px;font-weight:700;font-size:1.1rem;color:#fff;display:flex;align-items:center;gap:10px}
.brand .logo{width:28px;height:28px;border-radius:7px;background:linear-gradient(135deg,#14b8a6,#0f766e);display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:.8rem;font-weight:800}
.company-pill{margin:0 14px 10px;padding:8px 10px;border-radius:8px;background:rgba(255,255,255,.06);font-size:.8rem;color:#a7c4c0}
.company-pill b{display:block;color:#fff;font-size:.86rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav{flex:1;overflow:auto;padding:4px 10px 10px}
.nav .sec{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:#6f8f8b;padding:12px 10px 4px}
.nav a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:7px;color:#cfe3e0;font-size:.9rem}
.nav a:hover{background:rgba(255,255,255,.07);text-decoration:none}.nav a.active{background:rgba(20,184,166,.18);color:#fff}
.nav a svg{width:16px;height:16px;opacity:.8}
.sidebar .foot{padding:12px 14px;border-top:1px solid rgba(255,255,255,.08);font-size:.8rem;color:#8fb0ab}
.sidebar .foot form{margin:0}.sidebar .foot button{background:none;border:0;color:#9fd3cc;cursor:pointer;padding:0;font:inherit}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:54px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:5}
.topbar .crumbs{font-size:.9rem;color:var(--muted)}.topbar .crumbs b{color:var(--text)}
.topbar .right{display:flex;align-items:center;gap:12px;font-size:.85rem;color:var(--muted)}
.content{padding:22px 24px 48px;max-width:1280px;width:100%}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:18px;flex-wrap:wrap}
.page-head .sub{color:var(--muted);font-size:.9rem}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px;margin-bottom:18px}
.card.tight{padding:0}.card h2,.card h3{margin-bottom:12px}
.card .card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;gap:12px}
.grid{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(max-width:1000px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:1fr 1fr}}
.menu-btn{display:none;border:1px solid var(--border);background:var(--surface);border-radius:8px;padding:6px 10px;font-size:1.1rem;line-height:1;cursor:pointer;margin-right:10px}
.nav-backdrop{display:none}
@media(max-width:760px){.sidebar{display:none}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.content{padding:16px}.topbar{padding:0 14px}.menu-btn{display:inline-block}
.layout.nav-open .sidebar{display:flex;position:fixed;left:0;top:0;bottom:0;z-index:60;width:min(84vw,280px);overflow:auto;box-shadow:0 0 0 100vmax rgba(0,0,0,.35)}
.layout.nav-open .nav-backdrop{display:block;position:fixed;inset:0;z-index:55}
.page-head{flex-direction:column;align-items:flex-start}.page-head .btn-row{width:100%}}
.stat{padding:16px 18px}.stat .label{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}.stat .value{font-size:1.5rem;font-weight:700;margin-top:4px;font-variant-numeric:tabular-nums}.stat .hint{font-size:.8rem;color:var(--faint);margin-top:4px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);font:inherit;font-size:.88rem;font-weight:550;cursor:pointer;white-space:nowrap;line-height:1.2}
.btn:hover{background:var(--surface-2);text-decoration:none}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-2)}
.btn.danger{color:var(--danger);border-color:#f3c3be}.btn.danger:hover{background:var(--danger-soft)}.btn.sm{padding:5px 10px;font-size:.8rem}.btn.ghost{border-color:transparent;background:transparent}.btn.ghost:hover{background:var(--surface-2)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
form.inline{display:inline}
label{display:block;font-size:.8rem;font-weight:600;color:var(--muted);margin-bottom:4px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=date],input[type=time],input[type=color],select,textarea{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:8px;font:inherit;font-size:.9rem;background:#fff;color:var(--text)}
input:focus,select:focus,textarea:focus{outline:2px solid rgba(15,118,110,.25);border-color:var(--accent)}
textarea{min-height:72px;resize:vertical}
.field{margin-bottom:12px}.field .help{font-size:.76rem;color:var(--faint);margin-top:3px}
.check{display:flex;align-items:center;gap:8px;font-size:.88rem;font-weight:500;color:var(--text)}.check input{width:auto}
table{width:100%;border-collapse:collapse;font-size:.88rem}
th{text-align:left;font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:600;padding:10px 12px;border-bottom:1px solid var(--border);background:var(--surface-2)}
td{padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:top}
tr:last-child td{border-bottom:0}tbody tr:hover td{background:#fafcfc}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
tr.total td{font-weight:700;background:var(--surface-2)}
.table-wrap{overflow:auto}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:.74rem;font-weight:600;letter-spacing:.02em}
.badge.draft{background:#eef2f5;color:#4b5a68}.badge.issued{background:var(--ok-soft);color:var(--ok)}.badge.cancelled{background:var(--danger-soft);color:var(--danger)}.badge.finalized{background:var(--info-soft);color:var(--info)}.badge.filed{background:var(--ok-soft);color:var(--ok)}
.badge.muted{background:#eef2f5;color:#4b5a68}.badge.warn{background:var(--warn-soft);color:var(--warn)}.badge.ok{background:var(--ok-soft);color:var(--ok)}.badge.info{background:var(--info-soft);color:var(--info)}.badge.danger{background:var(--danger-soft);color:var(--danger)}
.alert{padding:10px 14px;border-radius:8px;font-size:.9rem;margin-bottom:14px;border:1px solid transparent}
.alert.success{background:var(--ok-soft);color:var(--ok);border-color:#bfe6cc}.alert.error{background:var(--danger-soft);color:var(--danger);border-color:#f3c3be}.alert.warn{background:var(--warn-soft);color:var(--warn);border-color:#f6d9b0}.alert.info{background:var(--info-soft);color:var(--info);border-color:#c4d8f7}
.muted{color:var(--muted)}.faint{color:var(--faint)}.small{font-size:.82rem}.right{text-align:right}.nowrap{white-space:nowrap}.mt{margin-top:14px}.mb0{margin-bottom:0}
.kv{display:grid;grid-template-columns:150px 1fr;gap:6px 12px;font-size:.88rem}.kv dt{color:var(--muted)}.kv dd{margin:0}
.filters{display:flex;gap:8px;flex-wrap:wrap;align-items:flex-end;margin-bottom:14px}.filters .field{margin:0;min-width:140px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:18px}.tabs a{padding:10px 14px;border-bottom:2px solid transparent;color:var(--muted);font-weight:550;font-size:.9rem}.tabs a.active{color:var(--accent);border-color:var(--accent)}.tabs a:hover{text-decoration:none;color:var(--text)}
.empty{padding:36px;text-align:center;color:var(--faint)}
.lines-table input,.lines-table select{padding:6px 8px;font-size:.85rem}.lines-table td{padding:6px 6px}.lines-table th{padding:8px 6px}
.lines-table .w-desc{min-width:220px}.lines-table .w-num{width:100px}.lines-table .w-sm{width:70px}.lines-table .w-rate{width:170px}
.totals{margin-left:auto;width:360px;font-size:.92rem}.totals div{display:flex;justify-content:space-between;padding:5px 0;border-bottom:1px dashed var(--border)}.totals div.grand{font-weight:700;font-size:1.05rem;border-bottom:0;padding-top:8px}
.qr-box{display:flex;gap:18px;align-items:flex-start}.qr-box img{width:150px;height:150px;border:1px solid var(--border);border-radius:8px;padding:6px;background:#fff}
.verdict{padding:18px 20px;border-radius:12px;font-size:1.05rem;font-weight:650;display:flex;gap:12px;align-items:center}
.verdict.authentic{background:var(--ok-soft);color:var(--ok)}.verdict.tampered,.verdict.invalid{background:var(--danger-soft);color:var(--danger)}.verdict.cancelled,.verdict.unknown{background:var(--warn-soft);color:var(--warn)}.verdict.not_found{background:#eef2f5;color:#4b5a68}
.bars{display:flex;gap:6px;align-items:flex-end;height:120px}.bars .bar{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;font-size:.7rem;color:var(--muted)}.bars .bar i{display:block;width:100%;background:var(--accent);border-radius:4px 4px 0 0;opacity:.85}.bars .bar i.in{background:#94a3b8}
.auth{min-height:100vh;display:grid;place-items:center;padding:24px}.auth .box{width:100%;max-width:440px}.auth .box.wide{max-width:640px}
.landing{max-width:980px;margin:0 auto;padding:60px 24px}.landing .hero h1{font-size:2.4rem;line-height:1.15;margin-bottom:12px}.landing .hero p{font-size:1.1rem;color:var(--muted);max-width:620px}
.feature{padding:16px}.feature h3{margin-bottom:4px}.feature p{color:var(--muted);font-size:.9rem;margin:0}
.copy{cursor:pointer}
.progress{height:6px;background:#e9eef2;border-radius:4px;overflow:hidden}.progress i{display:block;height:100%;background:var(--accent)}
details summary{cursor:pointer;font-weight:600;font-size:.88rem;color:var(--muted)}
.kbd{font-family:var(--mono);font-size:.78rem;background:#eef2f5;padding:1px 6px;border-radius:4px}
.ret-table td:first-child{width:46px;color:var(--muted)}.ret-table .m input{width:130px;padding:4px 6px;text-align:right}
.print-only{display:none}
@media print{.sidebar,.topbar,.no-print{display:none!important}.content{padding:0}.card{box-shadow:none;border:0}}

/* ---------- public site ---------- */
.site{background:#fff;color:var(--text)}
.site .wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.site header.top{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);z-index:10}
.site header.top .wrap{display:flex;align-items:center;justify-content:space-between;height:62px;gap:16px}
.site nav.links{display:flex;gap:18px;align-items:center;font-size:.92rem}.site nav.links a{color:var(--text)}.site nav.links a:hover{text-decoration:none;color:var(--accent)}
.site .brand{padding:0;color:var(--text);font-size:1.15rem}
.hero{padding:72px 0 40px;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero h1{font-size:2.6rem;line-height:1.18;margin-bottom:14px;letter-spacing:-.02em}
.hero .lead{font-size:1.12rem;color:var(--muted);max-width:56ch}
.hero .eyebrow{display:inline-block;background:var(--accent-soft);color:var(--accent-2);font-weight:600;font-size:.8rem;padding:4px 10px;border-radius:999px;margin-bottom:14px}
.hero .cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.hero .cta .btn{padding:12px 20px;font-size:1rem}
.hero .trust{margin-top:16px;font-size:.84rem;color:var(--faint)}
.sheet-mock{background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 20px 50px -24px rgba(16,24,40,.35);padding:18px 20px;font-family:"Noto Sans Bengali",sans-serif;font-size:.72rem;line-height:1.4;position:relative;transform:rotate(-1.2deg)}
.sheet-mock .sh{text-align:center;font-weight:700}.sheet-mock .fn{position:absolute;right:14px;top:12px;border:1px solid #000;padding:0 6px;font-weight:700}
.sheet-mock .rr{display:flex;gap:6px;margin-top:3px}.sheet-mock .rr span:last-child{flex:1;border-bottom:1px dotted #777;font-weight:600}
.sheet-mock table{margin-top:8px;font-size:.66rem}.sheet-mock th,.sheet-mock td{border:1px solid #333;padding:2px 4px;background:#fff;color:#000;font-weight:500;text-transform:none;letter-spacing:0}.sheet-mock th{background:#f1f1f1;font-size:.6rem}
.sheet-mock .qrm{position:absolute;right:18px;bottom:16px;width:62px;height:62px;background:conic-gradient(from 0deg,#111 0 25%,#fff 0 50%,#111 0 75%,#fff 0);border:3px solid #111;opacity:.9;border-radius:3px}
.sheet-mock .stampv{position:absolute;left:18px;bottom:22px;border:2px solid #0b6b4f;color:#0b6b4f;font-weight:700;padding:2px 8px;transform:rotate(-8deg);font-size:.8rem;background:#fff}
.section{padding:48px 0}.section h2{font-size:1.7rem;margin-bottom:8px;letter-spacing:-.01em}.section .sub{color:var(--muted);max-width:64ch;margin-bottom:24px}
.feat{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feat .f{border:1px solid var(--border);border-radius:12px;padding:18px;background:var(--surface)}.feat .f .ic{width:36px;height:36px;border-radius:9px;background:var(--accent-soft);color:var(--accent-2);display:flex;align-items:center;justify-content:center;font-weight:800;margin-bottom:10px}.feat h3{font-size:1rem;margin-bottom:4px}.feat p{color:var(--muted);font-size:.9rem;margin:0}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;counter-reset:s}.steps .s{padding:18px;border-radius:12px;background:var(--surface-2);border:1px solid var(--border)}.steps .s::before{counter-increment:s;content:counter(s);display:inline-flex;width:28px;height:28px;border-radius:50%;background:var(--accent);color:#fff;align-items:center;justify-content:center;font-weight:700;margin-bottom:8px}.steps h3{font-size:1rem}.steps p{color:var(--muted);font-size:.9rem;margin:0}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;align-items:stretch}.plan{border:1px solid var(--border);border-radius:14px;padding:22px;background:#fff;display:flex;flex-direction:column}.plan.hi{border-color:var(--accent);box-shadow:0 10px 30px -18px rgba(15,118,110,.5);position:relative}.plan.hi .tag{position:absolute;top:-12px;left:20px;background:var(--accent);color:#fff;font-size:.74rem;font-weight:700;padding:3px 10px;border-radius:999px}
.plan .pr{font-size:2rem;font-weight:800;margin:6px 0 2px}.plan .pr small{font-size:.9rem;font-weight:500;color:var(--muted)}.plan ul{padding-left:18px;margin:12px 0 18px;color:var(--text);font-size:.92rem;line-height:1.7;flex:1}.plan .btn{align-self:flex-start}
.faq details{border-bottom:1px solid var(--border);padding:12px 0}.faq summary{font-weight:600;cursor:pointer;font-size:1rem}.faq p{color:var(--muted);margin:8px 0 0}
.site footer{border-top:1px solid var(--border);padding:28px 0;font-size:.86rem;color:var(--muted)}.site footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
.prose{max-width:76ch;line-height:1.65}.prose h2{margin-top:28px;font-size:1.25rem}.prose h3{margin-top:18px}.prose p,.prose li{color:var(--text)}.prose .muted{color:var(--muted)}
.band{background:#0b1f24;color:#cfe3e0;padding:40px 0;border-radius:16px;margin:24px 0}.band h2{color:#fff}.band .btn{background:#14b8a6;border-color:#14b8a6;color:#062a26}
@media(max-width:900px){.hero{grid-template-columns:1fr;padding-top:36px}.hero h1{font-size:2rem}.feat,.steps,.plans{grid-template-columns:1fr}.site nav.links{gap:10px;flex-wrap:wrap}}
.checklist li{display:flex;gap:10px;align-items:center;padding:6px 0}.checklist .dot{width:20px;height:20px;border-radius:50%;border:2px solid var(--border);display:inline-flex;align-items:center;justify-content:center;font-size:.7rem;color:#fff}.checklist .done .dot{background:var(--ok);border-color:var(--ok)}.checklist .done span{color:var(--muted);text-decoration:line-through}