:root{
  --red:#b5122b; --red-dark:#8f0d21; --red-soft:#fbeaec; --ink:#1c1c1e; --ink2:#5b5b63; --line:#e4e2e3;
  --bg:#f6f4f3; --card:#fff; --ok:#1d7a46; --ok-soft:#e6f4ec; --warn:#a65f00; --warn-soft:#fff3e0; --radius:10px;
  font-family:Inter,"Noto Sans Lao",system-ui,sans-serif; color:var(--ink); font-size:15px;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg)}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3{margin:0 0 12px;line-height:1.25} h1{font-size:22px} h2{font-size:18px} h3{font-size:15px}
a{color:var(--red)}
.muted{color:var(--ink2)} .small{font-size:13px} .right{text-align:right} .nowrap{white-space:nowrap}
.num{font-variant-numeric:tabular-nums}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap} .grow{flex:1} .col{display:flex;flex-direction:column;gap:8px}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}

/* top bar */
.top{display:flex;align-items:center;gap:14px;padding:8px 16px;background:#fff;border-bottom:3px solid var(--red);position:sticky;top:0;z-index:5}
.top img{height:38px}
.top .brand{font-weight:700;line-height:1.1}.top .brand small{display:block;color:var(--red);font-weight:500;font-size:12px}
.top .spacer{flex:1}
.pill{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border-radius:99px;background:#f0eeee;font-size:12.5px;white-space:nowrap}
.pill.red{background:var(--red);color:#fff}.pill.ok{background:var(--ok-soft);color:var(--ok)}.pill.warn{background:var(--warn-soft);color:var(--warn)}

.layout{display:flex;min-height:calc(100vh - 58px)}
nav.side{width:190px;background:var(--ink);padding:10px 8px;flex-shrink:0}
nav.side a{display:flex;align-items:center;justify-content:space-between;color:#eee;text-decoration:none;padding:10px 12px;border-radius:8px;margin-bottom:2px}
nav.side a.on{background:var(--red);color:#fff} nav.side a:hover:not(.on){background:#2e2e31}
nav.side .badge{background:#fff;color:var(--red);border-radius:99px;font-size:11px;padding:1px 7px;font-weight:700}
main{flex:1;padding:18px;min-width:0}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin-bottom:14px}
.btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:9px 14px;cursor:pointer;font-weight:500}
.btn:hover{border-color:#bbb}.btn.primary{background:var(--red);border-color:var(--red);color:#fff}.btn.primary:hover{background:var(--red-dark)}
.btn.dark{background:var(--ink);border-color:var(--ink);color:#fff}.btn.ok{background:var(--ok);border-color:var(--ok);color:#fff}
.btn.big{padding:14px 18px;font-size:17px;font-weight:700}.btn.sm{padding:5px 10px;font-size:13px}.btn.link{border:0;background:none;color:var(--red);padding:4px}
.btn:disabled{opacity:.45;cursor:not-allowed}
label{font-size:12.5px;color:var(--ink2);display:block;margin-bottom:3px}
input,select,textarea{width:100%;padding:9px 10px;border:1px solid #d6d3d4;border-radius:8px;background:#fff}
input:focus,select:focus,textarea:focus{outline:2px solid var(--red-soft);border-color:var(--red)}
input[type=checkbox]{width:auto}
.field{margin-bottom:10px}

table{width:100%;border-collapse:collapse}
th,td{padding:8px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{font-size:12px;color:var(--ink2);font-weight:600;text-transform:uppercase;letter-spacing:.03em}
tr.click{cursor:pointer} tr.click:hover td{background:#faf7f7}
td.num,th.num{text-align:right}
.tablewrap{overflow-x:auto}

/* sell screen */
.sell{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(360px,1fr);gap:16px;align-items:start}
.search-big{font-size:18px;padding:13px 14px}
.prod{display:flex;justify-content:space-between;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;margin-bottom:6px;background:#fff;cursor:pointer}
.prod:hover{border-color:var(--red)} .prod .nm{font-weight:600}
.cart-line{display:grid;grid-template-columns:1fr auto;gap:6px;padding:10px 0;border-bottom:1px dashed var(--line)}
.qty{display:flex;align-items:center;gap:4px}.qty button{width:30px;height:30px;padding:0;border-radius:6px}
.qty input{width:56px;text-align:center;padding:5px}
.price-in{width:92px;text-align:right;padding:5px}
.total-box{background:var(--ink);color:#fff;border-radius:var(--radius);padding:14px 16px;margin-top:12px}
.total-box .big{font-size:30px;font-weight:700}
.total-box .fx{display:flex;gap:14px;flex-wrap:wrap;color:#ccc;font-size:13.5px;margin-top:4px}
.warnbox{background:var(--warn-soft);color:var(--warn);border-radius:8px;padding:10px 12px;margin:8px 0;font-size:14px}
.okbox{background:var(--ok-soft);color:var(--ok);border-radius:8px;padding:10px 12px;margin:8px 0}
.redbox{background:var(--red-soft);color:var(--red-dark);border-radius:8px;padding:10px 12px;margin:8px 0}
.tag{display:inline-block;font-size:11.5px;border-radius:5px;padding:1px 6px;background:#eee;margin-left:4px}
.tag.red{background:var(--red-soft);color:var(--red-dark)}.tag.ok{background:var(--ok-soft);color:var(--ok)}.tag.warn{background:var(--warn-soft);color:var(--warn)}

/* modal */
.modal-bg{position:fixed;inset:0;background:rgba(20,20,22,.5);display:flex;align-items:flex-start;justify-content:center;padding:4vh 12px;z-index:20;overflow:auto}
.modal{background:#fff;border-radius:12px;width:min(640px,100%);padding:20px;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.modal.wide{width:min(900px,100%)}
.modal .foot{display:flex;gap:8px;justify-content:flex-end;margin-top:16px;flex-wrap:wrap}
#toast{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);z-index:40}
#toast div{background:var(--ink);color:#fff;padding:10px 16px;border-radius:8px;margin-top:6px;box-shadow:0 6px 20px rgba(0,0,0,.2)}
#toast div.err{background:var(--red)}

.login{max-width:380px;margin:8vh auto;padding:28px;background:#fff;border-radius:14px;border:1px solid var(--line);text-align:center}
.login img{width:220px;margin-bottom:10px}
.tabs{display:flex;gap:6px;margin-bottom:14px;flex-wrap:wrap}
.tabs button{border:1px solid var(--line);background:#fff;border-radius:99px;padding:6px 14px;cursor:pointer}
.tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-bottom:14px}
.kpi{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px}
.kpi b{display:block;font-size:22px;margin-top:2px}
.pay-row{display:grid;grid-template-columns:1fr 150px 34px;gap:8px;margin-bottom:8px;align-items:center}
.quick{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 12px}
.quick button{font-size:12.5px;padding:5px 9px}

@media (max-width:900px){
  .sell{grid-template-columns:1fr}
  nav.side{position:fixed;bottom:0;left:0;right:0;width:auto;display:flex;overflow-x:auto;padding:4px;z-index:6}
  nav.side a{flex-direction:column;font-size:11.5px;padding:8px 10px;white-space:nowrap}
  main{padding:12px 12px 80px}
  .top .hide-sm{display:none}
}

/* printing */
#print{display:none}
@media print{
  body *{visibility:hidden}
  #print,#print *{visibility:visible}
  #print{display:block;position:absolute;left:0;top:0;width:100%}
  @page{margin:8mm}
}
.rcpt{width:72mm;font-size:12px;font-family:Inter,"Noto Sans Lao",sans-serif;color:#000}
.rcpt img{width:42mm;display:block;margin:0 auto 4px}
.rcpt .c{text-align:center}.rcpt table td{padding:2px 0;border:0}.rcpt hr{border:0;border-top:1px dashed #000;margin:6px 0}
.a4{width:190mm;font-size:12.5px;color:#000;font-family:Inter,"Noto Sans Lao",sans-serif}
.a4 .head{display:flex;justify-content:space-between;align-items:flex-start;border-bottom:3px solid var(--red);padding-bottom:8px;margin-bottom:12px}
.a4 .head img{height:70px}
.a4 table th,.a4 table td{border-bottom:1px solid #ccc;padding:5px}
.a4 .sign{display:flex;justify-content:space-between;margin-top:50px}
.a4 .sign div{width:45%;border-top:1px solid #000;padding-top:4px;text-align:center}
.a4 .paid{color:var(--red);border:3px solid var(--red);display:inline-block;padding:4px 14px;font-size:22px;font-weight:800;transform:rotate(-8deg)}