:root{
  --ink:#1b2430; --muted:#667085; --line:#e3e8ef; --bg:#f4f6fa; --card:#fff;
  --brand:#1f4e79; --brand2:#2f6fb0; --soft:#eaf1f8; --ok:#16794c; --warn:#b45309; --bad:#c0392b; --radius:10px;
  --font:'Sarabun',Tahoma,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 var(--font)}
h1,h2,h3,h4{margin:0}
a{color:var(--brand2);text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
[hidden]{display:none!important}

/* ---------- shell ---------- */
.app{display:grid;grid-template-columns:230px minmax(0,1fr);min-height:100vh}
.side{background:#fff;border-right:1px solid var(--line);padding:18px 12px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:4px}
.brand{font-weight:700;font-size:18px;color:var(--brand);padding:4px 10px 14px;display:flex;align-items:center;gap:8px}
.brand i{width:28px;height:28px;border-radius:8px;background:var(--brand);display:inline-block}
.nav a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;color:var(--ink);font-weight:500}
.nav a svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.nav a:hover{background:var(--bg)}
.nav a.on{background:var(--soft);color:var(--brand)}
.side .who{margin-top:auto;padding:10px;font-size:13px;color:var(--muted);border-top:1px solid var(--line);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
main{padding:24px clamp(14px,3vw,36px) 48px;min-width:0}
.page-head{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-bottom:18px}
.page-head h2{font-size:22px}
.sub{color:var(--muted);font-size:13.5px}

@media (max-width:820px){
  .app{display:block}
  .side{position:fixed;bottom:0;left:0;right:0;top:auto;height:auto;flex-direction:row;padding:4px 6px calc(4px + env(safe-area-inset-bottom));z-index:30;border-top:1px solid var(--line);border-right:0}
  .brand,.side .who{display:none}
  .nav{display:flex;flex:1;justify-content:space-around}
  .nav a{flex-direction:column;gap:1px;padding:6px 4px;font-size:11px;min-width:0}
  main{padding-bottom:88px}
}

/* ---------- controls ---------- */
.btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 14px;cursor:pointer;font-weight:500;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.btn:hover{background:var(--bg)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:#18405f}
.btn.danger{background:var(--bad);border-color:var(--bad);color:#fff}
.btn.ghost{border-color:transparent;background:transparent}
.btn.sm{padding:4px 10px;font-size:13px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn.icon{padding:4px 8px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.card+.card{margin-top:14px}
.card h3{font-size:15.5px;margin-bottom:12px;color:var(--brand)}
.grid{display:grid;gap:12px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr}.g4.keep{grid-template-columns:repeat(2,1fr)}}
.f{display:flex;flex-direction:column;gap:4px;min-width:0}
.f>span,.f>label{font-size:13px;color:var(--muted);font-weight:500}
input[type=text],input[type=email],input[type=password],input[type=date],input[type=number],input[type=search],select,textarea{
  width:100%;border:1px solid #cfd6e0;border-radius:8px;padding:8px 10px;background:#fff;min-width:0}
textarea{resize:vertical;min-height:38px}
input:focus,select:focus,textarea:focus{outline:2px solid #9cc1e6;border-color:var(--brand2)}
input[type=color]{width:46px;height:36px;padding:2px;border:1px solid #cfd6e0;border-radius:8px;background:#fff}
.chk{display:flex;align-items:center;gap:8px;font-size:14px;cursor:pointer}
.chk input{width:17px;height:17px;accent-color:var(--brand)}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.spacer{flex:1}
.err{color:var(--bad);font-size:13.5px}
.empty{padding:36px 12px;text-align:center;color:var(--muted)}

.badge{display:inline-block;padding:1px 10px;border-radius:99px;font-size:12.5px;font-weight:600;background:#eef1f5;color:#475467}
.badge.sent{background:#e0edff;color:#1d4ed8}
.badge.accepted{background:#dcf5e7;color:var(--ok)}
.badge.rejected{background:#fde8e6;color:var(--bad)}
select.status{width:auto;padding:3px 8px;font-size:13px;font-weight:600;border-radius:99px}

/* ---------- tables / lists ---------- */
.tbl{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.tbl th{background:#f8fafc;text-align:left;font-size:13px;color:var(--muted);padding:9px 12px;font-weight:600}
.tbl td{padding:10px 12px;border-top:1px solid var(--line);vertical-align:middle}
.tbl td.r,.tbl th.r{text-align:right}
.tbl tr:hover td{background:#fafcff}
.tbl .act{white-space:nowrap;text-align:right}
@media (max-width:760px){
  .tbl,.tbl tbody,.tbl tr,.tbl td{display:block;width:100%}
  .tbl thead{display:none}
  .tbl tr{border-top:1px solid var(--line);padding:10px 12px}
  .tbl td{border:0;padding:2px 0}
  .tbl td.act{text-align:left;padding-top:6px}
  .tbl td.r{text-align:left}
}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:16px}
@media (max-width:760px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px}
.stat b{display:block;font-size:26px;color:var(--brand);line-height:1.2}
.stat span{font-size:13px;color:var(--muted)}

.split{display:grid;grid-template-columns:260px minmax(0,1fr);gap:16px;align-items:start}
@media (max-width:900px){.split{grid-template-columns:1fr}}
.list{display:flex;flex-direction:column;gap:6px}
.list button{text-align:left;border:1px solid var(--line);background:#fff;border-radius:8px;padding:9px 12px;cursor:pointer;display:flex;justify-content:space-between;gap:8px}
.list button.on{border-color:var(--brand2);background:var(--soft)}
.list small{color:var(--muted)}
.banner{background:var(--soft);border:1px solid #c5d9ec;border-radius:var(--radius);padding:12px 16px;margin-bottom:16px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:14px}
.tabs button{border:0;background:none;padding:8px 14px;cursor:pointer;border-bottom:2px solid transparent;font-weight:600;color:var(--muted)}
.tabs button.on{color:var(--brand);border-color:var(--brand)}

/* ---------- modal / toast ---------- */
dialog.modal{border:0;border-radius:12px;padding:0;width:min(480px,calc(100vw - 24px));box-shadow:0 20px 60px rgba(16,24,40,.3)}
dialog.modal.wide{width:min(640px,calc(100vw - 24px))}
dialog.modal::backdrop{background:rgba(16,24,40,.45)}
dialog.modal form{padding:20px}
dialog.modal h3{margin-bottom:14px;font-size:18px}
.modal-body{display:grid;gap:10px}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}
.form-err{color:var(--bad);margin:10px 0 0;font-size:14px}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:#1b2430;color:#fff;padding:10px 18px;border-radius:99px;z-index:100;box-shadow:0 6px 20px rgba(0,0,0,.25);transition:opacity .4s}
.toast.err{background:var(--bad)}
.toast.out{opacity:0}

/* ---------- auth ---------- */
.auth{min-height:100vh;display:grid;place-items:center;padding:16px}
.auth .card{width:min(420px,100%);padding:28px}
.auth h1{font-size:24px;color:var(--brand);margin-bottom:4px}

/* ---------- editor ---------- */
.editor{display:grid;grid-template-columns:minmax(360px,520px) minmax(0,1fr);gap:16px;align-items:start}
.pane-preview{position:sticky;top:12px}
.editor-tabs{display:none}
@media (max-width:1150px){
  .editor{grid-template-columns:1fr}
  .editor-tabs{display:flex}
  .editor .pane-preview{display:none;position:static}
  .editor.show-preview .pane-form{display:none}
  .editor.show-preview .pane-preview{display:block}
}
.items{display:flex;flex-direction:column;gap:8px}
.item{border:1px solid var(--line);border-radius:8px;padding:8px;background:#fcfdff;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:6px 8px}
.item.drag-over{outline:2px dashed var(--brand2)}
.item.dragging{opacity:.4}
.item .handle{cursor:grab;color:var(--muted);user-select:none;padding:4px;font-size:18px;line-height:1}
.item .nums{grid-column:2/3;display:grid;grid-template-columns:70px 70px 1fr;gap:6px;align-items:center}
.item .amt{grid-column:2/3;text-align:right;font-weight:600;white-space:nowrap}
.item .side-btns{display:flex;flex-direction:column;gap:2px}
.paper-wrap{overflow:hidden;background:#d9dee6;border-radius:var(--radius);padding:10px}
.paper-scale{transform-origin:top left;width:210mm}
.preview-bar{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}
.sticky-save{position:sticky;bottom:0;background:linear-gradient(transparent,var(--bg) 30%);padding:14px 0 4px;display:flex;gap:8px;justify-content:flex-end;z-index:5}
.totals-mini{display:grid;grid-template-columns:1fr auto;gap:2px 16px;font-size:14px}
.totals-mini b{text-align:right}
.bank-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) auto;gap:6px;align-items:end;margin-bottom:8px}
@media (max-width:700px){.bank-row{grid-template-columns:1fr 1fr}}
.logo-prev{max-height:64px;max-width:160px;border:1px solid var(--line);border-radius:6px;padding:4px;background:#fff}

/* ---------- เอกสาร A4 (ตัวอย่าง/พิมพ์/PDF) ---------- */
.paper{width:210mm;min-height:297mm;background:#fff;padding:15mm;box-shadow:0 2px 10px rgba(0,0,0,.18)}
.qd{color:#1b1f24;font-size:13.5px;line-height:1.5}
.qd .lbl{color:#5b6470}
.qd .pend{color:#8a93a0;font-style:italic}
.qd .txt{white-space:pre-wrap}
.qd-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}
.qd-seller{display:flex;gap:12px;align-items:flex-start}
.qd-logo{max-width:86px;max-height:86px;object-fit:contain}
.qd-name{font-size:19px;font-weight:700;color:var(--accent)}
.qd-title{text-align:right}
.qd-title h1{font-size:26px;color:var(--accent);letter-spacing:.5px;white-space:nowrap}
.qd-title .en{color:#5b6470;font-size:13px;letter-spacing:2px}
.qd-info{display:grid;grid-template-columns:1fr 215px;gap:12px;margin-top:14px;border:1px solid #c9cfd6;border-radius:6px;padding:9px 12px}
.qd-info .row{display:flex;gap:6px;margin:2px 0;flex-wrap:nowrap;align-items:flex-start}
.qd-info .row .lbl{flex:0 0 auto;min-width:56px}
.qd-info>div:first-child .row .lbl{min-width:118px}
.qd-info .right{border-left:1px solid #c9cfd6;padding-left:12px}
.qd-subject{margin-top:10px;font-weight:600}
.qd-items{width:100%;border-collapse:collapse;margin-top:12px}
.qd-items th{background:var(--accent);color:#fff;font-weight:600;padding:6px;font-size:13px;-webkit-print-color-adjust:exact;print-color-adjust:exact}
.qd-items td{border-bottom:1px solid #c9cfd6;padding:6px;vertical-align:top}
.qd-items td.c{text-align:center}.qd-items td.r{text-align:right;white-space:nowrap}
.qd-items td.desc{white-space:pre-wrap;overflow-wrap:anywhere}
.qd-items tr{break-inside:avoid}
.qd-totals{display:flex;justify-content:space-between;gap:16px;margin-top:10px;break-inside:avoid}
.qd .words{flex:1;align-self:flex-end;background:#eef3f8;border-radius:6px;padding:8px 12px;font-weight:600;text-align:center;-webkit-print-color-adjust:exact;print-color-adjust:exact}
.qd .sum{width:300px;border-collapse:collapse;flex:none}
.qd .sum td{padding:3px 6px}.qd .sum td:last-child{text-align:right;white-space:nowrap}
.qd .sum tr.grand td{border-top:2px solid var(--accent);border-bottom:2px solid var(--accent);font-weight:700;font-size:14.5px;color:var(--accent)}
.qd .sum tr.net td{font-weight:700}
.qd-pending-note{margin-top:6px;font-size:12px;color:#5b6470}
.qd-terms{margin-top:14px}
.qd-term{margin-bottom:8px;break-inside:avoid}
.qd-term h4,.qd-bank h4{font-size:13.5px;color:var(--accent);margin-bottom:1px}
.qd-bank{margin-top:10px;border:1px solid #c9cfd6;border-radius:6px;padding:8px 12px;break-inside:avoid}
.qd-footer{margin-top:14px;font-size:12.5px;color:#5b6470;white-space:pre-wrap;text-align:center}
.qd-signs{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:30px;text-align:center;break-inside:avoid}
.qd-signs .ln{margin-top:38px}.qd-signs .sm{color:#5b6470;font-size:12.5px}
.qd-signs>div>.sm:first-child{min-height:38px}

#print-root{display:none}
@media print{
  @page{size:A4;margin:14mm 15mm}
  body{background:#fff}
  body>*:not(#print-root){display:none!important}
  #print-root{display:block}
  #print-root .qd{padding:0}
  .toast{display:none}
}